[SCSI] cxgb3i: Add cxgb3i iSCSI driver.
This patch implements the cxgb3i iscsi connection acceleration for the open-iscsi initiator. The cxgb3i driver offers the iscsi PDU based offload: - digest insertion and verification - payload direct-placement into host memory buffer. Signed-off-by: Karen Xie <kxie@chelsio.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Karen Xie
James Bottomley
parent
b632ade282
commit
c3673464eb
14 changed files with 4873 additions and 0 deletions
85
Documentation/scsi/cxgb3i.txt
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85
Documentation/scsi/cxgb3i.txt
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@ -0,0 +1,85 @@
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Chelsio S3 iSCSI Driver for Linux
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Introduction
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============
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The Chelsio T3 ASIC based Adapters (S310, S320, S302, S304, Mezz cards, etc.
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series of products) supports iSCSI acceleration and iSCSI Direct Data Placement
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(DDP) where the hardware handles the expensive byte touching operations, such
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as CRC computation and verification, and direct DMA to the final host memory
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destination:
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- iSCSI PDU digest generation and verification
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On transmitting, Chelsio S3 h/w computes and inserts the Header and
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Data digest into the PDUs.
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On receiving, Chelsio S3 h/w computes and verifies the Header and
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Data digest of the PDUs.
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- Direct Data Placement (DDP)
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S3 h/w can directly place the iSCSI Data-In or Data-Out PDU's
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payload into pre-posted final destination host-memory buffers based
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on the Initiator Task Tag (ITT) in Data-In or Target Task Tag (TTT)
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in Data-Out PDUs.
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- PDU Transmit and Recovery
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On transmitting, S3 h/w accepts the complete PDU (header + data)
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from the host driver, computes and inserts the digests, decomposes
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the PDU into multiple TCP segments if necessary, and transmit all
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the TCP segments onto the wire. It handles TCP retransmission if
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needed.
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On receving, S3 h/w recovers the iSCSI PDU by reassembling TCP
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segments, separating the header and data, calculating and verifying
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the digests, then forwards the header to the host. The payload data,
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if possible, will be directly placed into the pre-posted host DDP
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buffer. Otherwise, the payload data will be sent to the host too.
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The cxgb3i driver interfaces with open-iscsi initiator and provides the iSCSI
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acceleration through Chelsio hardware wherever applicable.
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Using the cxgb3i Driver
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=======================
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The following steps need to be taken to accelerates the open-iscsi initiator:
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1. Load the cxgb3i driver: "modprobe cxgb3i"
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The cxgb3i module registers a new transport class "cxgb3i" with open-iscsi.
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* in the case of recompiling the kernel, the cxgb3i selection is located at
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Device Drivers
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SCSI device support --->
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[*] SCSI low-level drivers --->
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<M> Chelsio S3xx iSCSI support
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2. Create an interface file located under /etc/iscsi/ifaces/ for the new
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transport class "cxgb3i".
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The content of the file should be in the following format:
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iface.transport_name = cxgb3i
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iface.net_ifacename = <ethX>
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iface.ipaddress = <iscsi ip address>
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* if iface.ipaddress is specified, <iscsi ip address> needs to be either the
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same as the ethX's ip address or an address on the same subnet. Make
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sure the ip address is unique in the network.
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3. edit /etc/iscsi/iscsid.conf
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The default setting for MaxRecvDataSegmentLength (131072) is too big,
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replace "node.conn[0].iscsi.MaxRecvDataSegmentLength" to be a value no
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bigger than 15360 (for example 8192):
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node.conn[0].iscsi.MaxRecvDataSegmentLength = 8192
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* The login would fail for a normal session if MaxRecvDataSegmentLength is
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too big. A error message in the format of
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"cxgb3i: ERR! MaxRecvSegmentLength <X> too big. Need to be <= <Y>."
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would be logged to dmesg.
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4. To direct open-iscsi traffic to go through cxgb3i's accelerated path,
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"-I <iface file name>" option needs to be specified with most of the
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iscsiadm command. <iface file name> is the transport interface file created
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in step 2.
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@ -352,6 +352,8 @@ config ISCSI_TCP
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http://open-iscsi.org
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source "drivers/scsi/cxgb3i/Kconfig"
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config SGIWD93_SCSI
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tristate "SGI WD93C93 SCSI Driver"
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depends on SGI_HAS_WD93 && SCSI
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@ -126,6 +126,7 @@ obj-$(CONFIG_SCSI_HPTIOP) += hptiop.o
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obj-$(CONFIG_SCSI_STEX) += stex.o
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obj-$(CONFIG_SCSI_MVSAS) += mvsas.o
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obj-$(CONFIG_PS3_ROM) += ps3rom.o
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obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgb3i/
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obj-$(CONFIG_ARM) += arm/
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4
drivers/scsi/cxgb3i/Kbuild
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4
drivers/scsi/cxgb3i/Kbuild
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@ -0,0 +1,4 @@
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EXTRA_CFLAGS += -I$(TOPDIR)/drivers/net/cxgb3
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cxgb3i-y := cxgb3i_init.o cxgb3i_iscsi.o cxgb3i_pdu.o cxgb3i_offload.o
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obj-$(CONFIG_SCSI_CXGB3_ISCSI) += cxgb3i_ddp.o cxgb3i.o
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6
drivers/scsi/cxgb3i/Kconfig
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6
drivers/scsi/cxgb3i/Kconfig
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@ -0,0 +1,6 @@
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config SCSI_CXGB3_ISCSI
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tristate "Chelsio S3xx iSCSI support"
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select CHELSIO_T3
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select SCSI_ISCSI_ATTRS
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---help---
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This driver supports iSCSI offload for the Chelsio S3 series devices.
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139
drivers/scsi/cxgb3i/cxgb3i.h
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139
drivers/scsi/cxgb3i/cxgb3i.h
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@ -0,0 +1,139 @@
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/*
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* cxgb3i.h: Chelsio S3xx iSCSI driver.
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*
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* Copyright (c) 2008 Chelsio Communications, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*
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* Written by: Karen Xie (kxie@chelsio.com)
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*/
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#ifndef __CXGB3I_H__
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#define __CXGB3I_H__
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/scatterlist.h>
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#include <scsi/libiscsi_tcp.h>
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/* from cxgb3 LLD */
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#include "common.h"
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#include "t3_cpl.h"
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#include "t3cdev.h"
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#include "cxgb3_ctl_defs.h"
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#include "cxgb3_offload.h"
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#include "firmware_exports.h"
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#include "cxgb3i_offload.h"
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#include "cxgb3i_ddp.h"
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#define CXGB3I_SCSI_QDEPTH_DFLT 128
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#define CXGB3I_MAX_TARGET CXGB3I_MAX_CONN
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#define CXGB3I_MAX_LUN 512
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#define ISCSI_PDU_NONPAYLOAD_MAX \
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(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
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struct cxgb3i_adapter;
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struct cxgb3i_hba;
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struct cxgb3i_endpoint;
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/**
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* struct cxgb3i_hba - cxgb3i iscsi structure (per port)
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*
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* @snic: cxgb3i adapter containing this port
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* @ndev: pointer to netdev structure
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* @shost: pointer to scsi host structure
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*/
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struct cxgb3i_hba {
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struct cxgb3i_adapter *snic;
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struct net_device *ndev;
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struct Scsi_Host *shost;
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};
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/**
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* struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
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*
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* @listhead: list head to link elements
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* @lock: lock for this structure
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* @tdev: pointer to t3cdev used by cxgb3 driver
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* @pdev: pointer to pci dev
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* @hba_cnt: # of hbas (the same as # of ports)
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* @hba: all the hbas on this adapter
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* @tx_max_size: max. tx packet size supported
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* @rx_max_size: max. rx packet size supported
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* @tag_format: ddp tag format settings
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*/
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struct cxgb3i_adapter {
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struct list_head list_head;
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spinlock_t lock;
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struct t3cdev *tdev;
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struct pci_dev *pdev;
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unsigned char hba_cnt;
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struct cxgb3i_hba *hba[MAX_NPORTS];
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unsigned int tx_max_size;
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unsigned int rx_max_size;
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struct cxgb3i_tag_format tag_format;
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};
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/**
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* struct cxgb3i_conn - cxgb3i iscsi connection
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*
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* @listhead: list head to link elements
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* @cep: pointer to iscsi_endpoint structure
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* @conn: pointer to iscsi_conn structure
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* @hba: pointer to the hba this conn. is going through
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* @task_idx_bits: # of bits needed for session->cmds_max
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*/
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struct cxgb3i_conn {
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struct list_head list_head;
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struct cxgb3i_endpoint *cep;
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struct iscsi_conn *conn;
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struct cxgb3i_hba *hba;
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unsigned int task_idx_bits;
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};
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/**
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* struct cxgb3i_endpoint - iscsi tcp endpoint
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*
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* @c3cn: the h/w tcp connection representation
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* @hba: pointer to the hba this conn. is going through
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* @cconn: pointer to the associated cxgb3i iscsi connection
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*/
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struct cxgb3i_endpoint {
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struct s3_conn *c3cn;
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struct cxgb3i_hba *hba;
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struct cxgb3i_conn *cconn;
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};
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int cxgb3i_iscsi_init(void);
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void cxgb3i_iscsi_cleanup(void);
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struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *);
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void cxgb3i_adapter_remove(struct t3cdev *);
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int cxgb3i_adapter_ulp_init(struct cxgb3i_adapter *);
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void cxgb3i_adapter_ulp_cleanup(struct cxgb3i_adapter *);
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struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *);
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struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
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struct net_device *);
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void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
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int cxgb3i_pdu_init(void);
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void cxgb3i_pdu_cleanup(void);
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void cxgb3i_conn_cleanup_task(struct iscsi_task *);
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int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
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int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
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int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
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void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
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int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
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#endif
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770
drivers/scsi/cxgb3i/cxgb3i_ddp.c
Normal file
770
drivers/scsi/cxgb3i/cxgb3i_ddp.c
Normal file
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@ -0,0 +1,770 @@
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/*
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* cxgb3i_ddp.c: Chelsio S3xx iSCSI DDP Manager.
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*
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* Copyright (c) 2008 Chelsio Communications, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*
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* Written by: Karen Xie (kxie@chelsio.com)
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*/
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#include <linux/skbuff.h>
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/* from cxgb3 LLD */
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#include "common.h"
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#include "t3_cpl.h"
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#include "t3cdev.h"
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#include "cxgb3_ctl_defs.h"
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#include "cxgb3_offload.h"
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#include "firmware_exports.h"
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#include "cxgb3i_ddp.h"
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#define DRV_MODULE_NAME "cxgb3i_ddp"
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#define DRV_MODULE_VERSION "1.0.0"
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#define DRV_MODULE_RELDATE "Dec. 1, 2008"
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static char version[] =
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"Chelsio S3xx iSCSI DDP " DRV_MODULE_NAME
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" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
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MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
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MODULE_DESCRIPTION("cxgb3i ddp pagepod manager");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_MODULE_VERSION);
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#define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
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#define ddp_log_warn(fmt...) printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
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#define ddp_log_info(fmt...) printk(KERN_INFO "cxgb3i_ddp: " fmt)
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#ifdef __DEBUG_CXGB3I_DDP__
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#define ddp_log_debug(fmt, args...) \
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printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
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#else
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#define ddp_log_debug(fmt...)
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#endif
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/*
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* iSCSI Direct Data Placement
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*
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* T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
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* pre-posted final destination host-memory buffers based on the Initiator
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* Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
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*
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* The host memory address is programmed into h/w in the format of pagepod
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* entries.
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* The location of the pagepod entry is encoded into ddp tag which is used or
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* is the base for ITT/TTT.
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*/
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#define DDP_PGIDX_MAX 4
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#define DDP_THRESHOLD 2048
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static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
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static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
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static unsigned char page_idx = DDP_PGIDX_MAX;
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static LIST_HEAD(cxgb3i_ddp_list);
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static DEFINE_RWLOCK(cxgb3i_ddp_rwlock);
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/*
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* functions to program the pagepod in h/w
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*/
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static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
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{
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struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
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req->wr.wr_lo = 0;
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req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
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req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
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V_ULPTX_CMD(ULP_MEM_WRITE));
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req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
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V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
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}
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static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
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unsigned int idx, unsigned int npods,
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struct cxgb3i_gather_list *gl)
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{
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unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
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int i;
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for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
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struct sk_buff *skb = ddp->gl_skb[idx];
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struct pagepod *ppod;
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int j, pidx;
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/* hold on to the skb until we clear the ddp mapping */
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skb_get(skb);
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ulp_mem_io_set_hdr(skb, pm_addr);
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ppod = (struct pagepod *)
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(skb->head + sizeof(struct ulp_mem_io));
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memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
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for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
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ppod->addr[j] = pidx < gl->nelem ?
