* [PATCH net-next 1/3] net: add skb_checksum_setup
2014-01-08 13:58 [PATCH net-next 0/3] make skb_checksum_setup generally available Paul Durrant
@ 2014-01-08 13:58 ` Paul Durrant
2014-01-08 22:43 ` Eric Dumazet
2014-01-08 13:58 ` [PATCH net-next 2/3] xen-netback: use new skb_checksum_setup function Paul Durrant
2014-01-08 13:58 ` [PATCH net-next 3/3] xen-netfront: " Paul Durrant
2 siblings, 1 reply; 6+ messages in thread
From: Paul Durrant @ 2014-01-08 13:58 UTC (permalink / raw)
To: netdev, xen-devel
Cc: Paul Durrant, David Miller, Eric Dumazet, Veaceslav Falico,
Alexander Duyck, Nicolas Dichtel
This patch adds a function to set up the partial checksum offset for IP
packets (and optionally re-calculate the pseudo-header checksum) into the
core network code.
The implementation was previously private and duplicated between xen-netback
and xen-netfront, however it is not xen-specific and is potentially useful
to any network driver.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: David Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Veaceslav Falico <vfalico@redhat.com>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
---
include/linux/netdevice.h | 1 +
net/core/dev.c | 271 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 272 insertions(+)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index a2a70cc..15b1003 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2940,6 +2940,7 @@ void netdev_upper_dev_unlink(struct net_device *dev,
void *netdev_lower_dev_get_private(struct net_device *dev,
struct net_device *lower_dev);
int skb_checksum_help(struct sk_buff *skb);
+int skb_checksum_setup(struct sk_buff *skb, bool recalculate);
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path);
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
diff --git a/net/core/dev.c b/net/core/dev.c
index ce01847..cf9fc30 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -101,6 +101,7 @@
#include <net/dst.h>
#include <net/pkt_sched.h>
#include <net/checksum.h>
+#include <net/ip6_checksum.h>
#include <net/xfrm.h>
#include <linux/highmem.h>
#include <linux/init.h>
@@ -2281,6 +2282,276 @@ out:
}
EXPORT_SYMBOL(skb_checksum_help);
+static inline int skb_maybe_pull_tail(struct sk_buff *skb, unsigned int len,
+ unsigned int max)
+{
+ if (skb_headlen(skb) >= len)
+ return 0;
+
+ /* If we need to pullup then pullup to the max, so we
+ * won't need to do it again.
+ */
+ if (max > skb->len)
+ max = skb->len;
+
+ if (__pskb_pull_tail(skb, max - skb_headlen(skb)) == NULL)
+ return -ENOMEM;
+
+ if (skb_headlen(skb) < len)
+ return -EPROTO;
+
+ return 0;
+}
+
+/* This value should be large enough to cover a tagged ethernet header plus
+ * maximally sized IP and TCP or UDP headers.
+ */
+#define MAX_IP_HDR_LEN 128
+
+static int skb_checksum_setup_ip(struct sk_buff *skb, bool recalculate)
+{
+ unsigned int off;
+ bool fragment;
+ int err;
+
+ fragment = false;
+
+ err = skb_maybe_pull_tail(skb,
+ sizeof(struct iphdr),
+ MAX_IP_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ if (ip_hdr(skb)->frag_off & htons(IP_OFFSET | IP_MF))
+ fragment = true;
+
+ off = ip_hdrlen(skb);
+
+ err = -EPROTO;
+
+ if (fragment)
+ goto out;
+
+ switch (ip_hdr(skb)->protocol) {
+ case IPPROTO_TCP:
+ err = skb_maybe_pull_tail(skb,
+ off + sizeof(struct tcphdr),
+ MAX_IP_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ if (!skb_partial_csum_set(skb, off,
+ offsetof(struct tcphdr, check))) {
+ err = -EPROTO;
+ goto out;
+ }
+
+ if (recalculate)
+ tcp_hdr(skb)->check =
+ ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr,
+ skb->len - off,
+ IPPROTO_TCP, 0);
+ break;
+ case IPPROTO_UDP:
+ err = skb_maybe_pull_tail(skb,
+ off + sizeof(struct udphdr),
+ MAX_IP_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ if (!skb_partial_csum_set(skb, off,
+ offsetof(struct udphdr, check))) {
+ err = -EPROTO;
+ goto out;
+ }
+
+ if (recalculate)
+ udp_hdr(skb)->check =
+ ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr,
+ skb->len - off,
+ IPPROTO_UDP, 0);
+ break;
+ default:
+ goto out;
+ }
+
+ err = 0;
+
+out:
+ return err;
+}
+
+/* This value should be large enough to cover a tagged ethernet header plus
+ * an IPv6 header, all options, and a maximal TCP or UDP header.
