// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Intel Corporation */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/if_vlan.h>
#include <linux/aer.h>
#include "igc.h"
#include "igc_hw.h"
#define DRV_VERSION "0.0.1-k"
#define DRV_SUMMARY "Intel(R) 2.5G Ethernet Linux Driver"
static int debug = -1;
MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION(DRV_SUMMARY);
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRV_VERSION);
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
char igc_driver_name[] = "igc";
char igc_driver_version[] = DRV_VERSION;
static const char igc_driver_string[] = DRV_SUMMARY;
static const char igc_copyright[] =
"Copyright(c) 2018 Intel Corporation.";
static const struct igc_info *igc_info_tbl[] = {
[board_base] = &igc_base_info,
};
static const struct pci_device_id igc_pci_tbl[] = {
{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_LM), board_base },
{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_V), board_base },
/* required last entry */
{0, }
};
MODULE_DEVICE_TABLE(pci, igc_pci_tbl);
/* forward declaration */
static void igc_clean_tx_ring(struct igc_ring *tx_ring);
static int igc_sw_init(struct igc_adapter *);
static void igc_configure(struct igc_adapter *adapter);
static void igc_power_down_link(struct igc_adapter *adapter);
static void igc_set_default_mac_filter(struct igc_adapter *adapter);
static void igc_set_rx_mode(struct net_device *netdev);
static void igc_write_itr(struct igc_q_vector *q_vector);
static void igc_assign_vector(struct igc_q_vector *q_vector, int msix_vector);
static void igc_free_q_vector(struct igc_adapter *adapter, int v_idx);
static void igc_set_interrupt_capability(struct igc_adapter *adapter,
bool msix);
static void igc_free_q_vectors(struct igc_adapter *adapter);
static void igc_irq_disable(struct igc_adapter *adapter);
static void igc_irq_enable(struct igc_adapter *adapter);
static void igc_configure_msix(struct igc_adapter *adapter);
static bool igc_alloc_mapped_page(struct igc_ring *rx_ring,
struct igc_rx_buffer *bi);
enum latency_range {
lowest_latency = 0,
low_latency = 1,
bulk_latency = 2,
latency_invalid = 255
};
static void igc_reset(struct igc_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
struct igc_hw *hw = &adapter->hw;
hw->mac.ops.reset_hw(hw);
if (hw->mac.ops.init_hw(hw))
dev_err(&pdev->dev, "Hardware Error\n");
if (!netif_running(adapter->netdev))
igc_power_down_link(adapter);
igc_get_phy_info(hw);
}
/**
* igc_power_up_link - Power up the phy/serdes link
* @adapter: address of board private structure
*/
static void igc_power_up_link(struct igc_adapter *adapter)
{
igc_reset_phy(&adapter->hw);
if (adapter->hw.phy.media_type == igc_media_type_copper)
igc_power_up_phy_copper(&adapter->hw);
igc_setup_link(&adapter->hw);
}
/**
* igc_power_down_link - Power down the phy/serdes link
* @adapter: address of board private structure
*/
static void igc_power_down_link(struct igc_adapter *adapter)
{
if (adapter->hw.phy.media_type == igc_media_type_copper)
igc_power_down_phy_copper_base(&adapter->hw);
}
/**
* igc_release_hw_control - release control of the h/w to f/w
* @adapter: address of board private structure
*
* igc_release_hw_control resets CTRL_EXT:DRV_LOAD bit.
* For ASF and Pass Through versions of f/w this means that the
* driver is no longer loaded.
*/
static void igc_release_hw_control(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
u32 ctrl_ext;
/* Let firmware take over control of h/w */
ctrl_ext = rd32(IGC_CTRL_EXT);
wr32(IGC_CTRL_EXT,
ctrl_ext & ~IGC_CTRL_EXT_DRV_LOAD);
}
/**
* igc_get_hw_control - get control of the h/w from f/w
* @adapter: address of board private structure
*
* igc_get_hw_control sets CTRL_EXT:DRV_LOAD bit.
* For ASF and Pass Through versions of f/w this means that
* the driver is loaded.
*/
static void igc_get_hw_control(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
u32 ctrl_ext;
/* Let firmware know the driver has taken over */
ctrl_ext = rd32(IGC_CTRL_EXT);
wr32(IGC_CTRL_EXT,
ctrl_ext | IGC_CTRL_EXT_DRV_LOAD);
}
/**
* igc_free_tx_resources - Free Tx Resources per Queue
* @tx_ring: Tx descriptor ring for a specific queue
*
* Free all transmit software resources
*/
static void igc_free_tx_resources(struct igc_ring *tx_ring)
{
igc_clean_tx_ring(tx_ring);
vfree(tx_ring->tx_buffer_info);
tx_ring->tx_buffer_info = NULL;
/* if not set, then don't free */
if (!tx_ring->desc)
return;
dma_free_coherent(tx_ring->dev, tx_ring->size,
tx_ring->desc, tx_ring->dma);
tx_ring->desc = NULL;
}
/**
* igc_free_all_tx_resources - Free Tx Resources for All Queues
* @adapter: board private structure
*
* Free all transmit software resources
*/
static void igc_free_all_tx_resources(struct igc_adapter *adapter)
{
int i;
for (i = 0; i < adapter->num_tx_queues; i++)
igc_free_tx_resources(adapter->tx_ring[i]);
}
/**
* igc_clean_tx_ring - Free Tx Buffers
* @tx_ring: ring to be cleaned
*/
static void igc_clean_tx_ring(struct igc_ring *tx_ring)
{
u16 i = tx_ring->next_to_clean;
struct igc_tx_buffer *tx_buffer = &tx_ring->tx_buffer_info[i];
while (i != tx_ring->next_to_use) {
union igc_adv_tx_desc *eop_desc, *tx_desc;
/* Free all the Tx ring sk_buffs */
dev_kfree_skb_any(tx_buffer->skb);
/* unmap skb header data */
dma_unmap_single(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
/* check for eop_desc to determine the end of the packet */
eop_desc = tx_buffer->next_to_watch;
tx_desc = IGC_TX_DESC(tx_ring, i);
/* unmap remaining buffers */
while (tx_desc != eop_desc) {
tx_buffer++;
tx_desc++;
i++;
if (unlikely(i == tx_ring->count)) {
i = 0;
tx_buffer = tx_ring->tx_buffer_info;
tx_desc = IGC_TX_DESC(tx_ring, 0);
}
/* unmap any remaining paged data */
if (dma_unmap_len(tx_buffer, len))
dma_unmap_page(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
}
/* move us one more past the eop_desc for start of next pkt */
tx_buffer++;
i++;
if (unlikely(i == tx_ring->count)) {
i = 0;
tx_buffer = tx_ring->tx_buffer_info;
}
}
/* reset BQL for queue */
netdev_tx_reset_queue(txring_txq(tx_ring));
/* reset next_to_use and next_to_clean */
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
}
/**
* igc_clean_all_tx_rings - Free Tx Buffers for all queues
* @adapter: board private structure
*/
static void igc_clean_all_tx_rings(struct igc_adapter *adapter)
{
int i;
for (i = 0; i < adapter->num_tx_queues; i++)
if (adapter->tx_ring[i])
igc_clean_tx_ring(adapter->tx_ring[i]);
}
/**
* igc_setup_tx_resources - allocate Tx resources (Descriptors)
* @tx_ring: tx descriptor ring (for a specific queue) to setup
*
* Return 0 on success, negative on failure
*/
static int igc_setup_tx_resources(struct igc_ring *tx_ring)
{
struct device *dev = tx_ring->dev;
int size = 0;
size = sizeof(struct igc_tx_buffer) * tx_ring->count;
tx_ring->tx_buffer_info = vzalloc(size);
if (!tx_ring->tx_buffer_info)
goto err;
/* round up to nearest 4K */
tx_ring->size = tx_ring->count * sizeof(union igc_adv_tx_desc);
tx_ring->size = ALIGN(tx_ring->size, 4096);
tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
&tx_ring->dma, GFP_KERNEL);
if (!tx_ring->desc)
goto err;
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
return 0;
err:
vfree(tx_ring->tx_buffer_info);
dev_err(dev,
"Unable to allocate memory for the transmit descriptor ring\n");
return -ENOMEM;
}
/**
* igc_setup_all_tx_resources - wrapper to allocate Tx resources for all queues
* @adapter: board private structure
*
* Return 0 on success, negative on failure
*/
static int igc_setup_all_tx_resources(struct igc_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
int i, err = 0;
for (i = 0; i < adapter->num_tx_queues; i++) {
err = igc_setup_tx_resources(adapter->tx_ring[i]);
if (err) {
dev_err(&pdev->dev,
"Allocation for Tx Queue %u failed\n", i);
for (i--; i >= 0; i--)
igc_free_tx_resources(adapter->tx_ring[i]);
break;
}
}
return err;
}
/**
* igc_clean_rx_ring - Free Rx Buffers per Queue
* @rx_ring: ring to free buffers from
*/
static void igc_clean_rx_ring(struct igc_ring *rx_ring)
{
u16 i = rx_ring->next_to_clean;
if (rx_ring->skb)
dev_kfree_skb(rx_ring->skb);
rx_ring->skb = NULL;
/* Free all the Rx ring sk_buffs */
while (i != rx_ring->next_to_alloc) {
struct igc_rx_buffer *buffer_info = &rx_ring->rx_buffer_info[i];
/* Invalidate cache lines that may have been written to by
* device so that we avoid corrupting memory.
*/
dma_sync_single_range_for_cpu(rx_ring->dev,
buffer_info->dma,
buffer_info->page_offset,
igc_rx_bufsz(rx_ring),
DMA_FROM_DEVICE);
/* free resources associated with mapping */
dma_unmap_page_attrs(rx_ring->dev,
buffer_info->dma,
igc_rx_pg_size(rx_ring),
DMA_FROM_DEVICE,
IGC_RX_DMA_ATTR);
__page_frag_cache_drain(buffer_info->page,
buffer_info->pagecnt_bias);
i++;
if (i == rx_ring->count)
i = 0;
}
rx_ring->next_to_alloc = 0;
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
}
/**
* igc_clean_all_rx_rings - Free Rx Buffers for all queues
* @adapter: board private structure
*/
static void igc_clean_all_rx_rings(struct igc_adapter *adapter)
{
int i;
for (i = 0; i < adapter->num_rx_queues; i++)
if (adapter->rx_ring[i])
igc_clean_rx_ring(adapter->rx_ring[i]);
}
/**
* igc_free_rx_resources - Free Rx Resources
* @rx_ring: ring to clean the resources from
*
* Free all receive software resources
*/
static void igc_free_rx_resources(struct igc_ring *rx_ring)
{
igc_clean_rx_ring(rx_ring);
vfree(rx_ring->rx_buffer_info);
rx_ring->rx_buffer_info = NULL;
/* if not set, then don't free */
if (!rx_ring->desc)
return;
dma_free_coherent(rx_ring->dev, rx_ring->size,
rx_ring->desc, rx_ring->dma);
rx_ring->desc = NULL;
}
/**
* igc_free_all_rx_resources - Free Rx Resources for All Queues
* @adapter: board private structure
*
* Free all receive software resources
*/
static void igc_free_all_rx_resources(struct igc_adapter *adapter)
{
int i;
for (i = 0; i < adapter->num_rx_queues; i++)
igc_free_rx_resources(adapter->rx_ring[i]);
}
/**
* igc_setup_rx_resources - allocate Rx resources (Descriptors)
* @rx_ring: rx descriptor ring (for a specific queue) to setup
*
* Returns 0 on success, negative on failure
*/
static int igc_setup_rx_resources(struct igc_ring *rx_ring)
{
struct device *dev = rx_ring->dev;
int size, desc_len;
size = sizeof(struct igc_rx_buffer) * rx_ring->count;
rx_ring->rx_buffer_info = vzalloc(size);
if (!rx_ring->rx_buffer_info)
goto err;
desc_len = sizeof(union igc_adv_rx_desc);
/* Round up to nearest 4K */
rx_ring->size = rx_ring->count * desc_len;
rx_ring->size = ALIGN(rx_ring->size, 4096);
rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
&rx_ring->dma, GFP_KERNEL);
if (!rx_ring->desc)
goto err;
rx_ring->next_to_alloc = 0;
rx_ring->next_to_clean = 0;
rx_ring->next_to_use = 0;
return 0;
err:
vfree(rx_ring->rx_buffer_info);
rx_ring->rx_buffer_info = NULL;
dev_err(dev,
"Unable to allocate memory for the receive descriptor ring\n");
return -ENOMEM;
}
/**
* igc_setup_all_rx_resources - wrapper to allocate Rx resources
* (Descriptors) for all queues
* @adapter: board private structure
*
* Return 0 on success, negative on failure
*/
static int igc_setup_all_rx_resources(struct igc_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
int i, err = 0;
for (i = 0; i < adapter->num_rx_queues; i++) {
err = igc_setup_rx_resources(adapter->rx_ring[i]);
if (err) {
dev_err(&pdev->dev,
"Allocation for Rx Queue %u failed\n", i);
for (i--; i >= 0; i--)
igc_free_rx_resources(adapter->rx_ring[i]);
break;
}
}
return err;
}
/**
* igc_configure_rx_ring - Configure a receive ring after Reset
* @adapter: board private structure
* @ring: receive ring to be configured
*
* Configure the Rx unit of the MAC after a reset.
