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path: root/drivers/net/ethernet/sfc/tx.c
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Diffstat (limited to 'drivers/net/ethernet/sfc/tx.c')
-rw-r--r--drivers/net/ethernet/sfc/tx.c43
1 files changed, 19 insertions, 24 deletions
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 320609842211..ee84a90e371c 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -132,15 +132,6 @@ unsigned int efx_tx_max_skb_descs(struct efx_nic *efx)
return max_descs;
}
-/* Get partner of a TX queue, seen as part of the same net core queue */
-static struct efx_tx_queue *efx_tx_queue_partner(struct efx_tx_queue *tx_queue)
-{
- if (tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD)
- return tx_queue - EFX_TXQ_TYPE_OFFLOAD;
- else
- return tx_queue + EFX_TXQ_TYPE_OFFLOAD;
-}
-
static void efx_tx_maybe_stop_queue(struct efx_tx_queue *txq1)
{
/* We need to consider both queues that the net core sees as one */
@@ -344,6 +335,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
struct efx_nic *efx = tx_queue->efx;
struct device *dma_dev = &efx->pci_dev->dev;
struct efx_tx_buffer *buffer;
+ unsigned int old_insert_count = tx_queue->insert_count;
skb_frag_t *fragment;
unsigned int len, unmap_len = 0;
dma_addr_t dma_addr, unmap_addr = 0;
@@ -351,7 +343,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
unsigned short dma_flags;
int i = 0;
- EFX_BUG_ON_PARANOID(tx_queue->write_count != tx_queue->insert_count);
+ EFX_BUG_ON_PARANOID(tx_queue->write_count > tx_queue->insert_count);
if (skb_shinfo(skb)->gso_size)
return efx_enqueue_skb_tso(tx_queue, skb);
@@ -369,9 +361,8 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
/* Consider using PIO for short packets */
#ifdef EFX_USE_PIO
- if (skb->len <= efx_piobuf_size && tx_queue->piobuf &&
- efx_nic_tx_is_empty(tx_queue) &&
- efx_nic_tx_is_empty(efx_tx_queue_partner(tx_queue))) {
+ if (skb->len <= efx_piobuf_size && !skb->xmit_more &&
+ efx_nic_may_tx_pio(tx_queue)) {
buffer = efx_enqueue_skb_pio(tx_queue, skb);
dma_flags = EFX_TX_BUF_OPTION;
goto finish_packet;
@@ -439,13 +430,14 @@ finish_packet:
netdev_tx_sent_queue(tx_queue->core_txq, skb->len);
+ efx_tx_maybe_stop_queue(tx_queue);
+
/* Pass off to hardware */
- efx_nic_push_buffers(tx_queue);
+ if (!skb->xmit_more || netif_xmit_stopped(tx_queue->core_txq))
+ efx_nic_push_buffers(tx_queue);
tx_queue->tx_packets++;
- efx_tx_maybe_stop_queue(tx_queue);
-
return NETDEV_TX_OK;
dma_err:
@@ -458,7 +450,7 @@ finish_packet:
dev_kfree_skb_any(skb);
/* Work backwards until we hit the original insert pointer value */
- while (tx_queue->insert_count != tx_queue->write_count) {
+ while (tx_queue->insert_count != old_insert_count) {
unsigned int pkts_compl = 0, bytes_compl = 0;
--tx_queue->insert_count;
buffer = __efx_tx_queue_get_insert_buffer(tx_queue);
@@ -989,12 +981,13 @@ static int efx_tso_put_header(struct efx_tx_queue *tx_queue,
/* Remove buffers put into a tx_queue. None of the buffers must have
* an skb attached.
*/
-static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
+static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue,
+ unsigned int insert_count)
{
struct efx_tx_buffer *buffer;
/* Work backwards until we hit the original insert pointer value */
- while (tx_queue->insert_count != tx_queue->write_count) {
+ while (tx_queue->insert_count != insert_count) {
--tx_queue->insert_count;
buffer = __efx_tx_queue_get_insert_buffer(tx_queue);
efx_dequeue_buffer(tx_queue, buffer, NULL, NULL);
@@ -1258,13 +1251,14 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
struct sk_buff *skb)
{
struct efx_nic *efx = tx_queue->efx;
+ unsigned int old_insert_count = tx_queue->insert_count;
int frag_i, rc;
struct tso_state state;
/* Find the packet protocol and sanity-check it */
state.protocol = efx_tso_check_protocol(skb);
- EFX_BUG_ON_PARANOID(tx_queue->write_count != tx_queue->insert_count);
+ EFX_BUG_ON_PARANOID(tx_queue->write_count > tx_queue->insert_count);
rc = tso_start(&state, efx, skb);
if (rc)
@@ -1308,11 +1302,12 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
netdev_tx_sent_queue(tx_queue->core_txq, skb->len);
- /* Pass off to hardware */
- efx_nic_push_buffers(tx_queue);
-
efx_tx_maybe_stop_queue(tx_queue);
+ /* Pass off to hardware */
+ if (!skb->xmit_more || netif_xmit_stopped(tx_queue->core_txq))
+ efx_nic_push_buffers(tx_queue);
+
tx_queue->tso_bursts++;
return NETDEV_TX_OK;
@@ -1336,6 +1331,6 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
dma_unmap_single(&efx->pci_dev->dev, state.header_dma_addr,
state.header_unmap_len, DMA_TO_DEVICE);
- efx_enqueue_unwind(tx_queue);
+ efx_enqueue_unwind(tx_queue, old_insert_count);
return NETDEV_TX_OK;
}