* [dpdk-stable] [PATCH 20.11] net/iavf: fix wrong Tx context descriptor
@ 2021-05-01 1:54 Qi Zhang
0 siblings, 0 replies; only message in thread
From: Qi Zhang @ 2021-05-01 1:54 UTC (permalink / raw)
To: beilei.xing; +Cc: stable, bluca, timothy.miskell, arjun.anantharam, Qi Zhang
The QW0 of Tx context descriptor should be reset to 0, otherwise the
previous hardware writeback value may polute the next context descriptor
write.
Fixes: a2b29a7733ef ("net/avf: enable basic Rx Tx")
Cc: stable@dpdk.org
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
---
drivers/net/iavf/iavf_rxtx.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index 21d508b3f4..702efc695f 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -2173,6 +2173,11 @@ 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) {
--
2.26.2
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