diff mbox series

[net-next,09/12] net/mlx5e: SHAMPO, Fix page_index calculation inconsistency

Message ID 20241107194357.683732-10-tariqt@nvidia.com (mailing list archive)
State Accepted
Commit 1a4b5885770401b7e8de6546760686dcd2d9b784
Delegated to: Netdev Maintainers
Headers show
Series mlx5 esw qos refactor and SHAMPO cleanup | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 3 this patch: 3
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 1 maintainers not CCed: linux-rdma@vger.kernel.org
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 5 this patch: 5
netdev/checkpatch warning WARNING: line length of 83 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-11-11--21-00 (tests: 787)

Commit Message

Tariq Toukan Nov. 7, 2024, 7:43 p.m. UTC 
From: Dragos Tatulea <dtatulea@nvidia.com>

When calculating the index for the next frag page slot, the divisor is
incorrect: it should be the number of pages per queue not the number of
headers per queue. This is currently harmless because frag pages are not
used directly, but they are intermediated through the info array. But it
needs to be fixed as an upcoming patch will get rid of the info array.

This patch introduces a new pages per queue variable and plugs it in the
formula.

Now that this variable exists, additional code can be simplified in the
SHAMPO initialization code.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en.h      | 1 +
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 8 +++-----
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   | 2 +-
 3 files changed, 5 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 4449a57ba5b2..b4abb094f01a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -629,6 +629,7 @@  struct mlx5e_shampo_hd {
 	u16 curr_page_index;
 	u32 hd_per_wq;
 	u16 hd_per_wqe;
+	u16 pages_per_wq;
 	unsigned long *bitmap;
 	u16 pi;
 	u16 ci;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 59d7a0e28f24..3ca1ef1f39a5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -767,8 +767,6 @@  static int mlx5_rq_shampo_alloc(struct mlx5_core_dev *mdev,
 				u32 *pool_size,
 				int node)
 {
-	void *wqc = MLX5_ADDR_OF(rqc, rqp->rqc, wq);
-	int wq_size;
 	int err;
 
 	if (!test_bit(MLX5E_RQ_STATE_SHAMPO, &rq->state))
@@ -793,9 +791,9 @@  static int mlx5_rq_shampo_alloc(struct mlx5_core_dev *mdev,
 		cpu_to_be32(rq->mpwqe.shampo->mkey);
 	rq->mpwqe.shampo->hd_per_wqe =
 		mlx5e_shampo_hd_per_wqe(mdev, params, rqp);
-	wq_size = BIT(MLX5_GET(wq, wqc, log_wq_sz));
-	*pool_size += (rq->mpwqe.shampo->hd_per_wqe * wq_size) /
-		     MLX5E_SHAMPO_WQ_HEADER_PER_PAGE;
+	rq->mpwqe.shampo->pages_per_wq =
+		rq->mpwqe.shampo->hd_per_wq / MLX5E_SHAMPO_WQ_HEADER_PER_PAGE;
+	*pool_size += rq->mpwqe.shampo->pages_per_wq;
 	return 0;
 
 err_hw_gro_data:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index e044e5d11f05..76a975667c77 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -671,7 +671,7 @@  static int mlx5e_build_shampo_hd_umr(struct mlx5e_rq *rq,
 		header_offset = (index & (MLX5E_SHAMPO_WQ_HEADER_PER_PAGE - 1)) <<
 			MLX5E_SHAMPO_LOG_MAX_HEADER_ENTRY_SIZE;
 		if (!(header_offset & (PAGE_SIZE - 1))) {
-			page_index = (page_index + 1) & (shampo->hd_per_wq - 1);
+			page_index = (page_index + 1) & (shampo->pages_per_wq - 1);
 			frag_page = &shampo->pages[page_index];
 
 			err = mlx5e_page_alloc_fragmented(rq, frag_page);