net/mlx5e: SHAMPO, Fix page_index calculation inconsistency

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>
Link: https://patch.msgid.link/20241107194357.683732-10-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 4449a57..b4abb09 100644 (file)
--- 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 59d7a0e..3ca1ef1 100644 (file)
--- 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 e044e5d..76a9756 100644 (file)
--- 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);