+ */
+#define MAX_IPV6_HDR_LEN 256
+
+#define OPT_HDR(type, skb, off) \
+ (type *)(skb_network_header(skb) + (off))
+
+static int skb_checksum_setup_ipv6(struct sk_buff *skb, bool recalculate)
+{
+ int err;
+ u8 nexthdr;
+ unsigned int off;
+ unsigned int len;
+ bool fragment;
+ bool done;
+
+ fragment = false;
+ done = false;
+
+ off = sizeof(struct ipv6hdr);
+
+ err = skb_maybe_pull_tail(skb, off, MAX_IPV6_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ nexthdr = ipv6_hdr(skb)->nexthdr;
+
+ len = sizeof(struct ipv6hdr) + ntohs(ipv6_hdr(skb)->payload_len);
+ while (off <= len && !done) {
+ switch (nexthdr) {
+ case IPPROTO_DSTOPTS:
+ case IPPROTO_HOPOPTS:
+ case IPPROTO_ROUTING: {
+ struct ipv6_opt_hdr *hp;
+
+ err = skb_maybe_pull_tail(skb,
+ off +
+ sizeof(struct ipv6_opt_hdr),
+ MAX_IPV6_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
+ nexthdr = hp->nexthdr;
+ off += ipv6_optlen(hp);
+ break;
+ }
+ case IPPROTO_AH: {
+ struct ip_auth_hdr *hp;
+
+ err = skb_maybe_pull_tail(skb,
+ off +
+ sizeof(struct ip_auth_hdr),
+ MAX_IPV6_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ hp = OPT_HDR(struct ip_auth_hdr, skb, off);
+ nexthdr = hp->nexthdr;
+ off += ipv6_authlen(hp);
+ break;
+ }
+ case IPPROTO_FRAGMENT: {
+ struct frag_hdr *hp;
+
+ err = skb_maybe_pull_tail(skb,
+ off +
+ sizeof(struct frag_hdr),
+ MAX_IPV6_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ hp = OPT_HDR(struct frag_hdr, skb, off);
+
+ if (hp->frag_off & htons(IP6_OFFSET | IP6_MF))
+ fragment = true;
+
+ nexthdr = hp->nexthdr;
+ off += sizeof(struct frag_hdr);
+ break;
+ }
+ default:
+ done = true;
+ break;
+ }
+ }
+
+ err = -EPROTO;
+
+ if (!done || fragment)
+ goto out;
+
+ switch (nexthdr) {
+ case IPPROTO_TCP:
+ err = skb_maybe_pull_tail(skb,
+ off + sizeof(struct tcphdr),
+ MAX_IPV6_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ if (!skb_partial_csum_set(skb, off,
+ offsetof(struct tcphdr, check))) {
+ err = -EPROTO;
+ goto out;
+ }
+
+ if (recalculate)
+ tcp_hdr(skb)->check =
+ ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len - off,
+ IPPROTO_TCP, 0);
+ break;
+ case IPPROTO_UDP:
+ err = skb_maybe_pull_tail(skb,
+ off + sizeof(struct udphdr),
+ MAX_IPV6_HDR_LEN);
+ if (err < 0)
+ goto out;
+
+ if (!skb_partial_csum_set(skb, off,
+ offsetof(struct udphdr, check))) {
+ err = -EPROTO;
+ goto out;
+ }
+
+ if (recalculate)
+ udp_hdr(skb)->check =
+ ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len - off,
+ IPPROTO_UDP, 0);
+ break;
+ default:
+ goto out;
+ }
+
+ err = 0;
+
+out:
+ return err;
+}
+
+/* Set up partial checksum offset and optionally recalculate pseudo header
+ * checksum.