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cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
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skb->priority = CPL_PRIORITY_CONTROL;
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cxgb3_ofld_send(ddp->tdev, skb);
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}
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return 0;
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}
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static int clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int idx,
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unsigned int npods)
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{
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unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
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int i;
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for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
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struct sk_buff *skb = ddp->gl_skb[idx];
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ddp->gl_skb[idx] = NULL;
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memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
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ulp_mem_io_set_hdr(skb, pm_addr);
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skb->priority = CPL_PRIORITY_CONTROL;
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cxgb3_ofld_send(ddp->tdev, skb);
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}
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return 0;
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}
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static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
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int start, int max, int count,
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struct cxgb3i_gather_list *gl)
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{
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unsigned int i, j;
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spin_lock(&ddp->map_lock);
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for (i = start; i <= max;) {
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for (j = 0; j < count; j++) {
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if (ddp->gl_map[i + j])
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break;
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}
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if (j == count) {
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for (j = 0; j < count; j++)
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ddp->gl_map[i + j] = gl;
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spin_unlock(&ddp->map_lock);
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return i;
|
||||
}
|
||||
i += j + 1;
|
||||
}
|
||||
spin_unlock(&ddp->map_lock);
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
|
||||
int start, int count)
|
||||
{
|
||||
spin_lock(&ddp->map_lock);
|
||||
memset(&ddp->gl_map[start], 0,
|
||||
count * sizeof(struct cxgb3i_gather_list *));
|
||||
spin_unlock(&ddp->map_lock);
|
||||
}
|
||||
|
||||
static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
|
||||
int idx, int count)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < count; i++, idx++)
|
||||
if (ddp->gl_skb[idx]) {
|
||||
kfree_skb(ddp->gl_skb[idx]);
|
||||
ddp->gl_skb[idx] = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
|
||||
int count, gfp_t gfp)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
|
||||
PPOD_SIZE, gfp);
|
||||
if (skb) {
|
||||
ddp->gl_skb[idx + i] = skb;
|
||||
skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
|
||||
} else {
|
||||
ddp_free_gl_skb(ddp, idx, i);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_find_page_index - return ddp page index for a given page size.
|
||||
* @pgsz: page size
|
||||
* return the ddp page index, if no match is found return DDP_PGIDX_MAX.
|
||||
*/
|
||||
int cxgb3i_ddp_find_page_index(unsigned long pgsz)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < DDP_PGIDX_MAX; i++) {
|
||||
if (pgsz == (1UL << ddp_page_shift[i]))
|
||||
return i;
|
||||
}
|
||||
ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
|
||||
return DDP_PGIDX_MAX;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_ddp_find_page_index);
|
||||
|
||||
static inline void ddp_gl_unmap(struct pci_dev *pdev,
|
||||
struct cxgb3i_gather_list *gl)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < gl->nelem; i++)
|
||||
pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
|
||||
PCI_DMA_FROMDEVICE);
|
||||
}
|
||||
|
||||
static inline int ddp_gl_map(struct pci_dev *pdev,
|
||||
struct cxgb3i_gather_list *gl)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < gl->nelem; i++) {
|
||||
gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
|
||||
PAGE_SIZE,
|
||||
PCI_DMA_FROMDEVICE);
|
||||
if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
|
||||
goto unmap;
|
||||
}
|
||||
|
||||
return i;
|
||||
|
||||
unmap:
|
||||
if (i) {
|
||||
unsigned int nelem = gl->nelem;
|
||||
|
||||
gl->nelem = i;
|
||||
ddp_gl_unmap(pdev, gl);
|
||||
gl->nelem = nelem;
|
||||
}
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_make_gl - build ddp page buffer list
|
||||
* @xferlen: total buffer length
|
||||
* @sgl: page buffer scatter-gather list
|
||||
* @sgcnt: # of page buffers
|
||||
* @pdev: pci_dev, used for pci map
|
||||
* @gfp: allocation mode
|
||||
*
|
||||
* construct a ddp page buffer list from the scsi scattergather list.
|
||||
* coalesce buffers as much as possible, and obtain dma addresses for
|
||||
* each page.
|
||||
*
|
||||
* Return the cxgb3i_gather_list constructed from the page buffers if the
|
||||
* memory can be used for ddp. Return NULL otherwise.
|
||||
*/
|
||||
struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
|
||||
struct scatterlist *sgl,
|
||||
unsigned int sgcnt,
|
||||
struct pci_dev *pdev,
|
||||
gfp_t gfp)
|
||||
{
|
||||
struct cxgb3i_gather_list *gl;
|
||||
struct scatterlist *sg = sgl;
|
||||
struct page *sgpage = sg_page(sg);
|
||||
unsigned int sglen = sg->length;
|
||||
unsigned int sgoffset = sg->offset;
|
||||
unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
|
||||
PAGE_SHIFT;
|
||||
int i = 1, j = 0;
|
||||
|
||||
if (xferlen < DDP_THRESHOLD) {
|
||||
ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
|
||||
xferlen, DDP_THRESHOLD);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
|
||||
npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
|
||||
gfp);
|
||||
if (!gl)
|
||||
return NULL;
|
||||
|
||||
gl->pages = (struct page **)&gl->phys_addr[npages];
|
||||
gl->length = xferlen;
|
||||
gl->offset = sgoffset;
|
||||
gl->pages[0] = sgpage;
|
||||
|
||||
sg = sg_next(sg);
|
||||
while (sg) {
|
||||
struct page *page = sg_page(sg);
|
||||
|
||||
if (sgpage == page && sg->offset == sgoffset + sglen)
|
||||
sglen += sg->length;
|
||||
else {
|
||||
/* make sure the sgl is fit for ddp:
|
||||
* each has the same page size, and
|
||||
* all of the middle pages are used completely
|
||||
*/
|
||||
if ((j && sgoffset) ||
|
||||
((i != sgcnt - 1) &&
|
||||
((sglen + sgoffset) & ~PAGE_MASK)))
|
||||
goto error_out;
|
||||
|
||||
j++;
|
||||
if (j == gl->nelem || sg->offset)
|
||||
goto error_out;
|
||||
gl->pages[j] = page;
|
||||
sglen = sg->length;
|
||||
sgoffset = sg->offset;
|
||||
sgpage = page;
|
||||
}
|
||||
i++;
|
||||
sg = sg_next(sg);
|
||||
}
|
||||
gl->nelem = ++j;
|
||||
|
||||
if (ddp_gl_map(pdev, gl) < 0)
|
||||
goto error_out;
|
||||
|
||||
return gl;
|
||||
|
||||
error_out:
|
||||
kfree(gl);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_ddp_make_gl);
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_release_gl - release a page buffer list
|
||||
* @gl: a ddp page buffer list
|
||||
* @pdev: pci_dev used for pci_unmap
|
||||
* free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
|
||||
*/
|
||||
void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
|
||||
struct pci_dev *pdev)
|
||||
{
|
||||
ddp_gl_unmap(pdev, gl);
|
||||
kfree(gl);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_ddp_release_gl);
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
|
||||
* @tdev: t3cdev adapter
|
||||
* @tid: connection id
|
||||
* @tformat: tag format
|
||||
* @tagp: the s/w tag, if ddp setup is successful, it will be updated with
|
||||
* ddp/hw tag
|
||||
* @gl: the page momory list
|
||||
* @gfp: allocation mode
|
||||
*
|
||||
* ddp setup for a given page buffer list and construct the ddp tag.
|
||||
* return 0 if success, < 0 otherwise.
|
||||
*/
|
||||
int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
|
||||
struct cxgb3i_tag_format *tformat, u32 *tagp,
|
||||
struct cxgb3i_gather_list *gl, gfp_t gfp)
|
||||
{
|
||||
struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
|
||||
struct pagepod_hdr hdr;
|
||||
unsigned int npods;
|
||||
int idx = -1, idx_max;
|
||||
int err = -ENOMEM;
|
||||
u32 sw_tag = *tagp;
|
||||
u32 tag;
|
||||
|
||||
if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
|
||||
gl->length < DDP_THRESHOLD) {
|
||||
ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
|
||||
page_idx, gl->length, DDP_THRESHOLD);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
|
||||
idx_max = ddp->nppods - npods + 1;
|
||||
|
||||
if (ddp->idx_last == ddp->nppods)
|
||||
idx = ddp_find_unused_entries(ddp, 0, idx_max, npods, gl);
|
||||
else {
|
||||
idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
|
||||
idx_max, npods, gl);
|
||||
if (idx < 0 && ddp->idx_last >= npods)
|
||||
idx = ddp_find_unused_entries(ddp, 0,
|
||||
ddp->idx_last - npods + 1,
|
||||
npods, gl);
|
||||
}
|
||||
if (idx < 0) {
|
||||
ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
|
||||
gl->length, gl->nelem, npods);
|
||||
return idx;
|
||||
}
|
||||
|
||||
err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
|
||||
if (err < 0)
|
||||
goto unmark_entries;
|
||||
|
||||
tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
|
||||
tag |= idx << PPOD_IDX_SHIFT;
|
||||
|
||||
hdr.rsvd = 0;
|
||||
hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
|
||||
hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
|
||||
hdr.maxoffset = htonl(gl->length);
|
||||
hdr.pgoffset = htonl(gl->offset);
|
||||
|
||||
err = set_ddp_map(ddp, &hdr, idx, npods, gl);
|
||||
if (err < 0)
|
||||
goto free_gl_skb;
|
||||
|
||||
ddp->idx_last = idx;
|
||||
ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
|
||||
gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
|
||||
idx, npods);
|
||||
*tagp = tag;
|
||||
return 0;
|
||||
|
||||
free_gl_skb:
|
||||
ddp_free_gl_skb(ddp, idx, npods);
|
||||
unmark_entries:
|
||||
ddp_unmark_entries(ddp, idx, npods);
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_reserve);
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_tag_release - release a ddp tag
|
||||
* @tdev: t3cdev adapter
|
||||
* @tag: ddp tag
|
||||
* ddp cleanup for a given ddp tag and release all the resources held
|
||||
*/
|
||||
void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
|
||||
{
|
||||
struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
|
||||
u32 idx;
|
||||
|
||||
if (!ddp) {
|
||||
ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
|
||||
return;
|
||||
}
|
||||
|
||||
idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
|
||||
if (idx < ddp->nppods) {
|
||||
struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
|
||||
unsigned int npods;
|
||||
|
||||
if (!gl) {
|
||||
ddp_log_error("release ddp 0x%x, idx 0x%x, gl NULL.\n",
|
||||
tag, idx);
|
||||
return;
|
||||
}
|
||||
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
|
||||
ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
|
||||
tag, idx, npods);
|
||||
clear_ddp_map(ddp, idx, npods);
|
||||
ddp_unmark_entries(ddp, idx, npods);
|
||||
cxgb3i_ddp_release_gl(gl, ddp->pdev);
|
||||
} else
|
||||
ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
|
||||
tag, idx, ddp->nppods);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_release);
|
||||
|
||||
static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
|
||||
int reply)
|
||||
{
|
||||
struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
|
||||
GFP_KERNEL);
|
||||
struct cpl_set_tcb_field *req;
|
||||
u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
|
||||
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
/* set up ulp submode and page size */
|
||||
req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
|
||||
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
|
||||
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
|
||||
req->reply = V_NO_REPLY(reply ? 0 : 1);
|
||||
req->cpu_idx = 0;
|
||||
req->word = htons(31);
|
||||
req->mask = cpu_to_be64(0xF0000000);
|
||||
req->val = cpu_to_be64(val << 28);
|
||||
skb->priority = CPL_PRIORITY_CONTROL;
|
||||
|
||||
cxgb3_ofld_send(tdev, skb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
|
||||
* @tdev: t3cdev adapter
|
||||
* @tid: connection id
|
||||
* @reply: request reply from h/w
|
||||
* set up the ddp page size based on the host PAGE_SIZE for a connection
|
||||
* identified by tid
|
||||
*/
|
||||
int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
|
||||
int reply)
|
||||
{
|
||||
return setup_conn_pgidx(tdev, tid, page_idx, reply);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_host_pagesize);
|
||||
|
||||
/**
|
||||
* cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
|
||||
* @tdev: t3cdev adapter
|
||||
* @tid: connection id
|
||||
* @reply: request reply from h/w
|
||||
* @pgsz: ddp page size
|
||||
* set up the ddp page size for a connection identified by tid
|
||||
*/
|
||||
int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
|
||||
int reply, unsigned long pgsz)
|
||||
{
|
||||
int pgidx = cxgb3i_ddp_find_page_index(pgsz);
|
||||
|
||||
return setup_conn_pgidx(tdev, tid, pgidx, reply);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_pagesize);
|
||||
|
||||
/**
|
||||
* cxgb3i_setup_conn_digest - setup conn. digest setting
|
||||
* @tdev: t3cdev adapter
|
||||
* @tid: connection id
|
||||
* @hcrc: header digest enabled
|
||||
* @dcrc: data digest enabled
|
||||
* @reply: request reply from h/w
|
||||
* set up the iscsi digest settings for a connection identified by tid
|
||||
*/
|
||||
int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
|
||||
int hcrc, int dcrc, int reply)
|
||||
{
|
||||
struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
|
||||
GFP_KERNEL);
|
||||
struct cpl_set_tcb_field *req;
|
||||
u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
|
||||
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
/* set up ulp submode and page size */
|
||||
req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
|
||||
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
|
||||
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
|
||||
req->reply = V_NO_REPLY(reply ? 0 : 1);
|
||||
req->cpu_idx = 0;
|
||||
req->word = htons(31);
|
||||
req->mask = cpu_to_be64(0x0F000000);
|
||||
req->val = cpu_to_be64(val << 24);
|
||||
skb->priority = CPL_PRIORITY_CONTROL;
|
||||
|
||||
cxgb3_ofld_send(tdev, skb);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_digest);
|
||||
|
||||
static int ddp_init(struct t3cdev *tdev)
|
||||
{
|
||||
struct cxgb3i_ddp_info *ddp;
|
||||
struct ulp_iscsi_info uinfo;
|
||||
unsigned int ppmax, bits;
|
||||
int i, err;
|
||||
static int vers_printed;
|
||||
|
||||
if (!vers_printed) {
|
||||
printk(KERN_INFO "%s", version);
|
||||
vers_printed = 1;
|
||||
}
|
||||
|
||||
err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
|
||||
if (err < 0) {
|
||||
ddp_log_error("%s, failed to get iscsi param err=%d.\n",
|
||||
tdev->name, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
|
||||
bits = __ilog2_u32(ppmax) + 1;
|
||||
if (bits > PPOD_IDX_MAX_SIZE)
|
||||
bits = PPOD_IDX_MAX_SIZE;
|
||||
ppmax = (1 << (bits - 1)) - 1;
|
||||
|
||||
ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
|
||||
ppmax *
|
||||
(sizeof(struct cxgb3i_gather_list *) +
|
||||
sizeof(struct sk_buff *)),
|
||||
GFP_KERNEL);
|
||||
if (!ddp) {
|
||||
ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
|
||||
tdev->name, ppmax);
|
||||
return 0;
|
||||
}
|
||||
ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
|
||||
ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
|
||||
ppmax *
|
||||
sizeof(struct cxgb3i_gather_list *));
|
||||
spin_lock_init(&ddp->map_lock);
|
||||
|
||||
ddp->tdev = tdev;
|
||||
ddp->pdev = uinfo.pdev;
|
||||
ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
|
||||
ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
|
||||
ddp->llimit = uinfo.llimit;
|
||||
ddp->ulimit = uinfo.ulimit;
|
||||
ddp->nppods = ppmax;
|
||||
ddp->idx_last = ppmax;
|
||||
ddp->idx_bits = bits;
|
||||
ddp->idx_mask = (1 << bits) - 1;
|
||||
ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
|
||||
|
||||
uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
|
||||
for (i = 0; i < DDP_PGIDX_MAX; i++)
|
||||
uinfo.pgsz_factor[i] = ddp_page_order[i];
|
||||
uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
|
||||
|
||||
err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
|
||||
if (err < 0) {
|
||||
ddp_log_warn("%s unable to set iscsi param err=%d, "
|
||||
"ddp disabled.\n", tdev->name, err);
|
||||
goto free_ddp_map;
|
||||
}
|
||||
|
||||
tdev->ulp_iscsi = ddp;
|
||||
|
||||
/* add to the list */
|
||||
write_lock(&cxgb3i_ddp_rwlock);
|
||||
list_add_tail(&ddp->list, &cxgb3i_ddp_list);
|
||||
write_unlock(&cxgb3i_ddp_rwlock);
|
||||
|
||||
ddp_log_info("nppods %u (0x%x ~ 0x%x), bits %u, mask 0x%x,0x%x "
|
||||
"pkt %u,%u.\n",
|
||||
ppmax, ddp->llimit, ddp->ulimit, ddp->idx_bits,
|
||||
ddp->idx_mask, ddp->rsvd_tag_mask,
|
||||
ddp->max_txsz, ddp->max_rxsz);
|
||||
return 0;
|
||||
|
||||
free_ddp_map:
|
||||
cxgb3i_free_big_mem(ddp);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_adapter_ddp_init - initialize the adapter's ddp resource
|
||||
* @tdev: t3cdev adapter
|
||||
* @tformat: tag format
|
||||
* @txsz: max tx pkt size, filled in by this func.
