linux-kernel - [RFC net-next 6/6] mlx4: Use napi_affinity_no

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Message-Id: <20240812145633.52911-7-jdamato@fastly.com>
Date: Mon, 12 Aug 2024 14:56:27 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: Joe Damato <jdamato@...tly.com>,
	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>,
	Yishai Hadas <yishaih@...dia.com>,
	linux-rdma@...r.kernel.org (open list:MELLANOX MLX4 core VPI driver),
	linux-kernel@...r.kernel.org (open list)
Subject: [RFC net-next 6/6] mlx4: Use napi_affinity_no_change

Use napi_affinity_no_change instead of mlx4's internal implementation,
simplifying and centralizing the logic.

To support this, some type changes were made, which might have been bugs:
  - mlx4_eq_get_irq should return unsigned int (since the field it
    returns is u16)
  - fix the type of irq (from int to unsigned int) in mlx4_en_activate_cq

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_cq.c   | 6 ++++--
 drivers/net/ethernet/mellanox/mlx4/en_rx.c   | 6 +-----
 drivers/net/ethernet/mellanox/mlx4/eq.c      | 2 +-
 drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 1 +
 include/linux/mlx4/device.h                  | 2 +-
 5 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_cq.c b/drivers/net/ethernet/mellanox/mlx4/en_cq.c
index 461cc2c79c71..9c3e1c810412 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_cq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_cq.c
@@ -90,9 +90,10 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
 			int cq_idx)
 {
 	struct mlx4_en_dev *mdev = priv->mdev;
-	int irq, err = 0;
-	int timestamp_en = 0;
 	bool assigned_eq = false;
+	int timestamp_en = 0;
+	unsigned int irq;
+	int err = 0;
 
 	cq->dev = mdev->pndev[priv->port];
 	cq->mcq.set_ci_db  = cq->wqres.db.db;
@@ -144,6 +145,7 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
 		goto free_eq;
 
 	cq->cq_idx = cq_idx;
+	cq->irq = irq;
 	cq->mcq.event = mlx4_en_cq_event;
 
 	switch (cq->type) {
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 15c57e9517e9..4c296327b75b 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -1022,14 +1022,10 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 
 	/* If we used up all the quota - we're probably not done yet... */
 	if (done == budget || !clean_complete) {
-		int cpu_curr;
-
 		/* in case we got here because of !clean_complete */
 		done = budget;
 
-		cpu_curr = smp_processor_id();
-
-		if (likely(cpumask_test_cpu(cpu_curr, cq->aff_mask)))
+		if (likely(napi_affinity_no_change(cq->irq)))
 			return budget;
 
 		/* Current cpu is not according to smp_irq_affinity -
diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
index 9572a45f6143..feca4ea30750 100644
--- a/drivers/net/ethernet/mellanox/mlx4/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
@@ -1539,7 +1539,7 @@ int mlx4_assign_eq(struct mlx4_dev *dev, u8 port, int *vector)
 }
 EXPORT_SYMBOL(mlx4_assign_eq);
 
-int mlx4_eq_get_irq(struct mlx4_dev *dev, int cq_vec)
+unsigned int mlx4_eq_get_irq(struct mlx4_dev *dev, int cq_vec)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index 28b70dcc652e..1f9830b23c9c 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -381,6 +381,7 @@ struct mlx4_en_cq {
 
 	const struct cpumask *aff_mask;
 	int cq_idx;
+	unsigned int irq;
 };
 
 struct mlx4_en_port_profile {
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 27f42f713c89..1f2e9e954768 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -1433,7 +1433,7 @@ int mlx4_assign_eq(struct mlx4_dev *dev, u8 port, int *vector);
 void mlx4_release_eq(struct mlx4_dev *dev, int vec);
 
 int mlx4_is_eq_shared(struct mlx4_dev *dev, int vector);
-int mlx4_eq_get_irq(struct mlx4_dev *dev, int vec);
+unsigned int mlx4_eq_get_irq(struct mlx4_dev *dev, int vec);
 
 int mlx4_get_phys_port_id(struct mlx4_dev *dev);
 int mlx4_wol_read(struct mlx4_dev *dev, u64 *config, int port);
-- 
2.25.1