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kernel-fxtec-pro1x/drivers/net/ixgb/ixgb_main.c
Malli Chilakala ab707da7cf [PATCH] ixgb: Driver version, white space, comments 
Driver version, white space, comments & added Module_version Patch from linville

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Ganesh Venkatesan <ganesh.venkatesan@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-08-11 17:09:25 -04:00

2129 lines
56 KiB
C
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/*******************************************************************************
Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The full GNU General Public License is included in this distribution in the
file called LICENSE.
Contact Information:
Linux NICS <linux.nics@intel.com>
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*******************************************************************************/
#include "ixgb.h"
/* Change Log
* 1.0.96 04/19/05
* - Make needlessly global code static -- bunk@stusta.de
* - ethtool cleanup -- shemminger@osdl.org
* - Support for MODULE_VERSION -- linville@tuxdriver.com
* - add skb_header_cloned check to the tso path -- herbert@apana.org.au
* 1.0.88 01/05/05
* - include fix to the condition that determines when to quit NAPI - Robert Olsson
* - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
* 1.0.84 10/26/04
* - reset buffer_info->dma in Tx resource cleanup logic
* 1.0.83 10/12/04
* - sparse cleanup - shemminger@osdl.org
* - fix tx resource cleanup logic
*/
char ixgb_driver_name[] = "ixgb";
char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
#ifndef CONFIG_IXGB_NAPI
#define DRIVERNAPI
#else
#define DRIVERNAPI "-NAPI"
#endif
#define DRV_VERSION "1.0.100-k2"DRIVERNAPI
char ixgb_driver_version[] = DRV_VERSION;
static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
/* ixgb_pci_tbl - PCI Device ID Table
*
* Wildcard entries (PCI_ANY_ID) should come last
* Last entry must be all 0s
*
* { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
* Class, Class Mask, private data (not used) }
*/
static struct pci_device_id ixgb_pci_tbl[] = {
{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
/* required last entry */
{0,}
};
MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
/* Local Function Prototypes */
int ixgb_up(struct ixgb_adapter *adapter);
void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
void ixgb_reset(struct ixgb_adapter *adapter);
int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
void ixgb_update_stats(struct ixgb_adapter *adapter);
static int ixgb_init_module(void);
static void ixgb_exit_module(void);
static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void __devexit ixgb_remove(struct pci_dev *pdev);
static int ixgb_sw_init(struct ixgb_adapter *adapter);
static int ixgb_open(struct net_device *netdev);
static int ixgb_close(struct net_device *netdev);
static void ixgb_configure_tx(struct ixgb_adapter *adapter);
static void ixgb_configure_rx(struct ixgb_adapter *adapter);
static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
static void ixgb_set_multi(struct net_device *netdev);
static void ixgb_watchdog(unsigned long data);
static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
static int ixgb_set_mac(struct net_device *netdev, void *p);
static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
#ifdef CONFIG_IXGB_NAPI
static int ixgb_clean(struct net_device *netdev, int *budget);
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
int *work_done, int work_to_do);
#else
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
#endif
static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
void ixgb_set_ethtool_ops(struct net_device *netdev);
static void ixgb_tx_timeout(struct net_device *dev);
static void ixgb_tx_timeout_task(struct net_device *dev);
static void ixgb_vlan_rx_register(struct net_device *netdev,
struct vlan_group *grp);
static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
#ifdef CONFIG_NET_POLL_CONTROLLER
/* for netdump / net console */
static void ixgb_netpoll(struct net_device *dev);
#endif
/* Exported from other modules */
extern void ixgb_check_options(struct ixgb_adapter *adapter);
static struct pci_driver ixgb_driver = {
.name = ixgb_driver_name,
.id_table = ixgb_pci_tbl,
.probe = ixgb_probe,
.remove = __devexit_p(ixgb_remove),
};
MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
/* some defines for controlling descriptor fetches in h/w */
#define RXDCTL_WTHRESH_DEFAULT 16 /* chip writes back at this many or RXT0 */
#define RXDCTL_PTHRESH_DEFAULT 0 /* chip considers prefech below
* this */
#define RXDCTL_HTHRESH_DEFAULT 0 /* chip will only prefetch if tail
* is pushed this many descriptors
* from head */
/**
* ixgb_init_module - Driver Registration Routine
*
* ixgb_init_module is the first routine called when the driver is
* loaded. All it does is register with the PCI subsystem.
**/
static int __init
ixgb_init_module(void)
{
printk(KERN_INFO "%s - version %s\n",
ixgb_driver_string, ixgb_driver_version);
printk(KERN_INFO "%s\n", ixgb_copyright);
return pci_module_init(&ixgb_driver);
}
module_init(ixgb_init_module);
/**
* ixgb_exit_module - Driver Exit Cleanup Routine
*
* ixgb_exit_module is called just before the driver is removed
* from memory.
