[dpdk-dev] [PATCH] net/iavf: set CMD bit2 to 1 in Tx Desc of AVX Tx path

Leyi Rong leyi.rong at intel.com
Thu Nov 7 06:21:44 CET 2019


Fix iavf vf_checksum_sw case fail in X710/XXV710, set bit2 to 1
of CMD field in Tx descriptor of AVX Tx path according to Spec.

Fixes: af0c246a3800 ("net/iavf: enable AVX2 for iavf")

Signed-off-by: Leyi Rong <leyi.rong at intel.com>
---
 drivers/net/iavf/iavf_rxtx_vec_avx2.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/iavf/iavf_rxtx_vec_avx2.c b/drivers/net/iavf/iavf_rxtx_vec_avx2.c
index f0c00be56..2c7375576 100644
--- a/drivers/net/iavf/iavf_rxtx_vec_avx2.c
+++ b/drivers/net/iavf/iavf_rxtx_vec_avx2.c
@@ -785,8 +785,9 @@ iavf_xmit_fixed_burst_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
 	volatile struct iavf_tx_desc *txdp;
 	struct iavf_tx_entry *txep;
 	uint16_t n, nb_commit, tx_id;
-	uint64_t flags = IAVF_TX_DESC_CMD_EOP;
-	uint64_t rs = IAVF_TX_DESC_CMD_RS | IAVF_TX_DESC_CMD_EOP;
+	/* bit2 is reserved and must be set to 1 according to Spec */
+	uint64_t flags = IAVF_TX_DESC_CMD_EOP | 0x04;
+	uint64_t rs = IAVF_TX_DESC_CMD_RS | flags;
 
 	/* cross rx_thresh boundary is not allowed */
 	nb_pkts = RTE_MIN(nb_pkts, txq->rs_thresh);
-- 
2.17.1



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