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net/mlx5e: Build SKB with exact frag_size 

Build the SKB over the receive packet instead of the
whole page. Getting the SKB's linear data and shared_info
closer improves locality.
In addition, this opens up the possibility to make use of
other parts of the page in the downstream page-reuse patch.

Fixes: 1bfecfca56 ("net/mlx5e: Build RX SKB on demand")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2017-01-18 14:28:53 +02:00 committed by Saeed Mahameed
parent 3d09198243
commit 78aedd3279
3 changed files with 6 additions and 6 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -72,6 +72,8 @@
#define MLX5E_PARAMS_MAXIMUM_LOG_RQ_SIZE_MPW 0x6
#define MLX5_RX_HEADROOM NET_SKB_PAD
#define MLX5_SKB_FRAG_SZ(len) (SKB_DATA_ALIGN(len) + \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define MLX5_MPWRQ_MIN_LOG_STRIDE_SZ(mdev) \
(6 + MLX5_CAP_GEN(mdev, cache_line_128byte)) /* HW restriction */

6
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -639,11 +639,7 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
byte_count = rq->buff.wqe_sz;
/* calc the required page order */
frag_sz = rq->rx_headroom +
byte_count /* packet data */ +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
frag_sz = SKB_DATA_ALIGN(frag_sz);
frag_sz = MLX5_SKB_FRAG_SZ(rq->rx_headroom + byte_count);
npages = DIV_ROUND_UP(frag_sz, PAGE_SIZE);
rq->buff.page_order = order_base_2(npages);

4
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
View File

@ -740,6 +740,7 @@ struct sk_buff *skb_from_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe,
void *va, *data;
u16 rx_headroom = rq->rx_headroom;
bool consumed;
u32 frag_size;
di = &rq->dma_info[wqe_counter];
va = page_address(di->page);
@ -764,7 +765,8 @@ struct sk_buff *skb_from_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe,
if (consumed)
return NULL; /* page/packet was consumed by XDP */
skb = build_skb(va, RQ_PAGE_SIZE(rq));
frag_size = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt);
skb = build_skb(va, frag_size);
if (unlikely(!skb)) {
rq->stats.buff_alloc_err++;
mlx5e_page_release(rq, di, true);