| Message ID | 1590471344-74460-1-git-send-email-hzhou@ovn.org |
|---|---|
| State | Accepted |
| Delegated to: | Ilya Maximets |
| Headers | show |
| Series | [ovs-dev,v2] datapath: Add hash info to upcall. | expand |
Bleep bloop. Greetings Han Zhou, I am a robot and I have tried out your patch. Thanks for your contribution. I encountered some error that I wasn't expecting. See the details below. checkpatch: ERROR: Author Tonghao Zhang <xiangxia.m.yue@gmail.com> needs to sign off. WARNING: Unexpected sign-offs from developers who are not authors or co-authors or committers: Han Zhou <hzhou@ovn.org> Lines checked: 244, Warnings: 1, Errors: 1 Please check this out. If you feel there has been an error, please email aconole@redhat.com Thanks, 0-day Robot
Thanks Han for backporting it for lower kernels. I tested this patch with some running workloads with old 3.13* kernels (ovs 2.11*) and it works fine. In addition I am also considering the discussion [1], and for ecmp workloads I see all packets are hitting the different bucket instead of the same bucket (using ssh with single connection). Not a blocker as will plan to upgrade these nodes with 3.13* to newer 4*+ kernels moving further as it's tough to leverage all ovs features for old kernels. Tested-by: Aliasgar Ginwala <aginwala@ebay.com> [1] - https://mail.openvswitch.org/pipermail/ovs-discuss/2020-April/049896.html On Mon, May 25, 2020 at 11:28 PM Han Zhou <hzhou@ovn.org> wrote: > This patch backports below upstream patches, and add __skb_set_hash > to compat for older kernels. > > commit b5ab1f1be6180a2e975eede18731804b5164a05d > Author: Jakub Kicinski <kuba@kernel.org> > Date: Mon Mar 2 21:05:18 2020 -0800 > > openvswitch: add missing attribute validation for hash > > Add missing attribute validation for OVS_PACKET_ATTR_HASH > to the netlink policy. > > Fixes: bd1903b7c459 ("net: openvswitch: add hash info to upcall") > Signed-off-by: Jakub Kicinski <kuba@kernel.org> > Reviewed-by: Greg Rose <gvrose8192@gmail.com> > Signed-off-by: David S. Miller <davem@davemloft.net> > > commit bd1903b7c4596ba6f7677d0dfefd05ba5876707d > Author: Tonghao Zhang <xiangxia.m.yue@gmail.com> > Date: Wed Nov 13 23:04:49 2019 +0800 > > net: openvswitch: add hash info to upcall > > When using the kernel datapath, the upcall don't > include skb hash info relatived. That will introduce > some problem, because the hash of skb is important > in kernel stack. For example, VXLAN module uses > it to select UDP src port. The tx queue selection > may also use the hash in stack. > > Hash is computed in different ways. Hash is random > for a TCP socket, and hash may be computed in hardware, > or software stack. Recalculation hash is not easy. > > Hash of TCP socket is computed: > tcp_v4_connect > -> sk_set_txhash (is random) > > __tcp_transmit_skb > -> skb_set_hash_from_sk > > There will be one upcall, without information of skb > hash, to ovs-vswitchd, for the first packet of a TCP > session. The rest packets will be processed in Open vSwitch > modules, hash kept. If this tcp session is forward to > VXLAN module, then the UDP src port of first tcp packet > is different from rest packets. > > TCP packets may come from the host or dockers, to Open vSwitch. > To fix it, we store the hash info to upcall, and restore hash > when packets sent back. > > +---------------+ +-------------------------+ > | Docker/VMs | | ovs-vswitchd | > +----+----------+ +-+--------------------+--+ > | ^ | > | | | > | | upcall v restore packet hash > (not recalculate) > | +-+--------------------+--+ > | tap netdev | | vxlan module > +---------------> +--> Open vSwitch ko +--> > or internal type | | > +-------------------------+ > > Reported-at: > https://mail.openvswitch.org/pipermail/ovs-dev/2019-October/364062.html > Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> > Acked-by: Pravin B Shelar <pshelar@ovn.org> > Signed-off-by: David S. Miller <davem@davemloft.net> > > Acked-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> > Signed-off-by: Han Zhou <hzhou@ovn.org> > --- > v1->v2: