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gve_main.c
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gve_main.c
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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/* Google virtual Ethernet (gve) driver
*
* Copyright (C) 2015-2019 Google, Inc.
*/
#include <linux/cpumask.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <net/sch_generic.h>
#include "gve.h"
#include "gve_adminq.h"
#include "gve_register.h"
#define GVE_DEFAULT_RX_COPYBREAK (256)
#define DEFAULT_MSG_LEVEL (NETIF_MSG_DRV | NETIF_MSG_LINK)
#define GVE_VERSION "1.0.0"
#define GVE_VERSION_PREFIX "GVE-"
// Minimum amount of time between queue kicks in msec (10 seconds)
#define MIN_TX_TIMEOUT_GAP (1000 * 10)
const char gve_version_str[] = GVE_VERSION;
static const char gve_version_prefix[] = GVE_VERSION_PREFIX;
static void gve_get_stats(struct net_device *dev, struct rtnl_link_stats64 *s)
{
struct gve_priv *priv = netdev_priv(dev);
unsigned int start;
u64 packets, bytes;
int ring;
if (priv->rx) {
for (ring = 0; ring < priv->rx_cfg.num_queues; ring++) {
do {
start =
u64_stats_fetch_begin(&priv->rx[ring].statss);
packets = priv->rx[ring].rpackets;
bytes = priv->rx[ring].rbytes;
} while (u64_stats_fetch_retry(&priv->rx[ring].statss,
start));
s->rx_packets += packets;
s->rx_bytes += bytes;
}
}
if (priv->tx) {
for (ring = 0; ring < priv->tx_cfg.num_queues; ring++) {
do {
start =
u64_stats_fetch_begin(&priv->tx[ring].statss);
packets = priv->tx[ring].pkt_done;
bytes = priv->tx[ring].bytes_done;
} while (u64_stats_fetch_retry(&priv->tx[ring].statss,
start));
s->tx_packets += packets;
s->tx_bytes += bytes;
}
}
}
static int gve_alloc_counter_array(struct gve_priv *priv)
{
priv->counter_array =
dma_alloc_coherent(&priv->pdev->dev,
priv->num_event_counters *
sizeof(*priv->counter_array),
&priv->counter_array_bus, GFP_KERNEL);
if (!priv->counter_array)
return -ENOMEM;
return 0;
}
static void gve_free_counter_array(struct gve_priv *priv)
{
if (!priv->counter_array)
return;
dma_free_coherent(&priv->pdev->dev,
priv->num_event_counters *
sizeof(*priv->counter_array),
priv->counter_array, priv->counter_array_bus);
priv->counter_array = NULL;
}
/* NIC requests to report stats */
static void gve_stats_report_task(struct work_struct *work)
{
struct gve_priv *priv = container_of(work, struct gve_priv,
stats_report_task);
if (gve_get_do_report_stats(priv)) {
gve_handle_report_stats(priv);
gve_clear_do_report_stats(priv);
}
}
static void gve_stats_report_schedule(struct gve_priv *priv)
{
if (!gve_get_probe_in_progress(priv) &&
!gve_get_reset_in_progress(priv)) {
gve_set_do_report_stats(priv);
queue_work(priv->gve_wq, &priv->stats_report_task);
}
}
static void gve_stats_report_timer(struct timer_list *t)
{
struct gve_priv *priv = from_timer(priv, t, stats_report_timer);
mod_timer(&priv->stats_report_timer,
round_jiffies(jiffies +
msecs_to_jiffies(priv->stats_report_timer_period)));
gve_stats_report_schedule(priv);
}
static int gve_alloc_stats_report(struct gve_priv *priv)
{
int tx_stats_num, rx_stats_num;
tx_stats_num = (GVE_TX_STATS_REPORT_NUM + NIC_TX_STATS_REPORT_NUM) *
priv->tx_cfg.num_queues;
rx_stats_num = (GVE_RX_STATS_REPORT_NUM + NIC_RX_STATS_REPORT_NUM) *
priv->rx_cfg.num_queues;