|
||||
* @rxsz: max rx pkt size, filled in by this func.
|
||||
* initialize the ddp pagepod manager for a given adapter if needed and
|
||||
* setup the tag format for a given iscsi entity
|
||||
*/
|
||||
int cxgb3i_adapter_ddp_init(struct t3cdev *tdev,
|
||||
struct cxgb3i_tag_format *tformat,
|
||||
unsigned int *txsz, unsigned int *rxsz)
|
||||
{
|
||||
struct cxgb3i_ddp_info *ddp;
|
||||
unsigned char idx_bits;
|
||||
|
||||
if (!tformat)
|
||||
return -EINVAL;
|
||||
|
||||
if (!tdev->ulp_iscsi) {
|
||||
int err = ddp_init(tdev);
|
||||
if (err < 0)
|
||||
return err;
|
||||
}
|
||||
ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
|
||||
|
||||
idx_bits = 32 - tformat->sw_bits;
|
||||
tformat->rsvd_bits = ddp->idx_bits;
|
||||
tformat->rsvd_shift = PPOD_IDX_SHIFT;
|
||||
tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
|
||||
|
||||
ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
|
||||
tformat->sw_bits, tformat->rsvd_bits,
|
||||
tformat->rsvd_shift, tformat->rsvd_mask);
|
||||
|
||||
*txsz = ddp->max_txsz;
|
||||
*rxsz = ddp->max_rxsz;
|
||||
ddp_log_info("ddp max pkt size: %u, %u.\n",
|
||||
ddp->max_txsz, ddp->max_rxsz);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_init);
|
||||
|
||||
static void ddp_release(struct cxgb3i_ddp_info *ddp)
|
||||
{
|
||||
int i = 0;
|
||||
struct t3cdev *tdev = ddp->tdev;
|
||||
|
||||
tdev->ulp_iscsi = NULL;
|
||||
while (i < ddp->nppods) {
|
||||
struct cxgb3i_gather_list *gl = ddp->gl_map[i];
|
||||
if (gl) {
|
||||
int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
|
||||
>> PPOD_PAGES_SHIFT;
|
||||
|
||||
kfree(gl);
|
||||
ddp_free_gl_skb(ddp, i, npods);
|
||||
} else
|
||||
i++;
|
||||
}
|
||||
cxgb3i_free_big_mem(ddp);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_adapter_ddp_cleanup - release the adapter's ddp resource
|
||||
* @tdev: t3cdev adapter
|
||||
* release all the resource held by the ddp pagepod manager for a given
|
||||
* adapter if needed
|
||||
*/
|
||||
void cxgb3i_adapter_ddp_cleanup(struct t3cdev *tdev)
|
||||
{
|
||||
struct cxgb3i_ddp_info *ddp;
|
||||
|
||||
/* remove from the list */
|
||||
write_lock(&cxgb3i_ddp_rwlock);
|
||||
list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
|
||||
if (ddp->tdev == tdev) {
|
||||
list_del(&ddp->list);
|
||||
break;
|
||||
}
|
||||
}
|
||||
write_unlock(&cxgb3i_ddp_rwlock);
|
||||
|
||||
if (ddp)
|
||||
ddp_release(ddp);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_cleanup);
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_init_module - module init entry point
|
||||
* initialize any driver wide global data structures
|
||||
*/
|
||||
static int __init cxgb3i_ddp_init_module(void)
|
||||
{
|
||||
page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
|
||||
ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
|
||||
PAGE_SIZE, page_idx);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_exit_module - module cleanup/exit entry point
|
||||
* go through the ddp list and release any resource held.
|
||||
*/
|
||||
static void __exit cxgb3i_ddp_exit_module(void)
|
||||
{
|
||||
struct cxgb3i_ddp_info *ddp;
|
||||
|
||||
/* release all ddp manager if there is any */
|
||||
write_lock(&cxgb3i_ddp_rwlock);
|
||||
list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
|
||||
list_del(&ddp->list);
|
||||
ddp_release(ddp);
|
||||
}
|
||||
write_unlock(&cxgb3i_ddp_rwlock);
|
||||
}
|
||||
|
||||
module_init(cxgb3i_ddp_init_module);
|
||||
module_exit(cxgb3i_ddp_exit_module);
|
||||
306
drivers/scsi/cxgb3i/cxgb3i_ddp.h
Normal file
306
drivers/scsi/cxgb3i/cxgb3i_ddp.h
Normal file
|
|
@ -0,0 +1,306 @@
|
|||
/*
|
||||
* cxgb3i_ddp.h: Chelsio S3xx iSCSI DDP Manager.
|
||||
*
|
||||
* Copyright (c) 2008 Chelsio Communications, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation.
|
||||
*
|
||||
* Written by: Karen Xie (kxie@chelsio.com)
|
||||
*/
|
||||
|
||||
#ifndef __CXGB3I_ULP2_DDP_H__
|
||||
#define __CXGB3I_ULP2_DDP_H__
|
||||
|
||||
/**
|
||||
* struct cxgb3i_tag_format - cxgb3i ulp tag format for an iscsi entity
|
||||
*
|
||||
* @sw_bits: # of bits used by iscsi software layer
|
||||
* @rsvd_bits: # of bits used by h/w
|
||||
* @rsvd_shift: h/w bits shift left
|
||||
* @rsvd_mask: reserved bit mask
|
||||
*/
|
||||
struct cxgb3i_tag_format {
|
||||
unsigned char sw_bits;
|
||||
unsigned char rsvd_bits;
|
||||
unsigned char rsvd_shift;
|
||||
unsigned char filler[1];
|
||||
u32 rsvd_mask;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct cxgb3i_gather_list - cxgb3i direct data placement memory
|
||||
*
|
||||
* @tag: ddp tag
|
||||
* @length: total data buffer length
|
||||
* @offset: initial offset to the 1st page
|
||||
* @nelem: # of pages
|
||||
* @pages: page pointers
|
||||
* @phys_addr: physical address
|
||||
*/
|
||||
struct cxgb3i_gather_list {
|
||||
u32 tag;
|
||||
unsigned int length;
|
||||
unsigned int offset;
|
||||
unsigned int nelem;
|
||||
struct page **pages;
|
||||
dma_addr_t phys_addr[0];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct cxgb3i_ddp_info - cxgb3i direct data placement for pdu payload
|
||||
*
|
||||
* @list: list head to link elements
|
||||
* @tdev: pointer to t3cdev used by cxgb3 driver
|
||||
* @max_txsz: max tx packet size for ddp
|
||||
* @max_rxsz: max rx packet size for ddp
|
||||
* @llimit: lower bound of the page pod memory
|
||||
* @ulimit: upper bound of the page pod memory
|
||||
* @nppods: # of page pod entries
|
||||
* @idx_last: page pod entry last used
|
||||
* @idx_bits: # of bits the pagepod index would take
|
||||
* @idx_mask: pagepod index mask
|
||||
* @rsvd_tag_mask: tag mask
|
||||
* @map_lock: lock to synchonize access to the page pod map
|
||||
* @gl_map: ddp memory gather list
|
||||
* @gl_skb: skb used to program the pagepod
|
||||
*/
|
||||
struct cxgb3i_ddp_info {
|
||||
struct list_head list;
|
||||
struct t3cdev *tdev;
|
||||
struct pci_dev *pdev;
|
||||
unsigned int max_txsz;
|
||||
unsigned int max_rxsz;
|
||||
unsigned int llimit;
|
||||
unsigned int ulimit;
|
||||
unsigned int nppods;
|
||||
unsigned int idx_last;
|
||||
unsigned char idx_bits;
|
||||
unsigned char filler[3];
|
||||
u32 idx_mask;
|
||||
u32 rsvd_tag_mask;
|
||||
spinlock_t map_lock;
|
||||
struct cxgb3i_gather_list **gl_map;
|
||||
struct sk_buff **gl_skb;
|
||||
};
|
||||
|
||||
#define ULP2_MAX_PKT_SIZE 16224
|
||||
#define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_MAX)
|
||||
#define PPOD_PAGES_MAX 4
|
||||
#define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
|
||||
|
||||
/*
|
||||
* struct pagepod_hdr, pagepod - pagepod format
|
||||
*/
|
||||
struct pagepod_hdr {
|
||||
u32 vld_tid;
|
||||
u32 pgsz_tag_clr;
|
||||
u32 maxoffset;
|
||||
u32 pgoffset;
|
||||
u64 rsvd;
|
||||
};
|
||||
|
||||
struct pagepod {
|
||||
struct pagepod_hdr hdr;
|
||||
u64 addr[PPOD_PAGES_MAX + 1];
|
||||
};
|
||||
|
||||
#define PPOD_SIZE sizeof(struct pagepod) /* 64 */
|
||||
#define PPOD_SIZE_SHIFT 6
|
||||
|
||||
#define PPOD_COLOR_SHIFT 0
|
||||
#define PPOD_COLOR_SIZE 6
|
||||
#define PPOD_COLOR_MASK ((1 << PPOD_COLOR_SIZE) - 1)
|
||||
|
||||
#define PPOD_IDX_SHIFT PPOD_COLOR_SIZE
|
||||
#define PPOD_IDX_MAX_SIZE 24
|
||||
|
||||
#define S_PPOD_TID 0
|
||||
#define M_PPOD_TID 0xFFFFFF
|
||||
#define V_PPOD_TID(x) ((x) << S_PPOD_TID)
|
||||
|
||||
#define S_PPOD_VALID 24
|
||||
#define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
|
||||
#define F_PPOD_VALID V_PPOD_VALID(1U)
|
||||
|
||||
#define S_PPOD_COLOR 0
|
||||
#define M_PPOD_COLOR 0x3F
|
||||
#define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
|
||||
|
||||
#define S_PPOD_TAG 6
|
||||
#define M_PPOD_TAG 0xFFFFFF
|
||||
#define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
|
||||
|
||||
#define S_PPOD_PGSZ 30
|
||||
#define M_PPOD_PGSZ 0x3
|
||||
#define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
|
||||
|
||||
/*
|
||||
* large memory chunk allocation/release
|
||||
* use vmalloc() if kmalloc() fails
|
||||
*/
|
||||
static inline void *cxgb3i_alloc_big_mem(unsigned int size,
|
||||
gfp_t gfp)
|
||||
{
|
||||
void *p = kmalloc(size, gfp);
|
||||
if (!p)
|
||||
p = vmalloc(size);
|
||||
if (p)
|
||||
memset(p, 0, size);
|
||||
return p;
|
||||
}
|
||||
|
||||
static inline void cxgb3i_free_big_mem(void *addr)
|
||||
{
|
||||
if (is_vmalloc_addr(addr))
|
||||
vfree(addr);
|
||||
else
|
||||
kfree(addr);
|
||||
}
|
||||
|
||||
/*
|
||||
* cxgb3i ddp tag are 32 bits, it consists of reserved bits used by h/w and
|
||||
* non-reserved bits that can be used by the iscsi s/w.
|
||||
* The reserved bits are identified by the rsvd_bits and rsvd_shift fields
|
||||
* in struct cxgb3i_tag_format.
|
||||
*
|
||||
* The upper most reserved bit can be used to check if a tag is ddp tag or not:
|
||||
* if the bit is 0, the tag is a valid ddp tag
|
||||
*/
|
||||
|
||||
/**
|
||||
* cxgb3i_is_ddp_tag - check if a given tag is a hw/ddp tag
|
||||
* @tformat: tag format information
|
||||
* @tag: tag to be checked
|
||||
*
|
||||
* return true if the tag is a ddp tag, false otherwise.