*/
static void igc_configure_rx_ring(struct igc_adapter *adapter,
struct igc_ring *ring)
{
struct igc_hw *hw = &adapter->hw;
union igc_adv_rx_desc *rx_desc;
int reg_idx = ring->reg_idx;
u32 srrctl = 0, rxdctl = 0;
u64 rdba = ring->dma;
/* disable the queue */
wr32(IGC_RXDCTL(reg_idx), 0);
/* Set DMA base address registers */
wr32(IGC_RDBAL(reg_idx),
rdba & 0x00000000ffffffffULL);
wr32(IGC_RDBAH(reg_idx), rdba >> 32);
wr32(IGC_RDLEN(reg_idx),
ring->count * sizeof(union igc_adv_rx_desc));
/* initialize head and tail */
ring->tail = adapter->io_addr + IGC_RDT(reg_idx);
wr32(IGC_RDH(reg_idx), 0);
writel(0, ring->tail);
/* reset next-to- use/clean to place SW in sync with hardware */
ring->next_to_clean = 0;
ring->next_to_use = 0;
/* set descriptor configuration */
srrctl = IGC_RX_HDR_LEN << IGC_SRRCTL_BSIZEHDRSIZE_SHIFT;
if (ring_uses_large_buffer(ring))
srrctl |= IGC_RXBUFFER_3072 >> IGC_SRRCTL_BSIZEPKT_SHIFT;
else
srrctl |= IGC_RXBUFFER_2048 >> IGC_SRRCTL_BSIZEPKT_SHIFT;
srrctl |= IGC_SRRCTL_DESCTYPE_ADV_ONEBUF;
wr32(IGC_SRRCTL(reg_idx), srrctl);
rxdctl |= IGC_RX_PTHRESH;
rxdctl |= IGC_RX_HTHRESH << 8;
rxdctl |= IGC_RX_WTHRESH << 16;
/* initialize rx_buffer_info */
memset(ring->rx_buffer_info, 0,
sizeof(struct igc_rx_buffer) * ring->count);
/* initialize Rx descriptor 0 */
rx_desc = IGC_RX_DESC(ring, 0);
rx_desc->wb.upper.length = 0;
/* enable receive descriptor fetching */
rxdctl |= IGC_RXDCTL_QUEUE_ENABLE;
wr32(IGC_RXDCTL(reg_idx), rxdctl);
}
/**
* igc_configure_rx - Configure receive Unit after Reset
* @adapter: board private structure
*
* Configure the Rx unit of the MAC after a reset.
*/
static void igc_configure_rx(struct igc_adapter *adapter)
{
int i;
/* Setup the HW Rx Head and Tail Descriptor Pointers and
* the Base and Length of the Rx Descriptor Ring
*/
for (i = 0; i < adapter->num_rx_queues; i++)
igc_configure_rx_ring(adapter, adapter->rx_ring[i]);
}
/**
* igc_configure_tx_ring - Configure transmit ring after Reset
* @adapter: board private structure
* @ring: tx ring to configure
*
* Configure a transmit ring after a reset.
*/
static void igc_configure_tx_ring(struct igc_adapter *adapter,
struct igc_ring *ring)
{
struct igc_hw *hw = &adapter->hw;
int reg_idx = ring->reg_idx;
u64 tdba = ring->dma;
u32 txdctl = 0;
/* disable the queue */
wr32(IGC_TXDCTL(reg_idx), 0);
wrfl();
mdelay(10);
wr32(IGC_TDLEN(reg_idx),
ring->count * sizeof(union igc_adv_tx_desc));
wr32(IGC_TDBAL(reg_idx),
tdba & 0x00000000ffffffffULL);
wr32(IGC_TDBAH(reg_idx), tdba >> 32);
ring->tail = adapter->io_addr + IGC_TDT(reg_idx);
wr32(IGC_TDH(reg_idx), 0);
writel(0, ring->tail);
txdctl |= IGC_TX_PTHRESH;
txdctl |= IGC_TX_HTHRESH << 8;
txdctl |= IGC_TX_WTHRESH << 16;
txdctl |= IGC_TXDCTL_QUEUE_ENABLE;
wr32(IGC_TXDCTL(reg_idx), txdctl);
}
/**
* igc_configure_tx - Configure transmit Unit after Reset
* @adapter: board private structure
*
* Configure the Tx unit of the MAC after a reset.
*/
static void igc_configure_tx(struct igc_adapter *adapter)
{
int i;
for (i = 0; i < adapter->num_tx_queues; i++)
igc_configure_tx_ring(adapter, adapter->tx_ring[i]);
}
/**
* igc_setup_mrqc - configure the multiple receive queue control registers
* @adapter: Board private structure
*/
static void igc_setup_mrqc(struct igc_adapter *adapter)
{
}
/**
* igc_setup_rctl - configure the receive control registers
* @adapter: Board private structure
*/
static void igc_setup_rctl(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
u32 rctl;
rctl = rd32(IGC_RCTL);
rctl &= ~(3 << IGC_RCTL_MO_SHIFT);
rctl &= ~(IGC_RCTL_LBM_TCVR | IGC_RCTL_LBM_MAC);
rctl |= IGC_RCTL_EN | IGC_RCTL_BAM | IGC_RCTL_RDMTS_HALF |
(hw->mac.mc_filter_type << IGC_RCTL_MO_SHIFT);
/* enable stripping of CRC. Newer features require
* that the HW strips the CRC.
*/
rctl |= IGC_RCTL_SECRC;
/* disable store bad packets and clear size bits. */
rctl &= ~(IGC_RCTL_SBP | IGC_RCTL_SZ_256);
/* enable LPE to allow for reception of jumbo frames */
rctl |= IGC_RCTL_LPE;
/* disable queue 0 to prevent tail write w/o re-config */
wr32(IGC_RXDCTL(0), 0);
/* This is useful for sniffing bad packets. */
if (adapter->netdev->features & NETIF_F_RXALL) {
/* UPE and MPE will be handled by normal PROMISC logic
* in set_rx_mode
*/
rctl |= (IGC_RCTL_SBP | /* Receive bad packets */
IGC_RCTL_BAM | /* RX All Bcast Pkts */
IGC_RCTL_PMCF); /* RX All MAC Ctrl Pkts */
rctl &= ~(IGC_RCTL_DPF | /* Allow filtered pause */
IGC_RCTL_CFIEN); /* Disable VLAN CFIEN Filter */
}
wr32(IGC_RCTL, rctl);
}
/**
* igc_setup_tctl - configure the transmit control registers
* @adapter: Board private structure
*/
static void igc_setup_tctl(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
u32 tctl;
/* disable queue 0 which icould be enabled by default */
wr32(IGC_TXDCTL(0), 0);
/* Program the Transmit Control Register */
tctl = rd32(IGC_TCTL);
tctl &= ~IGC_TCTL_CT;
tctl |= IGC_TCTL_PSP | IGC_TCTL_RTLC |
(IGC_COLLISION_THRESHOLD << IGC_CT_SHIFT);
/* Enable transmits */
tctl |= IGC_TCTL_EN;
wr32(IGC_TCTL, tctl);
}
/**
* igc_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 igc_set_mac(struct net_device *netdev, void *p)
{
struct igc_adapter *adapter = netdev_priv(netdev);
struct igc_hw *hw = &adapter->hw;
struct sockaddr *addr = p;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
memcpy(hw->mac.addr, addr->sa_data, netdev->addr_len);
/* set the correct pool for the new PF MAC address in entry 0 */
igc_set_default_mac_filter(adapter);
return 0;
}
static void igc_tx_csum(struct igc_ring *tx_ring, struct igc_tx_buffer *first)
{
}
static int __igc_maybe_stop_tx(struct igc_ring *tx_ring, const u16 size)
{
struct net_device *netdev = tx_ring->netdev;
netif_stop_subqueue(netdev, tx_ring->queue_index);
/* memory barriier comment */
smp_mb();
/* We need to check again in a case another CPU has just
* made room available.
*/
if (igc_desc_unused(tx_ring) < size)
return -EBUSY;
/* A reprieve! */
netif_wake_subqueue(netdev, tx_ring->queue_index);
u64_stats_update_begin(&tx_ring->tx_syncp2);
tx_ring->tx_stats.restart_queue2++;
u64_stats_update_end(&tx_ring->tx_syncp2);
return 0;
}
static inline int igc_maybe_stop_tx(struct igc_ring *tx_ring, const u16 size)
{
if (igc_desc_unused(tx_ring) >= size)
return 0;
return __igc_maybe_stop_tx(tx_ring, size);
}
static u32 igc_tx_cmd_type(struct sk_buff *skb, u32 tx_flags)
{
/* set type for advanced descriptor with frame checksum insertion */
u32 cmd_type = IGC_ADVTXD_DTYP_DATA |
IGC_ADVTXD_DCMD_DEXT |
IGC_ADVTXD_DCMD_IFCS;
return cmd_type;
}
static void igc_tx_olinfo_status(struct igc_ring *tx_ring,
union igc_adv_tx_desc *tx_desc,
u32 tx_flags, unsigned int paylen)
{
u32 olinfo_status = paylen << IGC_ADVTXD_PAYLEN_SHIFT;
/* insert L4 checksum */
olinfo_status |= (tx_flags & IGC_TX_FLAGS_CSUM) *
((IGC_TXD_POPTS_TXSM << 8) /
IGC_TX_FLAGS_CSUM);
/* insert IPv4 checksum */
olinfo_status |= (tx_flags & IGC_TX_FLAGS_IPV4) *
(((IGC_TXD_POPTS_IXSM << 8)) /
IGC_TX_FLAGS_IPV4);
tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status);
}
static int igc_tx_map(struct igc_ring *tx_ring,
struct igc_tx_buffer *first,
const u8 hdr_len)
{
struct sk_buff *skb = first->skb;
struct igc_tx_buffer *tx_buffer;
union igc_adv_tx_desc *tx_desc;
u32 tx_flags = first->tx_flags;
struct skb_frag_struct *frag;
u16 i = tx_ring->next_to_use;
unsigned int data_len, size;
dma_addr_t dma;
u32 cmd_type = igc_tx_cmd_type(skb, tx_flags);
tx_desc = IGC_TX_DESC(tx_ring, i);
igc_tx_olinfo_status(tx_ring, tx_desc, tx_flags, skb->len - hdr_len);
size = skb_headlen(skb);
data_len = skb->data_len;
dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
tx_buffer = first;
for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
if (dma_mapping_error(tx_ring->dev, dma))
goto dma_error;
/* record length, and DMA address */
dma_unmap_len_set(tx_buffer, len, size);
dma_unmap_addr_set(tx_buffer, dma, dma);
tx_desc->read.buffer_addr = cpu_to_le64(dma);
while (unlikely(size > IGC_MAX_DATA_PER_TXD)) {
tx_desc->read.cmd_type_len =
cpu_to_le32(cmd_type ^ IGC_MAX_DATA_PER_TXD);
i++;
tx_desc++;
if (i == tx_ring->count) {
tx_desc = IGC_TX_DESC(tx_ring, 0);
i = 0;
}
tx_desc->read.olinfo_status = 0;
dma += IGC_MAX_DATA_PER_TXD;
size -= IGC_MAX_DATA_PER_TXD;
tx_desc->read.buffer_addr = cpu_to_le64(dma);
}
if (likely(!data_len))
break;
tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type ^ size);
i++;
tx_desc++;
if (i == tx_ring->count) {
tx_desc = IGC_TX_DESC(tx_ring, 0);
i = 0;
}
tx_desc->read.olinfo_status = 0;
size = skb_frag_size(frag);
data_len -= size;
dma = skb_frag_dma_map(tx_ring->dev, frag, 0,
size, DMA_TO_DEVICE);
tx_buffer = &tx_ring->tx_buffer_info[i];
}
/* write last descriptor with RS and EOP bits */
cmd_type |= size | IGC_TXD_DCMD;
tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount);
/* set the timestamp */
first->time_stamp = jiffies;
skb_tx_timestamp(skb);
/* 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).
*
* We also need this memory barrier to make certain all of the
* status bits have been updated before next_to_watch is written.
*/
wmb();
/* set next_to_watch value indicating a packet is present */
first->next_to_watch = tx_desc;
i++;
if (i == tx_ring->count)
i = 0;
tx_ring->next_to_use = i;
/* Make sure there is space in the ring for the next send. */
igc_maybe_stop_tx(tx_ring, DESC_NEEDED);
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
/* we need this if more than one processor can write to our tail
* at a time, it synchronizes IO on IA64/Altix systems
*/
mmiowb();
}
return 0;
dma_error:
dev_err(tx_ring->dev, "TX DMA map failed\n");
tx_buffer = &tx_ring->tx_buffer_info[i];
/* clear dma mappings for failed tx_buffer_info map */
while (tx_buffer != first) {
if (dma_unmap_len(tx_buffer, len))
dma_unmap_page(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
dma_unmap_len_set(tx_buffer, len, 0);
if (i-- == 0)
i += tx_ring->count;
tx_buffer = &tx_ring->tx_buffer_info[i];
}
if (dma_unmap_len(tx_buffer, len))
dma_unmap_single(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
dma_unmap_len_set(tx_buffer, len, 0);
dev_kfree_skb_any(tx_buffer->skb);
tx_buffer->skb = NULL;
tx_ring->next_to_use = i;
return -1;
}
static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
struct igc_ring *tx_ring)
{
u16 count = TXD_USE_COUNT(skb_headlen(skb));
__be16 protocol = vlan_get_protocol(skb);
struct igc_tx_buffer *first;
u32 tx_flags = 0;
unsigned short f;
u8 hdr_len = 0;
/* need: 1 descriptor per page * PAGE_SIZE/IGC_MAX_DATA_PER_TXD,
* + 1 desc for skb_headlen/IGC_MAX_DATA_PER_TXD,
* + 2 desc gap to keep tail from touching head,
* + 1 desc for context descriptor,
* otherwise try next time
*/
for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
if (igc_maybe_stop_tx(tx_ring, count + 3)) {
/* this is a hard error */
return NETDEV_TX_BUSY;
}
/* record the location of the first descriptor for this packet */
first = &tx_ring->tx_buffer_info[tx_ring->next_to_use];
first->skb = skb;
first->bytecount = skb->len;
first->gso_segs = 1;
/* record initial flags and protocol */
first->tx_flags = tx_flags;
first->protocol = protocol;
igc_tx_csum(tx_ring, first);
igc_tx_map(tx_ring, first, hdr_len);
return NETDEV_TX_OK;
}
static inline struct igc_ring *igc_tx_queue_mapping(struct igc_adapter *adapter,
struct sk_buff *skb)
{
unsigned int r_idx = skb->queue_mapping;
if (r_idx >= adapter->num_tx_queues)
r_idx = r_idx % adapter->num_tx_queues;
return adapter->tx_ring[r_idx];
}
static netdev_tx_t igc_xmit_frame(struct sk_buff *skb,
struct net_device *netdev)
{
struct igc_adapter *adapter = netdev_priv(netdev);
/* The minimum packet size with TCTL.PSP set is 17 so pad the skb
* in order to meet this minimum size requirement.
