netdev - [PATCH bpf-next 6/6] xsk: use xsk_buff

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Message-Id: <20241002155441.253956-7-maciej.fijalkowski@intel.com>
Date: Wed,  2 Oct 2024 17:54:41 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: bpf@...r.kernel.org,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org
Cc: netdev@...r.kernel.org,
	magnus.karlsson@...el.com,
	bjorn@...nel.org,
	maciej.fijalkowski@...el.com
Subject: [PATCH bpf-next 6/6] xsk: use xsk_buff_pool directly for cq functions

Currently xsk_cq_{reserve_addr,submit,cancel}_locked() take xdp_sock as
an input argument but it is only used for pulling out xsk_buff_pool
pointer from it.

Change mentioned functions to take pool pointer as an input argument to
avoid unnecessary dereferences.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
 net/xdp/xsk.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 6c31c1de1619..7d7e37f53708 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -527,34 +527,34 @@ static int xsk_wakeup(struct xdp_sock *xs, u8 flags)
 	return dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags);
 }
 
-static int xsk_cq_reserve_addr_locked(struct xdp_sock *xs, u64 addr)
+static int xsk_cq_reserve_addr_locked(struct xsk_buff_pool *pool, u64 addr)
 {
 	unsigned long flags;
 	int ret;
 
-	spin_lock_irqsave(&xs->pool->cq_lock, flags);
-	ret = xskq_prod_reserve_addr(xs->pool->cq, addr);
-	spin_unlock_irqrestore(&xs->pool->cq_lock, flags);
+	spin_lock_irqsave(&pool->cq_lock, flags);
+	ret = xskq_prod_reserve_addr(pool->cq, addr);
+	spin_unlock_irqrestore(&pool->cq_lock, flags);
 
 	return ret;
 }
 
-static void xsk_cq_submit_locked(struct xdp_sock *xs, u32 n)
+static void xsk_cq_submit_locked(struct xsk_buff_pool *pool, u32 n)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&xs->pool->cq_lock, flags);
-	xskq_prod_submit_n(xs->pool->cq, n);
-	spin_unlock_irqrestore(&xs->pool->cq_lock, flags);
+	spin_lock_irqsave(&pool->cq_lock, flags);
+	xskq_prod_submit_n(pool->cq, n);
+	spin_unlock_irqrestore(&pool->cq_lock, flags);
 }
 
-static void xsk_cq_cancel_locked(struct xdp_sock *xs, u32 n)
+static void xsk_cq_cancel_locked(struct xsk_buff_pool *pool, u32 n)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&xs->pool->cq_lock, flags);
-	xskq_prod_cancel_n(xs->pool->cq, n);
-	spin_unlock_irqrestore(&xs->pool->cq_lock, flags);
+	spin_lock_irqsave(&pool->cq_lock, flags);
+	xskq_prod_cancel_n(pool->cq, n);
+	spin_unlock_irqrestore(&pool->cq_lock, flags);
 }
 
 static u32 xsk_get_num_desc(struct sk_buff *skb)
@@ -571,7 +571,7 @@ static void xsk_destruct_skb(struct sk_buff *skb)
 		*compl->tx_timestamp = ktime_get_tai_fast_ns();
 	}
 
-	xsk_cq_submit_locked(xdp_sk(skb->sk), xsk_get_num_desc(skb));
+	xsk_cq_submit_locked(xdp_sk(skb->sk)->pool, xsk_get_num_desc(skb));
 	sock_wfree(skb);
 }
 
@@ -587,7 +587,7 @@ static void xsk_consume_skb(struct sk_buff *skb)
 	struct xdp_sock *xs = xdp_sk(skb->sk);
 
 	skb->destructor = sock_wfree;
-	xsk_cq_cancel_locked(xs, xsk_get_num_desc(skb));
+	xsk_cq_cancel_locked(xs->pool, xsk_get_num_desc(skb));
 	/* Free skb without triggering the perf drop trace */
 	consume_skb(skb);
 	xs->skb = NULL;
@@ -765,7 +765,7 @@ static struct sk_buff *xsk_build_skb(struct xdp_sock *xs,
 		xskq_cons_release(xs->tx);
 	} else {
 		/* Let application retry */
-		xsk_cq_cancel_locked(xs, 1);
+		xsk_cq_cancel_locked(xs->pool, 1);
 	}
 
 	return ERR_PTR(err);
@@ -802,7 +802,7 @@ static int __xsk_generic_xmit(struct sock *sk)
 		 * if there is space in it. This avoids having to implement
 		 * any buffering in the Tx path.
 		 */
-		if (xsk_cq_reserve_addr_locked(xs, desc.addr))
+		if (xsk_cq_reserve_addr_locked(xs->pool, desc.addr))
 			goto out;
 
 		skb = xsk_build_skb(xs, &desc);
-- 
2.34.1