kernel-fxtec-pro1x/drivers/infiniband/hw/amso1100/c2.c

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/*
* Copyright (c) 2005 Ammasso, Inc. All rights reserved.
* Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/inetdevice.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>
#include <rdma/ib_smi.h>
#include "c2.h"
#include "c2_provider.h"
MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
MODULE_DESCRIPTION("Ammasso AMSO1100 Low-level iWARP Driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(DRV_VERSION);
static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK
| NETIF_MSG_IFUP | NETIF_MSG_IFDOWN;
static int debug = -1; /* defaults above */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
static int c2_up(struct net_device *netdev);
static int c2_down(struct net_device *netdev);
static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static void c2_tx_interrupt(struct net_device *netdev);
static void c2_rx_interrupt(struct net_device *netdev);
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
static irqreturn_t c2_interrupt(int irq, void *dev_id);
static void c2_tx_timeout(struct net_device *netdev);
static int c2_change_mtu(struct net_device *netdev, int new_mtu);
static void c2_reset(struct c2_port *c2_port);
static struct net_device_stats *c2_get_stats(struct net_device *netdev);
static struct pci_device_id c2_pci_table[] = {
{ PCI_DEVICE(0x18b8, 0xb001) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, c2_pci_table);
static void c2_print_macaddr(struct net_device *netdev)
{
pr_debug("%s: MAC %02X:%02X:%02X:%02X:%02X:%02X, "
"IRQ %u\n", netdev->name,
netdev->dev_addr[0], netdev->dev_addr[1], netdev->dev_addr[2],
netdev->dev_addr[3], netdev->dev_addr[4], netdev->dev_addr[5],
netdev->irq);
}
static void c2_set_rxbufsize(struct c2_port *c2_port)
{
struct net_device *netdev = c2_port->netdev;
if (netdev->mtu > RX_BUF_SIZE)
c2_port->rx_buf_size =
netdev->mtu + ETH_HLEN + sizeof(struct c2_rxp_hdr) +
NET_IP_ALIGN;
else
c2_port->rx_buf_size = sizeof(struct c2_rxp_hdr) + RX_BUF_SIZE;
}
/*
* Allocate TX ring elements and chain them together.
* One-to-one association of adapter descriptors with ring elements.
*/
static int c2_tx_ring_alloc(struct c2_ring *tx_ring, void *vaddr,
dma_addr_t base, void __iomem * mmio_txp_ring)
{
struct c2_tx_desc *tx_desc;
struct c2_txp_desc __iomem *txp_desc;
struct c2_element *elem;
int i;
tx_ring->start = kmalloc(sizeof(*elem) * tx_ring->count, GFP_KERNEL);
if (!tx_ring->start)
return -ENOMEM;
elem = tx_ring->start;
tx_desc = vaddr;
txp_desc = mmio_txp_ring;
for (i = 0; i < tx_ring->count; i++, elem++, tx_desc++, txp_desc++) {
tx_desc->len = 0;
tx_desc->status = 0;
/* Set TXP_HTXD_UNINIT */
__raw_writeq(cpu_to_be64(0x1122334455667788ULL),
(void __iomem *) txp_desc + C2_TXP_ADDR);
__raw_writew(0, (void __iomem *) txp_desc + C2_TXP_LEN);
__raw_writew(cpu_to_be16(TXP_HTXD_UNINIT),
(void __iomem *) txp_desc + C2_TXP_FLAGS);
elem->skb = NULL;
elem->ht_desc = tx_desc;
elem->hw_desc = txp_desc;
if (i == tx_ring->count - 1) {
elem->next = tx_ring->start;
tx_desc->next_offset = base;
} else {
elem->next = elem + 1;
tx_desc->next_offset =
base + (i + 1) * sizeof(*tx_desc);
}
}
tx_ring->to_use = tx_ring->to_clean = tx_ring->start;
return 0;
}
/*
* Allocate RX ring elements and chain them together.
* One-to-one association of adapter descriptors with ring elements.
