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myri10ge.c

/*************************************************************************
 * myri10ge.c: Myricom Myri-10G Ethernet driver.
 *
 * Copyright (C) 2005, 2006 Myricom, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of Myricom, Inc. nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *
 * If the eeprom on your board is not recent enough, you will need to get a
 * newer firmware image at:
 *   http://www.myri.com/scs/download-Myri10GE.html
 *
 * Contact Information:
 *   <help@myri.com>
 *   Myricom, Inc., 325N Santa Anita Avenue, Arcadia, CA 91006
 *************************************************************************/

#include <linux/tcp.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/inet.h>
#include <linux/in.h>
#include <linux/ethtool.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/version.h>
#include <linux/timer.h>
#include <linux/vmalloc.h>
#include <linux/crc32.h>
#include <linux/moduleparam.h>
#include <linux/io.h>
#include <net/checksum.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/processor.h>
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif

#include "myri10ge_mcp.h"
#include "myri10ge_mcp_gen_header.h"

#define MYRI10GE_VERSION_STR "1.0.0"

MODULE_DESCRIPTION("Myricom 10G driver (10GbE)");
MODULE_AUTHOR("Maintainer: help@myri.com");
MODULE_VERSION(MYRI10GE_VERSION_STR);
MODULE_LICENSE("Dual BSD/GPL");

#define MYRI10GE_MAX_ETHER_MTU 9014

#define MYRI10GE_ETH_STOPPED 0
#define MYRI10GE_ETH_STOPPING 1
#define MYRI10GE_ETH_STARTING 2
#define MYRI10GE_ETH_RUNNING 3
#define MYRI10GE_ETH_OPEN_FAILED 4

#define MYRI10GE_EEPROM_STRINGS_SIZE 256
#define MYRI10GE_MAX_SEND_DESC_TSO ((65536 / 2048) * 2)

#define MYRI10GE_NO_CONFIRM_DATA 0xffffffff
#define MYRI10GE_NO_RESPONSE_RESULT 0xffffffff

struct myri10ge_rx_buffer_state {
      struct sk_buff *skb;
       DECLARE_PCI_UNMAP_ADDR(bus)
       DECLARE_PCI_UNMAP_LEN(len)
};

struct myri10ge_tx_buffer_state {
      struct sk_buff *skb;
      int last;
       DECLARE_PCI_UNMAP_ADDR(bus)
       DECLARE_PCI_UNMAP_LEN(len)
};

struct myri10ge_cmd {
      u32 data0;
      u32 data1;
      u32 data2;
};

struct myri10ge_rx_buf {
      struct mcp_kreq_ether_recv __iomem *lanai;      /* lanai ptr for recv ring */
      u8 __iomem *wc_fifo;    /* w/c rx dma addr fifo address */
      struct mcp_kreq_ether_recv *shadow; /* host shadow of recv ring */
      struct myri10ge_rx_buffer_state *info;
      int cnt;
      int alloc_fail;
      int mask;         /* number of rx slots -1 */
};

struct myri10ge_tx_buf {
      struct mcp_kreq_ether_send __iomem *lanai;      /* lanai ptr for sendq */
      u8 __iomem *wc_fifo;    /* w/c send fifo address */
      struct mcp_kreq_ether_send *req_list;     /* host shadow of sendq */
      char *req_bytes;
      struct myri10ge_tx_buffer_state *info;
      int mask;         /* number of transmit slots -1  */
      int boundary;           /* boundary transmits cannot cross */
      int req ____cacheline_aligned;      /* transmit slots submitted     */
      int pkt_start;          /* packets started */
      int done ____cacheline_aligned;     /* transmit slots completed     */
      int pkt_done;           /* packets completed */
};

struct myri10ge_rx_done {
      struct mcp_slot *entry;
      dma_addr_t bus;
      int cnt;
      int idx;
};

struct myri10ge_priv {
      int running;            /* running?             */
      int csum_flag;          /* rx_csums?            */
      struct myri10ge_tx_buf tx;    /* transmit ring        */
      struct myri10ge_rx_buf rx_small;
      struct myri10ge_rx_buf rx_big;
      struct myri10ge_rx_done rx_done;
      int small_bytes;
      struct net_device *dev;
      struct net_device_stats stats;
      u8 __iomem *sram;
      int sram_size;
      unsigned long board_span;
      unsigned long iomem_base;
      u32 __iomem *irq_claim;
      u32 __iomem *irq_deassert;
      char *mac_addr_string;
      struct mcp_cmd_response *cmd;
      dma_addr_t cmd_bus;
      struct mcp_irq_data *fw_stats;
      dma_addr_t fw_stats_bus;
      struct pci_dev *pdev;
      int msi_enabled;
      unsigned int link_state;
      unsigned int rdma_tags_available;
      int intr_coal_delay;
      u32 __iomem *intr_coal_delay_ptr;
      int mtrr;
      int wake_queue;
      int stop_queue;
      int down_cnt;
      wait_queue_head_t down_wq;
      struct work_struct watchdog_work;
      struct timer_list watchdog_timer;
      int watchdog_tx_done;
      int watchdog_tx_req;
      int watchdog_resets;
      int tx_linearized;
      int pause;
      char *fw_name;
      char eeprom_strings[MYRI10GE_EEPROM_STRINGS_SIZE];
      char fw_version[128];
      u8 mac_addr[6];         /* eeprom mac address */
      unsigned long serial_number;
      int vendor_specific_offset;
      u32 devctl;
      u16 msi_flags;
      u32 read_dma;
      u32 write_dma;
      u32 read_write_dma;
};

static char *myri10ge_fw_unaligned = "myri10ge_ethp_z8e.dat";
static char *myri10ge_fw_aligned = "myri10ge_eth_z8e.dat";

static char *myri10ge_fw_name = NULL;
module_param(myri10ge_fw_name, charp, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(myri10ge_fw_name, "Firmware image name\n");

static int myri10ge_ecrc_enable = 1;
module_param(myri10ge_ecrc_enable, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_ecrc_enable, "Enable Extended CRC on PCI-E\n");

static int myri10ge_max_intr_slots = 1024;
module_param(myri10ge_max_intr_slots, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_max_intr_slots, "Interrupt queue slots\n");

static int myri10ge_small_bytes = -1;     /* -1 == auto */
module_param(myri10ge_small_bytes, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(myri10ge_small_bytes, "Threshold of small packets\n");

static int myri10ge_msi = 1;  /* enable msi by default */
module_param(myri10ge_msi, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_msi, "Enable Message Signalled Interrupts\n");

static int myri10ge_intr_coal_delay = 25;
module_param(myri10ge_intr_coal_delay, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_intr_coal_delay, "Interrupt coalescing delay\n");

static int myri10ge_flow_control = 1;
module_param(myri10ge_flow_control, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_flow_control, "Pause parameter\n");

static int myri10ge_deassert_wait = 1;
module_param(myri10ge_deassert_wait, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(myri10ge_deassert_wait,
             "Wait when deasserting legacy interrupts\n");

static int myri10ge_force_firmware = 0;
module_param(myri10ge_force_firmware, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_force_firmware,
             "Force firmware to assume aligned completions\n");

static int myri10ge_skb_cross_4k = 0;
module_param(myri10ge_skb_cross_4k, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(myri10ge_skb_cross_4k,
             "Can a small skb cross a 4KB boundary?\n");

static int myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
module_param(myri10ge_initial_mtu, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_initial_mtu, "Initial MTU\n");

static int myri10ge_napi_weight = 64;
module_param(myri10ge_napi_weight, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_napi_weight, "Set NAPI weight\n");

static int myri10ge_watchdog_timeout = 1;
module_param(myri10ge_watchdog_timeout, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_watchdog_timeout, "Set watchdog timeout\n");

static int myri10ge_max_irq_loops = 1048576;
module_param(myri10ge_max_irq_loops, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_max_irq_loops,
             "Set stuck legacy IRQ detection threshold\n");

#define MYRI10GE_FW_OFFSET 1024*1024
#define MYRI10GE_HIGHPART_TO_U32(X) \
(sizeof (X) == 8) ? ((u32)((u64)(X) >> 32)) : (0)
#define MYRI10GE_LOWPART_TO_U32(X) ((u32)(X))

#define myri10ge_pio_copy(to,from,size) __iowrite64_copy(to,from,size/8)

static int
myri10ge_send_cmd(struct myri10ge_priv *mgp, u32 cmd,
              struct myri10ge_cmd *data, int atomic)
{
      struct mcp_cmd *buf;
      char buf_bytes[sizeof(*buf) + 8];
      struct mcp_cmd_response *response = mgp->cmd;
      char __iomem *cmd_addr = mgp->sram + MXGEFW_CMD_OFFSET;
      u32 dma_low, dma_high, result, value;
      int sleep_total = 0;

      /* ensure buf is aligned to 8 bytes */
      buf = (struct mcp_cmd *)ALIGN((unsigned long)buf_bytes, 8);

      buf->data0 = htonl(data->data0);
      buf->data1 = htonl(data->data1);
      buf->data2 = htonl(data->data2);
      buf->cmd = htonl(cmd);
      dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
      dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);

      buf->response_addr.low = htonl(dma_low);
      buf->response_addr.high = htonl(dma_high);
      response->result = MYRI10GE_NO_RESPONSE_RESULT;
      mb();
      myri10ge_pio_copy(cmd_addr, buf, sizeof(*buf));

      /* wait up to 15ms. Longest command is the DMA benchmark,
       * which is capped at 5ms, but runs from a timeout handler
       * that runs every 7.8ms. So a 15ms timeout leaves us with
       * a 2.2ms margin
       */
      if (atomic) {
            /* if atomic is set, do not sleep,
             * and try to get the completion quickly
             * (1ms will be enough for those commands) */
            for (sleep_total = 0;
                 sleep_total < 1000
                 && response->result == MYRI10GE_NO_RESPONSE_RESULT;
                 sleep_total += 10)
                  udelay(10);
      } else {
            /* use msleep for most command */
            for (sleep_total = 0;
                 sleep_total < 15
                 && response->result == MYRI10GE_NO_RESPONSE_RESULT;
                 sleep_total++)
                  msleep(1);
      }

      result = ntohl(response->result);
      value = ntohl(response->data);
      if (result != MYRI10GE_NO_RESPONSE_RESULT) {
            if (result == 0) {
                  data->data0 = value;
                  return 0;
            } else {
                  dev_err(&mgp->pdev->dev,
                        "command %d failed, result = %d\n",
                        cmd, result);
                  return -ENXIO;
            }
      }

      dev_err(&mgp->pdev->dev, "command %d timed out, result = %d\n",
            cmd, result);
      return -EAGAIN;
}

/*
 * The eeprom strings on the lanaiX have the format
 * SN=x\0
 * MAC=x:x:x:x:x:x\0
 * PT:ddd mmm xx xx:xx:xx xx\0
 * PV:ddd mmm xx xx:xx:xx xx\0
 */
static int myri10ge_read_mac_addr(struct myri10ge_priv *mgp)
{
      char *ptr, *limit;
      int i;

      ptr = mgp->eeprom_strings;
      limit = mgp->eeprom_strings + MYRI10GE_EEPROM_STRINGS_SIZE;

      while (*ptr != '\0' && ptr < limit) {
            if (memcmp(ptr, "MAC=", 4) == 0) {
                  ptr += 4;
                  mgp->mac_addr_string = ptr;
                  for (i = 0; i < 6; i++) {
                        if ((ptr + 2) > limit)
                              goto abort;
                        mgp->mac_addr[i] =
                            simple_strtoul(ptr, &ptr, 16);
                        ptr += 1;
                  }
            }
            if (memcmp((const void *)ptr, "SN=", 3) == 0) {
                  ptr += 3;
                  mgp->serial_number = simple_strtoul(ptr, &ptr, 10);
            }
            while (ptr < limit && *ptr++) ;
      }

      return 0;

abort:
      dev_err(&mgp->pdev->dev, "failed to parse eeprom_strings\n");
      return -ENXIO;
}

/*
 * Enable or disable periodic RDMAs from the host to make certain
 * chipsets resend dropped PCIe messages
 */

static void myri10ge_dummy_rdma(struct myri10ge_priv *mgp, int enable)
{
      char __iomem *submit;
      u32 buf[16];
      u32 dma_low, dma_high;
      int i;

      /* clear confirmation addr */
      mgp->cmd->data = 0;
      mb();