+ */
+int skb_checksum_setup(struct sk_buff *skb, bool recalculate)
+{
+ int err;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ err = skb_checksum_setup_ip(skb, recalculate);
+ break;
+
+ case htons(ETH_P_IPV6):
+ err = skb_checksum_setup_ipv6(skb, recalculate);
+ break;
+
+ default:
+ err = -EPROTO;
+ break;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(skb_checksum_setup);
+
__be16 skb_network_protocol(struct sk_buff *skb)
{
__be16 type = skb->protocol;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH net-next 1/3] net: add skb_checksum_setup
2014-01-08 13:58 ` [PATCH net-next 1/3] net: add skb_checksum_setup Paul Durrant
@ 2014-01-08 22:43 ` Eric Dumazet
2014-01-09 9:22 ` Paul Durrant
0 siblings, 1 reply; 6+ messages in thread
From: Eric Dumazet @ 2014-01-08 22:43 UTC (permalink / raw)
To: Paul Durrant
Cc: netdev, xen-devel, David Miller, Eric Dumazet, Veaceslav Falico,
Alexander Duyck, Nicolas Dichtel
On Wed, 2014-01-08 at 13:58 +0000, Paul Durrant wrote:
> This patch adds a function to set up the partial checksum offset for IP
> packets (and optionally re-calculate the pseudo-header checksum) into the
> core network code.
> The implementation was previously private and duplicated between xen-netback
> and xen-netfront, however it is not xen-specific and is potentially useful
> to any network driver.
>
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> Cc: David Miller <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Veaceslav Falico <vfalico@redhat.com>
> Cc: Alexander Duyck <alexander.h.duyck@intel.com>
> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
> ---
> include/linux/netdevice.h | 1 +
> net/core/dev.c | 271 +++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 272 insertions(+)
Is there any reason to put this in net/core/dev.c instead of
net/core/skbuff.c ?
Also, no inline should be used in a .c file
( skb_maybe_pull_tail )
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: [PATCH net-next 1/3] net: add skb_checksum_setup
2014-01-08 22:43 ` Eric Dumazet
@ 2014-01-09 9:22 ` Paul Durrant
0 siblings, 0 replies; 6+ messages in thread
From: Paul Durrant @ 2014-01-09 9:22 UTC (permalink / raw)
To: Eric Dumazet
Cc: netdev@vger.kernel.org, xen-devel@lists.xen.org, David Miller,
Eric Dumazet, Veaceslav Falico, Alexander Duyck, Nicolas Dichtel
> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@gmail.com]
> Sent: 08 January 2014 22:43
> To: Paul Durrant
> Cc: netdev@vger.kernel.org; xen-devel@lists.xen.org; David Miller; Eric
> Dumazet; Veaceslav Falico; Alexander Duyck; Nicolas Dichtel
> Subject: Re: [PATCH net-next 1/3] net: add skb_checksum_setup
>
> On Wed, 2014-01-08 at 13:58 +0000, Paul Durrant wrote:
> > This patch adds a function to set up the partial checksum offset for IP
> > packets (and optionally re-calculate the pseudo-header checksum) into the
> > core network code.
> > The implementation was previously private and duplicated between xen-
> netback
> > and xen-netfront, however it is not xen-specific and is potentially useful
> > to any network driver.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> > Cc: David Miller <davem@davemloft.net>
> > Cc: Eric Dumazet <edumazet@google.com>
> > Cc: Veaceslav Falico <vfalico@redhat.com>
> > Cc: Alexander Duyck <alexander.h.duyck@intel.com>
> > Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
> > ---
> > include/linux/netdevice.h | 1 +
> > net/core/dev.c | 271
> +++++++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 272 insertions(+)
>
> Is there any reason to put this in net/core/dev.c instead of
> net/core/skbuff.c ?
