[ovs-dev] [PATCH] datapath: Add support for kernel 3.13
Kyle Mestery
mestery at noironetworks.com
Thu Mar 27 18:19:29 UTC 2014
Pravin, one more change I want to make here. Since 3.14 is almost out,
would you be ok if I bump this up to claim 3.14 support? I don't see any
large API changes coming out between now and when 3.14 is due next
week, so let me know. Otherwise, I can do another patch for 3.14 next
week.
Thanks,
Kyle
On Thu, Mar 27, 2014 at 1:17 PM, Kyle Mestery <mestery at noironetworks.com>wrote:
> Add support for building the in-tree kernel datapath for Linux kernel 3.13.
> There were some changes in the netlink area which required adding new
> compatibility code for this layer.
>
> Signed-off-by: Kyle Mestery <mestery at noironetworks.com>
> ---
> v3: Correctly make genl_register_family backwards compatible.
>
> v2: Address a few comments from Pravin. Some of those comments
> proved challenging, please see email reply to the list.
> ---
> FAQ | 2 +-
> acinclude.m4 | 4 +-
> datapath/datapath.c | 28 +++++-----
> datapath/datapath.h | 1 +
> datapath/dp_notify.c | 11 ++--
> datapath/linux/compat/genetlink-openvswitch.c | 20 +++++--
> datapath/linux/compat/include/net/genetlink.h | 75
> ++++++++++++++++++++++++++-
> datapath/linux/compat/include/net/ip.h | 12 +++++
> datapath/linux/compat/utils.c | 3 ++
> datapath/vport-lisp.c | 7 +--
> datapath/vport-vxlan.c | 3 +-
> 11 files changed, 130 insertions(+), 36 deletions(-)
>
> diff --git a/FAQ b/FAQ
> index dae5c5b..5ca6d22 100644
> --- a/FAQ
> +++ b/FAQ
> @@ -148,7 +148,7 @@ A: The following table lists the Linux kernel versions
> against which the
> 1.10.x 2.6.18 to 3.8
> 1.11.x 2.6.18 to 3.8
> 2.0.x 2.6.32 to 3.10
> - 2.1.x 2.6.32 to 3.12
> + 2.1.x 2.6.32 to 3.13
>
> Open vSwitch userspace should also work with the Linux kernel module
> built into Linux 3.3 and later.
> diff --git a/acinclude.m4 b/acinclude.m4
> index 1f52cf1..4269620 100644
> --- a/acinclude.m4
> +++ b/acinclude.m4
> @@ -134,10 +134,10 @@ AC_DEFUN([OVS_CHECK_LINUX], [
> AC_MSG_RESULT([$kversion])
>
> if test "$version" -ge 3; then
> - if test "$version" = 3 && test "$patchlevel" -le 12; then
> + if test "$version" = 3 && test "$patchlevel" -le 13; then
> : # Linux 3.x
> else
> - AC_ERROR([Linux kernel in $KBUILD is version $kversion, but
> version newer than 3.12.x is not supported])
> + AC_ERROR([Linux kernel in $KBUILD is version $kversion, but
> version newer than 3.13.x is not supported])
> fi
> else
> if test "$version" -le 1 || test "$patchlevel" -le 5 || test
> "$sublevel" -le 31; then
> diff --git a/datapath/datapath.c b/datapath/datapath.c
> index 93f8e36..03db87a 100644
> --- a/datapath/datapath.c
> +++ b/datapath/datapath.c
> @@ -64,11 +64,13 @@
>
> int ovs_net_id __read_mostly;
>
> +static struct genl_family dp_packet_genl_family;
> +
> static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
> struct genl_multicast_group *grp)
> {
> - genl_notify(skb, genl_info_net(info), info->snd_portid,
> - grp->id, info->nlhdr, GFP_KERNEL);
> + genl_notify(&dp_packet_genl_family, skb, genl_info_net(info),
> + info->snd_portid, 0, info->nlhdr, GFP_KERNEL);
> }
>
> /**
> @@ -888,8 +890,8 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff
> *skb, struct genl_info *info)
> if (!IS_ERR(reply))
> ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
