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Date: Tue, 10 Feb 2015 16:30:33 -0800
From: Tom Herbert <therbert@...gle.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH net-next 7/7] gue: Use checksum partial with remote checksum offload
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@...gle.com>
---
include/uapi/linux/fou.h | 1 +
net/ipv4/fou.c | 28 ++++++++++++++++++++++------
2 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/include/uapi/linux/fou.h b/include/uapi/linux/fou.h
index 8df0689..c303588 100644
--- a/include/uapi/linux/fou.h
+++ b/include/uapi/linux/fou.h
@@ -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,
};
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index d320f57..ff069f6 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -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;
}
--
2.2.0.rc0.207.ga3a616c
--
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