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net: add support for segmenting TCP fraglist GSO packets 

Preparation for adding TCP fraglist GRO support. It expects packets to be
combined in a similar way as UDP fraglist GSO packets.
For IPv4 packets, NAT is handled in the same way as UDP fraglist GSO.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
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 10:44:43 +02:00 committed by Paolo Abeni
parent 8928756d53
commit bee88cd5bd
2 changed files with 125 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
net/ipv4/tcp_offload.c
View File

@ -28,6 +28,70 @@ static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
}
}
static void __tcpv4_gso_segment_csum(struct sk_buff *seg,
__be32 *oldip, __be32 newip,
__be16 *oldport, __be16 newport)
{
struct tcphdr *th;
struct iphdr *iph;
if (*oldip == newip && *oldport == newport)
return;
th = tcp_hdr(seg);
iph = ip_hdr(seg);
inet_proto_csum_replace4(&th->check, seg, *oldip, newip, true);
inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false);
*oldport = newport;
csum_replace4(&iph->check, *oldip, newip);
*oldip = newip;
}
static struct sk_buff *__tcpv4_gso_segment_list_csum(struct sk_buff *segs)
{
const struct tcphdr *th;
const struct iphdr *iph;
struct sk_buff *seg;
struct tcphdr *th2;
struct iphdr *iph2;
seg = segs;
th = tcp_hdr(seg);
iph = ip_hdr(seg);
th2 = tcp_hdr(seg->next);
iph2 = ip_hdr(seg->next);
if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) &&
iph->daddr == iph2->daddr && iph->saddr == iph2->saddr)
return segs;
while ((seg = seg->next)) {
th2 = tcp_hdr(seg);
iph2 = ip_hdr(seg);
__tcpv4_gso_segment_csum(seg,
&iph2->saddr, iph->saddr,
&th2->source, th->source);
__tcpv4_gso_segment_csum(seg,
&iph2->daddr, iph->daddr,
&th2->dest, th->dest);
}
return segs;
}
static struct sk_buff *__tcp4_gso_segment_list(struct sk_buff *skb,
netdev_features_t features)
{
skb = skb_segment_list(skb, features, skb_mac_header_len(skb));
if (IS_ERR(skb))
return skb;
return __tcpv4_gso_segment_list_csum(skb);
}
static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
@ -37,6 +101,9 @@ static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
return ERR_PTR(-EINVAL);
if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST)
return __tcp4_gso_segment_list(skb, features);
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
const struct iphdr *iph = ip_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);

58
net/ipv6/tcpv6_offload.c
View File

@ -40,6 +40,61 @@ INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
return 0;
}
static void __tcpv6_gso_segment_csum(struct sk_buff *seg,
__be16 *oldport, __be16 newport)
{
struct tcphdr *th;
if (*oldport == newport)
return;
th = tcp_hdr(seg);
inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false);
*oldport = newport;
}
static struct sk_buff *__tcpv6_gso_segment_list_csum(struct sk_buff *segs)
{
const struct tcphdr *th;
const struct ipv6hdr *iph;
struct sk_buff *seg;
struct tcphdr *th2;
struct ipv6hdr *iph2;
seg = segs;
th = tcp_hdr(seg);
iph = ipv6_hdr(seg);
th2 = tcp_hdr(seg->next);
iph2 = ipv6_hdr(seg->next);
if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) &&
ipv6_addr_equal(&iph->saddr, &iph2->saddr) &&
ipv6_addr_equal(&iph->daddr, &iph2->daddr))
return segs;
while ((seg = seg->next)) {
th2 = tcp_hdr(seg);
iph2 = ipv6_hdr(seg);
iph2->saddr = iph->saddr;
iph2->daddr = iph->daddr;
__tcpv6_gso_segment_csum(seg, &th2->source, th->source);
__tcpv6_gso_segment_csum(seg, &th2->dest, th->dest);
}
return segs;
}
static struct sk_buff *__tcp6_gso_segment_list(struct sk_buff *skb,
netdev_features_t features)
{
skb = skb_segment_list(skb, features, skb_mac_header_len(skb));
if (IS_ERR(skb))
return skb;
return __tcpv6_gso_segment_list_csum(skb);
}
static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
@ -51,6 +106,9 @@ static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
if (!pskb_may_pull(skb, sizeof(*th)))
return ERR_PTR(-EINVAL);
if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST)
return __tcp6_gso_segment_list(skb, features);
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);