      /* send a rdma command to the PCIe engine, and wait for the
       * response in the confirmation address.  The firmware should
       * write a -1 there to indicate it is alive and well
       */
      dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
      dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);

      buf[0] = htonl(dma_high);     /* confirm addr MSW */
      buf[1] = htonl(dma_low);      /* confirm addr LSW */
      buf[2] = htonl(MYRI10GE_NO_CONFIRM_DATA); /* confirm data */
      buf[3] = htonl(dma_high);     /* dummy addr MSW */
      buf[4] = htonl(dma_low);      /* dummy addr LSW */
      buf[5] = htonl(enable); /* enable? */

      submit = mgp->sram + 0xfc01c0;

      myri10ge_pio_copy(submit, &buf, sizeof(buf));
      for (i = 0; mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA && i < 20; i++)
            msleep(1);
      if (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA)
            dev_err(&mgp->pdev->dev, "dummy rdma %s failed\n",
                  (enable ? "enable" : "disable"));
}

static int
myri10ge_validate_firmware(struct myri10ge_priv *mgp,
                     struct mcp_gen_header *hdr)
{
      struct device *dev = &mgp->pdev->dev;
      int major, minor;

      /* check firmware type */
      if (ntohl(hdr->mcp_type) != MCP_TYPE_ETH) {
            dev_err(dev, "Bad firmware type: 0x%x\n", ntohl(hdr->mcp_type));
            return -EINVAL;
      }

      /* save firmware version for ethtool */
      strncpy(mgp->fw_version, hdr->version, sizeof(mgp->fw_version));

      sscanf(mgp->fw_version, "%d.%d", &major, &minor);

      if (!(major == MXGEFW_VERSION_MAJOR && minor == MXGEFW_VERSION_MINOR)) {
            dev_err(dev, "Found firmware version %s\n", mgp->fw_version);
            dev_err(dev, "Driver needs %d.%d\n", MXGEFW_VERSION_MAJOR,
                  MXGEFW_VERSION_MINOR);
            return -EINVAL;
      }
      return 0;
}

static int myri10ge_load_hotplug_firmware(struct myri10ge_priv *mgp, u32 * size)
{
      unsigned crc, reread_crc;
      const struct firmware *fw;
      struct device *dev = &mgp->pdev->dev;
      struct mcp_gen_header *hdr;
      size_t hdr_offset;
      int status;
      unsigned i;

      if ((status = request_firmware(&fw, mgp->fw_name, dev)) < 0) {
            dev_err(dev, "Unable to load %s firmware image via hotplug\n",
                  mgp->fw_name);
            status = -EINVAL;
            goto abort_with_nothing;
      }

      /* check size */

      if (fw->size >= mgp->sram_size - MYRI10GE_FW_OFFSET ||
          fw->size < MCP_HEADER_PTR_OFFSET + 4) {
            dev_err(dev, "Firmware size invalid:%d\n", (int)fw->size);
            status = -EINVAL;
            goto abort_with_fw;
      }

      /* check id */
      hdr_offset = ntohl(*(u32 *) (fw->data + MCP_HEADER_PTR_OFFSET));
      if ((hdr_offset & 3) || hdr_offset + sizeof(*hdr) > fw->size) {
            dev_err(dev, "Bad firmware file\n");
            status = -EINVAL;
            goto abort_with_fw;
      }
      hdr = (void *)(fw->data + hdr_offset);

      status = myri10ge_validate_firmware(mgp, hdr);
      if (status != 0)
            goto abort_with_fw;

      crc = crc32(~0, fw->data, fw->size);
      for (i = 0; i < fw->size; i += 256) {
            myri10ge_pio_copy(mgp->sram + MYRI10GE_FW_OFFSET + i,
                          fw->data + i,
                          min(256U, (unsigned)(fw->size - i)));
            mb();
            readb(mgp->sram);
      }
      /* corruption checking is good for parity recovery and buggy chipset */
      memcpy_fromio(fw->data, mgp->sram + MYRI10GE_FW_OFFSET, fw->size);
      reread_crc = crc32(~0, fw->data, fw->size);
      if (crc != reread_crc) {
            dev_err(dev, "CRC failed(fw-len=%u), got 0x%x (expect 0x%x)\n",
                  (unsigned)fw->size, reread_crc, crc);
            status = -EIO;
            goto abort_with_fw;
      }
      *size = (u32) fw->size;

abort_with_fw:
      release_firmware(fw);

abort_with_nothing:
      return status;
}

static int myri10ge_adopt_running_firmware(struct myri10ge_priv *mgp)
{
      struct mcp_gen_header *hdr;
      struct device *dev = &mgp->pdev->dev;
      const size_t bytes = sizeof(struct mcp_gen_header);
      size_t hdr_offset;
      int status;

      /* find running firmware header */
      hdr_offset = ntohl(__raw_readl(mgp->sram + MCP_HEADER_PTR_OFFSET));

      if ((hdr_offset & 3) || hdr_offset + sizeof(*hdr) > mgp->sram_size) {
            dev_err(dev, "Running firmware has bad header offset (%d)\n",
                  (int)hdr_offset);
            return -EIO;
      }

      /* copy header of running firmware from SRAM to host memory to
       * validate firmware */
      hdr = kmalloc(bytes, GFP_KERNEL);
      if (hdr == NULL) {
            dev_err(dev, "could not malloc firmware hdr\n");
            return -ENOMEM;
      }
      memcpy_fromio(hdr, mgp->sram + hdr_offset, bytes);
      status = myri10ge_validate_firmware(mgp, hdr);
      kfree(hdr);
      return status;
}

static int myri10ge_load_firmware(struct myri10ge_priv *mgp)
{
      char __iomem *submit;
      u32 buf[16];
      u32 dma_low, dma_high, size;
      int status, i;

      size = 0;
      status = myri10ge_load_hotplug_firmware(mgp, &size);
      if (status) {
            dev_warn(&mgp->pdev->dev, "hotplug firmware loading failed\n");

            /* Do not attempt to adopt firmware if there
             * was a bad crc */
            if (status == -EIO)
                  return status;

            status = myri10ge_adopt_running_firmware(mgp);
            if (status != 0) {
                  dev_err(&mgp->pdev->dev,
                        "failed to adopt running firmware\n");
                  return status;
            }
            dev_info(&mgp->pdev->dev,
                   "Successfully adopted running firmware\n");
            if (mgp->tx.boundary == 4096) {
                  dev_warn(&mgp->pdev->dev,
                         "Using firmware currently running on NIC"
                         ".  For optimal\n");
                  dev_warn(&mgp->pdev->dev,
                         "performance consider loading optimized "
                         "firmware\n");
                  dev_warn(&mgp->pdev->dev, "via hotplug\n");
            }

            mgp->fw_name = "adopted";
            mgp->tx.boundary = 2048;
            return status;
      }

      /* clear confirmation addr */
      mgp->cmd->data = 0;
      mb();

      /* send a reload command to the bootstrap MCP, and wait for the
       *  response in the confirmation address.  The firmware should
       * write a -1 there to indicate it is alive and well
       */
      dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
      dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);

      buf[0] = htonl(dma_high);     /* confirm addr MSW */
      buf[1] = htonl(dma_low);      /* confirm addr LSW */
      buf[2] = htonl(MYRI10GE_NO_CONFIRM_DATA); /* confirm data */

      /* FIX: All newest firmware should un-protect the bottom of
       * the sram before handoff. However, the very first interfaces
       * do not. Therefore the handoff copy must skip the first 8 bytes
       */
      buf[3] = htonl(MYRI10GE_FW_OFFSET + 8);   /* where the code starts */
      buf[4] = htonl(size - 8);     /* length of code */
      buf[5] = htonl(8);      /* where to copy to */
      buf[6] = htonl(0);      /* where to jump to */

      submit = mgp->sram + 0xfc0000;

      myri10ge_pio_copy(submit, &buf, sizeof(buf));
      mb();
      msleep(1);
      mb();
      i = 0;
      while (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA && i < 20) {
            msleep(1);
            i++;
      }
      if (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA) {
            dev_err(&mgp->pdev->dev, "handoff failed\n");
            return -ENXIO;
      }
      dev_info(&mgp->pdev->dev, "handoff confirmed\n");
      myri10ge_dummy_rdma(mgp, 1);

      return 0;
}

static int myri10ge_update_mac_address(struct myri10ge_priv *mgp, u8 * addr)
{
      struct myri10ge_cmd cmd;
      int status;

      cmd.data0 = ((addr[0] << 24) | (addr[1] << 16)
                 | (addr[2] << 8) | addr[3]);

      cmd.data1 = ((addr[4] << 8) | (addr[5]));

      status = myri10ge_send_cmd(mgp, MXGEFW_SET_MAC_ADDRESS, &cmd, 0);
      return status;
}

static int myri10ge_change_pause(struct myri10ge_priv *mgp, int pause)
{
      struct myri10ge_cmd cmd;
      int status, ctl;

      ctl = pause ? MXGEFW_ENABLE_FLOW_CONTROL : MXGEFW_DISABLE_FLOW_CONTROL;
      status = myri10ge_send_cmd(mgp, ctl, &cmd, 0);

      if (status) {
            printk(KERN_ERR
                   "myri10ge: %s: Failed to set flow control mode\n",
                   mgp->dev->name);
            return status;
      }
      mgp->pause = pause;
      return 0;
}

static void
myri10ge_change_promisc(struct myri10ge_priv *mgp, int promisc, int atomic)
{
      struct myri10ge_cmd cmd;
      int status, ctl;

      ctl = promisc ? MXGEFW_ENABLE_PROMISC : MXGEFW_DISABLE_PROMISC;
      status = myri10ge_send_cmd(mgp, ctl, &cmd, atomic);
      if (status)
            printk(KERN_ERR "myri10ge: %s: Failed to set promisc mode\n",
                   mgp->dev->name);
}

static int myri10ge_reset(struct myri10ge_priv *mgp)
{
      struct myri10ge_cmd cmd;
      int status;
      size_t bytes;
      u32 len;

      /* try to send a reset command to the card to see if it
       * is alive */
      memset(&cmd, 0, sizeof(cmd));
      status = myri10ge_send_cmd(mgp, MXGEFW_CMD_RESET, &cmd, 0);
      if (status != 0) {
            dev_err(&mgp->pdev->dev, "failed reset\n");
            return -ENXIO;
      }

      /* Now exchange information about interrupts  */

      bytes = myri10ge_max_intr_slots * sizeof(*mgp->rx_done.entry);
      memset(mgp->rx_done.entry, 0, bytes);
      cmd.data0 = (u32) bytes;
      status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_INTRQ_SIZE, &cmd, 0);
      cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->rx_done.bus);
      cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->rx_done.bus);
      status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_INTRQ_DMA, &cmd, 0);

      status |=
          myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_IRQ_ACK_OFFSET, &cmd, 0);
      mgp->irq_claim = (__iomem u32 *) (mgp->sram + cmd.data0);
      if (!mgp->msi_enabled) {
            status |= myri10ge_send_cmd
                (mgp, MXGEFW_CMD_GET_IRQ_DEASSERT_OFFSET, &cmd, 0);
            mgp->irq_deassert = (__iomem u32 *) (mgp->sram + cmd.data0);

      }
      status |= myri10ge_send_cmd
          (mgp, MXGEFW_CMD_GET_INTR_COAL_DELAY_OFFSET, &cmd, 0);
      mgp->intr_coal_delay_ptr = (__iomem u32 *) (mgp->sram + cmd.data0);
      if (status != 0) {
            dev_err(&mgp->pdev->dev, "failed set interrupt parameters\n");
            return status;
      }
      __raw_writel(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);

      /* Run a small DMA test.
       * The magic multipliers to the length tell the firmware
       * to do DMA read, write, or read+write tests.  The
       * results are returned in cmd.data0.  The upper 16
       * bits or the return is the number of transfers completed.
       * The lower 16 bits is the time in 0.5us ticks that the
       * transfers took to complete.
       */

      len = mgp->tx.boundary;

      cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->rx_done.bus);
      cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->rx_done.bus);
      cmd.data2 = len * 0x10000;
      status = myri10ge_send_cmd(mgp, MXGEFW_DMA_TEST, &cmd, 0);
      if (status == 0)
            mgp->read_dma = ((cmd.data0 >> 16) * len * 2) /
                (cmd.data0 & 0xffff);
      else
            dev_warn(&mgp->pdev->dev, "DMA read benchmark failed: %d\n",
                   status);
      cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->rx_done.bus);
      cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->rx_done.bus);
      cmd.data2 = len * 0x1;
      status = myri10ge_send_cmd(mgp, MXGEFW_DMA_TEST, &cmd, 0);
      if (status == 0)
            mgp->write_dma = ((cmd.data0 >> 16) * len * 2) /
                (cmd.data0 & 0xffff);
      else
            dev_warn(&mgp->pdev->dev, "DMA write benchmark failed: %d\n",
                   status);

      cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->rx_done.bus);
      cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->rx_done.bus);
      cmd.data2 = len * 0x10001;
      status = myri10ge_send_cmd(mgp, MXGEFW_DMA_TEST, &cmd, 0);
      if (status == 0)
            mgp->read_write_dma = ((cmd.data0 >> 16) * len * 2 * 2) /
                (cmd.data0 & 0xffff);
      else
            dev_warn(&mgp->pdev->dev,
                   "DMA read/write benchmark failed: %d\n", status);

      memset(mgp->rx_done.entry, 0, bytes);