>
No, no reason. I just wasn't sure which was the better place. I'll put it in skbuff.c if that is more appropriate.
>
> Also, no inline should be used in a .c file
>
> ( skb_maybe_pull_tail )
>
Ok. I'll fix that.
Thanks,
Paul
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH net-next 2/3] xen-netback: use new skb_checksum_setup function
2014-01-08 13:58 [PATCH net-next 0/3] make skb_checksum_setup generally available Paul Durrant
2014-01-08 13:58 ` [PATCH net-next 1/3] net: add skb_checksum_setup Paul Durrant
@ 2014-01-08 13:58 ` Paul Durrant
2014-01-08 13:58 ` [PATCH net-next 3/3] xen-netfront: " Paul Durrant
2 siblings, 0 replies; 6+ messages in thread
From: Paul Durrant @ 2014-01-08 13:58 UTC (permalink / raw)
To: netdev, xen-devel; +Cc: Paul Durrant, Ian Campbell, Wei Liu
Use skb_checksum_setup to set up partial checksum offsets rather
then a private implementation.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
---
drivers/net/xen-netback/netback.c | 260 +------------------------------------
1 file changed, 3 insertions(+), 257 deletions(-)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 4f81ac0..2605405 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -39,7 +39,6 @@
#include <linux/udp.h>
#include <net/tcp.h>
-#include <net/ip6_checksum.h>
#include <xen/xen.h>
#include <xen/events.h>
@@ -1048,257 +1047,9 @@ static int xenvif_set_skb_gso(struct xenvif *vif,
return 0;
}
-static inline int maybe_pull_tail(struct sk_buff *skb, unsigned int len,
- unsigned int max)
-{
- if (skb_headlen(skb) >= len)
- return 0;
-
- /* If we need to pullup then pullup to the max, so we
- * won't need to do it again.
- */
- if (max > skb->len)
- max = skb->len;
-
- if (__pskb_pull_tail(skb, max - skb_headlen(skb)) == NULL)
- return -ENOMEM;
-
- if (skb_headlen(skb) < len)
- return -EPROTO;
-
- return 0;
-}
-
-/* This value should be large enough to cover a tagged ethernet header plus
- * maximally sized IP and TCP or UDP headers.
- */
-#define MAX_IP_HDR_LEN 128
-
-static int checksum_setup_ip(struct xenvif *vif, struct sk_buff *skb,
- int recalculate_partial_csum)
-{
- unsigned int off;
- bool fragment;
- int err;
-
- fragment = false;
-
- err = maybe_pull_tail(skb,
- sizeof(struct iphdr),
- MAX_IP_HDR_LEN);
- if (err < 0)
- goto out;
-
- if (ip_hdr(skb)->frag_off & htons(IP_OFFSET | IP_MF))
- fragment = true;
-
- off = ip_hdrlen(skb);
-
- err = -EPROTO;
-
- if (fragment)
- goto out;
-
- switch (ip_hdr(skb)->protocol) {
- case IPPROTO_TCP:
- err = maybe_pull_tail(skb,
- off + sizeof(struct tcphdr),
- MAX_IP_HDR_LEN);
- if (err < 0)
- goto out;
-
- if (!skb_partial_csum_set(skb, off,
- offsetof(struct tcphdr, check))) {
- err = -EPROTO;
- goto out;
- }
-
- if (recalculate_partial_csum)
- tcp_hdr(skb)->check =
- ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
- ip_hdr(skb)->daddr,
- skb->len - off,
- IPPROTO_TCP, 0);
- break;
- case IPPROTO_UDP:
- err = maybe_pull_tail(skb,
- off + sizeof(struct udphdr),
- MAX_IP_HDR_LEN);
- if (err < 0)
- goto out;
-
- if (!skb_partial_csum_set(skb, off,
- offsetof(struct udphdr, check))) {
- err = -EPROTO;
- goto out;
- }
-
- if (recalculate_partial_csum)
- udp_hdr(skb)->check =
- ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
- ip_hdr(skb)->daddr,
- skb->len - off,
- IPPROTO_UDP, 0);
- break;
- default:
- goto out;
- }
-
- err = 0;
-
-out:
- return err;
-}
-
-/* This value should be large enough to cover a tagged ethernet header plus
- * an IPv6 header, all options, and a maximal TCP or UDP header.
