netdev - [PATCH net-next v2 09/11] net: designate XSK pool pointers in queues as "ops protected"

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Message-ID: <20250324224537.248800-10-kuba@kernel.org>
Date: Mon, 24 Mar 2025 15:45:35 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	sdf@...ichev.me,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2 09/11] net: designate XSK pool pointers in queues as "ops protected"

Read accesses go via xsk_get_pool_from_qid(), the call coming
from the core and gve look safe (other "ops locked" drivers
don't support XSK).

Write accesses go via xsk_reg_pool_at_qid() and xsk_clear_pool_at_qid().
Former is already under the ops lock, latter needs to be locked when
coming from the workqueue via xp_clear_dev().

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
v2:
 - only clear if netdev still set
v1: https://lore.kernel.org/20250312223507.805719-10-kuba@kernel.org
---
 include/linux/netdevice.h     | 1 +
 include/net/netdev_rx_queue.h | 6 +++---
 net/xdp/xsk_buff_pool.c       | 7 ++++++-
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index fd508e9f148c..15f8b596da66 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -688,6 +688,7 @@ struct netdev_queue {
 	/* Subordinate device that the queue has been assigned to */
 	struct net_device	*sb_dev;
 #ifdef CONFIG_XDP_SOCKETS
+	/* "ops protected", see comment about net_device::lock */
 	struct xsk_buff_pool    *pool;
 #endif
 
diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
index b2238b551dce..8cdcd138b33f 100644
--- a/include/net/netdev_rx_queue.h
+++ b/include/net/netdev_rx_queue.h
@@ -20,12 +20,12 @@ struct netdev_rx_queue {
 	struct net_device		*dev;
 	netdevice_tracker		dev_tracker;
 
+	/* All fields below are "ops protected",
+	 * see comment about net_device::lock
+	 */
 #ifdef CONFIG_XDP_SOCKETS
 	struct xsk_buff_pool            *pool;
 #endif
-	/* NAPI instance for the queue
-	 * "ops protected", see comment about net_device::lock
-	 */
 	struct napi_struct		*napi;
 	struct pp_memory_provider_params mp_params;
 } ____cacheline_aligned_in_smp;
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 25a76c5ce0f1..c7e50fd86c6a 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -279,9 +279,14 @@ static void xp_release_deferred(struct work_struct *work)
 {
 	struct xsk_buff_pool *pool = container_of(work, struct xsk_buff_pool,
 						  work);
+	struct net_device *netdev = pool->netdev;
 
 	rtnl_lock();
-	xp_clear_dev(pool);
+	if (netdev) {
+		netdev_lock_ops(netdev);
+		xp_clear_dev(pool);
+		netdev_unlock_ops(netdev);
+	}
 	rtnl_unlock();
 
 	if (pool->fq) {
-- 
2.49.0