/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2005-2006 Fen Systems Ltd.
* Copyright 2006-2008 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include "net_driver.h"
#include "bitfield.h"
#include "efx.h"
#include "mac.h"
#include "gmii.h"
#include "spi.h"
#include "falcon.h"
#include "falcon_hwdefs.h"
#include "falcon_io.h"
#include "mdio_10g.h"
#include "phy.h"
#include "boards.h"
#include "workarounds.h"
/* Falcon hardware control.
* Falcon is the internal codename for the SFC4000 controller that is
* present in SFE400X evaluation boards
*/
/**
* struct falcon_nic_data - Falcon NIC state
* @next_buffer_table: First available buffer table id
* @pci_dev2: The secondary PCI device if present
*/
struct falcon_nic_data {
unsigned next_buffer_table;
struct pci_dev *pci_dev2;
};
/**************************************************************************
*
* Configurable values
*
**************************************************************************
*/
static int disable_dma_stats;
/* This is set to 16 for a good reason. In summary, if larger than
* 16, the descriptor cache holds more than a default socket
* buffer's worth of packets (for UDP we can only have at most one
* socket buffer's worth outstanding). This combined with the fact
* that we only get 1 TX event per descriptor cache means the NIC
* goes idle.
*/
#define TX_DC_ENTRIES 16
#define TX_DC_ENTRIES_ORDER 0
#define TX_DC_BASE 0x130000
#define RX_DC_ENTRIES 64
#define RX_DC_ENTRIES_ORDER 2
#define RX_DC_BASE 0x100000
/* RX FIFO XOFF watermark
*
* When the amount of the RX FIFO increases used increases past this
* watermark send XOFF. Only used if RX flow control is enabled (ethtool -A)
* This also has an effect on RX/TX arbitration
*/
static int rx_xoff_thresh_bytes = -1;
module_param(rx_xoff_thresh_bytes, int, 0644);
MODULE_PARM_DESC(rx_xoff_thresh_bytes, "RX fifo XOFF threshold");
/* RX FIFO XON watermark
*
* When the amount of the RX FIFO used decreases below this
* watermark send XON. Only used if TX flow control is enabled (ethtool -A)
* This also has an effect on RX/TX arbitration
*/
static int rx_xon_thresh_bytes = -1;
module_param(rx_xon_thresh_bytes, int, 0644);
MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold");
/* TX descriptor ring size - min 512 max 4k */
#define FALCON_TXD_RING_ORDER TX_DESCQ_SIZE_1K
#define FALCON_TXD_RING_SIZE 1024
#define FALCON_TXD_RING_MASK (FALCON_TXD_RING_SIZE - 1)
/* RX descriptor ring size - min 512 max 4k */
#define FALCON_RXD_RING_ORDER RX_DESCQ_SIZE_1K
#define FALCON_RXD_RING_SIZE 1024
#define FALCON_RXD_RING_MASK (FALCON_RXD_RING_SIZE - 1)
/* Event queue size - max 32k */
#define FALCON_EVQ_ORDER EVQ_SIZE_4K
#define FALCON_EVQ_SIZE 4096
#define FALCON_EVQ_MASK (FALCON_EVQ_SIZE - 1)
/* Max number of internal errors. After this resets will not be performed */
#define FALCON_MAX_INT_ERRORS 4
/* Maximum period that we wait for flush events. If the flush event
* doesn't arrive in this period of time then we check if the queue
* was disabled anyway. */
#define FALCON_FLUSH_TIMEOUT 10 /* 10ms */
/**************************************************************************
*
* Falcon constants
*
**************************************************************************
*/
/* DMA address mask */
#define FALCON_DMA_MASK DMA_BIT_MASK(46)
/* TX DMA length mask (13-bit) */
#define FALCON_TX_DMA_MASK (4096 - 1)
/* Size and alignment of special buffers (4KB) */
#define FALCON_BUF_SIZE 4096
/* Dummy SRAM size code */
#define SRM_NB_BSZ_ONCHIP_ONLY (-1)
/* Be nice if these (or equiv.) were in linux/pci_regs.h, but they're not. */
#define PCI_EXP_DEVCAP_PWR_VAL_LBN 18
#define PCI_EXP_DEVCAP_PWR_SCL_LBN 26
#define PCI_EXP_DEVCTL_PAYLOAD_LBN 5
#define PCI_EXP_LNKSTA_LNK_WID 0x3f0
#define PCI_EXP_LNKSTA_LNK_WID_LBN 4
#define FALCON_IS_DUAL_FUNC(efx) \
(falcon_rev(efx) < FALCON_REV_B0)
/**************************************************************************
*
* Falcon hardware access
*
**************************************************************************/
/* Read the current event from the event queue */
static inline efx_qword_t *falcon_event(struct efx_channel *channel,
unsigned int index)
{
return (((efx_qword_t *) (channel->eventq.addr)) + index);
}
/* See if an event is present
*
* We check both the high and low dword of the event for all ones. We
* wrote all ones when we cleared the event, and no valid event can
* have all ones in either its high or low dwords. This approach is
* robust against reordering.
*
* Note that using a single 64-bit comparison is incorrect; even
* though the CPU read will be atomic, the DMA write may not be.
*/
static inline int falcon_event_present(efx_qword_t *event)
{
return (!(EFX_DWORD_IS_ALL_ONES(event->dword[0]) |
EFX_DWORD_IS_ALL_ONES(event->dword[1])));
}
/**************************************************************************
*
* I2C bus - this is a bit-bashing interface using GPIO pins
* Note that it uses the output enables to tristate the outputs
* SDA is the data pin and SCL is the clock
*
**************************************************************************
*/
static void falcon_setsdascl(struct efx_i2c_interface *i2c)
{
efx_oword_t reg;
falcon_read(i2c->efx, ®, GPIO_CTL_REG_KER);
EFX_SET_OWORD_FIELD(reg, GPIO0_OEN, (i2c->scl ? 0 : 1));
EFX_SET_OWORD_FIELD(reg, GPIO3_OEN, (i2c->sda ? 0 : 1));
falcon_write(i2c->efx, ®, GPIO_CTL_REG_KER);
}
static int falcon_getsda(struct efx_i2c_interface *i2c)
{
efx_oword_t reg;
falcon_read(i2c->efx, ®, GPIO_CTL_REG_KER);
return EFX_OWORD_FIELD(reg, GPIO3_IN);
}
static int falcon_getscl(struct efx_i2c_interface *i2c)
{
efx_oword_t reg;
falcon_read(i2c->efx, ®, GPIO_CTL_REG_KER);
return EFX_DWORD_FIELD(reg, GPIO0_IN);
}
static struct efx_i2c_bit_operations falcon_i2c_bit_operations = {
.setsda = falcon_setsdascl,
.setscl = falcon_setsdascl,
.getsda = falcon_getsda,
.getscl = falcon_getscl,
.udelay = 100,
.mdelay = 10,
};
/**************************************************************************
*
* Falcon special buffer handling
* Special buffers are used for event queues and the TX and RX
* descriptor rings.
*
*************************************************************************/
/*
* Initialise a Falcon special buffer
*
* This will define a buffer (previously allocated via
* falcon_alloc_special_buffer()) in Falcon's buffer table, allowing
* it to be used for event queues, descriptor rings etc.
*/
static int
falcon_init_special_buffer(struct efx_nic *efx,
struct efx_special_buffer *buffer)
{
efx_qword_t buf_desc;
int index;
dma_addr_t dma_addr;
int i;
EFX_BUG_ON_PARANOID(!buffer->addr);
/* Write buffer descriptors to NIC */
for (i = 0; i < buffer->entries; i++) {
index = buffer->index + i;
dma_addr = buffer->dma_addr + (i * 4096);
EFX_LOG(efx, "mapping special buffer %d at %llx\n",
index, (unsigned long long)dma_addr);
EFX_POPULATE_QWORD_4(buf_desc,
IP_DAT_BUF_SIZE, IP_DAT_BUF_SIZE_4K,
BUF_ADR_REGION, 0,
BUF_ADR_FBUF, (dma_addr >> 12),
BUF_OWNER_ID_FBUF, 0);
falcon_write_sram(efx, &buf_desc, index);
}
return 0;
}
/* Unmaps a buffer from Falcon and clears the buffer table entries */
static void
falcon_fini_special_buffer(struct efx_nic *efx,
struct efx_special_buffer *buffer)
{
efx_oword_t buf_tbl_upd;
unsigned int start = buffer->index;
unsigned int end = (buffer->index + buffer->entries - 1);
if (!buffer->entries)
return;
EFX_LOG(efx, "unmapping special buffers %d-%d\n",
buffer->index, buffer->index + buffer->entries - 1);
EFX_POPULATE_OWORD_4(buf_tbl_upd,
BUF_UPD_CMD, 0,
BUF_CLR_CMD, 1,
BUF_CLR_END_ID, end,
BUF_CLR_START_ID, start);
falcon_write(efx, &buf_tbl_upd, BUF_TBL_UPD_REG_KER);
}
/*
* Allocate a new Falcon special buffer
*
* This allocates memory for a new buffer, clears it and allocates a
* new buffer ID range. It does not write into Falcon's buffer table.
*
* This call will allocate 4KB buffers, since Falcon can't use 8KB
* buffers for event queues and descriptor rings.
*/
static int falcon_alloc_special_buffer(struct efx_nic *efx,
struct efx_special_buffer *buffer,
unsigned int len)
{
struct falcon_nic_data *nic_data = efx->nic_data;
len = ALIGN(len, FALCON_BUF_SIZE);
buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
&buffer->dma_addr);
if (!buffer->addr)
return -ENOMEM;
buffer->len = len;
buffer->entries = len / FALCON_BUF_SIZE;
BUG_ON(buffer->dma_addr & (FALCON_BUF_SIZE - 1));
/* All zeros is a potentially valid event so memset to 0xff */
memset(buffer->addr, 0xff, len);
/* Select new buffer ID */
buffer->index = nic_data->next_buffer_table;
nic_data->next_buffer_table += buffer->entries;
EFX_LOG(efx, "allocating special buffers %d-%d at %llx+%x "
"(virt %p phys %lx)\n", buffer->index,
buffer->index + buffer->entries - 1,
(unsigned long long)buffer->dma_addr, len,
buffer->addr, virt_to_phys(buffer->addr));
return 0;
}
static void falcon_free_special_buffer(struct efx_nic *efx,
struct efx_special_buffer *buffer)
{
if (!buffer->addr)
return;
EFX_LOG(efx, "deallocating special buffers %d-%d at %llx+%x "
"(virt %p phys %lx)\n", buffer->index,
buffer->index + buffer->entries - 1,
(unsigned long long)buffer->dma_addr, buffer->len,
buffer->addr, virt_to_phys(buffer->addr));
pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr,
buffer->dma_addr);
buffer->addr = NULL;
buffer->entries = 0;
}
/**************************************************************************
*
* Falcon generic buffer handling
* These buffers are used for interrupt status and MAC stats
*
**************************************************************************/
static int falcon_alloc_buffer(struct efx_nic *efx,
struct efx_buffer *buffer, unsigned int len)
{
buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
&buffer->dma_addr);
if (!buffer->addr)
return -ENOMEM;
buffer->len = len;
memset(buffer->addr, 0, len);
return 0;
}
static void falcon_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer)
{
if (buffer->addr) {
pci_free_consistent(efx->pci_dev, buffer->len,
buffer->addr, buffer->dma_addr);
buffer->addr = NULL;
}
}
/**************************************************************************
*
* Falcon TX path
*
**************************************************************************/
/* Returns a pointer to the specified transmit descriptor in the TX
* descriptor queue belonging to the specified channel.
*/
static inline efx_qword_t *falcon_tx_desc(struct efx_tx_queue *tx_queue,
unsigned int index)
{
return (((efx_qword_t *) (tx_queue->txd.addr)) + index);
}
/* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */
static inline void falcon_notify_tx_desc(struct efx_tx_queue *tx_queue)
{
unsigned write_ptr;
efx_dword_t reg;
write_ptr = tx_queue->write_count & FALCON_TXD_RING_MASK;
EFX_POPULATE_DWORD_1(reg, TX_DESC_WPTR_DWORD, write_ptr);
falcon_writel_page(tx_queue->efx, ®,
TX_DESC_UPD_REG_KER_DWORD, tx_queue->queue);
}
/* For each entry inserted into the software descriptor ring, create a
* descriptor in the hardware TX descriptor ring (in host memory), and
* write a doorbell.