priv->stats_report_len = struct_size(priv->stats_report, stats,
tx_stats_num + rx_stats_num);
priv->stats_report =
dma_alloc_coherent(&priv->pdev->dev, priv->stats_report_len,
&priv->stats_report_bus, GFP_KERNEL);
if (!priv->stats_report)
return -ENOMEM;
/* Set up timer for the report-stats task */
timer_setup(&priv->stats_report_timer, gve_stats_report_timer, 0);
priv->stats_report_timer_period = GVE_STATS_REPORT_TIMER_PERIOD;
return 0;
}
static void gve_free_stats_report(struct gve_priv *priv)
{
if (!priv->stats_report)
return;
del_timer_sync(&priv->stats_report_timer);
dma_free_coherent(&priv->pdev->dev, priv->stats_report_len,
priv->stats_report, priv->stats_report_bus);
priv->stats_report = NULL;
}
static irqreturn_t gve_mgmnt_intr(int irq, void *arg)
{
struct gve_priv *priv = arg;
queue_work(priv->gve_wq, &priv->service_task);
return IRQ_HANDLED;
}
static irqreturn_t gve_intr(int irq, void *arg)
{
struct gve_notify_block *block = arg;
struct gve_priv *priv = block->priv;
iowrite32be(GVE_IRQ_MASK, gve_irq_doorbell(priv, block));
napi_schedule_irqoff(&block->napi);
return IRQ_HANDLED;
}
static int gve_napi_poll(struct napi_struct *napi, int budget)
{
struct gve_notify_block *block;
__be32 __iomem *irq_doorbell;
bool reschedule = false;
struct gve_priv *priv;
block = container_of(napi, struct gve_notify_block, napi);
priv = block->priv;
if (block->tx)
reschedule |= gve_tx_poll(block, budget);
if (block->rx)
reschedule |= gve_rx_poll(block, budget);
if (reschedule)
return budget;
napi_complete(napi);
irq_doorbell = gve_irq_doorbell(priv, block);
iowrite32be(GVE_IRQ_ACK | GVE_IRQ_EVENT, irq_doorbell);
/* Double check we have no extra work.
* Ensure unmask synchronizes with checking for work.
*/
mb();
if (block->tx)
reschedule |= gve_tx_poll(block, -1);
if (block->rx)
reschedule |= gve_rx_poll(block, -1);
if (reschedule && napi_reschedule(napi))
iowrite32be(GVE_IRQ_MASK, irq_doorbell);
return 0;
}
static int gve_alloc_notify_blocks(struct gve_priv *priv)
{
int num_vecs_requested = priv->num_ntfy_blks + 1;
char *name = priv->dev->name;
unsigned int active_cpus;
int vecs_enabled;
int i, j;
int err;
priv->msix_vectors = kvzalloc(num_vecs_requested *
sizeof(*priv->msix_vectors), GFP_KERNEL);
if (!priv->msix_vectors)
return -ENOMEM;
for (i = 0; i < num_vecs_requested; i++)
priv->msix_vectors[i].entry = i;
vecs_enabled = pci_enable_msix_range(priv->pdev, priv->msix_vectors,
GVE_MIN_MSIX, num_vecs_requested);
if (vecs_enabled < 0) {
dev_err(&priv->pdev->dev, "Could not enable min msix %d/%d\n",
GVE_MIN_MSIX, vecs_enabled);
err = vecs_enabled;
goto abort_with_msix_vectors;
}
if (vecs_enabled != num_vecs_requested) {
int new_num_ntfy_blks = (vecs_enabled - 1) & ~0x1;
int vecs_per_type = new_num_ntfy_blks / 2;
int vecs_left = new_num_ntfy_blks % 2;
priv->num_ntfy_blks = new_num_ntfy_blks;
priv->mgmt_msix_idx = priv->num_ntfy_blks;
priv->tx_cfg.max_queues = min_t(int, priv->tx_cfg.max_queues,
vecs_per_type);
priv->rx_cfg.max_queues = min_t(int, priv->rx_cfg.max_queues,
vecs_per_type + vecs_left);
dev_err(&priv->pdev->dev,
"Could not enable desired msix, only enabled %d, adjusting tx max queues to %d, and rx max queues to %d\n",
vecs_enabled, priv->tx_cfg.max_queues,
priv->rx_cfg.max_queues);
