netdev - [PATCH v7 14/23] net/mlx5e: Refactor doorbell function to allow avoiding a completion

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221025135958.6242-15-aaptel@nvidia.com>
Date:   Tue, 25 Oct 2022 16:59:49 +0300
From:   Aurelien Aptel <aaptel@...dia.com>
To:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        edumazet@...gle.com, pabeni@...hat.com, saeedm@...dia.com,
        tariqt@...dia.com, leon@...nel.org, linux-nvme@...ts.infradead.org,
        sagi@...mberg.me, hch@....de, kbusch@...nel.org, axboe@...com,
        chaitanyak@...dia.com
Cc:     smalin@...dia.com, aaptel@...dia.com, ogerlitz@...dia.com,
        yorayz@...dia.com, borisp@...dia.com, aurelien.aptel@...il.com,
        malin1024@...il.com
Subject: [PATCH v7 14/23] net/mlx5e: Refactor doorbell function to allow avoiding a completion

From: Or Gerlitz <ogerlitz@...dia.com>

Currently the doorbell function always asks for completion to be generated.

Refactor things such that all existing call sites are untouched and no
branching is added. This is done using inner function which can be invoked
directly in cases completion is not desired (as done in downstream patch).

No functional change here.

Signed-off-by: Or Gerlitz <ogerlitz@...dia.com>
Signed-off-by: Aurelien Aptel <aaptel@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index 30c456bfc1c8..101b7630b046 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -211,10 +211,10 @@ static inline u16 mlx5e_icosq_get_next_pi(struct mlx5e_icosq *sq, u16 size)
 }
 
 static inline void
-mlx5e_notify_hw(struct mlx5_wq_cyc *wq, u16 pc, void __iomem *uar_map,
-		struct mlx5_wqe_ctrl_seg *ctrl)
+__mlx5e_notify_hw(struct mlx5_wq_cyc *wq, u16 pc, void __iomem *uar_map,
+		  struct mlx5_wqe_ctrl_seg *ctrl, u8 cq_update)
 {
-	ctrl->fm_ce_se |= MLX5_WQE_CTRL_CQ_UPDATE;
+	ctrl->fm_ce_se |= cq_update;
 	/* ensure wqe is visible to device before updating doorbell record */
 	dma_wmb();
 
@@ -228,6 +228,13 @@ mlx5e_notify_hw(struct mlx5_wq_cyc *wq, u16 pc, void __iomem *uar_map,
 	mlx5_write64((__be32 *)ctrl, uar_map);
 }
 
+static inline void
+mlx5e_notify_hw(struct mlx5_wq_cyc *wq, u16 pc, void __iomem *uar_map,
+		struct mlx5_wqe_ctrl_seg *ctrl)
+{
+	__mlx5e_notify_hw(wq, pc, uar_map, ctrl, MLX5_WQE_CTRL_CQ_UPDATE);
+}
+
 static inline void mlx5e_cq_arm(struct mlx5e_cq *cq)
 {
 	struct mlx5_core_cq *mcq;
-- 
2.31.1