[IA64-SGI] SGI Altix cross partition functionality [3/3]
This patch contains the cross partition pseudo-ethernet driver (XPNET) functional support module. Signed-off-by: Dean Nelson <dcn@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Dean Nelson
Tony Luck
parent
89eb8eb927
commit
a2d974da0a
2 changed files with 716 additions and 0 deletions
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@ -15,3 +15,4 @@ obj-$(CONFIG_IA64_SGI_SN_XP) += xp.o
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xp-y := xp_main.o xp_nofault.o
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obj-$(CONFIG_IA64_SGI_SN_XP) += xpc.o
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xpc-y := xpc_main.o xpc_channel.o xpc_partition.o
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obj-$(CONFIG_IA64_SGI_SN_XP) += xpnet.o
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715
arch/ia64/sn/kernel/xpnet.c
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715
arch/ia64/sn/kernel/xpnet.c
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@ -0,0 +1,715 @@
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1999,2001-2005 Silicon Graphics, Inc. All rights reserved.
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*/
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/*
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* Cross Partition Network Interface (XPNET) support
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*
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* XPNET provides a virtual network layered on top of the Cross
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* Partition communication layer.
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*
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* XPNET provides direct point-to-point and broadcast-like support
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* for an ethernet-like device. The ethernet broadcast medium is
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* replaced with a point-to-point message structure which passes
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* pointers to a DMA-capable block that a remote partition should
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* retrieve and pass to the upper level networking layer.
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/delay.h>
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#include <linux/ethtool.h>
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#include <linux/mii.h>
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#include <linux/smp.h>
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#include <linux/string.h>
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#include <asm/sn/bte.h>
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#include <asm/sn/io.h>
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#include <asm/sn/sn_sal.h>
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#include <asm/types.h>
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#include <asm/atomic.h>
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#include <asm/sn/xp.h>
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/*
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* The message payload transferred by XPC.
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*
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* buf_pa is the physical address where the DMA should pull from.
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*
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* NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a
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* cacheline boundary. To accomplish this, we record the number of
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* bytes from the beginning of the first cacheline to the first useful
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* byte of the skb (leadin_ignore) and the number of bytes from the
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* last useful byte of the skb to the end of the last cacheline
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* (tailout_ignore).
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*
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* size is the number of bytes to transfer which includes the skb->len
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* (useful bytes of the senders skb) plus the leadin and tailout
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*/
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struct xpnet_message {
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u16 version; /* Version for this message */
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u16 embedded_bytes; /* #of bytes embedded in XPC message */
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u32 magic; /* Special number indicating this is xpnet */
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u64 buf_pa; /* phys address of buffer to retrieve */
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u32 size; /* #of bytes in buffer */
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u8 leadin_ignore; /* #of bytes to ignore at the beginning */
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u8 tailout_ignore; /* #of bytes to ignore at the end */
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unsigned char data; /* body of small packets */
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};
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/*
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* Determine the size of our message, the cacheline aligned size,
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* and then the number of message will request from XPC.
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*
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* XPC expects each message to exist in an individual cacheline.
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*/
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#define XPNET_MSG_SIZE (L1_CACHE_BYTES - XPC_MSG_PAYLOAD_OFFSET)
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#define XPNET_MSG_DATA_MAX \
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(XPNET_MSG_SIZE - (u64)(&((struct xpnet_message *)0)->data))
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#define XPNET_MSG_ALIGNED_SIZE (L1_CACHE_ALIGN(XPNET_MSG_SIZE))
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#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPNET_MSG_ALIGNED_SIZE)
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#define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1)
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#define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1)
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/*
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* Version number of XPNET implementation. XPNET can always talk to versions
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* with same major #, and never talk to versions with a different version.