*/
void falcon_push_buffers(struct efx_tx_queue *tx_queue)
{
struct efx_tx_buffer *buffer;
efx_qword_t *txd;
unsigned write_ptr;
BUG_ON(tx_queue->write_count == tx_queue->insert_count);
do {
write_ptr = tx_queue->write_count & FALCON_TXD_RING_MASK;
buffer = &tx_queue->buffer[write_ptr];
txd = falcon_tx_desc(tx_queue, write_ptr);
++tx_queue->write_count;
/* Create TX descriptor ring entry */
EFX_POPULATE_QWORD_5(*txd,
TX_KER_PORT, 0,
TX_KER_CONT, buffer->continuation,
TX_KER_BYTE_CNT, buffer->len,
TX_KER_BUF_REGION, 0,
TX_KER_BUF_ADR, buffer->dma_addr);
} while (tx_queue->write_count != tx_queue->insert_count);
wmb(); /* Ensure descriptors are written before they are fetched */
falcon_notify_tx_desc(tx_queue);
}
/* Allocate hardware resources for a TX queue */
int falcon_probe_tx(struct efx_tx_queue *tx_queue)
{
struct efx_nic *efx = tx_queue->efx;
return falcon_alloc_special_buffer(efx, &tx_queue->txd,
FALCON_TXD_RING_SIZE *
sizeof(efx_qword_t));
}
int falcon_init_tx(struct efx_tx_queue *tx_queue)
{
efx_oword_t tx_desc_ptr;
struct efx_nic *efx = tx_queue->efx;
int rc;
/* Pin TX descriptor ring */
rc = falcon_init_special_buffer(efx, &tx_queue->txd);
if (rc)
return rc;
/* Push TX descriptor ring to card */
EFX_POPULATE_OWORD_10(tx_desc_ptr,
TX_DESCQ_EN, 1,
TX_ISCSI_DDIG_EN, 0,
TX_ISCSI_HDIG_EN, 0,
TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index,
TX_DESCQ_EVQ_ID, tx_queue->channel->evqnum,
TX_DESCQ_OWNER_ID, 0,
TX_DESCQ_LABEL, tx_queue->queue,
TX_DESCQ_SIZE, FALCON_TXD_RING_ORDER,
TX_DESCQ_TYPE, 0,
TX_NON_IP_DROP_DIS_B0, 1);
if (falcon_rev(efx) >= FALCON_REV_B0) {
int csum = !(efx->net_dev->features & NETIF_F_IP_CSUM);
EFX_SET_OWORD_FIELD(tx_desc_ptr, TX_IP_CHKSM_DIS_B0, csum);
EFX_SET_OWORD_FIELD(tx_desc_ptr, TX_TCP_CHKSM_DIS_B0, csum);
}
falcon_write_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
tx_queue->queue);
if (falcon_rev(efx) < FALCON_REV_B0) {
efx_oword_t reg;
BUG_ON(tx_queue->queue >= 128); /* HW limit */
falcon_read(efx, ®, TX_CHKSM_CFG_REG_KER_A1);
if (efx->net_dev->features & NETIF_F_IP_CSUM)
clear_bit_le(tx_queue->queue, (void *)®);
else
set_bit_le(tx_queue->queue, (void *)®);
falcon_write(efx, ®, TX_CHKSM_CFG_REG_KER_A1);
}
return 0;
}
static int falcon_flush_tx_queue(struct efx_tx_queue *tx_queue)
{
struct efx_nic *efx = tx_queue->efx;
struct efx_channel *channel = &efx->channel[0];
efx_oword_t tx_flush_descq;
unsigned int read_ptr, i;
/* Post a flush command */
EFX_POPULATE_OWORD_2(tx_flush_descq,
TX_FLUSH_DESCQ_CMD, 1,
TX_FLUSH_DESCQ, tx_queue->queue);
falcon_write(efx, &tx_flush_descq, TX_FLUSH_DESCQ_REG_KER);
msleep(FALCON_FLUSH_TIMEOUT);
if (EFX_WORKAROUND_7803(efx))
return 0;
/* Look for a flush completed event */
read_ptr = channel->eventq_read_ptr;
for (i = 0; i < FALCON_EVQ_SIZE; ++i) {
efx_qword_t *event = falcon_event(channel, read_ptr);
int ev_code, ev_sub_code, ev_queue;
if (!falcon_event_present(event))
break;
ev_code = EFX_QWORD_FIELD(*event, EV_CODE);
ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE);
ev_queue = EFX_QWORD_FIELD(*event, DRIVER_EV_TX_DESCQ_ID);
if ((ev_sub_code == TX_DESCQ_FLS_DONE_EV_DECODE) &&
(ev_queue == tx_queue->queue)) {
EFX_LOG(efx, "tx queue %d flush command succesful\n",
tx_queue->queue);
return 0;
}
read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK;
}
if (EFX_WORKAROUND_11557(efx)) {
efx_oword_t reg;
int enabled;
falcon_read_table(efx, ®, efx->type->txd_ptr_tbl_base,
tx_queue->queue);
enabled = EFX_OWORD_FIELD(reg, TX_DESCQ_EN);
if (!enabled) {
EFX_LOG(efx, "tx queue %d disabled without a "
"flush event seen\n", tx_queue->queue);
return 0;
}
}
EFX_ERR(efx, "tx queue %d flush command timed out\n", tx_queue->queue);
return -ETIMEDOUT;
}
void falcon_fini_tx(struct efx_tx_queue *tx_queue)
{
struct efx_nic *efx = tx_queue->efx;
efx_oword_t tx_desc_ptr;
/* Stop the hardware using the queue */
if (falcon_flush_tx_queue(tx_queue))
EFX_ERR(efx, "failed to flush tx queue %d\n", tx_queue->queue);
/* Remove TX descriptor ring from card */
EFX_ZERO_OWORD(tx_desc_ptr);
falcon_write_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
tx_queue->queue);
/* Unpin TX descriptor ring */
falcon_fini_special_buffer(efx, &tx_queue->txd);
}
/* Free buffers backing TX queue */
void falcon_remove_tx(struct efx_tx_queue *tx_queue)
{
falcon_free_special_buffer(tx_queue->efx, &tx_queue->txd);
}
/**************************************************************************
*
* Falcon RX path
*
**************************************************************************/
/* Returns a pointer to the specified descriptor in the RX descriptor queue */
static inline efx_qword_t *falcon_rx_desc(struct efx_rx_queue *rx_queue,
unsigned int index)
{
return (((efx_qword_t *) (rx_queue->rxd.addr)) + index);
}
/* This creates an entry in the RX descriptor queue */
static inline void falcon_build_rx_desc(struct efx_rx_queue *rx_queue,
unsigned index)
{
struct efx_rx_buffer *rx_buf;
efx_qword_t *rxd;
rxd = falcon_rx_desc(rx_queue, index);
rx_buf = efx_rx_buffer(rx_queue, index);
EFX_POPULATE_QWORD_3(*rxd,
RX_KER_BUF_SIZE,
rx_buf->len -
rx_queue->efx->type->rx_buffer_padding,
RX_KER_BUF_REGION, 0,
RX_KER_BUF_ADR, rx_buf->dma_addr);
}
/* This writes to the RX_DESC_WPTR register for the specified receive
* descriptor ring.
*/
void falcon_notify_rx_desc(struct efx_rx_queue *rx_queue)
{
efx_dword_t reg;
unsigned write_ptr;
while (rx_queue->notified_count != rx_queue->added_count) {
falcon_build_rx_desc(rx_queue,
rx_queue->notified_count &
FALCON_RXD_RING_MASK);
++rx_queue->notified_count;
}
wmb();
write_ptr = rx_queue->added_count & FALCON_RXD_RING_MASK;
EFX_POPULATE_DWORD_1(reg, RX_DESC_WPTR_DWORD, write_ptr);
falcon_writel_page(rx_queue->efx, ®,
RX_DESC_UPD_REG_KER_DWORD, rx_queue->queue);
}
int falcon_probe_rx(struct efx_rx_queue *rx_queue)
{
struct efx_nic *efx = rx_queue->efx;
return falcon_alloc_special_buffer(efx, &rx_queue->rxd,
FALCON_RXD_RING_SIZE *
sizeof(efx_qword_t));
}
int falcon_init_rx(struct efx_rx_queue *rx_queue)
{
efx_oword_t rx_desc_ptr;
struct efx_nic *efx = rx_queue->efx;
int rc;
int is_b0 = falcon_rev(efx) >= FALCON_REV_B0;
int iscsi_digest_en = is_b0;
EFX_LOG(efx, "RX queue %d ring in special buffers %d-%d\n",
rx_queue->queue, rx_queue->rxd.index,
rx_queue->rxd.index + rx_queue->rxd.entries - 1);
/* Pin RX descriptor ring */
rc = falcon_init_special_buffer(efx, &rx_queue->rxd);
if (rc)
return rc;
/* Push RX descriptor ring to card */
EFX_POPULATE_OWORD_10(rx_desc_ptr,
RX_ISCSI_DDIG_EN, iscsi_digest_en,
RX_ISCSI_HDIG_EN, iscsi_digest_en,
RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index,
RX_DESCQ_EVQ_ID, rx_queue->channel->evqnum,
RX_DESCQ_OWNER_ID, 0,
RX_DESCQ_LABEL, rx_queue->queue,
RX_DESCQ_SIZE, FALCON_RXD_RING_ORDER,
RX_DESCQ_TYPE, 0 /* kernel queue */ ,
/* For >=B0 this is scatter so disable */
RX_DESCQ_JUMBO, !is_b0,
RX_DESCQ_EN, 1);
falcon_write_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
rx_queue->queue);
return 0;
}
static int falcon_flush_rx_queue(struct efx_rx_queue *rx_queue)
{
struct efx_nic *efx = rx_queue->efx;
struct efx_channel *channel = &efx->channel[0];
unsigned int read_ptr, i;
efx_oword_t rx_flush_descq;
/* Post a flush command */
EFX_POPULATE_OWORD_2(rx_flush_descq,
RX_FLUSH_DESCQ_CMD, 1,
RX_FLUSH_DESCQ, rx_queue->queue);
falcon_write(efx, &rx_flush_descq, RX_FLUSH_DESCQ_REG_KER);
msleep(FALCON_FLUSH_TIMEOUT);
if (EFX_WORKAROUND_7803(efx))
return 0;
/* Look for a flush completed event */
read_ptr = channel->eventq_read_ptr;
for (i = 0; i < FALCON_EVQ_SIZE; ++i) {
efx_qword_t *event = falcon_event(channel, read_ptr);
int ev_code, ev_sub_code, ev_queue, ev_failed;
if (!falcon_event_present(event))
break;
ev_code = EFX_QWORD_FIELD(*event, EV_CODE);
ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE);
ev_queue = EFX_QWORD_FIELD(*event, DRIVER_EV_RX_DESCQ_ID);
ev_failed = EFX_QWORD_FIELD(*event, DRIVER_EV_RX_FLUSH_FAIL);
if ((ev_sub_code == RX_DESCQ_FLS_DONE_EV_DECODE) &&
(ev_queue == rx_queue->queue)) {
if (ev_failed) {
EFX_INFO(efx, "rx queue %d flush command "
"failed\n", rx_queue->queue);
return -EAGAIN;
} else {
EFX_LOG(efx, "rx queue %d flush command "
"succesful\n", rx_queue->queue);
return 0;
}
}
read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK;
}
if (EFX_WORKAROUND_11557(efx)) {
efx_oword_t reg;
int enabled;
falcon_read_table(efx, ®, efx->type->rxd_ptr_tbl_base,
rx_queue->queue);
enabled = EFX_OWORD_FIELD(reg, RX_DESCQ_EN);
if (!enabled) {
EFX_LOG(efx, "rx queue %d disabled without a "
"flush event seen\n", rx_queue->queue);
return 0;
}
}
EFX_ERR(efx, "rx queue %d flush command timed out\n", rx_queue->queue);
return -ETIMEDOUT;
}
void falcon_fini_rx(struct efx_rx_queue *rx_queue)
{
efx_oword_t rx_desc_ptr;
struct efx_nic *efx = rx_queue->efx;
int i, rc;
/* Try and flush the rx queue. This may need to be repeated */
for (i = 0; i < 5; i++) {
rc = falcon_flush_rx_queue(rx_queue);
if (rc == -EAGAIN)
continue;
break;
}
if (rc)
EFX_ERR(efx, "failed to flush rx queue %d\n", rx_queue->queue);
/* Remove RX descriptor ring from card */
EFX_ZERO_OWORD(rx_desc_ptr);
falcon_write_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
rx_queue->queue);
/* Unpin RX descriptor ring */
falcon_fini_special_buffer(efx, &rx_queue->rxd);
}
/* Free buffers backing RX queue */
void falcon_remove_rx(struct efx_rx_queue *rx_queue)
{
falcon_free_special_buffer(rx_queue->efx, &rx_queue->rxd);
}
/**************************************************************************
*
* Falcon event queue processing
* Event queues are processed by per-channel tasklets.
