* [PATCH net-next v2 0/3] make skb_checksum_setup generally available
@ 2014-01-09 10:02 Paul Durrant
2014-01-09 10:02 ` [PATCH net-next v2 1/3] net: add skb_checksum_setup Paul Durrant
` (3 more replies)
0 siblings, 4 replies; 10+ messages in thread
From: Paul Durrant @ 2014-01-09 10:02 UTC (permalink / raw)
To: netdev, xen-devel
Both xen-netfront and xen-netback need to be able to set up the partial
checksum offset of an skb and may also need to recalculate the pseudo-
header checksum in the process. This functionality is currently private
and duplicated between the two drivers.
Patch #1 of this series moves the implementation into the core network code
as there is nothing xen-specific about it and it is potentially useful to
any network driver.
Patch #2 removes the private implementation from netback.
Patch #3 removes the private implementation from netfront.
v2:
- Put skb_checksum_setup in skbuff.c rather than dev.c
- remove inline
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH net-next v2 1/3] net: add skb_checksum_setup
2014-01-09 10:02 [PATCH net-next v2 0/3] make skb_checksum_setup generally available Paul Durrant
@ 2014-01-09 10:02 ` Paul Durrant
2014-01-13 11:26 ` Paul Durrant
2014-01-09 10:02 ` [PATCH net-next v2 2/3] xen-netback: use new skb_checksum_setup function Paul Durrant
` (2 subsequent siblings)
3 siblings, 1 reply; 10+ messages in thread
From: Paul Durrant @ 2014-01-09 10:02 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/skbuff.h | 2 +
net/core/skbuff.c | 273 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 275 insertions(+)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d97f2d0..48b7605 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2893,6 +2893,8 @@ static inline void skb_checksum_none_assert(const struct sk_buff *skb)
bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
+int skb_checksum_setup(struct sk_buff *skb, bool recalculate);
+
u32 __skb_get_poff(const struct sk_buff *skb);
/**
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 1d641e7..15057d2 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -65,6 +65,7 @@
#include <net/dst.h>
#include <net/sock.h>
#include <net/checksum.h>
+#include <net/ip6_checksum.h>
#include <net/xfrm.h>
#include <asm/uaccess.h>
@@ -3549,6 +3550,278 @@ bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
}
EXPORT_SYMBOL_GPL(skb_partial_csum_set);
+static 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;
+}
+
+/**
+ * skb_checksum_setup - set up partial checksum offset
+ * @skb: the skb to set up
+ * @recalculate: if true the pseudo-header checksum will be recalculated
+ */
+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);
+
void __skb_warn_lro_forwarding(const struct sk_buff *skb)
{
net_warn_ratelimited("%s: received packets cannot be forwarded while LRO is enabled\n",
--
1.7.10.4
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH net-next v2 2/3] xen-netback: use new skb_checksum_setup function
2014-01-09 10:02 [PATCH net-next v2 0/3] make skb_checksum_setup generally available Paul Durrant
2014-01-09 10:02 ` [PATCH net-next v2 1/3] net: add skb_checksum_setup Paul Durrant
@ 2014-01-09 10:02 ` Paul Durrant
2014-01-09 12:26 ` Wei Liu
2014-01-09 10:02 ` [PATCH net-next v2 3/3] xen-netfront: " Paul Durrant
2014-01-14 22:24 ` [PATCH net-next v2 0/3] make skb_checksum_setup generally available David Miller
3 siblings, 1 reply; 10+ messages in thread
From: Paul Durrant @ 2014-01-09 10:02 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] 10+ messages in thread
* [PATCH net-next v2 3/3] xen-netfront: use new skb_checksum_setup function
2014-01-09 10:02 [PATCH net-next v2 0/3] make skb_checksum_setup generally available Paul Durrant
2014-01-09 10:02 ` [PATCH net-next v2 1/3] net: add skb_checksum_setup Paul Durrant
2014-01-09 10:02 ` [PATCH net-next v2 2/3] xen-netback: use new skb_checksum_setup function Paul Durrant
@ 2014-01-09 10:02 ` Paul Durrant
2014-01-13 19:27 ` David Miller
2014-01-14 22:24 ` [PATCH net-next v2 0/3] make skb_checksum_setup generally available David Miller
3 siblings, 1 reply; 10+ messages in thread
From: Paul Durrant @ 2014-01-09 10:02 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] 10+ messages in thread
* Re: [PATCH net-next v2 2/3] xen-netback: use new skb_checksum_setup function
2014-01-09 10:02 ` [PATCH net-next v2 2/3] xen-netback: use new skb_checksum_setup function Paul Durrant
@ 2014-01-09 12:26 ` Wei Liu
0 siblings, 0 replies; 10+ messages in thread
From: Wei Liu @ 2014-01-09 12:26 UTC (permalink / raw)
To: Paul Durrant; +Cc: netdev, xen-devel, Ian Campbell, Wei Liu
On Thu, Jan 09, 2014 at 10:02:47AM +0000, Paul Durrant wrote:
> 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>
If your change to core driver goes in then:
Acked-by: Wei Liu <wei.liu2@citrix.com>
Thanks
Wei.