*/
static int c2_rx_ring_alloc(struct c2_ring *rx_ring, void *vaddr,
dma_addr_t base, void __iomem * mmio_rxp_ring)
{
struct c2_rx_desc *rx_desc;
struct c2_rxp_desc __iomem *rxp_desc;
struct c2_element *elem;
int i;
rx_ring->start = kmalloc(sizeof(*elem) * rx_ring->count, GFP_KERNEL);
if (!rx_ring->start)
return -ENOMEM;
elem = rx_ring->start;
rx_desc = vaddr;
rxp_desc = mmio_rxp_ring;
for (i = 0; i < rx_ring->count; i++, elem++, rx_desc++, rxp_desc++) {
rx_desc->len = 0;
rx_desc->status = 0;
/* Set RXP_HRXD_UNINIT */
__raw_writew(cpu_to_be16(RXP_HRXD_OK),
(void __iomem *) rxp_desc + C2_RXP_STATUS);
__raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_COUNT);
__raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_LEN);
__raw_writeq(cpu_to_be64(0x99aabbccddeeffULL),
(void __iomem *) rxp_desc + C2_RXP_ADDR);
__raw_writew(cpu_to_be16(RXP_HRXD_UNINIT),
(void __iomem *) rxp_desc + C2_RXP_FLAGS);
elem->skb = NULL;
elem->ht_desc = rx_desc;
elem->hw_desc = rxp_desc;
if (i == rx_ring->count - 1) {
elem->next = rx_ring->start;
rx_desc->next_offset = base;
} else {
elem->next = elem + 1;
rx_desc->next_offset =
base + (i + 1) * sizeof(*rx_desc);
}
}
rx_ring->to_use = rx_ring->to_clean = rx_ring->start;
return 0;
}
/* Setup buffer for receiving */
static inline int c2_rx_alloc(struct c2_port *c2_port, struct c2_element *elem)
{
struct c2_dev *c2dev = c2_port->c2dev;
struct c2_rx_desc *rx_desc = elem->ht_desc;
struct sk_buff *skb;
dma_addr_t mapaddr;
u32 maplen;
struct c2_rxp_hdr *rxp_hdr;
skb = dev_alloc_skb(c2_port->rx_buf_size);
if (unlikely(!skb)) {
pr_debug("%s: out of memory for receive\n",
c2_port->netdev->name);
return -ENOMEM;
}
/* Zero out the rxp hdr in the sk_buff */
memset(skb->data, 0, sizeof(*rxp_hdr));
skb->dev = c2_port->netdev;
maplen = c2_port->rx_buf_size;
mapaddr =
pci_map_single(c2dev->pcidev, skb->data, maplen,
PCI_DMA_FROMDEVICE);
/* Set the sk_buff RXP_header to RXP_HRXD_READY */
rxp_hdr = (struct c2_rxp_hdr *) skb->data;
rxp_hdr->flags = RXP_HRXD_READY;
__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
__raw_writew(cpu_to_be16((u16) maplen - sizeof(*rxp_hdr)),
elem->hw_desc + C2_RXP_LEN);
__raw_writeq(cpu_to_be64(mapaddr), elem->hw_desc + C2_RXP_ADDR);
__raw_writew(cpu_to_be16(RXP_HRXD_READY), elem->hw_desc + C2_RXP_FLAGS);
elem->skb = skb;
elem->mapaddr = mapaddr;
elem->maplen = maplen;
rx_desc->len = maplen;
return 0;
}
/*
* Allocate buffers for the Rx ring
* For receive: rx_ring.to_clean is next received frame
*/
static int c2_rx_fill(struct c2_port *c2_port)
{
struct c2_ring *rx_ring = &c2_port->rx_ring;
struct c2_element *elem;
int ret = 0;
elem = rx_ring->start;
do {
if (c2_rx_alloc(c2_port, elem)) {
ret = 1;
break;
}
} while ((elem = elem->next) != rx_ring->start);
rx_ring->to_clean = rx_ring->start;
return ret;
}
/* Free all buffers in RX ring, assumes receiver stopped */
static void c2_rx_clean(struct c2_port *c2_port)
{
struct c2_dev *c2dev = c2_port->c2dev;
struct c2_ring *rx_ring = &c2_port->rx_ring;
struct c2_element *elem;
struct c2_rx_desc *rx_desc;
elem = rx_ring->start;
do {
rx_desc = elem->ht_desc;
rx_desc->len = 0;
__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
__raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
__raw_writew(0, elem->hw_desc + C2_RXP_LEN);
__raw_writeq(cpu_to_be64(0x99aabbccddeeffULL),
elem->hw_desc + C2_RXP_ADDR);
__raw_writew(cpu_to_be16(RXP_HRXD_UNINIT),
elem->hw_desc + C2_RXP_FLAGS);
if (elem->skb) {
pci_unmap_single(c2dev->pcidev, elem->mapaddr,
elem->maplen, PCI_DMA_FROMDEVICE);
dev_kfree_skb(elem->skb);
elem->skb = NULL;
}
} while ((elem = elem->next) != rx_ring->start);
}
static inline int c2_tx_free(struct c2_dev *c2dev, struct c2_element *elem)
{
struct c2_tx_desc *tx_desc = elem->ht_desc;
tx_desc->len = 0;
pci_unmap_single(c2dev->pcidev, elem->mapaddr, elem->maplen,
PCI_DMA_TODEVICE);
if (elem->skb) {
dev_kfree_skb_any(elem->skb);
elem->skb = NULL;
}
return 0;
}
/* Free all buffers in TX ring, assumes transmitter stopped */
static void c2_tx_clean(struct c2_port *c2_port)
{
struct c2_ring *tx_ring = &c2_port->tx_ring;
struct c2_element *elem;
struct c2_txp_desc txp_htxd;
int retry;
unsigned long flags;
spin_lock_irqsave(&c2_port->tx_lock, flags);
elem = tx_ring->start;
do {
retry = 0;
do {
txp_htxd.flags =
readw(elem->hw_desc + C2_TXP_FLAGS);
if (txp_htxd.flags == TXP_HTXD_READY) {
retry = 1;
__raw_writew(0,
elem->hw_desc + C2_TXP_LEN);
__raw_writeq(0,
elem->hw_desc + C2_TXP_ADDR);
__raw_writew(cpu_to_be16(TXP_HTXD_DONE),
elem->hw_desc + C2_TXP_FLAGS);
c2_port->netstats.tx_dropped++;
break;
} else {
__raw_writew(0,
elem->hw_desc + C2_TXP_LEN);
__raw_writeq(cpu_to_be64(0x1122334455667788ULL),
elem->hw_desc + C2_TXP_ADDR);
__raw_writew(cpu_to_be16(TXP_HTXD_UNINIT),
elem->hw_desc + C2_TXP_FLAGS);
}
c2_tx_free(c2_port->c2dev, elem);
} while ((elem = elem->next) != tx_ring->start);
} while (retry);
c2_port->tx_avail = c2_port->tx_ring.count - 1;
c2_port->c2dev->cur_tx = tx_ring->to_use - tx_ring->start;
if (c2_port->tx_avail > MAX_SKB_FRAGS + 1)
netif_wake_queue(c2_port->netdev);
spin_unlock_irqrestore(&c2_port->tx_lock, flags);
}
/*
* Process transmit descriptors marked 'DONE' by the firmware,
* freeing up their unneeded sk_buffs.