**/
static void __exit
ixgb_exit_module(void)
{
pci_unregister_driver(&ixgb_driver);
}
module_exit(ixgb_exit_module);
/**
* ixgb_irq_disable - Mask off interrupt generation on the NIC
* @adapter: board private structure
**/
static inline void
ixgb_irq_disable(struct ixgb_adapter *adapter)
{
atomic_inc(&adapter->irq_sem);
IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
IXGB_WRITE_FLUSH(&adapter->hw);
synchronize_irq(adapter->pdev->irq);
}
/**
* ixgb_irq_enable - Enable default interrupt generation settings
* @adapter: board private structure
**/
static inline void
ixgb_irq_enable(struct ixgb_adapter *adapter)
{
if(atomic_dec_and_test(&adapter->irq_sem)) {
IXGB_WRITE_REG(&adapter->hw, IMS,
IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
IXGB_INT_LSC);
IXGB_WRITE_FLUSH(&adapter->hw);
}
}
int
ixgb_up(struct ixgb_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
int err;
int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
struct ixgb_hw *hw = &adapter->hw;
/* hardware has been reset, we need to reload some things */
ixgb_set_multi(netdev);
ixgb_restore_vlan(adapter);
ixgb_configure_tx(adapter);
ixgb_setup_rctl(adapter);
ixgb_configure_rx(adapter);
ixgb_alloc_rx_buffers(adapter);
#ifdef CONFIG_PCI_MSI
{
boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
adapter->have_msi = TRUE;
if (!pcix)
adapter->have_msi = FALSE;
else if((err = pci_enable_msi(adapter->pdev))) {
printk (KERN_ERR
"Unable to allocate MSI interrupt Error: %d\n", err);
adapter->have_msi = FALSE;
/* proceed to try to request regular interrupt */
}
}
#endif
if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
SA_SHIRQ | SA_SAMPLE_RANDOM,
netdev->name, netdev)))
return err;
/* disable interrupts and get the hardware into a known state */
IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
if((hw->max_frame_size != max_frame) ||
(hw->max_frame_size !=
(IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
hw->max_frame_size = max_frame;
IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
if(hw->max_frame_size >
IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
if(!(ctrl0 & IXGB_CTRL0_JFE)) {
ctrl0 |= IXGB_CTRL0_JFE;
IXGB_WRITE_REG(hw, CTRL0, ctrl0);
}
}
}
mod_timer(&adapter->watchdog_timer, jiffies);
ixgb_irq_enable(adapter);
#ifdef CONFIG_IXGB_NAPI
netif_poll_enable(netdev);
#endif
return 0;
}
void
ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
{
struct net_device *netdev = adapter->netdev;
ixgb_irq_disable(adapter);
free_irq(adapter->pdev->irq, netdev);
#ifdef CONFIG_PCI_MSI
if(adapter->have_msi == TRUE)
pci_disable_msi(adapter->pdev);
#endif
if(kill_watchdog)
del_timer_sync(&adapter->watchdog_timer);
#ifdef CONFIG_IXGB_NAPI
netif_poll_disable(netdev);
#endif
adapter->link_speed = 0;
adapter->link_duplex = 0;
netif_carrier_off(netdev);
netif_stop_queue(netdev);
ixgb_reset(adapter);
ixgb_clean_tx_ring(adapter);
ixgb_clean_rx_ring(adapter);
}
void
ixgb_reset(struct ixgb_adapter *adapter)
{
ixgb_adapter_stop(&adapter->hw);
if(!ixgb_init_hw(&adapter->hw))
IXGB_DBG("ixgb_init_hw failed.\n");
}
/**
* ixgb_probe - Device Initialization Routine
* @pdev: PCI device information struct
* @ent: entry in ixgb_pci_tbl
*
* Returns 0 on success, negative on failure
*
* ixgb_probe initializes an adapter identified by a pci_dev structure.
* The OS initialization, configuring of the adapter private structure,
* and a hardware reset occur.
**/
static int __devinit
ixgb_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct net_device *netdev = NULL;
struct ixgb_adapter *adapter;
static int cards_found = 0;
unsigned long mmio_start;
int mmio_len;
int pci_using_dac;
int i;
int err;
if((err = pci_enable_device(pdev)))
return err;
if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
pci_using_dac = 1;
} else {
if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
IXGB_ERR("No usable DMA configuration, aborting\n");
return err;
}
pci_using_dac = 0;
}
if((err = pci_request_regions(pdev, ixgb_driver_name)))
return err;
pci_set_master(pdev);
netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
if(!netdev) {
err = -ENOMEM;
goto err_alloc_etherdev;
}
SET_MODULE_OWNER(netdev);
SET_NETDEV_DEV(netdev, &pdev->dev);
pci_set_drvdata(pdev, netdev);
adapter = netdev_priv(netdev);
adapter->netdev = netdev;
adapter->pdev = pdev;
adapter->hw.back = adapter;
mmio_start = pci_resource_start(pdev, BAR_0);
mmio_len = pci_resource_len(pdev, BAR_0);
adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
if(!adapter->hw.hw_addr) {
err = -EIO;
goto err_ioremap;
}
for(i = BAR_1; i <= BAR_5; i++) {
if(pci_resource_len(pdev, i) == 0)
continue;
if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
adapter->hw.io_base = pci_resource_start(pdev, i);
break;
}
}
netdev->open = &ixgb_open;
netdev->stop = &ixgb_close;
netdev->hard_start_xmit = &ixgb_xmit_frame;
netdev->get_stats = &ixgb_get_stats;
netdev->set_multicast_list = &ixgb_set_multi;
netdev->set_mac_address = &ixgb_set_mac;
netdev->change_mtu = &ixgb_change_mtu;
ixgb_set_ethtool_ops(netdev);
netdev->tx_timeout = &ixgb_tx_timeout;
netdev->watchdog_timeo = HZ;
#ifdef CONFIG_IXGB_NAPI
netdev->poll = &ixgb_clean;
netdev->weight = 64;
#endif
netdev->vlan_rx_register = ixgb_vlan_rx_register;
netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
#ifdef CONFIG_NET_POLL_CONTROLLER
netdev->poll_controller = ixgb_netpoll;
#endif
netdev->mem_start = mmio_start;
netdev->mem_end = mmio_start + mmio_len;
netdev->base_addr = adapter->hw.io_base;
adapter->bd_number = cards_found;
adapter->link_speed = 0;
adapter->link_duplex = 0;
/* setup the private structure */
if((err = ixgb_sw_init(adapter)))
goto err_sw_init;
netdev->features = NETIF_F_SG |
NETIF_F_HW_CSUM |
NETIF_F_HW_VLAN_TX |
NETIF_F_HW_VLAN_RX |
NETIF_F_HW_VLAN_FILTER;
#ifdef NETIF_F_TSO
netdev->features |= NETIF_F_TSO;
#endif
if(pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;
/* make sure the EEPROM is good */
if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
err = -EIO;
goto err_eeprom;
}
ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
if(!is_valid_ether_addr(netdev->dev_addr)) {
err = -EIO;
goto err_eeprom;
}
adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
init_timer(&adapter->watchdog_timer);
adapter->watchdog_timer.function = &ixgb_watchdog;
adapter->watchdog_timer.data = (unsigned long)adapter;
INIT_WORK(&adapter->tx_timeout_task,
(void (*)(void *))ixgb_tx_timeout_task, netdev);
if((err = register_netdev(netdev)))
goto err_register;
/* we're going to reset, so assume we have no link for now */
netif_carrier_off(netdev);
netif_stop_queue(netdev);
printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
netdev->name);
ixgb_check_options(adapter);
/* reset the hardware with the new settings */
ixgb_reset(adapter);
cards_found++;
return 0;
err_register:
err_sw_init:
err_eeprom:
iounmap(adapter->hw.hw_addr);
err_ioremap:
free_netdev(netdev);
err_alloc_etherdev:
pci_release_regions(pdev);
return err;
}
/**
* ixgb_remove - Device Removal Routine
* @pdev: PCI device information struct
*
* ixgb_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device. The could be caused by a
* Hot-Plug event, or because the driver is going to be removed from
* memory.