|
||||
*/
|
||||
static inline int cxgb3i_is_ddp_tag(struct cxgb3i_tag_format *tformat, u32 tag)
|
||||
{
|
||||
return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_sw_tag_usable - check if a given s/w tag has enough bits left for
|
||||
* the reserved/hw bits
|
||||
* @tformat: tag format information
|
||||
* @sw_tag: s/w tag to be checked
|
||||
*
|
||||
* return true if the tag is a ddp tag, false otherwise.
|
||||
*/
|
||||
static inline int cxgb3i_sw_tag_usable(struct cxgb3i_tag_format *tformat,
|
||||
u32 sw_tag)
|
||||
{
|
||||
sw_tag >>= (32 - tformat->rsvd_bits);
|
||||
return !sw_tag;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_set_non_ddp_tag - mark a given s/w tag as an invalid ddp tag
|
||||
* @tformat: tag format information
|
||||
* @sw_tag: s/w tag to be checked
|
||||
*
|
||||
* insert 1 at the upper most reserved bit to mark it as an invalid ddp tag.
|
||||
*/
|
||||
static inline u32 cxgb3i_set_non_ddp_tag(struct cxgb3i_tag_format *tformat,
|
||||
u32 sw_tag)
|
||||
{
|
||||
unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
|
||||
u32 mask = (1 << shift) - 1;
|
||||
|
||||
if (sw_tag && (sw_tag & ~mask)) {
|
||||
u32 v1 = sw_tag & ((1 << shift) - 1);
|
||||
u32 v2 = (sw_tag >> (shift - 1)) << shift;
|
||||
|
||||
return v2 | v1 | 1 << shift;
|
||||
}
|
||||
return sw_tag | 1 << shift;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_ddp_tag_base - shift the s/w tag bits so that reserved bits are not
|
||||
* used.
|
||||
* @tformat: tag format information
|
||||
* @sw_tag: s/w tag to be checked
|
||||
*/
|
||||
static inline u32 cxgb3i_ddp_tag_base(struct cxgb3i_tag_format *tformat,
|
||||
u32 sw_tag)
|
||||
{
|
||||
u32 mask = (1 << tformat->rsvd_shift) - 1;
|
||||
|
||||
if (sw_tag && (sw_tag & ~mask)) {
|
||||
u32 v1 = sw_tag & mask;
|
||||
u32 v2 = sw_tag >> tformat->rsvd_shift;
|
||||
|
||||
v2 <<= tformat->rsvd_shift + tformat->rsvd_bits;
|
||||
return v2 | v1;
|
||||
}
|
||||
return sw_tag;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_tag_rsvd_bits - get the reserved bits used by the h/w
|
||||
* @tformat: tag format information
|
||||
* @tag: tag to be checked
|
||||
*
|
||||
* return the reserved bits in the tag
|
||||
*/
|
||||
static inline u32 cxgb3i_tag_rsvd_bits(struct cxgb3i_tag_format *tformat,
|
||||
u32 tag)
|
||||
{
|
||||
if (cxgb3i_is_ddp_tag(tformat, tag))
|
||||
return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_tag_nonrsvd_bits - get the non-reserved bits used by the s/w
|
||||
* @tformat: tag format information
|
||||
* @tag: tag to be checked
|
||||
*
|
||||
* return the non-reserved bits in the tag.
|
||||
*/
|
||||
static inline u32 cxgb3i_tag_nonrsvd_bits(struct cxgb3i_tag_format *tformat,
|
||||
u32 tag)
|
||||
{
|
||||
unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
|
||||
u32 v1, v2;
|
||||
|
||||
if (cxgb3i_is_ddp_tag(tformat, tag)) {
|
||||
v1 = tag & ((1 << tformat->rsvd_shift) - 1);
|
||||
v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
|
||||
} else {
|
||||
u32 mask = (1 << shift) - 1;
|
||||
|
||||
tag &= ~(1 << shift);
|
||||
v1 = tag & mask;
|
||||
v2 = (tag >> 1) & ~mask;
|
||||
}
|
||||
return v1 | v2;
|
||||
}
|
||||
|
||||
int cxgb3i_ddp_tag_reserve(struct t3cdev *, unsigned int tid,
|
||||
struct cxgb3i_tag_format *, u32 *tag,
|
||||
struct cxgb3i_gather_list *, gfp_t gfp);
|
||||
void cxgb3i_ddp_tag_release(struct t3cdev *, u32 tag);
|
||||
|
||||
struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
|
||||
struct scatterlist *sgl,
|
||||
unsigned int sgcnt,
|
||||
struct pci_dev *pdev,
|
||||
gfp_t gfp);
|
||||
void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
|
||||
struct pci_dev *pdev);
|
||||
|
||||
int cxgb3i_setup_conn_host_pagesize(struct t3cdev *, unsigned int tid,
|
||||
int reply);
|
||||
int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned int tid, int reply,
|
||||
unsigned long pgsz);
|
||||
int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
|
||||
int hcrc, int dcrc, int reply);
|
||||
int cxgb3i_ddp_find_page_index(unsigned long pgsz);
|
||||
int cxgb3i_adapter_ddp_init(struct t3cdev *, struct cxgb3i_tag_format *,
|
||||
unsigned int *txsz, unsigned int *rxsz);
|
||||
void cxgb3i_adapter_ddp_cleanup(struct t3cdev *);
|
||||
#endif
|
||||
107
drivers/scsi/cxgb3i/cxgb3i_init.c
Normal file
107
drivers/scsi/cxgb3i/cxgb3i_init.c
Normal file
|
|
@ -0,0 +1,107 @@
|
|||
/* cxgb3i_init.c: Chelsio S3xx iSCSI driver.
|
||||
*
|
||||
* Copyright (c) 2008 Chelsio Communications, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation.
|
||||
*
|
||||
* Written by: Karen Xie (kxie@chelsio.com)
|
||||
*/
|
||||
|
||||
#include "cxgb3i.h"
|
||||
|
||||
#define DRV_MODULE_NAME "cxgb3i"
|
||||
#define DRV_MODULE_VERSION "1.0.0"
|
||||
#define DRV_MODULE_RELDATE "Jun. 1, 2008"
|
||||
|
||||
static char version[] =
|
||||
"Chelsio S3xx iSCSI Driver " DRV_MODULE_NAME
|
||||
" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
|
||||
|
||||
MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
|
||||
MODULE_DESCRIPTION("Chelsio S3xx iSCSI Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_VERSION(DRV_MODULE_VERSION);
|
||||
|
||||
static void open_s3_dev(struct t3cdev *);
|
||||
static void close_s3_dev(struct t3cdev *);
|
||||
|
||||
static cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
|
||||
static struct cxgb3_client t3c_client = {
|
||||
.name = "iscsi_cxgb3",
|
||||
.handlers = cxgb3i_cpl_handlers,
|
||||
.add = open_s3_dev,
|
||||
.remove = close_s3_dev,
|
||||
};
|
||||
|
||||
/**
|
||||
* open_s3_dev - register with cxgb3 LLD
|
||||
* @t3dev: cxgb3 adapter instance
|
||||
*/
|
||||
static void open_s3_dev(struct t3cdev *t3dev)
|
||||
{
|
||||
static int vers_printed;
|
||||
|
||||
if (!vers_printed) {
|
||||
printk(KERN_INFO "%s", version);
|
||||
vers_printed = 1;
|
||||
}
|
||||
|
||||
cxgb3i_sdev_add(t3dev, &t3c_client);
|
||||
cxgb3i_adapter_add(t3dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* close_s3_dev - de-register with cxgb3 LLD
|
||||
* @t3dev: cxgb3 adapter instance
|
||||
*/
|
||||
static void close_s3_dev(struct t3cdev *t3dev)
|
||||
{
|
||||
cxgb3i_adapter_remove(t3dev);
|
||||
cxgb3i_sdev_remove(t3dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_init_module - module init entry point
|
||||
*
|
||||
* initialize any driver wide global data structures and register itself
|
||||
* with the cxgb3 module
|
||||
*/
|
||||
static int __init cxgb3i_init_module(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = cxgb3i_sdev_init(cxgb3i_cpl_handlers);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
err = cxgb3i_iscsi_init();
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
err = cxgb3i_pdu_init();
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
cxgb3_register_client(&t3c_client);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_exit_module - module cleanup/exit entry point
|
||||
*
|
||||
* go through the driver hba list and for each hba, release any resource held.
|
||||
* and unregisters iscsi transport and the cxgb3 module
|
||||
*/
|
||||
static void __exit cxgb3i_exit_module(void)
|
||||
{
|
||||
cxgb3_unregister_client(&t3c_client);
|
||||
cxgb3i_pdu_cleanup();
|
||||
cxgb3i_iscsi_cleanup();
|
||||
cxgb3i_sdev_cleanup();
|
||||
}
|
||||
|
||||
module_init(cxgb3i_init_module);
|
||||
module_exit(cxgb3i_exit_module);
|
||||
951
drivers/scsi/cxgb3i/cxgb3i_iscsi.c
Normal file
951
drivers/scsi/cxgb3i/cxgb3i_iscsi.c
Normal file
|
|
@ -0,0 +1,951 @@
|
|||
/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
|
||||
*
|
||||
* Copyright (c) 2008 Chelsio Communications, Inc.
|
||||
* Copyright (c) 2008 Mike Christie
|
||||
* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation.
|
||||
*
|
||||
* Written by: Karen Xie (kxie@chelsio.com)
|
||||
*/
|
||||
|
||||
#include <linux/inet.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <net/tcp.h>
|
||||
#include <scsi/scsi_cmnd.h>
|
||||
#include <scsi/scsi_device.h>
|
||||
#include <scsi/scsi_eh.h>
|
||||
#include <scsi/scsi_host.h>
|
||||
#include <scsi/scsi.h>
|
||||
#include <scsi/iscsi_proto.h>
|
||||
#include <scsi/libiscsi.h>
|
||||
#include <scsi/scsi_transport_iscsi.h>
|
||||
|
||||
#include "cxgb3i.h"
|
||||
#include "cxgb3i_pdu.h"
|
||||
|
||||
#ifdef __DEBUG_CXGB3I_TAG__
|
||||
#define cxgb3i_tag_debug cxgb3i_log_debug
|
||||
#else
|
||||
#define cxgb3i_tag_debug(fmt...)