- */
-#define MAX_IPV6_HDR_LEN 256
-
-#define OPT_HDR(type, skb, off) \
- (type *)(skb_network_header(skb) + (off))
-
-static int checksum_setup_ipv6(struct xenvif *vif, struct sk_buff *skb,
- int recalculate_partial_csum)
-{
- int err;
- u8 nexthdr;
- unsigned int off;
- unsigned int len;
- bool fragment;
- bool done;
-
- fragment = false;
- done = false;
-
- off = sizeof(struct ipv6hdr);
-
- err = maybe_pull_tail(skb, off, MAX_IPV6_HDR_LEN);
- if (err < 0)
- goto out;
-
- nexthdr = ipv6_hdr(skb)->nexthdr;
-
- len = sizeof(struct ipv6hdr) + ntohs(ipv6_hdr(skb)->payload_len);
- while (off <= len && !done) {
- switch (nexthdr) {
- case IPPROTO_DSTOPTS:
- case IPPROTO_HOPOPTS:
- case IPPROTO_ROUTING: {
- struct ipv6_opt_hdr *hp;
-
- err = maybe_pull_tail(skb,
- off +
- sizeof(struct ipv6_opt_hdr),
- MAX_IPV6_HDR_LEN);
- if (err < 0)
- goto out;
-
- hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
- nexthdr = hp->nexthdr;
- off += ipv6_optlen(hp);
- break;
- }
- case IPPROTO_AH: {
- struct ip_auth_hdr *hp;
-
- err = maybe_pull_tail(skb,
- off +
- sizeof(struct ip_auth_hdr),
- MAX_IPV6_HDR_LEN);
- if (err < 0)
- goto out;
-
- hp = OPT_HDR(struct ip_auth_hdr, skb, off);
- nexthdr = hp->nexthdr;
- off += ipv6_authlen(hp);
- break;
- }
- case IPPROTO_FRAGMENT: {
- struct frag_hdr *hp;
-
- err = maybe_pull_tail(skb,
- off +
- sizeof(struct frag_hdr),
- MAX_IPV6_HDR_LEN);
- if (err < 0)
- goto out;
-
- hp = OPT_HDR(struct frag_hdr, skb, off);
-
- if (hp->frag_off & htons(IP6_OFFSET | IP6_MF))
- fragment = true;
-
- nexthdr = hp->nexthdr;
- off += sizeof(struct frag_hdr);
- break;
- }
- default:
- done = true;
- break;
- }
- }
-
- err = -EPROTO;
-
- if (!done || fragment)
- goto out;
-
- switch (nexthdr) {
- case IPPROTO_TCP:
- err = maybe_pull_tail(skb,
- off + sizeof(struct tcphdr),
- MAX_IPV6_HDR_LEN);
- if (err < 0)
- goto out;
-
- if (!skb_partial_csum_set(skb, off,
- offsetof(struct tcphdr, check))) {
- err = -EPROTO;
- goto out;
- }
-
- if (recalculate_partial_csum)
- tcp_hdr(skb)->check =
- ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
- &ipv6_hdr(skb)->daddr,
- skb->len - off,
- IPPROTO_TCP, 0);
- break;
- case IPPROTO_UDP:
- err = maybe_pull_tail(skb,
- off + sizeof(struct udphdr),
- MAX_IPV6_HDR_LEN);
- if (err < 0)
- goto out;
-
- if (!skb_partial_csum_set(skb, off,
- offsetof(struct udphdr, check))) {
- err = -EPROTO;
- goto out;
- }
-
- if (recalculate_partial_csum)
- udp_hdr(skb)->check =
- ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
- &ipv6_hdr(skb)->daddr,
- skb->len - off,
- IPPROTO_UDP, 0);
- break;
- default:
- goto out;
- }
-
- err = 0;
-
-out:
- return err;
-}
-
static int checksum_setup(struct xenvif *vif, struct sk_buff *skb)
{
- int err = -EPROTO;
- int recalculate_partial_csum = 0;
+ bool recalculate_partial_csum = false;
/* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
* peers can fail to set NETRXF_csum_blank when sending a GSO
@@ -1308,19 +1059,14 @@ static int checksum_setup(struct xenvif *vif, struct sk_buff *skb)
if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
vif->rx_gso_checksum_fixup++;
skb->ip_summed = CHECKSUM_PARTIAL;
- recalculate_partial_csum = 1;
+ recalculate_partial_csum = true;
}