**/
static void __devexit
ixgb_remove(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct ixgb_adapter *adapter = netdev_priv(netdev);
unregister_netdev(netdev);
iounmap(adapter->hw.hw_addr);
pci_release_regions(pdev);
free_netdev(netdev);
}
/**
* ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
* @adapter: board private structure to initialize
*
* ixgb_sw_init initializes the Adapter private data structure.
* Fields are initialized based on PCI device information and
* OS network device settings (MTU size).
**/
static int __devinit
ixgb_sw_init(struct ixgb_adapter *adapter)
{
struct ixgb_hw *hw = &adapter->hw;
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
/* PCI config space info */
hw->vendor_id = pdev->vendor;
hw->device_id = pdev->device;
hw->subsystem_vendor_id = pdev->subsystem_vendor;
hw->subsystem_id = pdev->subsystem_device;
adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
if((hw->device_id == IXGB_DEVICE_ID_82597EX)
||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
hw->mac_type = ixgb_82597;
else {
/* should never have loaded on this device */
printk(KERN_ERR "ixgb: unsupported device id\n");
}
/* enable flow control to be programmed */
hw->fc.send_xon = 1;
atomic_set(&adapter->irq_sem, 1);
spin_lock_init(&adapter->tx_lock);
return 0;
}
/**
* ixgb_open - Called when a network interface is made active
* @netdev: network interface device structure
*
* Returns 0 on success, negative value on failure
*
* The open entry point is called when a network interface is made
* active by the system (IFF_UP). At this point all resources needed
* for transmit and receive operations are allocated, the interrupt
* handler is registered with the OS, the watchdog timer is started,
* and the stack is notified that the interface is ready.
**/
static int
ixgb_open(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
int err;
/* allocate transmit descriptors */
if((err = ixgb_setup_tx_resources(adapter)))
goto err_setup_tx;
/* allocate receive descriptors */
if((err = ixgb_setup_rx_resources(adapter)))
goto err_setup_rx;
if((err = ixgb_up(adapter)))
goto err_up;
return 0;
err_up:
ixgb_free_rx_resources(adapter);
err_setup_rx:
ixgb_free_tx_resources(adapter);
err_setup_tx:
ixgb_reset(adapter);
return err;
}
/**
* ixgb_close - Disables a network interface
* @netdev: network interface device structure
*
* Returns 0, this is not allowed to fail
*
* The close entry point is called when an interface is de-activated
* by the OS. The hardware is still under the drivers control, but
* needs to be disabled. A global MAC reset is issued to stop the
* hardware, and all transmit and receive resources are freed.
**/
static int
ixgb_close(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
ixgb_down(adapter, TRUE);
ixgb_free_tx_resources(adapter);
ixgb_free_rx_resources(adapter);
return 0;
}
/**
* ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
* @adapter: board private structure
*
* Return 0 on success, negative on failure
**/
int
ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *txdr = &adapter->tx_ring;
struct pci_dev *pdev = adapter->pdev;
int size;
size = sizeof(struct ixgb_buffer) * txdr->count;
txdr->buffer_info = vmalloc(size);
if(!txdr->buffer_info) {
return -ENOMEM;
}
memset(txdr->buffer_info, 0, size);
/* round up to nearest 4K */
txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
IXGB_ROUNDUP(txdr->size, 4096);
txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
if(!txdr->desc) {
vfree(txdr->buffer_info);
return -ENOMEM;
}
memset(txdr->desc, 0, txdr->size);
txdr->next_to_use = 0;
txdr->next_to_clean = 0;
return 0;
}
/**
* ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
* @adapter: board private structure
*
* Configure the Tx unit of the MAC after a reset.
**/
static void
ixgb_configure_tx(struct ixgb_adapter *adapter)
{
uint64_t tdba = adapter->tx_ring.dma;
uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
uint32_t tctl;
struct ixgb_hw *hw = &adapter->hw;
/* Setup the Base and Length of the Tx Descriptor Ring
* tx_ring.dma can be either a 32 or 64 bit value
*/
IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
IXGB_WRITE_REG(hw, TDLEN, tdlen);
/* Setup the HW Tx Head and Tail descriptor pointers */
IXGB_WRITE_REG(hw, TDH, 0);
IXGB_WRITE_REG(hw, TDT, 0);
/* don't set up txdctl, it induces performance problems if configured
* incorrectly */
/* Set the Tx Interrupt Delay register */
IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
/* Program the Transmit Control Register */
tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
IXGB_WRITE_REG(hw, TCTL, tctl);
/* Setup Transmit Descriptor Settings for this adapter */
adapter->tx_cmd_type =
IXGB_TX_DESC_TYPE
| (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
}
/**
* ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
* @adapter: board private structure
*
* Returns 0 on success, negative on failure
**/
int
ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
struct pci_dev *pdev = adapter->pdev;
int size;
size = sizeof(struct ixgb_buffer) * rxdr->count;
rxdr->buffer_info = vmalloc(size);
if(!rxdr->buffer_info) {
return -ENOMEM;
}
memset(rxdr->buffer_info, 0, size);
/* Round up to nearest 4K */
rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
IXGB_ROUNDUP(rxdr->size, 4096);
rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
if(!rxdr->desc) {
vfree(rxdr->buffer_info);
return -ENOMEM;
}
memset(rxdr->desc, 0, rxdr->size);
rxdr->next_to_clean = 0;
rxdr->next_to_use = 0;
return 0;
}
/**
* ixgb_setup_rctl - configure the receive control register
* @adapter: Board private structure
**/
static void
ixgb_setup_rctl(struct ixgb_adapter *adapter)
{
uint32_t rctl;
rctl = IXGB_READ_REG(&adapter->hw, RCTL);
rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
rctl |=
IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
(adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
rctl |= IXGB_RCTL_SECRC;
switch (adapter->rx_buffer_len) {
case IXGB_RXBUFFER_2048:
default:
rctl |= IXGB_RCTL_BSIZE_2048;
break;
case IXGB_RXBUFFER_4096:
rctl |= IXGB_RCTL_BSIZE_4096;
break;
case IXGB_RXBUFFER_8192:
rctl |= IXGB_RCTL_BSIZE_8192;
break;
case IXGB_RXBUFFER_16384:
rctl |= IXGB_RCTL_BSIZE_16384;
break;
}
IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
}
/**
* ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
* @adapter: board private structure
*
* Configure the Rx unit of the MAC after a reset.
