[PATCH 7/7] net/gve: clear DQO Tx descriptors before writing

[Joshua Washington]

When TSO was introduced, it became possible for two differing descriptor
formats to be written to the descriptor ring, GVE_TX_PKT_DESC_DTYPE_DQO
and GVE_TX_TSO_CTX_DESC_DTYPE_DQO. Because these descriptor types have
different formats, they end up setting different fields, which can be
misinterpreted by the hardware if not fully cleared.

Fixes: 403c671a46b6 ("net/gve: support TSO in DQO RDA")
Cc: tathagat.dpdk at gmail.com
Cc: stable at dpdk.org

Signed-off-by: Joshua Washington <joshwash at google.com>
Reviewed-by: Ankit Garg <nktgrg at google.com>
---
 drivers/net/gve/gve_tx_dqo.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index 3befbbcacb..169c40d5b0 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -159,6 +159,8 @@ static inline void
 gve_tx_fill_seg_desc_dqo(volatile union gve_tx_desc_dqo *desc, struct rte_mbuf *tx_pkt)
 {
 	uint32_t hlen = tx_pkt->l2_len + tx_pkt->l3_len + tx_pkt->l4_len;
+
+	desc->tso_ctx = (struct gve_tx_tso_context_desc_dqo) {};
 	desc->tso_ctx.cmd_dtype.dtype = GVE_TX_TSO_CTX_DESC_DTYPE_DQO;
 	desc->tso_ctx.cmd_dtype.tso = 1;
 	desc->tso_ctx.mss = (uint16_t)tx_pkt->tso_segsz;
@@ -257,6 +259,7 @@ gve_tx_burst_dqo(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 					mbuf_offset;
 
 				txd = &txr[tx_id];
+				txd->pkt = (struct gve_tx_pkt_desc_dqo) {};
 				txd->pkt.buf_addr = rte_cpu_to_le_64(buf_addr);
 				txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
 				txd->pkt.dtype = GVE_TX_PKT_DESC_DTYPE_DQO;
-- 
2.50.0.727.gbf7dc18ff4-goog