#define ENA_MMIO_READ_TIMEOUT 0xFFFFFFFF
+#define ENA_REGS_ADMIN_INTR_MASK 1
+
/*****************************************************************************/
/*****************************************************************************/
/*****************************************************************************/
tail_masked = admin_queue->sq.tail & queue_size_mask;
/* In case of queue FULL */
- cnt = admin_queue->sq.tail - admin_queue->sq.head;
+ cnt = atomic_read(&admin_queue->outstanding_cmds);
if (cnt >= admin_queue->q_depth) {
- pr_debug("admin queue is FULL (tail %d head %d depth: %d)\n",
- admin_queue->sq.tail, admin_queue->sq.head,
- admin_queue->q_depth);
+ pr_debug("admin queue is full.\n");
admin_queue->stats.out_of_space++;
return ERR_PTR(-ENOSPC);
}
static int ena_com_wait_and_process_admin_cq_polling(struct ena_comp_ctx *comp_ctx,
struct ena_com_admin_queue *admin_queue)
{
- unsigned long flags;
- u32 start_time;
+ unsigned long flags, timeout;
int ret;
- start_time = ((u32)jiffies_to_usecs(jiffies));
+ timeout = jiffies + ADMIN_CMD_TIMEOUT_US;
+
+ while (1) {
+ spin_lock_irqsave(&admin_queue->q_lock, flags);
+ ena_com_handle_admin_completion(admin_queue);
+ spin_unlock_irqrestore(&admin_queue->q_lock, flags);
+
+ if (comp_ctx->status != ENA_CMD_SUBMITTED)
+ break;
- while (comp_ctx->status == ENA_CMD_SUBMITTED) {
- if ((((u32)jiffies_to_usecs(jiffies)) - start_time) >
- ADMIN_CMD_TIMEOUT_US) {
+ if (time_is_before_jiffies(timeout)) {
pr_err("Wait for completion (polling) timeout\n");
/* ENA didn't have any completion */
spin_lock_irqsave(&admin_queue->q_lock, flags);
goto err;
}
- spin_lock_irqsave(&admin_queue->q_lock, flags);
- ena_com_handle_admin_completion(admin_queue);
- spin_unlock_irqrestore(&admin_queue->q_lock, flags);
-
msleep(100);
}
void ena_com_set_admin_polling_mode(struct ena_com_dev *ena_dev, bool polling)
{
+ u32 mask_value = 0;
+
+ if (polling)
+ mask_value = ENA_REGS_ADMIN_INTR_MASK;
+
+ writel(mask_value, ena_dev->reg_bar + ENA_REGS_INTR_MASK_OFF);
ena_dev->admin_queue.polling = polling;
}
rxr->sgl_size = adapter->max_rx_sgl_size;
rxr->smoothed_interval =
ena_com_get_nonadaptive_moderation_interval_rx(ena_dev);
+ rxr->empty_rx_queue = 0;
}
}
rx_ring->per_napi_bytes = 0;
}
+static inline void ena_unmask_interrupt(struct ena_ring *tx_ring,
+ struct ena_ring *rx_ring)
+{
+ struct ena_eth_io_intr_reg intr_reg;
+
+ /* Update intr register: rx intr delay,
+ * tx intr delay and interrupt unmask
+ */
+ ena_com_update_intr_reg(&intr_reg,
+ rx_ring->smoothed_interval,
+ tx_ring->smoothed_interval,
+ true);
+
+ /* It is a shared MSI-X.
+ * Tx and Rx CQ have pointer to it.
+ * So we use one of them to reach the intr reg
+ */
+ ena_com_unmask_intr(rx_ring->ena_com_io_cq, &intr_reg);
+}
+
static inline void ena_update_ring_numa_node(struct ena_ring *tx_ring,
struct ena_ring *rx_ring)
{
{
struct ena_napi *ena_napi = container_of(napi, struct ena_napi, napi);
struct ena_ring *tx_ring, *rx_ring;
- struct ena_eth_io_intr_reg intr_reg;
u32 tx_work_done;
u32 rx_work_done;
if (ena_com_get_adaptive_moderation_enabled(rx_ring->ena_dev))
ena_adjust_intr_moderation(rx_ring, tx_ring);
- /* Update intr register: rx intr delay,
- * tx intr delay and interrupt unmask
- */
- ena_com_update_intr_reg(&intr_reg,
- rx_ring->smoothed_interval,
- tx_ring->smoothed_interval,
- true);
-
- /* It is a shared MSI-X.