^ permalink raw reply [flat|nested] 10+ messages in thread
* RE: [PATCH net-next v2 1/3] net: add skb_checksum_setup
2014-01-09 10:02 ` [PATCH net-next v2 1/3] net: add skb_checksum_setup Paul Durrant
@ 2014-01-13 11:26 ` Paul Durrant
2014-01-13 13:40 ` Nicolas Dichtel
0 siblings, 1 reply; 10+ messages in thread
From: Paul Durrant @ 2014-01-13 11:26 UTC (permalink / raw)
To: Paul Durrant, netdev@vger.kernel.org, xen-devel@lists.xen.org
Cc: David Miller, Eric Dumazet, Veaceslav Falico, Alexander Duyck,
Nicolas Dichtel
> -----Original Message-----
> From: Paul Durrant [mailto:paul.durrant@citrix.com]
> Sent: 09 January 2014 10:03
> To: netdev@vger.kernel.org; xen-devel@lists.xen.org
> Cc: Paul Durrant; David Miller; Eric Dumazet; Veaceslav Falico; Alexander
> Duyck; Nicolas Dichtel
> Subject: [PATCH net-next v2 1/3] net: add skb_checksum_setup
>
> 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>
Ping?
Paul
> ---
> include/linux/skbuff.h | 2 +
> net/core/skbuff.c | 273
> ++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 275 insertions(+)
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index d97f2d0..48b7605 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -2893,6 +2893,8 @@ static inline void skb_checksum_none_assert(const
> struct sk_buff *skb)
>
> bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
>
> +int skb_checksum_setup(struct sk_buff *skb, bool recalculate);
> +
> u32 __skb_get_poff(const struct sk_buff *skb);
>
> /**
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 1d641e7..15057d2 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -65,6 +65,7 @@
> #include <net/dst.h>
> #include <net/sock.h>
> #include <net/checksum.h>
> +#include <net/ip6_checksum.h>
> #include <net/xfrm.h>
>
> #include <asm/uaccess.h>
> @@ -3549,6 +3550,278 @@ bool skb_partial_csum_set(struct sk_buff *skb,
> u16 start, u16 off)
> }
> EXPORT_SYMBOL_GPL(skb_partial_csum_set);
>
> +static 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;
> +}
> +
> +/**
> + * skb_checksum_setup - set up partial checksum offset
> + * @skb: the skb to set up
> + * @recalculate: if true the pseudo-header checksum will be recalculated
> + */
> +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);
> +
> void __skb_warn_lro_forwarding(const struct sk_buff *skb)
> {
> net_warn_ratelimited("%s: received packets cannot be forwarded
> while LRO is enabled\n",
> --
> 1.7.10.4
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net-next v2 1/3] net: add skb_checksum_setup
2014-01-13 11:26 ` Paul Durrant
@ 2014-01-13 13:40 ` Nicolas Dichtel
0 siblings, 0 replies; 10+ messages in thread
From: Nicolas Dichtel @ 2014-01-13 13:40 UTC (permalink / raw)
To: Paul Durrant, netdev@vger.kernel.org, xen-devel@lists.xen.org
Cc: David Miller, Eric Dumazet, Veaceslav Falico, Alexander Duyck
Le 13/01/2014 12:26, Paul Durrant a écrit :
>> -----Original Message-----
>> From: Paul Durrant [mailto:paul.durrant@citrix.com]
>> Sent: 09 January 2014 10:03
>> To: netdev@vger.kernel.org; xen-devel@lists.xen.org
>> Cc: Paul Durrant; David Miller; Eric Dumazet; Veaceslav Falico; Alexander
>> Duyck; Nicolas Dichtel
>> Subject: [PATCH net-next v2 1/3] net: add skb_checksum_setup
>>
>> 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>
>
> Ping?