*/
if (skb->len < 17) {
if (skb_padto(skb, 17))
return NETDEV_TX_OK;
skb->len = 17;
}
return igc_xmit_frame_ring(skb, igc_tx_queue_mapping(adapter, skb));
}
static inline void igc_rx_hash(struct igc_ring *ring,
union igc_adv_rx_desc *rx_desc,
struct sk_buff *skb)
{
if (ring->netdev->features & NETIF_F_RXHASH)
skb_set_hash(skb,
le32_to_cpu(rx_desc->wb.lower.hi_dword.rss),
PKT_HASH_TYPE_L3);
}
/**
* igc_process_skb_fields - Populate skb header fields from Rx descriptor
* @rx_ring: rx descriptor ring packet is being transacted on
* @rx_desc: pointer to the EOP Rx descriptor
* @skb: pointer to current skb being populated
*
* This function checks the ring, descriptor, and packet information in
* order to populate the hash, checksum, VLAN, timestamp, protocol, and
* other fields within the skb.
*/
static void igc_process_skb_fields(struct igc_ring *rx_ring,
union igc_adv_rx_desc *rx_desc,
struct sk_buff *skb)
{
igc_rx_hash(rx_ring, rx_desc, skb);
skb_record_rx_queue(skb, rx_ring->queue_index);
skb->protocol = eth_type_trans(skb, rx_ring->netdev);
}
static struct igc_rx_buffer *igc_get_rx_buffer(struct igc_ring *rx_ring,
const unsigned int size)
{
struct igc_rx_buffer *rx_buffer;
rx_buffer = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
prefetchw(rx_buffer->page);
/* we are reusing so sync this buffer for CPU use */
dma_sync_single_range_for_cpu(rx_ring->dev,
rx_buffer->dma,
rx_buffer->page_offset,
size,
DMA_FROM_DEVICE);
rx_buffer->pagecnt_bias--;
return rx_buffer;
}
/**
* igc_add_rx_frag - Add contents of Rx buffer to sk_buff
* @rx_ring: rx descriptor ring to transact packets on
* @rx_buffer: buffer containing page to add
* @skb: sk_buff to place the data into
* @size: size of buffer to be added
*
* This function will add the data contained in rx_buffer->page to the skb.
*/
static void igc_add_rx_frag(struct igc_ring *rx_ring,
struct igc_rx_buffer *rx_buffer,
struct sk_buff *skb,
unsigned int size)
{
#if (PAGE_SIZE < 8192)
unsigned int truesize = igc_rx_pg_size(rx_ring) / 2;
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
rx_buffer->page_offset, size, truesize);
rx_buffer->page_offset ^= truesize;
#else
unsigned int truesize = ring_uses_build_skb(rx_ring) ?
SKB_DATA_ALIGN(IGC_SKB_PAD + size) :
SKB_DATA_ALIGN(size);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
rx_buffer->page_offset, size, truesize);
rx_buffer->page_offset += truesize;
#endif
}
static struct sk_buff *igc_build_skb(struct igc_ring *rx_ring,
struct igc_rx_buffer *rx_buffer,
union igc_adv_rx_desc *rx_desc,
unsigned int size)
{
void *va = page_address(rx_buffer->page) + rx_buffer->page_offset;
#if (PAGE_SIZE < 8192)
unsigned int truesize = igc_rx_pg_size(rx_ring) / 2;
#else
unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
SKB_DATA_ALIGN(IGC_SKB_PAD + size);
#endif
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
/* build an skb around the page buffer */
skb = build_skb(va - IGC_SKB_PAD, truesize);
if (unlikely(!skb))
return NULL;
/* update pointers within the skb to store the data */
skb_reserve(skb, IGC_SKB_PAD);
__skb_put(skb, size);
/* update buffer offset */
#if (PAGE_SIZE < 8192)
rx_buffer->page_offset ^= truesize;
#else
rx_buffer->page_offset += truesize;
#endif
return skb;
}
static struct sk_buff *igc_construct_skb(struct igc_ring *rx_ring,
struct igc_rx_buffer *rx_buffer,
union igc_adv_rx_desc *rx_desc,
unsigned int size)
{
void *va = page_address(rx_buffer->page) + rx_buffer->page_offset;
#if (PAGE_SIZE < 8192)
unsigned int truesize = igc_rx_pg_size(rx_ring) / 2;
#else
unsigned int truesize = SKB_DATA_ALIGN(size);
#endif
unsigned int headlen;
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(va);
#if L1_CACHE_BYTES < 128
prefetch(va + L1_CACHE_BYTES);
#endif
/* allocate a skb to store the frags */
skb = napi_alloc_skb(&rx_ring->q_vector->napi, IGC_RX_HDR_LEN);
if (unlikely(!skb))
return NULL;
/* Determine available headroom for copy */
headlen = size;
if (headlen > IGC_RX_HDR_LEN)
headlen = eth_get_headlen(va, IGC_RX_HDR_LEN);
/* align pull length to size of long to optimize memcpy performance */
memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
/* update all of the pointers */
size -= headlen;
if (size) {
skb_add_rx_frag(skb, 0, rx_buffer->page,
(va + headlen) - page_address(rx_buffer->page),
size, truesize);
#if (PAGE_SIZE < 8192)
rx_buffer->page_offset ^= truesize;
#else
rx_buffer->page_offset += truesize;
#endif
} else {
rx_buffer->pagecnt_bias++;
}
return skb;
}
/**
* igc_reuse_rx_page - page flip buffer and store it back on the ring
* @rx_ring: rx descriptor ring to store buffers on
* @old_buff: donor buffer to have page reused
*
* Synchronizes page for reuse by the adapter
*/
static void igc_reuse_rx_page(struct igc_ring *rx_ring,
struct igc_rx_buffer *old_buff)
{
u16 nta = rx_ring->next_to_alloc;
struct igc_rx_buffer *new_buff;
new_buff = &rx_ring->rx_buffer_info[nta];
/* update, and store next to alloc */
nta++;
rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
/* Transfer page from old buffer to new buffer.
* Move each member individually to avoid possible store
* forwarding stalls.
*/
new_buff->dma = old_buff->dma;
new_buff->page = old_buff->page;
new_buff->page_offset = old_buff->page_offset;
new_buff->pagecnt_bias = old_buff->pagecnt_bias;
}
static inline bool igc_page_is_reserved(struct page *page)
{
return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
}
static bool igc_can_reuse_rx_page(struct igc_rx_buffer *rx_buffer)
{
unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
struct page *page = rx_buffer->page;
/* avoid re-using remote pages */
if (unlikely(igc_page_is_reserved(page)))
return false;
#if (PAGE_SIZE < 8192)
/* if we are only owner of page we can reuse it */
if (unlikely((page_ref_count(page) - pagecnt_bias) > 1))
return false;
#else
#define IGC_LAST_OFFSET \
(SKB_WITH_OVERHEAD(PAGE_SIZE) - IGC_RXBUFFER_2048)
if (rx_buffer->page_offset > IGC_LAST_OFFSET)
return false;
#endif
/* If we have drained the page fragment pool we need to update
* the pagecnt_bias and page count so that we fully restock the
* number of references the driver holds.
*/
if (unlikely(!pagecnt_bias)) {
page_ref_add(page, USHRT_MAX);
rx_buffer->pagecnt_bias = USHRT_MAX;
}
return true;
}
/**
* igc_is_non_eop - process handling of non-EOP buffers
* @rx_ring: Rx ring being processed
* @rx_desc: Rx descriptor for current buffer
* @skb: current socket buffer containing buffer in progress
*
* This function updates next to clean. If the buffer is an EOP buffer
* this function exits returning false, otherwise it will place the
* sk_buff in the next buffer to be chained and return true indicating
* that this is in fact a non-EOP buffer.
*/
static bool igc_is_non_eop(struct igc_ring *rx_ring,
union igc_adv_rx_desc *rx_desc)
{
u32 ntc = rx_ring->next_to_clean + 1;
/* fetch, update, and store next to clean */
ntc = (ntc < rx_ring->count) ? ntc : 0;
rx_ring->next_to_clean = ntc;
prefetch(IGC_RX_DESC(rx_ring, ntc));
if (likely(igc_test_staterr(rx_desc, IGC_RXD_STAT_EOP)))
return false;
return true;
}
/**
* igc_cleanup_headers - Correct corrupted or empty headers
* @rx_ring: rx descriptor ring packet is being transacted on
* @rx_desc: pointer to the EOP Rx descriptor
* @skb: pointer to current skb being fixed
*
* Address the case where we are pulling data in on pages only
* and as such no data is present in the skb header.
*
* In addition if skb is not at least 60 bytes we need to pad it so that
* it is large enough to qualify as a valid Ethernet frame.
*
* Returns true if an error was encountered and skb was freed.
*/
static bool igc_cleanup_headers(struct igc_ring *rx_ring,
union igc_adv_rx_desc *rx_desc,
struct sk_buff *skb)
{
if (unlikely((igc_test_staterr(rx_desc,
IGC_RXDEXT_ERR_FRAME_ERR_MASK)))) {
struct net_device *netdev = rx_ring->netdev;
if (!(netdev->features & NETIF_F_RXALL)) {
dev_kfree_skb_any(skb);
return true;
}
}
/* if eth_skb_pad returns an error the skb was freed */
if (eth_skb_pad(skb))
return true;
return false;
}
static void igc_put_rx_buffer(struct igc_ring *rx_ring,
struct igc_rx_buffer *rx_buffer)
{
if (igc_can_reuse_rx_page(rx_buffer)) {
/* hand second half of page back to the ring */
igc_reuse_rx_page(rx_ring, rx_buffer);
} else {
/* We are not reusing the buffer so unmap it and free
* any references we are holding to it
*/
dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
igc_rx_pg_size(rx_ring), DMA_FROM_DEVICE,
IGC_RX_DMA_ATTR);
__page_frag_cache_drain(rx_buffer->page,
rx_buffer->pagecnt_bias);
}
/* clear contents of rx_buffer */
rx_buffer->page = NULL;
}
/**
* igc_alloc_rx_buffers - Replace used receive buffers; packet split
* @adapter: address of board private structure
*/
static void igc_alloc_rx_buffers(struct igc_ring *rx_ring, u16 cleaned_count)
{
union igc_adv_rx_desc *rx_desc;
u16 i = rx_ring->next_to_use;
struct igc_rx_buffer *bi;
u16 bufsz;
/* nothing to do */
if (!cleaned_count)
return;
rx_desc = IGC_RX_DESC(rx_ring, i);
bi = &rx_ring->rx_buffer_info[i];
i -= rx_ring->count;
bufsz = igc_rx_bufsz(rx_ring);
do {
if (!igc_alloc_mapped_page(rx_ring, bi))
break;
/* sync the buffer for use by the device */
dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
bi->page_offset, bufsz,
DMA_FROM_DEVICE);
/* Refresh the desc even if buffer_addrs didn't change
* because each write-back erases this info.
