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authorTariq Toukan <tariqt@mellanox.com>2017-02-22 17:20:16 +0200
committerDavid S. Miller <davem@davemloft.net>2017-02-23 10:43:10 -0500
commit36154be40a28e4afaa0416da2681d80b7e2ca319 (patch)
treed9bf7529f24cc817b4f514e081d77162bb284f62 /drivers/net/ethernet
parent6dc4b54e77282caf17f0ff72aa32dd296037fbc0 (diff)
downloadlinux-36154be40a28e4afaa0416da2681d80b7e2ca319.tar.gz
linux-36154be40a28e4afaa0416da2681d80b7e2ca319.tar.xz
net/mlx5e: Fix wrong CQE decompression
In cqe compression with striding RQ, the decompression of the CQE field wqe_counter was done with a wrong wraparound value. This caused handling cqes with a wrong pointer to wqe (rx descriptor) and creating SKBs with wrong data, pointing to wrong (and already consumed) strides/pages. The meaning of the CQE field wqe_counter in striding RQ holds the stride index instead of the WQE index. Hence, when decompressing a CQE, wqe_counter should have wrapped-around the number of strides in a single multi-packet WQE. We dropped this wrap-around mask at all in CQE decompression of striding RQ. It is not needed as in such cases the CQE compression session would break because of different value of wqe_id field, starting a new compression session. Tested: ethtool -K ethxx lro off/on ethtool --set-priv-flags ethxx rx_cqe_compress on super_netperf 16 {ipv4,ipv6} -t TCP_STREAM -m 50 -D verified no csum errors and no page refcount issues. Fixes: 7219ab34f184 ("net/mlx5e: CQE compression") Signed-off-by: Tariq Toukan <tariqt@mellanox.com> Reported-by: Tom Herbert <tom@herbertland.com> Cc: kernel-team@fb.com Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
-rw-r--r--drivers/net/ethernet/mellanox/mlx5/core/en_rx.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index d5ce20db3f0b..3d371688fbbb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -94,19 +94,18 @@ static inline void mlx5e_cqes_update_owner(struct mlx5e_cq *cq, u32 cqcc, int n)
static inline void mlx5e_decompress_cqe(struct mlx5e_rq *rq,
struct mlx5e_cq *cq, u32 cqcc)
{
- u16 wqe_cnt_step;
-
cq->title.byte_cnt = cq->mini_arr[cq->mini_arr_idx].byte_cnt;
cq->title.check_sum = cq->mini_arr[cq->mini_arr_idx].checksum;
cq->title.op_own &= 0xf0;
cq->title.op_own |= 0x01 & (cqcc >> cq->wq.log_sz);
cq->title.wqe_counter = cpu_to_be16(cq->decmprs_wqe_counter);
- wqe_cnt_step =
- rq->wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ ?
- mpwrq_get_cqe_consumed_strides(&cq->title) : 1;
- cq->decmprs_wqe_counter =
- (cq->decmprs_wqe_counter + wqe_cnt_step) & rq->wq.sz_m1;
+ if (rq->wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ)
+ cq->decmprs_wqe_counter +=
+ mpwrq_get_cqe_consumed_strides(&cq->title);
+ else
+ cq->decmprs_wqe_counter =
+ (cq->decmprs_wqe_counter + 1) & rq->wq.sz_m1;
}
static inline void mlx5e_decompress_cqe_no_hash(struct mlx5e_rq *rq,