> else
> - netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
> - ovs_dp_flow_multicast_group.id,
> PTR_ERR(reply));
> + genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
> + 0, PTR_ERR(reply));
> return 0;
>
> err_flow_free:
> @@ -1368,8 +1370,8 @@ static int ovs_dp_cmd_set(struct sk_buff *skb,
> struct genl_info *info)
> reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
> if (IS_ERR(reply)) {
> err = PTR_ERR(reply);
> - netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
> - ovs_dp_datapath_multicast_group.id, err);
> + genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk),
> 0,
> + 0, err);
> err = 0;
> goto unlock;
> }
> @@ -1466,7 +1468,7 @@ static const struct nla_policy
> vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
> [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
> };
>
> -static struct genl_family dp_vport_genl_family = {
> +struct genl_family dp_vport_genl_family = {
> .id = GENL_ID_GENERATE,
> .hdrsize = sizeof(struct ovs_header),
> .name = OVS_VPORT_FAMILY,
> @@ -1863,19 +1865,13 @@ static int dp_register_genl(void)
>
> n_registered = 0;
> for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
> - const struct genl_family_and_ops *f = &dp_genl_families[i];
> + const struct genl_family_and_ops_ovs *f =
> + (struct genl_family_and_ops_ovs
> *)&dp_genl_families[i];
>
> - err = genl_register_family_with_ops(f->family, f->ops,
> - f->n_ops);
> + err = genl_register_family_ovs(f);
> if (err)
> goto error;
> n_registered++;
> -
> - if (f->group) {
> - err = genl_register_mc_group(f->family, f->group);
> - if (err)
> - goto error;
> - }
> }
>
> return 0;
> diff --git a/datapath/datapath.h b/datapath/datapath.h
> index d81e05c..40e0f90 100644
> --- a/datapath/datapath.h
> +++ b/datapath/datapath.h
> @@ -184,6 +184,7 @@ static inline struct vport *ovs_vport_ovsl(const
> struct datapath *dp, int port_n
> }
>
> extern struct notifier_block ovs_dp_device_notifier;
> +extern struct genl_family dp_vport_genl_family;
> extern struct genl_multicast_group ovs_dp_vport_multicast_group;
>
> void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
> diff --git a/datapath/dp_notify.c b/datapath/dp_notify.c
> index 0b22d0c..e96b242 100644
> --- a/datapath/dp_notify.c
> +++ b/datapath/dp_notify.c
> @@ -35,15 +35,14 @@ static void dp_detach_port_notify(struct vport *vport)
> OVS_VPORT_CMD_DEL);
> ovs_dp_detach_port(vport);
> if (IS_ERR(notify)) {
> - netlink_set_err(ovs_dp_get_net(dp)->genl_sock, 0,
> - ovs_dp_vport_multicast_group.id,
> - PTR_ERR(notify));
> + genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,
> + 0, PTR_ERR(notify));
> return;
> }
>
> - genlmsg_multicast_netns(ovs_dp_get_net(dp), notify, 0,
> - ovs_dp_vport_multicast_group.id,
> - GFP_KERNEL);
> + genlmsg_multicast_netns(&dp_vport_genl_family,
> + ovs_dp_get_net(dp), notify, 0,
> + 0, GFP_KERNEL);
> }
>
> void ovs_dp_notify_wq(struct work_struct *work)
> diff --git a/datapath/linux/compat/genetlink-openvswitch.c
> b/datapath/linux/compat/genetlink-openvswitch.c
> index 359f916..b987aff 100644
> --- a/datapath/linux/compat/genetlink-openvswitch.c
> +++ b/datapath/linux/compat/genetlink-openvswitch.c
> @@ -1,17 +1,27 @@
> #include <net/genetlink.h>
> #include <linux/version.h>
>
> -/* This is analogous to rtnl_notify() but uses genl_sock instead of rtnl.