/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
if (skb->ip_summed != CHECKSUM_PARTIAL)
return 0;
- if (skb->protocol == htons(ETH_P_IP))
- err = checksum_setup_ip(vif, skb, recalculate_partial_csum);
- else if (skb->protocol == htons(ETH_P_IPV6))
- err = checksum_setup_ipv6(vif, skb, recalculate_partial_csum);
-
- return err;
+ return skb_checksum_setup(skb, recalculate_partial_csum);
}
static bool tx_credit_exceeded(struct xenvif *vif, unsigned size)
--
1.7.10.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH net-next 3/3] xen-netfront: use new skb_checksum_setup function
2014-01-08 13:58 [PATCH net-next 0/3] make skb_checksum_setup generally available Paul Durrant
2014-01-08 13:58 ` [PATCH net-next 1/3] net: add skb_checksum_setup Paul Durrant
2014-01-08 13:58 ` [PATCH net-next 2/3] xen-netback: use new skb_checksum_setup function Paul Durrant
@ 2014-01-08 13:58 ` Paul Durrant
2 siblings, 0 replies; 6+ messages in thread
From: Paul Durrant @ 2014-01-08 13:58 UTC (permalink / raw)
To: netdev, xen-devel
Cc: Paul Durrant, Konrad Rzeszutek Wilk, Boris Ostrovsky,
David Vrabel
Use skb_checksum_setup to set up partial checksum offsets rather
then a private implementation.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
---
drivers/net/xen-netfront.c | 48 +++-----------------------------------------
1 file changed, 3 insertions(+), 45 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index e59acb1..c41537b 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -859,9 +859,7 @@ static RING_IDX xennet_fill_frags(struct netfront_info *np,
static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
{
- struct iphdr *iph;
- int err = -EPROTO;
- int recalculate_partial_csum = 0;
+ bool recalculate_partial_csum = false;
/*
* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
@@ -873,54 +871,14 @@ static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
struct netfront_info *np = netdev_priv(dev);
np->rx_gso_checksum_fixup++;
skb->ip_summed = CHECKSUM_PARTIAL;
- recalculate_partial_csum = 1;
+ recalculate_partial_csum = true;
}
/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
if (skb->ip_summed != CHECKSUM_PARTIAL)
return 0;
- if (skb->protocol != htons(ETH_P_IP))
- goto out;
-
- iph = (void *)skb->data;
-
- switch (iph->protocol) {
- case IPPROTO_TCP:
- if (!skb_partial_csum_set(skb, 4 * iph->ihl,
- offsetof(struct tcphdr, check)))
- goto out;
-
- if (recalculate_partial_csum) {
- struct tcphdr *tcph = tcp_hdr(skb);
- tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
- skb->len - iph->ihl*4,
- IPPROTO_TCP, 0);
- }
- break;
- case IPPROTO_UDP:
- if (!skb_partial_csum_set(skb, 4 * iph->ihl,
- offsetof(struct udphdr, check)))
- goto out;
-
- if (recalculate_partial_csum) {
- struct udphdr *udph = udp_hdr(skb);
- udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
- skb->len - iph->ihl*4,
- IPPROTO_UDP, 0);
- }
- break;
- default:
- if (net_ratelimit())
- pr_err("Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n",
- iph->protocol);
- goto out;
- }
-
- err = 0;
-
-out:
- return err;
+ return skb_checksum_setup(skb, recalculate_partial_csum);
}
static int handle_incoming_queue(struct net_device *dev,
--
1.7.10.4
^ permalink raw reply related [flat|nested] 6+ messages in thread