Author: hselasky
Date: Fri Sep 16 11:40:45 2016
New Revision: 305871
URL: https://svnweb.freebsd.org/changeset/base/305871
Log:
mlx5en: Optimise away duplicate UAR pointers.
This change also reduces the size of the mlx5e_sq structure so that the last
queue_state element will fit into the previous cacheline and then the mlx5e_sq
structure becomes one cacheline less for amd64.
Sponsored by: Mellanox Technologies
MFC after: 1 week
Modified:
head/sys/dev/mlx5/mlx5_en/en.h
head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c
Modified: head/sys/dev/mlx5/mlx5_en/en.h
==============================================================================
--- head/sys/dev/mlx5/mlx5_en/en.h Fri Sep 16 11:39:15 2016
(r305870)
+++ head/sys/dev/mlx5/mlx5_en/en.h Fri Sep 16 11:40:45 2016
(r305871)
@@ -528,8 +528,7 @@ struct mlx5e_sq {
/* read only */
struct mlx5_wq_cyc wq;
- void __iomem *uar_map;
- void __iomem *uar_bf_map;
+ struct mlx5_uar uar;
struct ifnet *ifp;
u32 sqn;
u32 bf_buf_size;
@@ -538,7 +537,6 @@ struct mlx5e_sq {
/* control path */
struct mlx5_wq_ctrl wq_ctrl;
- struct mlx5_uar uar;
struct mlx5e_priv *priv;
int tc;
unsigned int queue_state;
@@ -780,13 +778,13 @@ mlx5e_tx_notify_hw(struct mlx5e_sq *sq,
wmb();
if (bf_sz) {
- __iowrite64_copy(sq->uar_bf_map + ofst, wqe, bf_sz);
+ __iowrite64_copy(sq->uar.bf_map + ofst, wqe, bf_sz);
/* flush the write-combining mapped buffer */
wmb();
} else {
- mlx5_write64(wqe, sq->uar_map + ofst, NULL);
+ mlx5_write64(wqe, sq->uar.map + ofst, NULL);
}
sq->bf_offset ^= sq->bf_buf_size;
Modified: head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c
==============================================================================
--- head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c Fri Sep 16 11:39:15 2016
(r305870)
+++ head/sys/dev/mlx5/mlx5_en/mlx5_en_main.c Fri Sep 16 11:40:45 2016
(r305871)
@@ -956,8 +956,6 @@ mlx5e_create_sq(struct mlx5e_channel *c,
goto err_unmap_free_uar;
sq->wq.db = &sq->wq.db[MLX5_SND_DBR];
- sq->uar_map = sq->uar.map;
- sq->uar_bf_map = sq->uar.bf_map;
sq->bf_buf_size = (1 << MLX5_CAP_GEN(mdev, log_bf_reg_size)) / 2;
err = mlx5e_alloc_sq_db(sq);
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