> - *
> - * This is not (yet) in any upstream kernel. */
> -void genl_notify(struct sk_buff *skb, struct net *net, u32 portid, u32
> group,
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0)
> +void genl_notify(struct genl_family *family,
> + struct sk_buff *skb, struct net *net, u32 portid, u32
> group,
> struct nlmsghdr *nlh, gfp_t flags)
> {
> struct sock *sk = net->genl_sock;
> int report = 0;
> + struct genl_multicast_group *grp;
> + int i = 0;
>
> if (nlh)
> report = nlmsg_report(nlh);
>
> - nlmsg_notify(sk, skb, portid, group, report, flags);
> + list_for_each_entry(grp, &family->mcast_groups, list) {
> + if (group == 0)
> + break;
> + i++;
> + }
> +
> + if (WARN_ON_ONCE(grp == NULL))
> + return;
> + nlmsg_notify(sk, skb, portid, grp->id, report, flags);
> }
> +#endif /* kernel version < 3.13.0 */
> diff --git a/datapath/linux/compat/include/net/genetlink.h
> b/datapath/linux/compat/include/net/genetlink.h
> index 09ee23b..d8d1733 100644
> --- a/datapath/linux/compat/include/net/genetlink.h
> +++ b/datapath/linux/compat/include/net/genetlink.h
> @@ -17,8 +17,43 @@
> #define portid pid
> #endif
>
> -extern void genl_notify(struct sk_buff *skb, struct net *net, u32 portid,
> - u32 group, struct nlmsghdr *nlh, gfp_t flags);
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0)
> +#define genl_notify rpl__genl_notify
> +void genl_notify(struct genl_family *family,
> + struct sk_buff *skb, struct net *net, u32 portid, u32
> group,
> + struct nlmsghdr *nlh, gfp_t flags);
> +
> +#define genl_set_err rpl__genl_set_err
> +static inline int genl_set_err(struct genl_family *family, struct net
> *net,
> + u32 portid, u32 group, int code)
> +{
> + struct genl_multicast_group *grp;
> +
> + list_for_each_entry(grp, &family->mcast_groups, list) {
> + if (group == grp->id)
> + break;
> + }
> +
> + return netlink_set_err(net->genl_sock, portid, grp->id, code);
> +}
> +
> +#define genlmsg_multicast_netns rpl__genlmsg_multicast_netns
> +static inline int genlmsg_multicast_netns(struct genl_family *family,
> + struct net *net, struct sk_buff
> *skb,
> + u32 portid, unsigned int group,
> gfp_t flags)
> +{
> + struct genl_multicast_group *grp;
> +
> + list_for_each_entry(grp, &family->mcast_groups, list) {
> + if (group == grp->id)
> + break;
> + }
> +
> + if (WARN_ON_ONCE(grp == NULL))
> + return -EINVAL;
> + return nlmsg_multicast(net->genl_sock, skb, portid, grp->id,
> flags);
> +}
> +#endif
>
> #if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
> static inline struct sk_buff *genlmsg_new_unicast(size_t payload,
> @@ -29,4 +64,40 @@ static inline struct sk_buff
> *genlmsg_new_unicast(size_t payload,
> }
> #endif
>
> +struct genl_family_and_ops_ovs {
> + struct genl_family *family;
> + struct genl_ops *ops;
> + int n_ops;
> + struct genl_multicast_group *group;
> +};
> +
> +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,13,0)
> +static inline int genl_register_family_ovs(const struct
> genl_family_and_ops_ovs *f)
> +{
> + f->family->ops = f->ops;
> + f->family->n_ops = f->n_ops;
> + f->family->mcgrps = f->group;
> + f->family->n_mcgrps = f->group ? 1 : 0;
> +
> + return genl_register_family(f->family);
> +}
> +#else
> +static inline int genl_register_family_ovs(const struct
> genl_family_and_ops_ovs *f)
> +{
> + int err;
> +
> + err = genl_register_family_with_ops(f->family, f->ops, f->n_ops);
> + if (err)
> + goto error;
> +
> + if (f->group) {