*
**************************************************************************/
/* Update a channel's event queue's read pointer (RPTR) register
*
* This writes the EVQ_RPTR_REG register for the specified channel's
* event queue.
*
* Note that EVQ_RPTR_REG contains the index of the "last read" event,
* whereas channel->eventq_read_ptr contains the index of the "next to
* read" event.
*/
void falcon_eventq_read_ack(struct efx_channel *channel)
{
efx_dword_t reg;
struct efx_nic *efx = channel->efx;
EFX_POPULATE_DWORD_1(reg, EVQ_RPTR_DWORD, channel->eventq_read_ptr);
falcon_writel_table(efx, ®, efx->type->evq_rptr_tbl_base,
channel->evqnum);
}
/* Use HW to insert a SW defined event */
void falcon_generate_event(struct efx_channel *channel, efx_qword_t *event)
{
efx_oword_t drv_ev_reg;
EFX_POPULATE_OWORD_2(drv_ev_reg,
DRV_EV_QID, channel->evqnum,
DRV_EV_DATA,
EFX_QWORD_FIELD64(*event, WHOLE_EVENT));
falcon_write(channel->efx, &drv_ev_reg, DRV_EV_REG_KER);
}
/* Handle a transmit completion event
*
* Falcon batches TX completion events; the message we receive is of
* the form "complete all TX events up to this index".
*/
static inline void falcon_handle_tx_event(struct efx_channel *channel,
efx_qword_t *event)
{
unsigned int tx_ev_desc_ptr;
unsigned int tx_ev_q_label;
struct efx_tx_queue *tx_queue;
struct efx_nic *efx = channel->efx;
if (likely(EFX_QWORD_FIELD(*event, TX_EV_COMP))) {
/* Transmit completion */
tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, TX_EV_DESC_PTR);
tx_ev_q_label = EFX_QWORD_FIELD(*event, TX_EV_Q_LABEL);
tx_queue = &efx->tx_queue[tx_ev_q_label];
efx_xmit_done(tx_queue, tx_ev_desc_ptr);
} else if (EFX_QWORD_FIELD(*event, TX_EV_WQ_FF_FULL)) {
/* Rewrite the FIFO write pointer */
tx_ev_q_label = EFX_QWORD_FIELD(*event, TX_EV_Q_LABEL);
tx_queue = &efx->tx_queue[tx_ev_q_label];
if (efx_dev_registered(efx))
netif_tx_lock(efx->net_dev);
falcon_notify_tx_desc(tx_queue);
if (efx_dev_registered(efx))
netif_tx_unlock(efx->net_dev);
} else if (EFX_QWORD_FIELD(*event, TX_EV_PKT_ERR) &&
EFX_WORKAROUND_10727(efx)) {
efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
} else {
EFX_ERR(efx, "channel %d unexpected TX event "
EFX_QWORD_FMT"\n", channel->channel,
EFX_QWORD_VAL(*event));
}
}
/* Check received packet's destination MAC address. */
static int check_dest_mac(struct efx_rx_queue *rx_queue,
const efx_qword_t *event)
{
struct efx_rx_buffer *rx_buf;
struct efx_nic *efx = rx_queue->efx;
int rx_ev_desc_ptr;
struct ethhdr *eh;
if (efx->promiscuous)
return 1;
rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, RX_EV_DESC_PTR);
rx_buf = efx_rx_buffer(rx_queue, rx_ev_desc_ptr);
eh = (struct ethhdr *)rx_buf->data;
if (memcmp(eh->h_dest, efx->net_dev->dev_addr, ETH_ALEN))
return 0;
return 1;
}
/* Detect errors included in the rx_evt_pkt_ok bit. */
static void falcon_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
const efx_qword_t *event,
unsigned *rx_ev_pkt_ok,
int *discard, int byte_count)
{
struct efx_nic *efx = rx_queue->efx;
unsigned rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err;
unsigned rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err;
unsigned rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc;
unsigned rx_ev_pkt_type, rx_ev_other_err, rx_ev_pause_frm;
unsigned rx_ev_ip_frag_err, rx_ev_hdr_type, rx_ev_mcast_pkt;
int snap, non_ip;
rx_ev_hdr_type = EFX_QWORD_FIELD(*event, RX_EV_HDR_TYPE);
rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, RX_EV_MCAST_PKT);
rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, RX_EV_TOBE_DISC);
rx_ev_pkt_type = EFX_QWORD_FIELD(*event, RX_EV_PKT_TYPE);
rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event,
RX_EV_BUF_OWNER_ID_ERR);
rx_ev_ip_frag_err = EFX_QWORD_FIELD(*event, RX_EV_IF_FRAG_ERR);
rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event,
RX_EV_IP_HDR_CHKSUM_ERR);
rx_ev_tcp_udp_chksum_err = EFX_QWORD_FIELD(*event,
RX_EV_TCP_UDP_CHKSUM_ERR);
rx_ev_eth_crc_err = EFX_QWORD_FIELD(*event, RX_EV_ETH_CRC_ERR);
rx_ev_frm_trunc = EFX_QWORD_FIELD(*event, RX_EV_FRM_TRUNC);
rx_ev_drib_nib = ((falcon_rev(efx) >= FALCON_REV_B0) ?
0 : EFX_QWORD_FIELD(*event, RX_EV_DRIB_NIB));
rx_ev_pause_frm = EFX_QWORD_FIELD(*event, RX_EV_PAUSE_FRM_ERR);
/* Every error apart from tobe_disc and pause_frm */
rx_ev_other_err = (rx_ev_drib_nib | rx_ev_tcp_udp_chksum_err |
rx_ev_buf_owner_id_err | rx_ev_eth_crc_err |
rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err);
snap = (rx_ev_pkt_type == RX_EV_PKT_TYPE_LLC_DECODE) ||
(rx_ev_pkt_type == RX_EV_PKT_TYPE_VLAN_LLC_DECODE);
non_ip = (rx_ev_hdr_type == RX_EV_HDR_TYPE_NON_IP_DECODE);
/* SFC bug 5475/8970: The Falcon XMAC incorrectly calculates the
* length field of an LLC frame, which sets TOBE_DISC. We could set
* PASS_LEN_ERR, but we want the MAC to filter out short frames (to
* protect the RX block).
*
* bug5475 - LLC/SNAP: Falcon identifies SNAP packets.
* bug8970 - LLC/noSNAP: Falcon does not provide an LLC flag.
* LLC can't encapsulate IP, so by definition
* these packets are NON_IP.
*
* Unicast mismatch will also cause TOBE_DISC, so the driver needs
* to check this.
*/
if (EFX_WORKAROUND_5475(efx) && rx_ev_tobe_disc && (snap || non_ip)) {
/* If all the other flags are zero then we can state the
* entire packet is ok, which will flag to the kernel not
* to recalculate checksums.
*/
if (!(non_ip | rx_ev_other_err | rx_ev_pause_frm))
*rx_ev_pkt_ok = 1;
rx_ev_tobe_disc = 0;
/* TOBE_DISC is set for unicast mismatch. But given that
* we can't trust TOBE_DISC here, we must validate the dest
* MAC address ourselves.
*/
if (!rx_ev_mcast_pkt && !check_dest_mac(rx_queue, event))
rx_ev_tobe_disc = 1;
}
/* Count errors that are not in MAC stats. */
if (rx_ev_frm_trunc)
++rx_queue->channel->n_rx_frm_trunc;
else if (rx_ev_tobe_disc)
++rx_queue->channel->n_rx_tobe_disc;
else if (rx_ev_ip_hdr_chksum_err)
++rx_queue->channel->n_rx_ip_hdr_chksum_err;
else if (rx_ev_tcp_udp_chksum_err)
++rx_queue->channel->n_rx_tcp_udp_chksum_err;
if (rx_ev_ip_frag_err)
++rx_queue->channel->n_rx_ip_frag_err;
/* The frame must be discarded if any of these are true. */
*discard = (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib |
rx_ev_tobe_disc | rx_ev_pause_frm);
/* TOBE_DISC is expected on unicast mismatches; don't print out an
* error message. FRM_TRUNC indicates RXDP dropped the packet due
* to a FIFO overflow.
*/
#ifdef EFX_ENABLE_DEBUG
if (rx_ev_other_err) {
EFX_INFO_RL(efx, " RX queue %d unexpected RX event "
EFX_QWORD_FMT "%s%s%s%s%s%s%s%s%s\n",
rx_queue->queue, EFX_QWORD_VAL(*event),
rx_ev_buf_owner_id_err ? " [OWNER_ID_ERR]" : "",
rx_ev_ip_hdr_chksum_err ?
" [IP_HDR_CHKSUM_ERR]" : "",
rx_ev_tcp_udp_chksum_err ?
" [TCP_UDP_CHKSUM_ERR]" : "",
rx_ev_eth_crc_err ? " [ETH_CRC_ERR]" : "",
rx_ev_frm_trunc ? " [FRM_TRUNC]" : "",
rx_ev_drib_nib ? " [DRIB_NIB]" : "",
rx_ev_tobe_disc ? " [TOBE_DISC]" : "",
rx_ev_pause_frm ? " [PAUSE]" : "",
snap ? " [SNAP/LLC]" : "");
}
#endif
if (unlikely(rx_ev_eth_crc_err && EFX_WORKAROUND_10750(efx) &&
efx->phy_type == PHY_TYPE_10XPRESS))
tenxpress_crc_err(efx);
}
/* Handle receive events that are not in-order. */
static void falcon_handle_rx_bad_index(struct efx_rx_queue *rx_queue,
unsigned index)
{
struct efx_nic *efx = rx_queue->efx;
unsigned expected, dropped;
expected = rx_queue->removed_count & FALCON_RXD_RING_MASK;
dropped = ((index + FALCON_RXD_RING_SIZE - expected) &
FALCON_RXD_RING_MASK);
EFX_INFO(efx, "dropped %d events (index=%d expected=%d)\n",
dropped, index, expected);
efx_schedule_reset(efx, EFX_WORKAROUND_5676(efx) ?
RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
}
/* Handle a packet received event
*
* Falcon silicon gives a "discard" flag if it's a unicast packet with the
* wrong destination address
* Also "is multicast" and "matches multicast filter" flags can be used to
* discard non-matching multicast packets.
*/
static inline int falcon_handle_rx_event(struct efx_channel *channel,
const efx_qword_t *event)
{
unsigned int rx_ev_q_label, rx_ev_desc_ptr, rx_ev_byte_cnt;
unsigned int rx_ev_pkt_ok, rx_ev_hdr_type, rx_ev_mcast_pkt;
unsigned expected_ptr;
int discard = 0, checksummed;
struct efx_rx_queue *rx_queue;
struct efx_nic *efx = channel->efx;
/* Basic packet information */
rx_ev_byte_cnt = EFX_QWORD_FIELD(*event, RX_EV_BYTE_CNT);
rx_ev_pkt_ok = EFX_QWORD_FIELD(*event, RX_EV_PKT_OK);
rx_ev_hdr_type = EFX_QWORD_FIELD(*event, RX_EV_HDR_TYPE);
WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_JUMBO_CONT));
WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_SOP) != 1);
rx_ev_q_label = EFX_QWORD_FIELD(*event, RX_EV_Q_LABEL);
rx_queue = &efx->rx_queue[rx_ev_q_label];
rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, RX_EV_DESC_PTR);
expected_ptr = rx_queue->removed_count & FALCON_RXD_RING_MASK;
if (unlikely(rx_ev_desc_ptr != expected_ptr)) {
falcon_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr);
return rx_ev_q_label;
}
if (likely(rx_ev_pkt_ok)) {
/* If packet is marked as OK and packet type is TCP/IPv4 or
* UDP/IPv4, then we can rely on the hardware checksum.