if (priv->tx_cfg.num_queues > priv->tx_cfg.max_queues)
priv->tx_cfg.num_queues = priv->tx_cfg.max_queues;
if (priv->rx_cfg.num_queues > priv->rx_cfg.max_queues)
priv->rx_cfg.num_queues = priv->rx_cfg.max_queues;
}
/* Half the notification blocks go to TX and half to RX */
active_cpus = min_t(int, priv->num_ntfy_blks / 2, num_online_cpus());
/* Setup Management Vector - the last vector */
snprintf(priv->mgmt_msix_name, sizeof(priv->mgmt_msix_name), "%s-mgmnt",
name);
err = request_irq(priv->msix_vectors[priv->mgmt_msix_idx].vector,
gve_mgmnt_intr, 0, priv->mgmt_msix_name, priv);
if (err) {
dev_err(&priv->pdev->dev, "Did not receive management vector.\n");
goto abort_with_msix_enabled;
}
priv->ntfy_blocks =
dma_alloc_coherent(&priv->pdev->dev,
priv->num_ntfy_blks *
sizeof(*priv->ntfy_blocks),
&priv->ntfy_block_bus, GFP_KERNEL);
if (!priv->ntfy_blocks) {
err = -ENOMEM;
goto abort_with_mgmt_vector;
}
/* Setup the other blocks - the first n-1 vectors */
for (i = 0; i < priv->num_ntfy_blks; i++) {
struct gve_notify_block *block = &priv->ntfy_blocks[i];
int msix_idx = i;
snprintf(block->name, sizeof(block->name), "%s-ntfy-block.%d",
name, i);
block->priv = priv;
err = request_irq(priv->msix_vectors[msix_idx].vector,
gve_intr, 0, block->name, block);
if (err) {
dev_err(&priv->pdev->dev,
"Failed to receive msix vector %d\n", i);
goto abort_with_some_ntfy_blocks;
}
irq_set_affinity_hint(priv->msix_vectors[msix_idx].vector,
get_cpu_mask(i % active_cpus));
}
return 0;
abort_with_some_ntfy_blocks:
for (j = 0; j < i; j++) {
struct gve_notify_block *block = &priv->ntfy_blocks[j];
int msix_idx = j;
irq_set_affinity_hint(priv->msix_vectors[msix_idx].vector,
NULL);
free_irq(priv->msix_vectors[msix_idx].vector, block);
}
dma_free_coherent(&priv->pdev->dev, priv->num_ntfy_blks *
sizeof(*priv->ntfy_blocks),
priv->ntfy_blocks, priv->ntfy_block_bus);
priv->ntfy_blocks = NULL;
abort_with_mgmt_vector:
free_irq(priv->msix_vectors[priv->mgmt_msix_idx].vector, priv);
abort_with_msix_enabled:
pci_disable_msix(priv->pdev);
abort_with_msix_vectors:
kvfree(priv->msix_vectors);
priv->msix_vectors = NULL;
return err;
}
static void gve_free_notify_blocks(struct gve_priv *priv)
{
int i;
if (!priv->msix_vectors)
return;
/* Free the irqs */
for (i = 0; i < priv->num_ntfy_blks; i++) {
struct gve_notify_block *block = &priv->ntfy_blocks[i];
int msix_idx = i;
irq_set_affinity_hint(priv->msix_vectors[msix_idx].vector,
NULL);
free_irq(priv->msix_vectors[msix_idx].vector, block);
}
free_irq(priv->msix_vectors[priv->mgmt_msix_idx].vector, priv);
dma_free_coherent(&priv->pdev->dev,
priv->num_ntfy_blks * sizeof(*priv->ntfy_blocks),
priv->ntfy_blocks, priv->ntfy_block_bus);
priv->ntfy_blocks = NULL;
pci_disable_msix(priv->pdev);
kvfree(priv->msix_vectors);
priv->msix_vectors = NULL;
}
static int gve_setup_device_resources(struct gve_priv *priv)
{
int err;
err = gve_alloc_counter_array(priv);
if (err)
return err;
err = gve_alloc_notify_blocks(priv);
if (err)
goto abort_with_counter;
err = gve_alloc_stats_report(priv);
if (err)
goto abort_with_ntfy_blocks;
err = gve_adminq_configure_device_resources(priv,
priv->counter_array_bus,
priv->num_event_counters,
priv->ntfy_block_bus,
priv->num_ntfy_blks);
if (unlikely(err)) {
dev_err(&priv->pdev->dev,