- * Tx and Rx CQ have pointer to it.
- * So we use one of them to reach the intr reg
- */
- ena_com_unmask_intr(rx_ring->ena_com_io_cq, &intr_reg);
+ ena_unmask_interrupt(tx_ring, rx_ring);
}
-
ena_update_ring_numa_node(tx_ring, rx_ring);
ret = rx_work_done;
ena_napi_enable_all(adapter);
+ /* Enable completion queues interrupt */
+ for (i = 0; i < adapter->num_queues; i++)
+ ena_unmask_interrupt(&adapter->tx_ring[i],
+ &adapter->rx_ring[i]);
+
/* schedule napi in case we had pending packets
* from the last time we disable napi
*/
"Failed to get TX queue handlers. TX queue num %d rc: %d\n",
qid, rc);
ena_com_destroy_io_queue(ena_dev, ena_qid);
+ return rc;
}
ena_com_update_numa_node(tx_ring->ena_com_io_cq, ctx.numa_node);
"Failed to get RX queue handlers. RX queue num %d rc: %d\n",
qid, rc);
ena_com_destroy_io_queue(ena_dev, ena_qid);
+ return rc;
}
ena_com_update_numa_node(rx_ring->ena_com_io_cq, ctx.numa_node);
tx_info->tx_descs = nb_hw_desc;
tx_info->last_jiffies = jiffies;
+ tx_info->print_once = 0;
tx_ring->next_to_use = ENA_TX_RING_IDX_NEXT(next_to_use,
tx_ring->ring_size);
"Reset attempt failed. Can not reset the device\n");
}
-static void check_for_missing_tx_completions(struct ena_adapter *adapter)
+static int check_missing_comp_in_queue(struct ena_adapter *adapter,
+ struct ena_ring *tx_ring)
{
struct ena_tx_buffer *tx_buf;
unsigned long last_jiffies;
+ u32 missed_tx = 0;
+ int i;
+
+ for (i = 0; i < tx_ring->ring_size; i++) {
+ tx_buf = &tx_ring->tx_buffer_info[i];
+ last_jiffies = tx_buf->last_jiffies;
+ if (unlikely(last_jiffies &&
+ time_is_before_jiffies(last_jiffies + TX_TIMEOUT))) {
+ if (!tx_buf->print_once)
+ netif_notice(adapter, tx_err, adapter->netdev,
+ "Found a Tx that wasn't completed on time, qid %d, index %d.\n",
+ tx_ring->qid, i);
+
+ tx_buf->print_once = 1;
+ missed_tx++;
+
+ if (unlikely(missed_tx > MAX_NUM_OF_TIMEOUTED_PACKETS)) {
+ netif_err(adapter, tx_err, adapter->netdev,
+ "The number of lost tx completions is above the threshold (%d > %d). Reset the device\n",
+ missed_tx, MAX_NUM_OF_TIMEOUTED_PACKETS);
+ set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
+ return -EIO;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static void check_for_missing_tx_completions(struct ena_adapter *adapter)
+{
struct ena_ring *tx_ring;
- int i, j, budget;
- u32 missed_tx;
+ int i, budget, rc;
/* Make sure the driver doesn't turn the device in other process */
smp_rmb();
for (i = adapter->last_monitored_tx_qid; i < adapter->num_queues; i++) {
tx_ring = &adapter->tx_ring[i];
- for (j = 0; j < tx_ring->ring_size; j++) {
- tx_buf = &tx_ring->tx_buffer_info[j];
- last_jiffies = tx_buf->last_jiffies;
- if (unlikely(last_jiffies && time_is_before_jiffies(last_jiffies + TX_TIMEOUT))) {
- netif_notice(adapter, tx_err, adapter->netdev,
- "Found a Tx that wasn't completed on time, qid %d, index %d.\n",
- tx_ring->qid, j);
-
- u64_stats_update_begin(&tx_ring->syncp);
- missed_tx = tx_ring->tx_stats.missing_tx_comp++;
- u64_stats_update_end(&tx_ring->syncp);
-
- /* Clear last jiffies so the lost buffer won't
- * be counted twice.
