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net/iavf: fix Tx context descriptor

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The QW0 of Tx context descriptor should be reset to 0, otherwise the
previous hardware writeback value may pollute the next context descriptor
write.

Fixes: a2b29a7733 ("net/avf: enable basic Rx Tx")
Cc: stable@dpdk.org

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Signed-off-by: Beilei Xing <beilei.xing@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
This commit is contained in:
Beilei Xing 2021-05-12 16:10:14 +08:00 committed by Qi Zhang
parent 752ab161bd
commit 2444d35dc1
1 changed files with 5 additions and 0 deletions
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5
drivers/net/iavf/iavf_rxtx.c
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@ -2245,6 +2245,11 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
(volatile struct iavf_tx_context_desc *)
&txr[tx_id];
/* clear QW0 or the previous writeback value
* may impact next write
*/
*(volatile uint64_t *)ctx_txd = 0;
txn = &sw_ring[txe->next_id];
RTE_MBUF_PREFETCH_TO_FREE(txn->mbuf);
if (txe->mbuf) {