"could not setup device_resources: err=%d\n", err);
err = -ENXIO;
goto abort_with_stats_report;
}
err = gve_adminq_report_stats(priv, priv->stats_report_len,
priv->stats_report_bus,
GVE_STATS_REPORT_TIMER_PERIOD);
if (err)
dev_err(&priv->pdev->dev,
"Failed to report stats: err=%d\n", err);
gve_set_device_resources_ok(priv);
return 0;
abort_with_stats_report:
gve_free_stats_report(priv);
abort_with_ntfy_blocks:
gve_free_notify_blocks(priv);
abort_with_counter:
gve_free_counter_array(priv);
return err;
}
static void gve_trigger_reset(struct gve_priv *priv);
static void gve_teardown_device_resources(struct gve_priv *priv)
{
int err;
/* Tell device its resources are being freed */
if (gve_get_device_resources_ok(priv)) {
/* detach the stats report */
err = gve_adminq_report_stats(priv, 0, 0x0, GVE_STATS_REPORT_TIMER_PERIOD);
if (err) {
dev_err(&priv->pdev->dev,
"Failed to detach stats report: err=%d\n", err);
gve_trigger_reset(priv);
}
err = gve_adminq_deconfigure_device_resources(priv);
if (err) {
dev_err(&priv->pdev->dev,
"Could not deconfigure device resources: err=%d\n",
err);
gve_trigger_reset(priv);
}
}
gve_free_counter_array(priv);
gve_free_notify_blocks(priv);
gve_free_stats_report(priv);
gve_clear_device_resources_ok(priv);
}
static void gve_add_napi(struct gve_priv *priv, int ntfy_idx)
{
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
netif_napi_add(priv->dev, &block->napi, gve_napi_poll,
NAPI_POLL_WEIGHT);
}
static void gve_remove_napi(struct gve_priv *priv, int ntfy_idx)
{
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
netif_napi_del(&block->napi);
}
static int gve_register_qpls(struct gve_priv *priv)
{
int num_qpls = gve_num_tx_qpls(priv) + gve_num_rx_qpls(priv);
int err;
int i;
for (i = 0; i < num_qpls; i++) {
err = gve_adminq_register_page_list(priv, &priv->qpls[i]);
if (err) {
netif_err(priv, drv, priv->dev,
"failed to register queue page list %d\n",
priv->qpls[i].id);
/* This failure will trigger a reset - no need to clean
* up
*/
return err;
}
}
return 0;
}
static int gve_unregister_qpls(struct gve_priv *priv)
{
int num_qpls = gve_num_tx_qpls(priv) + gve_num_rx_qpls(priv);
int err;
int i;
for (i = 0; i < num_qpls; i++) {
err = gve_adminq_unregister_page_list(priv, priv->qpls[i].id);
/* This failure will trigger a reset - no need to clean up */
if (err) {
netif_err(priv, drv, priv->dev,
"Failed to unregister queue page list %d\n",
priv->qpls[i].id);
return err;
}
}
return 0;
}
static int gve_create_rings(struct gve_priv *priv)
{
int err;
int i;
err = gve_adminq_create_tx_queues(priv, priv->tx_cfg.num_queues);
if (err) {
netif_err(priv, drv, priv->dev, "failed to create %d tx queues\n",
priv->tx_cfg.num_queues);
/* This failure will trigger a reset - no need to clean
* up
*/
return err;
}
netif_dbg(priv, drv, priv->dev, "created %d tx queues\n",
priv->tx_cfg.num_queues);
err = gve_adminq_create_rx_queues(priv, priv->rx_cfg.num_queues);
if (err) {
netif_err(priv, drv, priv->dev, "failed to create %d rx queues\n",
priv->rx_cfg.num_queues);
/* This failure will trigger a reset - no need to clean
* up
*/
return err;
}
netif_dbg(priv, drv, priv->dev, "created %d rx queues\n",
priv->rx_cfg.num_queues);
/* Rx data ring has been prefilled with packet buffers at queue
* allocation time.