      /* reset mcp/driver shared state back to 0 */
      mgp->tx.req = 0;
      mgp->tx.done = 0;
      mgp->tx.pkt_start = 0;
      mgp->tx.pkt_done = 0;
      mgp->rx_big.cnt = 0;
      mgp->rx_small.cnt = 0;
      mgp->rx_done.idx = 0;
      mgp->rx_done.cnt = 0;
      status = myri10ge_update_mac_address(mgp, mgp->dev->dev_addr);
      myri10ge_change_promisc(mgp, 0, 0);
      myri10ge_change_pause(mgp, mgp->pause);
      return status;
}

static inline void
myri10ge_submit_8rx(struct mcp_kreq_ether_recv __iomem * dst,
                struct mcp_kreq_ether_recv *src)
{
      u32 low;

      low = src->addr_low;
      src->addr_low = DMA_32BIT_MASK;
      myri10ge_pio_copy(dst, src, 8 * sizeof(*src));
      mb();
      src->addr_low = low;
      __raw_writel(low, &dst->addr_low);
      mb();
}

/*
 * Set of routines to get a new receive buffer.  Any buffer which
 * crosses a 4KB boundary must start on a 4KB boundary due to PCIe
 * wdma restrictions. We also try to align any smaller allocation to
 * at least a 16 byte boundary for efficiency.  We assume the linux
 * memory allocator works by powers of 2, and will not return memory
 * smaller than 2KB which crosses a 4KB boundary.  If it does, we fall
 * back to allocating 2x as much space as required.
 *
 * We intend to replace large (>4KB) skb allocations by using
 * pages directly and building a fraglist in the near future.
 */

static inline struct sk_buff *myri10ge_alloc_big(int bytes)
{
      struct sk_buff *skb;
      unsigned long data, roundup;

      skb = dev_alloc_skb(bytes + 4096 + MXGEFW_PAD);
      if (skb == NULL)
            return NULL;

      /* Correct skb->truesize so that socket buffer
       * accounting is not confused the rounding we must
       * do to satisfy alignment constraints.
       */
      skb->truesize -= 4096;

      data = (unsigned long)(skb->data);
      roundup = (-data) & (4095);
      skb_reserve(skb, roundup);
      return skb;
}

/* Allocate 2x as much space as required and use whichever portion
 * does not cross a 4KB boundary */
static inline struct sk_buff *myri10ge_alloc_small_safe(unsigned int bytes)
{
      struct sk_buff *skb;
      unsigned long data, boundary;

      skb = dev_alloc_skb(2 * (bytes + MXGEFW_PAD) - 1);
      if (unlikely(skb == NULL))
            return NULL;

      /* Correct skb->truesize so that socket buffer
       * accounting is not confused the rounding we must
       * do to satisfy alignment constraints.
       */
      skb->truesize -= bytes + MXGEFW_PAD;

      data = (unsigned long)(skb->data);
      boundary = (data + 4095UL) & ~4095UL;
      if ((boundary - data) >= (bytes + MXGEFW_PAD))
            return skb;

      skb_reserve(skb, boundary - data);
      return skb;
}

/* Allocate just enough space, and verify that the allocated
 * space does not cross a 4KB boundary */
static inline struct sk_buff *myri10ge_alloc_small(int bytes)
{
      struct sk_buff *skb;
      unsigned long roundup, data, end;

      skb = dev_alloc_skb(bytes + 16 + MXGEFW_PAD);
      if (unlikely(skb == NULL))
            return NULL;

      /* Round allocated buffer to 16 byte boundary */
      data = (unsigned long)(skb->data);
      roundup = (-data) & 15UL;
      skb_reserve(skb, roundup);
      /* Verify that the data buffer does not cross a page boundary */
      data = (unsigned long)(skb->data);
      end = data + bytes + MXGEFW_PAD - 1;
      if (unlikely(((end >> 12) != (data >> 12)) && (data & 4095UL))) {
            printk(KERN_NOTICE
                   "myri10ge_alloc_small: small skb crossed 4KB boundary\n");
            myri10ge_skb_cross_4k = 1;
            dev_kfree_skb_any(skb);
            skb = myri10ge_alloc_small_safe(bytes);
      }
      return skb;
}

static inline int
myri10ge_getbuf(struct myri10ge_rx_buf *rx, struct pci_dev *pdev, int bytes,
            int idx)
{
      struct sk_buff *skb;
      dma_addr_t bus;
      int len, retval = 0;

      bytes += VLAN_HLEN;     /* account for 802.1q vlan tag */

      if ((bytes + MXGEFW_PAD) > (4096 - 16) /* linux overhead */ )
            skb = myri10ge_alloc_big(bytes);
      else if (myri10ge_skb_cross_4k)
            skb = myri10ge_alloc_small_safe(bytes);
      else
            skb = myri10ge_alloc_small(bytes);

      if (unlikely(skb == NULL)) {
            rx->alloc_fail++;
            retval = -ENOBUFS;
            goto done;
      }

      /* set len so that it only covers the area we
       * need mapped for DMA */
      len = bytes + MXGEFW_PAD;

      bus = pci_map_single(pdev, skb->data, len, PCI_DMA_FROMDEVICE);
      rx->info[idx].skb = skb;
      pci_unmap_addr_set(&rx->info[idx], bus, bus);
      pci_unmap_len_set(&rx->info[idx], len, len);
      rx->shadow[idx].addr_low = htonl(MYRI10GE_LOWPART_TO_U32(bus));
      rx->shadow[idx].addr_high = htonl(MYRI10GE_HIGHPART_TO_U32(bus));

done:
      /* copy 8 descriptors (64-bytes) to the mcp at a time */
      if ((idx & 7) == 7) {
            if (rx->wc_fifo == NULL)
                  myri10ge_submit_8rx(&rx->lanai[idx - 7],
                                  &rx->shadow[idx - 7]);
            else {
                  mb();
                  myri10ge_pio_copy(rx->wc_fifo,
                                &rx->shadow[idx - 7], 64);
            }
      }
      return retval;
}

static inline void myri10ge_vlan_ip_csum(struct sk_buff *skb, u16 hw_csum)
{
      struct vlan_hdr *vh = (struct vlan_hdr *)(skb->data);

      if ((skb->protocol == ntohs(ETH_P_8021Q)) &&
          (vh->h_vlan_encapsulated_proto == htons(ETH_P_IP) ||
           vh->h_vlan_encapsulated_proto == htons(ETH_P_IPV6))) {
            skb->csum = hw_csum;
            skb->ip_summed = CHECKSUM_HW;
      }
}

static inline unsigned long
myri10ge_rx_done(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
             int bytes, int len, int csum)
{
      dma_addr_t bus;
      struct sk_buff *skb;
      int idx, unmap_len;

      idx = rx->cnt & rx->mask;
      rx->cnt++;

      /* save a pointer to the received skb */
      skb = rx->info[idx].skb;
      bus = pci_unmap_addr(&rx->info[idx], bus);
      unmap_len = pci_unmap_len(&rx->info[idx], len);

      /* try to replace the received skb */
      if (myri10ge_getbuf(rx, mgp->pdev, bytes, idx)) {
            /* drop the frame -- the old skbuf is re-cycled */
            mgp->stats.rx_dropped += 1;
            return 0;
      }

      /* unmap the recvd skb */
      pci_unmap_single(mgp->pdev, bus, unmap_len, PCI_DMA_FROMDEVICE);

      /* mcp implicitly skips 1st bytes so that packet is properly
       * aligned */
      skb_reserve(skb, MXGEFW_PAD);

      /* set the length of the frame */
      skb_put(skb, len);

      skb->protocol = eth_type_trans(skb, mgp->dev);
      skb->dev = mgp->dev;
      if (mgp->csum_flag) {
            if ((skb->protocol == ntohs(ETH_P_IP)) ||
                (skb->protocol == ntohs(ETH_P_IPV6))) {
                  skb->csum = ntohs((u16) csum);
                  skb->ip_summed = CHECKSUM_HW;
            } else
                  myri10ge_vlan_ip_csum(skb, ntohs((u16) csum));
      }

      netif_receive_skb(skb);
      mgp->dev->last_rx = jiffies;
      return 1;
}

static inline void myri10ge_tx_done(struct myri10ge_priv *mgp, int mcp_index)
{
      struct pci_dev *pdev = mgp->pdev;
      struct myri10ge_tx_buf *tx = &mgp->tx;
      struct sk_buff *skb;
      int idx, len;
      int limit = 0;

      while (tx->pkt_done != mcp_index) {
            idx = tx->done & tx->mask;
            skb = tx->info[idx].skb;

            /* Mark as free */
            tx->info[idx].skb = NULL;
            if (tx->info[idx].last) {
                  tx->pkt_done++;
                  tx->info[idx].last = 0;
            }
            tx->done++;
            len = pci_unmap_len(&tx->info[idx], len);
            pci_unmap_len_set(&tx->info[idx], len, 0);
            if (skb) {
                  mgp->stats.tx_bytes += skb->len;
                  mgp->stats.tx_packets++;
                  dev_kfree_skb_irq(skb);
                  if (len)
                        pci_unmap_single(pdev,
                                     pci_unmap_addr(&tx->info[idx],
                                                bus), len,
                                     PCI_DMA_TODEVICE);
            } else {
                  if (len)
                        pci_unmap_page(pdev,
                                     pci_unmap_addr(&tx->info[idx],
                                                bus), len,
                                     PCI_DMA_TODEVICE);
            }

            /* limit potential for livelock by only handling
             * 2 full tx rings per call */
            if (unlikely(++limit > 2 * tx->mask))
                  break;
      }
      /* start the queue if we've stopped it */
      if (netif_queue_stopped(mgp->dev)
          && tx->req - tx->done < (tx->mask >> 1)) {
            mgp->wake_queue++;
            netif_wake_queue(mgp->dev);
      }
}

static inline void myri10ge_clean_rx_done(struct myri10ge_priv *mgp, int *limit)
{
      struct myri10ge_rx_done *rx_done = &mgp->rx_done;
      unsigned long rx_bytes = 0;
      unsigned long rx_packets = 0;
      unsigned long rx_ok;

      int idx = rx_done->idx;
      int cnt = rx_done->cnt;
      u16 length;
      u16 checksum;

      while (rx_done->entry[idx].length != 0 && *limit != 0) {
            length = ntohs(rx_done->entry[idx].length);
            rx_done->entry[idx].length = 0;
            checksum = ntohs(rx_done->entry[idx].checksum);
            if (length <= mgp->small_bytes)
                  rx_ok = myri10ge_rx_done(mgp, &mgp->rx_small,
                                     mgp->small_bytes,
                                     length, checksum);
            else
                  rx_ok = myri10ge_rx_done(mgp, &mgp->rx_big,
                                     mgp->dev->mtu + ETH_HLEN,
                                     length, checksum);
            rx_packets += rx_ok;
            rx_bytes += rx_ok * (unsigned long)length;
            cnt++;
            idx = cnt & (myri10ge_max_intr_slots - 1);

            /* limit potential for livelock by only handling a
             * limited number of frames. */
            (*limit)--;
      }
      rx_done->idx = idx;
      rx_done->cnt = cnt;
      mgp->stats.rx_packets += rx_packets;
      mgp->stats.rx_bytes += rx_bytes;
}

static inline void myri10ge_check_statblock(struct myri10ge_priv *mgp)
{
      struct mcp_irq_data *stats = mgp->fw_stats;

      if (unlikely(stats->stats_updated)) {
            if (mgp->link_state != stats->link_up) {
                  mgp->link_state = stats->link_up;
                  if (mgp->link_state) {
                        printk(KERN_INFO "myri10ge: %s: link up\n",
                               mgp->dev->name);
                        netif_carrier_on(mgp->dev);
                  } else {
                        printk(KERN_INFO "myri10ge: %s: link down\n",
                               mgp->dev->name);
                        netif_carrier_off(mgp->dev);
                  }
            }
            if (mgp->rdma_tags_available !=
                ntohl(mgp->fw_stats->rdma_tags_available)) {
                  mgp->rdma_tags_available =
                      ntohl(mgp->fw_stats->rdma_tags_available);
                  printk(KERN_WARNING "myri10ge: %s: RDMA timed out! "
                         "%d tags left\n", mgp->dev->name,
                         mgp->rdma_tags_available);
            }
            mgp->down_cnt += stats->link_down;
            if (stats->link_down)
                  wake_up(&mgp->down_wq);
      }
}

static int myri10ge_poll(struct net_device *netdev, int *budget)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);
      struct myri10ge_rx_done *rx_done = &mgp->rx_done;
      int limit, orig_limit, work_done;

