On Thu, Oct 8, 2020 at 3:06 PM David Wilder <dwil...@us.ibm.com> wrote:
>
> Ingress large send packets are identified by either:
> The IBMVETH_RXQ_LRG_PKT flag in the receive buffer
> or with a -1 placed in the ip header checksum.
> The method used depends on firmware version.
>
> Signed-off-by: David Wilder <dwil...@us.ibm.com>
> Reviewed-by: Thomas Falcon <tlfal...@linux.ibm.com>
> Reviewed-by: Cristobal Forno <cris.fo...@ibm.com>
> Reviewed-by: Pradeep Satyanarayana <prade...@linux.vnet.ibm.com>
> ---
> drivers/net/ethernet/ibm/ibmveth.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/ibm/ibmveth.c
> b/drivers/net/ethernet/ibm/ibmveth.c
> index 3935a7e..e357cbe 100644
> --- a/drivers/net/ethernet/ibm/ibmveth.c
> +++ b/drivers/net/ethernet/ibm/ibmveth.c
> @@ -1349,6 +1349,7 @@ static int ibmveth_poll(struct napi_struct *napi, int
> budget)
> int offset = ibmveth_rxq_frame_offset(adapter);
> int csum_good = ibmveth_rxq_csum_good(adapter);
> int lrg_pkt = ibmveth_rxq_large_packet(adapter);
> + __sum16 iph_check = 0;
>
> skb = ibmveth_rxq_get_buffer(adapter);
>
> @@ -1385,7 +1386,17 @@ static int ibmveth_poll(struct napi_struct *napi, int
> budget)
> skb_put(skb, length);
> skb->protocol = eth_type_trans(skb, netdev);
>
> - if (length > netdev->mtu + ETH_HLEN) {
> + /* PHYP without PLSO support places a -1 in the ip
> + * checksum for large send frames.
> + */
> + if (be16_to_cpu(skb->protocol) == ETH_P_IP) {
> + struct iphdr *iph = (struct iphdr *)skb->data;
> +
> + iph_check = iph->check;
Check against truncated/bad packets.
