[PATCH v5 14/28] net/cnxk: fix roundup size with transport mode

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

For transport mode, roundup needs to be based on L4 data
and shouldn't include L3 length.
By including l3 length, rlen that is calculated and put in
send hdr would cross the final length of the packet in some
scenarios where padding is necessary.
Also when outer and inner checksum offload flags are enabled,
get the l2_len and l3_len from il3ptr and il4ptr.

Fixes: 55bfac717c72 ("net/cnxk: support Tx security offload on cn10k")
Cc: stable@dpdk.org

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
 drivers/net/cnxk/cn10k_tx.h | 34 ++++++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/net/cnxk/cn10k_tx.h b/drivers/net/cnxk/cn10k_tx.h
index feaa41f..ae0573f 100644
--- a/drivers/net/cnxk/cn10k_tx.h
+++ b/drivers/net/cnxk/cn10k_tx.h
@@ -248,23 +248,29 @@ cn10k_nix_prep_sec_vec(struct rte_mbuf *m, uint64x2_t *cmd0, uint64x2_t *cmd1,
 	uint32_t pkt_len, dlen_adj, rlen;
 	uint8_t l3l4type, chksum;
 	uint64x2_t cmd01, cmd23;
+	uint8_t l2_len, l3_len;
 	uintptr_t dptr, nixtx;
 	uint64_t ucode_cmd[4];
 	uint64_t *laddr;
-	uint8_t l2_len;
 	uint16_t tag;
 	uint64_t sa;
 
 	sess_priv.u64 = *rte_security_dynfield(m);
 
 	if (flags & NIX_TX_NEED_SEND_HDR_W1) {
-		l2_len = vgetq_lane_u8(*cmd0, 8);
 		/* Extract l3l4type either from il3il4type or ol3ol4type */
 		if (flags & NIX_TX_OFFLOAD_L3_L4_CSUM_F &&
-		    flags & NIX_TX_OFFLOAD_OL3_OL4_CSUM_F)
+		    flags & NIX_TX_OFFLOAD_OL3_OL4_CSUM_F) {
+			l2_len = vgetq_lane_u8(*cmd0, 10);
+			/* L4 ptr from send hdr includes l2 and l3 len */
+			l3_len = vgetq_lane_u8(*cmd0, 11) - l2_len;
 			l3l4type = vgetq_lane_u8(*cmd0, 13);
-		else
+		} else {
+			l2_len = vgetq_lane_u8(*cmd0, 8);
+			/* L4 ptr from send hdr includes l2 and l3 len */
+			l3_len = vgetq_lane_u8(*cmd0, 9) - l2_len;
 			l3l4type = vgetq_lane_u8(*cmd0, 12);
+		}
 
 		chksum = (l3l4type & 0x1) << 1 | !!(l3l4type & 0x30);
 		chksum = ~chksum;
@@ -273,6 +279,7 @@ cn10k_nix_prep_sec_vec(struct rte_mbuf *m, uint64x2_t *cmd0, uint64x2_t *cmd1,
 		*cmd0 = vsetq_lane_u16(0, *cmd0, 6);
 	} else {
 		l2_len = m->l2_len;
+		l3_len = m->l3_len;
 	}
 
 	/* Retrieve DPTR */
@@ -281,6 +288,8 @@ cn10k_nix_prep_sec_vec(struct rte_mbuf *m, uint64x2_t *cmd0, uint64x2_t *cmd1,
 
 	/* Calculate dlen adj */
 	dlen_adj = pkt_len - l2_len;
+	/* Exclude l3 len from roundup for transport mode */
+	dlen_adj -= sess_priv.mode ? 0 : l3_len;
 	rlen = (dlen_adj + sess_priv.roundup_len) +
 	       (sess_priv.roundup_byte - 1);
 	rlen &= ~(uint64_t)(sess_priv.roundup_byte - 1);
@@ -360,10 +369,10 @@ cn10k_nix_prep_sec(struct rte_mbuf *m, uint64_t *cmd, uintptr_t *nixtx_addr,
 	uint8_t l3l4type, chksum;
 	uint64x2_t cmd01, cmd23;
 	union nix_send_sg_s *sg;
+	uint8_t l2_len, l3_len;
 	uintptr_t dptr, nixtx;
 	uint64_t ucode_cmd[4];
 	uint64_t *laddr;
-	uint8_t l2_len;
 	uint16_t tag;
 	uint64_t sa;
 
@@ -376,13 +385,19 @@ cn10k_nix_prep_sec(struct rte_mbuf *m, uint64_t *cmd, uintptr_t *nixtx_addr,
 		sg = (union nix_send_sg_s *)&cmd[2];
 
 	if (flags & NIX_TX_NEED_SEND_HDR_W1) {
-		l2_len = cmd[1] & 0xFF;
 		/* Extract l3l4type either from il3il4type or ol3ol4type */
 		if (flags & NIX_TX_OFFLOAD_L3_L4_CSUM_F &&
-		    flags & NIX_TX_OFFLOAD_OL3_OL4_CSUM_F)
+		    flags & NIX_TX_OFFLOAD_OL3_OL4_CSUM_F) {
+			l2_len = (cmd[1] >> 16) & 0xFF;
+			/* L4 ptr from send hdr includes l2 and l3 len */
+			l3_len = ((cmd[1] >> 24) & 0xFF) - l2_len;
 			l3l4type = (cmd[1] >> 40) & 0xFF;
-		else
+		} else {
+			l2_len = cmd[1] & 0xFF;
+			/* L4 ptr from send hdr includes l2 and l3 len */
+			l3_len = ((cmd[1] >> 8) & 0xFF) - l2_len;
 			l3l4type = (cmd[1] >> 32) & 0xFF;
+		}
 
 		chksum = (l3l4type & 0x1) << 1 | !!(l3l4type & 0x30);
 		chksum = ~chksum;
@@ -391,6 +406,7 @@ cn10k_nix_prep_sec(struct rte_mbuf *m, uint64_t *cmd, uintptr_t *nixtx_addr,
 		cmd[1] &= ~(0xFFFFUL << 32);
 	} else {
 		l2_len = m->l2_len;
+		l3_len = m->l3_len;
 	}
 
 	/* Retrieve DPTR */
@@ -399,6 +415,8 @@ cn10k_nix_prep_sec(struct rte_mbuf *m, uint64_t *cmd, uintptr_t *nixtx_addr,
 
 	/* Calculate dlen adj */
 	dlen_adj = pkt_len - l2_len;
+	/* Exclude l3 len from roundup for transport mode */
+	dlen_adj -= sess_priv.mode ? 0 : l3_len;
 	rlen = (dlen_adj + sess_priv.roundup_len) +
 	       (sess_priv.roundup_byte - 1);
 	rlen &= ~(uint64_t)(sess_priv.roundup_byte - 1);
-- 
2.8.4