[dpdk-stable] patch 'net/mlx5: fix calculating TSO inline size' has been queued to stable release 17.08.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.08.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 15c22ea1360c895f949029c89d56ad0f73a6540d Mon Sep 17 00:00:00 2001
From: Yongseok Koh <yskoh at mellanox.com>
Date: Thu, 31 Aug 2017 09:27:06 -0700
Subject: [PATCH] net/mlx5: fix calculating TSO inline size

[ upstream commit d829249790f08fd54ccc0d5e462b2a6512c9eae1 ]

Tx descriptor for TSO embeds packet header to be replicated. If Tx
inline is enabled, there could be additional packet data inlined with
4B inline header ahead. And between the header and additional inlined
packet data, there may be padding to make the inline part aligned to
MLX5_WQE_DWORD_SIZE. In calculating the total size of inlined data,
the size of inline header and padding is missing.

Fixes: 3f13f8c23a7c ("net/mlx5: support hardware TSO")

Signed-off-by: Shahaf Shuler <shahafs at mellanox.com>
Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
---
 drivers/net/mlx5/mlx5_rxtx.c | 25 +++++++++----------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index b07bcd1..d3d61c8 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -461,6 +461,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 			length -= pkt_inline_sz;
 			addr += pkt_inline_sz;
 		}
+		raw += MLX5_WQE_DWORD_SIZE;
 		if (txq->tso_en) {
 			tso = buf->ol_flags & PKT_TX_TCP_SEG;
 			if (tso) {
@@ -493,7 +494,6 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 				copy_b = tso_header_sz - pkt_inline_sz;
 				/* First seg must contain all headers. */
 				assert(copy_b <= length);
-				raw += MLX5_WQE_DWORD_SIZE;
 				if (copy_b &&
 				   ((end - (uintptr_t)raw) > copy_b)) {
 					uint16_t n = (MLX5_WQE_DS(copy_b) -
@@ -506,14 +506,11 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 						   (void *)addr, copy_b);
 					addr += copy_b;
 					length -= copy_b;
+					/* Include padding for TSO header. */
+					copy_b = MLX5_WQE_DS(copy_b) *
+						 MLX5_WQE_DWORD_SIZE;
 					pkt_inline_sz += copy_b;
-					/*
-					 * Another DWORD will be added
-					 * in the inline part.
-					 */
-					raw += MLX5_WQE_DS(copy_b) *
-					       MLX5_WQE_DWORD_SIZE -
-					       MLX5_WQE_DWORD_SIZE;
+					raw += copy_b;
 				} else {
 					/* NOP WQE. */
 					wqe->ctrl = (rte_v128u32_t){
@@ -531,19 +528,20 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 		}
 		/* Inline if enough room. */
 		if (inline_en || tso) {
+			uint32_t inl;
 			uintptr_t end = (uintptr_t)
 				(((uintptr_t)txq->wqes) +
 				 (1 << txq->wqe_n) * MLX5_WQE_SIZE);
 			unsigned int inline_room = max_inline *
 						   RTE_CACHE_LINE_SIZE -
-						   (pkt_inline_sz - 2);
+						   (pkt_inline_sz - 2) -
+						   !!tso * sizeof(inl);
 			uintptr_t addr_end = (addr + inline_room) &
 					     ~(RTE_CACHE_LINE_SIZE - 1);
 			unsigned int copy_b = (addr_end > addr) ?
 				RTE_MIN((addr_end - addr), length) :
 				0;
 
-			raw += MLX5_WQE_DWORD_SIZE;
 			if (copy_b && ((end - (uintptr_t)raw) > copy_b)) {
 				/*
 				 * One Dseg remains in the current WQE.  To
@@ -556,12 +554,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 					break;
 				max_wqe -= n;
 				if (tso) {
-					uint32_t inl =
-						htonl(copy_b | MLX5_INLINE_SEG);
-
-					pkt_inline_sz =
-						MLX5_WQE_DS(tso_header_sz) *
-						MLX5_WQE_DWORD_SIZE;
+					inl = htonl(copy_b | MLX5_INLINE_SEG);
 					rte_memcpy((void *)raw,
 						   (void *)&inl, sizeof(inl));
 					raw += sizeof(inl);
-- 
2.7.4