|
||||
#endif
|
||||
|
||||
#ifdef __DEBUG_CXGB3I_API__
|
||||
#define cxgb3i_api_debug cxgb3i_log_debug
|
||||
#else
|
||||
#define cxgb3i_api_debug(fmt...)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* align pdu size to multiple of 512 for better performance
|
||||
*/
|
||||
#define align_pdu_size(n) do { n = (n) & (~511); } while (0)
|
||||
|
||||
static struct scsi_transport_template *cxgb3i_scsi_transport;
|
||||
static struct scsi_host_template cxgb3i_host_template;
|
||||
static struct iscsi_transport cxgb3i_iscsi_transport;
|
||||
static unsigned char sw_tag_idx_bits;
|
||||
static unsigned char sw_tag_age_bits;
|
||||
|
||||
static LIST_HEAD(cxgb3i_snic_list);
|
||||
static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
|
||||
|
||||
/**
|
||||
* cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
|
||||
* @t3dev: t3cdev adapter
|
||||
* return the resulting cxgb3i_adapter struct
|
||||
*/
|
||||
struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
|
||||
{
|
||||
struct cxgb3i_adapter *snic;
|
||||
struct adapter *adapter = tdev2adap(t3dev);
|
||||
int i;
|
||||
|
||||
snic = kzalloc(sizeof(*snic), GFP_KERNEL);
|
||||
if (!snic) {
|
||||
cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
|
||||
return NULL;
|
||||
}
|
||||
spin_lock_init(&snic->lock);
|
||||
|
||||
snic->tdev = t3dev;
|
||||
snic->pdev = adapter->pdev;
|
||||
snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
|
||||
|
||||
if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
|
||||
&snic->tx_max_size,
|
||||
&snic->rx_max_size) < 0)
|
||||
goto free_snic;
|
||||
|
||||
for_each_port(adapter, i) {
|
||||
snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
|
||||
if (!snic->hba[i])
|
||||
goto ulp_cleanup;
|
||||
}
|
||||
snic->hba_cnt = adapter->params.nports;
|
||||
|
||||
/* add to the list */
|
||||
write_lock(&cxgb3i_snic_rwlock);
|
||||
list_add_tail(&snic->list_head, &cxgb3i_snic_list);
|
||||
write_unlock(&cxgb3i_snic_rwlock);
|
||||
|
||||
return snic;
|
||||
|
||||
ulp_cleanup:
|
||||
cxgb3i_adapter_ddp_cleanup(t3dev);
|
||||
free_snic:
|
||||
kfree(snic);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_adapter_remove - release all the resources held and cleanup any
|
||||
* h/w settings
|
||||
* @t3dev: t3cdev adapter
|
||||
*/
|
||||
void cxgb3i_adapter_remove(struct t3cdev *t3dev)
|
||||
{
|
||||
int i;
|
||||
struct cxgb3i_adapter *snic;
|
||||
|
||||
/* remove from the list */
|
||||
write_lock(&cxgb3i_snic_rwlock);
|
||||
list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
|
||||
if (snic->tdev == t3dev) {
|
||||
list_del(&snic->list_head);
|
||||
break;
|
||||
}
|
||||
}
|
||||
write_unlock(&cxgb3i_snic_rwlock);
|
||||
|
||||
if (snic) {
|
||||
for (i = 0; i < snic->hba_cnt; i++) {
|
||||
if (snic->hba[i]) {
|
||||
cxgb3i_hba_host_remove(snic->hba[i]);
|
||||
snic->hba[i] = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
/* release ddp resources */
|
||||
cxgb3i_adapter_ddp_cleanup(snic->tdev);
|
||||
kfree(snic);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
|
||||
* net_device
|
||||
* @t3dev: t3cdev adapter
|
||||
*/
|
||||
struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
|
||||
{
|
||||
struct cxgb3i_adapter *snic;
|
||||
int i;
|
||||
|
||||
read_lock(&cxgb3i_snic_rwlock);
|
||||
list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
|
||||
for (i = 0; i < snic->hba_cnt; i++) {
|
||||
if (snic->hba[i]->ndev == ndev) {
|
||||
read_unlock(&cxgb3i_snic_rwlock);
|
||||
return snic->hba[i];
|
||||
}
|
||||
}
|
||||
}
|
||||
read_unlock(&cxgb3i_snic_rwlock);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_hba_host_add - register a new host with scsi/iscsi
|
||||
* @snic: the cxgb3i adapter
|
||||
* @ndev: associated net_device
|
||||
*/
|
||||
struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
|
||||
struct net_device *ndev)
|
||||
{
|
||||
struct cxgb3i_hba *hba;
|
||||
struct Scsi_Host *shost;
|
||||
int err;
|
||||
|
||||
shost = iscsi_host_alloc(&cxgb3i_host_template,
|
||||
sizeof(struct cxgb3i_hba),
|
||||
CXGB3I_SCSI_QDEPTH_DFLT);
|
||||
if (!shost) {
|
||||
cxgb3i_log_info("iscsi_host_alloc failed.\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
shost->transportt = cxgb3i_scsi_transport;
|
||||
shost->max_lun = CXGB3I_MAX_LUN;
|
||||
shost->max_id = CXGB3I_MAX_TARGET;
|
||||
shost->max_channel = 0;
|
||||
shost->max_cmd_len = 16;
|
||||
|
||||
hba = iscsi_host_priv(shost);
|
||||
hba->snic = snic;
|
||||
hba->ndev = ndev;
|
||||
hba->shost = shost;
|
||||
|
||||
pci_dev_get(snic->pdev);
|
||||
err = iscsi_host_add(shost, &snic->pdev->dev);
|
||||
if (err) {
|
||||
cxgb3i_log_info("iscsi_host_add failed.\n");
|
||||
goto pci_dev_put;
|
||||
}
|
||||
|
||||
cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
|
||||
shost, hba, shost->host_no);
|
||||
|
||||
return hba;
|
||||
|
||||
pci_dev_put:
|
||||
pci_dev_put(snic->pdev);
|
||||
scsi_host_put(shost);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
|
||||
* @hba: the cxgb3i hba
|
||||
*/
|
||||
void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
|
||||
{
|
||||
cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
|
||||
hba->shost, hba, hba->shost->host_no);
|
||||
iscsi_host_remove(hba->shost);
|
||||
pci_dev_put(hba->snic->pdev);
|
||||
iscsi_host_free(hba->shost);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_ep_connect - establish TCP connection to target portal
|
||||
* @dst_addr: target IP address
|
||||
* @non_blocking: blocking or non-blocking call
|
||||
*
|
||||
* Initiates a TCP/IP connection to the dst_addr
|
||||
*/
|
||||
static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
|
||||
int non_blocking)
|
||||
{
|
||||
struct iscsi_endpoint *ep;
|
||||
struct cxgb3i_endpoint *cep;
|
||||
struct cxgb3i_hba *hba;
|
||||
struct s3_conn *c3cn = NULL;
|
||||
int err = 0;
|
||||
|
||||
c3cn = cxgb3i_c3cn_create();
|
||||
if (!c3cn) {
|
||||
cxgb3i_log_info("ep connect OOM.\n");
|
||||
err = -ENOMEM;
|
||||
goto release_conn;
|
||||
}
|
||||
|
||||
err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
|
||||
if (err < 0) {
|
||||
cxgb3i_log_info("ep connect failed.\n");
|
||||
goto release_conn;
|
||||
}
|
||||
hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
|
||||
if (!hba) {
|
||||
err = -ENOSPC;
|
||||
cxgb3i_log_info("NOT going through cxgbi device.\n");
|
||||
goto release_conn;
|
||||
}
|
||||
if (c3cn_is_closing(c3cn)) {
|
||||
err = -ENOSPC;
|
||||
cxgb3i_log_info("ep connect unable to connect.\n");
|
||||
goto release_conn;
|
||||
}
|
||||
|
||||
ep = iscsi_create_endpoint(sizeof(*cep));
|
||||
if (!ep) {
|
||||
err = -ENOMEM;
|
||||
cxgb3i_log_info("iscsi alloc ep, OOM.\n");
|
||||
goto release_conn;
|
||||
}
|
||||
cep = ep->dd_data;
|
||||
cep->c3cn = c3cn;
|
||||
cep->hba = hba;
|
||||
|
||||
cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
|
||||
ep, cep, c3cn, hba);
|
||||
return ep;
|
||||
|
||||
release_conn:
|
||||
cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
|
||||
if (c3cn)
|
||||
cxgb3i_c3cn_release(c3cn);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_ep_poll - polls for TCP connection establishement
|
||||
* @ep: TCP connection (endpoint) handle
|
||||
* @timeout_ms: timeout value in milli secs
|
||||
*
|
||||
* polls for TCP connect request to complete
|
||||
*/
|
||||
static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
|
||||
{
|
||||
struct cxgb3i_endpoint *cep = ep->dd_data;
|
||||
struct s3_conn *c3cn = cep->c3cn;
|
||||
|
||||
if (!c3cn_is_established(c3cn))
|
||||
return 0;
|
||||
cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
|
||||
return 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_ep_disconnect - teardown TCP connection
|
||||
* @ep: TCP connection (endpoint) handle
|
||||
*
|
||||
* teardown TCP connection
|
||||
*/
|
||||
static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
|
||||
{
|
||||
struct cxgb3i_endpoint *cep = ep->dd_data;
|
||||
struct cxgb3i_conn *cconn = cep->cconn;
|
||||
|
||||
cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
|
||||
|
||||
if (cconn && cconn->conn) {
|
||||
/*
|
||||
* stop the xmit path so the xmit_pdu function is
|
||||
* not being called
|
||||
*/
|
||||
iscsi_suspend_tx(cconn->conn);
|
||||
|
||||
write_lock_bh(&cep->c3cn->callback_lock);
|
||||
cep->c3cn->user_data = NULL;
|
||||
cconn->cep = NULL;
|
||||
write_unlock_bh(&cep->c3cn->callback_lock);
|
||||
}
|
||||
|
||||
cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
|
||||
ep, cep, cep->c3cn);
|
||||
cxgb3i_c3cn_release(cep->c3cn);
|
||||
iscsi_destroy_endpoint(ep);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_session_create - create a new iscsi session
|
||||
* @cmds_max: max # of commands
|
||||
* @qdepth: scsi queue depth
|
||||
* @initial_cmdsn: initial iscsi CMDSN for this session
|
||||
* @host_no: pointer to return host no
|
||||
*
|
||||
* Creates a new iSCSI session
|
||||
*/
|
||||
static struct iscsi_cls_session *
|
||||
cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
|
||||
u32 initial_cmdsn, u32 *host_no)
|
||||
{
|
||||
struct cxgb3i_endpoint *cep;
|
||||
struct cxgb3i_hba *hba;
|
||||
struct Scsi_Host *shost;
|
||||
struct iscsi_cls_session *cls_session;
|
||||
struct iscsi_session *session;
|
||||
|
||||
if (!ep) {
|
||||
cxgb3i_log_error("%s, missing endpoint.\n", __func__);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
cep = ep->dd_data;
|
||||
hba = cep->hba;
|
||||
shost = hba->shost;
|
||||
cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
|
||||
BUG_ON(hba != iscsi_host_priv(shost));
|
||||
|
||||
*host_no = shost->host_no;
|
||||
|
||||
cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
|
||||
cmds_max,
|
||||
sizeof(struct iscsi_tcp_task),
|
||||
initial_cmdsn, ISCSI_MAX_TARGET);
|
||||
if (!cls_session)
|
||||
return NULL;
|
||||
session = cls_session->dd_data;
|
||||
if (iscsi_tcp_r2tpool_alloc(session))
|
||||
goto remove_session;
|
||||
|
||||
return cls_session;
|
||||
|
||||
remove_session:
|
||||
iscsi_session_teardown(cls_session);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_session_destroy - destroys iscsi session
|
||||
* @cls_session: pointer to iscsi cls session
|
||||
*
|
||||
* Destroys an iSCSI session instance and releases its all resources held
|
||||
*/
|
||||
static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
|
||||
{
|
||||
cxgb3i_api_debug("sess 0x%p.\n", cls_session);
|
||||
iscsi_tcp_r2tpool_free(cls_session->dd_data);
|
||||
iscsi_session_teardown(cls_session);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
|
||||
* reduce it to be within the hardware limit if needed
|
||||
* @conn: iscsi connection
|
||||
*/
|
||||
static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
|
||||
|
||||
{
|
||||
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
|
||||
cconn->hba->snic->tx_max_size -
|
||||
ISCSI_PDU_NONPAYLOAD_MAX);
|
||||
|
||||
if (conn->max_xmit_dlength)
|
||||
conn->max_xmit_dlength = min_t(unsigned int,
|
||||
conn->max_xmit_dlength, max);
|
||||
else
|
||||
conn->max_xmit_dlength = max;
|
||||
align_pdu_size(conn->max_xmit_dlength);
|
||||
cxgb3i_log_info("conn 0x%p, max xmit %u.\n",
|
||||
conn, conn->max_xmit_dlength);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
|
||||
* the hardware limit
|
||||
* @conn: iscsi connection
|
||||
* return 0 if the value is valid, < 0 otherwise.
|
||||
*/
|
||||
static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
|
||||
{
|
||||
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
|
||||
cconn->hba->snic->rx_max_size -
|
||||
ISCSI_PDU_NONPAYLOAD_MAX);
|
||||
|
||||
align_pdu_size(max);
|
||||
if (conn->max_recv_dlength) {
|
||||
if (conn->max_recv_dlength > max) {
|
||||
cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
|
||||
" Need to be <= %u.\n",
|
||||
conn->max_recv_dlength, max);
|
||||
return -EINVAL;
|
||||
}
|
||||
conn->max_recv_dlength = min_t(unsigned int,
|
||||
conn->max_recv_dlength, max);
|
||||
align_pdu_size(conn->max_recv_dlength);
|
||||
} else
|
||||
conn->max_recv_dlength = max;
|
||||
cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
|
||||
conn, conn->max_recv_dlength);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_conn_create - create iscsi connection instance
|
||||
* @cls_session: pointer to iscsi cls session
|
||||
* @cid: iscsi cid
|
||||
*
|
||||
* Creates a new iSCSI connection instance for a given session
|
||||
*/
|
||||
static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
|
||||
*cls_session, u32 cid)
|
||||
{
|
||||
struct iscsi_cls_conn *cls_conn;
|
||||
struct iscsi_conn *conn;
|
||||
struct iscsi_tcp_conn *tcp_conn;
|
||||
struct cxgb3i_conn *cconn;
|
||||
|
||||
cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
|
||||
|
||||
cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
|
||||
if (!cls_conn)
|
||||
return NULL;
|
||||
conn = cls_conn->dd_data;
|
||||
tcp_conn = conn->dd_data;
|
||||
cconn = tcp_conn->dd_data;
|
||||
|
||||
cconn->conn = conn;
|
||||
return cls_conn;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
|
||||
* @cls_session: pointer to iscsi cls session
|
||||
* @cls_conn: pointer to iscsi cls conn
|
||||
* @transport_eph: 64-bit EP handle
|
||||
* @is_leading: leading connection on this session?
