From cc6d60ef92278a31ffc2e94966a0921b9646af18 Mon Sep 17 00:00:00 2001 From: Joshua Hay Date: Mon, 27 Jul 2026 16:08:48 -0700 Subject: [PATCH] idpf: account for VLAN header when parsing RSC packet header While parsing the header of a Receive Side Coalesced (RSC) packet, check if a VLAN tag is present and adjust the header parsing accordingly. Otherwise, Rx TCP traffic is completely broken for any VLAN interface whose underlying interface has RSC (rx-gro-hw) enabled. We only need to worry about one VLAN header since Rx packets with multiple VLAN headers are not candidates for RSC. Fixes: 3a8845af66edb ("idpf: add RX splitq napi poll support") Signed-off-by: Joshua Hay Reviewed-by: Emil Tantilov Reviewed-by: Aleksandr Loktionov Tested-by: Samuel Salin Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/idpf/idpf_txrx.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c index 9ba9c2952d78..4311ffa30bb1 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -3299,6 +3299,7 @@ static int idpf_rx_rsc(struct idpf_rx_queue *rxq, struct sk_buff *skb, struct libeth_rx_pt decoded) { u16 rsc_segments, rsc_seg_len; + u16 l3_start = 0; bool ipv4, ipv6; int len; @@ -3321,7 +3322,10 @@ static int idpf_rx_rsc(struct idpf_rx_queue *rxq, struct sk_buff *skb, NAPI_GRO_CB(skb)->count = rsc_segments; skb_shinfo(skb)->gso_size = rsc_seg_len; - skb_reset_network_header(skb); + if (unlikely(eth_type_vlan(skb->protocol))) + l3_start = VLAN_HLEN; + + skb_set_network_header(skb, l3_start); if (ipv4) { struct iphdr *ipv4h = ip_hdr(skb); @@ -3329,7 +3333,7 @@ static int idpf_rx_rsc(struct idpf_rx_queue *rxq, struct sk_buff *skb, skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; /* Reset and set transport header offset in skb */ - skb_set_transport_header(skb, sizeof(struct iphdr)); + skb_set_transport_header(skb, l3_start + sizeof(struct iphdr)); len = skb->len - skb_transport_offset(skb); /* Compute the TCP pseudo header checksum*/ @@ -3339,7 +3343,7 @@ static int idpf_rx_rsc(struct idpf_rx_queue *rxq, struct sk_buff *skb, struct ipv6hdr *ipv6h = ipv6_hdr(skb); skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; - skb_set_transport_header(skb, sizeof(struct ipv6hdr)); + skb_set_transport_header(skb, l3_start + sizeof(struct ipv6hdr)); len = skb->len - skb_transport_offset(skb); tcp_hdr(skb)->check = ~tcp_v6_check(len, &ipv6h->saddr, &ipv6h->daddr, 0);