- */
- tx_buf->last_jiffies = 0;
-
- if (unlikely(missed_tx > MAX_NUM_OF_TIMEOUTED_PACKETS)) {
- netif_err(adapter, tx_err, adapter->netdev,
- "The number of lost tx completion is above the threshold (%d > %d). Reset the device\n",
- missed_tx, MAX_NUM_OF_TIMEOUTED_PACKETS);
- set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
- }
- }
- }
+ rc = check_missing_comp_in_queue(adapter, tx_ring);
+ if (unlikely(rc))
+ return;
budget--;
if (!budget)
adapter->last_monitored_tx_qid = i % adapter->num_queues;
}
+/* trigger napi schedule after 2 consecutive detections */
+#define EMPTY_RX_REFILL 2
+/* For the rare case where the device runs out of Rx descriptors and the
+ * napi handler failed to refill new Rx descriptors (due to a lack of memory
+ * for example).
+ * This case will lead to a deadlock:
+ * The device won't send interrupts since all the new Rx packets will be dropped
+ * The napi handler won't allocate new Rx descriptors so the device will be
+ * able to send new packets.
+ *
+ * This scenario can happen when the kernel's vm.min_free_kbytes is too small.
+ * It is recommended to have at least 512MB, with a minimum of 128MB for
+ * constrained environment).
+ *
+ * When such a situation is detected - Reschedule napi
+ */
+static void check_for_empty_rx_ring(struct ena_adapter *adapter)
+{
+ struct ena_ring *rx_ring;
+ int i, refill_required;
+
+ if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
+ return;
+
+ if (test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))
+ return;
+
+ for (i = 0; i < adapter->num_queues; i++) {
+ rx_ring = &adapter->rx_ring[i];
+
+ refill_required =
+ ena_com_sq_empty_space(rx_ring->ena_com_io_sq);
+ if (unlikely(refill_required == (rx_ring->ring_size - 1))) {
+ rx_ring->empty_rx_queue++;
+
+ if (rx_ring->empty_rx_queue >= EMPTY_RX_REFILL) {
+ u64_stats_update_begin(&rx_ring->syncp);
+ rx_ring->rx_stats.empty_rx_ring++;
+ u64_stats_update_end(&rx_ring->syncp);
+
+ netif_err(adapter, drv, adapter->netdev,
+ "trigger refill for ring %d\n", i);
+
+ napi_schedule(rx_ring->napi);
+ rx_ring->empty_rx_queue = 0;
+ }
+ } else {
+ rx_ring->empty_rx_queue = 0;
+ }
+ }
+}
+
/* Check for keep alive expiration */
static void check_for_missing_keep_alive(struct ena_adapter *adapter)
{
check_for_missing_tx_completions(adapter);
+ check_for_empty_rx_ring(adapter);
+
if (debug_area)
ena_dump_stats_to_buf(adapter, debug_area);
{
int release_bars;
+ if (ena_dev->mem_bar)
+ devm_iounmap(&pdev->dev, ena_dev->mem_bar);
+
+ devm_iounmap(&pdev->dev, ena_dev->reg_bar);
+
release_bars = pci_select_bars(pdev, IORESOURCE_MEM) & ENA_BAR_MASK;
pci_release_selected_regions(pdev, release_bars);
}
goto err_free_ena_dev;
}
- ena_dev->reg_bar = ioremap(pci_resource_start(pdev, ENA_REG_BAR),
- pci_resource_len(pdev, ENA_REG_BAR));
+ ena_dev->reg_bar = devm_ioremap(&pdev->dev,
+ pci_resource_start(pdev, ENA_REG_BAR),
+ pci_resource_len(pdev, ENA_REG_BAR));
if (!ena_dev->reg_bar) {
dev_err(&pdev->dev, "failed to remap regs bar\n");
rc = -EFAULT;
ena_set_push_mode(pdev, ena_dev, &get_feat_ctx);
if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
- ena_dev->mem_bar = ioremap_wc(pci_resource_start(pdev, ENA_MEM_BAR),
- pci_resource_len(pdev, ENA_MEM_BAR));
+ ena_dev->mem_bar = devm_ioremap_wc(&pdev->dev,
+ pci_resource_start(pdev, ENA_MEM_BAR),
+ pci_resource_len(pdev, ENA_MEM_BAR));
if (!ena_dev->mem_bar) {
rc = -EFAULT;
goto err_device_destroy;
projects / karo-tx-linux.git / commitdiff