[dpdk-dev] [PATCH] net/af_xdp: fix Tx halt when no recv packets

[Xiaolong Ye]

The kernel only consumes Tx packets if we have some Rx traffic on specified
queue or we have called send(). So we need to issue a send() even when the
allocation fails so that kernel will start to consume packets again.

Commit 45bba02c95b0 ("net/af_xdp: support need wakeup feature") breaks
above rule by adding some condition to send, this patch fixes it while
still keeps the need_wakeup feature for Tx.

Fixes: 45bba02c95b0 ("net/af_xdp: support need wakeup feature")
Cc: sta...@dpdk.org

Signed-off-by: Xiaolong Ye <xiaolong...@intel.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c 
b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 41ed5b2af..e496e9aaa 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -286,19 +286,16 @@ kick_tx(struct pkt_tx_queue *txq)
 {
        struct xsk_umem_info *umem = txq->pair->umem;
 
-#if defined(XDP_USE_NEED_WAKEUP)
-       if (xsk_ring_prod__needs_wakeup(&txq->tx))
-#endif
-               while (send(xsk_socket__fd(txq->pair->xsk), NULL,
-                           0, MSG_DONTWAIT) < 0) {
-                       /* some thing unexpected */
-                       if (errno != EBUSY && errno != EAGAIN && errno != EINTR)
-                               break;
-
-                       /* pull from completion queue to leave more space */
-                       if (errno == EAGAIN)
-                               pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
-               }
+       while (send(xsk_socket__fd(txq->pair->xsk), NULL,
+                   0, MSG_DONTWAIT) < 0) {
+               /* some thing unexpected */
+               if (errno != EBUSY && errno != EAGAIN && errno != EINTR)
+                       break;
+
+               /* pull from completion queue to leave more space */
+               if (errno == EAGAIN)
+                       pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
+       }
        pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
 }
 
@@ -367,7 +364,10 @@ eth_af_xdp_tx(void *queue, struct rte_mbuf **bufs, 
uint16_t nb_pkts)
 
        xsk_ring_prod__submit(&txq->tx, nb_pkts);
 
-       kick_tx(txq);
+#if defined(XDP_USE_NEED_WAKEUP)
+       if (xsk_ring_prod__needs_wakeup(&txq->tx))
+#endif
+               kick_tx(txq);
 
        txq->stats.tx_pkts += nb_pkts;
        txq->stats.tx_bytes += tx_bytes;
-- 
2.17.1