      /* process as many rx events as NAPI will allow */
      limit = min(*budget, netdev->quota);
      orig_limit = limit;
      myri10ge_clean_rx_done(mgp, &limit);
      work_done = orig_limit - limit;
      *budget -= work_done;
      netdev->quota -= work_done;

      if (rx_done->entry[rx_done->idx].length == 0 || !netif_running(netdev)) {
            netif_rx_complete(netdev);
            __raw_writel(htonl(3), mgp->irq_claim);
            return 0;
      }
      return 1;
}

static irqreturn_t myri10ge_intr(int irq, void *arg, struct pt_regs *regs)
{
      struct myri10ge_priv *mgp = arg;
      struct mcp_irq_data *stats = mgp->fw_stats;
      struct myri10ge_tx_buf *tx = &mgp->tx;
      u32 send_done_count;
      int i;

      /* make sure it is our IRQ, and that the DMA has finished */
      if (unlikely(!stats->valid))
            return (IRQ_NONE);

      /* low bit indicates receives are present, so schedule
       * napi poll handler */
      if (stats->valid & 1)
            netif_rx_schedule(mgp->dev);

      if (!mgp->msi_enabled) {
            __raw_writel(0, mgp->irq_deassert);
            if (!myri10ge_deassert_wait)
                  stats->valid = 0;
            mb();
      } else
            stats->valid = 0;

      /* Wait for IRQ line to go low, if using INTx */
      i = 0;
      while (1) {
            i++;
            /* check for transmit completes and receives */
            send_done_count = ntohl(stats->send_done_count);
            if (send_done_count != tx->pkt_done)
                  myri10ge_tx_done(mgp, (int)send_done_count);
            if (unlikely(i > myri10ge_max_irq_loops)) {
                  printk(KERN_WARNING "myri10ge: %s: irq stuck?\n",
                         mgp->dev->name);
                  stats->valid = 0;
                  schedule_work(&mgp->watchdog_work);
            }
            if (likely(stats->valid == 0))
                  break;
            cpu_relax();
            barrier();
      }

      myri10ge_check_statblock(mgp);

      __raw_writel(htonl(3), mgp->irq_claim + 1);
      return (IRQ_HANDLED);
}

static int
myri10ge_get_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
{
      cmd->autoneg = AUTONEG_DISABLE;
      cmd->speed = SPEED_10000;
      cmd->duplex = DUPLEX_FULL;
      return 0;
}

static void
myri10ge_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *info)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);

      strlcpy(info->driver, "myri10ge", sizeof(info->driver));
      strlcpy(info->version, MYRI10GE_VERSION_STR, sizeof(info->version));
      strlcpy(info->fw_version, mgp->fw_version, sizeof(info->fw_version));
      strlcpy(info->bus_info, pci_name(mgp->pdev), sizeof(info->bus_info));
}

static int
myri10ge_get_coalesce(struct net_device *netdev, struct ethtool_coalesce *coal)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);
      coal->rx_coalesce_usecs = mgp->intr_coal_delay;
      return 0;
}

static int
myri10ge_set_coalesce(struct net_device *netdev, struct ethtool_coalesce *coal)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);

      mgp->intr_coal_delay = coal->rx_coalesce_usecs;
      __raw_writel(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);
      return 0;
}

static void
myri10ge_get_pauseparam(struct net_device *netdev,
                  struct ethtool_pauseparam *pause)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);

      pause->autoneg = 0;
      pause->rx_pause = mgp->pause;
      pause->tx_pause = mgp->pause;
}

static int
myri10ge_set_pauseparam(struct net_device *netdev,
                  struct ethtool_pauseparam *pause)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);

      if (pause->tx_pause != mgp->pause)
            return myri10ge_change_pause(mgp, pause->tx_pause);
      if (pause->rx_pause != mgp->pause)
            return myri10ge_change_pause(mgp, pause->tx_pause);
      if (pause->autoneg != 0)
            return -EINVAL;
      return 0;
}

static void
myri10ge_get_ringparam(struct net_device *netdev,
                   struct ethtool_ringparam *ring)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);

      ring->rx_mini_max_pending = mgp->rx_small.mask + 1;
      ring->rx_max_pending = mgp->rx_big.mask + 1;
      ring->rx_jumbo_max_pending = 0;
      ring->tx_max_pending = mgp->rx_small.mask + 1;
      ring->rx_mini_pending = ring->rx_mini_max_pending;
      ring->rx_pending = ring->rx_max_pending;
      ring->rx_jumbo_pending = ring->rx_jumbo_max_pending;
      ring->tx_pending = ring->tx_max_pending;
}

static u32 myri10ge_get_rx_csum(struct net_device *netdev)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);
      if (mgp->csum_flag)
            return 1;
      else
            return 0;
}

static int myri10ge_set_rx_csum(struct net_device *netdev, u32 csum_enabled)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);
      if (csum_enabled)
            mgp->csum_flag = MXGEFW_FLAGS_CKSUM;
      else
            mgp->csum_flag = 0;
      return 0;
}

static const char myri10ge_gstrings_stats[][ETH_GSTRING_LEN] = {
      "rx_packets", "tx_packets", "rx_bytes", "tx_bytes", "rx_errors",
      "tx_errors", "rx_dropped", "tx_dropped", "multicast", "collisions",
      "rx_length_errors", "rx_over_errors", "rx_crc_errors",
      "rx_frame_errors", "rx_fifo_errors", "rx_missed_errors",
      "tx_aborted_errors", "tx_carrier_errors", "tx_fifo_errors",
      "tx_heartbeat_errors", "tx_window_errors",
      /* device-specific stats */
      "tx_boundary", "WC", "irq", "MSI",
      "read_dma_bw_MBs", "write_dma_bw_MBs", "read_write_dma_bw_MBs",
      "serial_number", "tx_pkt_start", "tx_pkt_done",
      "tx_req", "tx_done", "rx_small_cnt", "rx_big_cnt",
      "wake_queue", "stop_queue", "watchdog_resets", "tx_linearized",
      "link_up", "dropped_link_overflow", "dropped_link_error_or_filtered",
      "dropped_runt", "dropped_overrun", "dropped_no_small_buffer",
      "dropped_no_big_buffer"
};

#define MYRI10GE_NET_STATS_LEN      21
#define MYRI10GE_STATS_LEN  sizeof(myri10ge_gstrings_stats) / ETH_GSTRING_LEN

static void
myri10ge_get_strings(struct net_device *netdev, u32 stringset, u8 * data)
{
      switch (stringset) {
      case ETH_SS_STATS:
            memcpy(data, *myri10ge_gstrings_stats,
                   sizeof(myri10ge_gstrings_stats));
            break;
      }
}

static int myri10ge_get_stats_count(struct net_device *netdev)
{
      return MYRI10GE_STATS_LEN;
}

static void
myri10ge_get_ethtool_stats(struct net_device *netdev,
                     struct ethtool_stats *stats, u64 * data)
{
      struct myri10ge_priv *mgp = netdev_priv(netdev);
      int i;

      for (i = 0; i < MYRI10GE_NET_STATS_LEN; i++)
            data[i] = ((unsigned long *)&mgp->stats)[i];

      data[i++] = (unsigned int)mgp->tx.boundary;
      data[i++] = (unsigned int)(mgp->mtrr >= 0);
      data[i++] = (unsigned int)mgp->pdev->irq;
      data[i++] = (unsigned int)mgp->msi_enabled;
      data[i++] = (unsigned int)mgp->read_dma;
      data[i++] = (unsigned int)mgp->write_dma;
      data[i++] = (unsigned int)mgp->read_write_dma;
      data[i++] = (unsigned int)mgp->serial_number;
      data[i++] = (unsigned int)mgp->tx.pkt_start;
      data[i++] = (unsigned int)mgp->tx.pkt_done;
      data[i++] = (unsigned int)mgp->tx.req;
      data[i++] = (unsigned int)mgp->tx.done;
      data[i++] = (unsigned int)mgp->rx_small.cnt;
      data[i++] = (unsigned int)mgp->rx_big.cnt;
      data[i++] = (unsigned int)mgp->wake_queue;
      data[i++] = (unsigned int)mgp->stop_queue;
      data[i++] = (unsigned int)mgp->watchdog_resets;
      data[i++] = (unsigned int)mgp->tx_linearized;
      data[i++] = (unsigned int)ntohl(mgp->fw_stats->link_up);
      data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_link_overflow);
      data[i++] =
          (unsigned int)ntohl(mgp->fw_stats->dropped_link_error_or_filtered);
      data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_runt);
      data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_overrun);
      data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_no_small_buffer);
      data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_no_big_buffer);
}

static struct ethtool_ops myri10ge_ethtool_ops = {
      .get_settings = myri10ge_get_settings,
      .get_drvinfo = myri10ge_get_drvinfo,
      .get_coalesce = myri10ge_get_coalesce,
      .set_coalesce = myri10ge_set_coalesce,
      .get_pauseparam = myri10ge_get_pauseparam,
      .set_pauseparam = myri10ge_set_pauseparam,
      .get_ringparam = myri10ge_get_ringparam,
      .get_rx_csum = myri10ge_get_rx_csum,
      .set_rx_csum = myri10ge_set_rx_csum,
      .get_tx_csum = ethtool_op_get_tx_csum,
      .set_tx_csum = ethtool_op_set_tx_hw_csum,
      .get_sg = ethtool_op_get_sg,
      .set_sg = ethtool_op_set_sg,
#ifdef NETIF_F_TSO
      .get_tso = ethtool_op_get_tso,
      .set_tso = ethtool_op_set_tso,
#endif
      .get_strings = myri10ge_get_strings,
      .get_stats_count = myri10ge_get_stats_count,
      .get_ethtool_stats = myri10ge_get_ethtool_stats
};

static int myri10ge_allocate_rings(struct net_device *dev)
{
      struct myri10ge_priv *mgp;
      struct myri10ge_cmd cmd;
      int tx_ring_size, rx_ring_size;
      int tx_ring_entries, rx_ring_entries;
      int i, status;
      size_t bytes;

      mgp = netdev_priv(dev);

      /* get ring sizes */

      status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SEND_RING_SIZE, &cmd, 0);
      tx_ring_size = cmd.data0;
      status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_RX_RING_SIZE, &cmd, 0);
      rx_ring_size = cmd.data0;

      tx_ring_entries = tx_ring_size / sizeof(struct mcp_kreq_ether_send);
      rx_ring_entries = rx_ring_size / sizeof(struct mcp_dma_addr);
      mgp->tx.mask = tx_ring_entries - 1;
      mgp->rx_small.mask = mgp->rx_big.mask = rx_ring_entries - 1;

      /* allocate the host shadow rings */

      bytes = 8 + (MYRI10GE_MAX_SEND_DESC_TSO + 4)
          * sizeof(*mgp->tx.req_list);
      mgp->tx.req_bytes = kzalloc(bytes, GFP_KERNEL);
      if (mgp->tx.req_bytes == NULL)
            goto abort_with_nothing;

      /* ensure req_list entries are aligned to 8 bytes */
      mgp->tx.req_list = (struct mcp_kreq_ether_send *)
          ALIGN((unsigned long)mgp->tx.req_bytes, 8);

      bytes = rx_ring_entries * sizeof(*mgp->rx_small.shadow);
      mgp->rx_small.shadow = kzalloc(bytes, GFP_KERNEL);
      if (mgp->rx_small.shadow == NULL)
            goto abort_with_tx_req_bytes;

      bytes = rx_ring_entries * sizeof(*mgp->rx_big.shadow);
      mgp->rx_big.shadow = kzalloc(bytes, GFP_KERNEL);
      if (mgp->rx_big.shadow == NULL)
            goto abort_with_rx_small_shadow;

      /* allocate the host info rings */

      bytes = tx_ring_entries * sizeof(*mgp->tx.info);
      mgp->tx.info = kzalloc(bytes, GFP_KERNEL);
      if (mgp->tx.info == NULL)
            goto abort_with_rx_big_shadow;

      bytes = rx_ring_entries * sizeof(*mgp->rx_small.info);
      mgp->rx_small.info = kzalloc(bytes, GFP_KERNEL);
      if (mgp->rx_small.info == NULL)
            goto abort_with_tx_info;

      bytes = rx_ring_entries * sizeof(*mgp->rx_big.info);
      mgp->rx_big.info = kzalloc(bytes, GFP_KERNEL);
      if (mgp->rx_big.info == NULL)
            goto abort_with_rx_small_info;

