gro: change the BUG_ON() in gro_pull_from_frag0()

Replace the BUG_ON() which never fired with a DEBUG_NET_WARN_ON_ONCE()

$ scripts/bloat-o-meter -t vmlinux.1 vmlinux.2
add/remove: 2/2 grow/shrink: 1/1 up/down: 370/-254 (116)
Function                                     old     new   delta
gro_try_pull_from_frag0                        -     196    +196
napi_gro_frags                               771     929    +158
__pfx_gro_try_pull_from_frag0                  -      16     +16
__pfx_gro_pull_from_frag0                     16       -     -16
dev_gro_receive                             1514    1464     -50
gro_pull_from_frag0                          188       -    -188
Total: Before=22565899, After=22566015, chg +0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260122045720.1221017-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/gro.c b/net/core/gro.c
index 76f9c3712422109ad00f15f6804abf6a8b00db43..ad326c7cdc0a1f31c416ffe60cc492d3fcd7b050 100644 (file)
--- a/net/core/gro.c
+++ b/net/core/gro.c
@@ -415,7 +415,7 @@ static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
 {
        struct skb_shared_info *pinfo = skb_shinfo(skb);
 
-       BUG_ON(skb->end - skb->tail < grow);
+       DEBUG_NET_WARN_ON_ONCE(skb->end - skb->tail < grow);
 
        memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);