**/
static void
ixgb_configure_rx(struct ixgb_adapter *adapter)
{
uint64_t rdba = adapter->rx_ring.dma;
uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
struct ixgb_hw *hw = &adapter->hw;
uint32_t rctl;
uint32_t rxcsum;
uint32_t rxdctl;
/* make sure receives are disabled while setting up the descriptors */
rctl = IXGB_READ_REG(hw, RCTL);
IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
/* set the Receive Delay Timer Register */
IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
/* Setup the Base and Length of the Rx Descriptor Ring */
IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
IXGB_WRITE_REG(hw, RDLEN, rdlen);
/* Setup the HW Rx Head and Tail Descriptor Pointers */
IXGB_WRITE_REG(hw, RDH, 0);
IXGB_WRITE_REG(hw, RDT, 0);
/* set up pre-fetching of receive buffers so we get some before we
* run out (default hardware behavior is to run out before fetching
* more). This sets up to fetch if HTHRESH rx descriptors are avail
* and the descriptors in hw cache are below PTHRESH. This avoids
* the hardware behavior of fetching <=512 descriptors in a single
* burst that pre-empts all other activity, usually causing fifo
* overflows. */
/* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
/* Enable Receive Checksum Offload for TCP and UDP */
if(adapter->rx_csum == TRUE) {
rxcsum = IXGB_READ_REG(hw, RXCSUM);
rxcsum |= IXGB_RXCSUM_TUOFL;
IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
}
/* Enable Receives */
IXGB_WRITE_REG(hw, RCTL, rctl);
}
/**
* ixgb_free_tx_resources - Free Tx Resources
* @adapter: board private structure
*
* Free all transmit software resources
**/
void
ixgb_free_tx_resources(struct ixgb_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
ixgb_clean_tx_ring(adapter);
vfree(adapter->tx_ring.buffer_info);
adapter->tx_ring.buffer_info = NULL;
pci_free_consistent(pdev, adapter->tx_ring.size,
adapter->tx_ring.desc, adapter->tx_ring.dma);
adapter->tx_ring.desc = NULL;
}
static inline void
ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
struct ixgb_buffer *buffer_info)
{
struct pci_dev *pdev = adapter->pdev;
if(buffer_info->dma) {
pci_unmap_page(pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_TODEVICE);
buffer_info->dma = 0;
}
if(buffer_info->skb) {
dev_kfree_skb_any(buffer_info->skb);
buffer_info->skb = NULL;
}
}
/**
* ixgb_clean_tx_ring - Free Tx Buffers
* @adapter: board private structure
**/
static void
ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
struct ixgb_buffer *buffer_info;
unsigned long size;
unsigned int i;
/* Free all the Tx ring sk_buffs */
for(i = 0; i < tx_ring->count; i++) {
buffer_info = &tx_ring->buffer_info[i];
ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
}
size = sizeof(struct ixgb_buffer) * tx_ring->count;
memset(tx_ring->buffer_info, 0, size);
/* Zero out the descriptor ring */
memset(tx_ring->desc, 0, tx_ring->size);
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
IXGB_WRITE_REG(&adapter->hw, TDH, 0);
IXGB_WRITE_REG(&adapter->hw, TDT, 0);
}
/**
* ixgb_free_rx_resources - Free Rx Resources
* @adapter: board private structure
*
* Free all receive software resources
**/
void
ixgb_free_rx_resources(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
struct pci_dev *pdev = adapter->pdev;
ixgb_clean_rx_ring(adapter);
vfree(rx_ring->buffer_info);
rx_ring->buffer_info = NULL;
pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
rx_ring->desc = NULL;
}
/**
* ixgb_clean_rx_ring - Free Rx Buffers
* @adapter: board private structure
**/
static void
ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
struct ixgb_buffer *buffer_info;
struct pci_dev *pdev = adapter->pdev;
unsigned long size;
unsigned int i;
/* Free all the Rx ring sk_buffs */
for(i = 0; i < rx_ring->count; i++) {
buffer_info = &rx_ring->buffer_info[i];
if(buffer_info->skb) {
pci_unmap_single(pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_FROMDEVICE);
dev_kfree_skb(buffer_info->skb);
buffer_info->skb = NULL;
}
}
size = sizeof(struct ixgb_buffer) * rx_ring->count;
memset(rx_ring->buffer_info, 0, size);
/* Zero out the descriptor ring */
memset(rx_ring->desc, 0, rx_ring->size);
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
IXGB_WRITE_REG(&adapter->hw, RDH, 0);
IXGB_WRITE_REG(&adapter->hw, RDT, 0);
}
/**
* ixgb_set_mac - Change the Ethernet Address of the NIC
* @netdev: network interface device structure
* @p: pointer to an address structure
*
* Returns 0 on success, negative on failure
**/
static int
ixgb_set_mac(struct net_device *netdev, void *p)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
struct sockaddr *addr = p;
if(!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
return 0;
}
/**
* ixgb_set_multi - Multicast and Promiscuous mode set
* @netdev: network interface device structure
*
* The set_multi entry point is called whenever the multicast address
* list or the network interface flags are updated. This routine is
* responsible for configuring the hardware for proper multicast,
* promiscuous mode, and all-multi behavior.