*/
checksummed = RX_EV_HDR_TYPE_HAS_CHECKSUMS(rx_ev_hdr_type);
} else {
falcon_handle_rx_not_ok(rx_queue, event, &rx_ev_pkt_ok,
&discard, rx_ev_byte_cnt);
checksummed = 0;
}
/* Detect multicast packets that didn't match the filter */
rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, RX_EV_MCAST_PKT);
if (rx_ev_mcast_pkt) {
unsigned int rx_ev_mcast_hash_match =
EFX_QWORD_FIELD(*event, RX_EV_MCAST_HASH_MATCH);
if (unlikely(!rx_ev_mcast_hash_match))
discard = 1;
}
/* Handle received packet */
efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt,
checksummed, discard);
return rx_ev_q_label;
}
/* Global events are basically PHY events */
static void falcon_handle_global_event(struct efx_channel *channel,
efx_qword_t *event)
{
struct efx_nic *efx = channel->efx;
int is_phy_event = 0, handled = 0;
/* Check for interrupt on either port. Some boards have a
* single PHY wired to the interrupt line for port 1. */
if (EFX_QWORD_FIELD(*event, G_PHY0_INTR) ||
EFX_QWORD_FIELD(*event, G_PHY1_INTR) ||
EFX_QWORD_FIELD(*event, XG_PHY_INTR))
is_phy_event = 1;
if ((falcon_rev(efx) >= FALCON_REV_B0) &&
EFX_OWORD_FIELD(*event, XG_MNT_INTR_B0))
is_phy_event = 1;
if (is_phy_event) {
efx->phy_op->clear_interrupt(efx);
queue_work(efx->workqueue, &efx->reconfigure_work);
handled = 1;
}
if (EFX_QWORD_FIELD_VER(efx, *event, RX_RECOVERY)) {
EFX_ERR(efx, "channel %d seen global RX_RESET "
"event. Resetting.\n", channel->channel);
atomic_inc(&efx->rx_reset);
efx_schedule_reset(efx, EFX_WORKAROUND_6555(efx) ?
RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
handled = 1;
}
if (!handled)
EFX_ERR(efx, "channel %d unknown global event "
EFX_QWORD_FMT "\n", channel->channel,
EFX_QWORD_VAL(*event));
}
static void falcon_handle_driver_event(struct efx_channel *channel,
efx_qword_t *event)
{
struct efx_nic *efx = channel->efx;
unsigned int ev_sub_code;
unsigned int ev_sub_data;
ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE);
ev_sub_data = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_DATA);
switch (ev_sub_code) {
case TX_DESCQ_FLS_DONE_EV_DECODE:
EFX_TRACE(efx, "channel %d TXQ %d flushed\n",
channel->channel, ev_sub_data);
break;
case RX_DESCQ_FLS_DONE_EV_DECODE:
EFX_TRACE(efx, "channel %d RXQ %d flushed\n",
channel->channel, ev_sub_data);
break;
case EVQ_INIT_DONE_EV_DECODE:
EFX_LOG(efx, "channel %d EVQ %d initialised\n",
channel->channel, ev_sub_data);
break;
case SRM_UPD_DONE_EV_DECODE:
EFX_TRACE(efx, "channel %d SRAM update done\n",
channel->channel);
break;
case WAKE_UP_EV_DECODE:
EFX_TRACE(efx, "channel %d RXQ %d wakeup event\n",
channel->channel, ev_sub_data);
break;
case TIMER_EV_DECODE:
EFX_TRACE(efx, "channel %d RX queue %d timer expired\n",
channel->channel, ev_sub_data);
break;
case RX_RECOVERY_EV_DECODE:
EFX_ERR(efx, "channel %d seen DRIVER RX_RESET event. "
"Resetting.\n", channel->channel);
atomic_inc(&efx->rx_reset);
efx_schedule_reset(efx,
EFX_WORKAROUND_6555(efx) ?
RESET_TYPE_RX_RECOVERY :
RESET_TYPE_DISABLE);
break;
case RX_DSC_ERROR_EV_DECODE:
EFX_ERR(efx, "RX DMA Q %d reports descriptor fetch error."
" RX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
efx_schedule_reset(efx, RESET_TYPE_RX_DESC_FETCH);
break;
case TX_DSC_ERROR_EV_DECODE:
EFX_ERR(efx, "TX DMA Q %d reports descriptor fetch error."
" TX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
break;
default:
EFX_TRACE(efx, "channel %d unknown driver event code %d "
"data %04x\n", channel->channel, ev_sub_code,
ev_sub_data);
break;
}
}
int falcon_process_eventq(struct efx_channel *channel, int *rx_quota)
{
unsigned int read_ptr;
efx_qword_t event, *p_event;
int ev_code;
int rxq;
int rxdmaqs = 0;
read_ptr = channel->eventq_read_ptr;
do {
p_event = falcon_event(channel, read_ptr);
event = *p_event;
if (!falcon_event_present(&event))
/* End of events */
break;
EFX_TRACE(channel->efx, "channel %d event is "EFX_QWORD_FMT"\n",
channel->channel, EFX_QWORD_VAL(event));
/* Clear this event by marking it all ones */
EFX_SET_QWORD(*p_event);
ev_code = EFX_QWORD_FIELD(event, EV_CODE);
switch (ev_code) {
case RX_IP_EV_DECODE:
rxq = falcon_handle_rx_event(channel, &event);
rxdmaqs |= (1 << rxq);
(*rx_quota)--;
break;
case TX_IP_EV_DECODE:
falcon_handle_tx_event(channel, &event);
break;
case DRV_GEN_EV_DECODE:
channel->eventq_magic
= EFX_QWORD_FIELD(event, EVQ_MAGIC);
EFX_LOG(channel->efx, "channel %d received generated "
"event "EFX_QWORD_FMT"\n", channel->channel,
EFX_QWORD_VAL(event));
break;
case GLOBAL_EV_DECODE:
falcon_handle_global_event(channel, &event);
break;
case DRIVER_EV_DECODE:
falcon_handle_driver_event(channel, &event);
break;
default:
EFX_ERR(channel->efx, "channel %d unknown event type %d"
" (data " EFX_QWORD_FMT ")\n", channel->channel,
ev_code, EFX_QWORD_VAL(event));
}
/* Increment read pointer */
read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK;
} while (*rx_quota);
channel->eventq_read_ptr = read_ptr;
return rxdmaqs;
}
void falcon_set_int_moderation(struct efx_channel *channel)
{
efx_dword_t timer_cmd;
struct efx_nic *efx = channel->efx;
/* Set timer register */
if (channel->irq_moderation) {
/* Round to resolution supported by hardware. The value we
* program is based at 0. So actual interrupt moderation
* achieved is ((x + 1) * res).
*/
unsigned int res = 5;
channel->irq_moderation -= (channel->irq_moderation % res);
if (channel->irq_moderation < res)
channel->irq_moderation = res;
EFX_POPULATE_DWORD_2(timer_cmd,
TIMER_MODE, TIMER_MODE_INT_HLDOFF,
TIMER_VAL,
(channel->irq_moderation / res) - 1);
} else {
EFX_POPULATE_DWORD_2(timer_cmd,
TIMER_MODE, TIMER_MODE_DIS,
TIMER_VAL, 0);
}
falcon_writel_page_locked(efx, &timer_cmd, TIMER_CMD_REG_KER,
channel->evqnum);
}
/* Allocate buffer table entries for event queue */
int falcon_probe_eventq(struct efx_channel *channel)
{
struct efx_nic *efx = channel->efx;
unsigned int evq_size;
evq_size = FALCON_EVQ_SIZE * sizeof(efx_qword_t);
return falcon_alloc_special_buffer(efx, &channel->eventq, evq_size);
}
int falcon_init_eventq(struct efx_channel *channel)
{
efx_oword_t evq_ptr;
struct efx_nic *efx = channel->efx;
int rc;
EFX_LOG(efx, "channel %d event queue in special buffers %d-%d\n",
channel->channel, channel->eventq.index,
channel->eventq.index + channel->eventq.entries - 1);
/* Pin event queue buffer */
rc = falcon_init_special_buffer(efx, &channel->eventq);
if (rc)
return rc;
/* Fill event queue with all ones (i.e. empty events) */
memset(channel->eventq.addr, 0xff, channel->eventq.len);
/* Push event queue to card */
EFX_POPULATE_OWORD_3(evq_ptr,
EVQ_EN, 1,
EVQ_SIZE, FALCON_EVQ_ORDER,
EVQ_BUF_BASE_ID, channel->eventq.index);
falcon_write_table(efx, &evq_ptr, efx->type->evq_ptr_tbl_base,
channel->evqnum);
falcon_set_int_moderation(channel);
return 0;
}
void falcon_fini_eventq(struct efx_channel *channel)
{
efx_oword_t eventq_ptr;
struct efx_nic *efx = channel->efx;
/* Remove event queue from card */
EFX_ZERO_OWORD(eventq_ptr);
falcon_write_table(efx, &eventq_ptr, efx->type->evq_ptr_tbl_base,
channel->evqnum);
/* Unpin event queue */
falcon_fini_special_buffer(efx, &channel->eventq);
}
/* Free buffers backing event queue */
void falcon_remove_eventq(struct efx_channel *channel)
{
falcon_free_special_buffer(channel->efx, &channel->eventq);
}
/* Generates a test event on the event queue. A subsequent call to
* process_eventq() should pick up the event and place the value of
* "magic" into channel->eventq_magic;
*/
void falcon_generate_test_event(struct efx_channel *channel, unsigned int magic)
{
efx_qword_t test_event;
EFX_POPULATE_QWORD_2(test_event,
EV_CODE, DRV_GEN_EV_DECODE,
EVQ_MAGIC, magic);
falcon_generate_event(channel, &test_event);
}
/**************************************************************************
*
* Falcon hardware interrupts
* The hardware interrupt handler does very little work; all the event
* queue processing is carried out by per-channel tasklets.
*
**************************************************************************/
/* Enable/disable/generate Falcon interrupts */
static inline void falcon_interrupts(struct efx_nic *efx, int enabled,
int force)
{
efx_oword_t int_en_reg_ker;
EFX_POPULATE_OWORD_2(int_en_reg_ker,
KER_INT_KER, force,
DRV_INT_EN_KER, enabled);
falcon_write(efx, &int_en_reg_ker, INT_EN_REG_KER);
}
void falcon_enable_interrupts(struct efx_nic *efx)
{
efx_oword_t int_adr_reg_ker;
struct efx_channel *channel;
EFX_ZERO_OWORD(*((efx_oword_t *) efx->irq_status.addr));
wmb(); /* Ensure interrupt vector is clear before interrupts enabled */
/* Program address */
EFX_POPULATE_OWORD_2(int_adr_reg_ker,
NORM_INT_VEC_DIS_KER, EFX_INT_MODE_USE_MSI(efx),
INT_ADR_KER, efx->irq_status.dma_addr);
falcon_write(efx, &int_adr_reg_ker, INT_ADR_REG_KER);
/* Enable interrupts */
falcon_interrupts(efx, 1, 0);
/* Force processing of all the channels to get the EVQ RPTRs up to
date */
efx_for_each_channel_with_interrupt(channel, efx)
efx_schedule_channel(channel);
}
void falcon_disable_interrupts(struct efx_nic *efx)
{
/* Disable interrupts */
falcon_interrupts(efx, 0, 0);
}
/* Generate a Falcon test interrupt
* Interrupt must already have been enabled, otherwise nasty things
* may happen.
*/
void falcon_generate_interrupt(struct efx_nic *efx)
{
falcon_interrupts(efx, 1, 1);
}
/* Acknowledge a legacy interrupt from Falcon
*
* This acknowledges a legacy (not MSI) interrupt via INT_ACK_KER_REG.