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*/
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#define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor))
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#define XPNET_VERSION_MAJOR(_v) ((_v) >> 4)
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#define XPNET_VERSION_MINOR(_v) ((_v) & 0xf)
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#define XPNET_VERSION _XPNET_VERSION(1,0) /* version 1.0 */
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#define XPNET_VERSION_EMBED _XPNET_VERSION(1,1) /* version 1.1 */
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#define XPNET_MAGIC 0x88786984 /* "XNET" */
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#define XPNET_VALID_MSG(_m) \
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((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \
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&& (msg->magic == XPNET_MAGIC))
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#define XPNET_DEVICE_NAME "xp0"
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/*
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* When messages are queued with xpc_send_notify, a kmalloc'd buffer
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* of the following type is passed as a notification cookie. When the
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* notification function is called, we use the cookie to decide
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* whether all outstanding message sends have completed. The skb can
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* then be released.
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*/
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struct xpnet_pending_msg {
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struct list_head free_list;
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struct sk_buff *skb;
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atomic_t use_count;
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};
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/* driver specific structure pointed to by the device structure */
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struct xpnet_dev_private {
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struct net_device_stats stats;
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};
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struct net_device *xpnet_device;
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/*
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* When we are notified of other partitions activating, we add them to
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* our bitmask of partitions to which we broadcast.
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*/
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static u64 xpnet_broadcast_partitions;
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/* protect above */
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static spinlock_t xpnet_broadcast_lock = SPIN_LOCK_UNLOCKED;
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/*
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* Since the Block Transfer Engine (BTE) is being used for the transfer
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* and it relies upon cache-line size transfers, we need to reserve at
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* least one cache-line for head and tail alignment. The BTE is
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* limited to 8MB transfers.
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*
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* Testing has shown that changing MTU to greater than 64KB has no effect
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* on TCP as the two sides negotiate a Max Segment Size that is limited
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* to 64K. Other protocols May use packets greater than this, but for
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* now, the default is 64KB.
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*/
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#define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
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/* 32KB has been determined to be the ideal */
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#define XPNET_DEF_MTU (0x8000UL)
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/*
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* The partition id is encapsulated in the MAC address. The following
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* define locates the octet the partid is in.
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*/
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#define XPNET_PARTID_OCTET 1
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#define XPNET_LICENSE_OCTET 2
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/*
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* Define the XPNET debug device structure that is to be used with dev_dbg(),
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* dev_err(), dev_warn(), and dev_info().
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*/
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struct device_driver xpnet_dbg_name = {
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.name = "xpnet"
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};
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struct device xpnet_dbg_subname = {
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.bus_id = {0}, /* set to "" */
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.driver = &xpnet_dbg_name
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};
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struct device *xpnet = &xpnet_dbg_subname;
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/*
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* Packet was recevied by XPC and forwarded to us.
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*/
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static void
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xpnet_receive(partid_t partid, int channel, struct xpnet_message *msg)
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{
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struct sk_buff *skb;
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bte_result_t bret;
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struct xpnet_dev_private *priv =
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(struct xpnet_dev_private *) xpnet_device->priv;
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if (!XPNET_VALID_MSG(msg)) {
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/*
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* Packet with a different XPC version. Ignore.
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*/
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xpc_received(partid, channel, (void *) msg);
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priv->stats.rx_errors++;
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return;
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}
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dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size,
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msg->leadin_ignore, msg->tailout_ignore);
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/* reserve an extra cache line */
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skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES);
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if (!skb) {
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dev_err(xpnet, "failed on dev_alloc_skb(%d)\n",
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msg->size + L1_CACHE_BYTES);
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xpc_received(partid, channel, (void *) msg);
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priv->stats.rx_errors++;
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return;
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}
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/*
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* The allocated skb has some reserved space.
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* In order to use bte_copy, we need to get the
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* skb->data pointer moved forward.
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*/
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skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &
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(L1_CACHE_BYTES - 1)) +
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msg->leadin_ignore));
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/*
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* Update the tail pointer to indicate data actually
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* transferred.
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*/
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skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore));
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/*
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* Move the data over from the the other side.