**/
static void
ixgb_set_multi(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
struct ixgb_hw *hw = &adapter->hw;
struct dev_mc_list *mc_ptr;
uint32_t rctl;
int i;
/* Check for Promiscuous and All Multicast modes */
rctl = IXGB_READ_REG(hw, RCTL);
if(netdev->flags & IFF_PROMISC) {
rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
} else if(netdev->flags & IFF_ALLMULTI) {
rctl |= IXGB_RCTL_MPE;
rctl &= ~IXGB_RCTL_UPE;
} else {
rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
}
if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
rctl |= IXGB_RCTL_MPE;
IXGB_WRITE_REG(hw, RCTL, rctl);
} else {
uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
IXGB_WRITE_REG(hw, RCTL, rctl);
for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
i++, mc_ptr = mc_ptr->next)
memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
}
}
/**
* ixgb_watchdog - Timer Call-back
* @data: pointer to netdev cast into an unsigned long
**/
static void
ixgb_watchdog(unsigned long data)
{
struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
struct net_device *netdev = adapter->netdev;
struct ixgb_desc_ring *txdr = &adapter->tx_ring;
ixgb_check_for_link(&adapter->hw);
if (ixgb_check_for_bad_link(&adapter->hw)) {
/* force the reset path */
netif_stop_queue(netdev);
}
if(adapter->hw.link_up) {
if(!netif_carrier_ok(netdev)) {
printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
netdev->name, 10000, "Full Duplex");
adapter->link_speed = 10000;
adapter->link_duplex = FULL_DUPLEX;
netif_carrier_on(netdev);
netif_wake_queue(netdev);
}
} else {
if(netif_carrier_ok(netdev)) {
adapter->link_speed = 0;
adapter->link_duplex = 0;
printk(KERN_INFO
"ixgb: %s NIC Link is Down\n",
netdev->name);
netif_carrier_off(netdev);
netif_stop_queue(netdev);
}
}
ixgb_update_stats(adapter);
if(!netif_carrier_ok(netdev)) {
if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
/* We've lost link, so the controller stops DMA,
* but we've got queued Tx work that's never going
* to get done, so reset controller to flush Tx.
* (Do the reset outside of interrupt context). */
schedule_work(&adapter->tx_timeout_task);
}
}
/* Force detection of hung controller every watchdog period */
adapter->detect_tx_hung = TRUE;
/* generate an interrupt to force clean up of any stragglers */
IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
/* Reset the timer */
mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
}
#define IXGB_TX_FLAGS_CSUM 0x00000001
#define IXGB_TX_FLAGS_VLAN 0x00000002
#define IXGB_TX_FLAGS_TSO 0x00000004
static inline int
ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
{
#ifdef NETIF_F_TSO
struct ixgb_context_desc *context_desc;
unsigned int i;
uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
uint16_t ipcse, tucse, mss;
int err;
if(likely(skb_shinfo(skb)->tso_size)) {
if (skb_header_cloned(skb)) {
err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
if (err)
return err;
}
hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
mss = skb_shinfo(skb)->tso_size;
skb->nh.iph->tot_len = 0;
skb->nh.iph->check = 0;
skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
skb->nh.iph->daddr,
0, IPPROTO_TCP, 0);
ipcss = skb->nh.raw - skb->data;
ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
ipcse = skb->h.raw - skb->data - 1;
tucss = skb->h.raw - skb->data;
tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
tucse = 0;
i = adapter->tx_ring.next_to_use;
context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
context_desc->ipcss = ipcss;
context_desc->ipcso = ipcso;
context_desc->ipcse = cpu_to_le16(ipcse);
context_desc->tucss = tucss;
context_desc->tucso = tucso;
context_desc->tucse = cpu_to_le16(tucse);
context_desc->mss = cpu_to_le16(mss);
context_desc->hdr_len = hdr_len;
context_desc->status = 0;
context_desc->cmd_type_len = cpu_to_le32(
IXGB_CONTEXT_DESC_TYPE
| IXGB_CONTEXT_DESC_CMD_TSE
| IXGB_CONTEXT_DESC_CMD_IP
| IXGB_CONTEXT_DESC_CMD_TCP
| IXGB_CONTEXT_DESC_CMD_IDE
| (skb->len - (hdr_len)));
if(++i == adapter->tx_ring.count) i = 0;
adapter->tx_ring.next_to_use = i;
return 1;
}
#endif
return 0;
}
static inline boolean_t
ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
{
struct ixgb_context_desc *context_desc;
unsigned int i;
uint8_t css, cso;
if(likely(skb->ip_summed == CHECKSUM_HW)) {
css = skb->h.raw - skb->data;
cso = (skb->h.raw + skb->csum) - skb->data;
i = adapter->tx_ring.next_to_use;
context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
context_desc->tucss = css;
context_desc->tucso = cso;
context_desc->tucse = 0;
/* zero out any previously existing data in one instruction */
*(uint32_t *)&(context_desc->ipcss) = 0;
context_desc->status = 0;
context_desc->hdr_len = 0;
context_desc->mss = 0;
context_desc->cmd_type_len =
cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
| IXGB_TX_DESC_CMD_IDE);
if(++i == adapter->tx_ring.count) i = 0;
adapter->tx_ring.next_to_use = i;
return TRUE;
}
return FALSE;
}
#define IXGB_MAX_TXD_PWR 14
#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)
static inline int
ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
unsigned int first)
{
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
struct ixgb_buffer *buffer_info;
int len = skb->len;
unsigned int offset = 0, size, count = 0, i;
unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
unsigned int f;
len -= skb->data_len;
i = tx_ring->next_to_use;
while(len) {
buffer_info = &tx_ring->buffer_info[i];
size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
buffer_info->length = size;
buffer_info->dma =
pci_map_single(adapter->pdev,
skb->data + offset,
size,
PCI_DMA_TODEVICE);
buffer_info->time_stamp = jiffies;
len -= size;
offset += size;
count++;
if(++i == tx_ring->count) i = 0;
}
for(f = 0; f < nr_frags; f++) {
struct skb_frag_struct *frag;
frag = &skb_shinfo(skb)->frags[f];
len = frag->size;
offset = 0;
while(len) {
buffer_info = &tx_ring->buffer_info[i];
size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
buffer_info->length = size;
buffer_info->dma =
pci_map_page(adapter->pdev,
frag->page,
frag->page_offset + offset,
size,
PCI_DMA_TODEVICE);
buffer_info->time_stamp = jiffies;
len -= size;
offset += size;
count++;
if(++i == tx_ring->count) i = 0;
}
}
i = (i == 0) ? tx_ring->count - 1 : i - 1;
tx_ring->buffer_info[i].skb = skb;
tx_ring->buffer_info[first].next_to_watch = i;
return count;
}
static inline void
ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
{
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
