On 7/3/23 11:13 AM, Eric Dumazet wrote: > diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c > index a2dbeb264f260e5b8923ece9aac99fe19ddfeb62..aa4133d1b1e0676e408499ea4534b51262394432 > 100644 > --- a/net/packet/af_packet.c > +++ b/net/packet/af_packet.c > @@ -2152,7 +2152,7 @@ static int packet_rcv(struct sk_buff *skb, > struct net_device *dev, > } > } > > - snaplen = skb->len; > + snaplen = skb->devmem ? skb_headlen(skb) : skb->len; > Ok, so you expect a flag on the skb noting the use of 'untouchable' memory. That aligns with my expectations based on POCs. Based on the above: 1) skb->head is expected to be host memory, and 2) the flag is a global for all frags, so no mix and match.
