redonkable/remarkable-linux
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gue: Use checksum partial with remote checksum offload

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Change remote checksum handling to set checksum partial as default
behavior. Added an iflink parameter to configure not using
checksum partial (calling csum_partial to update checksum).

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-02-10 16:30:33 -08:00 committed by David S. Miller
parent 0ace2ca89c
commit fe881ef11c
2 changed files with 23 additions and 6 deletions
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1
include/uapi/linux/fou.h
View file

@ -14,6 +14,7 @@ enum {
FOU_ATTR_AF, /* u8 */
FOU_ATTR_IPPROTO, /* u8 */
FOU_ATTR_TYPE, /* u8 */
FOU_ATTR_REMCSUM_NOPARTIAL, /* flag */
__FOU_ATTR_MAX,
};

28
net/ipv4/fou.c
View file

@ -22,14 +22,18 @@ static LIST_HEAD(fou_list);
struct fou {
struct socket *sock;
u8 protocol;
u8 flags;
u16 port;
struct udp_offload udp_offloads;
struct list_head list;
};
#define FOU_F_REMCSUM_NOPARTIAL BIT(0)
struct fou_cfg {
u16 type;
u8 protocol;
u8 flags;
struct udp_port_cfg udp_config;
};
@ -64,7 +68,8 @@ static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
}
static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr,
void *data, size_t hdrlen, u8 ipproto)
void *data, size_t hdrlen, u8 ipproto,
bool nopartial)
{
__be16 *pd = data;
size_t start = ntohs(pd[0]);
@ -75,7 +80,8 @@ static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr,
return NULL;
guehdr = (struct guehdr *)&udp_hdr(skb)[1];
skb_remcsum_process(skb, (void *)guehdr + hdrlen, start, offset, true);
skb_remcsum_process(skb, (void *)guehdr + hdrlen,
start, offset, nopartial);
return guehdr;
}
@ -136,7 +142,9 @@ static int gue_udp_recv(struct sock *sk, struct sk_buff *skb)
if (flags & GUE_PFLAG_REMCSUM) {
guehdr = gue_remcsum(skb, guehdr, data + doffset,
hdrlen, guehdr->proto_ctype);
hdrlen, guehdr->proto_ctype,
!!(fou->flags &
FOU_F_REMCSUM_NOPARTIAL));
if (!guehdr)
goto drop;
@ -209,7 +217,7 @@ out_unlock:
static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off,
struct guehdr *guehdr, void *data,
size_t hdrlen, u8 ipproto,
struct gro_remcsum *grc)
struct gro_remcsum *grc, bool nopartial)
{
__be16 *pd = data;
size_t start = ntohs(pd[0]);
@ -230,7 +238,7 @@ static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off,
}
skb_gro_remcsum_process(skb, (void *)guehdr + hdrlen,
start, offset, grc, true);
start, offset, grc, nopartial);
skb->remcsum_offload = 1;
@ -250,6 +258,7 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head,
void *data;
u16 doffset = 0;
int flush = 1;
struct fou *fou = container_of(uoff, struct fou, udp_offloads);
struct gro_remcsum grc;
skb_gro_remcsum_init(&grc);
@ -294,7 +303,9 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head,
if (flags & GUE_PFLAG_REMCSUM) {
guehdr = gue_gro_remcsum(skb, off, guehdr,
data + doffset, hdrlen,
guehdr->proto_ctype, &grc);
guehdr->proto_ctype, &grc,
!!(fou->flags &
FOU_F_REMCSUM_NOPARTIAL));
if (!guehdr)
goto out;
@ -455,6 +466,7 @@ static int fou_create(struct net *net, struct fou_cfg *cfg,
sk = sock->sk;
fou->flags = cfg->flags;
fou->port = cfg->udp_config.local_udp_port;
/* Initial for fou type */
@ -541,6 +553,7 @@ static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = {
[FOU_ATTR_AF] = { .type = NLA_U8, },
[FOU_ATTR_IPPROTO] = { .type = NLA_U8, },
[FOU_ATTR_TYPE] = { .type = NLA_U8, },
[FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, },
};
static int parse_nl_config(struct genl_info *info,
@ -571,6 +584,9 @@ static int parse_nl_config(struct genl_info *info,
if (info->attrs[FOU_ATTR_TYPE])
cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]);
if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL])
cfg->flags |= FOU_F_REMCSUM_NOPARTIAL;
return 0;
}