xsk: move cq_cached_prod_lock to avoid touching a cacheline in sending path

We (Paolo and I) noticed that in the sending path touching an extra
cacheline due to cq_cached_prod_lock will impact the performance. After
moving the lock from struct xsk_buff_pool to struct xsk_queue, the
performance is increased by ~5% which can be observed by xdpsock.

An alternative approach [1] can be using atomic_try_cmpxchg() to have the
same effect. But unfortunately I don't have evident performance numbers to
prove the atomic approach is better than the current patch. The advantage
is to save the contention time among multiple xsks sharing the same pool
while the disadvantage is losing good maintenance. The full discussion can
be found at the following link.

[1]: https://lore.kernel.org/all/20251128134601.54678-1-kerneljasonxing@gmail.com/

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Link: https://patch.msgid.link/20260104012125.44003-3-kerneljasonxing@gmail.com
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h
index 92a2358..0b1abdb 100644 (file)
--- a/include/net/xsk_buff_pool.h
+++ b/include/net/xsk_buff_pool.h
@@ -90,11 +90,6 @@ struct xsk_buff_pool {
         * destructor callback.
         */
        spinlock_t cq_prod_lock;
-       /* Mutual exclusion of the completion ring in the SKB mode.
-        * Protect: when sockets share a single cq when the same netdev
-        * and queue id is shared.
-        */
-       spinlock_t cq_cached_prod_lock;
        struct xdp_buff_xsk *free_heads[];
 };
 

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 3c52faf..3b46bc6 100644 (file)
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -543,9 +543,9 @@ static int xsk_cq_reserve_locked(struct xsk_buff_pool *pool)
 {
        int ret;
 
-       spin_lock(&pool->cq_cached_prod_lock);
+       spin_lock(&pool->cq->cq_cached_prod_lock);
        ret = xskq_prod_reserve(pool->cq);
-       spin_unlock(&pool->cq_cached_prod_lock);
+       spin_unlock(&pool->cq->cq_cached_prod_lock);
 
        return ret;
 }
@@ -619,9 +619,9 @@ static void xsk_cq_submit_addr_locked(struct xsk_buff_pool *pool,
 
 static void xsk_cq_cancel_locked(struct xsk_buff_pool *pool, u32 n)
 {
-       spin_lock(&pool->cq_cached_prod_lock);
+       spin_lock(&pool->cq->cq_cached_prod_lock);
        xskq_prod_cancel_n(pool->cq, n);
-       spin_unlock(&pool->cq_cached_prod_lock);
+       spin_unlock(&pool->cq->cq_cached_prod_lock);
 }
 
 INDIRECT_CALLABLE_SCOPE

diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 6bf8431..cd5125b 100644 (file)
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -91,7 +91,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
        INIT_LIST_HEAD(&pool->xsk_tx_list);
        spin_lock_init(&pool->xsk_tx_list_lock);
        spin_lock_init(&pool->cq_prod_lock);
-       spin_lock_init(&pool->cq_cached_prod_lock);
+       spin_lock_init(&xs->cq_tmp->cq_cached_prod_lock);
        refcount_set(&pool->users, 1);
 
        pool->fq = xs->fq_tmp;

diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index 1eb8d9f..ec08d9c 100644 (file)
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h
@@ -46,6 +46,11 @@ struct xsk_queue {
        u64 invalid_descs;
        u64 queue_empty_descs;
        size_t ring_vmalloc_size;
+       /* Mutual exclusion of the completion ring in the SKB mode.
+        * Protect: when sockets share a single cq when the same netdev
+        * and queue id is shared.
+        */
+       spinlock_t cq_cached_prod_lock;
 };
 
 struct parsed_desc {