*/
static void c2_tx_interrupt(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
struct c2_dev *c2dev = c2_port->c2dev;
struct c2_ring *tx_ring = &c2_port->tx_ring;
struct c2_element *elem;
struct c2_txp_desc txp_htxd;
spin_lock(&c2_port->tx_lock);
for (elem = tx_ring->to_clean; elem != tx_ring->to_use;
elem = elem->next) {
txp_htxd.flags =
be16_to_cpu(readw(elem->hw_desc + C2_TXP_FLAGS));
if (txp_htxd.flags != TXP_HTXD_DONE)
break;
if (netif_msg_tx_done(c2_port)) {
/* PCI reads are expensive in fast path */
txp_htxd.len =
be16_to_cpu(readw(elem->hw_desc + C2_TXP_LEN));
pr_debug("%s: tx done slot %3Zu status 0x%x len "
"%5u bytes\n",
netdev->name, elem - tx_ring->start,
txp_htxd.flags, txp_htxd.len);
}
c2_tx_free(c2dev, elem);
++(c2_port->tx_avail);
}
tx_ring->to_clean = elem;
if (netif_queue_stopped(netdev)
&& c2_port->tx_avail > MAX_SKB_FRAGS + 1)
netif_wake_queue(netdev);
spin_unlock(&c2_port->tx_lock);
}
static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem)
{
struct c2_rx_desc *rx_desc = elem->ht_desc;
struct c2_rxp_hdr *rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
if (rxp_hdr->status != RXP_HRXD_OK ||
rxp_hdr->len > (rx_desc->len - sizeof(*rxp_hdr))) {
pr_debug("BAD RXP_HRXD\n");
pr_debug(" rx_desc : %p\n", rx_desc);
pr_debug(" index : %Zu\n",
elem - c2_port->rx_ring.start);
pr_debug(" len : %u\n", rx_desc->len);
pr_debug(" rxp_hdr : %p [PA %p]\n", rxp_hdr,
(void *) __pa((unsigned long) rxp_hdr));
pr_debug(" flags : 0x%x\n", rxp_hdr->flags);
pr_debug(" status: 0x%x\n", rxp_hdr->status);
pr_debug(" len : %u\n", rxp_hdr->len);
pr_debug(" rsvd : 0x%x\n", rxp_hdr->rsvd);
}
/* Setup the skb for reuse since we're dropping this pkt */
elem->skb->tail = elem->skb->data = elem->skb->head;
/* Zero out the rxp hdr in the sk_buff */
memset(elem->skb->data, 0, sizeof(*rxp_hdr));
/* Write the descriptor to the adapter's rx ring */
__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
__raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
__raw_writew(cpu_to_be16((u16) elem->maplen - sizeof(*rxp_hdr)),
elem->hw_desc + C2_RXP_LEN);
__raw_writeq(cpu_to_be64(elem->mapaddr), elem->hw_desc + C2_RXP_ADDR);
__raw_writew(cpu_to_be16(RXP_HRXD_READY), elem->hw_desc + C2_RXP_FLAGS);
pr_debug("packet dropped\n");
c2_port->netstats.rx_dropped++;
}
static void c2_rx_interrupt(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
struct c2_dev *c2dev = c2_port->c2dev;
struct c2_ring *rx_ring = &c2_port->rx_ring;
struct c2_element *elem;
struct c2_rx_desc *rx_desc;
struct c2_rxp_hdr *rxp_hdr;
struct sk_buff *skb;
dma_addr_t mapaddr;
u32 maplen, buflen;
unsigned long flags;
spin_lock_irqsave(&c2dev->lock, flags);
/* Begin where we left off */
rx_ring->to_clean = rx_ring->start + c2dev->cur_rx;
for (elem = rx_ring->to_clean; elem->next != rx_ring->to_clean;
elem = elem->next) {
rx_desc = elem->ht_desc;
mapaddr = elem->mapaddr;
maplen = elem->maplen;
skb = elem->skb;
rxp_hdr = (struct c2_rxp_hdr *) skb->data;
if (rxp_hdr->flags != RXP_HRXD_DONE)
break;
buflen = rxp_hdr->len;
/* Sanity check the RXP header */
if (rxp_hdr->status != RXP_HRXD_OK ||
buflen > (rx_desc->len - sizeof(*rxp_hdr))) {
c2_rx_error(c2_port, elem);
continue;
}
/*
* Allocate and map a new skb for replenishing the host
* RX desc
*/
if (c2_rx_alloc(c2_port, elem)) {
c2_rx_error(c2_port, elem);
continue;
}
/* Unmap the old skb */
pci_unmap_single(c2dev->pcidev, mapaddr, maplen,
PCI_DMA_FROMDEVICE);
prefetch(skb->data);
/*
* Skip past the leading 8 bytes comprising of the
* "struct c2_rxp_hdr", prepended by the adapter
* to the usual Ethernet header ("struct ethhdr"),
* to the start of the raw Ethernet packet.
