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udp: Add support for doing checksum unnecessary conversion

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Add support for doing CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE
conversion in UDP tunneling path.

In the normal UDP path, we call skb_checksum_try_convert after locating
the UDP socket. The check is that checksum conversion is enabled for
the socket (new flag in UDP socket) and that checksum field is
non-zero.

In the UDP GRO path, we call skb_gro_checksum_try_convert after
checksum is validated and checksum field is non-zero. Since this is
already in GRO we assume that checksum conversion is always wanted.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2014-08-31 15:12:43 -07:00 • committed by David S. Miller
parent d96535a17d
commit 2abb7cdc0d
5 changed files with 58 additions and 17 deletions
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16
include/linux/udp.h
View file

@ -49,7 +49,11 @@ struct udp_sock {
unsigned int corkflag; /* Cork is required */
__u8 encap_type; /* Is this an Encapsulation socket? */
unsigned char no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
no_check6_rx:1;/* Allow zero UDP6 checksums on RX? */
no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */
convert_csum:1;/* On receive, convert checksum
* unnecessary to checksum complete
* if possible.
*/
/*
* Following member retains the information to create a UDP header
* when the socket is uncorked.
@ -98,6 +102,16 @@ static inline bool udp_get_no_check6_rx(struct sock *sk)
return udp_sk(sk)->no_check6_rx;
}
static inline void udp_set_convert_csum(struct sock *sk, bool val)
{
udp_sk(sk)->convert_csum = val;
}
static inline bool udp_get_convert_csum(struct sock *sk)
{
return udp_sk(sk)->convert_csum;
}
#define udp_portaddr_for_each_entry(__sk, node, list) \
hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)

4
net/ipv4/udp.c
View file

@ -1788,6 +1788,10 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
if (sk != NULL) {
int ret;
if (udp_sk(sk)->convert_csum && uh->check && !IS_UDPLITE(sk))
skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
inet_compute_pseudo);
ret = udp_queue_rcv_skb(sk, skb);
sock_put(sk);

25
net/ipv4/udp_offload.c
View file

@ -290,16 +290,25 @@ static struct sk_buff **udp4_gro_receive(struct sk_buff **head,
{
struct udphdr *uh = udp_gro_udphdr(skb);
/* Don't bother verifying checksum if we're going to flush anyway. */
if (unlikely(!uh) ||
(!NAPI_GRO_CB(skb)->flush &&
skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
inet_gro_compute_pseudo))) {
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
if (unlikely(!uh))
goto flush;
/* Don't bother verifying checksum if we're going to flush anyway. */
if (!NAPI_GRO_CB(skb)->flush)
goto skip;
if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
inet_gro_compute_pseudo))
goto flush;
else if (uh->check)
skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
inet_gro_compute_pseudo);
skip:
return udp_gro_receive(head, skb, uh);
flush:
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
int udp_gro_complete(struct sk_buff *skb, int nhoff)

4
net/ipv6/udp.c
View file

@ -891,6 +891,10 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
goto csum_error;
}
if (udp_sk(sk)->convert_csum && uh->check && !IS_UDPLITE(sk))
skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
ip6_compute_pseudo);
ret = udpv6_queue_rcv_skb(sk, skb);
sock_put(sk);

26
net/ipv6/udp_offload.c
View file

@ -134,16 +134,26 @@ static struct sk_buff **udp6_gro_receive(struct sk_buff **head,
{
struct udphdr *uh = udp_gro_udphdr(skb);
/* Don't bother verifying checksum if we're going to flush anyway. */
if (unlikely(!uh) ||
(!NAPI_GRO_CB(skb)->flush &&
skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
ip6_gro_compute_pseudo))) {
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
if (unlikely(!uh))
goto flush;
/* Don't bother verifying checksum if we're going to flush anyway. */
if (!NAPI_GRO_CB(skb)->flush)
goto skip;
if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
ip6_gro_compute_pseudo))
goto flush;
else if (uh->check)
skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
ip6_gro_compute_pseudo);
skip:
return udp_gro_receive(head, skb, uh);
flush:
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
int udp6_gro_complete(struct sk_buff *skb, int nhoff)