netdev - [net-next PATCH] mlx5: handle DMA mapping error case for XDP redirect

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Message-ID: <153297294832.31547.16715215152984131209.stgit@firesoul>
Date:   Mon, 30 Jul 2018 19:49:08 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>
Cc:     netdev@...r.kernel.org, eugenia@...lanox.com,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: [net-next PATCH] mlx5: handle DMA mapping error case for XDP
 redirect

Commit 58b99ee3e3eb ("net/mlx5e: Add support for XDP_REDIRECT in device-out side")
forgot to return/free the xdp_frame in case the DMA mapping failed, correct this.

Also DMA unmap the frame in case mlx5e_xmit_xdp_frame() fails.

Fixes: 58b99ee3e3eb ("net/mlx5e: Add support for XDP_REDIRECT in device-out side")
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
index bab8cd44d1c5..1881468dbcfa 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -283,6 +283,7 @@ int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 		xdpi.dma_addr = dma_map_single(sq->pdev, xdpf->data, xdpf->len,
 					       DMA_TO_DEVICE);
 		if (unlikely(dma_mapping_error(sq->pdev, xdpi.dma_addr))) {
+			xdp_return_frame_rx_napi(xdpf);
 			drops++;
 			continue;
 		}
@@ -290,6 +291,8 @@ int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 		xdpi.xdpf = xdpf;
 
 		if (unlikely(!mlx5e_xmit_xdp_frame(sq, &xdpi))) {
+			dma_unmap_single(sq->pdev, xdpi.dma_addr,
+					 xdpf->len, DMA_TO_DEVICE);
 			xdp_return_frame_rx_napi(xdpf);
 			drops++;
 		}