xsk_build_skb() allocates a page and adds it to the skb via
skb_add_rx_frag() and specifies 0 for truesize. This leads to a warning
in skb_add_rx_frag() with CONFIG_DEBUG_NET enabled because size is
larger than truesize.
Increasing truesize requires to add the same amount to socket's
sk_wmem_alloc counter in order not to underflow the counter during
release in the destructor (sock_wfree()).
Pass the size of the allocated page as truesize to skb_add_rx_frag().
Add this mount to socket's sk_wmem_alloc counter.
Fixes: cf24f5a5feea ("xsk: add support for AF_XDP multi-buffer on Tx path")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
Noticed by running test_xsk.sh
net/xdp/xsk.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 0348e4bde23b2..3050739cfe1e0 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -744,7 +744,8 @@ static struct sk_buff *xsk_build_skb(struct xdp_sock *xs,
memcpy(vaddr, buffer, len);
kunmap_local(vaddr);
- skb_add_rx_frag(skb, nr_frags, page, 0, len, 0);
+ skb_add_rx_frag(skb, nr_frags, page, 0, len, PAGE_SIZE);
+ refcount_add(PAGE_SIZE, &xs->sk.sk_wmem_alloc);
}
if (first_frag && desc->options & XDP_TX_METADATA) {
--
2.43.0