Fix build on kernel 3.16 > > acinclude.m4 | 4 ++++ > datapath/datapath.c | 33 > +++++++++++++++++++++++++++- > datapath/datapath.h | 12 ++++++++++ > datapath/linux/compat/include/linux/skbuff.h | 31 > ++++++++++++++++++++++++++ > 4 files changed, 79 insertions(+), 1 deletion(-) > > diff --git a/acinclude.m4 b/acinclude.m4 > index dabbffd..6bb7983 100644 > --- a/acinclude.m4 > +++ b/acinclude.m4 > @@ -1101,6 +1101,10 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [ > OVS_FIND_OP_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h], > [validate], [extack], > > [OVS_DEFINE([HAVE_RTNLOP_VALIDATE_WITH_EXTACK])]) > + OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], > + [__skb_set_hash]) > + OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [sw_hash]) > + OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash_raw]) > > if cmp -s datapath/linux/kcompat.h.new \ > datapath/linux/kcompat.h >/dev/null 2>&1; then > diff --git a/datapath/datapath.c b/datapath/datapath.c > index a7af784..05c1e42 100644 > --- a/datapath/datapath.c > +++ b/datapath/datapath.c > @@ -371,7 +371,8 @@ static size_t upcall_msg_size(const struct > dp_upcall_info *upcall_info, > size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) > + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ > + nla_total_size(ovs_key_attr_size()) /* > OVS_PACKET_ATTR_KEY */ > - + nla_total_size(sizeof(unsigned int)); /* > OVS_PACKET_ATTR_LEN */ > + + nla_total_size(sizeof(unsigned int)) /* > OVS_PACKET_ATTR_LEN */ > + + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ > > /* OVS_PACKET_ATTR_USERDATA */ > if (upcall_info->userdata) > @@ -414,6 +415,7 @@ static int queue_userspace_packet(struct datapath *dp, > struct sk_buff *skb, > size_t len; > unsigned int hlen; > int err, dp_ifindex; > + u64 hash; > > dp_ifindex = get_dpifindex(dp); > if (!dp_ifindex) > @@ -523,6 +525,25 @@ static int queue_userspace_packet(struct datapath > *dp, struct sk_buff *skb, > pad_packet(dp, user_skb); > } > > + /* Add OVS_PACKET_ATTR_HASH */ > + hash = skb_get_hash_raw(skb); > +#ifdef HAVE_SW_HASH > + if (skb->sw_hash) > + hash |= OVS_PACKET_HASH_SW_BIT; > +#endif > + > +#ifdef HAVE_L4_RXHASH > + if (skb->l4_rxhash) > +#else > + if (skb->l4_hash) > +#endif > + hash |= OVS_PACKET_HASH_L4_BIT; > + > + if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { > + err = -ENOBUFS; > + goto out; > + } > + > /* Only reserve room for attribute header, packet data is added > * in skb_zerocopy() > */ > @@ -563,6 +584,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, > struct genl_info *info) > struct datapath *dp; > struct vport *input_vport; > u16 mru = 0; > + u64 hash; > int len; > int err; > bool log = !a[OVS_PACKET_ATTR_PROBE]; > @@ -588,6 +610,14 @@ static int ovs_packet_cmd_execute(struct sk_buff > *skb, struct genl_info *info) > } > OVS_CB(packet)->mru = mru; > > + if (a[OVS_PACKET_ATTR_HASH]) { > + hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); > + > + __skb_set_hash(packet, hash & 0xFFFFFFFFULL, > + !!(hash & OVS_PACKET_HASH_SW_BIT), > + !!(hash & OVS_PACKET_HASH_L4_BIT)); > + } > + > /* Build an sw_flow for sending this packet. */ > flow = ovs_flow_alloc(); > err = PTR_ERR(flow); > @@ -649,6 +679,7 @@ static const struct nla_policy > packet_policy[OVS_PACKET_ATTR_MAX + 1] = { > [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, > [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, > [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, > + [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, > }; > > static struct genl_ops dp_packet_genl_ops[] = { > diff --git a/datapath/datapath.h b/datapath/datapath.h > index 3bffa1d..f99db1f 100644 > --- a/datapath/datapath.h > +++ b/datapath/datapath.h > @@ -159,6 +159,18 @@ struct ovs_net { > #endif > }; > > +/** > + * enum ovs_pkt_hash_types - hash info to include with a packet > + * to send to userspace. > + * @OVS_PACKET_HASH_SW_BIT: indicates hash was computed in software stack. > + * @OVS_PACKET_HASH_L4_BIT: indicates hash is a canonical 4-tuple hash > + * over transport ports. > + */ > +enum ovs_pkt_hash_types { > + OVS_PACKET_HASH_SW_BIT = (1ULL << 32), > + OVS_PACKET_HASH_L4_BIT = (1ULL << 33), > +}; > + > extern unsigned int ovs_net_id; > void ovs_lock(void); > void ovs_unlock(void); > diff --git a/datapath/linux/compat/include/linux/skbuff.h > b/datapath/linux/compat/include/linux/skbuff.h > index 6397289..6d248b3 100644 > --- a/datapath/linux/compat/include/linux/skbuff.h > +++ b/datapath/linux/compat/include/linux/skbuff.h > @@ -456,4 +456,35 @@ static inline void skb_set_inner_ipproto(struct > sk_buff *skb, > #define nf_reset_ct nf_reset > #endif > > +#ifndef HAVE___SKB_SET_HASH > +static inline void > +__skb_set_hash(struct sk_buff *skb, __u32 hash, bool is_sw, bool is_l4) > +{ > +#ifdef HAVE_RXHASH > + skb->rxhash = hash; > +#else > + skb->hash = hash; > +#endif > +#if defined(HAVE_L4_RXHASH) > + skb->l4_rxhash = is_l4; > +#else > + skb->l4_hash = is_l4; > +#endif > +#ifdef HAVE_SW_HASH > + skb->sw_hash = is_sw; > +#endif > +} > +#endif > + > +#ifndef HAVE_SKB_GET_HASH_RAW > +static inline __u32 skb_get_hash_raw(const struct sk_buff *skb) > +{ > +#ifdef HAVE_RXHASH > + return skb->rxhash; > +#else > + return skb->hash; > +#endif > +} > +#endif > + > #endif > -- > 2.1.0 > > _______________________________________________ > dev mailing list > dev@openvswitch.org > https://mail.openvswitch.org/mailman/listinfo/ovs-dev >
On 5/27/20 8:56 AM, aginwala wrote: > Thanks Han for backporting it for lower kernels. I tested this patch with some running workloads with old 3.13* kernels (ovs 2.11*) and it works fine. In addition I am also considering the discussion [1], and for ecmp workloads I see all packets are hitting the different bucket instead of the same bucket (using ssh with single connection). Not a blocker as will plan to upgrade these nodes with 3.13* to newer 4*+ kernels moving further as it's tough to leverage all ovs features for old kernels. > > Tested-by: Aliasgar Ginwala <aginwala@ebay.com <mailto:aginwala@ebay.com>> > > [1] - https://mail.openvswitch.org/pipermail/ovs-discuss/2020-April/049896.html > > On Mon, May 25, 2020 at 11:28 PM Han Zhou <hzhou@ovn.org <mailto:hzhou@ovn.org>> wrote: > > This patch backports below upstream patches, and add __skb_set_hash > to compat for older kernels. > > commit b5ab1f1be6180a2e975eede18731804b5164a05d > Author: Jakub Kicinski <kuba@kernel.org <mailto:kuba@kernel.org>> > Date: Mon Mar 2 21:05:18 2020 -0800 > > openvswitch: add missing attribute validation for hash > > Add missing attribute validation for OVS_PACKET_ATTR_HASH > to the netlink policy. > > Fixes: bd1903b7c459 ("net: openvswitch: add hash info to upcall") > Signed-off-by: Jakub Kicinski <kuba@kernel.org <mailto:kuba@kernel.org>> > Reviewed-by: Greg Rose <gvrose8192@gmail.com <mailto:gvrose8192@gmail.com>> > Signed-off-by: David S. Miller <davem@davemloft.net <mailto:davem@davemloft.net>> > > commit bd1903b7c4596ba6f7677d0dfefd05ba5876707d > Author: Tonghao Zhang <xiangxia.m.yue@gmail.com <mailto:xiangxia.m.yue@gmail.com>> > Date: Wed Nov 13 23:04:49 2019 +0800 > > net: openvswitch: add hash info to upcall > > When using the kernel datapath, the upcall don't > include skb hash info relatived. That will introduce > some problem, because the hash of skb is important > in kernel stack. For example, VXLAN module uses > it to select UDP src port. The tx queue selection > may also use the hash in stack. > > Hash is computed in different ways. Hash is random > for a TCP socket, and hash may be computed in hardware, > or software stack. Recalculation hash is not easy. > > Hash of TCP socket is computed: > tcp_v4_connect > -> sk_set_txhash (is random) > > __tcp_transmit_skb > -> skb_set_hash_from_sk > > There will be one upcall, without information of skb > hash, to ovs-vswitchd, for the first packet of a TCP > session. The rest packets will be processed in Open vSwitch > modules, hash kept. If this tcp session is forward to > VXLAN module, then the UDP src port of first tcp packet > is different from rest