[net-next 02/17] net/mlx5e: Replace multiplication by stride size with a shift

[Saeed Mahameed]

From: Tariq Toukan <tar...@mellanox.com>

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 <tar...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en.h      | 2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++--
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h 
b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index d964db286c95..44bd8df905ca 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -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 {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 94761d0e1b33..7a25d952c922 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -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);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 1b50f1e7e48a..aa5cc1590859 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -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;
-- 
2.13.0