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net: add code for TCP fraglist GRO 

This implements fraglist GRO similar to how it's handled in UDP, however
no functional changes are added yet. The next change adds a heuristic for
using fraglist GRO instead of regular GRO.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Felix Fietkau 2024-05-02 10:44:44 +02:00 committed by Paolo Abeni
parent bee88cd5bd
commit 8d95dc474f
2 changed files with 30 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
net/ipv4/tcp_offload.c
View File

@ -334,6 +334,18 @@ found:
flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
flush |= skb_cmp_decrypted(p, skb);
if (unlikely(NAPI_GRO_CB(p)->is_flist)) {
flush |= (__force int)(flags ^ tcp_flag_word(th2));
flush |= skb->ip_summed != p->ip_summed;
flush |= skb->csum_level != p->csum_level;
flush |= NAPI_GRO_CB(p)->count >= 64;
if (flush || skb_gro_receive_list(p, skb))
mss = 1;
goto out_check_final;
}
if (flush || skb_gro_receive(p, skb)) {
mss = 1;
goto out_check_final;
@ -400,6 +412,15 @@ INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
const struct iphdr *iph = ip_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);
if (unlikely(NAPI_GRO_CB(skb)->is_flist)) {
skb_shinfo(skb)->gso_type |= SKB_GSO_FRAGLIST | SKB_GSO_TCPV4;
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
__skb_incr_checksum_unnecessary(skb);
return 0;
}
th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
iph->daddr, 0);

9
net/ipv6/tcpv6_offload.c
View File

@ -32,6 +32,15 @@ INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
const struct ipv6hdr *iph = ipv6_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);
if (unlikely(NAPI_GRO_CB(skb)->is_flist)) {
skb_shinfo(skb)->gso_type |= SKB_GSO_FRAGLIST | SKB_GSO_TCPV6;
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
__skb_incr_checksum_unnecessary(skb);
return 0;
}
th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
&iph->daddr, 0);
skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;