Re: [PATCH v5 bpf-next 3/9] veth: Avoid drops by oversized packets when XDP is enabled
From: Jakub Kicinski <hidden>
Date: 2018-07-27 02:10:49
On Thu, 26 Jul 2018 23:40:26 +0900, Toshiaki Makita wrote:
+ max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM -
+ peer->hard_header_len -
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+ if (peer->mtu > max_mtu) {
+ NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP");
+ err = -ERANGE;
+ goto err;
+ }You need to add .ndo_change_mtu and check this condition there too.