*
* Due to SFC bug 3706 (silicon revision <=A1) reads can be duplicated in the
* BIU. Interrupt acknowledge is read sensitive so must write instead
* (then read to ensure the BIU collector is flushed)
*
* NB most hardware supports MSI interrupts
*/
static inline void falcon_irq_ack_a1(struct efx_nic *efx)
{
efx_dword_t reg;
EFX_POPULATE_DWORD_1(reg, INT_ACK_DUMMY_DATA, 0xb7eb7e);
falcon_writel(efx, ®, INT_ACK_REG_KER_A1);
falcon_readl(efx, ®, WORK_AROUND_BROKEN_PCI_READS_REG_KER_A1);
}
/* Process a fatal interrupt
* Disable bus mastering ASAP and schedule a reset
*/
static irqreturn_t falcon_fatal_interrupt(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
efx_oword_t fatal_intr;
int error, mem_perr;
static int n_int_errors;
falcon_read(efx, &fatal_intr, FATAL_INTR_REG_KER);
error = EFX_OWORD_FIELD(fatal_intr, INT_KER_ERROR);
EFX_ERR(efx, "SYSTEM ERROR " EFX_OWORD_FMT " status "
EFX_OWORD_FMT ": %s\n", EFX_OWORD_VAL(*int_ker),
EFX_OWORD_VAL(fatal_intr),
error ? "disabling bus mastering" : "no recognised error");
if (error == 0)
goto out;
/* If this is a memory parity error dump which blocks are offending */
mem_perr = EFX_OWORD_FIELD(fatal_intr, MEM_PERR_INT_KER);
if (mem_perr) {
efx_oword_t reg;
falcon_read(efx, ®, MEM_STAT_REG_KER);
EFX_ERR(efx, "SYSTEM ERROR: memory parity error "
EFX_OWORD_FMT "\n", EFX_OWORD_VAL(reg));
}
/* Disable DMA bus mastering on both devices */
pci_disable_device(efx->pci_dev);
if (FALCON_IS_DUAL_FUNC(efx))
pci_disable_device(nic_data->pci_dev2);
if (++n_int_errors < FALCON_MAX_INT_ERRORS) {
EFX_ERR(efx, "SYSTEM ERROR - reset scheduled\n");
efx_schedule_reset(efx, RESET_TYPE_INT_ERROR);
} else {
EFX_ERR(efx, "SYSTEM ERROR - max number of errors seen."
"NIC will be disabled\n");
efx_schedule_reset(efx, RESET_TYPE_DISABLE);
}
out:
return IRQ_HANDLED;
}
/* Handle a legacy interrupt from Falcon
* Acknowledges the interrupt and schedule event queue processing.
*/
static irqreturn_t falcon_legacy_interrupt_b0(int irq, void *dev_id)
{
struct efx_nic *efx = (struct efx_nic *)dev_id;
efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
struct efx_channel *channel;
efx_dword_t reg;
u32 queues;
int syserr;
/* Read the ISR which also ACKs the interrupts */
falcon_readl(efx, ®, INT_ISR0_B0);
queues = EFX_EXTRACT_DWORD(reg, 0, 31);
/* Check to see if we have a serious error condition */
syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT);
if (unlikely(syserr))
return falcon_fatal_interrupt(efx);
if (queues == 0)
return IRQ_NONE;
efx->last_irq_cpu = raw_smp_processor_id();
EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",
irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));
/* Schedule processing of any interrupting queues */
channel = &efx->channel[0];
while (queues) {
if (queues & 0x01)
efx_schedule_channel(channel);
channel++;
queues >>= 1;
}
return IRQ_HANDLED;
}
static irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
{
struct efx_nic *efx = (struct efx_nic *)dev_id;
efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
struct efx_channel *channel;
int syserr;
int queues;
/* Check to see if this is our interrupt. If it isn't, we
* exit without having touched the hardware.
*/
if (unlikely(EFX_OWORD_IS_ZERO(*int_ker))) {
EFX_TRACE(efx, "IRQ %d on CPU %d not for me\n", irq,
raw_smp_processor_id());
return IRQ_NONE;
}
efx->last_irq_cpu = raw_smp_processor_id();
EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));
/* Check to see if we have a serious error condition */
syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT);
if (unlikely(syserr))
return falcon_fatal_interrupt(efx);
/* Determine interrupting queues, clear interrupt status
* register and acknowledge the device interrupt.
*/
BUILD_BUG_ON(INT_EVQS_WIDTH > EFX_MAX_CHANNELS);
queues = EFX_OWORD_FIELD(*int_ker, INT_EVQS);
EFX_ZERO_OWORD(*int_ker);
wmb(); /* Ensure the vector is cleared before interrupt ack */
falcon_irq_ack_a1(efx);
/* Schedule processing of any interrupting queues */
channel = &efx->channel[0];
while (queues) {
if (queues & 0x01)
efx_schedule_channel(channel);
channel++;
queues >>= 1;
}
return IRQ_HANDLED;
}
/* Handle an MSI interrupt from Falcon
*
* Handle an MSI hardware interrupt. This routine schedules event
* queue processing. No interrupt acknowledgement cycle is necessary.
* Also, we never need to check that the interrupt is for us, since
* MSI interrupts cannot be shared.
*/
static irqreturn_t falcon_msi_interrupt(int irq, void *dev_id)
{
struct efx_channel *channel = (struct efx_channel *)dev_id;
struct efx_nic *efx = channel->efx;
efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
int syserr;
efx->last_irq_cpu = raw_smp_processor_id();
EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));
/* Check to see if we have a serious error condition */
syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT);
if (unlikely(syserr))
return falcon_fatal_interrupt(efx);
/* Schedule processing of the channel */
efx_schedule_channel(channel);
return IRQ_HANDLED;
}
/* Setup RSS indirection table.
* This maps from the hash value of the packet to RXQ
*/
static void falcon_setup_rss_indir_table(struct efx_nic *efx)
{
int i = 0;
unsigned long offset;
efx_dword_t dword;
if (falcon_rev(efx) < FALCON_REV_B0)
return;
for (offset = RX_RSS_INDIR_TBL_B0;
offset < RX_RSS_INDIR_TBL_B0 + 0x800;
offset += 0x10) {
EFX_POPULATE_DWORD_1(dword, RX_RSS_INDIR_ENT_B0,
i % efx->rss_queues);
falcon_writel(efx, &dword, offset);
i++;
}
}
/* Hook interrupt handler(s)
* Try MSI and then legacy interrupts.
*/
int falcon_init_interrupt(struct efx_nic *efx)
{
struct efx_channel *channel;
int rc;
if (!EFX_INT_MODE_USE_MSI(efx)) {
irq_handler_t handler;
if (falcon_rev(efx) >= FALCON_REV_B0)
handler = falcon_legacy_interrupt_b0;
else
handler = falcon_legacy_interrupt_a1;
rc = request_irq(efx->legacy_irq, handler, IRQF_SHARED,
efx->name, efx);
if (rc) {
EFX_ERR(efx, "failed to hook legacy IRQ %d\n",
efx->pci_dev->irq);
goto fail1;
}
return 0;
}
/* Hook MSI or MSI-X interrupt */
efx_for_each_channel_with_interrupt(channel, efx) {
rc = request_irq(channel->irq, falcon_msi_interrupt,
IRQF_PROBE_SHARED, /* Not shared */
efx->name, channel);
if (rc) {
EFX_ERR(efx, "failed to hook IRQ %d\n", channel->irq);
goto fail2;
}
}
return 0;
fail2:
efx_for_each_channel_with_interrupt(channel, efx)
free_irq(channel->irq, channel);
fail1:
return rc;
}
void falcon_fini_interrupt(struct efx_nic *efx)
{
struct efx_channel *channel;
efx_oword_t reg;
/* Disable MSI/MSI-X interrupts */
efx_for_each_channel_with_interrupt(channel, efx) {
if (channel->irq)
free_irq(channel->irq, channel);
}
/* ACK legacy interrupt */
if (falcon_rev(efx) >= FALCON_REV_B0)
falcon_read(efx, ®, INT_ISR0_B0);
else
falcon_irq_ack_a1(efx);
/* Disable legacy interrupt */
if (efx->legacy_irq)
free_irq(efx->legacy_irq, efx);
}
/**************************************************************************
*
* EEPROM/flash
*
**************************************************************************
*/
#define FALCON_SPI_MAX_LEN sizeof(efx_oword_t)
/* Wait for SPI command completion */
static int falcon_spi_wait(struct efx_nic *efx)
{
efx_oword_t reg;
int cmd_en, timer_active;
int count;
count = 0;
do {
falcon_read(efx, ®, EE_SPI_HCMD_REG_KER);
cmd_en = EFX_OWORD_FIELD(reg, EE_SPI_HCMD_CMD_EN);
timer_active = EFX_OWORD_FIELD(reg, EE_WR_TIMER_ACTIVE);
if (!cmd_en && !timer_active)
return 0;
udelay(10);
} while (++count < 10000); /* wait upto 100msec */
EFX_ERR(efx, "timed out waiting for SPI\n");
return -ETIMEDOUT;
}
static int
falcon_spi_read(struct efx_nic *efx, int device_id, unsigned int command,
unsigned int address, unsigned int addr_len,
void *data, unsigned int len)
{
efx_oword_t reg;
int rc;
BUG_ON(len > FALCON_SPI_MAX_LEN);
/* Check SPI not currently being accessed */
rc = falcon_spi_wait(efx);
if (rc)
return rc;
/* Program address register */
EFX_POPULATE_OWORD_1(reg, EE_SPI_HADR_ADR, address);
falcon_write(efx, ®, EE_SPI_HADR_REG_KER);
/* Issue read command */
EFX_POPULATE_OWORD_7(reg,
EE_SPI_HCMD_CMD_EN, 1,
EE_SPI_HCMD_SF_SEL, device_id,
EE_SPI_HCMD_DABCNT, len,
EE_SPI_HCMD_READ, EE_SPI_READ,
EE_SPI_HCMD_DUBCNT, 0,
EE_SPI_HCMD_ADBCNT, addr_len,
EE_SPI_HCMD_ENC, command);
falcon_write(efx, ®, EE_SPI_HCMD_REG_KER);
/* Wait for read to complete */
rc = falcon_spi_wait(efx);
if (rc)
return rc;
/* Read data */
falcon_read(efx, ®, EE_SPI_HDATA_REG_KER);
memcpy(data, ®, len);
return 0;
}
/**************************************************************************
*
* MAC wrapper
*
**************************************************************************
*/
void falcon_drain_tx_fifo(struct efx_nic *efx)
{
efx_oword_t temp;
int count;
if ((falcon_rev(efx) < FALCON_REV_B0) ||
(efx->loopback_mode != LOOPBACK_NONE))
return;
falcon_read(efx, &temp, MAC0_CTRL_REG_KER);
/* There is no point in draining more than once */
if (EFX_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0))
return;
/* MAC stats will fail whilst the TX fifo is draining. Serialise
* the drain sequence with the statistics fetch */
spin_lock(&efx->stats_lock);
EFX_SET_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0, 1);
falcon_write(efx, &temp, MAC0_CTRL_REG_KER);
/* Reset the MAC and EM block. */
falcon_read(efx, &temp, GLB_CTL_REG_KER);
EFX_SET_OWORD_FIELD(temp, RST_XGTX, 1);
EFX_SET_OWORD_FIELD(temp, RST_XGRX, 1);
EFX_SET_OWORD_FIELD(temp, RST_EM, 1);
falcon_write(efx, &temp, GLB_CTL_REG_KER);
count = 0;
while (1) {
falcon_read(efx, &temp, GLB_CTL_REG_KER);
if (!EFX_OWORD_FIELD(temp, RST_XGTX) &&
!EFX_OWORD_FIELD(temp, RST_XGRX) &&
!EFX_OWORD_FIELD(temp, RST_EM)) {
EFX_LOG(efx, "Completed MAC reset after %d loops\n",
count);
break;
}
if (count > 20) {
EFX_ERR(efx, "MAC reset failed\n");
break;
}
count++;
udelay(10);
}
spin_unlock(&efx->stats_lock);
/* If we've reset the EM block and the link is up, then
* we'll have to kick the XAUI link so the PHY can recover */
if (efx->link_up && EFX_WORKAROUND_5147(efx))
falcon_reset_xaui(efx);
}
void falcon_deconfigure_mac_wrapper(struct efx_nic *efx)
{
efx_oword_t temp;
if (falcon_rev(efx) < FALCON_REV_B0)
return;
/* Isolate the MAC -> RX */
falcon_read(efx, &temp, RX_CFG_REG_KER);
EFX_SET_OWORD_FIELD(temp, RX_INGR_EN_B0, 0);
falcon_write(efx, &temp, RX_CFG_REG_KER);
if (!efx->link_up)
falcon_drain_tx_fifo(efx);
}
void falcon_reconfigure_mac_wrapper(struct efx_nic *efx)
{
efx_oword_t reg;
int link_speed;
unsigned int tx_fc;
if (efx->link_options & GM_LPA_10000)
link_speed = 0x3;
else if (efx->link_options & GM_LPA_1000)
link_speed = 0x2;
else if (efx->link_options & GM_LPA_100)
link_speed = 0x1;
else
link_speed = 0x0;
/* MAC_LINK_STATUS controls MAC backpressure but doesn't work
* as advertised. Disable to ensure packets are not
* indefinitely held and TX queue can be flushed at any point
* while the link is down. */
EFX_POPULATE_OWORD_5(reg,
MAC_XOFF_VAL, 0xffff /* max pause time */,
MAC_BCAD_ACPT, 1,
MAC_UC_PROM, efx->promiscuous,
MAC_LINK_STATUS, 1, /* always set */
MAC_SPEED, link_speed);
/* On B0, MAC backpressure can be disabled and packets get
* discarded. */
if (falcon_rev(efx) >= FALCON_REV_B0) {
EFX_SET_OWORD_FIELD(reg, TXFIFO_DRAIN_EN_B0,
!efx->link_up);
}
falcon_write(efx, ®, MAC0_CTRL_REG_KER);
/* Restore the multicast hash registers. */
falcon_set_multicast_hash(efx);
/* Transmission of pause frames when RX crosses the threshold is
* covered by RX_XOFF_MAC_EN and XM_TX_CFG_REG:XM_FCNTL.