*
* Fix up the various fields in the sk_buff before
* passing it up to netif_rx(). The transfer size
* (in bytes) specified by the adapter len field of
* the "struct rxp_hdr_t" does NOT include the
* "sizeof(struct c2_rxp_hdr)".
*/
skb->data += sizeof(*rxp_hdr);
skb->tail = skb->data + buflen;
skb->len = buflen;
skb->protocol = eth_type_trans(skb, netdev);
netif_rx(skb);
netdev->last_rx = jiffies;
c2_port->netstats.rx_packets++;
c2_port->netstats.rx_bytes += buflen;
}
/* Save where we left off */
rx_ring->to_clean = elem;
c2dev->cur_rx = elem - rx_ring->start;
C2_SET_CUR_RX(c2dev, c2dev->cur_rx);
spin_unlock_irqrestore(&c2dev->lock, flags);
}
/*
* Handle netisr0 TX & RX interrupts.
*/
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
static irqreturn_t c2_interrupt(int irq, void *dev_id)
{
unsigned int netisr0, dmaisr;
int handled = 0;
struct c2_dev *c2dev = (struct c2_dev *) dev_id;
/* Process CCILNET interrupts */
netisr0 = readl(c2dev->regs + C2_NISR0);
if (netisr0) {
/*
* There is an issue with the firmware that always
* provides the status of RX for both TX & RX
* interrupts. So process both queues here.
*/
c2_rx_interrupt(c2dev->netdev);
c2_tx_interrupt(c2dev->netdev);
/* Clear the interrupt */
writel(netisr0, c2dev->regs + C2_NISR0);
handled++;
}
/* Process RNIC interrupts */
dmaisr = readl(c2dev->regs + C2_DISR);
if (dmaisr) {
writel(dmaisr, c2dev->regs + C2_DISR);
c2_rnic_interrupt(c2dev);
handled++;
}
if (handled) {
return IRQ_HANDLED;
} else {
return IRQ_NONE;
}
}
static int c2_up(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
struct c2_dev *c2dev = c2_port->c2dev;
struct c2_element *elem;
struct c2_rxp_hdr *rxp_hdr;
struct in_device *in_dev;
size_t rx_size, tx_size;
int ret, i;
unsigned int netimr0;
if (netif_msg_ifup(c2_port))
pr_debug("%s: enabling interface\n", netdev->name);
/* Set the Rx buffer size based on MTU */
c2_set_rxbufsize(c2_port);
/* Allocate DMA'able memory for Tx/Rx host descriptor rings */
rx_size = c2_port->rx_ring.count * sizeof(struct c2_rx_desc);
tx_size = c2_port->tx_ring.count * sizeof(struct c2_tx_desc);
c2_port->mem_size = tx_size + rx_size;
c2_port->mem = pci_alloc_consistent(c2dev->pcidev, c2_port->mem_size,
&c2_port->dma);
if (c2_port->mem == NULL) {
pr_debug("Unable to allocate memory for "
"host descriptor rings\n");
return -ENOMEM;
}
memset(c2_port->mem, 0, c2_port->mem_size);
/* Create the Rx host descriptor ring */
if ((ret =
c2_rx_ring_alloc(&c2_port->rx_ring, c2_port->mem, c2_port->dma,
c2dev->mmio_rxp_ring))) {
pr_debug("Unable to create RX ring\n");
goto bail0;
}
/* Allocate Rx buffers for the host descriptor ring */
if (c2_rx_fill(c2_port)) {
pr_debug("Unable to fill RX ring\n");
goto bail1;
}
/* Create the Tx host descriptor ring */
if ((ret = c2_tx_ring_alloc(&c2_port->tx_ring, c2_port->mem + rx_size,
c2_port->dma + rx_size,
c2dev->mmio_txp_ring))) {
pr_debug("Unable to create TX ring\n");
goto bail1;
}
/* Set the TX pointer to where we left off */
c2_port->tx_avail = c2_port->tx_ring.count - 1;
c2_port->tx_ring.to_use = c2_port->tx_ring.to_clean =
c2_port->tx_ring.start + c2dev->cur_tx;
/* missing: Initialize MAC */
BUG_ON(c2_port->tx_ring.to_use != c2_port->tx_ring.to_clean);
/* Reset the adapter, ensures the driver is in sync with the RXP */
c2_reset(c2_port);
/* Reset the READY bit in the sk_buff RXP headers & adapter HRXDQ */
for (i = 0, elem = c2_port->rx_ring.start; i < c2_port->rx_ring.count;
i++, elem++) {
rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
rxp_hdr->flags = 0;
__raw_writew(cpu_to_be16(RXP_HRXD_READY),
elem->hw_desc + C2_RXP_FLAGS);
}
/* Enable network packets */
netif_start_queue(netdev);
/* Enable IRQ */
writel(0, c2dev->regs + C2_IDIS);
netimr0 = readl(c2dev->regs + C2_NIMR0);
netimr0 &= ~(C2_PCI_HTX_INT | C2_PCI_HRX_INT);
writel(netimr0, c2dev->regs + C2_NIMR0);
/* Tell the stack to ignore arp requests for ipaddrs bound to
* other interfaces. This is needed to prevent the host stack
* from responding to arp requests to the ipaddr bound on the
* rdma interface.
*/
in_dev = in_dev_get(netdev);
in_dev->cnf.arp_ignore = 1;
in_dev_put(in_dev);
return 0;
bail1:
c2_rx_clean(c2_port);
kfree(c2_port->rx_ring.start);
bail0:
pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
c2_port->dma);
return ret;
}
static int c2_down(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
struct c2_dev *c2dev = c2_port->c2dev;
if (netif_msg_ifdown(c2_port))
pr_debug("%s: disabling interface\n",
netdev->name);
/* Wait for all the queued packets to get sent */
c2_tx_interrupt(netdev);
/* Disable network packets */
netif_stop_queue(netdev);
/* Disable IRQs by clearing the interrupt mask */
writel(1, c2dev->regs + C2_IDIS);
writel(0, c2dev->regs + C2_NIMR0);
/* missing: Stop transmitter */
/* missing: Stop receiver */
/* Reset the adapter, ensures the driver is in sync with the RXP */
c2_reset(c2_port);
/* missing: Turn off LEDs here */
/* Free all buffers in the host descriptor rings */
c2_tx_clean(c2_port);
c2_rx_clean(c2_port);
/* Free the host descriptor rings */
kfree(c2_port->rx_ring.start);
kfree(c2_port->tx_ring.start);
pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
c2_port->dma);
return 0;
}
static void c2_reset(struct c2_port *c2_port)
{
struct c2_dev *c2dev = c2_port->c2dev;
unsigned int cur_rx = c2dev->cur_rx;
/* Tell the hardware to quiesce */
C2_SET_CUR_RX(c2dev, cur_rx | C2_PCI_HRX_QUI);
/*
* The hardware will reset the C2_PCI_HRX_QUI bit once
* the RXP is quiesced. Wait 2 seconds for this.
*/
ssleep(2);
cur_rx = C2_GET_CUR_RX(c2dev);
if (cur_rx & C2_PCI_HRX_QUI)
pr_debug("c2_reset: failed to quiesce the hardware!\n");
cur_rx &= ~C2_PCI_HRX_QUI;
c2dev->cur_rx = cur_rx;
pr_debug("Current RX: %u\n", c2dev->cur_rx);
}
static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
struct c2_dev *c2dev = c2_port->c2dev;
struct c2_ring *tx_ring = &c2_port->tx_ring;
struct c2_element *elem;
dma_addr_t mapaddr;
u32 maplen;
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&c2_port->tx_lock, flags);
if (unlikely(c2_port->tx_avail < (skb_shinfo(skb)->nr_frags + 1))) {
netif_stop_queue(netdev);
spin_unlock_irqrestore(&c2_port->tx_lock, flags);
pr_debug("%s: Tx ring full when queue awake!\n",
netdev->name);
return NETDEV_TX_BUSY;
}
maplen = skb_headlen(skb);
mapaddr =
pci_map_single(c2dev->pcidev, skb->data, maplen, PCI_DMA_TODEVICE);
elem = tx_ring->to_use;
elem->skb = skb;
elem->mapaddr = mapaddr;
elem->maplen = maplen;
/* Tell HW to xmit */
__raw_writeq(cpu_to_be64(mapaddr), elem->hw_desc + C2_TXP_ADDR);
__raw_writew(cpu_to_be16(maplen), elem->hw_desc + C2_TXP_LEN);
__raw_writew(cpu_to_be16(TXP_HTXD_READY), elem->hw_desc + C2_TXP_FLAGS);
c2_port->netstats.tx_packets++;
c2_port->netstats.tx_bytes += maplen;
/* Loop thru additional data fragments and queue them */
if (skb_shinfo(skb)->nr_frags) {
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
maplen = frag->size;
mapaddr =
pci_map_page(c2dev->pcidev, frag->page,