packets. > > TCP packets may come from the host or dockers, to Open vSwitch. > To fix it, we store the hash info to upcall, and restore hash > when packets sent back. > > +---------------+ +-------------------------+ > | Docker/VMs | | ovs-vswitchd | > +----+----------+ +-+--------------------+--+ > | ^ | > | | | > | | upcall v restore packet hash > (not recalculate) > | +-+--------------------+--+ > | tap netdev | | vxlan module > +---------------> +--> Open vSwitch ko +--> > or internal type | | > +-------------------------+ > > Reported-at: https://mail.openvswitch.org/pipermail/ovs-dev/2019-October/364062.html > Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com <mailto:xiangxia.m.yue@gmail.com>> > Acked-by: Pravin B Shelar <pshelar@ovn.org <mailto:pshelar@ovn.org>> > Signed-off-by: David S. Miller <davem@davemloft.net <mailto:davem@davemloft.net>> > > Acked-by: Tonghao Zhang <xiangxia.m.yue@gmail.com <mailto:xiangxia.m.yue@gmail.com>> > Signed-off-by: Han Zhou <hzhou@ovn.org <mailto:hzhou@ovn.org>> > --- > v1->v2: Fix build on kernel 3.16 > > acinclude.m4 | 4 ++++ > datapath/datapath.c | 33 +++++++++++++++++++++++++++- > datapath/datapath.h | 12 ++++++++++ > datapath/linux/compat/include/linux/skbuff.h | 31 ++++++++++++++++++++++++++ > 4 files changed, 79 insertions(+), 1 deletion(-) > Thanks! Applied to master. Best regards, Ilya Maximets.
diff --git a/acinclude.m4 b/acinclude.m4 index dabbffd..6bb7983 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -1101,6 +1101,10 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [ OVS_FIND_OP_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h], [validate], [extack], [OVS_DEFINE([HAVE_RTNLOP_VALIDATE_WITH_EXTACK])]) + OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], + [__skb_set_hash]) + OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [sw_hash]) + OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash_raw]) if cmp -s datapath/linux/kcompat.h.new \ datapath/linux/kcompat.h >/dev/null 2>&1; then diff --git a/datapath/datapath.c b/datapath/datapath.c index a7af784..05c1e42 100644 --- a/datapath/datapath.c +++ b/datapath/datapath.c @@ -371,7 +371,8 @@ static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */ - + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */ + + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ + + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ /* OVS_PACKET_ATTR_USERDATA */ if (upcall_info->userdata) @@ -414,6 +415,7 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, size_t len; unsigned int hlen; int err, dp_ifindex; + u64 hash; dp_ifindex = get_dpifindex(dp); if (!dp_ifindex) @@ -523,6 +525,25 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, pad_packet(dp, user_skb); } + /* Add OVS_PACKET_ATTR_HASH */ + hash = skb_get_hash_raw(skb); +#ifdef HAVE_SW_HASH + if (skb->sw_hash) + hash |= OVS_PACKET_HASH_SW_BIT; +#endif + +#ifdef HAVE_L4_RXHASH + if (skb->l4_rxhash) +#else + if (skb->l4_hash) +#endif + hash |= OVS_PACKET_HASH_L4_BIT; + + if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { + err = -ENOBUFS; + goto out; + } + /* Only reserve room for attribute header, packet data is added * in skb_zerocopy() */ @@ -563,6 +584,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) struct datapath *dp; struct vport *input_vport; u16 mru = 0; + u64 hash; int len; int err; bool log = !a[OVS_PACKET_ATTR_PROBE]; @@ -588,6 +610,14 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) } OVS_CB(packet)->mru = mru; + if (a[OVS_PACKET_ATTR_HASH]) { + hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); + + __skb_set_hash(packet, hash & 0xFFFFFFFFULL, + !!(hash & OVS_PACKET_HASH_SW_BIT), + !!