* Write the doorbell to provide descriptor slots and packet buffers
* to the NIC.
*/
for (i = 0; i < priv->rx_cfg.num_queues; i++)
gve_rx_write_doorbell(priv, &priv->rx[i]);
return 0;
}
static int gve_alloc_rings(struct gve_priv *priv)
{
int ntfy_idx;
int err;
int i;
/* Setup tx rings */
priv->tx = kvzalloc(priv->tx_cfg.num_queues * sizeof(*priv->tx),
GFP_KERNEL);
if (!priv->tx)
return -ENOMEM;
err = gve_tx_alloc_rings(priv);
if (err)
goto free_tx;
/* Setup rx rings */
priv->rx = kvzalloc(priv->rx_cfg.num_queues * sizeof(*priv->rx),
GFP_KERNEL);
if (!priv->rx) {
err = -ENOMEM;
goto free_tx_queue;
}
err = gve_rx_alloc_rings(priv);
if (err)
goto free_rx;
/* Add tx napi & init sync stats*/
for (i = 0; i < priv->tx_cfg.num_queues; i++) {
u64_stats_init(&priv->tx[i].statss);
ntfy_idx = gve_tx_idx_to_ntfy(priv, i);
gve_add_napi(priv, ntfy_idx);
}
/* Add rx napi & init sync stats*/
for (i = 0; i < priv->rx_cfg.num_queues; i++) {
u64_stats_init(&priv->rx[i].statss);
ntfy_idx = gve_rx_idx_to_ntfy(priv, i);
gve_add_napi(priv, ntfy_idx);
}
return 0;
free_rx:
kvfree(priv->rx);
priv->rx = NULL;
free_tx_queue:
gve_tx_free_rings(priv);
free_tx:
kvfree(priv->tx);
priv->tx = NULL;
return err;
}
static int gve_destroy_rings(struct gve_priv *priv)
{
int err;
err = gve_adminq_destroy_tx_queues(priv, priv->tx_cfg.num_queues);
if (err) {
netif_err(priv, drv, priv->dev,
"failed to destroy tx queues\n");
/* This failure will trigger a reset - no need to clean up */
return err;
}
netif_dbg(priv, drv, priv->dev, "destroyed tx queues\n");
err = gve_adminq_destroy_rx_queues(priv, priv->rx_cfg.num_queues);
if (err) {
netif_err(priv, drv, priv->dev,
"failed to destroy rx queues\n");
/* This failure will trigger a reset - no need to clean up */
return err;
}
netif_dbg(priv, drv, priv->dev, "destroyed rx queues\n");
return 0;
}
static void gve_free_rings(struct gve_priv *priv)
{
int ntfy_idx;
int i;
if (priv->tx) {
for (i = 0; i < priv->tx_cfg.num_queues; i++) {
ntfy_idx = gve_tx_idx_to_ntfy(priv, i);
gve_remove_napi(priv, ntfy_idx);
}
gve_tx_free_rings(priv);
kvfree(priv->tx);
priv->tx = NULL;
}
if (priv->rx) {
for (i = 0; i < priv->rx_cfg.num_queues; i++) {
ntfy_idx = gve_rx_idx_to_ntfy(priv, i);
gve_remove_napi(priv, ntfy_idx);
}
gve_rx_free_rings(priv);
kvfree(priv->rx);
priv->rx = NULL;
}
}
int gve_alloc_page(struct gve_priv *priv, struct device *dev,
struct page **page, dma_addr_t *dma,
enum dma_data_direction dir)
{
*page = alloc_page(GFP_KERNEL);
if (!*page) {
priv->page_alloc_fail++;
return -ENOMEM;
}
*dma = dma_map_page(dev, *page, 0, PAGE_SIZE, dir);
if (dma_mapping_error(dev, *dma)) {
priv->dma_mapping_error++;
put_page(*page);
return -ENOMEM;
}
return 0;
}
static int gve_alloc_queue_page_list(struct gve_priv *priv, u32 id,
int pages)
{