      /* Fill the receive rings */

      for (i = 0; i <= mgp->rx_small.mask; i++) {
            status = myri10ge_getbuf(&mgp->rx_small, mgp->pdev,
                               mgp->small_bytes, i);
            if (status) {
                  printk(KERN_ERR
                         "myri10ge: %s: alloced only %d small bufs\n",
                         dev->name, i);
                  goto abort_with_rx_small_ring;
            }
      }

      for (i = 0; i <= mgp->rx_big.mask; i++) {
            status =
                myri10ge_getbuf(&mgp->rx_big, mgp->pdev,
                            dev->mtu + ETH_HLEN, i);
            if (status) {
                  printk(KERN_ERR
                         "myri10ge: %s: alloced only %d big bufs\n",
                         dev->name, i);
                  goto abort_with_rx_big_ring;
            }
      }

      return 0;

abort_with_rx_big_ring:
      for (i = 0; i <= mgp->rx_big.mask; i++) {
            if (mgp->rx_big.info[i].skb != NULL)
                  dev_kfree_skb_any(mgp->rx_big.info[i].skb);
            if (pci_unmap_len(&mgp->rx_big.info[i], len))
                  pci_unmap_single(mgp->pdev,
                               pci_unmap_addr(&mgp->rx_big.info[i],
                                          bus),
                               pci_unmap_len(&mgp->rx_big.info[i],
                                           len),
                               PCI_DMA_FROMDEVICE);
      }

abort_with_rx_small_ring:
      for (i = 0; i <= mgp->rx_small.mask; i++) {
            if (mgp->rx_small.info[i].skb != NULL)
                  dev_kfree_skb_any(mgp->rx_small.info[i].skb);
            if (pci_unmap_len(&mgp->rx_small.info[i], len))
                  pci_unmap_single(mgp->pdev,
                               pci_unmap_addr(&mgp->rx_small.info[i],
                                          bus),
                               pci_unmap_len(&mgp->rx_small.info[i],
                                           len),
                               PCI_DMA_FROMDEVICE);
      }
      kfree(mgp->rx_big.info);

abort_with_rx_small_info:
      kfree(mgp->rx_small.info);

abort_with_tx_info:
      kfree(mgp->tx.info);

abort_with_rx_big_shadow:
      kfree(mgp->rx_big.shadow);

abort_with_rx_small_shadow:
      kfree(mgp->rx_small.shadow);

abort_with_tx_req_bytes:
      kfree(mgp->tx.req_bytes);
      mgp->tx.req_bytes = NULL;
      mgp->tx.req_list = NULL;

abort_with_nothing:
      return status;
}

static void myri10ge_free_rings(struct net_device *dev)
{
      struct myri10ge_priv *mgp;
      struct sk_buff *skb;
      struct myri10ge_tx_buf *tx;
      int i, len, idx;

      mgp = netdev_priv(dev);

      for (i = 0; i <= mgp->rx_big.mask; i++) {
            if (mgp->rx_big.info[i].skb != NULL)
                  dev_kfree_skb_any(mgp->rx_big.info[i].skb);
            if (pci_unmap_len(&mgp->rx_big.info[i], len))
                  pci_unmap_single(mgp->pdev,
                               pci_unmap_addr(&mgp->rx_big.info[i],
                                          bus),
                               pci_unmap_len(&mgp->rx_big.info[i],
                                           len),
                               PCI_DMA_FROMDEVICE);
      }

      for (i = 0; i <= mgp->rx_small.mask; i++) {
            if (mgp->rx_small.info[i].skb != NULL)
                  dev_kfree_skb_any(mgp->rx_small.info[i].skb);
            if (pci_unmap_len(&mgp->rx_small.info[i], len))
                  pci_unmap_single(mgp->pdev,
                               pci_unmap_addr(&mgp->rx_small.info[i],
                                          bus),
                               pci_unmap_len(&mgp->rx_small.info[i],
                                           len),
                               PCI_DMA_FROMDEVICE);
      }

      tx = &mgp->tx;
      while (tx->done != tx->req) {
            idx = tx->done & tx->mask;
            skb = tx->info[idx].skb;

            /* Mark as free */
            tx->info[idx].skb = NULL;
            tx->done++;
            len = pci_unmap_len(&tx->info[idx], len);
            pci_unmap_len_set(&tx->info[idx], len, 0);
            if (skb) {
                  mgp->stats.tx_dropped++;
                  dev_kfree_skb_any(skb);
                  if (len)
                        pci_unmap_single(mgp->pdev,
                                     pci_unmap_addr(&tx->info[idx],
                                                bus), len,
                                     PCI_DMA_TODEVICE);
            } else {
                  if (len)
                        pci_unmap_page(mgp->pdev,
                                     pci_unmap_addr(&tx->info[idx],
                                                bus), len,
                                     PCI_DMA_TODEVICE);
            }
      }
      kfree(mgp->rx_big.info);

      kfree(mgp->rx_small.info);

      kfree(mgp->tx.info);

      kfree(mgp->rx_big.shadow);

      kfree(mgp->rx_small.shadow);

      kfree(mgp->tx.req_bytes);
      mgp->tx.req_bytes = NULL;
      mgp->tx.req_list = NULL;
}

static int myri10ge_open(struct net_device *dev)
{
      struct myri10ge_priv *mgp;
      struct myri10ge_cmd cmd;
      int status, big_pow2;

      mgp = netdev_priv(dev);

      if (mgp->running != MYRI10GE_ETH_STOPPED)
            return -EBUSY;

      mgp->running = MYRI10GE_ETH_STARTING;
      status = myri10ge_reset(mgp);
      if (status != 0) {
            printk(KERN_ERR "myri10ge: %s: failed reset\n", dev->name);
            mgp->running = MYRI10GE_ETH_STOPPED;
            return -ENXIO;
      }

      /* decide what small buffer size to use.  For good TCP rx
       * performance, it is important to not receive 1514 byte
       * frames into jumbo buffers, as it confuses the socket buffer
       * accounting code, leading to drops and erratic performance.
       */

      if (dev->mtu <= ETH_DATA_LEN)
            mgp->small_bytes = 128; /* enough for a TCP header */
      else
            mgp->small_bytes = ETH_FRAME_LEN;   /* enough for an ETH_DATA_LEN frame */

      /* Override the small buffer size? */
      if (myri10ge_small_bytes > 0)
            mgp->small_bytes = myri10ge_small_bytes;

      /* If the user sets an obscenely small MTU, adjust the small
       * bytes down to nearly nothing */
      if (mgp->small_bytes >= (dev->mtu + ETH_HLEN))
            mgp->small_bytes = 64;

      /* get the lanai pointers to the send and receive rings */

      status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SEND_OFFSET, &cmd, 0);
      mgp->tx.lanai =
          (struct mcp_kreq_ether_send __iomem *)(mgp->sram + cmd.data0);

      status |=
          myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SMALL_RX_OFFSET, &cmd, 0);
      mgp->rx_small.lanai =
          (struct mcp_kreq_ether_recv __iomem *)(mgp->sram + cmd.data0);

      status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_BIG_RX_OFFSET, &cmd, 0);
      mgp->rx_big.lanai =
          (struct mcp_kreq_ether_recv __iomem *)(mgp->sram + cmd.data0);

      if (status != 0) {
            printk(KERN_ERR
                   "myri10ge: %s: failed to get ring sizes or locations\n",
                   dev->name);
            mgp->running = MYRI10GE_ETH_STOPPED;
            return -ENXIO;
      }

      if (mgp->mtrr >= 0) {
            mgp->tx.wc_fifo = (u8 __iomem *) mgp->sram + 0x200000;
            mgp->rx_small.wc_fifo = (u8 __iomem *) mgp->sram + 0x300000;
            mgp->rx_big.wc_fifo = (u8 __iomem *) mgp->sram + 0x340000;
      } else {
            mgp->tx.wc_fifo = NULL;
            mgp->rx_small.wc_fifo = NULL;
            mgp->rx_big.wc_fifo = NULL;
      }

      status = myri10ge_allocate_rings(dev);
      if (status != 0)
            goto abort_with_nothing;

      /* Firmware needs the big buff size as a power of 2.  Lie and
       * tell him the buffer is larger, because we only use 1
       * buffer/pkt, and the mtu will prevent overruns.
       */
      big_pow2 = dev->mtu + ETH_HLEN + MXGEFW_PAD;
      while ((big_pow2 & (big_pow2 - 1)) != 0)
            big_pow2++;

      /* now give firmware buffers sizes, and MTU */
      cmd.data0 = dev->mtu + ETH_HLEN + VLAN_HLEN;
      status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_MTU, &cmd, 0);
      cmd.data0 = mgp->small_bytes;
      status |=
          myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_SMALL_BUFFER_SIZE, &cmd, 0);
      cmd.data0 = big_pow2;
      status |=
          myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_BIG_BUFFER_SIZE, &cmd, 0);
      if (status) {
            printk(KERN_ERR "myri10ge: %s: Couldn't set buffer sizes\n",
                   dev->name);
            goto abort_with_rings;
      }

      cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->fw_stats_bus);
      cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->fw_stats_bus);
      status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_STATS_DMA, &cmd, 0);
      if (status) {
            printk(KERN_ERR "myri10ge: %s: Couldn't set stats DMA\n",
                   dev->name);
            goto abort_with_rings;
      }

      mgp->link_state = -1;
      mgp->rdma_tags_available = 15;

      netif_poll_enable(mgp->dev);  /* must happen prior to any irq */

      status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ETHERNET_UP, &cmd, 0);
      if (status) {
            printk(KERN_ERR "myri10ge: %s: Couldn't bring up link\n",
                   dev->name);
            goto abort_with_rings;
      }

      mgp->wake_queue = 0;
      mgp->stop_queue = 0;
      mgp->running = MYRI10GE_ETH_RUNNING;
      mgp->watchdog_timer.expires = jiffies + myri10ge_watchdog_timeout * HZ;
      add_timer(&mgp->watchdog_timer);
      netif_wake_queue(dev);
      return 0;

abort_with_rings:
      myri10ge_free_rings(dev);

abort_with_nothing:
      mgp->running = MYRI10GE_ETH_STOPPED;
      return -ENOMEM;
}

static int myri10ge_close(struct net_device *dev)
{
      struct myri10ge_priv *mgp;
      struct myri10ge_cmd cmd;
      int status, old_down_cnt;

      mgp = netdev_priv(dev);

      if (mgp->running != MYRI10GE_ETH_RUNNING)
            return 0;

      if (mgp->tx.req_bytes == NULL)
            return 0;

      del_timer_sync(&mgp->watchdog_timer);
      mgp->running = MYRI10GE_ETH_STOPPING;
      netif_poll_disable(mgp->dev);
      netif_carrier_off(dev);
      netif_stop_queue(dev);
      old_down_cnt = mgp->down_cnt;
      mb();
      status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ETHERNET_DOWN, &cmd, 0);
      if (status)
            printk(KERN_ERR "myri10ge: %s: Couldn't bring down link\n",
                   dev->name);

      wait_event_timeout(mgp->down_wq, old_down_cnt != mgp->down_cnt, HZ);
      if (old_down_cnt == mgp->down_cnt)
            printk(KERN_ERR "myri10ge: %s never got down irq\n", dev->name);

      netif_tx_disable(dev);

      myri10ge_free_rings(dev);

      mgp->running = MYRI10GE_ETH_STOPPED;
      return 0;
}

/* copy an array of struct mcp_kreq_ether_send's to the mcp.  Copy
 * backwards one at a time and handle ring wraps */

static inline void
myri10ge_submit_req_backwards(struct myri10ge_tx_buf *tx,
                        struct mcp_kreq_ether_send *src, int cnt)
{
      int idx, starting_slot;
      starting_slot = tx->req;
      while (cnt > 1) {
            cnt--;
            idx = (starting_slot + cnt) & tx->mask;
            myri10ge_pio_copy(&tx->lanai[idx], &src[cnt], sizeof(*src));
            mb();
      }
}

/*
 * copy an array of struct mcp_kreq_ether_send's to the mcp.  Copy
 * at most 32 bytes at a time, so as to avoid involving the software
 * pio handler in the nic.   We re-write the first segment's flags
 * to mark them valid only after writing the entire chain.
 */

static inline void
myri10ge_submit_req(struct myri10ge_tx_buf *tx, struct mcp_kreq_ether_send *src,
                int cnt)
{
      int idx, i;
      struct mcp_kreq_ether_send __iomem *dstp, *dst;
      struct mcp_kreq_ether_send *srcp;
      u8 last_flags;

      idx = tx->req & tx->mask;

      last_flags = src->flags;
      src->flags = 0;
      mb();
      dst = dstp = &tx->lanai[idx];
      srcp = src;

      if ((idx + cnt) < tx->mask) {
            for (i = 0; i < (cnt - 1); i += 2) {
                  myri10ge_pio_copy(dstp, srcp, 2 * sizeof(*src));
                  mb(); /* force write every 32 bytes */
                  srcp += 2;
                  dstp += 2;
            }
      } else {
            /* submit all but the first request, and ensure
             * that it is submitted below */
            myri10ge_submit_req_backwards(tx, src, cnt);
            i = 0;
      }
      if (i < cnt) {
            /* submit the first request */
            myri10ge_pio_copy(dstp, srcp, sizeof(*src));
            mb();       /* barrier before setting valid flag */
      }

