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net/mlx5e: Add headroom only to the first fragment in legacy RQ

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Currently, rq->buff.headroom is applied to all fragments in legacy RQ.
In the linear mode, there is a non-zero headroom, but there is only one
fragment per packet. In the non-linear mode, the headroom is zero.

This commit changes the logic to apply the headroom only to the first
fragment. The current behavior remains the same for both linear and
non-linear modes. However, it allows the next commit to enable headroom
for the non-linear mode, which will be applied only to the first
fragment.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Maxim Mikityanskiy 2022-01-26 15:49:23 +02:00 committed by Saeed Mahameed
parent 7c3b4df594
commit c3cce0fff3
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
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@ -373,12 +373,15 @@ static int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe_cyc *wqe,
int i;
for (i = 0; i < rq->wqe.info.num_frags; i++, frag++) {
u16 headroom;
err = mlx5e_get_rx_frag(rq, frag);
if (unlikely(err))
goto free_frags;
headroom = i == 0 ? rq->buff.headroom : 0;
wqe->data[i].addr = cpu_to_be64(frag->di->addr +
frag->offset + rq->buff.headroom);
frag->offset + headroom);
}
return 0;