*/
rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
rx_desc++;
bi++;
i++;
if (unlikely(!i)) {
rx_desc = IGC_RX_DESC(rx_ring, 0);
bi = rx_ring->rx_buffer_info;
i -= rx_ring->count;
}
/* clear the length for the next_to_use descriptor */
rx_desc->wb.upper.length = 0;
cleaned_count--;
} while (cleaned_count);
i += rx_ring->count;
if (rx_ring->next_to_use != i) {
/* record the next descriptor to use */
rx_ring->next_to_use = i;
/* update next to alloc since we have filled the ring */
rx_ring->next_to_alloc = 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();
writel(i, rx_ring->tail);
}
}
static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
{
unsigned int total_bytes = 0, total_packets = 0;
struct igc_ring *rx_ring = q_vector->rx.ring;
struct sk_buff *skb = rx_ring->skb;
u16 cleaned_count = igc_desc_unused(rx_ring);
while (likely(total_packets < budget)) {
union igc_adv_rx_desc *rx_desc;
struct igc_rx_buffer *rx_buffer;
unsigned int size;
/* return some buffers to hardware, one at a time is too slow */
if (cleaned_count >= IGC_RX_BUFFER_WRITE) {
igc_alloc_rx_buffers(rx_ring, cleaned_count);
cleaned_count = 0;
}
rx_desc = IGC_RX_DESC(rx_ring, rx_ring->next_to_clean);
size = le16_to_cpu(rx_desc->wb.upper.length);
if (!size)
break;
/* This memory barrier is needed to keep us from reading
* any other fields out of the rx_desc until we know the
* descriptor has been written back
*/
dma_rmb();
rx_buffer = igc_get_rx_buffer(rx_ring, size);
/* retrieve a buffer from the ring */
if (skb)
igc_add_rx_frag(rx_ring, rx_buffer, skb, size);
else if (ring_uses_build_skb(rx_ring))
skb = igc_build_skb(rx_ring, rx_buffer, rx_desc, size);
else
skb = igc_construct_skb(rx_ring, rx_buffer,
rx_desc, size);
/* exit if we failed to retrieve a buffer */
if (!skb) {
rx_ring->rx_stats.alloc_failed++;
rx_buffer->pagecnt_bias++;
break;
}
igc_put_rx_buffer(rx_ring, rx_buffer);
cleaned_count++;
/* fetch next buffer in frame if non-eop */
if (igc_is_non_eop(rx_ring, rx_desc))
continue;
/* verify the packet layout is correct */
if (igc_cleanup_headers(rx_ring, rx_desc, skb)) {
skb = NULL;
continue;
}
/* probably a little skewed due to removing CRC */
total_bytes += skb->len;
/* populate checksum, timestamp, VLAN, and protocol */
igc_process_skb_fields(rx_ring, rx_desc, skb);
napi_gro_receive(&q_vector->napi, skb);
/* reset skb pointer */
skb = NULL;
/* update budget accounting */
total_packets++;
}
/* place incomplete frames back on ring for completion */
rx_ring->skb = skb;
u64_stats_update_begin(&rx_ring->rx_syncp);
rx_ring->rx_stats.packets += total_packets;
rx_ring->rx_stats.bytes += total_bytes;
u64_stats_update_end(&rx_ring->rx_syncp);
q_vector->rx.total_packets += total_packets;
q_vector->rx.total_bytes += total_bytes;
if (cleaned_count)
igc_alloc_rx_buffers(rx_ring, cleaned_count);
return total_packets;
}
static inline unsigned int igc_rx_offset(struct igc_ring *rx_ring)
{
return ring_uses_build_skb(rx_ring) ? IGC_SKB_PAD : 0;
}
static bool igc_alloc_mapped_page(struct igc_ring *rx_ring,
struct igc_rx_buffer *bi)
{
struct page *page = bi->page;
dma_addr_t dma;
/* since we are recycling buffers we should seldom need to alloc */
if (likely(page))
return true;
/* alloc new page for storage */
page = dev_alloc_pages(igc_rx_pg_order(rx_ring));
if (unlikely(!page)) {
rx_ring->rx_stats.alloc_failed++;
return false;
}
/* map page for use */
dma = dma_map_page_attrs(rx_ring->dev, page, 0,
igc_rx_pg_size(rx_ring),
DMA_FROM_DEVICE,
IGC_RX_DMA_ATTR);
/* if mapping failed free memory back to system since
* there isn't much point in holding memory we can't use
*/
if (dma_mapping_error(rx_ring->dev, dma)) {
__free_page(page);
rx_ring->rx_stats.alloc_failed++;
return false;
}
bi->dma = dma;
bi->page = page;
bi->page_offset = igc_rx_offset(rx_ring);
bi->pagecnt_bias = 1;
return true;
}
/**
* igc_clean_tx_irq - Reclaim resources after transmit completes
* @q_vector: pointer to q_vector containing needed info
* @napi_budget: Used to determine if we are in netpoll
*
* returns true if ring is completely cleaned
*/
static bool igc_clean_tx_irq(struct igc_q_vector *q_vector, int napi_budget)
{
struct igc_adapter *adapter = q_vector->adapter;
unsigned int total_bytes = 0, total_packets = 0;
unsigned int budget = q_vector->tx.work_limit;
struct igc_ring *tx_ring = q_vector->tx.ring;
unsigned int i = tx_ring->next_to_clean;
struct igc_tx_buffer *tx_buffer;
union igc_adv_tx_desc *tx_desc;
if (test_bit(__IGC_DOWN, &adapter->state))
return true;
tx_buffer = &tx_ring->tx_buffer_info[i];
tx_desc = IGC_TX_DESC(tx_ring, i);
i -= tx_ring->count;
do {
union igc_adv_tx_desc *eop_desc = tx_buffer->next_to_watch;
/* if next_to_watch is not set then there is no work pending */
if (!eop_desc)
break;
/* prevent any other reads prior to eop_desc */
smp_rmb();
/* if DD is not set pending work has not been completed */
if (!(eop_desc->wb.status & cpu_to_le32(IGC_TXD_STAT_DD)))
break;
/* clear next_to_watch to prevent false hangs */
tx_buffer->next_to_watch = NULL;
/* update the statistics for this packet */
total_bytes += tx_buffer->bytecount;
total_packets += tx_buffer->gso_segs;
/* free the skb */
napi_consume_skb(tx_buffer->skb, napi_budget);
/* unmap skb header data */
dma_unmap_single(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
/* clear tx_buffer data */
dma_unmap_len_set(tx_buffer, len, 0);
/* clear last DMA location and unmap remaining buffers */
while (tx_desc != eop_desc) {
tx_buffer++;
tx_desc++;
i++;
if (unlikely(!i)) {
i -= tx_ring->count;
tx_buffer = tx_ring->tx_buffer_info;
tx_desc = IGC_TX_DESC(tx_ring, 0);
}
/* unmap any remaining paged data */
if (dma_unmap_len(tx_buffer, len)) {
dma_unmap_page(tx_ring->dev,
dma_unmap_addr(tx_buffer, dma),
dma_unmap_len(tx_buffer, len),
DMA_TO_DEVICE);
dma_unmap_len_set(tx_buffer, len, 0);
}
}
/* move us one more past the eop_desc for start of next pkt */
tx_buffer++;
tx_desc++;
i++;
if (unlikely(!i)) {
i -= tx_ring->count;
tx_buffer = tx_ring->tx_buffer_info;
tx_desc = IGC_TX_DESC(tx_ring, 0);
}
/* issue prefetch for next Tx descriptor */
prefetch(tx_desc);
/* update budget accounting */
budget--;
} while (likely(budget));
netdev_tx_completed_queue(txring_txq(tx_ring),
total_packets, total_bytes);
i += tx_ring->count;
tx_ring->next_to_clean = i;
u64_stats_update_begin(&tx_ring->tx_syncp);
tx_ring->tx_stats.bytes += total_bytes;
tx_ring->tx_stats.packets += total_packets;
u64_stats_update_end(&tx_ring->tx_syncp);
q_vector->tx.total_bytes += total_bytes;
q_vector->tx.total_packets += total_packets;
if (test_bit(IGC_RING_FLAG_TX_DETECT_HANG, &tx_ring->flags)) {
struct igc_hw *hw = &adapter->hw;
/* Detect a transmit hang in hardware, this serializes the
* check with the clearing of time_stamp and movement of i
*/
clear_bit(IGC_RING_FLAG_TX_DETECT_HANG, &tx_ring->flags);
if (tx_buffer->next_to_watch &&
time_after(jiffies, tx_buffer->time_stamp +
(adapter->tx_timeout_factor * HZ)) &&
!(rd32(IGC_STATUS) & IGC_STATUS_TXOFF)) {
/* detected Tx unit hang */
dev_err(tx_ring->dev,
"Detected Tx Unit Hang\n"
" Tx Queue <%d>\n"
" TDH <%x>\n"
" TDT <%x>\n"
" next_to_use <%x>\n"
" next_to_clean <%x>\n"
"buffer_info[next_to_clean]\n"
" time_stamp <%lx>\n"
" next_to_watch <%p>\n"
" jiffies <%lx>\n"
" desc.status <%x>\n",
tx_ring->queue_index,
rd32(IGC_TDH(tx_ring->reg_idx)),
readl(tx_ring->tail),
tx_ring->next_to_use,
tx_ring->next_to_clean,
tx_buffer->time_stamp,
tx_buffer->next_to_watch,
jiffies,
tx_buffer->next_to_watch->wb.status);
netif_stop_subqueue(tx_ring->netdev,
tx_ring->queue_index);
/* we are about to reset, no point in enabling stuff */
return true;
}
}
#define TX_WAKE_THRESHOLD (DESC_NEEDED * 2)
if (unlikely(total_packets &&
netif_carrier_ok(tx_ring->netdev) &&
igc_desc_unused(tx_ring) >= TX_WAKE_THRESHOLD)) {
/* Make sure that anybody stopping the queue after this
* sees the new next_to_clean.
*/
smp_mb();
if (__netif_subqueue_stopped(tx_ring->netdev,
tx_ring->queue_index) &&
!(test_bit(__IGC_DOWN, &adapter->state))) {
netif_wake_subqueue(tx_ring->netdev,
tx_ring->queue_index);
u64_stats_update_begin(&tx_ring->tx_syncp);
tx_ring->tx_stats.restart_queue++;
u64_stats_update_end(&tx_ring->tx_syncp);
}
}
return !!budget;
}
/**
* igc_ioctl - I/O control method
* @netdev: network interface device structure
* @ifreq: frequency
* @cmd: command
*/
static int igc_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
switch (cmd) {
default:
return -EOPNOTSUPP;
}
}
/**
* igc_up - Open the interface and prepare it to handle traffic
* @adapter: board private structure
*/
static void igc_up(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
int i = 0;
/* hardware has been reset, we need to reload some things */
igc_configure(adapter);
clear_bit(__IGC_DOWN, &adapter->state);
for (i = 0; i < adapter->num_q_vectors; i++)
napi_enable(&adapter->q_vector[i]->napi);
if (adapter->msix_entries)
igc_configure_msix(adapter);
else
igc_assign_vector(adapter->q_vector[0], 0);
/* Clear any pending interrupts. */
rd32(IGC_ICR);
igc_irq_enable(adapter);
netif_tx_start_all_queues(adapter->netdev);
/* start the watchdog. */
hw->mac.get_link_status = 1;
schedule_work(&adapter->watchdog_task);
}
/**
* igc_update_stats - Update the board statistics counters
* @adapter: board private structure
*/
static void igc_update_stats(struct igc_adapter *adapter)
{
}
static void igc_nfc_filter_exit(struct igc_adapter *adapter)
{
}
/**
* igc_down - Close the interface
* @adapter: board private structure
*/
static void igc_down(struct igc_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct igc_hw *hw = &adapter->hw;
u32 tctl, rctl;
int i = 0;
set_bit(__IGC_DOWN, &adapter->state);
/* disable receives in the hardware */
rctl = rd32(IGC_RCTL);
wr32(IGC_RCTL, rctl & ~IGC_RCTL_EN);
/* flush and sleep below */
igc_nfc_filter_exit(adapter);
/* set trans_start so we don't get spurious watchdogs during reset */
netif_trans_update(netdev);
netif_carrier_off(netdev);
netif_tx_stop_all_queues(netdev);
/* disable transmits in the hardware */
tctl = rd32(IGC_TCTL);
tctl &= ~IGC_TCTL_EN;
wr32(IGC_TCTL, tctl);
/* flush both disables and wait for them to finish */
wrfl();
usleep_range(10000, 20000);
igc_irq_disable(adapter);
adapter->flags &= ~IGC_FLAG_NEED_LINK_UPDATE;
for (i = 0; i < adapter->num_q_vectors; i++) {
if (adapter->q_vector[i]) {
napi_synchronize(&adapter->q_vector[i]->napi);
napi_disable(&adapter->q_vector[i]->napi);
}
}
del_timer_sync(&adapter->watchdog_timer);
del_timer_sync(&adapter->phy_info_timer);
/* record the stats before reset*/
spin_lock(&adapter->stats64_lock);
igc_update_stats(adapter);
spin_unlock(&adapter->stats64_lock);
adapter->link_speed = 0;
adapter->link_duplex = 0;
if (!pci_channel_offline(adapter->pdev))
igc_reset(adapter);
/* clear VLAN promisc flag so VFTA will be updated if necessary */
adapter->flags &= ~IGC_FLAG_VLAN_PROMISC;
igc_clean_all_tx_rings(adapter);
igc_clean_all_rx_rings(adapter);
}
static void igc_reinit_locked(struct igc_adapter *adapter)
{
WARN_ON(in_interrupt());
while (test_and_set_bit(__IGC_RESETTING, &adapter->state))
usleep_range(1000, 2000);
igc_down(adapter);
igc_up(adapter);
clear_bit(__IGC_RESETTING, &adapter->state);
}
static void igc_reset_task(struct work_struct *work)
{
struct igc_adapter *adapter;
adapter = container_of(work, struct igc_adapter, reset_task);
netdev_err(adapter->netdev, "Reset adapter\n");
igc_reinit_locked(adapter);
}
/**
* igc_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 igc_change_mtu(struct net_device *netdev, int new_mtu)
{
int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
struct igc_adapter *adapter = netdev_priv(netdev);
struct pci_dev *pdev = adapter->pdev;
/* adjust max frame to be at least the size of a standard frame */
if (max_frame < (ETH_FRAME_LEN + ETH_FCS_LEN))
max_frame = ETH_FRAME_LEN + ETH_FCS_LEN;
while (test_and_set_bit(__IGC_RESETTING, &adapter->state))
usleep_range(1000, 2000);
/* igc_down has a dependency on max_frame_size */
adapter->max_frame_size = max_frame;
if (netif_running(netdev))
igc_down(adapter);
dev_info(&pdev->dev, "changing MTU from %d to %d\n",
netdev->mtu, new_mtu);
netdev->mtu = new_mtu;
if (netif_running(netdev))
igc_up(adapter);
else
igc_reset(adapter);
clear_bit(__IGC_RESETTING, &adapter->state);
return 0;
}
/**
* igc_get_stats - Get System Network Statistics
* @netdev: network interface device structure
*
* Returns the address of the device statistics structure.
* The statistics are updated here and also from the timer callback.
*/
static struct net_device_stats *igc_get_stats(struct net_device *netdev)
{
struct igc_adapter *adapter = netdev_priv(netdev);
if (!test_bit(__IGC_RESETTING, &adapter->state))
igc_update_stats(adapter);
/* only return the current stats */
return &netdev->stats;
}
/**
* igc_configure - configure the hardware for RX and TX
* @adapter: private board structure
*/
static void igc_configure(struct igc_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
int i = 0;
igc_get_hw_control(adapter);
igc_set_rx_mode(netdev);
igc_setup_tctl(adapter);
igc_setup_mrqc(adapter);
igc_setup_rctl(adapter);
igc_configure_tx(adapter);
igc_configure_rx(adapter);
igc_rx_fifo_flush_base(&adapter->hw);
/* call igc_desc_unused which always leaves
* at least 1 descriptor unused to make sure
* next_to_use != next_to_clean
*/
for (i = 0; i < adapter->num_rx_queues; i++) {
struct igc_ring *ring = adapter->rx_ring[i];
igc_alloc_rx_buffers(ring, igc_desc_unused(ring));
}
}
/**
* igc_rar_set_index - Sync RAL[index] and RAH[index] registers with MAC table
* @adapter: Pointer to adapter structure
* @index: Index of the RAR entry which need to be synced with MAC table
*/
static void igc_rar_set_index(struct igc_adapter *adapter, u32 index)
{
u8 *addr = adapter->mac_table[index].addr;
struct igc_hw *hw = &adapter->hw;
u32 rar_low, rar_high;
/* HW expects these to be in network order when they are plugged
* into the registers which are little endian. In order to guarantee
* that ordering we need to do an leXX_to_cpup here in order to be
* ready for the byteswap that occurs with writel
*/
rar_low = le32_to_cpup((__le32 *)(addr));
rar_high = le16_to_cpup((__le16 *)(addr + 4));
/* Indicate to hardware the Address is Valid. */
if (adapter->mac_table[index].state & IGC_MAC_STATE_IN_USE) {
if (is_valid_ether_addr(addr))
rar_high |= IGC_RAH_AV;
rar_high |= IGC_RAH_POOL_1 <<
adapter->mac_table[index].queue;
}
wr32(IGC_RAL(index), rar_low);
wrfl();
wr32(IGC_RAH(index), rar_high);
wrfl();
}
/* Set default MAC address for the PF in the first RAR entry */
static void igc_set_default_mac_filter(struct igc_adapter *adapter)
{
struct igc_mac_addr *mac_table = &adapter->mac_table[0];
ether_addr_copy(mac_table->addr, adapter->hw.mac.addr);
mac_table->state = IGC_MAC_STATE_DEFAULT | IGC_MAC_STATE_IN_USE;
igc_rar_set_index(adapter, 0);
}
/**
* igc_set_rx_mode - Secondary Unicast, Multicast and Promiscuous mode set
* @netdev: network interface device structure
*
* The set_rx_mode entry point is called whenever the unicast or multicast
* address lists or the network interface flags are updated. This routine is
* responsible for configuring the hardware for proper unicast, multicast,
* promiscuous mode, and all-multi behavior.