|
||||
*
|
||||
* Binds together an iSCSI session, an iSCSI connection and a
|
||||
* TCP connection. This routine returns error code if the TCP
|
||||
* connection does not belong on the device iSCSI sess/conn is bound
|
||||
*/
|
||||
|
||||
static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
|
||||
struct iscsi_cls_conn *cls_conn,
|
||||
u64 transport_eph, int is_leading)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
struct cxgb3i_adapter *snic;
|
||||
struct iscsi_endpoint *ep;
|
||||
struct cxgb3i_endpoint *cep;
|
||||
struct s3_conn *c3cn;
|
||||
int err;
|
||||
|
||||
ep = iscsi_lookup_endpoint(transport_eph);
|
||||
if (!ep)
|
||||
return -EINVAL;
|
||||
|
||||
/* setup ddp pagesize */
|
||||
cep = ep->dd_data;
|
||||
c3cn = cep->c3cn;
|
||||
snic = cep->hba->snic;
|
||||
err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
|
||||
ep, cls_session, cls_conn);
|
||||
|
||||
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
|
||||
if (err)
|
||||
return -EINVAL;
|
||||
|
||||
/* calculate the tag idx bits needed for this conn based on cmds_max */
|
||||
cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
|
||||
cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
|
||||
conn->session->cmds_max, cconn->task_idx_bits);
|
||||
|
||||
read_lock(&c3cn->callback_lock);
|
||||
c3cn->user_data = conn;
|
||||
cconn->hba = cep->hba;
|
||||
cconn->cep = cep;
|
||||
cep->cconn = cconn;
|
||||
read_unlock(&c3cn->callback_lock);
|
||||
|
||||
cxgb3i_conn_max_xmit_dlength(conn);
|
||||
cxgb3i_conn_max_recv_dlength(conn);
|
||||
|
||||
spin_lock_bh(&conn->session->lock);
|
||||
sprintf(conn->portal_address, NIPQUAD_FMT,
|
||||
NIPQUAD(c3cn->daddr.sin_addr.s_addr));
|
||||
conn->portal_port = ntohs(c3cn->daddr.sin_port);
|
||||
spin_unlock_bh(&conn->session->lock);
|
||||
|
||||
/* init recv engine */
|
||||
iscsi_tcp_hdr_recv_prep(tcp_conn);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_conn_get_param - return iscsi connection parameter to caller
|
||||
* @cls_conn: pointer to iscsi cls conn
|
||||
* @param: parameter type identifier
|
||||
* @buf: buffer pointer
|
||||
*
|
||||
* returns iSCSI connection parameters
|
||||
*/
|
||||
static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
||||
enum iscsi_param param, char *buf)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
int len;
|
||||
|
||||
cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
|
||||
|
||||
switch (param) {
|
||||
case ISCSI_PARAM_CONN_PORT:
|
||||
spin_lock_bh(&conn->session->lock);
|
||||
len = sprintf(buf, "%hu\n", conn->portal_port);
|
||||
spin_unlock_bh(&conn->session->lock);
|
||||
break;
|
||||
case ISCSI_PARAM_CONN_ADDRESS:
|
||||
spin_lock_bh(&conn->session->lock);
|
||||
len = sprintf(buf, "%s\n", conn->portal_address);
|
||||
spin_unlock_bh(&conn->session->lock);
|
||||
break;
|
||||
default:
|
||||
return iscsi_conn_get_param(cls_conn, param, buf);
|
||||
}
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_conn_set_param - set iscsi connection parameter
|
||||
* @cls_conn: pointer to iscsi cls conn
|
||||
* @param: parameter type identifier
|
||||
* @buf: buffer pointer
|
||||
* @buflen: buffer length
|
||||
*
|
||||
* set iSCSI connection parameters
|
||||
*/
|
||||
static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
|
||||
enum iscsi_param param, char *buf, int buflen)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
struct iscsi_session *session = conn->session;
|
||||
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
||||
struct s3_conn *c3cn = cconn->cep->c3cn;
|
||||
int value, err = 0;
|
||||
|
||||
switch (param) {
|
||||
case ISCSI_PARAM_HDRDGST_EN:
|
||||
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
||||
if (!err && conn->hdrdgst_en)
|
||||
err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
|
||||
conn->hdrdgst_en,
|
||||
conn->datadgst_en, 0);
|
||||
break;
|
||||
case ISCSI_PARAM_DATADGST_EN:
|
||||
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
||||
if (!err && conn->datadgst_en)
|
||||
err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
|
||||
conn->hdrdgst_en,
|
||||
conn->datadgst_en, 0);
|
||||
break;
|
||||
case ISCSI_PARAM_MAX_R2T:
|
||||
sscanf(buf, "%d", &value);
|
||||
if (value <= 0 || !is_power_of_2(value))
|
||||
return -EINVAL;
|
||||
if (session->max_r2t == value)
|
||||
break;
|
||||
iscsi_tcp_r2tpool_free(session);
|
||||
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
||||
if (!err && iscsi_tcp_r2tpool_alloc(session))
|
||||
return -ENOMEM;
|
||||
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
||||
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
||||
if (!err)
|
||||
err = cxgb3i_conn_max_recv_dlength(conn);
|
||||
break;
|
||||
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
||||
err = iscsi_set_param(cls_conn, param, buf, buflen);
|
||||
if (!err)
|
||||
err = cxgb3i_conn_max_xmit_dlength(conn);
|
||||
break;
|
||||
default:
|
||||
return iscsi_set_param(cls_conn, param, buf, buflen);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_host_set_param - configure host (adapter) related parameters
|
||||
* @shost: scsi host pointer
|
||||
* @param: parameter type identifier
|
||||
* @buf: buffer pointer
|
||||
*/
|
||||
static int cxgb3i_host_set_param(struct Scsi_Host *shost,
|
||||
enum iscsi_host_param param,
|
||||
char *buf, int buflen)
|
||||
{
|
||||
struct cxgb3i_hba *hba = iscsi_host_priv(shost);
|
||||
|
||||
cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
|
||||
|
||||
switch (param) {
|
||||
case ISCSI_HOST_PARAM_IPADDRESS:
|
||||
{
|
||||
__be32 addr = in_aton(buf);
|
||||
cxgb3i_set_private_ipv4addr(hba->ndev, addr);
|
||||
return 0;
|
||||
}
|
||||
case ISCSI_HOST_PARAM_HWADDRESS:
|
||||
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
||||
/* ignore */
|
||||
return 0;
|
||||
default:
|
||||
return iscsi_host_set_param(shost, param, buf, buflen);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_host_get_param - returns host (adapter) related parameters
|
||||
* @shost: scsi host pointer
|
||||
* @param: parameter type identifier
|
||||
* @buf: buffer pointer
|
||||
*/
|
||||
static int cxgb3i_host_get_param(struct Scsi_Host *shost,
|
||||
enum iscsi_host_param param, char *buf)
|
||||
{
|
||||
struct cxgb3i_hba *hba = iscsi_host_priv(shost);
|
||||
int len = 0;
|
||||
|
||||
cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
|
||||
|
||||
switch (param) {
|
||||
case ISCSI_HOST_PARAM_HWADDRESS:
|
||||
len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
|
||||
break;
|
||||
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
||||
len = sprintf(buf, "%s\n", hba->ndev->name);
|
||||
break;
|
||||
case ISCSI_HOST_PARAM_IPADDRESS:
|
||||
{
|
||||
__be32 addr;
|
||||
|
||||
addr = cxgb3i_get_private_ipv4addr(hba->ndev);
|
||||
len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
|
||||
break;
|
||||
}
|
||||
default:
|
||||
return iscsi_host_get_param(shost, param, buf);
|
||||
}
|
||||
return len;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_conn_get_stats - returns iSCSI stats
|
||||
* @cls_conn: pointer to iscsi cls conn
|
||||
* @stats: pointer to iscsi statistic struct
|
||||
*/
|
||||
static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
|
||||
struct iscsi_stats *stats)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
|
||||
stats->txdata_octets = conn->txdata_octets;
|
||||
stats->rxdata_octets = conn->rxdata_octets;
|
||||
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
|
||||
stats->dataout_pdus = conn->dataout_pdus_cnt;
|
||||
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
|
||||
stats->datain_pdus = conn->datain_pdus_cnt;
|
||||
stats->r2t_pdus = conn->r2t_pdus_cnt;
|
||||
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
|
||||
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
|
||||
stats->digest_err = 0;
|
||||
stats->timeout_err = 0;
|
||||
stats->custom_length = 1;
|
||||
strcpy(stats->custom[0].desc, "eh_abort_cnt");
|
||||
stats->custom[0].value = conn->eh_abort_cnt;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_parse_itt - get the idx and age bits from a given tag
|
||||
* @conn: iscsi connection
|
||||
* @itt: itt tag
|
||||
* @idx: task index, filled in by this function
|
||||
* @age: session age, filled in by this function
|
||||
*/
|
||||
static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
|
||||
int *idx, int *age)
|
||||
{
|
||||
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
||||
u32 tag = ntohl((__force u32) itt);
|
||||
u32 sw_bits;
|
||||
|
||||
sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
|
||||
if (idx)
|
||||
*idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
|
||||
if (age)
|
||||
*age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
|
||||
|
||||
cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
|
||||
tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
|
||||
age ? *age : 0xFF);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_reserve_itt - generate tag for a give task
|
||||
* Try to set up ddp for a scsi read task.
|
||||
* @task: iscsi task
|
||||
* @hdr_itt: tag, filled in by this function
|
||||
*/
|
||||
int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
|
||||
{
|
||||
struct scsi_cmnd *sc = task->sc;
|
||||
struct iscsi_conn *conn = task->conn;
|
||||
struct iscsi_session *sess = conn->session;
|
||||
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
||||
struct cxgb3i_tag_format *tformat = &snic->tag_format;
|
||||
u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
|
||||
u32 tag;
|
||||
int err = -EINVAL;
|
||||
|
||||
if (sc &&
|
||||
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
|
||||
cxgb3i_sw_tag_usable(tformat, sw_tag)) {
|
||||
struct s3_conn *c3cn = cconn->cep->c3cn;
|
||||
struct cxgb3i_gather_list *gl;
|
||||
|
||||
gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
|
||||
scsi_in(sc)->table.sgl,
|
||||
scsi_in(sc)->table.nents,
|
||||
snic->pdev,
|
||||
GFP_ATOMIC);
|
||||
if (gl) {
|
||||
tag = sw_tag;
|
||||
err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
|
||||
tformat, &tag,
|
||||
gl, GFP_ATOMIC);
|
||||
if (err < 0)
|
||||
cxgb3i_ddp_release_gl(gl, snic->pdev);
|
||||
}
|
||||
}
|
||||
|
||||
if (err < 0)
|
||||
tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
|
||||
/* the itt need to sent in big-endian order */
|
||||
*hdr_itt = (__force itt_t)htonl(tag);
|
||||
|
||||
cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
|
||||
tag, *hdr_itt, task->itt, sess->age);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_release_itt - release the tag for a given task
|
||||
* if the tag is a ddp tag, release the ddp setup
|
||||
* @task: iscsi task
|
||||
* @hdr_itt: tag
|
||||
*/
|
||||
void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
|
||||
{
|
||||
struct scsi_cmnd *sc = task->sc;
|
||||
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
struct cxgb3i_adapter *snic = cconn->hba->snic;
|
||||
struct cxgb3i_tag_format *tformat = &snic->tag_format;
|
||||
u32 tag = ntohl((__force u32)hdr_itt);
|
||||
|
||||
cxgb3i_tag_debug("release tag 0x%x.\n", tag);
|
||||
|
||||
if (sc &&
|
||||
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
|
||||
cxgb3i_is_ddp_tag(tformat, tag))
|
||||
cxgb3i_ddp_tag_release(snic->tdev, tag);
|
||||
}
|
||||
|
||||
/**
|
||||
* cxgb3i_host_template -- Scsi_Host_Template structure
|
||||
* used when registering with the scsi mid layer
|
||||
*/
|
||||
static struct scsi_host_template cxgb3i_host_template = {
|
||||
.module = THIS_MODULE,
|
||||
.name = "Chelsio S3xx iSCSI Initiator",
|
||||
.proc_name = "cxgb3i",
|
||||
.queuecommand = iscsi_queuecommand,
|
||||
.change_queue_depth = iscsi_change_queue_depth,
|
||||
.can_queue = 128 * (ISCSI_DEF_XMIT_CMDS_MAX - 1),
|
||||
.sg_tablesize = SG_ALL,
|
||||
.max_sectors = 0xFFFF,
|
||||
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
|
||||
.eh_abort_handler = iscsi_eh_abort,
|
||||
.eh_device_reset_handler = iscsi_eh_device_reset,
|
||||
.eh_target_reset_handler = iscsi_eh_target_reset,
|
||||
.use_clustering = DISABLE_CLUSTERING,
|
||||
.this_id = -1,
|
||||
};
|
||||
|
||||
static struct iscsi_transport cxgb3i_iscsi_transport = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "cxgb3i",
|
||||
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
|
||||
| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
|
||||
CAP_PADDING_OFFLOAD,
|
||||
.param_mask = ISCSI_MAX_RECV_DLENGTH |
|
||||
ISCSI_MAX_XMIT_DLENGTH |
|
||||
ISCSI_HDRDGST_EN |
|
||||
ISCSI_DATADGST_EN |
|
||||
ISCSI_INITIAL_R2T_EN |
|
||||
ISCSI_MAX_R2T |
|
||||
ISCSI_IMM_DATA_EN |
|
||||
ISCSI_FIRST_BURST |
|
||||
ISCSI_MAX_BURST |
|
||||
ISCSI_PDU_INORDER_EN |
|
||||
ISCSI_DATASEQ_INORDER_EN |
|
||||
ISCSI_ERL |
|
||||
ISCSI_CONN_PORT |
|
||||
ISCSI_CONN_ADDRESS |
|
||||
ISCSI_EXP_STATSN |
|
||||
ISCSI_PERSISTENT_PORT |
|
||||
ISCSI_PERSISTENT_ADDRESS |
|
||||
ISCSI_TARGET_NAME | ISCSI_TPGT |
|
||||
ISCSI_USERNAME | ISCSI_PASSWORD |
|
||||
ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
|
||||
ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
|
||||
ISCSI_LU_RESET_TMO |
|
||||
ISCSI_PING_TMO | ISCSI_RECV_TMO |
|
||||
ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
|
||||
.host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
|
||||
ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
|
||||
.get_host_param = cxgb3i_host_get_param,
|
||||
.set_host_param = cxgb3i_host_set_param,
|
||||
/* session management */
|
||||
.create_session = cxgb3i_session_create,
|
||||
.destroy_session = cxgb3i_session_destroy,
|
||||
.get_session_param = iscsi_session_get_param,
|
||||
/* connection management */
|
||||
.create_conn = cxgb3i_conn_create,
|
||||
.bind_conn = cxgb3i_conn_bind,
|
||||
.destroy_conn = iscsi_tcp_conn_teardown,
|
||||
.start_conn = iscsi_conn_start,
|
||||
.stop_conn = iscsi_conn_stop,
|
||||
.get_conn_param = cxgb3i_conn_get_param,
|
||||
.set_param = cxgb3i_conn_set_param,
|
||||
.get_stats = cxgb3i_conn_get_stats,
|
||||
/* pdu xmit req. from user space */
|
||||
.send_pdu = iscsi_conn_send_pdu,
|
||||
/* task */
|
||||
.init_task = iscsi_tcp_task_init,
|
||||
.xmit_task = iscsi_tcp_task_xmit,
|
||||
.cleanup_task = cxgb3i_conn_cleanup_task,
|
||||
|
||||
/* pdu */
|
||||
.alloc_pdu = cxgb3i_conn_alloc_pdu,
|
||||
.init_pdu = cxgb3i_conn_init_pdu,
|
||||
.xmit_pdu = cxgb3i_conn_xmit_pdu,
|
||||
.parse_pdu_itt = cxgb3i_parse_itt,
|
||||
|
||||
/* TCP connect/disconnect */
|
||||
.ep_connect = cxgb3i_ep_connect,
|
||||
.ep_poll = cxgb3i_ep_poll,
|
||||
.ep_disconnect = cxgb3i_ep_disconnect,
|
||||
/* Error recovery timeout call */
|
||||
.session_recovery_timedout = iscsi_session_recovery_timedout,
|
||||
};
|
||||
|
||||
int cxgb3i_iscsi_init(void)
|
||||
{
|
||||
sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
|
||||
sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
|
||||
cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
|
||||
ISCSI_ITT_MASK, sw_tag_idx_bits,
|
||||
ISCSI_AGE_MASK, sw_tag_age_bits);
|
||||
|
||||
cxgb3i_scsi_transport =
|
||||
iscsi_register_transport(&cxgb3i_iscsi_transport);
|
||||
if (!cxgb3i_scsi_transport) {
|
||||
cxgb3i_log_error("Could not register cxgb3i transport.\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void cxgb3i_iscsi_cleanup(void)
|
||||
{
|
||||
if (cxgb3i_scsi_transport) {
|
||||
cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
|
||||
cxgb3i_scsi_transport);
|
||||
iscsi_unregister_transport(&cxgb3i_iscsi_transport);
|
||||
}
|
||||
}
|
||||
1810
drivers/scsi/cxgb3i/cxgb3i_offload.c
Normal file
1810
drivers/scsi/cxgb3i/cxgb3i_offload.c
Normal file
File diff suppressed because it is too large
Load diff
231
drivers/scsi/cxgb3i/cxgb3i_offload.h
Normal file
231
drivers/scsi/cxgb3i/cxgb3i_offload.h
Normal file
|
|
@ -0,0 +1,231 @@
|
|||
/*
|
||||
* cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
|
||||
*
|
||||
* Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
|
||||
* release for licensing terms and conditions.