      /* re-write the last 32-bits with the valid flags */
      src->flags = last_flags;
      __raw_writel(*((u32 *) src + 3), (u32 __iomem *) dst + 3);
      tx->req += cnt;
      mb();
}

static inline void
myri10ge_submit_req_wc(struct myri10ge_tx_buf *tx,
                   struct mcp_kreq_ether_send *src, int cnt)
{
      tx->req += cnt;
      mb();
      while (cnt >= 4) {
            myri10ge_pio_copy(tx->wc_fifo, src, 64);
            mb();
            src += 4;
            cnt -= 4;
      }
      if (cnt > 0) {
            /* pad it to 64 bytes.  The src is 64 bytes bigger than it
             * needs to be so that we don't overrun it */
            myri10ge_pio_copy(tx->wc_fifo + (cnt << 18), src, 64);
            mb();
      }
}

/*
 * Transmit a packet.  We need to split the packet so that a single
 * segment does not cross myri10ge->tx.boundary, so this makes segment
 * counting tricky.  So rather than try to count segments up front, we
 * just give up if there are too few segments to hold a reasonably
 * fragmented packet currently available.  If we run
 * out of segments while preparing a packet for DMA, we just linearize
 * it and try again.
 */

static int myri10ge_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct myri10ge_priv *mgp = netdev_priv(dev);
      struct mcp_kreq_ether_send *req;
      struct myri10ge_tx_buf *tx = &mgp->tx;
      struct skb_frag_struct *frag;
      dma_addr_t bus;
      u32 low, high_swapped;
      unsigned int len;
      int idx, last_idx, avail, frag_cnt, frag_idx, count, mss, max_segments;
      u16 pseudo_hdr_offset, cksum_offset;
      int cum_len, seglen, boundary, rdma_count;
      u8 flags, odd_flag;

again:
      req = tx->req_list;
      avail = tx->mask - 1 - (tx->req - tx->done);

      mss = 0;
      max_segments = MXGEFW_MAX_SEND_DESC;

#ifdef NETIF_F_TSO
      if (skb->len > (dev->mtu + ETH_HLEN)) {
            mss = skb_shinfo(skb)->gso_size;
            if (mss != 0)
                  max_segments = MYRI10GE_MAX_SEND_DESC_TSO;
      }
#endif                        /*NETIF_F_TSO */

      if ((unlikely(avail < max_segments))) {
            /* we are out of transmit resources */
            mgp->stop_queue++;
            netif_stop_queue(dev);
            return 1;
      }

      /* Setup checksum offloading, if needed */
      cksum_offset = 0;
      pseudo_hdr_offset = 0;
      odd_flag = 0;
      flags = (MXGEFW_FLAGS_NO_TSO | MXGEFW_FLAGS_FIRST);
      if (likely(skb->ip_summed == CHECKSUM_HW)) {
            cksum_offset = (skb->h.raw - skb->data);
            pseudo_hdr_offset = (skb->h.raw + skb->csum) - skb->data;
            /* If the headers are excessively large, then we must
             * fall back to a software checksum */
            if (unlikely(cksum_offset > 255 || pseudo_hdr_offset > 127)) {
                  if (skb_checksum_help(skb, 0))
                        goto drop;
                  cksum_offset = 0;
                  pseudo_hdr_offset = 0;
            } else {
                  pseudo_hdr_offset = htons(pseudo_hdr_offset);
                  odd_flag = MXGEFW_FLAGS_ALIGN_ODD;
                  flags |= MXGEFW_FLAGS_CKSUM;
            }
      }

      cum_len = 0;

#ifdef NETIF_F_TSO
      if (mss) {        /* TSO */
            /* this removes any CKSUM flag from before */
            flags = (MXGEFW_FLAGS_TSO_HDR | MXGEFW_FLAGS_FIRST);

            /* negative cum_len signifies to the
             * send loop that we are still in the
             * header portion of the TSO packet.
             * TSO header must be at most 134 bytes long */
            cum_len = -((skb->h.raw - skb->data) + (skb->h.th->doff << 2));

            /* for TSO, pseudo_hdr_offset holds mss.
             * The firmware figures out where to put
             * the checksum by parsing the header. */
            pseudo_hdr_offset = htons(mss);
      } else
#endif                        /*NETIF_F_TSO */
            /* Mark small packets, and pad out tiny packets */
      if (skb->len <= MXGEFW_SEND_SMALL_SIZE) {
            flags |= MXGEFW_FLAGS_SMALL;

            /* pad frames to at least ETH_ZLEN bytes */
            if (unlikely(skb->len < ETH_ZLEN)) {
                  if (skb_padto(skb, ETH_ZLEN)) {
                        /* The packet is gone, so we must
                         * return 0 */
                        mgp->stats.tx_dropped += 1;
                        return 0;
                  }
                  /* adjust the len to account for the zero pad
                   * so that the nic can know how long it is */
                  skb->len = ETH_ZLEN;
            }
      }

      /* map the skb for DMA */
      len = skb->len - skb->data_len;
      idx = tx->req & tx->mask;
      tx->info[idx].skb = skb;
      bus = pci_map_single(mgp->pdev, skb->data, len, PCI_DMA_TODEVICE);
      pci_unmap_addr_set(&tx->info[idx], bus, bus);
      pci_unmap_len_set(&tx->info[idx], len, len);

      frag_cnt = skb_shinfo(skb)->nr_frags;
      frag_idx = 0;
      count = 0;
      rdma_count = 0;

      /* "rdma_count" is the number of RDMAs belonging to the
       * current packet BEFORE the current send request. For
       * non-TSO packets, this is equal to "count".
       * For TSO packets, rdma_count needs to be reset
       * to 0 after a segment cut.
       *
       * The rdma_count field of the send request is
       * the number of RDMAs of the packet starting at
       * that request. For TSO send requests with one ore more cuts
       * in the middle, this is the number of RDMAs starting
       * after the last cut in the request. All previous
       * segments before the last cut implicitly have 1 RDMA.
       *
       * Since the number of RDMAs is not known beforehand,
       * it must be filled-in retroactively - after each
       * segmentation cut or at the end of the entire packet.
       */

      while (1) {
            /* Break the SKB or Fragment up into pieces which
             * do not cross mgp->tx.boundary */
            low = MYRI10GE_LOWPART_TO_U32(bus);
            high_swapped = htonl(MYRI10GE_HIGHPART_TO_U32(bus));
            while (len) {
                  u8 flags_next;
                  int cum_len_next;

                  if (unlikely(count == max_segments))
                        goto abort_linearize;

                  boundary = (low + tx->boundary) & ~(tx->boundary - 1);
                  seglen = boundary - low;
                  if (seglen > len)
                        seglen = len;
                  flags_next = flags & ~MXGEFW_FLAGS_FIRST;
                  cum_len_next = cum_len + seglen;
#ifdef NETIF_F_TSO
                  if (mss) {  /* TSO */
                        (req - rdma_count)->rdma_count = rdma_count + 1;

                        if (likely(cum_len >= 0)) {   /* payload */
                              int next_is_first, chop;

                              chop = (cum_len_next > mss);
                              cum_len_next = cum_len_next % mss;
                              next_is_first = (cum_len_next == 0);
                              flags |= chop * MXGEFW_FLAGS_TSO_CHOP;
                              flags_next |= next_is_first *
                                  MXGEFW_FLAGS_FIRST;
                              rdma_count |= -(chop | next_is_first);
                              rdma_count += chop & !next_is_first;
                        } else if (likely(cum_len_next >= 0)) {   /* header ends */
                              int small;

                              rdma_count = -1;
                              cum_len_next = 0;
                              seglen = -cum_len;
                              small = (mss <= MXGEFW_SEND_SMALL_SIZE);
                              flags_next = MXGEFW_FLAGS_TSO_PLD |
                                  MXGEFW_FLAGS_FIRST |
                                  (small * MXGEFW_FLAGS_SMALL);
                        }
                  }
#endif                        /* NETIF_F_TSO */
                  req->addr_high = high_swapped;
                  req->addr_low = htonl(low);
                  req->pseudo_hdr_offset = pseudo_hdr_offset;
                  req->pad = 0;     /* complete solid 16-byte block; does this matter? */
                  req->rdma_count = 1;
                  req->length = htons(seglen);
                  req->cksum_offset = cksum_offset;
                  req->flags = flags | ((cum_len & 1) * odd_flag);

                  low += seglen;
                  len -= seglen;
                  cum_len = cum_len_next;
                  flags = flags_next;
                  req++;
                  count++;
                  rdma_count++;
                  if (unlikely(cksum_offset > seglen))
                        cksum_offset -= seglen;
                  else
                        cksum_offset = 0;
            }
            if (frag_idx == frag_cnt)
                  break;

            /* map next fragment for DMA */
            idx = (count + tx->req) & tx->mask;
            frag = &skb_shinfo(skb)->frags[frag_idx];
            frag_idx++;
            len = frag->size;
            bus = pci_map_page(mgp->pdev, frag->page, frag->page_offset,
                           len, PCI_DMA_TODEVICE);
            pci_unmap_addr_set(&tx->info[idx], bus, bus);
            pci_unmap_len_set(&tx->info[idx], len, len);
      }

      (req - rdma_count)->rdma_count = rdma_count;
#ifdef NETIF_F_TSO
      if (mss)
            do {
                  req--;
                  req->flags |= MXGEFW_FLAGS_TSO_LAST;
            } while (!(req->flags & (MXGEFW_FLAGS_TSO_CHOP |
                               MXGEFW_FLAGS_FIRST)));
#endif
      idx = ((count - 1) + tx->req) & tx->mask;
      tx->info[idx].last = 1;
      if (tx->wc_fifo == NULL)
            myri10ge_submit_req(tx, tx->req_list, count);
      else
            myri10ge_submit_req_wc(tx, tx->req_list, count);
      tx->pkt_start++;
      if ((avail - count) < MXGEFW_MAX_SEND_DESC) {
            mgp->stop_queue++;
            netif_stop_queue(dev);
      }
      dev->trans_start = jiffies;
      return 0;

abort_linearize:
      /* Free any DMA resources we've alloced and clear out the skb
       * slot so as to not trip up assertions, and to avoid a
       * double-free if linearizing fails */

      last_idx = (idx + 1) & tx->mask;
      idx = tx->req & tx->mask;
      tx->info[idx].skb = NULL;
      do {
            len = pci_unmap_len(&tx->info[idx], len);
            if (len) {
                  if (tx->info[idx].skb != NULL)
                        pci_unmap_single(mgp->pdev,
                                     pci_unmap_addr(&tx->info[idx],
                                                bus), len,
                                     PCI_DMA_TODEVICE);
                  else
                        pci_unmap_page(mgp->pdev,
                                     pci_unmap_addr(&tx->info[idx],
                                                bus), len,
                                     PCI_DMA_TODEVICE);
                  pci_unmap_len_set(&tx->info[idx], len, 0);
                  tx->info[idx].skb = NULL;
            }
            idx = (idx + 1) & tx->mask;
      } while (idx != last_idx);
      if (skb_is_gso(skb)) {
            printk(KERN_ERR
                   "myri10ge: %s: TSO but wanted to linearize?!?!?\n",
                   mgp->dev->name);
            goto drop;
      }

      if (skb_linearize(skb))
            goto drop;

      mgp->tx_linearized++;
      goto again;

drop:
      dev_kfree_skb_any(skb);
      mgp->stats.tx_dropped += 1;
      return 0;

}

static struct net_device_stats *myri10ge_get_stats(struct net_device *dev)
{
      struct myri10ge_priv *mgp = netdev_priv(dev);
      return &mgp->stats;
}

static void myri10ge_set_multicast_list(struct net_device *dev)
{
      /* can be called from atomic contexts,
       * pass 1 to force atomicity in myri10ge_send_cmd() */
      myri10ge_change_promisc(netdev_priv(dev), dev->flags & IFF_PROMISC, 1);
}

static int myri10ge_set_mac_address(struct net_device *dev, void *addr)
{
      struct sockaddr *sa = addr;
      struct myri10ge_priv *mgp = netdev_priv(dev);
      int status;

      if (!is_valid_ether_addr(sa->sa_data))
            return -EADDRNOTAVAIL;

      status = myri10ge_update_mac_address(mgp, sa->sa_data);
      if (status != 0) {
            printk(KERN_ERR
                   "myri10ge: %s: changing mac address failed with %d\n",
                   dev->name, status);
            return status;
      }

