linux-kernel - [RFC net-next 2/6] mlx5: Use napi_affinity_no

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Message-Id: <20240812145633.52911-3-jdamato@fastly.com>
Date: Mon, 12 Aug 2024 14:56:23 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: Joe Damato <jdamato@...tly.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-rdma@...r.kernel.org (open list:MELLANOX MLX5 core VPI driver),
	linux-kernel@...r.kernel.org (open list)
Subject: [RFC net-next 2/6] mlx5: Use napi_affinity_no_change

Use napi_affinity_no_change instead of mlx5's internal implementation,
simplifying and centralizing the logic.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en.h      | 2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c | 9 +--------
 3 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 7832f6b6c8a8..c288e3f45a06 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -767,7 +767,7 @@ struct mlx5e_channel {
 	spinlock_t                 async_icosq_lock;
 
 	/* data path - accessed per napi poll */
-	const struct cpumask	  *aff_mask;
+	unsigned int		  irq;
 	struct mlx5e_ch_stats     *stats;
 
 	/* control */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 6f686fabed44..7b217aafbdfd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2684,8 +2684,8 @@ static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
 	c->mkey_be  = cpu_to_be32(mdev->mlx5e_res.hw_objs.mkey);
 	c->num_tc   = mlx5e_get_dcb_num_tc(params);
 	c->xdp      = !!params->xdp_prog;
+	c->irq      = irq;
 	c->stats    = &priv->channel_stats[ix]->ch;
-	c->aff_mask = irq_get_effective_affinity_mask(irq);
 	c->lag_port = mlx5e_enumerate_lag_port(mdev, ix);
 
 	netif_napi_add(netdev, &c->napi, mlx5e_napi_poll);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
index 5873fde65c2e..ee453d019c3b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
@@ -39,13 +39,6 @@
 #include "en/xsk/tx.h"
 #include "en_accel/ktls_txrx.h"
 
-static inline bool mlx5e_channel_no_affinity_change(struct mlx5e_channel *c)
-{
-	int current_cpu = smp_processor_id();
-
-	return cpumask_test_cpu(current_cpu, c->aff_mask);
-}
-
 static void mlx5e_handle_tx_dim(struct mlx5e_txqsq *sq)
 {
 	struct mlx5e_sq_stats *stats = sq->stats;
@@ -201,7 +194,7 @@ int mlx5e_napi_poll(struct napi_struct *napi, int budget)
 	busy |= busy_xsk;
 
 	if (busy) {
-		if (likely(mlx5e_channel_no_affinity_change(c))) {
+		if (likely(napi_affinity_no_change(c->irq))) {
 			work_done = budget;
 			goto out;
 		}
-- 
2.25.1