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*/
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if ((XPNET_VERSION_MINOR(msg->version) == 1) &&
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(msg->embedded_bytes != 0)) {
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dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, "
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"%lu)\n", skb->data, &msg->data,
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(size_t) msg->embedded_bytes);
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memcpy(skb->data, &msg->data, (size_t) msg->embedded_bytes);
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} else {
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dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"
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"bte_copy(0x%p, 0x%p, %hu)\n", (void *)msg->buf_pa,
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(void *)__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
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msg->size);
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bret = bte_copy(msg->buf_pa,
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__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
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msg->size, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
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if (bret != BTE_SUCCESS) {
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// >>> Need better way of cleaning skb. Currently skb
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// >>> appears in_use and we can't just call
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// >>> dev_kfree_skb.
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dev_err(xpnet, "bte_copy(0x%p, 0x%p, 0x%hx) returned "
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"error=0x%x\n", (void *)msg->buf_pa,
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(void *)__pa((u64)skb->data &
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~(L1_CACHE_BYTES - 1)),
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msg->size, bret);
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xpc_received(partid, channel, (void *) msg);
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priv->stats.rx_errors++;
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return;
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}
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}
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dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
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"skb->end=0x%p skb->len=%d\n", (void *) skb->head,
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(void *) skb->data, (void *) skb->tail, (void *) skb->end,
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skb->len);
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skb->dev = xpnet_device;
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skb->protocol = eth_type_trans(skb, xpnet_device);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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dev_dbg(xpnet, "passing skb to network layer; \n\tskb->head=0x%p "
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"skb->data=0x%p skb->tail=0x%p skb->end=0x%p skb->len=%d\n",
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(void *) skb->head, (void *) skb->data, (void *) skb->tail,
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(void *) skb->end, skb->len);
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xpnet_device->last_rx = jiffies;
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priv->stats.rx_packets++;
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priv->stats.rx_bytes += skb->len + ETH_HLEN;
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netif_rx_ni(skb);
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xpc_received(partid, channel, (void *) msg);
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}
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/*
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* This is the handler which XPC calls during any sort of change in
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* state or message reception on a connection.
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*/
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static void
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xpnet_connection_activity(enum xpc_retval reason, partid_t partid, int channel,
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void *data, void *key)
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{
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long bp;
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DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);
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DBUG_ON(channel != XPC_NET_CHANNEL);
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switch(reason) {
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case xpcMsgReceived: /* message received */
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DBUG_ON(data == NULL);
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xpnet_receive(partid, channel, (struct xpnet_message *) data);
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break;
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case xpcConnected: /* connection completed to a partition */
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spin_lock_bh(&xpnet_broadcast_lock);
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xpnet_broadcast_partitions |= 1UL << (partid -1 );
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bp = xpnet_broadcast_partitions;
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spin_unlock_bh(&xpnet_broadcast_lock);
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netif_carrier_on(xpnet_device);
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dev_dbg(xpnet, "%s connection created to partition %d; "
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"xpnet_broadcast_partitions=0x%lx\n",
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xpnet_device->name, partid, bp);
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break;
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default:
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spin_lock_bh(&xpnet_broadcast_lock);
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xpnet_broadcast_partitions &= ~(1UL << (partid -1 ));
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bp = xpnet_broadcast_partitions;
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spin_unlock_bh(&xpnet_broadcast_lock);
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if (bp == 0) {
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netif_carrier_off(xpnet_device);
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}
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dev_dbg(xpnet, "%s disconnected from partition %d; "
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"xpnet_broadcast_partitions=0x%lx\n",
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xpnet_device->name, partid, bp);
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break;
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}
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}
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static int
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xpnet_dev_open(struct net_device *dev)
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{
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enum xpc_retval ret;
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dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %d, "
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"%d)\n", XPC_NET_CHANNEL, xpnet_connection_activity,
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XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, XPNET_MAX_KTHREADS,
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XPNET_MAX_IDLE_KTHREADS);
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ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL,
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XPNET_MSG_SIZE, XPNET_MSG_NENTRIES,
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XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS);
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if (ret != xpcSuccess) {
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dev_err(xpnet, "ifconfig up of %s failed on XPC connect, "
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"ret=%d\n", dev->name, ret);
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return -ENOMEM;
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}
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dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name);
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return 0;
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}
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static int
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xpnet_dev_stop(struct net_device *dev)
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{
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xpc_disconnect(XPC_NET_CHANNEL);
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dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name);
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return 0;
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}
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static int
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xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
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{
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/* 68 comes from min TCP+IP+MAC header */
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if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
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dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
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"between 68 and %ld\n", dev->name, new_mtu,
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XPNET_MAX_MTU);
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return -EINVAL;
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}
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dev->mtu = new_mtu;
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dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
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return 0;
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}
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/*
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* Required for the net_device structure.