struct gve_queue_page_list *qpl = &priv->qpls[id];
int err;
int i;
if (pages + priv->num_registered_pages > priv->max_registered_pages) {
netif_err(priv, drv, priv->dev,
"Reached max number of registered pages %llu > %llu\n",
pages + priv->num_registered_pages,
priv->max_registered_pages);
return -EINVAL;
}
qpl->id = id;
qpl->num_entries = 0;
qpl->pages = kvzalloc(pages * sizeof(*qpl->pages), GFP_KERNEL);
/* caller handles clean up */
if (!qpl->pages)
return -ENOMEM;
qpl->page_buses = kvzalloc(pages * sizeof(*qpl->page_buses),
GFP_KERNEL);
/* caller handles clean up */
if (!qpl->page_buses)
return -ENOMEM;
for (i = 0; i < pages; i++) {
err = gve_alloc_page(priv, &priv->pdev->dev, &qpl->pages[i],
&qpl->page_buses[i],
gve_qpl_dma_dir(priv, id));
/* caller handles clean up */
if (err)
return -ENOMEM;
qpl->num_entries++;
}
priv->num_registered_pages += pages;
return 0;
}
void gve_free_page(struct device *dev, struct page *page, dma_addr_t dma,
enum dma_data_direction dir)
{
if (!dma_mapping_error(dev, dma))
dma_unmap_page(dev, dma, PAGE_SIZE, dir);
if (page)
put_page(page);
}
static void gve_free_queue_page_list(struct gve_priv *priv,
int id)
{
struct gve_queue_page_list *qpl = &priv->qpls[id];
int i;
if (!qpl->pages)
return;
if (!qpl->page_buses)
goto free_pages;
for (i = 0; i < qpl->num_entries; i++)
gve_free_page(&priv->pdev->dev, qpl->pages[i],
qpl->page_buses[i], gve_qpl_dma_dir(priv, id));
kvfree(qpl->page_buses);
free_pages:
kvfree(qpl->pages);
priv->num_registered_pages -= qpl->num_entries;
}
static int gve_alloc_qpls(struct gve_priv *priv)
{
int num_qpls = gve_num_tx_qpls(priv) + gve_num_rx_qpls(priv);
int i, j;
int err;
priv->qpls = kvzalloc(num_qpls * sizeof(*priv->qpls), GFP_KERNEL);
if (!priv->qpls)
return -ENOMEM;
for (i = 0; i < gve_num_tx_qpls(priv); i++) {
err = gve_alloc_queue_page_list(priv, i,
priv->tx_pages_per_qpl);
if (err)
goto free_qpls;
}
for (; i < num_qpls; i++) {
err = gve_alloc_queue_page_list(priv, i,
priv->rx_pages_per_qpl);
if (err)
goto free_qpls;
}
priv->qpl_cfg.qpl_map_size = BITS_TO_LONGS(num_qpls) *
sizeof(unsigned long) * BITS_PER_BYTE;
priv->qpl_cfg.qpl_id_map = kvzalloc(BITS_TO_LONGS(num_qpls) *
sizeof(unsigned long), GFP_KERNEL);
if (!priv->qpl_cfg.qpl_id_map) {
err = -ENOMEM;
goto free_qpls;
}
return 0;
free_qpls:
for (j = 0; j <= i; j++)
gve_free_queue_page_list(priv, j);
kvfree(priv->qpls);
return err;
}
static void gve_free_qpls(struct gve_priv *priv)
{
int num_qpls = gve_num_tx_qpls(priv) + gve_num_rx_qpls(priv);
int i;
kvfree(priv->qpl_cfg.qpl_id_map);
for (i = 0; i < num_qpls; i++)
gve_free_queue_page_list(priv, i);
kvfree(priv->qpls);
}
/* Use this to schedule a reset when the device is capable of continuing
* to handle other requests in its current state. If it is not, do a reset
* in thread instead.