|
||||
*
|
||||
* Written by: Dimitris Michailidis (dm@chelsio.com)
|
||||
* Karen Xie (kxie@chelsio.com)
|
||||
*/
|
||||
|
||||
#ifndef _CXGB3I_OFFLOAD_H
|
||||
#define _CXGB3I_OFFLOAD_H
|
||||
|
||||
#include <linux/skbuff.h>
|
||||
#include <net/tcp.h>
|
||||
|
||||
#include "common.h"
|
||||
#include "adapter.h"
|
||||
#include "t3cdev.h"
|
||||
#include "cxgb3_offload.h"
|
||||
|
||||
#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
|
||||
#define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
|
||||
#define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
|
||||
#define cxgb3i_log_debug(fmt, args...) \
|
||||
printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
|
||||
|
||||
/**
|
||||
* struct s3_conn - an iscsi tcp connection structure
|
||||
*
|
||||
* @dev: net device of with connection
|
||||
* @cdev: adapter t3cdev for net device
|
||||
* @flags: see c3cn_flags below
|
||||
* @tid: connection id assigned by the h/w
|
||||
* @qset: queue set used by connection
|
||||
* @mss_idx: Maximum Segment Size table index
|
||||
* @l2t: ARP resolution entry for offload packets
|
||||
* @wr_max: maximum in-flight writes
|
||||
* @wr_avail: number of writes available
|
||||
* @wr_unacked: writes since last request for completion notification
|
||||
* @wr_pending_head: head of pending write queue
|
||||
* @wr_pending_tail: tail of pending write queue
|
||||
* @cpl_close: skb for cpl_close_req
|
||||
* @cpl_abort_req: skb for cpl_abort_req
|
||||
* @cpl_abort_rpl: skb for cpl_abort_rpl
|
||||
* @lock: connection status lock
|
||||
* @refcnt: reference count on connection
|
||||
* @state: connection state
|
||||
* @saddr: source ip/port address
|
||||
* @daddr: destination ip/port address
|
||||
* @dst_cache: reference to destination route
|
||||
* @receive_queue: received PDUs
|
||||
* @write_queue: un-pushed pending writes
|
||||
* @retry_timer: retry timer for various operations
|
||||
* @err: connection error status
|
||||
* @callback_lock: lock for opaque user context
|
||||
* @user_data: opaque user context
|
||||
* @rcv_nxt: next receive seq. #
|
||||
* @copied_seq: head of yet unread data
|
||||
* @rcv_wup: rcv_nxt on last window update sent
|
||||
* @snd_nxt: next sequence we send
|
||||
* @snd_una: first byte we want an ack for
|
||||
* @write_seq: tail+1 of data held in send buffer
|
||||
*/
|
||||
struct s3_conn {
|
||||
struct net_device *dev;
|
||||
struct t3cdev *cdev;
|
||||
unsigned long flags;
|
||||
int tid;
|
||||
int qset;
|
||||
int mss_idx;
|
||||
struct l2t_entry *l2t;
|
||||
int wr_max;
|
||||
int wr_avail;
|
||||
int wr_unacked;
|
||||
struct sk_buff *wr_pending_head;
|
||||
struct sk_buff *wr_pending_tail;
|
||||
struct sk_buff *cpl_close;
|
||||
struct sk_buff *cpl_abort_req;
|
||||
struct sk_buff *cpl_abort_rpl;
|
||||
spinlock_t lock;
|
||||
atomic_t refcnt;
|
||||
volatile unsigned int state;
|
||||
struct sockaddr_in saddr;
|
||||
struct sockaddr_in daddr;
|
||||
struct dst_entry *dst_cache;
|
||||
struct sk_buff_head receive_queue;
|
||||
struct sk_buff_head write_queue;
|
||||
struct timer_list retry_timer;
|
||||
int err;
|
||||
rwlock_t callback_lock;
|
||||
void *user_data;
|
||||
|
||||
u32 rcv_nxt;
|
||||
u32 copied_seq;
|
||||
u32 rcv_wup;
|
||||
u32 snd_nxt;
|
||||
u32 snd_una;
|
||||
u32 write_seq;
|
||||
};
|
||||
|
||||
/*
|
||||
* connection state
|
||||
*/
|
||||
enum conn_states {
|
||||
C3CN_STATE_CONNECTING = 1,
|
||||
C3CN_STATE_ESTABLISHED,
|
||||
C3CN_STATE_ACTIVE_CLOSE,
|
||||
C3CN_STATE_PASSIVE_CLOSE,
|
||||
C3CN_STATE_CLOSE_WAIT_1,
|
||||
C3CN_STATE_CLOSE_WAIT_2,
|
||||
C3CN_STATE_ABORTING,
|
||||
C3CN_STATE_CLOSED,
|
||||
};
|
||||
|
||||
static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
|
||||
{
|
||||
return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
|
||||
}
|
||||
static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
|
||||
{
|
||||
return c3cn->state == C3CN_STATE_ESTABLISHED;
|
||||
}
|
||||
|
||||
/*
|
||||
* Connection flags -- many to track some close related events.
|
||||
*/
|
||||
enum c3cn_flags {
|
||||
C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
|
||||
C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
|
||||
C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
|
||||
C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
|
||||
C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
|
||||
};
|
||||
|
||||
/**
|
||||
* cxgb3i_sdev_data - Per adapter data.
|
||||
* Linked off of each Ethernet device port on the adapter.
|
||||
* Also available via the t3cdev structure since we have pointers to our port
|
||||
* net_device's there ...
|
||||
*
|
||||
* @list: list head to link elements
|
||||
* @cdev: t3cdev adapter
|
||||
* @client: CPL client pointer
|
||||
* @ports: array of adapter ports
|
||||
* @sport_map_next: next index into the port map
|
||||
* @sport_map: source port map
|
||||
*/
|
||||
struct cxgb3i_sdev_data {
|
||||
struct list_head list;
|
||||
struct t3cdev *cdev;
|
||||
struct cxgb3_client *client;
|
||||
struct adap_ports ports;
|
||||
unsigned int sport_map_next;
|
||||
unsigned long sport_map[0];
|
||||
};
|
||||
#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
|
||||
#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
|
||||
|
||||
void cxgb3i_sdev_cleanup(void);
|
||||
int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
|
||||
void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
|
||||
void cxgb3i_sdev_remove(struct t3cdev *);
|
||||
|
||||
struct s3_conn *cxgb3i_c3cn_create(void);
|
||||
int cxgb3i_c3cn_connect(struct s3_conn *, struct sockaddr_in *);
|
||||
void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
|
||||
int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
|
||||
void cxgb3i_c3cn_release(struct s3_conn *);
|
||||
|
||||
/**
|
||||
* cxgb3_skb_cb - control block for received pdu state and ULP mode management.
|
||||
*
|
||||
* @flag: see C3CB_FLAG_* below
|
||||
* @ulp_mode: ULP mode/submode of sk_buff
|
||||
* @seq: tcp sequence number
|
||||
* @ddigest: pdu data digest
|
||||
* @pdulen: recovered pdu length
|
||||
* @ulp_data: scratch area for ULP
|
||||
*/
|
||||
struct cxgb3_skb_cb {
|
||||
__u8 flags;
|
||||
__u8 ulp_mode;
|
||||
__u32 seq;
|
||||
__u32 ddigest;
|
||||
__u32 pdulen;
|
||||
__u8 ulp_data[16];
|
||||
};
|
||||
|
||||
#define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
|
||||
|
||||
#define skb_ulp_mode(skb) (CXGB3_SKB_CB(skb)->ulp_mode)
|
||||
#define skb_ulp_ddigest(skb) (CXGB3_SKB_CB(skb)->ddigest)
|
||||
#define skb_ulp_pdulen(skb) (CXGB3_SKB_CB(skb)->pdulen)
|
||||
#define skb_ulp_data(skb) (CXGB3_SKB_CB(skb)->ulp_data)
|
||||
|
||||
enum c3cb_flags {
|
||||
C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
|
||||
C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
|
||||
C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
|
||||
};
|
||||
|
||||
/**
|
||||
* sge_opaque_hdr -
|
||||
* Opaque version of structure the SGE stores at skb->head of TX_DATA packets
|
||||
* and for which we must reserve space.
|
||||
*/
|
||||
struct sge_opaque_hdr {
|
||||
void *dev;
|
||||
dma_addr_t addr[MAX_SKB_FRAGS + 1];
|
||||
};
|
||||
|
||||
/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
|
||||
#define TX_HEADER_LEN \
|
||||
(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
|
||||
|
||||
/*
|
||||
* get and set private ip for iscsi traffic
|
||||
*/
|
||||
#define cxgb3i_get_private_ipv4addr(ndev) \
|
||||
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
|
||||
#define cxgb3i_set_private_ipv4addr(ndev, addr) \
|
||||
(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
|
||||
|
||||
/* max. connections per adapter */
|
||||
#define CXGB3I_MAX_CONN 16384
|
||||
#endif /* _CXGB3_OFFLOAD_H */
|
||||
402
drivers/scsi/cxgb3i/cxgb3i_pdu.c
Normal file
402
drivers/scsi/cxgb3i/cxgb3i_pdu.c
Normal file
|
|
@ -0,0 +1,402 @@
|
|||
/*
|
||||
* cxgb3i_pdu.c: Chelsio S3xx iSCSI driver.
|
||||
*
|
||||
* Copyright (c) 2008 Chelsio Communications, Inc.
|
||||
* Copyright (c) 2008 Mike Christie
|
||||
* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation.
|
||||
*
|
||||
* Written by: Karen Xie (kxie@chelsio.com)
|
||||
*/
|
||||
|
||||
#include <linux/skbuff.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <scsi/scsi_cmnd.h>
|
||||
#include <scsi/scsi_host.h>
|
||||
|
||||
#include "cxgb3i.h"
|
||||
#include "cxgb3i_pdu.h"
|
||||
|
||||
#ifdef __DEBUG_CXGB3I_RX__
|
||||
#define cxgb3i_rx_debug cxgb3i_log_debug
|
||||
#else
|
||||
#define cxgb3i_rx_debug(fmt...)
|
||||
#endif
|
||||
|
||||
#ifdef __DEBUG_CXGB3I_TX__
|
||||
#define cxgb3i_tx_debug cxgb3i_log_debug
|
||||
#else
|
||||
#define cxgb3i_tx_debug(fmt...)
|
||||
#endif
|
||||
|
||||
static struct page *pad_page;
|
||||
|
||||
/*
|
||||
* pdu receive, interact with libiscsi_tcp
|
||||
*/
|
||||
static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb,
|
||||
unsigned int offset, int offloaded)
|
||||
{
|
||||
int status = 0;
|
||||
int bytes_read;
|
||||
|
||||
bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
|
||||
switch (status) {
|
||||
case ISCSI_TCP_CONN_ERR:
|
||||
return -EIO;
|
||||
case ISCSI_TCP_SUSPENDED:
|
||||
/* no transfer - just have caller flush queue */
|
||||
return bytes_read;
|
||||
case ISCSI_TCP_SKB_DONE:
|
||||
/*
|
||||
* pdus should always fit in the skb and we should get
|
||||
* segment done notifcation.