frag->page_offset, maplen,
PCI_DMA_TODEVICE);
elem = elem->next;
elem->skb = NULL;
elem->mapaddr = mapaddr;
elem->maplen = maplen;
/* Tell HW to xmit */
__raw_writeq(cpu_to_be64(mapaddr),
elem->hw_desc + C2_TXP_ADDR);
__raw_writew(cpu_to_be16(maplen),
elem->hw_desc + C2_TXP_LEN);
__raw_writew(cpu_to_be16(TXP_HTXD_READY),
elem->hw_desc + C2_TXP_FLAGS);
c2_port->netstats.tx_packets++;
c2_port->netstats.tx_bytes += maplen;
}
}
tx_ring->to_use = elem->next;
c2_port->tx_avail -= (skb_shinfo(skb)->nr_frags + 1);
if (c2_port->tx_avail <= MAX_SKB_FRAGS + 1) {
netif_stop_queue(netdev);
if (netif_msg_tx_queued(c2_port))
pr_debug("%s: transmit queue full\n",
netdev->name);
}
spin_unlock_irqrestore(&c2_port->tx_lock, flags);
netdev->trans_start = jiffies;
return NETDEV_TX_OK;
}
static struct net_device_stats *c2_get_stats(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
return &c2_port->netstats;
}
static void c2_tx_timeout(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
if (netif_msg_timer(c2_port))
pr_debug("%s: tx timeout\n", netdev->name);
c2_tx_clean(c2_port);
}
static int c2_change_mtu(struct net_device *netdev, int new_mtu)
{
int ret = 0;
if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
return -EINVAL;
netdev->mtu = new_mtu;
if (netif_running(netdev)) {
c2_down(netdev);
c2_up(netdev);
}
return ret;
}
/* Initialize network device */
static struct net_device *c2_devinit(struct c2_dev *c2dev,
void __iomem * mmio_addr)
{
struct c2_port *c2_port = NULL;
struct net_device *netdev = alloc_etherdev(sizeof(*c2_port));
if (!netdev) {
pr_debug("c2_port etherdev alloc failed");
return NULL;
}
SET_MODULE_OWNER(netdev);
SET_NETDEV_DEV(netdev, &c2dev->pcidev->dev);
netdev->open = c2_up;
netdev->stop = c2_down;
netdev->hard_start_xmit = c2_xmit_frame;
netdev->get_stats = c2_get_stats;
netdev->tx_timeout = c2_tx_timeout;
netdev->change_mtu = c2_change_mtu;
netdev->watchdog_timeo = C2_TX_TIMEOUT;
netdev->irq = c2dev->pcidev->irq;
c2_port = netdev_priv(netdev);
c2_port->netdev = netdev;
c2_port->c2dev = c2dev;
c2_port->msg_enable = netif_msg_init(debug, default_msg);
c2_port->tx_ring.count = C2_NUM_TX_DESC;
c2_port->rx_ring.count = C2_NUM_RX_DESC;
spin_lock_init(&c2_port->tx_lock);
/* Copy our 48-bit ethernet hardware address */
memcpy_fromio(netdev->dev_addr, mmio_addr + C2_REGS_ENADDR, 6);
/* Validate the MAC address */
if (!is_valid_ether_addr(netdev->dev_addr)) {
pr_debug("Invalid MAC Address\n");
c2_print_macaddr(netdev);
free_netdev(netdev);
return NULL;
}
c2dev->netdev = netdev;
return netdev;
}
static int __devinit c2_probe(struct pci_dev *pcidev,
const struct pci_device_id *ent)
{
int ret = 0, i;
unsigned long reg0_start, reg0_flags, reg0_len;
unsigned long reg2_start, reg2_flags, reg2_len;
unsigned long reg4_start, reg4_flags, reg4_len;
unsigned kva_map_size;
struct net_device *netdev = NULL;
struct c2_dev *c2dev = NULL;
void __iomem *mmio_regs = NULL;
printk(KERN_INFO PFX "AMSO1100 Gigabit Ethernet driver v%s loaded\n",
DRV_VERSION);
/* Enable PCI device */
ret = pci_enable_device(pcidev);
if (ret) {
printk(KERN_ERR PFX "%s: Unable to enable PCI device\n",
pci_name(pcidev));
goto bail0;
}
reg0_start = pci_resource_start(pcidev, BAR_0);
reg0_len = pci_resource_len(pcidev, BAR_0);
reg0_flags = pci_resource_flags(pcidev, BAR_0);
reg2_start = pci_resource_start(pcidev, BAR_2);
reg2_len = pci_resource_len(pcidev, BAR_2);
reg2_flags = pci_resource_flags(pcidev, BAR_2);
reg4_start = pci_resource_start(pcidev, BAR_4);