      /* change the dev structure */
      memcpy(dev->dev_addr, sa->sa_data, 6);
      return 0;
}

static int myri10ge_change_mtu(struct net_device *dev, int new_mtu)
{
      struct myri10ge_priv *mgp = netdev_priv(dev);
      int error = 0;

      if ((new_mtu < 68) || (ETH_HLEN + new_mtu > MYRI10GE_MAX_ETHER_MTU)) {
            printk(KERN_ERR "myri10ge: %s: new mtu (%d) is not valid\n",
                   dev->name, new_mtu);
            return -EINVAL;
      }
      printk(KERN_INFO "%s: changing mtu from %d to %d\n",
             dev->name, dev->mtu, new_mtu);
      if (mgp->running) {
            /* if we change the mtu on an active device, we must
             * reset the device so the firmware sees the change */
            myri10ge_close(dev);
            dev->mtu = new_mtu;
            myri10ge_open(dev);
      } else
            dev->mtu = new_mtu;

      return error;
}

/*
 * Enable ECRC to align PCI-E Completion packets on an 8-byte boundary.
 * Only do it if the bridge is a root port since we don't want to disturb
 * any other device, except if forced with myri10ge_ecrc_enable > 1.
 */

static void myri10ge_enable_ecrc(struct myri10ge_priv *mgp)
{
      struct pci_dev *bridge = mgp->pdev->bus->self;
      struct device *dev = &mgp->pdev->dev;
      unsigned cap;
      unsigned err_cap;
      u16 val;
      u8 ext_type;
      int ret;

      if (!myri10ge_ecrc_enable || !bridge)
            return;

      /* check that the bridge is a root port */
      cap = pci_find_capability(bridge, PCI_CAP_ID_EXP);
      pci_read_config_word(bridge, cap + PCI_CAP_FLAGS, &val);
      ext_type = (val & PCI_EXP_FLAGS_TYPE) >> 4;
      if (ext_type != PCI_EXP_TYPE_ROOT_PORT) {
            if (myri10ge_ecrc_enable > 1) {
                  struct pci_dev *old_bridge = bridge;

                  /* Walk the hierarchy up to the root port
                   * where ECRC has to be enabled */
                  do {
                        bridge = bridge->bus->self;
                        if (!bridge) {
                              dev_err(dev,
                                    "Failed to find root port"
                                    " to force ECRC\n");
                              return;
                        }
                        cap =
                            pci_find_capability(bridge, PCI_CAP_ID_EXP);
                        pci_read_config_word(bridge,
                                         cap + PCI_CAP_FLAGS, &val);
                        ext_type = (val & PCI_EXP_FLAGS_TYPE) >> 4;
                  } while (ext_type != PCI_EXP_TYPE_ROOT_PORT);

                  dev_info(dev,
                         "Forcing ECRC on non-root port %s"
                         " (enabling on root port %s)\n",
                         pci_name(old_bridge), pci_name(bridge));
            } else {
                  dev_err(dev,
                        "Not enabling ECRC on non-root port %s\n",
                        pci_name(bridge));
                  return;
            }
      }

      cap = pci_find_ext_capability(bridge, PCI_EXT_CAP_ID_ERR);
      if (!cap)
            return;

      ret = pci_read_config_dword(bridge, cap + PCI_ERR_CAP, &err_cap);
      if (ret) {
            dev_err(dev, "failed reading ext-conf-space of %s\n",
                  pci_name(bridge));
            dev_err(dev, "\t pci=nommconf in use? "
                  "or buggy/incomplete/absent ACPI MCFG attr?\n");
            return;
      }
      if (!(err_cap & PCI_ERR_CAP_ECRC_GENC))
            return;

      err_cap |= PCI_ERR_CAP_ECRC_GENE;
      pci_write_config_dword(bridge, cap + PCI_ERR_CAP, err_cap);
      dev_info(dev, "Enabled ECRC on upstream bridge %s\n", pci_name(bridge));
      mgp->tx.boundary = 4096;
      mgp->fw_name = myri10ge_fw_aligned;
}

/*
 * The Lanai Z8E PCI-E interface achieves higher Read-DMA throughput
 * when the PCI-E Completion packets are aligned on an 8-byte
 * boundary.  Some PCI-E chip sets always align Completion packets; on
 * the ones that do not, the alignment can be enforced by enabling
 * ECRC generation (if supported).
 *
 * When PCI-E Completion packets are not aligned, it is actually more
 * efficient to limit Read-DMA transactions to 2KB, rather than 4KB.
 *
 * If the driver can neither enable ECRC nor verify that it has
 * already been enabled, then it must use a firmware image which works
 * around unaligned completion packets (myri10ge_ethp_z8e.dat), and it
 * should also ensure that it never gives the device a Read-DMA which is
 * larger than 2KB by setting the tx.boundary to 2KB.  If ECRC is
 * enabled, then the driver should use the aligned (myri10ge_eth_z8e.dat)
 * firmware image, and set tx.boundary to 4KB.
 */

#define PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE   0x0132

static void myri10ge_select_firmware(struct myri10ge_priv *mgp)
{
      struct pci_dev *bridge = mgp->pdev->bus->self;

      mgp->tx.boundary = 2048;
      mgp->fw_name = myri10ge_fw_unaligned;

      if (myri10ge_force_firmware == 0) {
            myri10ge_enable_ecrc(mgp);

            /* Check to see if the upstream bridge is known to
             * provide aligned completions */
            if (bridge
                /* ServerWorks HT2000/HT1000 */
                && bridge->vendor == PCI_VENDOR_ID_SERVERWORKS
                && bridge->device ==
                PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE) {
                  dev_info(&mgp->pdev->dev,
                         "Assuming aligned completions (0x%x:0x%x)\n",
                         bridge->vendor, bridge->device);
                  mgp->tx.boundary = 4096;
                  mgp->fw_name = myri10ge_fw_aligned;
            }
      } else {
            if (myri10ge_force_firmware == 1) {
                  dev_info(&mgp->pdev->dev,
                         "Assuming aligned completions (forced)\n");
                  mgp->tx.boundary = 4096;
                  mgp->fw_name = myri10ge_fw_aligned;
            } else {
                  dev_info(&mgp->pdev->dev,
                         "Assuming unaligned completions (forced)\n");
                  mgp->tx.boundary = 2048;
                  mgp->fw_name = myri10ge_fw_unaligned;
            }
      }
      if (myri10ge_fw_name != NULL) {
            dev_info(&mgp->pdev->dev, "overriding firmware to %s\n",
                   myri10ge_fw_name);
            mgp->fw_name = myri10ge_fw_name;
      }
}

static void myri10ge_save_state(struct myri10ge_priv *mgp)
{
      struct pci_dev *pdev = mgp->pdev;
      int cap;

      pci_save_state(pdev);
      /* now save PCIe and MSI state that Linux will not
       * save for us */
      cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
      pci_read_config_dword(pdev, cap + PCI_EXP_DEVCTL, &mgp->devctl);
      cap = pci_find_capability(pdev, PCI_CAP_ID_MSI);
      pci_read_config_word(pdev, cap + PCI_MSI_FLAGS, &mgp->msi_flags);
}

static void myri10ge_restore_state(struct myri10ge_priv *mgp)
{
      struct pci_dev *pdev = mgp->pdev;
      int cap;

      /* restore PCIe and MSI state that linux will not */
      cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
      pci_write_config_dword(pdev, cap + PCI_CAP_ID_EXP, mgp->devctl);
      cap = pci_find_capability(pdev, PCI_CAP_ID_MSI);
      pci_write_config_word(pdev, cap + PCI_MSI_FLAGS, mgp->msi_flags);

      pci_restore_state(pdev);
}

#ifdef CONFIG_PM

static int myri10ge_suspend(struct pci_dev *pdev, pm_message_t state)
{
      struct myri10ge_priv *mgp;
      struct net_device *netdev;

      mgp = pci_get_drvdata(pdev);
      if (mgp == NULL)
            return -EINVAL;
      netdev = mgp->dev;

      netif_device_detach(netdev);
      if (netif_running(netdev)) {
            printk(KERN_INFO "myri10ge: closing %s\n", netdev->name);
            rtnl_lock();
            myri10ge_close(netdev);
            rtnl_unlock();
      }
      myri10ge_dummy_rdma(mgp, 0);
      free_irq(pdev->irq, mgp);
      myri10ge_save_state(mgp);
      pci_disable_device(pdev);
      pci_set_power_state(pdev, pci_choose_state(pdev, state));
      return 0;
}

static int myri10ge_resume(struct pci_dev *pdev)
{
      struct myri10ge_priv *mgp;
      struct net_device *netdev;
      int status;
      u16 vendor;

      mgp = pci_get_drvdata(pdev);
      if (mgp == NULL)
            return -EINVAL;
      netdev = mgp->dev;
      pci_set_power_state(pdev, 0); /* zeros conf space as a side effect */
      msleep(5);        /* give card time to respond */
      pci_read_config_word(mgp->pdev, PCI_VENDOR_ID, &vendor);
      if (vendor == 0xffff) {
            printk(KERN_ERR "myri10ge: %s: device disappeared!\n",
                   mgp->dev->name);
            return -EIO;
      }
      myri10ge_restore_state(mgp);

      status = pci_enable_device(pdev);
      if (status < 0) {
            dev_err(&pdev->dev, "failed to enable device\n");
            return -EIO;
      }

      pci_set_master(pdev);

      status = request_irq(pdev->irq, myri10ge_intr, IRQF_SHARED,
                       netdev->name, mgp);
      if (status != 0) {
            dev_err(&pdev->dev, "failed to allocate IRQ\n");
            goto abort_with_enabled;
      }

      myri10ge_reset(mgp);
      myri10ge_dummy_rdma(mgp, 1);

      /* Save configuration space to be restored if the
       * nic resets due to a parity error */
      myri10ge_save_state(mgp);

      if (netif_running(netdev)) {
            rtnl_lock();
            myri10ge_open(netdev);
            rtnl_unlock();
      }
      netif_device_attach(netdev);

      return 0;

abort_with_enabled:
      pci_disable_device(pdev);
      return -EIO;

}

#endif                        /* CONFIG_PM */

static u32 myri10ge_read_reboot(struct myri10ge_priv *mgp)
{
      struct pci_dev *pdev = mgp->pdev;
      int vs = mgp->vendor_specific_offset;
      u32 reboot;

      /*enter read32 mode */
      pci_write_config_byte(pdev, vs + 0x10, 0x3);

      /*read REBOOT_STATUS (0xfffffff0) */
      pci_write_config_dword(pdev, vs + 0x18, 0xfffffff0);
      pci_read_config_dword(pdev, vs + 0x14, &reboot);
      return reboot;
}

/*
 * This watchdog is used to check whether the board has suffered
 * from a parity error and needs to be recovered.
 */
static void myri10ge_watchdog(void *arg)
{
      struct myri10ge_priv *mgp = arg;
      u32 reboot;
      int status;
      u16 cmd, vendor;

      mgp->watchdog_resets++;
      pci_read_config_word(mgp->pdev, PCI_COMMAND, &cmd);
      if ((cmd & PCI_COMMAND_MASTER) == 0) {
            /* Bus master DMA disabled?  Check to see
             * if the card rebooted due to a parity error
             * For now, just report it */
            reboot = myri10ge_read_reboot(mgp);
            printk(KERN_ERR
                   "myri10ge: %s: NIC rebooted (0x%x), resetting\n",
                   mgp->dev->name, reboot);
            /*
             * A rebooted nic will come back with config space as
             * it was after power was applied to PCIe bus.
             * Attempt to restore config space which was saved
             * when the driver was loaded, or the last time the
             * nic was resumed from power saving mode.
             */
            myri10ge_restore_state(mgp);
      } else {
            /* if we get back -1's from our slot, perhaps somebody
             * powered off our card.  Don't try to reset it in
             * this case */
            if (cmd == 0xffff) {
                  pci_read_config_word(mgp->pdev, PCI_VENDOR_ID, &vendor);
                  if (vendor == 0xffff) {
                        printk(KERN_ERR
                               "myri10ge: %s: device disappeared!\n",
                               mgp->dev->name);
                        return;
                  }
            }
            /* Perhaps it is a software error.  Try to reset */

            printk(KERN_ERR "myri10ge: %s: device timeout, resetting\n",
                   mgp->dev->name);
            printk(KERN_INFO "myri10ge: %s: %d %d %d %d %d\n",
                   mgp->dev->name, mgp->tx.req, mgp->tx.done,
                   mgp->tx.pkt_start, mgp->tx.pkt_done,
                   (int)ntohl(mgp->fw_stats->send_done_count));
            msleep(2000);
            printk(KERN_INFO "myri10ge: %s: %d %d %d %d %d\n",
                   mgp->dev->name, mgp->tx.req, mgp->tx.done,
                   mgp->tx.pkt_start, mgp->tx.pkt_done,
                   (int)ntohl(mgp->fw_stats->send_done_count));
      }
      rtnl_lock();
      myri10ge_close(mgp->dev);
      status = myri10ge_load_firmware(mgp);
      if (status != 0)
            printk(KERN_ERR "myri10ge: %s: failed to load firmware\n",
                   mgp->dev->name);
      else
            myri10ge_open(mgp->dev);
      rtnl_unlock();
}