(hash & OVS_PACKET_HASH_L4_BIT)); + } + /* Build an sw_flow for sending this packet. */ flow = ovs_flow_alloc(); err = PTR_ERR(flow); @@ -649,6 +679,7 @@ static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, + [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, }; static struct genl_ops dp_packet_genl_ops[] = { diff --git a/datapath/datapath.h b/datapath/datapath.h index 3bffa1d..f99db1f 100644 --- a/datapath/datapath.h +++ b/datapath/datapath.h @@ -159,6 +159,18 @@ struct ovs_net { #endif }; +/** + * enum ovs_pkt_hash_types - hash info to include with a packet + * to send to userspace. + * @OVS_PACKET_HASH_SW_BIT: indicates hash was computed in software stack. + * @OVS_PACKET_HASH_L4_BIT: indicates hash is a canonical 4-tuple hash + * over transport ports. + */ +enum ovs_pkt_hash_types { + OVS_PACKET_HASH_SW_BIT = (1ULL << 32), + OVS_PACKET_HASH_L4_BIT = (1ULL << 33), +}; + extern unsigned int ovs_net_id; void ovs_lock(void); void ovs_unlock(void); diff --git a/datapath/linux/compat/include/linux/skbuff.h b/datapath/linux/compat/include/linux/skbuff.h index 6397289..6d248b3 100644 --- a/datapath/linux/compat/include/linux/skbuff.h +++ b/datapath/linux/compat/include/linux/skbuff.h @@ -456,4 +456,35 @@ static inline void skb_set_inner_ipproto(struct sk_buff *skb, #define nf_reset_ct nf_reset #endif +#ifndef HAVE___SKB_SET_HASH +static inline void +__skb_set_hash(struct sk_buff *skb, __u32 hash, bool is_sw, bool is_l4) +{ +#ifdef HAVE_RXHASH + skb->rxhash = hash; +#else + skb->hash = hash; +#endif +#if defined(HAVE_L4_RXHASH) + skb->l4_rxhash = is_l4; +#else + skb->l4_hash = is_l4; +#endif +#ifdef HAVE_SW_HASH + skb->sw_hash = is_sw; +#endif +} +#endif + +#ifndef HAVE_SKB_GET_HASH_RAW +static inline __u32 skb_get_hash_raw(const struct sk_buff *skb) +{ +#ifdef HAVE_RXHASH + return skb->rxhash; +#else + return skb->hash; +#endif +} +#endif + #endif
This patch backports below upstream patches, and add __skb_set_hash to compat for older kernels. commit b5ab1f1be6180a2e975eede18731804b5164a05d Author: Jakub Kicinski <kuba@kernel.org> Date: Mon Mar 2 21:05:18 2020 -0800 openvswitch: add missing attribute validation for hash Add missing attribute validation for OVS_PACKET_ATTR_HASH to the netlink policy. Fixes: bd1903b7c459 ("net: openvswitch: add hash info to upcall") Signed-off-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Greg Rose <gvrose8192@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> commit bd1903b7c4596ba6f7677d0dfefd05ba5876707d Author: Tonghao Zhang <xiangxia.m.yue@gmail.com> Date: Wed Nov 13 23:04:49 2019 +0800 net: openvswitch: add hash info to upcall When using the kernel datapath, the upcall don't include skb hash info relatived. That will introduce some problem, because the hash of skb is important in kernel stack. For example, VXLAN module uses it to select UDP src port. The tx queue selection may also use the hash in stack. Hash is computed in different ways. Hash is random for a TCP socket, and hash may be computed in hardware, or software stack. Recalculation hash is not easy. Hash of TCP socket is computed: tcp_v4_connect -> sk_set_txhash (is random) __tcp_transmit_skb -> skb_set_hash_from_sk There will be one upcall, without information of skb hash, to ovs-vswitchd, for the first packet of a TCP session. The rest packets will be processed in Open vSwitch modules, hash kept. If this tcp session is forward to VXLAN module, then the UDP src port of first tcp packet is different from rest packets. TCP packets may come from the host or dockers, to Open vSwitch. To fix it, we store the hash info to upcall, and restore hash when packets sent back. +---------------+ +-------------------------+ | Docker/VMs | | ovs-vswitchd | +----+----------+ +-+--------------------+--+ | ^ | | | | | | upcall v restore packet hash (not recalculate) | +-+--------------------+--+ | tap netdev | | vxlan module +---------------> +--> Open vSwitch ko +--> or internal type | | +-------------------------+ Reported-at: https://mail.openvswitch.org/pipermail/ovs-dev/2019-October/364062.html Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> Signed-off-by: Han Zhou <hzhou@ovn.org> --- v1->v2: Fix build on kernel 3.16 acinclude.m4 | 4 ++++ datapath/datapath.c | 33 +++++++++++++++++++++++++++- datapath/datapath.h | 12 ++++++++++ datapath/linux/compat/include/linux/skbuff.h | 31 ++++++++++++++++++++++++++ 4 files changed, 79 insertions(+), 1 deletion(-)