struct ixgb_tx_desc *tx_desc = NULL;
struct ixgb_buffer *buffer_info;
uint32_t cmd_type_len = adapter->tx_cmd_type;
uint8_t status = 0;
uint8_t popts = 0;
unsigned int i;
if(tx_flags & IXGB_TX_FLAGS_TSO) {
cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
}
if(tx_flags & IXGB_TX_FLAGS_CSUM)
popts |= IXGB_TX_DESC_POPTS_TXSM;
if(tx_flags & IXGB_TX_FLAGS_VLAN) {
cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
}
i = tx_ring->next_to_use;
while(count--) {
buffer_info = &tx_ring->buffer_info[i];
tx_desc = IXGB_TX_DESC(*tx_ring, i);
tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
tx_desc->cmd_type_len =
cpu_to_le32(cmd_type_len | buffer_info->length);
tx_desc->status = status;
tx_desc->popts = popts;
tx_desc->vlan = cpu_to_le16(vlan_id);
if(++i == tx_ring->count) i = 0;
}
tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
| IXGB_TX_DESC_CMD_RS );
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64). */
wmb();
tx_ring->next_to_use = i;
IXGB_WRITE_REG(&adapter->hw, TDT, i);
}
/* Tx Descriptors needed, worst case */
#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
(((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
static int
ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
unsigned int first;
unsigned int tx_flags = 0;
unsigned long flags;
int vlan_id = 0;
int tso;
if(skb->len <= 0) {
dev_kfree_skb_any(skb);
return 0;
}
spin_lock_irqsave(&adapter->tx_lock, flags);
if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
netif_stop_queue(netdev);
spin_unlock_irqrestore(&adapter->tx_lock, flags);
return 1;
}
spin_unlock_irqrestore(&adapter->tx_lock, flags);
if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
tx_flags |= IXGB_TX_FLAGS_VLAN;
vlan_id = vlan_tx_tag_get(skb);
}
first = adapter->tx_ring.next_to_use;
tso = ixgb_tso(adapter, skb);
if (tso < 0) {
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
if (tso)
tx_flags |= IXGB_TX_FLAGS_TSO;
else if(ixgb_tx_csum(adapter, skb))
tx_flags |= IXGB_TX_FLAGS_CSUM;
ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
tx_flags);
netdev->trans_start = jiffies;
return 0;
}
/**
* ixgb_tx_timeout - Respond to a Tx Hang
* @netdev: network interface device structure
**/
static void
ixgb_tx_timeout(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
/* Do the reset outside of interrupt context */
schedule_work(&adapter->tx_timeout_task);
}
static void
ixgb_tx_timeout_task(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
ixgb_down(adapter, TRUE);
ixgb_up(adapter);
}
/**
* ixgb_get_stats - Get System Network Statistics
* @netdev: network interface device structure
*
* Returns the address of the device statistics structure.
* The statistics are actually updated from the timer callback.
**/
static struct net_device_stats *
ixgb_get_stats(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
return &adapter->net_stats;
}
/**
* ixgb_change_mtu - Change the Maximum Transfer Unit
* @netdev: network interface device structure
* @new_mtu: new value for maximum frame size
*
* Returns 0 on success, negative on failure
**/
static int
ixgb_change_mtu(struct net_device *netdev, int new_mtu)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
|| (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
IXGB_ERR("Invalid MTU setting\n");
return -EINVAL;
}
if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
|| (max_frame <= IXGB_RXBUFFER_2048)) {
adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
} else if(max_frame <= IXGB_RXBUFFER_4096) {
adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
} else if(max_frame <= IXGB_RXBUFFER_8192) {
adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
} else {
adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
}
netdev->mtu = new_mtu;
if(old_max_frame != max_frame && netif_running(netdev)) {
ixgb_down(adapter, TRUE);
ixgb_up(adapter);
}
return 0;
}
/**
* ixgb_update_stats - Update the board statistics counters.
* @adapter: board private structure
**/
void
ixgb_update_stats(struct ixgb_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
u64 bcast = ((u64)bcast_h << 32) | bcast_l;
multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
/* fix up multicast stats by removing broadcasts */
if(multi >= bcast)
multi -= bcast;
adapter->stats.mprcl += (multi & 0xFFFFFFFF);
adapter->stats.mprch += (multi >> 32);
adapter->stats.bprcl += bcast_l;
adapter->stats.bprch += bcast_h;
} else {
adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
}
adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
/* Fill out the OS statistics structure */
adapter->net_stats.rx_packets = adapter->stats.gprcl;
adapter->net_stats.tx_packets = adapter->stats.gptcl;
adapter->net_stats.rx_bytes = adapter->stats.gorcl;
adapter->net_stats.tx_bytes = adapter->stats.gotcl;
adapter->net_stats.multicast = adapter->stats.mprcl;
adapter->net_stats.collisions = 0;
/* ignore RLEC as it reports errors for padded (<64bytes) frames
* with a length in the type/len field */
adapter->net_stats.rx_errors =
/* adapter->stats.rnbc + */ adapter->stats.crcerrs +
adapter->stats.ruc +
adapter->stats.roc /*+ adapter->stats.rlec */ +
adapter->stats.icbc +
adapter->stats.ecbc + adapter->stats.mpc;
adapter->net_stats.rx_dropped = adapter->stats.mpc;
/* see above
* adapter->net_stats.rx_length_errors = adapter->stats.rlec;
*/
adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
adapter->net_stats.rx_over_errors = adapter->stats.mpc;
adapter->net_stats.tx_errors = 0;
adapter->net_stats.rx_frame_errors = 0;
adapter->net_stats.tx_aborted_errors = 0;
adapter->net_stats.tx_carrier_errors = 0;
adapter->net_stats.tx_fifo_errors = 0;
adapter->net_stats.tx_heartbeat_errors = 0;
adapter->net_stats.tx_window_errors = 0;
}
#define IXGB_MAX_INTR 10
/**
* ixgb_intr - Interrupt Handler
* @irq: interrupt number
* @data: pointer to a network interface device structure
* @pt_regs: CPU registers structure
**/
static irqreturn_t
ixgb_intr(int irq, void *data, struct pt_regs *regs)
{
struct net_device *netdev = data;
struct ixgb_adapter *adapter = netdev_priv(netdev);
struct ixgb_hw *hw = &adapter->hw;
uint32_t icr = IXGB_READ_REG(hw, ICR);
#ifndef CONFIG_IXGB_NAPI
unsigned int i;
#endif
if(unlikely(!icr))
return IRQ_NONE; /* Not our interrupt */
if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
mod_timer(&adapter->watchdog_timer, jiffies);
}
#ifdef CONFIG_IXGB_NAPI
if(netif_rx_schedule_prep(netdev)) {
/* Disable interrupts and register for poll. The flush
of the posted write is intentionally left out.