*/
static void igc_set_rx_mode(struct net_device *netdev)
{
}
/**
* igc_msix_other - msix other interrupt handler
* @irq: interrupt number
* @data: pointer to a q_vector
*/
static irqreturn_t igc_msix_other(int irq, void *data)
{
struct igc_adapter *adapter = data;
struct igc_hw *hw = &adapter->hw;
u32 icr = rd32(IGC_ICR);
/* reading ICR causes bit 31 of EICR to be cleared */
if (icr & IGC_ICR_DRSTA)
schedule_work(&adapter->reset_task);
if (icr & IGC_ICR_DOUTSYNC) {
/* HW is reporting DMA is out of sync */
adapter->stats.doosync++;
}
if (icr & IGC_ICR_LSC) {
hw->mac.get_link_status = 1;
/* guard against interrupt when we're going down */
if (!test_bit(__IGC_DOWN, &adapter->state))
mod_timer(&adapter->watchdog_timer, jiffies + 1);
}
wr32(IGC_EIMS, adapter->eims_other);
return IRQ_HANDLED;
}
/**
* igc_write_ivar - configure ivar for given MSI-X vector
* @hw: pointer to the HW structure
* @msix_vector: vector number we are allocating to a given ring
* @index: row index of IVAR register to write within IVAR table
* @offset: column offset of in IVAR, should be multiple of 8
*
* The IVAR table consists of 2 columns,
* each containing an cause allocation for an Rx and Tx ring, and a
* variable number of rows depending on the number of queues supported.
*/
static void igc_write_ivar(struct igc_hw *hw, int msix_vector,
int index, int offset)
{
u32 ivar = array_rd32(IGC_IVAR0, index);
/* clear any bits that are currently set */
ivar &= ~((u32)0xFF << offset);
/* write vector and valid bit */
ivar |= (msix_vector | IGC_IVAR_VALID) << offset;
array_wr32(IGC_IVAR0, index, ivar);
}
static void igc_assign_vector(struct igc_q_vector *q_vector, int msix_vector)
{
struct igc_adapter *adapter = q_vector->adapter;
struct igc_hw *hw = &adapter->hw;
int rx_queue = IGC_N0_QUEUE;
int tx_queue = IGC_N0_QUEUE;
if (q_vector->rx.ring)
rx_queue = q_vector->rx.ring->reg_idx;
if (q_vector->tx.ring)
tx_queue = q_vector->tx.ring->reg_idx;
switch (hw->mac.type) {
case igc_i225:
if (rx_queue > IGC_N0_QUEUE)
igc_write_ivar(hw, msix_vector,
rx_queue >> 1,
(rx_queue & 0x1) << 4);
if (tx_queue > IGC_N0_QUEUE)
igc_write_ivar(hw, msix_vector,
tx_queue >> 1,
((tx_queue & 0x1) << 4) + 8);
q_vector->eims_value = BIT(msix_vector);
break;
default:
WARN_ONCE(hw->mac.type != igc_i225, "Wrong MAC type\n");
break;
}
/* add q_vector eims value to global eims_enable_mask */
adapter->eims_enable_mask |= q_vector->eims_value;
/* configure q_vector to set itr on first interrupt */
q_vector->set_itr = 1;
}
/**
* igc_configure_msix - Configure MSI-X hardware
* @adapter: Pointer to adapter structure
*
* igc_configure_msix sets up the hardware to properly
* generate MSI-X interrupts.
*/
static void igc_configure_msix(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
int i, vector = 0;
u32 tmp;
adapter->eims_enable_mask = 0;
/* set vector for other causes, i.e. link changes */
switch (hw->mac.type) {
case igc_i225:
/* Turn on MSI-X capability first, or our settings
* won't stick. And it will take days to debug.
*/
wr32(IGC_GPIE, IGC_GPIE_MSIX_MODE |
IGC_GPIE_PBA | IGC_GPIE_EIAME |
IGC_GPIE_NSICR);
/* enable msix_other interrupt */
adapter->eims_other = BIT(vector);
tmp = (vector++ | IGC_IVAR_VALID) << 8;
wr32(IGC_IVAR_MISC, tmp);
break;
default:
/* do nothing, since nothing else supports MSI-X */
break;
} /* switch (hw->mac.type) */
adapter->eims_enable_mask |= adapter->eims_other;
for (i = 0; i < adapter->num_q_vectors; i++)
igc_assign_vector(adapter->q_vector[i], vector++);
wrfl();
}
static irqreturn_t igc_msix_ring(int irq, void *data)
{
struct igc_q_vector *q_vector = data;
/* Write the ITR value calculated from the previous interrupt. */
igc_write_itr(q_vector);
napi_schedule(&q_vector->napi);
return IRQ_HANDLED;
}
/**
* igc_request_msix - Initialize MSI-X interrupts
* @adapter: Pointer to adapter structure
*
* igc_request_msix allocates MSI-X vectors and requests interrupts from the
* kernel.
*/
static int igc_request_msix(struct igc_adapter *adapter)
{
int i = 0, err = 0, vector = 0, free_vector = 0;
struct net_device *netdev = adapter->netdev;
err = request_irq(adapter->msix_entries[vector].vector,
&igc_msix_other, 0, netdev->name, adapter);
if (err)
goto err_out;
for (i = 0; i < adapter->num_q_vectors; i++) {
struct igc_q_vector *q_vector = adapter->q_vector[i];
vector++;
q_vector->itr_register = adapter->io_addr + IGC_EITR(vector);
if (q_vector->rx.ring && q_vector->tx.ring)
sprintf(q_vector->name, "%s-TxRx-%u", netdev->name,
q_vector->rx.ring->queue_index);
else if (q_vector->tx.ring)
sprintf(q_vector->name, "%s-tx-%u", netdev->name,
q_vector->tx.ring->queue_index);
else if (q_vector->rx.ring)
sprintf(q_vector->name, "%s-rx-%u", netdev->name,
q_vector->rx.ring->queue_index);
else
sprintf(q_vector->name, "%s-unused", netdev->name);
err = request_irq(adapter->msix_entries[vector].vector,
igc_msix_ring, 0, q_vector->name,
q_vector);
if (err)
goto err_free;
}
igc_configure_msix(adapter);
return 0;
err_free:
/* free already assigned IRQs */
free_irq(adapter->msix_entries[free_vector++].vector, adapter);
vector--;
for (i = 0; i < vector; i++) {
free_irq(adapter->msix_entries[free_vector++].vector,
adapter->q_vector[i]);
}
err_out:
return err;
}
/**
* igc_reset_q_vector - Reset config for interrupt vector
* @adapter: board private structure to initialize
* @v_idx: Index of vector to be reset
*
* If NAPI is enabled it will delete any references to the
* NAPI struct. This is preparation for igc_free_q_vector.
*/
static void igc_reset_q_vector(struct igc_adapter *adapter, int v_idx)
{
struct igc_q_vector *q_vector = adapter->q_vector[v_idx];
/* if we're coming from igc_set_interrupt_capability, the vectors are
* not yet allocated
*/
if (!q_vector)
return;
if (q_vector->tx.ring)
adapter->tx_ring[q_vector->tx.ring->queue_index] = NULL;
if (q_vector->rx.ring)
adapter->rx_ring[q_vector->rx.ring->queue_index] = NULL;
netif_napi_del(&q_vector->napi);
}
static void igc_reset_interrupt_capability(struct igc_adapter *adapter)
{
int v_idx = adapter->num_q_vectors;
if (adapter->msix_entries) {
pci_disable_msix(adapter->pdev);
kfree(adapter->msix_entries);
adapter->msix_entries = NULL;
} else if (adapter->flags & IGC_FLAG_HAS_MSI) {
pci_disable_msi(adapter->pdev);
}
while (v_idx--)
igc_reset_q_vector(adapter, v_idx);
}
/**
* igc_clear_interrupt_scheme - reset the device to a state of no interrupts
* @adapter: Pointer to adapter structure
*
* This function resets the device so that it has 0 rx queues, tx queues, and
* MSI-X interrupts allocated.
*/
static void igc_clear_interrupt_scheme(struct igc_adapter *adapter)
{
igc_free_q_vectors(adapter);
igc_reset_interrupt_capability(adapter);
}
/**
* igc_free_q_vectors - Free memory allocated for interrupt vectors
* @adapter: board private structure to initialize
*
* This function frees the memory allocated to the q_vectors. In addition if
* NAPI is enabled it will delete any references to the NAPI struct prior
* to freeing the q_vector.
*/
static void igc_free_q_vectors(struct igc_adapter *adapter)
{
int v_idx = adapter->num_q_vectors;
adapter->num_tx_queues = 0;
adapter->num_rx_queues = 0;
adapter->num_q_vectors = 0;
while (v_idx--) {
igc_reset_q_vector(adapter, v_idx);
igc_free_q_vector(adapter, v_idx);
}
}
/**
* igc_free_q_vector - Free memory allocated for specific interrupt vector
* @adapter: board private structure to initialize
* @v_idx: Index of vector to be freed
*
* This function frees the memory allocated to the q_vector.
*/
static void igc_free_q_vector(struct igc_adapter *adapter, int v_idx)
{
struct igc_q_vector *q_vector = adapter->q_vector[v_idx];
adapter->q_vector[v_idx] = NULL;
/* igc_get_stats64() might access the rings on this vector,
* we must wait a grace period before freeing it.
*/
if (q_vector)
kfree_rcu(q_vector, rcu);
}
/* Need to wait a few seconds after link up to get diagnostic information from
* the phy
*/
static void igc_update_phy_info(struct timer_list *t)
{
struct igc_adapter *adapter = from_timer(adapter, t, phy_info_timer);
igc_get_phy_info(&adapter->hw);
}
/**
* igc_has_link - check shared code for link and determine up/down
* @adapter: pointer to driver private info
*/
static bool igc_has_link(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
bool link_active = false;
/* get_link_status is set on LSC (link status) interrupt or
* rx sequence error interrupt. get_link_status will stay
* false until the igc_check_for_link establishes link
* for copper adapters ONLY
*/
switch (hw->phy.media_type) {
case igc_media_type_copper:
if (!hw->mac.get_link_status)
return true;
hw->mac.ops.check_for_link(hw);
link_active = !hw->mac.get_link_status;
break;
default:
case igc_media_type_unknown:
break;
}
if (hw->mac.type == igc_i225 &&
hw->phy.id == I225_I_PHY_ID) {
if (!netif_carrier_ok(adapter->netdev)) {
adapter->flags &= ~IGC_FLAG_NEED_LINK_UPDATE;
} else if (!(adapter->flags & IGC_FLAG_NEED_LINK_UPDATE)) {
adapter->flags |= IGC_FLAG_NEED_LINK_UPDATE;
adapter->link_check_timeout = jiffies;
}
}
return link_active;
}
/**
* igc_watchdog - Timer Call-back
* @data: pointer to adapter cast into an unsigned long
*/
static void igc_watchdog(struct timer_list *t)
{
struct igc_adapter *adapter = from_timer(adapter, t, watchdog_timer);
/* Do the rest outside of interrupt context */
schedule_work(&adapter->watchdog_task);
}
static void igc_watchdog_task(struct work_struct *work)
{
struct igc_adapter *adapter = container_of(work,
struct igc_adapter,
watchdog_task);
struct net_device *netdev = adapter->netdev;
struct igc_hw *hw = &adapter->hw;
struct igc_phy_info *phy = &hw->phy;
u16 phy_data, retry_count = 20;
u32 connsw;
u32 link;
int i;
link = igc_has_link(adapter);
if (adapter->flags & IGC_FLAG_NEED_LINK_UPDATE) {
if (time_after(jiffies, (adapter->link_check_timeout + HZ)))
adapter->flags &= ~IGC_FLAG_NEED_LINK_UPDATE;
else
link = false;
}
/* Force link down if we have fiber to swap to */
if (adapter->flags & IGC_FLAG_MAS_ENABLE) {
if (hw->phy.media_type == igc_media_type_copper) {
connsw = rd32(IGC_CONNSW);
if (!(connsw & IGC_CONNSW_AUTOSENSE_EN))
link = 0;
}
}
if (link) {
if (!netif_carrier_ok(netdev)) {
u32 ctrl;
hw->mac.ops.get_speed_and_duplex(hw,
&adapter->link_speed,
&adapter->link_duplex);
ctrl = rd32(IGC_CTRL);
/* Link status message must follow this format */
netdev_info(netdev,
"igc: %s NIC Link is Up %d Mbps %s Duplex, Flow Control: %s\n",
netdev->name,
adapter->link_speed,
adapter->link_duplex == FULL_DUPLEX ?
