netdev - [net 01/15] net/mlx5e: Tx, Fix assumption of single WQEBB of NOP in cleanup flow

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Date:   Fri, 18 Oct 2019 19:38:02 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net 01/15] net/mlx5e: Tx, Fix assumption of single WQEBB of NOP in
 cleanup flow

From: Tariq Toukan <tariqt@...lanox.com>

Cited patch removed the assumption only in datapath.
Here we remove it also form control/cleanup flow.

Fixes: 9ab0233728ca ("net/mlx5e: Tx, Don't implicitly assume SKB-less wqe has one WQEBB")
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 6 +++++-
 drivers/net/ethernet/mellanox/mlx5/core/en_tx.c   | 4 ++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 7569287f8f3c..b476b007f093 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -1349,9 +1349,13 @@ static void mlx5e_deactivate_txqsq(struct mlx5e_txqsq *sq)
 	/* last doorbell out, godspeed .. */
 	if (mlx5e_wqc_has_room_for(wq, sq->cc, sq->pc, 1)) {
 		u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
+		struct mlx5e_tx_wqe_info *wi;
 		struct mlx5e_tx_wqe *nop;
 
-		sq->db.wqe_info[pi].skb = NULL;
+		wi = &sq->db.wqe_info[pi];
+
+		memset(wi, 0, sizeof(*wi));
+		wi->num_wqebbs = 1;
 		nop = mlx5e_post_nop(wq, sq->sqn, &sq->pc);
 		mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &nop->ctrl);
 	}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index d3a67a9b4eba..9094e9519db7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -550,8 +550,8 @@ void mlx5e_free_txqsq_descs(struct mlx5e_txqsq *sq)
 		wi = &sq->db.wqe_info[ci];
 		skb = wi->skb;
 
-		if (!skb) { /* nop */
-			sq->cc++;
+		if (!skb) {
+			sq->cc += wi->num_wqebbs;
 			continue;
 		}
 
-- 
2.21.0