*/
void gve_schedule_reset(struct gve_priv *priv)
{
gve_set_do_reset(priv);
queue_work(priv->gve_wq, &priv->service_task);
}
static void gve_reset_and_teardown(struct gve_priv *priv, bool was_up);
static int gve_reset_recovery(struct gve_priv *priv, bool was_up);
static void gve_turndown(struct gve_priv *priv);
static void gve_turnup(struct gve_priv *priv);
static int gve_open(struct net_device *dev)
{
struct gve_priv *priv = netdev_priv(dev);
int err;
err = gve_alloc_qpls(priv);
if (err)
return err;
err = gve_alloc_rings(priv);
if (err)
goto free_qpls;
err = netif_set_real_num_tx_queues(dev, priv->tx_cfg.num_queues);
if (err)
goto free_rings;
err = netif_set_real_num_rx_queues(dev, priv->rx_cfg.num_queues);
if (err)
goto free_rings;
err = gve_register_qpls(priv);
if (err)
goto reset;
err = gve_create_rings(priv);
if (err)
goto reset;
gve_set_device_rings_ok(priv);
if (gve_get_report_stats(priv))
mod_timer(&priv->stats_report_timer,
round_jiffies(jiffies +
msecs_to_jiffies(priv->stats_report_timer_period)));
gve_turnup(priv);
queue_work(priv->gve_wq, &priv->service_task);
priv->interface_up_cnt++;
return 0;
free_rings:
gve_free_rings(priv);
free_qpls:
gve_free_qpls(priv);
return err;
reset:
/* This must have been called from a reset due to the rtnl lock
* so just return at this point.
*/
if (gve_get_reset_in_progress(priv))
return err;
/* Otherwise reset before returning */
gve_reset_and_teardown(priv, true);
/* if this fails there is nothing we can do so just ignore the return */
gve_reset_recovery(priv, false);
/* return the original error */
return err;
}
static int gve_close(struct net_device *dev)
{
struct gve_priv *priv = netdev_priv(dev);
int err;
netif_carrier_off(dev);
if (gve_get_device_rings_ok(priv)) {
gve_turndown(priv);
err = gve_destroy_rings(priv);
if (err)
goto err;
err = gve_unregister_qpls(priv);
if (err)
goto err;
gve_clear_device_rings_ok(priv);
}
del_timer_sync(&priv->stats_report_timer);
gve_free_rings(priv);
gve_free_qpls(priv);
priv->interface_down_cnt++;
return 0;
err:
/* This must have been called from a reset due to the rtnl lock
* so just return at this point.
*/
if (gve_get_reset_in_progress(priv))
return err;
/* Otherwise reset before returning */
gve_reset_and_teardown(priv, true);
return gve_reset_recovery(priv, false);
}
int gve_adjust_queues(struct gve_priv *priv,
struct gve_queue_config new_rx_config,
struct gve_queue_config new_tx_config)
{
int err;
if (netif_carrier_ok(priv->dev)) {
/* To make this process as simple as possible we teardown the
* device, set the new configuration, and then bring the device
* up again.
