[PATCH] net/cnxk: fix of NIX send header L3 type

[Rahul Bhansali]

For small packets less than 55 bytes, SQ error interrupts are
observed.
When checksum offload flag is enabled and mbuf ol_flags are not
set, then default L3 type will be set to IPv6 in vector
processing. Based on this, HW will still validate for minimum
header size and generate send header error if mismatch.

To address this, will set default L3 type to none. Mbuf ol_flags
RTE_MBUF_F_TX_IPV6 will set with offload feature TSO or L4
checksum only, so handled in corresponding routine.

Fixes: f71b7dbbf04b ("net/cnxk: add vector Tx for CN10K")
Fixes: e829e60c6917 ("net/cnxk: support Tx burst vector for CN20K")

Signed-off-by: Rahul Bhansali <rbhansali at marvell.com>
---
 drivers/net/cnxk/cn10k_tx.h | 7 +++++--
 drivers/net/cnxk/cn20k_tx.h | 7 +++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/net/cnxk/cn10k_tx.h b/drivers/net/cnxk/cn10k_tx.h
index 7d9b259a5f..77f4e54cd8 100644
--- a/drivers/net/cnxk/cn10k_tx.h
+++ b/drivers/net/cnxk/cn10k_tx.h
@@ -1773,6 +1773,9 @@ cn10k_nix_prepare_tso(struct rte_mbuf *m, union nix_send_hdr_w1_u *w1,
 	w0->lso_mps = m->tso_segsz;
 	w0->lso_format = NIX_LSO_FORMAT_IDX_TSOV4 + !!(ol_flags & RTE_MBUF_F_TX_IPV6);
 	w1->ol4type = NIX_SENDL4TYPE_TCP_CKSUM;
+	w1->ol3type = ((!!(ol_flags & RTE_MBUF_F_TX_IPV4)) << 1) +
+		      ((!!(ol_flags & RTE_MBUF_F_TX_IPV6)) << 2) +
+		      !!(ol_flags & RTE_MBUF_F_TX_IP_CKSUM);
 
 	/* Handle tunnel tso */
 	if ((flags & NIX_TX_OFFLOAD_OL3_OL4_CSUM_F) &&
@@ -2477,7 +2480,7 @@ cn10k_nix_xmit_pkts_vector(void *tx_queue, uint64_t *ws,
 			 */
 			const uint8x16_t tbl = {
 				/* [0-15] = il4type:il3type */
-				0x04, /* none (IPv6 assumed) */
+				0x00, /* none */
 				0x14, /* RTE_MBUF_F_TX_TCP_CKSUM (IPv6 assumed) */
 				0x24, /* RTE_MBUF_F_TX_SCTP_CKSUM (IPv6 assumed) */
 				0x34, /* RTE_MBUF_F_TX_UDP_CKSUM (IPv6 assumed) */
@@ -2681,7 +2684,7 @@ cn10k_nix_xmit_pkts_vector(void *tx_queue, uint64_t *ws,
 			const uint8x16x2_t tbl = {{
 				{
 					/* [0-15] = il4type:il3type */
-					0x04, /* none (IPv6) */
+					0x00, /* none */
 					0x14, /* RTE_MBUF_F_TX_TCP_CKSUM (IPv6) */
 					0x24, /* RTE_MBUF_F_TX_SCTP_CKSUM (IPv6) */
 					0x34, /* RTE_MBUF_F_TX_UDP_CKSUM (IPv6) */
diff --git a/drivers/net/cnxk/cn20k_tx.h b/drivers/net/cnxk/cn20k_tx.h
index c731406529..dd28be1edd 100644
--- a/drivers/net/cnxk/cn20k_tx.h
+++ b/drivers/net/cnxk/cn20k_tx.h
@@ -1733,6 +1733,9 @@ cn20k_nix_prepare_tso(struct rte_mbuf *m, union nix_send_hdr_w1_u *w1, union nix
 	w0->lso_mps = m->tso_segsz;
 	w0->lso_format = NIX_LSO_FORMAT_IDX_TSOV4 + !!(ol_flags & RTE_MBUF_F_TX_IPV6);
 	w1->ol4type = NIX_SENDL4TYPE_TCP_CKSUM;
+	w1->ol3type = ((!!(ol_flags & RTE_MBUF_F_TX_IPV4)) << 1) +
+		      ((!!(ol_flags & RTE_MBUF_F_TX_IPV6)) << 2) +
+		      !!(ol_flags & RTE_MBUF_F_TX_IP_CKSUM);
 
 	/* Handle tunnel tso */
 	if ((flags & NIX_TX_OFFLOAD_OL3_OL4_CSUM_F) && (ol_flags & RTE_MBUF_F_TX_TUNNEL_MASK)) {
@@ -2395,7 +2398,7 @@ cn20k_nix_xmit_pkts_vector(void *tx_queue, uint64_t *ws, struct rte_mbuf **tx_pk
 			 */
 			const uint8x16_t tbl = {
 				/* [0-15] = il4type:il3type */
-				0x04, /* none (IPv6 assumed) */
+				0x04, /* none */
 				0x14, /* RTE_MBUF_F_TX_TCP_CKSUM (IPv6 assumed) */
 				0x24, /* RTE_MBUF_F_TX_SCTP_CKSUM (IPv6 assumed) */
 				0x34, /* RTE_MBUF_F_TX_UDP_CKSUM (IPv6 assumed) */
@@ -2595,7 +2598,7 @@ cn20k_nix_xmit_pkts_vector(void *tx_queue, uint64_t *ws, struct rte_mbuf **tx_pk
 			const uint8x16x2_t tbl = {{
 				{
 					/* [0-15] = il4type:il3type */
-					0x04, /* none (IPv6) */
+					0x04, /* none */
 					0x14, /* RTE_MBUF_F_TX_TCP_CKSUM (IPv6) */
 					0x24, /* RTE_MBUF_F_TX_SCTP_CKSUM (IPv6) */
 					0x34, /* RTE_MBUF_F_TX_UDP_CKSUM (IPv6) */
-- 
2.25.1