netdev - [net-next 08/11] net/mlx5: DR, Use the right size when writing partial STE into HW

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Date:   Fri, 29 Jan 2021 18:26:15 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, Leon Romanovsky <leonro@...dia.com>,
        Yevgeny Kliteynik <kliteyn@...dia.com>,
        Erez Shitrit <erezsh@...dia.com>,
        Alex Vesker <valex@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 08/11] net/mlx5: DR, Use the right size when writing partial STE into HW

From: Yevgeny Kliteynik <kliteyn@...dia.com>

In these cases we need to update only the ctrl area of the STE.
So it is better to write only the control 32B and avoid copying
the unneeded reduced 48B (control 32B + tag 16B).

Signed-off-by: Erez Shitrit <erezsh@...dia.com>
Signed-off-by: Alex Vesker <valex@...dia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../ethernet/mellanox/mlx5/core/steering/dr_rule.c   | 12 ++++++++----
 .../ethernet/mellanox/mlx5/core/steering/dr_ste.c    |  2 +-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c
index ddcb7017e121..fcea2a21abe9 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c
@@ -30,7 +30,7 @@ static int dr_rule_append_to_miss_list(struct mlx5dr_ste_ctx *ste_ctx,
 				 mlx5dr_ste_get_icm_addr(new_last_ste));
 	list_add_tail(&new_last_ste->miss_list_node, miss_list);
 
-	mlx5dr_send_fill_and_append_ste_send_info(last_ste, DR_STE_SIZE_REDUCED,
+	mlx5dr_send_fill_and_append_ste_send_info(last_ste, DR_STE_SIZE_CTRL,
 						  0, last_ste->hw_ste,
 						  ste_info_last, send_list, true);
 
@@ -110,10 +110,14 @@ dr_rule_handle_one_ste_in_update_list(struct mlx5dr_ste_send_info *ste_info,
 				       ste_info->size, ste_info->offset);
 	if (ret)
 		goto out;
-	/* Copy data to ste, only reduced size, the last 16B (mask)
+
+	/* Copy data to ste, only reduced size or control, the last 16B (mask)
 	 * is already written to the hw.
 	 */
-	memcpy(ste_info->ste->hw_ste, ste_info->data, DR_STE_SIZE_REDUCED);
+	if (ste_info->size == DR_STE_SIZE_CTRL)
+		memcpy(ste_info->ste->hw_ste, ste_info->data, DR_STE_SIZE_CTRL);
+	else
+		memcpy(ste_info->ste->hw_ste, ste_info->data, DR_STE_SIZE_REDUCED);
 
 out:
 	kfree(ste_info);
@@ -456,7 +460,7 @@ dr_rule_rehash_htbl(struct mlx5dr_rule *rule,
 		ste_to_update = cur_htbl->pointing_ste;
 	}
 
-	mlx5dr_send_fill_and_append_ste_send_info(ste_to_update, DR_STE_SIZE_REDUCED,
+	mlx5dr_send_fill_and_append_ste_send_info(ste_to_update, DR_STE_SIZE_CTRL,
 						  0, ste_to_update->hw_ste, ste_info,
 						  update_list, false);
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c
index 0f318f409c91..e21b61030e35 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c
@@ -264,7 +264,7 @@ static void dr_ste_remove_middle_ste(struct mlx5dr_ste_ctx *ste_ctx,
 	miss_addr = ste_ctx->get_miss_addr(ste->hw_ste);
 	ste_ctx->set_miss_addr(prev_ste->hw_ste, miss_addr);
 
-	mlx5dr_send_fill_and_append_ste_send_info(prev_ste, DR_STE_SIZE_REDUCED, 0,
+	mlx5dr_send_fill_and_append_ste_send_info(prev_ste, DR_STE_SIZE_CTRL, 0,
 						  prev_ste->hw_ste, ste_info,
 						  send_ste_list, true /* Copy data*/);
 
-- 
2.29.2