reg4_len = pci_resource_len(pcidev, BAR_4);
reg4_flags = pci_resource_flags(pcidev, BAR_4);
pr_debug("BAR0 size = 0x%lX bytes\n", reg0_len);
pr_debug("BAR2 size = 0x%lX bytes\n", reg2_len);
pr_debug("BAR4 size = 0x%lX bytes\n", reg4_len);
/* Make sure PCI base addr are MMIO */
if (!(reg0_flags & IORESOURCE_MEM) ||
!(reg2_flags & IORESOURCE_MEM) || !(reg4_flags & IORESOURCE_MEM)) {
printk(KERN_ERR PFX "PCI regions not an MMIO resource\n");
ret = -ENODEV;
goto bail1;
}
/* Check for weird/broken PCI region reporting */
if ((reg0_len < C2_REG0_SIZE) ||
(reg2_len < C2_REG2_SIZE) || (reg4_len < C2_REG4_SIZE)) {
printk(KERN_ERR PFX "Invalid PCI region sizes\n");
ret = -ENODEV;
goto bail1;
}
/* Reserve PCI I/O and memory resources */
ret = pci_request_regions(pcidev, DRV_NAME);
if (ret) {
printk(KERN_ERR PFX "%s: Unable to request regions\n",
pci_name(pcidev));
goto bail1;
}
if ((sizeof(dma_addr_t) > 4)) {
ret = pci_set_dma_mask(pcidev, DMA_64BIT_MASK);
if (ret < 0) {
printk(KERN_ERR PFX "64b DMA configuration failed\n");
goto bail2;
}
} else {
ret = pci_set_dma_mask(pcidev, DMA_32BIT_MASK);
if (ret < 0) {
printk(KERN_ERR PFX "32b DMA configuration failed\n");
goto bail2;
}
}
/* Enables bus-mastering on the device */
pci_set_master(pcidev);
/* Remap the adapter PCI registers in BAR4 */
mmio_regs = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
sizeof(struct c2_adapter_pci_regs));
if (mmio_regs == 0UL) {
printk(KERN_ERR PFX
"Unable to remap adapter PCI registers in BAR4\n");
ret = -EIO;
goto bail2;
}
/* Validate PCI regs magic */
for (i = 0; i < sizeof(c2_magic); i++) {
if (c2_magic[i] != readb(mmio_regs + C2_REGS_MAGIC + i)) {
printk(KERN_ERR PFX "Downlevel Firmware boot loader "
"[%d/%Zd: got 0x%x, exp 0x%x]. Use the cc_flash "
"utility to update your boot loader\n",
i + 1, sizeof(c2_magic),
readb(mmio_regs + C2_REGS_MAGIC + i),
c2_magic[i]);
printk(KERN_ERR PFX "Adapter not claimed\n");
iounmap(mmio_regs);
ret = -EIO;
goto bail2;
}
}
/* Validate the adapter version */
if (be32_to_cpu(readl(mmio_regs + C2_REGS_VERS)) != C2_VERSION) {
printk(KERN_ERR PFX "Version mismatch "
"[fw=%u, c2=%u], Adapter not claimed\n",
be32_to_cpu(readl(mmio_regs + C2_REGS_VERS)),
C2_VERSION);
ret = -EINVAL;
iounmap(mmio_regs);
goto bail2;
}
/* Validate the adapter IVN */
if (be32_to_cpu(readl(mmio_regs + C2_REGS_IVN)) != C2_IVN) {
printk(KERN_ERR PFX "Downlevel FIrmware level. You should be using "
"the OpenIB device support kit. "
"[fw=0x%x, c2=0x%x], Adapter not claimed\n",
be32_to_cpu(readl(mmio_regs + C2_REGS_IVN)),
C2_IVN);
ret = -EINVAL;
iounmap(mmio_regs);
goto bail2;
}
/* Allocate hardware structure */
c2dev = (struct c2_dev *) ib_alloc_device(sizeof(*c2dev));
if (!c2dev) {
printk(KERN_ERR PFX "%s: Unable to alloc hardware struct\n",
pci_name(pcidev));
ret = -ENOMEM;
iounmap(mmio_regs);
goto bail2;
}
memset(c2dev, 0, sizeof(*c2dev));
spin_lock_init(&c2dev->lock);
c2dev->pcidev = pcidev;
c2dev->cur_tx = 0;
/* Get the last RX index */
c2dev->cur_rx =
(be32_to_cpu(readl(mmio_regs + C2_REGS_HRX_CUR)) -
0xffffc000) / sizeof(struct c2_rxp_desc);
/* Request an interrupt line for the driver */
ret = request_irq(pcidev->irq, c2_interrupt, IRQF_SHARED, DRV_NAME, c2dev);
if (ret) {
printk(KERN_ERR PFX "%s: requested IRQ %u is busy\n",
pci_name(pcidev), pcidev->irq);
iounmap(mmio_regs);
goto bail3;
}
/* Set driver specific data */
pci_set_drvdata(pcidev, c2dev);
/* Initialize network device */