*/
atomic_inc(&adapter->irq_sem);
IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
__netif_rx_schedule(netdev);
}
#else
/* yes, that is actually a & and it is meant to make sure that
* every pass through this for loop checks both receive and
* transmit queues for completed descriptors, intended to
* avoid starvation issues and assist tx/rx fairness. */
for(i = 0; i < IXGB_MAX_INTR; i++)
if(!ixgb_clean_rx_irq(adapter) &
!ixgb_clean_tx_irq(adapter))
break;
#endif
return IRQ_HANDLED;
}
#ifdef CONFIG_IXGB_NAPI
/**
* ixgb_clean - NAPI Rx polling callback
* @adapter: board private structure
**/
static int
ixgb_clean(struct net_device *netdev, int *budget)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
int work_to_do = min(*budget, netdev->quota);
int tx_cleaned;
int work_done = 0;
tx_cleaned = ixgb_clean_tx_irq(adapter);
ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
*budget -= work_done;
netdev->quota -= work_done;
/* if no Tx and not enough Rx work done, exit the polling mode */
if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
netif_rx_complete(netdev);
ixgb_irq_enable(adapter);
return 0;
}
return 1;
}
#endif
/**
* ixgb_clean_tx_irq - Reclaim resources after transmit completes
* @adapter: board private structure
**/
static boolean_t
ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
struct net_device *netdev = adapter->netdev;
struct ixgb_tx_desc *tx_desc, *eop_desc;
struct ixgb_buffer *buffer_info;
unsigned int i, eop;
boolean_t cleaned = FALSE;
i = tx_ring->next_to_clean;
eop = tx_ring->buffer_info[i].next_to_watch;
eop_desc = IXGB_TX_DESC(*tx_ring, eop);
while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
for(cleaned = FALSE; !cleaned; ) {
tx_desc = IXGB_TX_DESC(*tx_ring, i);
buffer_info = &tx_ring->buffer_info[i];
if (tx_desc->popts
& (IXGB_TX_DESC_POPTS_TXSM |
IXGB_TX_DESC_POPTS_IXSM))
adapter->hw_csum_tx_good++;
ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
*(uint32_t *)&(tx_desc->status) = 0;
cleaned = (i == eop);
if(++i == tx_ring->count) i = 0;
}
eop = tx_ring->buffer_info[i].next_to_watch;
eop_desc = IXGB_TX_DESC(*tx_ring, eop);
}
tx_ring->next_to_clean = i;
spin_lock(&adapter->tx_lock);
if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
(IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
netif_wake_queue(netdev);
}
spin_unlock(&adapter->tx_lock);
if(adapter->detect_tx_hung) {
/* detect a transmit hang in hardware, this serializes the
* check with the clearing of time_stamp and movement of i */
adapter->detect_tx_hung = FALSE;
if(tx_ring->buffer_info[i].dma &&
time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
&& !(IXGB_READ_REG(&adapter->hw, STATUS) &
IXGB_STATUS_TXOFF))
netif_stop_queue(netdev);
}
return cleaned;
}
/**
* ixgb_rx_checksum - Receive Checksum Offload for 82597.
