From: Tariq Toukan Date: Thu, 31 May 2018 15:01:31 +0000 (+0300) Subject: net/mlx5e: IPOIB, Fix overflowing SQ WQE memset X-Git-Tag: 4.18-rc1-smb3-fixes~114^2~79^2~16 X-Git-Url: http://git.samba.org/samba.git/?a=commitdiff_plain;h=4b3e85a52ae4ea516fe297acad32872bc13bf620;p=sfrench%2Fcifs-2.6.git net/mlx5e: IPOIB, Fix overflowing SQ WQE memset 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: 043dc78ecf07 ("net/mlx5e: TX, Use actual WQE size for SQ edge fill") Signed-off-by: Tariq Toukan Signed-off-by: Saeed Mahameed --- diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c index aafd75257fd0..9829ee02de31 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c @@ -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;