* Action on receipt of pause frames is controller by XM_DIS_FCNTL */
tx_fc = (efx->flow_control & EFX_FC_TX) ? 1 : 0;
falcon_read(efx, ®, RX_CFG_REG_KER);
EFX_SET_OWORD_FIELD_VER(efx, reg, RX_XOFF_MAC_EN, tx_fc);
/* Unisolate the MAC -> RX */
if (falcon_rev(efx) >= FALCON_REV_B0)
EFX_SET_OWORD_FIELD(reg, RX_INGR_EN_B0, 1);
falcon_write(efx, ®, RX_CFG_REG_KER);
}
int falcon_dma_stats(struct efx_nic *efx, unsigned int done_offset)
{
efx_oword_t reg;
u32 *dma_done;
int i;
if (disable_dma_stats)
return 0;
/* Statistics fetch will fail if the MAC is in TX drain */
if (falcon_rev(efx) >= FALCON_REV_B0) {
efx_oword_t temp;
falcon_read(efx, &temp, MAC0_CTRL_REG_KER);
if (EFX_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0))
return 0;
}
dma_done = (efx->stats_buffer.addr + done_offset);
*dma_done = FALCON_STATS_NOT_DONE;
wmb(); /* ensure done flag is clear */
/* Initiate DMA transfer of stats */
EFX_POPULATE_OWORD_2(reg,
MAC_STAT_DMA_CMD, 1,
MAC_STAT_DMA_ADR,
efx->stats_buffer.dma_addr);
falcon_write(efx, ®, MAC0_STAT_DMA_REG_KER);
/* Wait for transfer to complete */
for (i = 0; i < 400; i++) {
if (*(volatile u32 *)dma_done == FALCON_STATS_DONE)
return 0;
udelay(10);
}
EFX_ERR(efx, "timed out waiting for statistics\n");
return -ETIMEDOUT;
}
/**************************************************************************
*
* PHY access via GMII
*
**************************************************************************
*/
/* Use the top bit of the MII PHY id to indicate the PHY type
* (1G/10G), with the remaining bits as the actual PHY id.
*
* This allows us to avoid leaking information from the mii_if_info
* structure into other data structures.
*/
#define FALCON_PHY_ID_ID_WIDTH EFX_WIDTH(MD_PRT_DEV_ADR)
#define FALCON_PHY_ID_ID_MASK ((1 << FALCON_PHY_ID_ID_WIDTH) - 1)
#define FALCON_PHY_ID_WIDTH (FALCON_PHY_ID_ID_WIDTH + 1)
#define FALCON_PHY_ID_MASK ((1 << FALCON_PHY_ID_WIDTH) - 1)
#define FALCON_PHY_ID_10G (1 << (FALCON_PHY_ID_WIDTH - 1))
/* Packing the clause 45 port and device fields into a single value */
#define MD_PRT_ADR_COMP_LBN (MD_PRT_ADR_LBN - MD_DEV_ADR_LBN)
#define MD_PRT_ADR_COMP_WIDTH MD_PRT_ADR_WIDTH
#define MD_DEV_ADR_COMP_LBN 0
#define MD_DEV_ADR_COMP_WIDTH MD_DEV_ADR_WIDTH
/* Wait for GMII access to complete */
static int falcon_gmii_wait(struct efx_nic *efx)
{
efx_dword_t md_stat;
int count;
for (count = 0; count < 1000; count++) { /* wait upto 10ms */
falcon_readl(efx, &md_stat, MD_STAT_REG_KER);
if (EFX_DWORD_FIELD(md_stat, MD_BSY) == 0) {
if (EFX_DWORD_FIELD(md_stat, MD_LNFL) != 0 ||
EFX_DWORD_FIELD(md_stat, MD_BSERR) != 0) {
EFX_ERR(efx, "error from GMII access "
EFX_DWORD_FMT"\n",
EFX_DWORD_VAL(md_stat));
return -EIO;
}
return 0;
}
udelay(10);
}
EFX_ERR(efx, "timed out waiting for GMII\n");
return -ETIMEDOUT;
}
/* Writes a GMII register of a PHY connected to Falcon using MDIO. */
static void falcon_mdio_write(struct net_device *net_dev, int phy_id,
int addr, int value)
{
struct efx_nic *efx = (struct efx_nic *)net_dev->priv;
unsigned int phy_id2 = phy_id & FALCON_PHY_ID_ID_MASK;
efx_oword_t reg;
/* The 'generic' prt/dev packing in mdio_10g.h is conveniently
* chosen so that the only current user, Falcon, can take the
* packed value and use them directly.
* Fail to build if this assumption is broken.
*/
BUILD_BUG_ON(FALCON_PHY_ID_10G != MDIO45_XPRT_ID_IS10G);
BUILD_BUG_ON(FALCON_PHY_ID_ID_WIDTH != MDIO45_PRT_DEV_WIDTH);
BUILD_BUG_ON(MD_PRT_ADR_COMP_LBN != MDIO45_PRT_ID_COMP_LBN);
BUILD_BUG_ON(MD_DEV_ADR_COMP_LBN != MDIO45_DEV_ID_COMP_LBN);
if (phy_id2 == PHY_ADDR_INVALID)
return;
/* See falcon_mdio_read for an explanation. */
if (!(phy_id & FALCON_PHY_ID_10G)) {
int mmd = ffs(efx->phy_op->mmds) - 1;
EFX_TRACE(efx, "Fixing erroneous clause22 write\n");
phy_id2 = mdio_clause45_pack(phy_id2, mmd)
& FALCON_PHY_ID_ID_MASK;
}
EFX_REGDUMP(efx, "writing GMII %d register %02x with %04x\n", phy_id,
addr, value);
spin_lock_bh(&efx->phy_lock);
/* Check MII not currently being accessed */
if (falcon_gmii_wait(efx) != 0)
goto out;
/* Write the address/ID register */
EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr);
falcon_write(efx, ®, MD_PHY_ADR_REG_KER);
EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_id2);
falcon_write(efx, ®, MD_ID_REG_KER);
/* Write data */
EFX_POPULATE_OWORD_1(reg, MD_TXD, value);
falcon_write(efx, ®, MD_TXD_REG_KER);
EFX_POPULATE_OWORD_2(reg,
MD_WRC, 1,
MD_GC, 0);
falcon_write(efx, ®, MD_CS_REG_KER);
/* Wait for data to be written */
if (falcon_gmii_wait(efx) != 0) {
/* Abort the write operation */
EFX_POPULATE_OWORD_2(reg,
MD_WRC, 0,
MD_GC, 1);
falcon_write(efx, ®, MD_CS_REG_KER);
udelay(10);
}
out:
spin_unlock_bh(&efx->phy_lock);
}
/* Reads a GMII register from a PHY connected to Falcon. If no value
* could be read, -1 will be returned. */
static int falcon_mdio_read(struct net_device *net_dev, int phy_id, int addr)
{
struct efx_nic *efx = (struct efx_nic *)net_dev->priv;
unsigned int phy_addr = phy_id & FALCON_PHY_ID_ID_MASK;
efx_oword_t reg;
int value = -1;
if (phy_addr == PHY_ADDR_INVALID)
return -1;
/* Our PHY code knows whether it needs to talk clause 22(1G) or 45(10G)
* but the generic Linux code does not make any distinction or have
* any state for this.
* We spot the case where someone tried to talk 22 to a 45 PHY and
* redirect the request to the lowest numbered MMD as a clause45
* request. This is enough to allow simple queries like id and link
* state to succeed. TODO: We may need to do more in future.
*/
if (!(phy_id & FALCON_PHY_ID_10G)) {
int mmd = ffs(efx->phy_op->mmds) - 1;
EFX_TRACE(efx, "Fixing erroneous clause22 read\n");
phy_addr = mdio_clause45_pack(phy_addr, mmd)
& FALCON_PHY_ID_ID_MASK;
}
spin_lock_bh(&efx->phy_lock);
/* Check MII not currently being accessed */
if (falcon_gmii_wait(efx) != 0)
goto out;
EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr);
falcon_write(efx, ®, MD_PHY_ADR_REG_KER);
EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_addr);
falcon_write(efx, ®, MD_ID_REG_KER);
/* Request data to be read */
EFX_POPULATE_OWORD_2(reg, MD_RDC, 1, MD_GC, 0);
falcon_write(efx, ®, MD_CS_REG_KER);
/* Wait for data to become available */
value = falcon_gmii_wait(efx);
if (value == 0) {
falcon_read(efx, ®, MD_RXD_REG_KER);
value = EFX_OWORD_FIELD(reg, MD_RXD);
EFX_REGDUMP(efx, "read from GMII %d register %02x, got %04x\n",
phy_id, addr, value);
} else {
/* Abort the read operation */
EFX_POPULATE_OWORD_2(reg,
MD_RIC, 0,
MD_GC, 1);
falcon_write(efx, ®, MD_CS_REG_KER);
EFX_LOG(efx, "read from GMII 0x%x register %02x, got "
"error %d\n", phy_id, addr, value);
}
out:
spin_unlock_bh(&efx->phy_lock);
return value;
}
static void falcon_init_mdio(struct mii_if_info *gmii)
{
gmii->mdio_read = falcon_mdio_read;
gmii->mdio_write = falcon_mdio_write;
gmii->phy_id_mask = FALCON_PHY_ID_MASK;
gmii->reg_num_mask = ((1 << EFX_WIDTH(MD_PHY_ADR)) - 1);
}
static int falcon_probe_phy(struct efx_nic *efx)
{
switch (efx->phy_type) {
case PHY_TYPE_10XPRESS:
efx->phy_op = &falcon_tenxpress_phy_ops;
break;
case PHY_TYPE_XFP:
efx->phy_op = &falcon_xfp_phy_ops;
break;
default:
EFX_ERR(efx, "Unknown PHY type %d\n",
efx->phy_type);
return -1;
}
efx->loopback_modes = LOOPBACKS_10G_INTERNAL | efx->phy_op->loopbacks;
return 0;
}
/* This call is responsible for hooking in the MAC and PHY operations */
int falcon_probe_port(struct efx_nic *efx)
{
int rc;
/* Hook in PHY operations table */
rc = falcon_probe_phy(efx);
if (rc)
return rc;
/* Set up GMII structure for PHY */
efx->mii.supports_gmii = 1;
falcon_init_mdio(&efx->mii);
/* Hardware flow ctrl. FalconA RX FIFO too small for pause generation */
if (falcon_rev(efx) >= FALCON_REV_B0)
efx->flow_control = EFX_FC_RX | EFX_FC_TX;
else
efx->flow_control = EFX_FC_RX;
/* Allocate buffer for stats */
rc = falcon_alloc_buffer(efx, &efx->stats_buffer,
FALCON_MAC_STATS_SIZE);
if (rc)
return rc;
EFX_LOG(efx, "stats buffer at %llx (virt %p phys %lx)\n",
(unsigned long long)efx->stats_buffer.dma_addr,
efx->stats_buffer.addr,
virt_to_phys(efx->stats_buffer.addr));
return 0;
}
void falcon_remove_port(struct efx_nic *efx)
{
falcon_free_buffer(efx, &efx->stats_buffer);
}
/**************************************************************************
*
* Multicast filtering
*
**************************************************************************
*/
void falcon_set_multicast_hash(struct efx_nic *efx)
{
union efx_multicast_hash *mc_hash = &efx->multicast_hash;
/* Broadcast packets go through the multicast hash filter.
