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-rw-r--r--net/xdp/xsk.c20
-rw-r--r--net/xdp/xsk_buff_pool.c1
-rw-r--r--net/xdp/xsk_queue.h6
3 files changed, 23 insertions, 4 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 56c46e5f57bc..310cfc68875a 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -212,6 +212,14 @@ static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len,
return 0;
}
+static bool xsk_tx_writeable(struct xdp_sock *xs)
+{
+ if (xskq_cons_present_entries(xs->tx) > xs->tx->nentries / 2)
+ return false;
+
+ return true;
+}
+
static bool xsk_is_bound(struct xdp_sock *xs)
{
if (READ_ONCE(xs->state) == XSK_BOUND) {
@@ -298,7 +306,8 @@ void xsk_tx_release(struct xsk_buff_pool *pool)
rcu_read_lock();
list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) {
__xskq_cons_release(xs->tx);
- xs->sk.sk_write_space(&xs->sk);
+ if (xsk_tx_writeable(xs))
+ xs->sk.sk_write_space(&xs->sk);
}
rcu_read_unlock();
}
@@ -495,7 +504,8 @@ static int xsk_generic_xmit(struct sock *sk)
out:
if (sent_frame)
- sk->sk_write_space(sk);
+ if (xsk_tx_writeable(xs))
+ sk->sk_write_space(sk);
mutex_unlock(&xs->mutex);
return err;
@@ -577,11 +587,13 @@ static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int fl
static __poll_t xsk_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait)
{
- __poll_t mask = datagram_poll(file, sock, wait);
+ __poll_t mask = 0;
struct sock *sk = sock->sk;
struct xdp_sock *xs = xdp_sk(sk);
struct xsk_buff_pool *pool;
+ sock_poll_wait(file, sock, wait);
+
if (unlikely(!xsk_is_bound(xs)))
return mask;
@@ -597,7 +609,7 @@ static __poll_t xsk_poll(struct file *file, struct socket *sock,
if (xs->rx && !xskq_prod_is_empty(xs->rx))
mask |= EPOLLIN | EPOLLRDNORM;
- if (xs->tx && !xskq_cons_is_full(xs->tx))
+ if (xs->tx && xsk_tx_writeable(xs))
mask |= EPOLLOUT | EPOLLWRNORM;
return mask;
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 556d82d03687..67a4494d63b6 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -174,6 +174,7 @@ static int __xp_assign_dev(struct xsk_buff_pool *pool,
if (!pool->dma_pages) {
WARN(1, "Driver did not DMA map zero-copy buffers");
+ err = -EINVAL;
goto err_unreg_xsk;
}
pool->umem->zc = true;
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index b936c46b1e16..4a9663aa7afe 100644
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h
@@ -307,6 +307,12 @@ static inline bool xskq_cons_is_full(struct xsk_queue *q)
q->nentries;
}
+static inline u32 xskq_cons_present_entries(struct xsk_queue *q)
+{
+ /* No barriers needed since data is not accessed */
+ return READ_ONCE(q->ring->producer) - READ_ONCE(q->ring->consumer);
+}
+
/* Functions for producers */
static inline u32 xskq_prod_nb_free(struct xsk_queue *q, u32 max)