Your patch is under review by David (see
http://patchwork.ozlabs.org/patch/308539/), please be patient ;-)
Nicolas
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net-next v2 3/3] xen-netfront: use new skb_checksum_setup function
2014-01-09 10:02 ` [PATCH net-next v2 3/3] xen-netfront: " Paul Durrant
@ 2014-01-13 19:27 ` David Miller
2014-01-14 9:33 ` [Xen-devel] " Ian Campbell
0 siblings, 1 reply; 10+ messages in thread
From: David Miller @ 2014-01-13 19:27 UTC (permalink / raw)
To: paul.durrant
Cc: netdev, xen-devel, konrad.wilk, boris.ostrovsky, david.vrabel
From: Paul Durrant <paul.durrant@citrix.com>
Date: Thu, 9 Jan 2014 10:02:48 +0000
> Use skb_checksum_setup to set up partial checksum offsets rather
> then a private implementation.
>
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
This patch really needs review by a netfront expert before I can apply
this series.
Thanks.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Xen-devel] [PATCH net-next v2 3/3] xen-netfront: use new skb_checksum_setup function
2014-01-13 19:27 ` David Miller
@ 2014-01-14 9:33 ` Ian Campbell
0 siblings, 0 replies; 10+ messages in thread
From: Ian Campbell @ 2014-01-14 9:33 UTC (permalink / raw)
To: David Miller
Cc: paul.durrant, netdev, boris.ostrovsky, david.vrabel, xen-devel
On Mon, 2014-01-13 at 11:27 -0800, David Miller wrote:
> From: Paul Durrant <paul.durrant@citrix.com>
> Date: Thu, 9 Jan 2014 10:02:48 +0000
>
> > Use skb_checksum_setup to set up partial checksum offsets rather
> > then a private implementation.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
>
> This patch really needs review by a netfront expert before I can apply
> this series.
I think in combination with 1/3 it is basically code motion. So although
I'm not not netfront maintainer:
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Ian.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net-next v2 0/3] make skb_checksum_setup generally available
2014-01-09 10:02 [PATCH net-next v2 0/3] make skb_checksum_setup generally available Paul Durrant
` (2 preceding siblings ...)
2014-01-09 10:02 ` [PATCH net-next v2 3/3] xen-netfront: " Paul Durrant
@ 2014-01-14 22:24 ` David Miller
3 siblings, 0 replies; 10+ messages in thread
From: David Miller @ 2014-01-14 22:24 UTC (permalink / raw)
To: paul.durrant; +Cc: netdev, xen-devel
From: Paul Durrant <paul.durrant@citrix.com>
Date: Thu, 9 Jan 2014 10:02:45 +0000
> Both xen-netfront and xen-netback need to be able to set up the partial
> checksum offset of an skb and may also need to recalculate the pseudo-
> header checksum in the process. This functionality is currently private
> and duplicated between the two drivers.
>
> Patch #1 of this series moves the implementation into the core network code
> as there is nothing xen-specific about it and it is potentially useful to
> any network driver.
> Patch #2 removes the private implementation from netback.
> Patch #3 removes the private implementation from netfront.
>
> v2:
> - Put skb_checksum_setup in skbuff.c rather than dev.c
> - remove inline
Series applied, thanks.
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2014-01-14 22:24 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-01-09 10:02 [PATCH net-next v2 0/3] make skb_checksum_setup generally available Paul Durrant
2014-01-09 10:02 ` [PATCH net-next v2 1/3] net: add skb_checksum_setup Paul Durrant
2014-01-13 11:26 ` Paul Durrant
2014-01-13 13:40 ` Nicolas Dichtel
2014-01-09 10:02 ` [PATCH net-next v2 2/3] xen-netback: use new skb_checksum_setup function Paul Durrant
2014-01-09 12:26 ` Wei Liu
2014-01-09 10:02 ` [PATCH net-next v2 3/3] xen-netfront: " Paul Durrant
2014-01-13 19:27 ` David Miller
2014-01-14 9:33 ` [Xen-devel] " Ian Campbell
2014-01-14 22:24 ` [PATCH net-next v2 0/3] make skb_checksum_setup generally available David Miller
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