From: Björn Töpel <bjorn.to...@intel.com>
Prior this commit, when the struct socket object was being released,
the UMEM did not have its reference count decreased. Instead, this was
done in the struct sock sk_destruct function.
There is no reason to keep the UMEM reference around when the socket
is being orphaned, so in this patch the xdp_put_mem is called in the
xsk_release function. This results in that the xsk_destruct function
can be removed!
Note that, it still holds that a struct xsk_sock reference might still
linger in the XSKMAP after the UMEM is released, e.g. if a user does
not clear the XSKMAP prior to closing the process. This sock will be
in a "released" zombie like state, until the XSKMAP is removed.
Signed-off-by: Björn Töpel <bjorn.to...@intel.com>
---
net/xdp/xsk.c | 16 +---------------
1 file changed, 1 insertion(+), 15 deletions(-)
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 07156f43d295..a03268454a27 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -366,6 +366,7 @@ static int xsk_release(struct socket *sock)
xskq_destroy(xs->rx);
xskq_destroy(xs->tx);
+ xdp_put_umem(xs->umem);
sock_orphan(sk);
sock->sk = NULL;
@@ -713,18 +714,6 @@ static const struct proto_ops xsk_proto_ops = {
.sendpage = sock_no_sendpage,
};
-static void xsk_destruct(struct sock *sk)
-{
- struct xdp_sock *xs = xdp_sk(sk);
-
- if (!sock_flag(sk, SOCK_DEAD))
- return;
-
- xdp_put_umem(xs->umem);
-
- sk_refcnt_debug_dec(sk);
-}
-
static int xsk_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
@@ -751,9 +740,6 @@ static int xsk_create(struct net *net, struct socket *sock,
int protocol,
sk->sk_family = PF_XDP;
- sk->sk_destruct = xsk_destruct;
- sk_refcnt_debug_inc(sk);
-
sock_set_flag(sk, SOCK_RCU_FREE);
xs = xdp_sk(sk);
--
2.19.1