"Full" : "Half",
(ctrl & IGC_CTRL_TFCE) &&
(ctrl & IGC_CTRL_RFCE) ? "RX/TX" :
(ctrl & IGC_CTRL_RFCE) ? "RX" :
(ctrl & IGC_CTRL_TFCE) ? "TX" : "None");
/* check if SmartSpeed worked */
igc_check_downshift(hw);
if (phy->speed_downgraded)
netdev_warn(netdev, "Link Speed was downgraded by SmartSpeed\n");
/* adjust timeout factor according to speed/duplex */
adapter->tx_timeout_factor = 1;
switch (adapter->link_speed) {
case SPEED_10:
adapter->tx_timeout_factor = 14;
break;
case SPEED_100:
/* maybe add some timeout factor ? */
break;
}
if (adapter->link_speed != SPEED_1000)
goto no_wait;
/* wait for Remote receiver status OK */
retry_read_status:
if (!igc_read_phy_reg(hw, PHY_1000T_STATUS,
&phy_data)) {
if (!(phy_data & SR_1000T_REMOTE_RX_STATUS) &&
retry_count) {
msleep(100);
retry_count--;
goto retry_read_status;
} else if (!retry_count) {
dev_err(&adapter->pdev->dev, "exceed max 2 second\n");
}
} else {
dev_err(&adapter->pdev->dev, "read 1000Base-T Status Reg\n");
}
no_wait:
netif_carrier_on(netdev);
/* link state has changed, schedule phy info update */
if (!test_bit(__IGC_DOWN, &adapter->state))
mod_timer(&adapter->phy_info_timer,
round_jiffies(jiffies + 2 * HZ));
}
} else {
if (netif_carrier_ok(netdev)) {
adapter->link_speed = 0;
adapter->link_duplex = 0;
/* Links status message must follow this format */
netdev_info(netdev, "igc: %s NIC Link is Down\n",
netdev->name);
netif_carrier_off(netdev);
/* link state has changed, schedule phy info update */
if (!test_bit(__IGC_DOWN, &adapter->state))
mod_timer(&adapter->phy_info_timer,
round_jiffies(jiffies + 2 * HZ));
/* link is down, time to check for alternate media */
if (adapter->flags & IGC_FLAG_MAS_ENABLE) {
if (adapter->flags & IGC_FLAG_MEDIA_RESET) {
schedule_work(&adapter->reset_task);
/* return immediately */
return;
}
}
/* also check for alternate media here */
} else if (!netif_carrier_ok(netdev) &&
(adapter->flags & IGC_FLAG_MAS_ENABLE)) {
if (adapter->flags & IGC_FLAG_MEDIA_RESET) {
schedule_work(&adapter->reset_task);
/* return immediately */
return;
}
}
}
spin_lock(&adapter->stats64_lock);
igc_update_stats(adapter);
spin_unlock(&adapter->stats64_lock);
for (i = 0; i < adapter->num_tx_queues; i++) {
struct igc_ring *tx_ring = adapter->tx_ring[i];
if (!netif_carrier_ok(netdev)) {
/* 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).
*/
if (igc_desc_unused(tx_ring) + 1 < tx_ring->count) {
adapter->tx_timeout_count++;
schedule_work(&adapter->reset_task);
/* return immediately since reset is imminent */
return;
}
}
/* Force detection of hung controller every watchdog period */
set_bit(IGC_RING_FLAG_TX_DETECT_HANG, &tx_ring->flags);
}
/* Cause software interrupt to ensure Rx ring is cleaned */
if (adapter->flags & IGC_FLAG_HAS_MSIX) {
u32 eics = 0;
for (i = 0; i < adapter->num_q_vectors; i++)
eics |= adapter->q_vector[i]->eims_value;
wr32(IGC_EICS, eics);
} else {
wr32(IGC_ICS, IGC_ICS_RXDMT0);
}
/* Reset the timer */
if (!test_bit(__IGC_DOWN, &adapter->state)) {
if (adapter->flags & IGC_FLAG_NEED_LINK_UPDATE)
mod_timer(&adapter->watchdog_timer,
round_jiffies(jiffies + HZ));
else
mod_timer(&adapter->watchdog_timer,
round_jiffies(jiffies + 2 * HZ));
}
}
/**
* igc_update_ring_itr - update the dynamic ITR value based on packet size
* @q_vector: pointer to q_vector
*
* Stores a new ITR value based on strictly on packet size. This
* algorithm is less sophisticated than that used in igc_update_itr,
* due to the difficulty of synchronizing statistics across multiple
* receive rings. The divisors and thresholds used by this function
* were determined based on theoretical maximum wire speed and testing
* data, in order to minimize response time while increasing bulk
* throughput.
* NOTE: This function is called only when operating in a multiqueue
* receive environment.
*/
static void igc_update_ring_itr(struct igc_q_vector *q_vector)
{
struct igc_adapter *adapter = q_vector->adapter;
int new_val = q_vector->itr_val;
int avg_wire_size = 0;
unsigned int packets;
/* For non-gigabit speeds, just fix the interrupt rate at 4000
* ints/sec - ITR timer value of 120 ticks.
*/
switch (adapter->link_speed) {
case SPEED_10:
case SPEED_100:
new_val = IGC_4K_ITR;
goto set_itr_val;
default:
break;
}
packets = q_vector->rx.total_packets;
if (packets)
avg_wire_size = q_vector->rx.total_bytes / packets;
packets = q_vector->tx.total_packets;
if (packets)
avg_wire_size = max_t(u32, avg_wire_size,
q_vector->tx.total_bytes / packets);
/* if avg_wire_size isn't set no work was done */
if (!avg_wire_size)
goto clear_counts;
/* Add 24 bytes to size to account for CRC, preamble, and gap */
avg_wire_size += 24;
/* Don't starve jumbo frames */
avg_wire_size = min(avg_wire_size, 3000);
/* Give a little boost to mid-size frames */
if (avg_wire_size > 300 && avg_wire_size < 1200)
new_val = avg_wire_size / 3;
else
new_val = avg_wire_size / 2;
/* conservative mode (itr 3) eliminates the lowest_latency setting */
if (new_val < IGC_20K_ITR &&
((q_vector->rx.ring && adapter->rx_itr_setting == 3) ||
(!q_vector->rx.ring && adapter->tx_itr_setting == 3)))
new_val = IGC_20K_ITR;
set_itr_val:
if (new_val != q_vector->itr_val) {
q_vector->itr_val = new_val;
q_vector->set_itr = 1;
}
clear_counts:
q_vector->rx.total_bytes = 0;
q_vector->rx.total_packets = 0;
q_vector->tx.total_bytes = 0;
q_vector->tx.total_packets = 0;
}
/**
* igc_update_itr - update the dynamic ITR value based on statistics
* @q_vector: pointer to q_vector
* @ring_container: ring info to update the itr for
*
* Stores a new ITR value based on packets and byte
* counts during the last interrupt. The advantage of per interrupt
* computation is faster updates and more accurate ITR for the current
* traffic pattern. Constants in this function were computed
* based on theoretical maximum wire speed and thresholds were set based
* on testing data as well as attempting to minimize response time
* while increasing bulk throughput.
* NOTE: These calculations are only valid when operating in a single-
* queue environment.
*/
static void igc_update_itr(struct igc_q_vector *q_vector,
struct igc_ring_container *ring_container)
{
unsigned int packets = ring_container->total_packets;
unsigned int bytes = ring_container->total_bytes;
u8 itrval = ring_container->itr;
/* no packets, exit with status unchanged */
if (packets == 0)
return;
switch (itrval) {
case lowest_latency:
/* handle TSO and jumbo frames */
if (bytes / packets > 8000)
itrval = bulk_latency;
else if ((packets < 5) && (bytes > 512))
itrval = low_latency;
break;
case low_latency: /* 50 usec aka 20000 ints/s */
if (bytes > 10000) {
/* this if handles the TSO accounting */
if (bytes / packets > 8000)
itrval = bulk_latency;
else if ((packets < 10) || ((bytes / packets) > 1200))
itrval = bulk_latency;
else if ((packets > 35))
itrval = lowest_latency;
} else if (bytes / packets > 2000) {
itrval = bulk_latency;
} else if (packets <= 2 && bytes < 512) {
itrval = lowest_latency;
}
break;
case bulk_latency: /* 250 usec aka 4000 ints/s */
if (bytes > 25000) {
if (packets > 35)
itrval = low_latency;
} else if (bytes < 1500) {
itrval = low_latency;
}
break;
}
/* clear work counters since we have the values we need */
ring_container->total_bytes = 0;
ring_container->total_packets = 0;
/* write updated itr to ring container */
ring_container->itr = itrval;
}
/**
* igc_intr_msi - Interrupt Handler
* @irq: interrupt number
* @data: pointer to a network interface device structure
*/
static irqreturn_t igc_intr_msi(int irq, void *data)
{
struct igc_adapter *adapter = data;
struct igc_q_vector *q_vector = adapter->q_vector[0];
struct igc_hw *hw = &adapter->hw;
/* read ICR disables interrupts using IAM */
u32 icr = rd32(IGC_ICR);
igc_write_itr(q_vector);
if (icr & IGC_ICR_DRSTA)
schedule_work(&adapter->reset_task);
if (icr & IGC_ICR_DOUTSYNC) {
/* HW is reporting DMA is out of sync */
adapter->stats.doosync++;
}
if (icr & (IGC_ICR_RXSEQ | IGC_ICR_LSC)) {
hw->mac.get_link_status = 1;
if (!test_bit(__IGC_DOWN, &adapter->state))
mod_timer(&adapter->watchdog_timer, jiffies + 1);
}
napi_schedule(&q_vector->napi);
return IRQ_HANDLED;
}
/**
* igc_intr - Legacy Interrupt Handler
* @irq: interrupt number
* @data: pointer to a network interface device structure
*/
static irqreturn_t igc_intr(int irq, void *data)
{
struct igc_adapter *adapter = data;
struct igc_q_vector *q_vector = adapter->q_vector[0];
struct igc_hw *hw = &adapter->hw;
/* Interrupt Auto-Mask...upon reading ICR, interrupts are masked. No
* need for the IMC write
*/
u32 icr = rd32(IGC_ICR);
/* IMS will not auto-mask if INT_ASSERTED is not set, and if it is
* not set, then the adapter didn't send an interrupt
*/
if (!(icr & IGC_ICR_INT_ASSERTED))
return IRQ_NONE;
igc_write_itr(q_vector);
if (icr & IGC_ICR_DRSTA)
schedule_work(&adapter->reset_task);
if (icr & IGC_ICR_DOUTSYNC) {
/* HW is reporting DMA is out of sync */
adapter->stats.doosync++;
}
if (icr & (IGC_ICR_RXSEQ | IGC_ICR_LSC)) {
hw->mac.get_link_status = 1;
/* guard against interrupt when we're going down */
if (!test_bit(__IGC_DOWN, &adapter->state))
mod_timer(&adapter->watchdog_timer, jiffies + 1);
}
napi_schedule(&q_vector->napi);
return IRQ_HANDLED;
}
static void igc_set_itr(struct igc_q_vector *q_vector)
{
struct igc_adapter *adapter = q_vector->adapter;
u32 new_itr = q_vector->itr_val;
u8 current_itr = 0;
/* for non-gigabit speeds, just fix the interrupt rate at 4000 */
switch (adapter->link_speed) {
case SPEED_10:
case SPEED_100:
current_itr = 0;
new_itr = IGC_4K_ITR;
goto set_itr_now;
default:
break;
}
igc_update_itr(q_vector, &q_vector->tx);
igc_update_itr(q_vector, &q_vector->rx);
current_itr = max(q_vector->rx.itr, q_vector->tx.itr);
/* conservative mode (itr 3) eliminates the lowest_latency setting */
if (current_itr == lowest_latency &&
((q_vector->rx.ring && adapter->rx_itr_setting == 3) ||
(!q_vector->rx.ring && adapter->tx_itr_setting == 3)))
current_itr = low_latency;
switch (current_itr) {
/* counts and packets in update_itr are dependent on these numbers */
case lowest_latency:
new_itr = IGC_70K_ITR; /* 70,000 ints/sec */
break;
case low_latency:
new_itr = IGC_20K_ITR; /* 20,000 ints/sec */
break;
case bulk_latency:
new_itr = IGC_4K_ITR; /* 4,000 ints/sec */
break;
default:
break;
}
set_itr_now:
if (new_itr != q_vector->itr_val) {
/* this attempts to bias the interrupt rate towards Bulk
* by adding intermediate steps when interrupt rate is
* increasing
*/
new_itr = new_itr > q_vector->itr_val ?
max((new_itr * q_vector->itr_val) /
(new_itr + (q_vector->itr_val >> 2)),
new_itr) : new_itr;
/* Don't write the value here; it resets the adapter's
* internal timer, and causes us to delay far longer than
* we should between interrupts. Instead, we write the ITR
* value at the beginning of the next interrupt so the timing
* ends up being correct.
*/
q_vector->itr_val = new_itr;
q_vector->set_itr = 1;
}
}
static void igc_ring_irq_enable(struct igc_q_vector *q_vector)
{
struct igc_adapter *adapter = q_vector->adapter;
struct igc_hw *hw = &adapter->hw;
if ((q_vector->rx.ring && (adapter->rx_itr_setting & 3)) ||
(!q_vector->rx.ring && (adapter->tx_itr_setting & 3))) {
if (adapter->num_q_vectors == 1)
igc_set_itr(q_vector);
else
igc_update_ring_itr(q_vector);
}
if (!test_bit(__IGC_DOWN, &adapter->state)) {
if (adapter->msix_entries)
wr32(IGC_EIMS, q_vector->eims_value);
else
igc_irq_enable(adapter);
}
}
/**
* igc_poll - NAPI Rx polling callback
* @napi: napi polling structure
* @budget: count of how many packets we should handle
*/
static int igc_poll(struct napi_struct *napi, int budget)
{
struct igc_q_vector *q_vector = container_of(napi,
struct igc_q_vector,
napi);
bool clean_complete = true;
int work_done = 0;
if (q_vector->tx.ring)
clean_complete = igc_clean_tx_irq(q_vector, budget);
if (q_vector->rx.ring) {
int cleaned = igc_clean_rx_irq(q_vector, budget);
work_done += cleaned;
if (cleaned >= budget)
clean_complete = false;
}
/* If all work not completed, return budget and keep polling */
if (!clean_complete)
return budget;
/* If not enough Rx work done, exit the polling mode */
napi_complete_done(napi, work_done);
igc_ring_irq_enable(q_vector);
return 0;
}
/**
* igc_set_interrupt_capability - set MSI or MSI-X if supported
* @adapter: Pointer to adapter structure
*
* Attempt to configure interrupts using the best available
* capabilities of the hardware and kernel.