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*/
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static int
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xpnet_dev_set_config(struct net_device *dev, struct ifmap *new_map)
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{
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return 0;
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}
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/*
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* Return statistics to the caller.
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*/
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static struct net_device_stats *
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xpnet_dev_get_stats(struct net_device *dev)
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{
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struct xpnet_dev_private *priv;
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priv = (struct xpnet_dev_private *) dev->priv;
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return &priv->stats;
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}
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/*
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* Notification that the other end has received the message and
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* DMA'd the skb information. At this point, they are done with
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* our side. When all recipients are done processing, we
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* release the skb and then release our pending message structure.
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*/
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static void
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xpnet_send_completed(enum xpc_retval reason, partid_t partid, int channel,
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void *__qm)
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{
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struct xpnet_pending_msg *queued_msg =
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(struct xpnet_pending_msg *) __qm;
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DBUG_ON(queued_msg == NULL);
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dev_dbg(xpnet, "message to %d notified with reason %d\n",
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partid, reason);
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if (atomic_dec_return(&queued_msg->use_count) == 0) {
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dev_dbg(xpnet, "all acks for skb->head=-x%p\n",
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(void *) queued_msg->skb->head);
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dev_kfree_skb_any(queued_msg->skb);
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kfree(queued_msg);
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}
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}
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/*
|
||||
* Network layer has formatted a packet (skb) and is ready to place it
|
||||
* "on the wire". Prepare and send an xpnet_message to all partitions
|
||||
* which have connected with us and are targets of this packet.
|
||||
*
|
||||
* MAC-NOTE: For the XPNET driver, the MAC address contains the
|
||||
* destination partition_id. If the destination partition id word
|
||||
* is 0xff, this packet is to broadcast to all partitions.
|
||||
*/
|
||||
static int
|
||||
xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
||||
{
|
||||
struct xpnet_pending_msg *queued_msg;
|
||||
enum xpc_retval ret;
|
||||
struct xpnet_message *msg;
|
||||
u64 start_addr, end_addr;
|
||||
long dp;
|
||||
u8 second_mac_octet;
|
||||
partid_t dest_partid;
|
||||
struct xpnet_dev_private *priv;
|
||||
u16 embedded_bytes;
|
||||
|
||||
|
||||
priv = (struct xpnet_dev_private *) dev->priv;
|
||||
|
||||
|
||||
dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
|
||||
"skb->end=0x%p skb->len=%d\n", (void *) skb->head,
|
||||
(void *) skb->data, (void *) skb->tail, (void *) skb->end,
|
||||
skb->len);
|
||||
|
||||
|
||||
/*
|
||||
* The xpnet_pending_msg tracks how many outstanding
|
||||
* xpc_send_notifies are relying on this skb. When none
|
||||
* remain, release the skb.
|
||||
*/
|
||||
queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC);
|
||||
if (queued_msg == NULL) {
|
||||
dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping "
|
||||
"packet\n", sizeof(struct xpnet_pending_msg));
|
||||
|
||||
priv->stats.tx_errors++;
|
||||
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
|
||||
/* get the beginning of the first cacheline and end of last */
|
||||
start_addr = ((u64) skb->data & ~(L1_CACHE_BYTES - 1));
|
||||
end_addr = L1_CACHE_ALIGN((u64) skb->tail);
|
||||
|
||||
/* calculate how many bytes to embed in the XPC message */
|
||||
embedded_bytes = 0;
|
||||
if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {
|
||||
/* skb->data does fit so embed */
|
||||
embedded_bytes = skb->len;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Since the send occurs asynchronously, we set the count to one
|
||||
* and begin sending. Any sends that happen to complete before
|
||||
* we are done sending will not free the skb. We will be left
|
||||
* with that task during exit. This also handles the case of
|
||||
* a packet destined for a partition which is no longer up.
