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net/mlx5e: XDP, Drop fragmented packets larger than MTU size

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XDP transmits fragmented packets that are larger than MTU size instead of
dropping those packets. The drop check that checks whether a packet is larger
than MTU is comparing MTU size against the linear part length only.

Adjust the drop check to compare MTU size against both linear and non-linear
part lengths to avoid transmitting fragmented packets larger than MTU size.

Fixes: 39a1665d16 ("net/mlx5e: Implement sending multi buffer XDP frames")
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Carolina Jubran 2023-11-23 16:11:20 +02:00 committed by Saeed Mahameed
parent be86106fd7
commit bcaf109f79
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
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@ -493,6 +493,7 @@ mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
dma_addr_t dma_addr = xdptxd->dma_addr;
u32 dma_len = xdptxd->len;
u16 ds_cnt, inline_hdr_sz;
unsigned int frags_size;
u8 num_wqebbs = 1;
int num_frags = 0;
bool inline_ok;
@ -503,8 +504,9 @@ mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
inline_ok = sq->min_inline_mode == MLX5_INLINE_MODE_NONE ||
dma_len >= MLX5E_XDP_MIN_INLINE;
frags_size = xdptxd->has_frags ? xdptxdf->sinfo->xdp_frags_size : 0;
if (unlikely(!inline_ok || sq->hw_mtu < dma_len)) {
if (unlikely(!inline_ok || sq->hw_mtu < dma_len + frags_size)) {
stats->err++;
return false;
}