*/
err = gve_close(priv->dev);
/* we have already tried to reset in close,
* just fail at this point
*/
if (err)
return err;
priv->tx_cfg = new_tx_config;
priv->rx_cfg = new_rx_config;
err = gve_open(priv->dev);
if (err)
goto err;
return 0;
}
/* Set the config for the next up. */
priv->tx_cfg = new_tx_config;
priv->rx_cfg = new_rx_config;
return 0;
err:
netif_err(priv, drv, priv->dev,
"Adjust queues failed! !!! DISABLING ALL QUEUES !!!\n");
gve_turndown(priv);
return err;
}
static void gve_turndown(struct gve_priv *priv)
{
int idx;
if (netif_carrier_ok(priv->dev))
netif_carrier_off(priv->dev);
if (!gve_get_napi_enabled(priv))
return;
/* Disable napi to prevent more work from coming in */
for (idx = 0; idx < priv->tx_cfg.num_queues; idx++) {
int ntfy_idx = gve_tx_idx_to_ntfy(priv, idx);
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
napi_disable(&block->napi);
}
for (idx = 0; idx < priv->rx_cfg.num_queues; idx++) {
int ntfy_idx = gve_rx_idx_to_ntfy(priv, idx);
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
napi_disable(&block->napi);
}
/* Stop tx queues */
netif_tx_disable(priv->dev);
gve_clear_napi_enabled(priv);
gve_clear_report_stats(priv);
}
static void gve_turnup(struct gve_priv *priv)
{
int idx;
/* Start the tx queues */
netif_tx_start_all_queues(priv->dev);
/* Enable napi and unmask interrupts for all queues */
for (idx = 0; idx < priv->tx_cfg.num_queues; idx++) {
int ntfy_idx = gve_tx_idx_to_ntfy(priv, idx);
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
napi_enable(&block->napi);
iowrite32be(0, gve_irq_doorbell(priv, block));
}
for (idx = 0; idx < priv->rx_cfg.num_queues; idx++) {
int ntfy_idx = gve_rx_idx_to_ntfy(priv, idx);
struct gve_notify_block *block = &priv->ntfy_blocks[ntfy_idx];
napi_enable(&block->napi);
iowrite32be(0, gve_irq_doorbell(priv, block));
}
gve_set_napi_enabled(priv);
}
static void gve_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
struct gve_notify_block *block;
struct gve_tx_ring *tx = NULL;
struct gve_priv *priv;
u32 last_nic_done;
u32 current_time;
u32 ntfy_idx;
netdev_info(dev, "Timeout on tx queue, %d", txqueue);
priv = netdev_priv(dev);
if (txqueue > priv->tx_cfg.num_queues)
goto reset;
ntfy_idx = gve_tx_idx_to_ntfy(priv, txqueue);
if (ntfy_idx >= priv->num_ntfy_blks)
goto reset;
block = &priv->ntfy_blocks[ntfy_idx];
tx = block->tx;
current_time = jiffies_to_msecs(jiffies);
if (tx->last_kick_msec + MIN_TX_TIMEOUT_GAP > current_time)
goto reset;
/* Check to see if there are missed completions, which will allow us to
* kick the queue.
*/
last_nic_done = gve_tx_load_event_counter(priv, tx);
if (last_nic_done - tx->done) {
netdev_info(dev, "Kicking queue %d", txqueue);
iowrite32be(GVE_IRQ_MASK, gve_irq_doorbell(priv, block));
napi_schedule(&block->napi);
tx->last_kick_msec = current_time;
goto out;
} // Else reset.
reset:
gve_schedule_reset(priv);
out:
if (tx)
tx->queue_timeout++;
priv->tx_timeo_cnt++;
}
static const struct net_device_ops gve_netdev_ops = {
.ndo_start_xmit = gve_tx,
.ndo_open = gve_open,
.ndo_stop = gve_close,
.ndo_get_stats64 = gve_get_stats,
.ndo_tx_timeout = gve_tx_timeout,
};