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net/af_xdp: fix zero-copy Tx queue drain

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Call xsk_ring_prod__submit() before kick_tx() so that the kernel
consumer sees the updated state of Tx ring. Otherwise, Tx packets are
stuck in the ring until the next call to af_xdp_tx_zc().

Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks")
Cc: stable@dpdk.org

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Acked-by: Ciara Loftus <ciara.loftus@intel.com>
This commit is contained in:
Baruch Siach 2021-08-25 13:05:44 +03:00 committed by Ferruh Yigit
parent a550baf24a
commit 0f2ffb49ce
1 changed files with 1 additions and 3 deletions
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4
drivers/net/af_xdp/rte_eth_af_xdp.c
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@ -527,7 +527,6 @@ af_xdp_tx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
if (!xsk_ring_prod__reserve(&txq->tx, 1, &idx_tx)) {
rte_pktmbuf_free(local_mbuf);
kick_tx(txq, cq);
goto out;
}
@ -551,10 +550,9 @@ af_xdp_tx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
tx_bytes += mbuf->pkt_len;
}
kick_tx(txq, cq);
out:
xsk_ring_prod__submit(&txq->tx, count);
kick_tx(txq, cq);
txq->stats.tx_pkts += count;
txq->stats.tx_bytes += tx_bytes;