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net/mlx5e: IPOIB, Fix overflowing SQ WQE memset

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IPoIB WQE size is larger than a single WQEBB.  Must not fetch the WQE,
and surely not memset it, until it is guaranteed that there are enough
WQEBBs available before getting to SQ/frag edge.

Fixes: 043dc78ecf ("net/mlx5e: TX, Use actual WQE size for SQ edge fill")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2018-05-31 18:01:31 +03:00 committed by Saeed Mahameed
parent 21ad117358
commit 4b3e85a52a
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
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@ -653,8 +653,6 @@ netdev_tx_t mlx5i_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
int num_dma;
__be16 mss;
mlx5i_sq_fetch_wqe(sq, &wqe, &pi);
/* Calc ihs and ds cnt, no writes to wqe yet */
ds_cnt = sizeof(*wqe) / MLX5_SEND_WQE_DS;
if (skb_is_gso(skb)) {
@ -686,10 +684,12 @@ netdev_tx_t mlx5i_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS);
frag_pi = mlx5_wq_cyc_ctr2fragix(wq, sq->pc);
if (unlikely(frag_pi + num_wqebbs > mlx5_wq_cyc_get_frag_size(wq))) {
pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
mlx5e_fill_sq_frag_edge(sq, wq, pi, frag_pi);
mlx5i_sq_fetch_wqe(sq, &wqe, &pi);
}
mlx5i_sq_fetch_wqe(sq, &wqe, &pi);
/* fill wqe */
wi = &sq->db.wqe_info[pi];
cseg = &wqe->ctrl;