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net: tso: add UDP segmentation support 

Note that like TCP, we do not support additional encapsulations,
and that checksums must be offloaded to the NIC.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2020-06-17 20:53:26 -07:00 committed by David S. Miller
parent 761b331cb6
commit 3d5b459ba0
1 changed files with 18 additions and 11 deletions
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29
net/core/tso.c
View File

@ -16,7 +16,6 @@ EXPORT_SYMBOL(tso_count_descs);
void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso, void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
int size, bool is_last) int size, bool is_last)
{ {
struct tcphdr *tcph;
int hdr_len = skb_transport_offset(skb) + tso->tlen; int hdr_len = skb_transport_offset(skb) + tso->tlen;
int mac_hdr_len = skb_network_offset(skb); int mac_hdr_len = skb_network_offset(skb);
@ -32,21 +31,29 @@ void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
iph->payload_len = htons(size + tso->tlen); iph->payload_len = htons(size + tso->tlen);
} }
tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb)); hdr += skb_transport_offset(skb);
put_unaligned_be32(tso->tcp_seq, &tcph->seq); if (tso->tlen != sizeof(struct udphdr)) {
struct tcphdr *tcph = (struct tcphdr *)hdr;
if (!is_last) { put_unaligned_be32(tso->tcp_seq, &tcph->seq);
/* Clear all special flags for not last packet */
tcph->psh = 0; if (!is_last) {
tcph->fin = 0; /* Clear all special flags for not last packet */
tcph->rst = 0; tcph->psh = 0;
tcph->fin = 0;
tcph->rst = 0;
}
} else {
struct udphdr *uh = (struct udphdr *)hdr;
uh->len = htons(sizeof(*uh) + size);
} }
} }
EXPORT_SYMBOL(tso_build_hdr); EXPORT_SYMBOL(tso_build_hdr);
void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size) void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size)
{ {
tso->tcp_seq += size; tso->tcp_seq += size; /* not worth avoiding this operation for UDP */
tso->size -= size; tso->size -= size;
tso->data += size; tso->data += size;
@ -64,12 +71,12 @@ EXPORT_SYMBOL(tso_build_data);
int tso_start(struct sk_buff *skb, struct tso_t *tso) int tso_start(struct sk_buff *skb, struct tso_t *tso)
{ {
int tlen = tcp_hdrlen(skb); int tlen = skb_is_gso_tcp(skb) ? tcp_hdrlen(skb) : sizeof(struct udphdr);
int hdr_len = skb_transport_offset(skb) + tlen; int hdr_len = skb_transport_offset(skb) + tlen;
tso->tlen = tlen; tso->tlen = tlen;
tso->ip_id = ntohs(ip_hdr(skb)->id); tso->ip_id = ntohs(ip_hdr(skb)->id);
tso->tcp_seq = ntohl(tcp_hdr(skb)->seq); tso->tcp_seq = (tlen != sizeof(struct udphdr)) ? ntohl(tcp_hdr(skb)->seq) : 0;
tso->next_frag_idx = 0; tso->next_frag_idx = 0;
tso->ipv6 = vlan_get_protocol(skb) == htons(ETH_P_IPV6); tso->ipv6 = vlan_get_protocol(skb) == htons(ETH_P_IPV6);