|
||||
*/
|
||||
atomic_set(&queued_msg->use_count, 1);
|
||||
queued_msg->skb = skb;
|
||||
|
||||
|
||||
second_mac_octet = skb->data[XPNET_PARTID_OCTET];
|
||||
if (second_mac_octet == 0xff) {
|
||||
/* we are being asked to broadcast to all partitions */
|
||||
dp = xpnet_broadcast_partitions;
|
||||
} else if (second_mac_octet != 0) {
|
||||
dp = xpnet_broadcast_partitions &
|
||||
(1UL << (second_mac_octet - 1));
|
||||
} else {
|
||||
/* 0 is an invalid partid. Ignore */
|
||||
dp = 0;
|
||||
}
|
||||
dev_dbg(xpnet, "destination Partitions mask (dp) = 0x%lx\n", dp);
|
||||
|
||||
/*
|
||||
* If we wanted to allow promiscous mode to work like an
|
||||
* unswitched network, this would be a good point to OR in a
|
||||
* mask of partitions which should be receiving all packets.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Main send loop.
|
||||
*/
|
||||
for (dest_partid = 1; dp && dest_partid < XP_MAX_PARTITIONS;
|
||||
dest_partid++) {
|
||||
|
||||
|
||||
if (!(dp & (1UL << (dest_partid - 1)))) {
|
||||
/* not destined for this partition */
|
||||
continue;
|
||||
}
|
||||
|
||||
/* remove this partition from the destinations mask */
|
||||
dp &= ~(1UL << (dest_partid - 1));
|
||||
|
||||
|
||||
/* found a partition to send to */
|
||||
|
||||
ret = xpc_allocate(dest_partid, XPC_NET_CHANNEL,
|
||||
XPC_NOWAIT, (void **)&msg);
|
||||
if (unlikely(ret != xpcSuccess)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
msg->embedded_bytes = embedded_bytes;
|
||||
if (unlikely(embedded_bytes != 0)) {
|
||||
msg->version = XPNET_VERSION_EMBED;
|
||||
dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n",
|
||||
&msg->data, skb->data, (size_t) embedded_bytes);
|
||||
memcpy(&msg->data, skb->data, (size_t) embedded_bytes);
|
||||
} else {
|
||||
msg->version = XPNET_VERSION;
|
||||
}
|
||||
msg->magic = XPNET_MAGIC;
|
||||
msg->size = end_addr - start_addr;
|
||||
msg->leadin_ignore = (u64) skb->data - start_addr;
|
||||
msg->tailout_ignore = end_addr - (u64) skb->tail;
|
||||
msg->buf_pa = __pa(start_addr);
|
||||
|
||||
dev_dbg(xpnet, "sending XPC message to %d:%d\nmsg->buf_pa="
|
||||
"0x%lx, msg->size=%u, msg->leadin_ignore=%u, "
|
||||
"msg->tailout_ignore=%u\n", dest_partid,
|
||||
XPC_NET_CHANNEL, msg->buf_pa, msg->size,
|
||||
msg->leadin_ignore, msg->tailout_ignore);
|
||||
|
||||
|
||||
atomic_inc(&queued_msg->use_count);
|
||||
|
||||
ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, msg,
|
||||
xpnet_send_completed, queued_msg);
|
||||
if (unlikely(ret != xpcSuccess)) {
|
||||
atomic_dec(&queued_msg->use_count);
|
||||
continue;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
if (atomic_dec_return(&queued_msg->use_count) == 0) {
|
||||
dev_dbg(xpnet, "no partitions to receive packet destined for "
|
||||
"%d\n", dest_partid);
|
||||
|
||||
|
||||
dev_kfree_skb(skb);
|
||||
kfree(queued_msg);
|
||||
}
|
||||
|
||||
priv->stats.tx_packets++;
|
||||
priv->stats.tx_bytes += skb->len;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Deal with transmit timeouts coming from the network layer.