|
||||
*/
|
||||
iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
|
||||
return -EFAULT;
|
||||
case ISCSI_TCP_SEGMENT_DONE:
|
||||
return bytes_read;
|
||||
default:
|
||||
iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb "
|
||||
"status %d\n", status);
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn,
|
||||
struct sk_buff *skb)
|
||||
{
|
||||
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
|
||||
bool offloaded = 0;
|
||||
unsigned int offset;
|
||||
int rc;
|
||||
|
||||
cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n",
|
||||
conn, skb, skb->len, skb_ulp_mode(skb));
|
||||
|
||||
if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
|
||||
iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) {
|
||||
iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) {
|
||||
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
/* iscsi hdr */
|
||||
rc = read_pdu_skb(conn, skb, 0, 0);
|
||||
if (rc <= 0)
|
||||
return rc;
|
||||
|
||||
if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
|
||||
return 0;
|
||||
|
||||
offset = rc;
|
||||
if (conn->hdrdgst_en)
|
||||
offset += ISCSI_DIGEST_SIZE;
|
||||
|
||||
/* iscsi data */
|
||||
if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) {
|
||||
cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, "
|
||||
"itt 0x%x.\n",
|
||||
skb,
|
||||
tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
|
||||
tcp_conn->in.datalen,
|
||||
ntohl(tcp_conn->in.hdr->itt));
|
||||
offloaded = 1;
|
||||
} else {
|
||||
cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, "
|
||||
"itt 0x%x.\n",
|
||||
skb,
|
||||
tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
|
||||
tcp_conn->in.datalen,
|
||||
ntohl(tcp_conn->in.hdr->itt));
|
||||
offset += sizeof(struct cpl_iscsi_hdr_norss);
|
||||
}
|
||||
|
||||
rc = read_pdu_skb(conn, skb, offset, offloaded);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* pdu transmit, interact with libiscsi_tcp
|
||||
*/
|
||||
static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
|
||||
{
|
||||
u8 submode = 0;
|
||||
|
||||
if (hcrc)
|
||||
submode |= 1;
|
||||
if (dcrc)
|
||||
submode |= 2;
|
||||
skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode;
|
||||
}
|
||||
|
||||
void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
|
||||
{
|
||||
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
||||
|
||||
/* never reached the xmit task callout */
|
||||
if (tcp_task->dd_data)
|
||||
kfree_skb(tcp_task->dd_data);
|
||||
tcp_task->dd_data = NULL;
|
||||
|
||||
/* MNC - Do we need a check in case this is called but
|
||||
* cxgb3i_conn_alloc_pdu has never been called on the task */
|
||||
cxgb3i_release_itt(task, task->hdr_itt);
|
||||
iscsi_tcp_cleanup_task(task);
|
||||
}
|
||||
|
||||
/*
|
||||
* We do not support ahs yet
|
||||
*/
|
||||
int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
|
||||
{
|
||||
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
||||
struct sk_buff *skb;
|
||||
|
||||
task->hdr = NULL;
|
||||
/* always allocate rooms for AHS */
|
||||
skb = alloc_skb(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE +
|
||||
TX_HEADER_LEN, GFP_ATOMIC);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n",
|
||||
task, opcode, skb);
|
||||
|
||||
tcp_task->dd_data = skb;
|
||||
skb_reserve(skb, TX_HEADER_LEN);
|
||||
task->hdr = (struct iscsi_hdr *)skb->data;
|
||||
task->hdr_max = sizeof(struct iscsi_hdr);
|
||||
|
||||
/* data_out uses scsi_cmd's itt */
|
||||
if (opcode != ISCSI_OP_SCSI_DATA_OUT)
|
||||
cxgb3i_reserve_itt(task, &task->hdr->itt);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
|
||||
unsigned int count)
|
||||
{
|
||||
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
||||
struct sk_buff *skb = tcp_task->dd_data;
|
||||
struct iscsi_conn *conn = task->conn;
|
||||
struct page *pg;
|
||||
unsigned int datalen = count;
|
||||
int i, padlen = iscsi_padding(count);
|
||||
skb_frag_t *frag;
|
||||
|
||||
cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n",
|
||||
task, task->sc, offset, count, skb);
|
||||
|
||||
skb_put(skb, task->hdr_len);
|
||||
tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
|
||||
if (!count)
|
||||
return 0;
|
||||
|
||||
if (task->sc) {
|
||||
struct scatterlist *sg;
|
||||
struct scsi_data_buffer *sdb;
|
||||
unsigned int sgoffset = offset;
|
||||
struct page *sgpg;
|
||||
unsigned int sglen;
|
||||
|
||||
sdb = scsi_out(task->sc);
|
||||
sg = sdb->table.sgl;
|
||||
|
||||
for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
|
||||
cxgb3i_tx_debug("sg %d, page 0x%p, len %u offset %u\n",
|
||||
i, sg_page(sg), sg->length, sg->offset);
|
||||
|
||||
if (sgoffset < sg->length)
|
||||
break;
|
||||
sgoffset -= sg->length;
|
||||
}
|
||||
sgpg = sg_page(sg);
|
||||
sglen = sg->length - sgoffset;
|
||||
|
||||
do {
|
||||
int j = skb_shinfo(skb)->nr_frags;
|
||||
unsigned int copy;
|
||||
|
||||
if (!sglen) {
|
||||
sg = sg_next(sg);
|
||||
sgpg = sg_page(sg);
|
||||
sgoffset = 0;
|
||||
sglen = sg->length;
|
||||
++i;
|
||||
}
|
||||
copy = min(sglen, datalen);
|
||||
if (j && skb_can_coalesce(skb, j, sgpg,
|
||||
sg->offset + sgoffset)) {
|
||||
skb_shinfo(skb)->frags[j - 1].size += copy;
|
||||
} else {
|
||||
get_page(sgpg);
|
||||
skb_fill_page_desc(skb, j, sgpg,
|
||||
sg->offset + sgoffset, copy);
|
||||
}
|
||||
sgoffset += copy;
|
||||
sglen -= copy;
|
||||
datalen -= copy;
|
||||
} while (datalen);
|
||||
} else {
|
||||
pg = virt_to_page(task->data);
|
||||
|
||||
while (datalen) {
|
||||
i = skb_shinfo(skb)->nr_frags;
|
||||
frag = &skb_shinfo(skb)->frags[i];
|
||||
|
||||
get_page(pg);
|
||||
frag->page = pg;
|
||||
frag->page_offset = 0;
|
||||
frag->size = min((unsigned int)PAGE_SIZE, datalen);
|
||||
|
||||
skb_shinfo(skb)->nr_frags++;
|
||||
datalen -= frag->size;
|
||||
pg++;
|
||||
}
|
||||
}
|
||||
|
||||
if (padlen) {
|
||||
i = skb_shinfo(skb)->nr_frags;
|
||||
frag = &skb_shinfo(skb)->frags[i];
|
||||
frag->page = pad_page;
|
||||
frag->page_offset = 0;
|
||||
frag->size = padlen;
|
||||
skb_shinfo(skb)->nr_frags++;
|
||||
}
|
||||
|
||||
datalen = count + padlen;
|
||||
skb->data_len += datalen;
|
||||
skb->truesize += datalen;
|
||||
skb->len += datalen;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
|
||||
{
|
||||
struct iscsi_tcp_task *tcp_task = task->dd_data;
|
||||
struct sk_buff *skb = tcp_task->dd_data;
|
||||
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
|
||||
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
|
||||
unsigned int datalen;
|
||||
int err;
|
||||
|
||||
if (!skb)
|
||||
return 0;
|
||||
|
||||
datalen = skb->data_len;
|
||||
tcp_task->dd_data = NULL;
|
||||
err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
|
||||
cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
|
||||
task, skb, skb->len, skb->data_len, err);
|
||||
if (err > 0) {
|
||||
int pdulen = err;
|
||||
|
||||
if (task->conn->hdrdgst_en)
|
||||
pdulen += ISCSI_DIGEST_SIZE;
|
||||
if (datalen && task->conn->datadgst_en)
|
||||
pdulen += ISCSI_DIGEST_SIZE;
|
||||
|
||||
task->conn->txdata_octets += pdulen;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (err < 0 && err != -EAGAIN) {
|
||||
kfree_skb(skb);
|
||||
cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
|
||||
task->itt, skb, skb->len, skb->data_len, err);
|
||||
iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
|
||||
iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
|
||||
return err;
|
||||
}
|
||||
/* reset skb to send when we are called again */
|
||||
tcp_task->dd_data = skb;
|
||||
return -EAGAIN;
|
||||
}
|
||||
|
||||
int cxgb3i_pdu_init(void)
|
||||
{
|
||||
pad_page = alloc_page(GFP_KERNEL);
|
||||
if (!pad_page)
|
||||
return -ENOMEM;
|
||||
memset(page_address(pad_page), 0, PAGE_SIZE);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void cxgb3i_pdu_cleanup(void)
|
||||
{
|
||||
if (pad_page) {
|
||||
__free_page(pad_page);
|
||||
pad_page = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
|
||||
{
|
||||
struct sk_buff *skb;
|
||||
unsigned int read = 0;
|
||||
struct iscsi_conn *conn = c3cn->user_data;
|
||||
int err = 0;
|
||||
|
||||
cxgb3i_rx_debug("cn 0x%p.\n", c3cn);
|
||||
|
||||
read_lock(&c3cn->callback_lock);
|
||||
if (unlikely(!conn || conn->suspend_rx)) {
|
||||
cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n",
|
||||
conn, conn ? conn->id : 0xFF,
|
||||
conn ? conn->suspend_rx : 0xFF);
|
||||
read_unlock(&c3cn->callback_lock);
|
||||
return;
|
||||
}
|
||||
skb = skb_peek(&c3cn->receive_queue);
|
||||
while (!err && skb) {
|
||||
__skb_unlink(skb, &c3cn->receive_queue);
|
||||
read += skb_ulp_pdulen(skb);
|
||||
err = cxgb3i_conn_read_pdu_skb(conn, skb);
|
||||
__kfree_skb(skb);
|
||||
skb = skb_peek(&c3cn->receive_queue);
|
||||
}
|
||||
read_unlock(&c3cn->callback_lock);
|
||||
if (c3cn) {
|
||||
c3cn->copied_seq += read;
|
||||
cxgb3i_c3cn_rx_credits(c3cn, read);
|
||||
}
|
||||
conn->rxdata_octets += read;
|
||||
}
|
||||
|
||||
void cxgb3i_conn_tx_open(struct s3_conn *c3cn)
|
||||
{
|
||||
struct iscsi_conn *conn = c3cn->user_data;
|
||||
|
||||
cxgb3i_tx_debug("cn 0x%p.\n", c3cn);
|
||||
if (conn) {
|
||||
cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id);
|
||||
scsi_queue_work(conn->session->host, &conn->xmitwork);
|
||||
}
|
||||
}
|
||||
|
||||
void cxgb3i_conn_closing(struct s3_conn *c3cn)
|
||||
{
|
||||
struct iscsi_conn *conn;
|
||||
|
||||
read_lock(&c3cn->callback_lock);
|
||||
conn = c3cn->user_data;
|
||||
if (conn && c3cn->state != C3CN_STATE_ESTABLISHED)
|
||||
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
||||
read_unlock(&c3cn->callback_lock);
|
||||
}
|
||||
59
drivers/scsi/cxgb3i/cxgb3i_pdu.h
Normal file
59
drivers/scsi/cxgb3i/cxgb3i_pdu.h
Normal file
|
|
@ -0,0 +1,59 @@
|
|||
/*
|
||||
* cxgb3i_ulp2.h: Chelsio S3xx iSCSI driver.
|
||||
*
|
||||
* Copyright (c) 2008 Chelsio Communications, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation.
|
||||
*
|
||||
* Written by: Karen Xie (kxie@chelsio.com)
|
||||
*/
|
||||
|
||||
#ifndef __CXGB3I_ULP2_PDU_H__
|
||||
#define __CXGB3I_ULP2_PDU_H__
|
||||
|
||||
struct cpl_iscsi_hdr_norss {
|
||||
union opcode_tid ot;
|
||||
u16 pdu_len_ddp;
|
||||
u16 len;
|
||||
u32 seq;
|
||||
u16 urg;
|
||||
u8 rsvd;
|
||||
u8 status;
|
||||
};
|
||||
|
||||
struct cpl_rx_data_ddp_norss {
|
||||
union opcode_tid ot;
|
||||
u16 urg;
|
||||
u16 len;
|
||||
u32 seq;
|
||||
u32 nxt_seq;
|
||||
u32 ulp_crc;
|
||||
u32 ddp_status;
|
||||
};
|
||||
|
||||
#define RX_DDP_STATUS_IPP_SHIFT 27 /* invalid pagepod */
|
||||
#define RX_DDP_STATUS_TID_SHIFT 26 /* tid mismatch */
|
||||
#define RX_DDP_STATUS_COLOR_SHIFT 25 /* color mismatch */
|
||||
#define RX_DDP_STATUS_OFFSET_SHIFT 24 /* offset mismatch */
|
||||
#define RX_DDP_STATUS_ULIMIT_SHIFT 23 /* ulimit error */
|
||||
#define RX_DDP_STATUS_TAG_SHIFT 22 /* tag mismatch */
|
||||
#define RX_DDP_STATUS_DCRC_SHIFT 21 /* dcrc error */
|
||||
#define RX_DDP_STATUS_HCRC_SHIFT 20 /* hcrc error */
|
||||
#define RX_DDP_STATUS_PAD_SHIFT 19 /* pad error */
|
||||
#define RX_DDP_STATUS_PPP_SHIFT 18 /* pagepod parity error */
|
||||
#define RX_DDP_STATUS_LLIMIT_SHIFT 17 /* llimit error */
|
||||
#define RX_DDP_STATUS_DDP_SHIFT 16 /* ddp'able */
|
||||
#define RX_DDP_STATUS_PMM_SHIFT 15 /* pagepod mismatch */
|
||||
|
||||
#define ULP2_FLAG_DATA_READY 0x1
|
||||
#define ULP2_FLAG_DATA_DDPED 0x2
|
||||
#define ULP2_FLAG_HCRC_ERROR 0x10
|
||||
#define ULP2_FLAG_DCRC_ERROR 0x20
|
||||
#define ULP2_FLAG_PAD_ERROR 0x40
|
||||
|
||||
void cxgb3i_conn_closing(struct s3_conn *);
|
||||
void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn);
|
||||
void cxgb3i_conn_tx_open(struct s3_conn *c3cn);
|
||||
#endif
|
||||
Loading…
Reference in a new issue