if ((netdev = c2_devinit(c2dev, mmio_regs)) == NULL) {
iounmap(mmio_regs);
goto bail4;
}
/* Save off the actual size prior to unmapping mmio_regs */
kva_map_size = be32_to_cpu(readl(mmio_regs + C2_REGS_PCI_WINSIZE));
/* Unmap the adapter PCI registers in BAR4 */
iounmap(mmio_regs);
/* Register network device */
ret = register_netdev(netdev);
if (ret) {
printk(KERN_ERR PFX "Unable to register netdev, ret = %d\n",
ret);
goto bail5;
}
/* Disable network packets */
netif_stop_queue(netdev);
/* Remap the adapter HRXDQ PA space to kernel VA space */
c2dev->mmio_rxp_ring = ioremap_nocache(reg4_start + C2_RXP_HRXDQ_OFFSET,
C2_RXP_HRXDQ_SIZE);
if (c2dev->mmio_rxp_ring == 0UL) {
printk(KERN_ERR PFX "Unable to remap MMIO HRXDQ region\n");
ret = -EIO;
goto bail6;
}
/* Remap the adapter HTXDQ PA space to kernel VA space */
c2dev->mmio_txp_ring = ioremap_nocache(reg4_start + C2_TXP_HTXDQ_OFFSET,
C2_TXP_HTXDQ_SIZE);
if (c2dev->mmio_txp_ring == 0UL) {
printk(KERN_ERR PFX "Unable to remap MMIO HTXDQ region\n");
ret = -EIO;
goto bail7;
}
/* Save off the current RX index in the last 4 bytes of the TXP Ring */
C2_SET_CUR_RX(c2dev, c2dev->cur_rx);
/* Remap the PCI registers in adapter BAR0 to kernel VA space */
c2dev->regs = ioremap_nocache(reg0_start, reg0_len);
if (c2dev->regs == 0UL) {
printk(KERN_ERR PFX "Unable to remap BAR0\n");
ret = -EIO;
goto bail8;
}
/* Remap the PCI registers in adapter BAR4 to kernel VA space */
c2dev->pa = reg4_start + C2_PCI_REGS_OFFSET;
c2dev->kva = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
kva_map_size);
if (c2dev->kva == 0UL) {
printk(KERN_ERR PFX "Unable to remap BAR4\n");
ret = -EIO;
goto bail9;
}
/* Print out the MAC address */
c2_print_macaddr(netdev);
ret = c2_rnic_init(c2dev);
if (ret) {
printk(KERN_ERR PFX "c2_rnic_init failed: %d\n", ret);
goto bail10;
}
if (c2_register_device(c2dev))
goto bail10;
return 0;
bail10:
iounmap(c2dev->kva);
bail9:
iounmap(c2dev->regs);
bail8:
iounmap(c2dev->mmio_txp_ring);
bail7:
iounmap(c2dev->mmio_rxp_ring);
bail6:
unregister_netdev(netdev);
bail5:
free_netdev(netdev);
bail4:
free_irq(pcidev->irq, c2dev);
bail3:
ib_dealloc_device(&c2dev->ibdev);
bail2:
pci_release_regions(pcidev);
bail1:
pci_disable_device(pcidev);
bail0:
return ret;
}
static void __devexit c2_remove(struct pci_dev *pcidev)
{
struct c2_dev *c2dev = pci_get_drvdata(pcidev);
struct net_device *netdev = c2dev->netdev;
/* Unregister with OpenIB */
c2_unregister_device(c2dev);
/* Clean up the RNIC resources */
c2_rnic_term(c2dev);
/* Remove network device from the kernel */
unregister_netdev(netdev);
/* Free network device */
free_netdev(netdev);
/* Free the interrupt line */
free_irq(pcidev->irq, c2dev);
/* missing: Turn LEDs off here */
/* Unmap adapter PA space */
iounmap(c2dev->kva);
iounmap(c2dev->regs);
iounmap(c2dev->mmio_txp_ring);
iounmap(c2dev->mmio_rxp_ring);
/* Free the hardware structure */
ib_dealloc_device(&c2dev->ibdev);
/* Release reserved PCI I/O and memory resources */
pci_release_regions(pcidev);
/* Disable PCI device */
pci_disable_device(pcidev);
/* Clear driver specific data */
pci_set_drvdata(pcidev, NULL);
}
static struct pci_driver c2_pci_driver = {
.name = DRV_NAME,
.id_table = c2_pci_table,
.probe = c2_probe,
.remove = __devexit_p(c2_remove),
};
static int __init c2_init_module(void)
{
return pci_register_driver(&c2_pci_driver);
}
static void __exit c2_exit_module(void)
{
pci_unregister_driver(&c2_pci_driver);
}
module_init(c2_init_module);
module_exit(c2_exit_module);