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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2024-02-02 19:32:20 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2024-02-14 01:10:29 +0300
commit2127c604383666675789fd4a5fc2aead46c73aad (patch)
tree02052833aea3ecc5810989ab53e4eeaa550c4a5f /net/xdp
parent11f522256e9043b0fcd2f994278645d3e201d20c (diff)
downloadlinux-2127c604383666675789fd4a5fc2aead46c73aad.tar.xz
xsk: Add truesize to skb_add_rx_frag().
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@linutronix.de> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Link: https://lore.kernel.org/bpf/20240202163221.2488589-1-bigeasy@linutronix.de
Diffstat (limited to 'net/xdp')
-rw-r--r--net/xdp/xsk.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 1eadfac03cc4..b78c0e095e22 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -722,7 +722,8 @@ 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) {