*/
static void igc_set_interrupt_capability(struct igc_adapter *adapter,
bool msix)
{
int numvecs, i;
int err;
if (!msix)
goto msi_only;
adapter->flags |= IGC_FLAG_HAS_MSIX;
/* Number of supported queues. */
adapter->num_rx_queues = adapter->rss_queues;
adapter->num_tx_queues = adapter->rss_queues;
/* start with one vector for every Rx queue */
numvecs = adapter->num_rx_queues;
/* if Tx handler is separate add 1 for every Tx queue */
if (!(adapter->flags & IGC_FLAG_QUEUE_PAIRS))
numvecs += adapter->num_tx_queues;
/* store the number of vectors reserved for queues */
adapter->num_q_vectors = numvecs;
/* add 1 vector for link status interrupts */
numvecs++;
adapter->msix_entries = kcalloc(numvecs, sizeof(struct msix_entry),
GFP_KERNEL);
if (!adapter->msix_entries)
return;
/* populate entry values */
for (i = 0; i < numvecs; i++)
adapter->msix_entries[i].entry = i;
err = pci_enable_msix_range(adapter->pdev,
adapter->msix_entries,
numvecs,
numvecs);
if (err > 0)
return;
kfree(adapter->msix_entries);
adapter->msix_entries = NULL;
igc_reset_interrupt_capability(adapter);
msi_only:
adapter->flags &= ~IGC_FLAG_HAS_MSIX;
adapter->rss_queues = 1;
adapter->flags |= IGC_FLAG_QUEUE_PAIRS;
adapter->num_rx_queues = 1;
adapter->num_tx_queues = 1;
adapter->num_q_vectors = 1;
if (!pci_enable_msi(adapter->pdev))
adapter->flags |= IGC_FLAG_HAS_MSI;
}
static void igc_add_ring(struct igc_ring *ring,
struct igc_ring_container *head)
{
head->ring = ring;
head->count++;
}
/**
* igc_alloc_q_vector - Allocate memory for a single interrupt vector
* @adapter: board private structure to initialize
* @v_count: q_vectors allocated on adapter, used for ring interleaving
* @v_idx: index of vector in adapter struct
* @txr_count: total number of Tx rings to allocate
* @txr_idx: index of first Tx ring to allocate
* @rxr_count: total number of Rx rings to allocate
* @rxr_idx: index of first Rx ring to allocate
*
* We allocate one q_vector. If allocation fails we return -ENOMEM.
*/
static int igc_alloc_q_vector(struct igc_adapter *adapter,
unsigned int v_count, unsigned int v_idx,
unsigned int txr_count, unsigned int txr_idx,
unsigned int rxr_count, unsigned int rxr_idx)
{
struct igc_q_vector *q_vector;
struct igc_ring *ring;
int ring_count, size;
/* igc only supports 1 Tx and/or 1 Rx queue per vector */
if (txr_count > 1 || rxr_count > 1)
return -ENOMEM;
ring_count = txr_count + rxr_count;
size = sizeof(struct igc_q_vector) +
(sizeof(struct igc_ring) * ring_count);
/* allocate q_vector and rings */
q_vector = adapter->q_vector[v_idx];
if (!q_vector)
q_vector = kzalloc(size, GFP_KERNEL);
else
memset(q_vector, 0, size);
if (!q_vector)
return -ENOMEM;
/* initialize NAPI */
netif_napi_add(adapter->netdev, &q_vector->napi,
igc_poll, 64);
/* tie q_vector and adapter together */
adapter->q_vector[v_idx] = q_vector;
q_vector->adapter = adapter;
/* initialize work limits */
q_vector->tx.work_limit = adapter->tx_work_limit;
/* initialize ITR configuration */
q_vector->itr_register = adapter->io_addr + IGC_EITR(0);
q_vector->itr_val = IGC_START_ITR;
/* initialize pointer to rings */
ring = q_vector->ring;
/* initialize ITR */
if (rxr_count) {
/* rx or rx/tx vector */
if (!adapter->rx_itr_setting || adapter->rx_itr_setting > 3)
q_vector->itr_val = adapter->rx_itr_setting;
} else {
/* tx only vector */
if (!adapter->tx_itr_setting || adapter->tx_itr_setting > 3)
q_vector->itr_val = adapter->tx_itr_setting;
}
if (txr_count) {
/* assign generic ring traits */
ring->dev = &adapter->pdev->dev;
ring->netdev = adapter->netdev;
/* configure backlink on ring */
ring->q_vector = q_vector;
/* update q_vector Tx values */
igc_add_ring(ring, &q_vector->tx);
/* apply Tx specific ring traits */
ring->count = adapter->tx_ring_count;
ring->queue_index = txr_idx;
/* assign ring to adapter */
adapter->tx_ring[txr_idx] = ring;
/* push pointer to next ring */
ring++;
}
if (rxr_count) {
/* assign generic ring traits */
ring->dev = &adapter->pdev->dev;
ring->netdev = adapter->netdev;
/* configure backlink on ring */
ring->q_vector = q_vector;
/* update q_vector Rx values */
igc_add_ring(ring, &q_vector->rx);
/* apply Rx specific ring traits */
ring->count = adapter->rx_ring_count;
ring->queue_index = rxr_idx;
/* assign ring to adapter */
adapter->rx_ring[rxr_idx] = ring;
}
return 0;
}
/**
* igc_alloc_q_vectors - Allocate memory for interrupt vectors
* @adapter: board private structure to initialize
*
* We allocate one q_vector per queue interrupt. If allocation fails we
* return -ENOMEM.
*/
static int igc_alloc_q_vectors(struct igc_adapter *adapter)
{
int rxr_remaining = adapter->num_rx_queues;
int txr_remaining = adapter->num_tx_queues;
int rxr_idx = 0, txr_idx = 0, v_idx = 0;
int q_vectors = adapter->num_q_vectors;
int err;
if (q_vectors >= (rxr_remaining + txr_remaining)) {
for (; rxr_remaining; v_idx++) {
err = igc_alloc_q_vector(adapter, q_vectors, v_idx,
0, 0, 1, rxr_idx);
if (err)
goto err_out;
/* update counts and index */
rxr_remaining--;
rxr_idx++;
}
}
for (; v_idx < q_vectors; v_idx++) {
int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - v_idx);
int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - v_idx);
err = igc_alloc_q_vector(adapter, q_vectors, v_idx,
tqpv, txr_idx, rqpv, rxr_idx);
if (err)
goto err_out;
/* update counts and index */
rxr_remaining -= rqpv;
txr_remaining -= tqpv;
rxr_idx++;
txr_idx++;
}
return 0;
err_out:
adapter->num_tx_queues = 0;
adapter->num_rx_queues = 0;
adapter->num_q_vectors = 0;
while (v_idx--)
igc_free_q_vector(adapter, v_idx);
return -ENOMEM;
}
/**
* igc_cache_ring_register - Descriptor ring to register mapping
* @adapter: board private structure to initialize
*
* Once we know the feature-set enabled for the device, we'll cache
* the register offset the descriptor ring is assigned to.
*/
static void igc_cache_ring_register(struct igc_adapter *adapter)
{
int i = 0, j = 0;
switch (adapter->hw.mac.type) {
case igc_i225:
/* Fall through */
default:
for (; i < adapter->num_rx_queues; i++)
adapter->rx_ring[i]->reg_idx = i;
for (; j < adapter->num_tx_queues; j++)
adapter->tx_ring[j]->reg_idx = j;
break;
}
}
/**
* igc_init_interrupt_scheme - initialize interrupts, allocate queues/vectors
* @adapter: Pointer to adapter structure
*
* This function initializes the interrupts and allocates all of the queues.
*/
static int igc_init_interrupt_scheme(struct igc_adapter *adapter, bool msix)
{
struct pci_dev *pdev = adapter->pdev;
int err = 0;
igc_set_interrupt_capability(adapter, msix);
err = igc_alloc_q_vectors(adapter);
if (err) {
dev_err(&pdev->dev, "Unable to allocate memory for vectors\n");
goto err_alloc_q_vectors;
}
igc_cache_ring_register(adapter);
return 0;
err_alloc_q_vectors:
igc_reset_interrupt_capability(adapter);
return err;
}
static void igc_free_irq(struct igc_adapter *adapter)
{
if (adapter->msix_entries) {
int vector = 0, i;
free_irq(adapter->msix_entries[vector++].vector, adapter);
for (i = 0; i < adapter->num_q_vectors; i++)
free_irq(adapter->msix_entries[vector++].vector,
adapter->q_vector[i]);
} else {
free_irq(adapter->pdev->irq, adapter);
}
}
/**
* igc_irq_disable - Mask off interrupt generation on the NIC
* @adapter: board private structure
*/
static void igc_irq_disable(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
if (adapter->msix_entries) {
u32 regval = rd32(IGC_EIAM);
wr32(IGC_EIAM, regval & ~adapter->eims_enable_mask);
wr32(IGC_EIMC, adapter->eims_enable_mask);
regval = rd32(IGC_EIAC);
wr32(IGC_EIAC, regval & ~adapter->eims_enable_mask);
}
wr32(IGC_IAM, 0);
wr32(IGC_IMC, ~0);
wrfl();
if (adapter->msix_entries) {
int vector = 0, i;
synchronize_irq(adapter->msix_entries[vector++].vector);
for (i = 0; i < adapter->num_q_vectors; i++)
synchronize_irq(adapter->msix_entries[vector++].vector);
} else {
synchronize_irq(adapter->pdev->irq);
}
}
/**
* igc_irq_enable - Enable default interrupt generation settings
* @adapter: board private structure
*/
static void igc_irq_enable(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
if (adapter->msix_entries) {
u32 ims = IGC_IMS_LSC | IGC_IMS_DOUTSYNC | IGC_IMS_DRSTA;
u32 regval = rd32(IGC_EIAC);
wr32(IGC_EIAC, regval | adapter->eims_enable_mask);
regval = rd32(IGC_EIAM);
wr32(IGC_EIAM, regval | adapter->eims_enable_mask);
wr32(IGC_EIMS, adapter->eims_enable_mask);
wr32(IGC_IMS, ims);
} else {
wr32(IGC_IMS, IMS_ENABLE_MASK | IGC_IMS_DRSTA);
wr32(IGC_IAM, IMS_ENABLE_MASK | IGC_IMS_DRSTA);
}
}
/**
* igc_request_irq - initialize interrupts
* @adapter: Pointer to adapter structure
*
* Attempts to configure interrupts using the best available
* capabilities of the hardware and kernel.