/*
 * We use our own timer routine rather than relying upon
 * netdev->tx_timeout because we have a very large hardware transmit
 * queue.  Due to the large queue, the netdev->tx_timeout function
 * cannot detect a NIC with a parity error in a timely fashion if the
 * NIC is lightly loaded.
 */
static void myri10ge_watchdog_timer(unsigned long arg)
{
      struct myri10ge_priv *mgp;

      mgp = (struct myri10ge_priv *)arg;
      if (mgp->tx.req != mgp->tx.done &&
          mgp->tx.done == mgp->watchdog_tx_done &&
          mgp->watchdog_tx_req != mgp->watchdog_tx_done)
            /* nic seems like it might be stuck.. */
            schedule_work(&mgp->watchdog_work);
      else
            /* rearm timer */
            mod_timer(&mgp->watchdog_timer,
                    jiffies + myri10ge_watchdog_timeout * HZ);

      mgp->watchdog_tx_done = mgp->tx.done;
      mgp->watchdog_tx_req = mgp->tx.req;
}

static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
      struct net_device *netdev;
      struct myri10ge_priv *mgp;
      struct device *dev = &pdev->dev;
      size_t bytes;
      int i;
      int status = -ENXIO;
      int cap;
      int dac_enabled;
      u16 val;

      netdev = alloc_etherdev(sizeof(*mgp));
      if (netdev == NULL) {
            dev_err(dev, "Could not allocate ethernet device\n");
            return -ENOMEM;
      }

      mgp = netdev_priv(netdev);
      memset(mgp, 0, sizeof(*mgp));
      mgp->dev = netdev;
      mgp->pdev = pdev;
      mgp->csum_flag = MXGEFW_FLAGS_CKSUM;
      mgp->pause = myri10ge_flow_control;
      mgp->intr_coal_delay = myri10ge_intr_coal_delay;
      init_waitqueue_head(&mgp->down_wq);

      if (pci_enable_device(pdev)) {
            dev_err(&pdev->dev, "pci_enable_device call failed\n");
            status = -ENODEV;
            goto abort_with_netdev;
      }
      myri10ge_select_firmware(mgp);

      /* Find the vendor-specific cap so we can check
       * the reboot register later on */
      mgp->vendor_specific_offset
          = pci_find_capability(pdev, PCI_CAP_ID_VNDR);

      /* Set our max read request to 4KB */
      cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
      if (cap < 64) {
            dev_err(&pdev->dev, "Bad PCI_CAP_ID_EXP location %d\n", cap);
            goto abort_with_netdev;
      }
      status = pci_read_config_word(pdev, cap + PCI_EXP_DEVCTL, &val);
      if (status != 0) {
            dev_err(&pdev->dev, "Error %d reading PCI_EXP_DEVCTL\n",
                  status);
            goto abort_with_netdev;
      }
      val = (val & ~PCI_EXP_DEVCTL_READRQ) | (5 << 12);
      status = pci_write_config_word(pdev, cap + PCI_EXP_DEVCTL, val);
      if (status != 0) {
            dev_err(&pdev->dev, "Error %d writing PCI_EXP_DEVCTL\n",
                  status);
            goto abort_with_netdev;
      }

      pci_set_master(pdev);
      dac_enabled = 1;
      status = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
      if (status != 0) {
            dac_enabled = 0;
            dev_err(&pdev->dev,
                  "64-bit pci address mask was refused, trying 32-bit");
            status = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
      }
      if (status != 0) {
            dev_err(&pdev->dev, "Error %d setting DMA mask\n", status);
            goto abort_with_netdev;
      }
      mgp->cmd = dma_alloc_coherent(&pdev->dev, sizeof(*mgp->cmd),
                              &mgp->cmd_bus, GFP_KERNEL);
      if (mgp->cmd == NULL)
            goto abort_with_netdev;

      mgp->fw_stats = dma_alloc_coherent(&pdev->dev, sizeof(*mgp->fw_stats),
                                 &mgp->fw_stats_bus, GFP_KERNEL);
      if (mgp->fw_stats == NULL)
            goto abort_with_cmd;

      mgp->board_span = pci_resource_len(pdev, 0);
      mgp->iomem_base = pci_resource_start(pdev, 0);
      mgp->mtrr = -1;
#ifdef CONFIG_MTRR
      mgp->mtrr = mtrr_add(mgp->iomem_base, mgp->board_span,
                       MTRR_TYPE_WRCOMB, 1);
#endif
      /* Hack.  need to get rid of these magic numbers */
      mgp->sram_size =
          2 * 1024 * 1024 - (2 * (48 * 1024) + (32 * 1024)) - 0x100;
      if (mgp->sram_size > mgp->board_span) {
            dev_err(&pdev->dev, "board span %ld bytes too small\n",
                  mgp->board_span);
            goto abort_with_wc;
      }
      mgp->sram = ioremap(mgp->iomem_base, mgp->board_span);
      if (mgp->sram == NULL) {
            dev_err(&pdev->dev, "ioremap failed for %ld bytes at 0x%lx\n",
                  mgp->board_span, mgp->iomem_base);
            status = -ENXIO;
            goto abort_with_wc;
      }
      memcpy_fromio(mgp->eeprom_strings,
                  mgp->sram + mgp->sram_size - MYRI10GE_EEPROM_STRINGS_SIZE,
                  MYRI10GE_EEPROM_STRINGS_SIZE);
      memset(mgp->eeprom_strings + MYRI10GE_EEPROM_STRINGS_SIZE - 2, 0, 2);
      status = myri10ge_read_mac_addr(mgp);
      if (status)
            goto abort_with_ioremap;

      for (i = 0; i < ETH_ALEN; i++)
            netdev->dev_addr[i] = mgp->mac_addr[i];

      /* allocate rx done ring */
      bytes = myri10ge_max_intr_slots * sizeof(*mgp->rx_done.entry);
      mgp->rx_done.entry = dma_alloc_coherent(&pdev->dev, bytes,
                                    &mgp->rx_done.bus, GFP_KERNEL);
      if (mgp->rx_done.entry == NULL)
            goto abort_with_ioremap;
      memset(mgp->rx_done.entry, 0, bytes);

      status = myri10ge_load_firmware(mgp);
      if (status != 0) {
            dev_err(&pdev->dev, "failed to load firmware\n");
            goto abort_with_rx_done;
      }

      status = myri10ge_reset(mgp);
      if (status != 0) {
            dev_err(&pdev->dev, "failed reset\n");
            goto abort_with_firmware;
      }

      if (myri10ge_msi) {
            status = pci_enable_msi(pdev);
            if (status != 0)
                  dev_err(&pdev->dev,
                        "Error %d setting up MSI; falling back to xPIC\n",
                        status);
            else
                  mgp->msi_enabled = 1;
      }

      status = request_irq(pdev->irq, myri10ge_intr, IRQF_SHARED,
                       netdev->name, mgp);
      if (status != 0) {
            dev_err(&pdev->dev, "failed to allocate IRQ\n");
            goto abort_with_firmware;
      }

      pci_set_drvdata(pdev, mgp);
      if ((myri10ge_initial_mtu + ETH_HLEN) > MYRI10GE_MAX_ETHER_MTU)
            myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
      if ((myri10ge_initial_mtu + ETH_HLEN) < 68)
            myri10ge_initial_mtu = 68;
      netdev->mtu = myri10ge_initial_mtu;
      netdev->open = myri10ge_open;
      netdev->stop = myri10ge_close;
      netdev->hard_start_xmit = myri10ge_xmit;
      netdev->get_stats = myri10ge_get_stats;
      netdev->base_addr = mgp->iomem_base;
      netdev->irq = pdev->irq;
      netdev->change_mtu = myri10ge_change_mtu;
      netdev->set_multicast_list = myri10ge_set_multicast_list;
      netdev->set_mac_address = myri10ge_set_mac_address;
      netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_TSO;
      if (dac_enabled)
            netdev->features |= NETIF_F_HIGHDMA;
      netdev->poll = myri10ge_poll;
      netdev->weight = myri10ge_napi_weight;

      /* Save configuration space to be restored if the
       * nic resets due to a parity error */
      myri10ge_save_state(mgp);

      /* Setup the watchdog timer */
      setup_timer(&mgp->watchdog_timer, myri10ge_watchdog_timer,
                (unsigned long)mgp);

      SET_ETHTOOL_OPS(netdev, &myri10ge_ethtool_ops);
      INIT_WORK(&mgp->watchdog_work, myri10ge_watchdog, mgp);
      status = register_netdev(netdev);
      if (status != 0) {
            dev_err(&pdev->dev, "register_netdev failed: %d\n", status);
            goto abort_with_irq;
      }
      dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, WC %s\n",
             (mgp->msi_enabled ? "MSI" : "xPIC"),
             pdev->irq, mgp->tx.boundary, mgp->fw_name,
             (mgp->mtrr >= 0 ? "Enabled" : "Disabled"));

      return 0;

abort_with_irq:
      free_irq(pdev->irq, mgp);
      if (mgp->msi_enabled)
            pci_disable_msi(pdev);

abort_with_firmware:
      myri10ge_dummy_rdma(mgp, 0);

abort_with_rx_done:
      bytes = myri10ge_max_intr_slots * sizeof(*mgp->rx_done.entry);
      dma_free_coherent(&pdev->dev, bytes,
                    mgp->rx_done.entry, mgp->rx_done.bus);

abort_with_ioremap:
      iounmap(mgp->sram);

abort_with_wc:
#ifdef CONFIG_MTRR
      if (mgp->mtrr >= 0)
            mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
#endif
      dma_free_coherent(&pdev->dev, sizeof(*mgp->fw_stats),
                    mgp->fw_stats, mgp->fw_stats_bus);

abort_with_cmd:
      dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
                    mgp->cmd, mgp->cmd_bus);

abort_with_netdev:

      free_netdev(netdev);
      return status;
}

/*
 * myri10ge_remove
 *
 * Does what is necessary to shutdown one Myrinet device. Called
 *   once for each Myrinet card by the kernel when a module is
 *   unloaded.
 */
static void myri10ge_remove(struct pci_dev *pdev)
{
      struct myri10ge_priv *mgp;
      struct net_device *netdev;
      size_t bytes;

      mgp = pci_get_drvdata(pdev);
      if (mgp == NULL)
            return;

      flush_scheduled_work();
      netdev = mgp->dev;
      unregister_netdev(netdev);
      free_irq(pdev->irq, mgp);
      if (mgp->msi_enabled)
            pci_disable_msi(pdev);

      myri10ge_dummy_rdma(mgp, 0);

      bytes = myri10ge_max_intr_slots * sizeof(*mgp->rx_done.entry);
      dma_free_coherent(&pdev->dev, bytes,
                    mgp->rx_done.entry, mgp->rx_done.bus);

      iounmap(mgp->sram);

#ifdef CONFIG_MTRR
      if (mgp->mtrr >= 0)
            mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
#endif
      dma_free_coherent(&pdev->dev, sizeof(*mgp->fw_stats),
                    mgp->fw_stats, mgp->fw_stats_bus);

      dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
                    mgp->cmd, mgp->cmd_bus);

      free_netdev(netdev);
      pci_set_drvdata(pdev, NULL);
}

#define PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E      0x0008

static struct pci_device_id myri10ge_pci_tbl[] = {
      {PCI_DEVICE(PCI_VENDOR_ID_MYRICOM, PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E)},
      {0},
};

static struct pci_driver myri10ge_driver = {
      .name = "myri10ge",
      .probe = myri10ge_probe,
      .remove = myri10ge_remove,
      .id_table = myri10ge_pci_tbl,
#ifdef CONFIG_PM
      .suspend = myri10ge_suspend,
      .resume = myri10ge_resume,
#endif
};

static __init int myri10ge_init_module(void)
{
      printk(KERN_INFO "%s: Version %s\n", myri10ge_driver.name,
             MYRI10GE_VERSION_STR);
      return pci_register_driver(&myri10ge_driver);
}

module_init(myri10ge_init_module);

static __exit void myri10ge_cleanup_module(void)
{
      pci_unregister_driver(&myri10ge_driver);
}

module_exit(myri10ge_cleanup_module);

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