* ether_crc_le() of the broadcast address is 0xbe2612ff
* so we always add bit 0xff to the mask.
*/
set_bit_le(0xff, mc_hash->byte);
falcon_write(efx, &mc_hash->oword[0], MAC_MCAST_HASH_REG0_KER);
falcon_write(efx, &mc_hash->oword[1], MAC_MCAST_HASH_REG1_KER);
}
/**************************************************************************
*
* Device reset
*
**************************************************************************
*/
/* Resets NIC to known state. This routine must be called in process
* context and is allowed to sleep. */
int falcon_reset_hw(struct efx_nic *efx, enum reset_type method)
{
struct falcon_nic_data *nic_data = efx->nic_data;
efx_oword_t glb_ctl_reg_ker;
int rc;
EFX_LOG(efx, "performing hardware reset (%d)\n", method);
/* Initiate device reset */
if (method == RESET_TYPE_WORLD) {
rc = pci_save_state(efx->pci_dev);
if (rc) {
EFX_ERR(efx, "failed to backup PCI state of primary "
"function prior to hardware reset\n");
goto fail1;
}
if (FALCON_IS_DUAL_FUNC(efx)) {
rc = pci_save_state(nic_data->pci_dev2);
if (rc) {
EFX_ERR(efx, "failed to backup PCI state of "
"secondary function prior to "
"hardware reset\n");
goto fail2;
}
}
EFX_POPULATE_OWORD_2(glb_ctl_reg_ker,
EXT_PHY_RST_DUR, 0x7,
SWRST, 1);
} else {
int reset_phy = (method == RESET_TYPE_INVISIBLE ?
EXCLUDE_FROM_RESET : 0);
EFX_POPULATE_OWORD_7(glb_ctl_reg_ker,
EXT_PHY_RST_CTL, reset_phy,
PCIE_CORE_RST_CTL, EXCLUDE_FROM_RESET,
PCIE_NSTCK_RST_CTL, EXCLUDE_FROM_RESET,
PCIE_SD_RST_CTL, EXCLUDE_FROM_RESET,
EE_RST_CTL, EXCLUDE_FROM_RESET,
EXT_PHY_RST_DUR, 0x7 /* 10ms */,
SWRST, 1);
}
falcon_write(efx, &glb_ctl_reg_ker, GLB_CTL_REG_KER);
EFX_LOG(efx, "waiting for hardware reset\n");
schedule_timeout_uninterruptible(HZ / 20);
/* Restore PCI configuration if needed */
if (method == RESET_TYPE_WORLD) {
if (FALCON_IS_DUAL_FUNC(efx)) {
rc = pci_restore_state(nic_data->pci_dev2);
if (rc) {
EFX_ERR(efx, "failed to restore PCI config for "
"the secondary function\n");
goto fail3;
}
}
rc = pci_restore_state(efx->pci_dev);
if (rc) {
EFX_ERR(efx, "failed to restore PCI config for the "
"primary function\n");
goto fail4;
}
EFX_LOG(efx, "successfully restored PCI config\n");
}
/* Assert that reset complete */
falcon_read(efx, &glb_ctl_reg_ker, GLB_CTL_REG_KER);
if (EFX_OWORD_FIELD(glb_ctl_reg_ker, SWRST) != 0) {
rc = -ETIMEDOUT;
EFX_ERR(efx, "timed out waiting for hardware reset\n");
goto fail5;
}
EFX_LOG(efx, "hardware reset complete\n");
return 0;
/* pci_save_state() and pci_restore_state() MUST be called in pairs */
fail2:
fail3:
pci_restore_state(efx->pci_dev);
fail1:
fail4:
fail5:
return rc;
}
/* Zeroes out the SRAM contents. This routine must be called in
* process context and is allowed to sleep.
*/
static int falcon_reset_sram(struct efx_nic *efx)
{
efx_oword_t srm_cfg_reg_ker, gpio_cfg_reg_ker;
int count;
/* Set the SRAM wake/sleep GPIO appropriately. */
falcon_read(efx, &gpio_cfg_reg_ker, GPIO_CTL_REG_KER);
EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, GPIO1_OEN, 1);
EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, GPIO1_OUT, 1);
falcon_write(efx, &gpio_cfg_reg_ker, GPIO_CTL_REG_KER);
/* Initiate SRAM reset */
EFX_POPULATE_OWORD_2(srm_cfg_reg_ker,
SRAM_OOB_BT_INIT_EN, 1,
SRM_NUM_BANKS_AND_BANK_SIZE, 0);
falcon_write(efx, &srm_cfg_reg_ker, SRM_CFG_REG_KER);
/* Wait for SRAM reset to complete */
count = 0;
do {
EFX_LOG(efx, "waiting for SRAM reset (attempt %d)...\n", count);
/* SRAM reset is slow; expect around 16ms */
schedule_timeout_uninterruptible(HZ / 50);
/* Check for reset complete */
falcon_read(efx, &srm_cfg_reg_ker, SRM_CFG_REG_KER);
if (!EFX_OWORD_FIELD(srm_cfg_reg_ker, SRAM_OOB_BT_INIT_EN)) {
EFX_LOG(efx, "SRAM reset complete\n");
return 0;
}
} while (++count < 20); /* wait upto 0.4 sec */
EFX_ERR(efx, "timed out waiting for SRAM reset\n");
return -ETIMEDOUT;
}
/* Extract non-volatile configuration */
static int falcon_probe_nvconfig(struct efx_nic *efx)
{
struct falcon_nvconfig *nvconfig;
efx_oword_t nic_stat;
int device_id;
unsigned addr_len;
size_t offset, len;
int magic_num, struct_ver, board_rev;
int rc;
/* Find the boot device. */
falcon_read(efx, &nic_stat, NIC_STAT_REG);
if (EFX_OWORD_FIELD(nic_stat, SF_PRST)) {
device_id = EE_SPI_FLASH;
addr_len = 3;
} else if (EFX_OWORD_FIELD(nic_stat, EE_PRST)) {
device_id = EE_SPI_EEPROM;
addr_len = 2;
} else {
return -ENODEV;
}
nvconfig = kmalloc(sizeof(*nvconfig), GFP_KERNEL);
/* Read the whole configuration structure into memory. */
for (offset = 0; offset < sizeof(*nvconfig); offset += len) {
len = min(sizeof(*nvconfig) - offset,
(size_t) FALCON_SPI_MAX_LEN);
rc = falcon_spi_read(efx, device_id, SPI_READ,
NVCONFIG_BASE + offset, addr_len,
(char *)nvconfig + offset, len);
if (rc)
goto out;
}
/* Read the MAC addresses */
memcpy(efx->mac_address, nvconfig->mac_address[0], ETH_ALEN);
/* Read the board configuration. */
magic_num = le16_to_cpu(nvconfig->board_magic_num);
struct_ver = le16_to_cpu(nvconfig->board_struct_ver);
if (magic_num != NVCONFIG_BOARD_MAGIC_NUM || struct_ver < 2) {
EFX_ERR(efx, "Non volatile memory bad magic=%x ver=%x "
"therefore using defaults\n", magic_num, struct_ver);
efx->phy_type = PHY_TYPE_NONE;
efx->mii.phy_id = PHY_ADDR_INVALID;
board_rev = 0;
} else {
struct falcon_nvconfig_board_v2 *v2 = &nvconfig->board_v2;
efx->phy_type = v2->port0_phy_type;
efx->mii.phy_id = v2->port0_phy_addr;
board_rev = le16_to_cpu(v2->board_revision);
}
EFX_LOG(efx, "PHY is %d phy_id %d\n", efx->phy_type, efx->mii.phy_id);
efx_set_board_info(efx, board_rev);
out:
kfree(nvconfig);
return rc;
}
/* Probe the NIC variant (revision, ASIC vs FPGA, function count, port
* count, port speed). Set workaround and feature flags accordingly.
*/
static int falcon_probe_nic_variant(struct efx_nic *efx)
{
efx_oword_t altera_build;
falcon_read(efx, &altera_build, ALTERA_BUILD_REG_KER);
if (EFX_OWORD_FIELD(altera_build, VER_ALL)) {
EFX_ERR(efx, "Falcon FPGA not supported\n");
return -ENODEV;
}
switch (falcon_rev(efx)) {
case FALCON_REV_A0:
case 0xff:
EFX_ERR(efx, "Falcon rev A0 not supported\n");
return -ENODEV;
case FALCON_REV_A1:{
efx_oword_t nic_stat;
falcon_read(efx, &nic_stat, NIC_STAT_REG);
if (EFX_OWORD_FIELD(nic_stat, STRAP_PCIE) == 0) {
EFX_ERR(efx, "Falcon rev A1 PCI-X not supported\n");
return -ENODEV;
}
if (!EFX_OWORD_FIELD(nic_stat, STRAP_10G)) {
EFX_ERR(efx, "1G mode not supported\n");
return -ENODEV;
}
break;
}
case FALCON_REV_B0:
break;
default:
EFX_ERR(efx, "Unknown Falcon rev %d\n", falcon_rev(efx));
return -ENODEV;
}
return 0;
}
int falcon_probe_nic(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data;
int rc;
/* Initialise I2C interface state */
efx->i2c.efx = efx;
efx->i2c.op = &falcon_i2c_bit_operations;
efx->i2c.sda = 1;
efx->i2c.scl = 1;
/* Allocate storage for hardware specific data */
nic_data = kzalloc(sizeof(*nic_data), GFP_KERNEL);
efx->nic_data = nic_data;
/* Determine number of ports etc. */
rc = falcon_probe_nic_variant(efx);
if (rc)
goto fail1;
/* Probe secondary function if expected */
if (FALCON_IS_DUAL_FUNC(efx)) {
struct pci_dev *dev = pci_dev_get(efx->pci_dev);
while ((dev = pci_get_device(EFX_VENDID_SFC, FALCON_A_S_DEVID,
dev))) {
if (dev->bus == efx->pci_dev->bus &&
dev->devfn == efx->pci_dev->devfn + 1) {
nic_data->pci_dev2 = dev;
break;
}
}
if (!nic_data->pci_dev2) {
EFX_ERR(efx, "failed to find secondary function\n");
rc = -ENODEV;
goto fail2;
}
}
/* Now we can reset the NIC */
rc = falcon_reset_hw(efx, RESET_TYPE_ALL);
if (rc) {
EFX_ERR(efx, "failed to reset NIC\n");
goto fail3;
}
/* Allocate memory for INT_KER */
rc = falcon_alloc_buffer(efx, &efx->irq_status, sizeof(efx_oword_t));
if (rc)
goto fail4;
BUG_ON(efx->irq_status.dma_addr & 0x0f);
EFX_LOG(efx, "INT_KER at %llx (virt %p phys %lx)\n",
(unsigned long long)efx->irq_status.dma_addr,
efx->irq_status.addr, virt_to_phys(efx->irq_status.addr));
/* Read in the non-volatile configuration */
rc = falcon_probe_nvconfig(efx);
if (rc)
goto fail5;
return 0;
fail5:
falcon_free_buffer(efx, &efx->irq_status);
fail4:
fail3:
if (nic_data->pci_dev2) {
pci_dev_put(nic_data->pci_dev2);
nic_data->pci_dev2 = NULL;
}
fail2:
fail1:
kfree(efx->nic_data);
return rc;
}
/* This call performs hardware-specific global initialisation, such as
* defining the descriptor cache sizes and number of RSS channels.
