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net/mlx5e: Replace multiplication by stride size with a shift 

In RX data-path, use shift operations instead of a regular multiplication
by stride size, as it is a power of two.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2017-07-02 19:02:05 +03:00 committed by Saeed Mahameed
parent b45d8b50b8
commit 89e89f7a9f
3 changed files with 5 additions and 5 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -535,8 +535,8 @@ struct mlx5e_rq {
struct {
struct mlx5e_mpw_info *info;
void *mtt_no_align;
u16 stride_sz;
u16 num_strides;
u8 log_stride_sz;
} mpwqe;
};
struct {

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

@ -615,10 +615,10 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
goto err_rq_wq_destroy;
}
rq->mpwqe.stride_sz = BIT(params->mpwqe_log_stride_sz);
rq->mpwqe.log_stride_sz = params->mpwqe_log_stride_sz;
rq->mpwqe.num_strides = BIT(params->mpwqe_log_num_strides);
rq->buff.wqe_sz = rq->mpwqe.stride_sz * rq->mpwqe.num_strides;
rq->buff.wqe_sz = rq->mpwqe.num_strides << rq->mpwqe.log_stride_sz;
byte_count = rq->buff.wqe_sz;
err = mlx5e_create_rq_umr_mkey(mdev, rq);

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

@ -304,7 +304,7 @@ static inline void mlx5e_add_skb_frag_mpwqe(struct mlx5e_rq *rq,
u32 page_idx, u32 frag_offset,
u32 len)
{
unsigned int truesize = ALIGN(len, rq->mpwqe.stride_sz);
unsigned int truesize = ALIGN(len, BIT(rq->mpwqe.log_stride_sz));
dma_sync_single_for_cpu(rq->pdev,
wi->umr.dma_info[page_idx].addr + frag_offset,
@ -910,7 +910,7 @@ static inline void mlx5e_mpwqe_fill_rx_skb(struct mlx5e_rq *rq,
struct sk_buff *skb)
{
u16 stride_ix = mpwrq_get_cqe_stride_index(cqe);
u32 wqe_offset = stride_ix * rq->mpwqe.stride_sz;
u32 wqe_offset = stride_ix << rq->mpwqe.log_stride_sz;
u32 head_offset = wqe_offset & (PAGE_SIZE - 1);
u32 page_idx = wqe_offset >> PAGE_SHIFT;
u32 head_page_idx = page_idx;