netdev - [PATCH net-next 3/3] net/mlx4_en: use napi_complete

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Date:   Wed, 22 Apr 2020 09:13:29 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Luigi Rizzo <lrizzo@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 3/3] net/mlx4_en: use napi_complete_done() in TX completion

In order to benefit from the new napi_defer_hard_irqs feature,
we need to use napi_complete_done() variant in this driver.

RX path is already using it, this patch implements TX completion side.

mlx4_en_process_tx_cq() now returns the amount of retired packets,
instead of a boolean, so that mlx4_en_poll_tx_cq() can pass
this value to napi_complete_done().

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c   |  2 +-
 drivers/net/ethernet/mellanox/mlx4/en_tx.c   | 20 ++++++++++----------
 drivers/net/ethernet/mellanox/mlx4/mlx4_en.h |  4 ++--
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index db3552f2d0877e37ce8dcf215d4c273e91c2326c..7871392198130fa7d1a09baf26a0a00f1bf2e1f5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -946,7 +946,7 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 		xdp_tx_cq = priv->tx_cq[TX_XDP][cq->ring];
 		if (xdp_tx_cq->xdp_busy) {
 			clean_complete = mlx4_en_process_tx_cq(dev, xdp_tx_cq,
-							       budget);
+							       budget) < budget;
 			xdp_tx_cq->xdp_busy = !clean_complete;
 		}
 	}
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 4d5ca302c067126b8627cb4809485b45c10e2460..a99d3ed49ed684db5d5b90e78e0767f97ee6cc9d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -382,8 +382,8 @@ int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
 	return cnt;
 }
 
-bool mlx4_en_process_tx_cq(struct net_device *dev,
-			   struct mlx4_en_cq *cq, int napi_budget)
+int mlx4_en_process_tx_cq(struct net_device *dev,
+			  struct mlx4_en_cq *cq, int napi_budget)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	struct mlx4_cq *mcq = &cq->mcq;
@@ -405,7 +405,7 @@ bool mlx4_en_process_tx_cq(struct net_device *dev,
 	u32 ring_cons;
 
 	if (unlikely(!priv->port_up))
-		return true;
+		return 0;
 
 	netdev_txq_bql_complete_prefetchw(ring->tx_queue);
 
@@ -480,7 +480,7 @@ bool mlx4_en_process_tx_cq(struct net_device *dev,
 	WRITE_ONCE(ring->cons, ring_cons + txbbs_skipped);
 
 	if (cq->type == TX_XDP)
-		return done < budget;
+		return done;
 
 	netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
 
@@ -492,7 +492,7 @@ bool mlx4_en_process_tx_cq(struct net_device *dev,
 		ring->wake_queue++;
 	}
 
-	return done < budget;
+	return done;
 }
 
 void mlx4_en_tx_irq(struct mlx4_cq *mcq)
@@ -512,14 +512,14 @@ int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
 	struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 	struct net_device *dev = cq->dev;
 	struct mlx4_en_priv *priv = netdev_priv(dev);
-	bool clean_complete;
+	int work_done;
 
-	clean_complete = mlx4_en_process_tx_cq(dev, cq, budget);
-	if (!clean_complete)
+	work_done = mlx4_en_process_tx_cq(dev, cq, budget);
+	if (work_done >= budget)
 		return budget;
 
-	napi_complete(napi);
-	mlx4_en_arm_cq(priv, cq);
+	if (napi_complete_done(napi, work_done))
+		mlx4_en_arm_cq(priv, cq);
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index 630f15977f091c1e28eceb7b6bc33414a69d5694..9f5603612960303c5d9f37603d8f7e51ddee9ac6 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -737,8 +737,8 @@ int mlx4_en_process_rx_cq(struct net_device *dev,
 			  int budget);
 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget);
 int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget);
-bool mlx4_en_process_tx_cq(struct net_device *dev,
-			   struct mlx4_en_cq *cq, int napi_budget);
+int mlx4_en_process_tx_cq(struct net_device *dev,
+			  struct mlx4_en_cq *cq, int napi_budget);
 u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
 			 struct mlx4_en_tx_ring *ring,
 			 int index, u64 timestamp,
-- 
2.26.1.301.g55bc3eb7cb9-goog