* It does not set up any buffers, descriptor rings or event queues.
*/
int falcon_init_nic(struct efx_nic *efx)
{
efx_oword_t temp;
unsigned thresh;
int rc;
/* Set up the address region register. This is only needed
* for the B0 FPGA, but since we are just pushing in the
* reset defaults this may as well be unconditional. */
EFX_POPULATE_OWORD_4(temp, ADR_REGION0, 0,
ADR_REGION1, (1 << 16),
ADR_REGION2, (2 << 16),
ADR_REGION3, (3 << 16));
falcon_write(efx, &temp, ADR_REGION_REG_KER);
/* Use on-chip SRAM */
falcon_read(efx, &temp, NIC_STAT_REG);
EFX_SET_OWORD_FIELD(temp, ONCHIP_SRAM, 1);
falcon_write(efx, &temp, NIC_STAT_REG);
/* Set buffer table mode */
EFX_POPULATE_OWORD_1(temp, BUF_TBL_MODE, BUF_TBL_MODE_FULL);
falcon_write(efx, &temp, BUF_TBL_CFG_REG_KER);
rc = falcon_reset_sram(efx);
if (rc)
return rc;
/* Set positions of descriptor caches in SRAM. */
EFX_POPULATE_OWORD_1(temp, SRM_TX_DC_BASE_ADR, TX_DC_BASE / 8);
falcon_write(efx, &temp, SRM_TX_DC_CFG_REG_KER);
EFX_POPULATE_OWORD_1(temp, SRM_RX_DC_BASE_ADR, RX_DC_BASE / 8);
falcon_write(efx, &temp, SRM_RX_DC_CFG_REG_KER);
/* Set TX descriptor cache size. */
BUILD_BUG_ON(TX_DC_ENTRIES != (16 << TX_DC_ENTRIES_ORDER));
EFX_POPULATE_OWORD_1(temp, TX_DC_SIZE, TX_DC_ENTRIES_ORDER);
falcon_write(efx, &temp, TX_DC_CFG_REG_KER);
/* Set RX descriptor cache size. Set low watermark to size-8, as
* this allows most efficient prefetching.
*/
BUILD_BUG_ON(RX_DC_ENTRIES != (16 << RX_DC_ENTRIES_ORDER));
EFX_POPULATE_OWORD_1(temp, RX_DC_SIZE, RX_DC_ENTRIES_ORDER);
falcon_write(efx, &temp, RX_DC_CFG_REG_KER);
EFX_POPULATE_OWORD_1(temp, RX_DC_PF_LWM, RX_DC_ENTRIES - 8);
falcon_write(efx, &temp, RX_DC_PF_WM_REG_KER);
/* Clear the parity enables on the TX data fifos as
* they produce false parity errors because of timing issues
*/
if (EFX_WORKAROUND_5129(efx)) {
falcon_read(efx, &temp, SPARE_REG_KER);
EFX_SET_OWORD_FIELD(temp, MEM_PERR_EN_TX_DATA, 0);
falcon_write(efx, &temp, SPARE_REG_KER);
}
/* Enable all the genuinely fatal interrupts. (They are still
* masked by the overall interrupt mask, controlled by
* falcon_interrupts()).
*
* Note: All other fatal interrupts are enabled
*/
EFX_POPULATE_OWORD_3(temp,
ILL_ADR_INT_KER_EN, 1,
RBUF_OWN_INT_KER_EN, 1,
TBUF_OWN_INT_KER_EN, 1);
EFX_INVERT_OWORD(temp);
falcon_write(efx, &temp, FATAL_INTR_REG_KER);
/* Set number of RSS queues for receive path. */
falcon_read(efx, &temp, RX_FILTER_CTL_REG);
if (falcon_rev(efx) >= FALCON_REV_B0)
EFX_SET_OWORD_FIELD(temp, NUM_KER, 0);
else
EFX_SET_OWORD_FIELD(temp, NUM_KER, efx->rss_queues - 1);
if (EFX_WORKAROUND_7244(efx)) {
EFX_SET_OWORD_FIELD(temp, UDP_FULL_SRCH_LIMIT, 8);
EFX_SET_OWORD_FIELD(temp, UDP_WILD_SRCH_LIMIT, 8);
EFX_SET_OWORD_FIELD(temp, TCP_FULL_SRCH_LIMIT, 8);
EFX_SET_OWORD_FIELD(temp, TCP_WILD_SRCH_LIMIT, 8);
}
falcon_write(efx, &temp, RX_FILTER_CTL_REG);
falcon_setup_rss_indir_table(efx);
/* Setup RX. Wait for descriptor is broken and must
* be disabled. RXDP recovery shouldn't be needed, but is.
*/
falcon_read(efx, &temp, RX_SELF_RST_REG_KER);
EFX_SET_OWORD_FIELD(temp, RX_NODESC_WAIT_DIS, 1);
EFX_SET_OWORD_FIELD(temp, RX_RECOVERY_EN, 1);
if (EFX_WORKAROUND_5583(efx))
EFX_SET_OWORD_FIELD(temp, RX_ISCSI_DIS, 1);
falcon_write(efx, &temp, RX_SELF_RST_REG_KER);
/* Disable the ugly timer-based TX DMA backoff and allow TX DMA to be
* controlled by the RX FIFO fill level. Set arbitration to one pkt/Q.
*/
falcon_read(efx, &temp, TX_CFG2_REG_KER);
EFX_SET_OWORD_FIELD(temp, TX_RX_SPACER, 0xfe);
EFX_SET_OWORD_FIELD(temp, TX_RX_SPACER_EN, 1);
EFX_SET_OWORD_FIELD(temp, TX_ONE_PKT_PER_Q, 1);
EFX_SET_OWORD_FIELD(temp, TX_CSR_PUSH_EN, 0);
EFX_SET_OWORD_FIELD(temp, TX_DIS_NON_IP_EV, 1);
/* Enable SW_EV to inherit in char driver - assume harmless here */
EFX_SET_OWORD_FIELD(temp, TX_SW_EV_EN, 1);
/* Prefetch threshold 2 => fetch when descriptor cache half empty */
EFX_SET_OWORD_FIELD(temp, TX_PREF_THRESHOLD, 2);
/* Squash TX of packets of 16 bytes or less */
if (falcon_rev(efx) >= FALCON_REV_B0 && EFX_WORKAROUND_9141(efx))
EFX_SET_OWORD_FIELD(temp, TX_FLUSH_MIN_LEN_EN_B0, 1);
falcon_write(efx, &temp, TX_CFG2_REG_KER);
/* Do not enable TX_NO_EOP_DISC_EN, since it limits packets to 16
* descriptors (which is bad).
*/
falcon_read(efx, &temp, TX_CFG_REG_KER);
EFX_SET_OWORD_FIELD(temp, TX_NO_EOP_DISC_EN, 0);
falcon_write(efx, &temp, TX_CFG_REG_KER);
/* RX config */
falcon_read(efx, &temp, RX_CFG_REG_KER);
EFX_SET_OWORD_FIELD_VER(efx, temp, RX_DESC_PUSH_EN, 0);
if (EFX_WORKAROUND_7575(efx))
EFX_SET_OWORD_FIELD_VER(efx, temp, RX_USR_BUF_SIZE,
(3 * 4096) / 32);
if (falcon_rev(efx) >= FALCON_REV_B0)
EFX_SET_OWORD_FIELD(temp, RX_INGR_EN_B0, 1);
/* RX FIFO flow control thresholds */
thresh = ((rx_xon_thresh_bytes >= 0) ?
rx_xon_thresh_bytes : efx->type->rx_xon_thresh);
EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XON_MAC_TH, thresh / 256);
thresh = ((rx_xoff_thresh_bytes >= 0) ?
rx_xoff_thresh_bytes : efx->type->rx_xoff_thresh);
EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XOFF_MAC_TH, thresh / 256);
/* RX control FIFO thresholds [32 entries] */
EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XON_TX_TH, 25);
EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XOFF_TX_TH, 20);
falcon_write(efx, &temp, RX_CFG_REG_KER);
/* Set destination of both TX and RX Flush events */
if (falcon_rev(efx) >= FALCON_REV_B0) {
EFX_POPULATE_OWORD_1(temp, FLS_EVQ_ID, 0);
falcon_write(efx, &temp, DP_CTRL_REG);
}
return 0;
}
void falcon_remove_nic(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
falcon_free_buffer(efx, &efx->irq_status);
falcon_reset_hw(efx, RESET_TYPE_ALL);
/* Release the second function after the reset */
if (nic_data->pci_dev2) {
pci_dev_put(nic_data->pci_dev2);
nic_data->pci_dev2 = NULL;
}
/* Tear down the private nic state */
kfree(efx->nic_data);
efx->nic_data = NULL;
}
void falcon_update_nic_stats(struct efx_nic *efx)
{
efx_oword_t cnt;
falcon_read(efx, &cnt, RX_NODESC_DROP_REG_KER);
efx->n_rx_nodesc_drop_cnt += EFX_OWORD_FIELD(cnt, RX_NODESC_DROP_CNT);
}
/**************************************************************************
*
* Revision-dependent attributes used by efx.c
*
**************************************************************************
*/
struct efx_nic_type falcon_a_nic_type = {
.mem_bar = 2,
.mem_map_size = 0x20000,
.txd_ptr_tbl_base = TX_DESC_PTR_TBL_KER_A1,
.rxd_ptr_tbl_base = RX_DESC_PTR_TBL_KER_A1,
.buf_tbl_base = BUF_TBL_KER_A1,
.evq_ptr_tbl_base = EVQ_PTR_TBL_KER_A1,
.evq_rptr_tbl_base = EVQ_RPTR_REG_KER_A1,
.txd_ring_mask = FALCON_TXD_RING_MASK,
.rxd_ring_mask = FALCON_RXD_RING_MASK,
.evq_size = FALCON_EVQ_SIZE,
.max_dma_mask = FALCON_DMA_MASK,
.tx_dma_mask = FALCON_TX_DMA_MASK,
.bug5391_mask = 0xf,
.rx_xoff_thresh = 2048,
.rx_xon_thresh = 512,
.rx_buffer_padding = 0x24,
.max_interrupt_mode = EFX_INT_MODE_MSI,
.phys_addr_channels = 4,
};
struct efx_nic_type falcon_b_nic_type = {
.mem_bar = 2,
/* Map everything up to and including the RSS indirection
* table. Don't map MSI-X table, MSI-X PBA since Linux
* requires that they not be mapped. */
.mem_map_size = RX_RSS_INDIR_TBL_B0 + 0x800,
.txd_ptr_tbl_base = TX_DESC_PTR_TBL_KER_B0,
.rxd_ptr_tbl_base = RX_DESC_PTR_TBL_KER_B0,
.buf_tbl_base = BUF_TBL_KER_B0,
.evq_ptr_tbl_base = EVQ_PTR_TBL_KER_B0,
.evq_rptr_tbl_base = EVQ_RPTR_REG_KER_B0,
.txd_ring_mask = FALCON_TXD_RING_MASK,
.rxd_ring_mask = FALCON_RXD_RING_MASK,
.evq_size = FALCON_EVQ_SIZE,
.max_dma_mask = FALCON_DMA_MASK,
.tx_dma_mask = FALCON_TX_DMA_MASK,
.bug5391_mask = 0,
.rx_xoff_thresh = 54272, /* ~80Kb - 3*max MTU */
.rx_xon_thresh = 27648, /* ~3*max MTU */
.rx_buffer_padding = 0,
.max_interrupt_mode = EFX_INT_MODE_MSIX,
.phys_addr_channels = 32, /* Hardware limit is 64, but the legacy
* interrupt handler only supports 32
* channels */
};