|
||||
*/
|
||||
static void
|
||||
xpnet_dev_tx_timeout (struct net_device *dev)
|
||||
{
|
||||
struct xpnet_dev_private *priv;
|
||||
|
||||
|
||||
priv = (struct xpnet_dev_private *) dev->priv;
|
||||
|
||||
priv->stats.tx_errors++;
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
static int __init
|
||||
xpnet_init(void)
|
||||
{
|
||||
int i;
|
||||
u32 license_num;
|
||||
int result = -ENOMEM;
|
||||
|
||||
|
||||
dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
|
||||
|
||||
/*
|
||||
* use ether_setup() to init the majority of our device
|
||||
* structure and then override the necessary pieces.
|
||||
*/
|
||||
xpnet_device = alloc_netdev(sizeof(struct xpnet_dev_private),
|
||||
XPNET_DEVICE_NAME, ether_setup);
|
||||
if (xpnet_device == NULL) {
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
netif_carrier_off(xpnet_device);
|
||||
|
||||
xpnet_device->mtu = XPNET_DEF_MTU;
|
||||
xpnet_device->change_mtu = xpnet_dev_change_mtu;
|
||||
xpnet_device->open = xpnet_dev_open;
|
||||
xpnet_device->get_stats = xpnet_dev_get_stats;
|
||||
xpnet_device->stop = xpnet_dev_stop;
|
||||
xpnet_device->hard_start_xmit = xpnet_dev_hard_start_xmit;
|
||||
xpnet_device->tx_timeout = xpnet_dev_tx_timeout;
|
||||
xpnet_device->set_config = xpnet_dev_set_config;
|
||||
|
||||
/*
|
||||
* Multicast assumes the LSB of the first octet is set for multicast
|
||||
* MAC addresses. We chose the first octet of the MAC to be unlikely
|
||||
* to collide with any vendor's officially issued MAC.
|
||||
*/
|
||||
xpnet_device->dev_addr[0] = 0xfe;
|
||||
xpnet_device->dev_addr[XPNET_PARTID_OCTET] = sn_partition_id;
|
||||
license_num = sn_partition_serial_number_val();
|
||||
for (i = 3; i >= 0; i--) {
|
||||
xpnet_device->dev_addr[XPNET_LICENSE_OCTET + i] =
|
||||
license_num & 0xff;
|
||||
license_num = license_num >> 8;
|
||||
}
|
||||
|
||||
/*
|
||||
* ether_setup() sets this to a multicast device. We are
|
||||
* really not supporting multicast at this time.
|
||||
*/
|
||||
xpnet_device->flags &= ~IFF_MULTICAST;
|
||||
|
||||
/*
|
||||
* No need to checksum as it is a DMA transfer. The BTE will
|
||||
* report an error if the data is not retrievable and the
|
||||
* packet will be dropped.
|
||||
*/
|
||||
xpnet_device->features = NETIF_F_NO_CSUM;
|
||||
|
||||
result = register_netdev(xpnet_device);
|
||||
if (result != 0) {
|
||||
free_netdev(xpnet_device);
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
module_init(xpnet_init);
|
||||
|
||||
|
||||
static void __exit
|
||||
xpnet_exit(void)
|
||||
{
|
||||
dev_info(xpnet, "unregistering network device %s\n",
|
||||
xpnet_device[0].name);
|
||||
|
||||
unregister_netdev(xpnet_device);
|
||||
|
||||
free_netdev(xpnet_device);
|
||||
}
|
||||
module_exit(xpnet_exit);
|
||||
|
||||
|
||||
MODULE_AUTHOR("Silicon Graphics, Inc.");
|
||||
MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
Loading…
Reference in a new issue