From: Willem de Bruijn <willemb@xxxxxxxxxx>
Zerocopy support for udp also enables it for some raw sockets. Only
raw sockets that have hdrinc set take a different path. Add zerocopy
support for this variant.
Tested:
msg_zerocopy.sh 4 raw_hdrincl:
without zerocopy
tx=150438 (9390 MB) txc=0 zc=n
rx=150438 (9387 MB)
with zerocopy
tx=292454 (18255 MB) txc=292454 zc=y
rx=292454 (18250 MB)
Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
---
net/ipv4/raw.c | 23 +++++++++++++++++++----
net/ipv6/raw.c | 20 +++++++++++++++++---
2 files changed, 36 insertions(+), 7 deletions(-)
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index bdffad875691..0a5a3f2ce81b 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -351,7 +351,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
unsigned int iphlen;
int err;
struct rtable *rt = *rtp;
- int hlen, tlen;
+ int hlen, tlen, linear;
if (length > rt->dst.dev->mtu) {
ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
@@ -366,8 +366,14 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
hlen = LL_RESERVED_SPACE(rt->dst.dev);
tlen = rt->dst.dev->needed_tailroom;
+ linear = length;
+
+ if (flags & MSG_ZEROCOPY &&
+ rt->dst.dev->features & NETIF_F_SG)
+ linear = min_t(int, linear, MAX_HEADER);
+
skb = sock_alloc_send_skb(sk,
- length + hlen + tlen + 15,
+ linear + hlen + tlen + 15,
flags & MSG_DONTWAIT, &err);
if (!skb)
goto error;
@@ -380,7 +386,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
skb_reset_network_header(skb);
iph = ip_hdr(skb);
- skb_put(skb, length);
+ skb_put(skb, linear);
skb->ip_summed = CHECKSUM_NONE;
@@ -391,7 +397,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
skb->transport_header = skb->network_header;
err = -EFAULT;
- if (memcpy_from_msg(iph, msg, length))
+ if (memcpy_from_msg(iph, msg, linear))
goto error_free;
iphlen = iph->ihl * 4;
@@ -423,6 +429,13 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
skb_transport_header(skb))->type);
}
+ if (flags & MSG_ZEROCOPY) {
+ err = skb_zerocopy_iter_alloc(skb, (void *)&msg,
+ length - linear);
+ if (err)
+ goto error_zcopy;
+ }
+
err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
net, sk, skb, NULL, rt->dst.dev,
dst_output);
@@ -433,6 +446,8 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
out:
return 0;
+error_zcopy:
+ skb_zcopy_abort(skb);
error_free:
kfree_skb(skb);
error:
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 60be012fe708..206cca2d9b29 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -627,6 +627,7 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
struct rt6_info *rt = (struct rt6_info *)*dstp;
int hlen = LL_RESERVED_SPACE(rt->dst.dev);
int tlen = rt->dst.dev->needed_tailroom;
+ int linear = length;
if (length > rt->dst.dev->mtu) {
ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
@@ -637,8 +638,12 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
if (flags&MSG_PROBE)
goto out;
+ if (flags & MSG_ZEROCOPY &&
+ rt->dst.dev->features & NETIF_F_SG)
+ linear = min_t(int, length, MAX_HEADER);
+
skb = sock_alloc_send_skb(sk,
- length + hlen + tlen + 15,
+ linear + hlen + tlen + 15,
flags & MSG_DONTWAIT, &err);
if (!skb)
goto error;
@@ -650,7 +655,7 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
skb_dst_set(skb, &rt->dst);
*dstp = NULL;
- skb_put(skb, length);
+ skb_put(skb, linear);
skb_reset_network_header(skb);
iph = ipv6_hdr(skb);
@@ -660,10 +665,17 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
skb_set_dst_pending_confirm(skb, 1);
skb->transport_header = skb->network_header;
- err = memcpy_from_msg(iph, msg, length);
+ err = memcpy_from_msg(iph, msg, linear);
if (err)
goto error_fault;
+ if (flags & MSG_ZEROCOPY) {
+ err = skb_zerocopy_iter_alloc(skb, (void *)&msg,
+ length - linear);
+ if (err)
+ goto error_zcopy;
+ }
+
/* if egress device is enslaved to an L3 master device pass the
* skb to its handler for processing
*/
@@ -681,6 +693,8 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
out:
return 0;
+error_zcopy:
+ skb_zcopy_abort(skb);
error_fault:
err = -EFAULT;
kfree_skb(skb);
--
2.13.1.518.g3df882009-goog
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