* @adapter: board private structure
* @rx_desc: receive descriptor
* @sk_buff: socket buffer with received data
**/
static inline void
ixgb_rx_checksum(struct ixgb_adapter *adapter,
struct ixgb_rx_desc *rx_desc,
struct sk_buff *skb)
{
/* Ignore Checksum bit is set OR
* TCP Checksum has not been calculated
*/
if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
(!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
skb->ip_summed = CHECKSUM_NONE;
return;
}
/* At this point we know the hardware did the TCP checksum */
/* now look at the TCP checksum error bit */
if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
/* let the stack verify checksum errors */
skb->ip_summed = CHECKSUM_NONE;
adapter->hw_csum_rx_error++;
} else {
/* TCP checksum is good */
skb->ip_summed = CHECKSUM_UNNECESSARY;
adapter->hw_csum_rx_good++;
}
}
/**
* ixgb_clean_rx_irq - Send received data up the network stack,
* @adapter: board private structure
**/
static boolean_t
#ifdef CONFIG_IXGB_NAPI
ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
#else
ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
#endif
{
struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
struct ixgb_rx_desc *rx_desc, *next_rxd;
struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
uint32_t length;
unsigned int i, j;
boolean_t cleaned = FALSE;
i = rx_ring->next_to_clean;
rx_desc = IXGB_RX_DESC(*rx_ring, i);
buffer_info = &rx_ring->buffer_info[i];
while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
struct sk_buff *skb, *next_skb;
u8 status;
#ifdef CONFIG_IXGB_NAPI
if(*work_done >= work_to_do)
break;
(*work_done)++;
#endif
status = rx_desc->status;
skb = buffer_info->skb;
prefetch(skb->data);
if(++i == rx_ring->count) i = 0;
next_rxd = IXGB_RX_DESC(*rx_ring, i);
prefetch(next_rxd);
if((j = i + 1) == rx_ring->count) j = 0;
next2_buffer = &rx_ring->buffer_info[j];
prefetch(next2_buffer);
next_buffer = &rx_ring->buffer_info[i];
next_skb = next_buffer->skb;
prefetch(next_skb);
cleaned = TRUE;
pci_unmap_single(pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_FROMDEVICE);
length = le16_to_cpu(rx_desc->length);
if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
/* All receives must fit into a single buffer */
IXGB_DBG("Receive packet consumed multiple buffers "
"length<%x>\n", length);
dev_kfree_skb_irq(skb);
goto rxdesc_done;
}
if (unlikely(rx_desc->errors
& (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
| IXGB_RX_DESC_ERRORS_P |
IXGB_RX_DESC_ERRORS_RXE))) {
dev_kfree_skb_irq(skb);
goto rxdesc_done;
}
/* Good Receive */
skb_put(skb, length);
/* Receive Checksum Offload */
ixgb_rx_checksum(adapter, rx_desc, skb);
skb->protocol = eth_type_trans(skb, netdev);
#ifdef CONFIG_IXGB_NAPI
if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
le16_to_cpu(rx_desc->special) &
IXGB_RX_DESC_SPECIAL_VLAN_MASK);
} else {
netif_receive_skb(skb);
}
#else /* CONFIG_IXGB_NAPI */
if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
vlan_hwaccel_rx(skb, adapter->vlgrp,
le16_to_cpu(rx_desc->special) &
IXGB_RX_DESC_SPECIAL_VLAN_MASK);
} else {
netif_rx(skb);
}
#endif /* CONFIG_IXGB_NAPI */
netdev->last_rx = jiffies;
rxdesc_done:
/* clean up descriptor, might be written over by hw */
rx_desc->status = 0;
buffer_info->skb = NULL;
/* use prefetched values */
rx_desc = next_rxd;
buffer_info = next_buffer;
}
rx_ring->next_to_clean = i;
ixgb_alloc_rx_buffers(adapter);
return cleaned;
}
/**
* ixgb_alloc_rx_buffers - Replace used receive buffers
* @adapter: address of board private structure
**/
static void
ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
struct ixgb_rx_desc *rx_desc;
struct ixgb_buffer *buffer_info;
struct sk_buff *skb;
unsigned int i;
int num_group_tail_writes;
long cleancount;
i = rx_ring->next_to_use;
buffer_info = &rx_ring->buffer_info[i];
cleancount = IXGB_DESC_UNUSED(rx_ring);
num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
/* leave three descriptors unused */
while(--cleancount > 2) {
rx_desc = IXGB_RX_DESC(*rx_ring, i);
skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
if(unlikely(!skb)) {
/* Better luck next round */
break;
}
/* Make buffer alignment 2 beyond a 16 byte boundary
* this will result in a 16 byte aligned IP header after
* the 14 byte MAC header is removed
*/
skb_reserve(skb, NET_IP_ALIGN);
skb->dev = netdev;
buffer_info->skb = skb;
buffer_info->length = adapter->rx_buffer_len;
buffer_info->dma =
pci_map_single(pdev,
skb->data,
adapter->rx_buffer_len,
PCI_DMA_FROMDEVICE);
rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
/* guarantee DD bit not set now before h/w gets descriptor
* this is the rest of the workaround for h/w double
* writeback. */
rx_desc->status = 0;
if((i & ~(num_group_tail_writes- 1)) == i) {
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64). */
wmb();
IXGB_WRITE_REG(&adapter->hw, RDT, i);
}
if(++i == rx_ring->count) i = 0;
buffer_info = &rx_ring->buffer_info[i];
}
rx_ring->next_to_use = i;
}
/**
* ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
*
* @param netdev network interface device structure
* @param grp indicates to enable or disable tagging/stripping
**/
static void
ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
uint32_t ctrl, rctl;
ixgb_irq_disable(adapter);
adapter->vlgrp = grp;
if(grp) {
/* enable VLAN tag insert/strip */
ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
ctrl |= IXGB_CTRL0_VME;
IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
/* enable VLAN receive filtering */
rctl = IXGB_READ_REG(&adapter->hw, RCTL);
rctl |= IXGB_RCTL_VFE;
rctl &= ~IXGB_RCTL_CFIEN;
IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
} else {
/* disable VLAN tag insert/strip */
ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
ctrl &= ~IXGB_CTRL0_VME;
IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
/* disable VLAN filtering */
rctl = IXGB_READ_REG(&adapter->hw, RCTL);
rctl &= ~IXGB_RCTL_VFE;
IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
}
ixgb_irq_enable(adapter);
}
static void
ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
uint32_t vfta, index;
/* add VID to filter table */
index = (vid >> 5) & 0x7F;
vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
vfta |= (1 << (vid & 0x1F));
ixgb_write_vfta(&adapter->hw, index, vfta);
}
static void
ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
uint32_t vfta, index;
ixgb_irq_disable(adapter);
if(adapter->vlgrp)
adapter->vlgrp->vlan_devices[vid] = NULL;
ixgb_irq_enable(adapter);
/* remove VID from filter table*/
index = (vid >> 5) & 0x7F;
vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
vfta &= ~(1 << (vid & 0x1F));
ixgb_write_vfta(&adapter->hw, index, vfta);
}
static void
ixgb_restore_vlan(struct ixgb_adapter *adapter)
{
ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
if(adapter->vlgrp) {
uint16_t vid;
for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
if(!adapter->vlgrp->vlan_devices[vid])
continue;
ixgb_vlan_rx_add_vid(adapter->netdev, vid);
}
}
}
#ifdef CONFIG_NET_POLL_CONTROLLER
/*
* Polling 'interrupt' - used by things like netconsole to send skbs
* without having to re-enable interrupts. It's not called while
* the interrupt routine is executing.
*/
static void ixgb_netpoll(struct net_device *dev)
{
struct ixgb_adapter *adapter = dev->priv;
disable_irq(adapter->pdev->irq);
ixgb_intr(adapter->pdev->irq, dev, NULL);
enable_irq(adapter->pdev->irq);
}
#endif
/* ixgb_main.c */
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