net/mlx5e: TX, Use correct counter in dma_map error flow

[ Upstream commit d9a96ec362e3da878c378854e25321c85bac52c2 ]

In case of a dma_mapping_error, do not use wi->num_dma
as a parameter for dma unmap function because it's yet
to be set, and holds an out-of-date value.
Use actual value (local variable num_dma) instead.

Fixes: 34802a42b352 ("net/mlx5e: Do not modify the TX SKB")
Fixes: e586b3b0baee ("net/mlx5: Ethernet Datapath files")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index eea7f931cad373f90b2402ade9ce7678d7402920..d560047c0bf9eacbeb48200dfe7574e2d44cb12d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -234,7 +234,7 @@ mlx5e_txwqe_build_dsegs(struct mlx5e_txqsq *sq, struct sk_buff *skb,
                dma_addr = dma_map_single(sq->pdev, skb_data, headlen,
                                          DMA_TO_DEVICE);
                if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
-                       return -ENOMEM;
+                       goto dma_unmap_wqe_err;
 
                dseg->addr       = cpu_to_be64(dma_addr);
                dseg->lkey       = sq->mkey_be;
@@ -252,7 +252,7 @@ mlx5e_txwqe_build_dsegs(struct mlx5e_txqsq *sq, struct sk_buff *skb,
                dma_addr = skb_frag_dma_map(sq->pdev, frag, 0, fsz,
                                            DMA_TO_DEVICE);
                if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
-                       return -ENOMEM;
+                       goto dma_unmap_wqe_err;
 
                dseg->addr       = cpu_to_be64(dma_addr);
                dseg->lkey       = sq->mkey_be;
@@ -264,6 +264,10 @@ mlx5e_txwqe_build_dsegs(struct mlx5e_txqsq *sq, struct sk_buff *skb,
        }
 
        return num_dma;
+
+dma_unmap_wqe_err:
+       mlx5e_dma_unmap_wqe_err(sq, num_dma);
+       return -ENOMEM;
 }
 
 static inline void
@@ -355,17 +359,15 @@ static netdev_tx_t mlx5e_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
        num_dma = mlx5e_txwqe_build_dsegs(sq, skb, skb_data, headlen,
                                          (struct mlx5_wqe_data_seg *)cseg + ds_cnt);
        if (unlikely(num_dma < 0))
-               goto dma_unmap_wqe_err;
+               goto err_drop;
 
        mlx5e_txwqe_complete(sq, skb, opcode, ds_cnt + num_dma,
                             num_bytes, num_dma, wi, cseg);
 
        return NETDEV_TX_OK;
 
-dma_unmap_wqe_err:
+err_drop:
        sq->stats.dropped++;
-       mlx5e_dma_unmap_wqe_err(sq, wi->num_dma);
-
        dev_kfree_skb_any(skb);
 
        return NETDEV_TX_OK;
@@ -594,17 +596,15 @@ netdev_tx_t mlx5i_sq_xmit(struct mlx5e_txqsq *sq, struct sk_buff *skb,
        num_dma = mlx5e_txwqe_build_dsegs(sq, skb, skb_data, headlen,
                                          (struct mlx5_wqe_data_seg *)cseg + ds_cnt);
        if (unlikely(num_dma < 0))
-               goto dma_unmap_wqe_err;
+               goto err_drop;
 
        mlx5e_txwqe_complete(sq, skb, opcode, ds_cnt + num_dma,
                             num_bytes, num_dma, wi, cseg);
 
        return NETDEV_TX_OK;
 
-dma_unmap_wqe_err:
+err_drop:
        sq->stats.dropped++;
-       mlx5e_dma_unmap_wqe_err(sq, wi->num_dma);
-
        dev_kfree_skb_any(skb);
 
        return NETDEV_TX_OK;