*/
static int igc_request_irq(struct igc_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
int err = 0;
if (adapter->flags & IGC_FLAG_HAS_MSIX) {
err = igc_request_msix(adapter);
if (!err)
goto request_done;
/* fall back to MSI */
igc_free_all_tx_resources(adapter);
igc_free_all_rx_resources(adapter);
igc_clear_interrupt_scheme(adapter);
err = igc_init_interrupt_scheme(adapter, false);
if (err)
goto request_done;
igc_setup_all_tx_resources(adapter);
igc_setup_all_rx_resources(adapter);
igc_configure(adapter);
}
igc_assign_vector(adapter->q_vector[0], 0);
if (adapter->flags & IGC_FLAG_HAS_MSI) {
err = request_irq(pdev->irq, &igc_intr_msi, 0,
netdev->name, adapter);
if (!err)
goto request_done;
/* fall back to legacy interrupts */
igc_reset_interrupt_capability(adapter);
adapter->flags &= ~IGC_FLAG_HAS_MSI;
}
err = request_irq(pdev->irq, &igc_intr, IRQF_SHARED,
netdev->name, adapter);
if (err)
dev_err(&pdev->dev, "Error %d getting interrupt\n",
err);
request_done:
return err;
}
static void igc_write_itr(struct igc_q_vector *q_vector)
{
u32 itr_val = q_vector->itr_val & IGC_QVECTOR_MASK;
if (!q_vector->set_itr)
return;
if (!itr_val)
itr_val = IGC_ITR_VAL_MASK;
itr_val |= IGC_EITR_CNT_IGNR;
writel(itr_val, q_vector->itr_register);
q_vector->set_itr = 0;
}
/**
* igc_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 __igc_open(struct net_device *netdev, bool resuming)
{
struct igc_adapter *adapter = netdev_priv(netdev);
struct igc_hw *hw = &adapter->hw;
int err = 0;
int i = 0;
/* disallow open during test */
if (test_bit(__IGC_TESTING, &adapter->state)) {
WARN_ON(resuming);
return -EBUSY;
}
netif_carrier_off(netdev);
/* allocate transmit descriptors */
err = igc_setup_all_tx_resources(adapter);
if (err)
goto err_setup_tx;
/* allocate receive descriptors */
err = igc_setup_all_rx_resources(adapter);
if (err)
goto err_setup_rx;
igc_power_up_link(adapter);
igc_configure(adapter);
err = igc_request_irq(adapter);
if (err)
goto err_req_irq;
/* Notify the stack of the actual queue counts. */
netif_set_real_num_tx_queues(netdev, adapter->num_tx_queues);
if (err)
goto err_set_queues;
err = netif_set_real_num_rx_queues(netdev, adapter->num_rx_queues);
if (err)
goto err_set_queues;
clear_bit(__IGC_DOWN, &adapter->state);
for (i = 0; i < adapter->num_q_vectors; i++)
napi_enable(&adapter->q_vector[i]->napi);
/* Clear any pending interrupts. */
rd32(IGC_ICR);
igc_irq_enable(adapter);
netif_tx_start_all_queues(netdev);
/* start the watchdog. */
hw->mac.get_link_status = 1;
schedule_work(&adapter->watchdog_task);
return IGC_SUCCESS;
err_set_queues:
igc_free_irq(adapter);
err_req_irq:
igc_release_hw_control(adapter);
igc_power_down_link(adapter);
igc_free_all_rx_resources(adapter);
err_setup_rx:
igc_free_all_tx_resources(adapter);
err_setup_tx:
igc_reset(adapter);
return err;
}
static int igc_open(struct net_device *netdev)
{
return __igc_open(netdev, false);
}
/**
* igc_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 driver's 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 __igc_close(struct net_device *netdev, bool suspending)
{
struct igc_adapter *adapter = netdev_priv(netdev);
WARN_ON(test_bit(__IGC_RESETTING, &adapter->state));
igc_down(adapter);
igc_release_hw_control(adapter);
igc_free_irq(adapter);
igc_free_all_tx_resources(adapter);
igc_free_all_rx_resources(adapter);
return 0;
}
static int igc_close(struct net_device *netdev)
{
if (netif_device_present(netdev) || netdev->dismantle)
return __igc_close(netdev, false);
return 0;
}
static const struct net_device_ops igc_netdev_ops = {
.ndo_open = igc_open,
.ndo_stop = igc_close,
.ndo_start_xmit = igc_xmit_frame,
.ndo_set_mac_address = igc_set_mac,
.ndo_change_mtu = igc_change_mtu,
.ndo_get_stats = igc_get_stats,
.ndo_do_ioctl = igc_ioctl,
};
/* PCIe configuration access */
void igc_read_pci_cfg(struct igc_hw *hw, u32 reg, u16 *value)
{
struct igc_adapter *adapter = hw->back;
pci_read_config_word(adapter->pdev, reg, value);
}
void igc_write_pci_cfg(struct igc_hw *hw, u32 reg, u16 *value)
{
struct igc_adapter *adapter = hw->back;
pci_write_config_word(adapter->pdev, reg, *value);
}
s32 igc_read_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value)
{
struct igc_adapter *adapter = hw->back;
u16 cap_offset;
cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
if (!cap_offset)
return -IGC_ERR_CONFIG;
pci_read_config_word(adapter->pdev, cap_offset + reg, value);
return IGC_SUCCESS;
}
s32 igc_write_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value)
{
struct igc_adapter *adapter = hw->back;
u16 cap_offset;
cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
if (!cap_offset)
return -IGC_ERR_CONFIG;
pci_write_config_word(adapter->pdev, cap_offset + reg, *value);
return IGC_SUCCESS;
}
u32 igc_rd32(struct igc_hw *hw, u32 reg)
{
struct igc_adapter *igc = container_of(hw, struct igc_adapter, hw);
u8 __iomem *hw_addr = READ_ONCE(hw->hw_addr);
u32 value = 0;
if (IGC_REMOVED(hw_addr))
return ~value;
value = readl(&hw_addr[reg]);
/* reads should not return all F's */
if (!(~value) && (!reg || !(~readl(hw_addr)))) {
struct net_device *netdev = igc->netdev;
hw->hw_addr = NULL;
netif_device_detach(netdev);
netdev_err(netdev, "PCIe link lost, device now detached\n");
}
return value;
}
/**
* igc_probe - Device Initialization Routine
* @pdev: PCI device information struct
* @ent: entry in igc_pci_tbl
*
* Returns 0 on success, negative on failure
*
* igc_probe initializes an adapter identified by a pci_dev structure.
* The OS initialization, configuring the adapter private structure,
* and a hardware reset occur.
*/
static int igc_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct igc_adapter *adapter;
struct net_device *netdev;
struct igc_hw *hw;
const struct igc_info *ei = igc_info_tbl[ent->driver_data];
int err, pci_using_dac;
err = pci_enable_device_mem(pdev);
if (err)
return err;
pci_using_dac = 0;
err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
if (!err) {
err = dma_set_coherent_mask(&pdev->dev,
DMA_BIT_MASK(64));
if (!err)
pci_using_dac = 1;
} else {
err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
if (err) {
err = dma_set_coherent_mask(&pdev->dev,
DMA_BIT_MASK(32));
if (err) {
IGC_ERR("Wrong DMA configuration, aborting\n");
goto err_dma;
}
}
}
err = pci_request_selected_regions(pdev,
pci_select_bars(pdev,
IORESOURCE_MEM),
igc_driver_name);
if (err)
goto err_pci_reg;
pci_enable_pcie_error_reporting(pdev);
pci_set_master(pdev);
err = -ENOMEM;
netdev = alloc_etherdev_mq(sizeof(struct igc_adapter),
IGC_MAX_TX_QUEUES);
if (!netdev)
goto err_alloc_etherdev;
SET_NETDEV_DEV(netdev, &pdev->dev);
pci_set_drvdata(pdev, netdev);
adapter = netdev_priv(netdev);
adapter->netdev = netdev;
adapter->pdev = pdev;
hw = &adapter->hw;
hw->back = adapter;
adapter->port_num = hw->bus.func;
adapter->msg_enable = GENMASK(debug - 1, 0);
err = pci_save_state(pdev);
if (err)
goto err_ioremap;
err = -EIO;
adapter->io_addr = ioremap(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
if (!adapter->io_addr)
goto err_ioremap;
/* hw->hw_addr can be zeroed, so use adapter->io_addr for unmap */
hw->hw_addr = adapter->io_addr;
netdev->netdev_ops = &igc_netdev_ops;
netdev->watchdog_timeo = 5 * HZ;
netdev->mem_start = pci_resource_start(pdev, 0);
netdev->mem_end = pci_resource_end(pdev, 0);
/* PCI config space info */
hw->vendor_id = pdev->vendor;
hw->device_id = pdev->device;
hw->revision_id = pdev->revision;
hw->subsystem_vendor_id = pdev->subsystem_vendor;
hw->subsystem_device_id = pdev->subsystem_device;
/* Copy the default MAC and PHY function pointers */
memcpy(&hw->mac.ops, ei->mac_ops, sizeof(hw->mac.ops));
memcpy(&hw->phy.ops, ei->phy_ops, sizeof(hw->phy.ops));
/* Initialize skew-specific constants */
err = ei->get_invariants(hw);
if (err)
goto err_sw_init;
/* setup the private structure */
err = igc_sw_init(adapter);
if (err)
goto err_sw_init;
/* MTU range: 68 - 9216 */
netdev->min_mtu = ETH_MIN_MTU;
netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE;
/* before reading the NVM, reset the controller to put the device in a
* known good starting state
*/
hw->mac.ops.reset_hw(hw);
if (eth_platform_get_mac_address(&pdev->dev, hw->mac.addr)) {
/* copy the MAC address out of the NVM */
if (hw->mac.ops.read_mac_addr(hw))
dev_err(&pdev->dev, "NVM Read Error\n");
}
memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len);
if (!is_valid_ether_addr(netdev->dev_addr)) {
dev_err(&pdev->dev, "Invalid MAC Address\n");
err = -EIO;
goto err_eeprom;
}
/* configure RXPBSIZE and TXPBSIZE */
wr32(IGC_RXPBS, I225_RXPBSIZE_DEFAULT);
wr32(IGC_TXPBS, I225_TXPBSIZE_DEFAULT);
timer_setup(&adapter->watchdog_timer, igc_watchdog, 0);
timer_setup(&adapter->phy_info_timer, igc_update_phy_info, 0);
INIT_WORK(&adapter->reset_task, igc_reset_task);
INIT_WORK(&adapter->watchdog_task, igc_watchdog_task);
/* Initialize link properties that are user-changeable */
adapter->fc_autoneg = true;
hw->mac.autoneg = true;
hw->phy.autoneg_advertised = 0xaf;
hw->fc.requested_mode = igc_fc_default;
hw->fc.current_mode = igc_fc_default;
/* reset the hardware with the new settings */
igc_reset(adapter);
/* let the f/w know that the h/w is now under the control of the
* driver.
*/
igc_get_hw_control(adapter);
strncpy(netdev->name, "eth%d", IFNAMSIZ);
err = register_netdev(netdev);
if (err)
goto err_register;
/* carrier off reporting is important to ethtool even BEFORE open */
netif_carrier_off(netdev);
/* Check if Media Autosense is enabled */
adapter->ei = *ei;
/* print pcie link status and MAC address */
pcie_print_link_status(pdev);
netdev_info(netdev, "MAC: %pM\n", netdev->dev_addr);
return 0;
err_register:
igc_release_hw_control(adapter);
err_eeprom:
if (!igc_check_reset_block(hw))
igc_reset_phy(hw);
err_sw_init:
igc_clear_interrupt_scheme(adapter);
iounmap(adapter->io_addr);
err_ioremap:
free_netdev(netdev);
err_alloc_etherdev:
pci_release_selected_regions(pdev,
pci_select_bars(pdev, IORESOURCE_MEM));
err_pci_reg:
err_dma:
pci_disable_device(pdev);
return err;
}
/**
* igc_remove - Device Removal Routine
* @pdev: PCI device information struct
*
* igc_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device. This could be caused by a
* Hot-Plug event, or because the driver is going to be removed from
* memory.
*/
static void igc_remove(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct igc_adapter *adapter = netdev_priv(netdev);
set_bit(__IGC_DOWN, &adapter->state);
del_timer_sync(&adapter->watchdog_timer);
del_timer_sync(&adapter->phy_info_timer);
cancel_work_sync(&adapter->reset_task);
cancel_work_sync(&adapter->watchdog_task);
/* Release control of h/w to f/w. If f/w is AMT enabled, this
* would have already happened in close and is redundant.
*/
igc_release_hw_control(adapter);
unregister_netdev(netdev);
igc_clear_interrupt_scheme(adapter);
pci_iounmap(pdev, adapter->io_addr);
pci_release_mem_regions(pdev);
kfree(adapter->mac_table);
kfree(adapter->shadow_vfta);
free_netdev(netdev);
pci_disable_pcie_error_reporting(pdev);
pci_disable_device(pdev);
}
static struct pci_driver igc_driver = {
.name = igc_driver_name,
.id_table = igc_pci_tbl,
.probe = igc_probe,
.remove = igc_remove,
};
static void igc_set_flag_queue_pairs(struct igc_adapter *adapter,
const u32 max_rss_queues)
{
/* Determine if we need to pair queues. */
/* If rss_queues > half of max_rss_queues, pair the queues in
* order to conserve interrupts due to limited supply.
*/
if (adapter->rss_queues > (max_rss_queues / 2))
adapter->flags |= IGC_FLAG_QUEUE_PAIRS;
else
adapter->flags &= ~IGC_FLAG_QUEUE_PAIRS;
}
static unsigned int igc_get_max_rss_queues(struct igc_adapter *adapter)
{
unsigned int max_rss_queues;
/* Determine the maximum number of RSS queues supported. */
max_rss_queues = IGC_MAX_RX_QUEUES;
return max_rss_queues;
}
static void igc_init_queue_configuration(struct igc_adapter *adapter)
{
u32 max_rss_queues;
max_rss_queues = igc_get_max_rss_queues(adapter);
adapter->rss_queues = min_t(u32, max_rss_queues, num_online_cpus());
igc_set_flag_queue_pairs(adapter, max_rss_queues);
}
/**
* igc_sw_init - Initialize general software structures (struct igc_adapter)
* @adapter: board private structure to initialize
*
* igc_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 igc_sw_init(struct igc_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
struct igc_hw *hw = &adapter->hw;
int size = sizeof(struct igc_mac_addr) * hw->mac.rar_entry_count;
pci_read_config_word(pdev, PCI_COMMAND, &hw->bus.pci_cmd_word);
/* set default ring sizes */
adapter->tx_ring_count = IGC_DEFAULT_TXD;
adapter->rx_ring_count = IGC_DEFAULT_RXD;
/* set default ITR values */
adapter->rx_itr_setting = IGC_DEFAULT_ITR;
adapter->tx_itr_setting = IGC_DEFAULT_ITR;
/* set default work limits */
adapter->tx_work_limit = IGC_DEFAULT_TX_WORK;
/* adjust max frame to be at least the size of a standard frame */
adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN +
VLAN_HLEN;
adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
spin_lock_init(&adapter->nfc_lock);
spin_lock_init(&adapter->stats64_lock);
/* Assume MSI-X interrupts, will be checked during IRQ allocation */
adapter->flags |= IGC_FLAG_HAS_MSIX;
adapter->mac_table = kzalloc(size, GFP_ATOMIC);
if (!adapter->mac_table)
return -ENOMEM;
igc_init_queue_configuration(adapter);
/* This call may decrease the number of queues */
if (igc_init_interrupt_scheme(adapter, true)) {
dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
return -ENOMEM;
}
/* Explicitly disable IRQ since the NIC can be in any state. */
igc_irq_disable(adapter);
set_bit(__IGC_DOWN, &adapter->state);
return 0;
}
/**
* igc_get_hw_dev - return device
* @hw: pointer to hardware structure
*
* used by hardware layer to print debugging information
*/
struct net_device *igc_get_hw_dev(struct igc_hw *hw)
{
struct igc_adapter *adapter = hw->back;
return adapter->netdev;
}
/**
* igc_init_module - Driver Registration Routine
*
* igc_init_module is the first routine called when the driver is
* loaded. All it does is register with the PCI subsystem.
*/
static int __init igc_init_module(void)
{
int ret;
pr_info("%s - version %s\n",
igc_driver_string, igc_driver_version);
pr_info("%s\n", igc_copyright);
ret = pci_register_driver(&igc_driver);
return ret;
}
module_init(igc_init_module);
/**
* igc_exit_module - Driver Exit Cleanup Routine
*
* igc_exit_module is called just before the driver is removed
* from memory.
*/
static void __exit igc_exit_module(void)
{
pci_unregister_driver(&igc_driver);
}
module_exit(igc_exit_module);
/* igc_main.c */