> + err = genl_register_mc_group(f->family, f->group);
> + if (err)
> + goto error;
> + }
> +error:
> + return err;
> +}
> +#endif
> +
> #endif /* genetlink.h */
> diff --git a/datapath/linux/compat/include/net/ip.h
> b/datapath/linux/compat/include/net/ip.h
> index 4193d32..4fd0b2c 100644
> --- a/datapath/linux/compat/include/net/ip.h
> +++ b/datapath/linux/compat/include/net/ip.h
> @@ -12,4 +12,16 @@ static inline bool ip_is_fragment(const struct iphdr
> *iph)
> }
> #endif
>
> +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,13,0)
> +#define inet_get_local_port_range_ovs(a, b, c) \
> + inet_get_local_port_range(a, b, c)
> +#else
> +static inline void inet_get_local_port_range_ovs(struct net *net, int
> *low,
> + int *high)
> +{
> + (void)(net);
> + inet_get_local_port_range(low, high);
> +}
> +#endif
> +
> #endif
> diff --git a/datapath/linux/compat/utils.c b/datapath/linux/compat/utils.c
> index dc4df2a..9404e20 100644
> --- a/datapath/linux/compat/utils.c
> +++ b/datapath/linux/compat/utils.c
> @@ -6,6 +6,7 @@
> #include <linux/mm.h>
> #include <linux/net.h>
> #include <net/checksum.h>
> +#include <net/ip.h>
> #include <linux/string.h>
> #include <linux/types.h>
> #include <linux/percpu.h>
> @@ -38,6 +39,7 @@ void inet_proto_csum_replace16(__sum16 *sum, struct
> sk_buff *skb,
> }
> #endif
>
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0)
> bool __net_get_random_once(void *buf, int nbytes, bool *done,
> atomic_t *done_key)
> {
> @@ -58,3 +60,4 @@ bool __net_get_random_once(void *buf, int nbytes, bool
> *done,
>
> return true;
> }
> +#endif
> diff --git a/datapath/vport-lisp.c b/datapath/vport-lisp.c
> index e33cffe..a1e4ca2 100644
> --- a/datapath/vport-lisp.c
> +++ b/datapath/vport-lisp.c
> @@ -163,7 +163,7 @@ static __be64 instance_id_to_tunnel_id(__u8 *iid)
> /* Compute source UDP port for outgoing packet.
> * Currently we use the flow hash.
> */
> -static u16 get_src_port(struct sk_buff *skb)
> +static u16 get_src_port(struct net *net, struct sk_buff *skb)
> {
> u32 hash = skb_get_rxhash(skb);
> unsigned int range;
> @@ -177,7 +177,7 @@ static u16 get_src_port(struct sk_buff *skb)
> sizeof(*pkt_key) / sizeof(u32), 0);
> }
>
> - inet_get_local_port_range(&low, &high);
> + inet_get_local_port_range_ovs(net, &low, &high);
> range = (high - low) + 1;
> return (((u64) hash * range) >> 32) + low;
> }
> @@ -185,13 +185,14 @@ static u16 get_src_port(struct sk_buff *skb)
> static void lisp_build_header(const struct vport *vport,
> struct sk_buff *skb)
> {
> + struct net *net = ovs_dp_get_net(vport->dp);
> struct lisp_port *lisp_port = lisp_vport(vport);
> struct udphdr *udph = udp_hdr(skb);
> struct lisphdr *lisph = (struct lisphdr *)(udph + 1);
> const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
>
> udph->dest = lisp_port->dst_port;
> - udph->source = htons(get_src_port(skb));
> + udph->source = htons(get_src_port(net, skb));
> udph->check = 0;
> udph->len = htons(skb->len - skb_transport_offset(skb));
>
> diff --git a/datapath/vport-vxlan.c b/datapath/vport-vxlan.c
> index d264785..4b36253 100644
> --- a/datapath/vport-vxlan.c
> +++ b/datapath/vport-vxlan.c
> @@ -139,6 +139,7 @@ error:
>
> static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
> {
> + struct net *net = ovs_dp_get_net(vport->dp);
> struct vxlan_port *vxlan_port = vxlan_vport(vport);
> __be16 dst_port = inet_sport(vxlan_port->vs->sock->sk);
> struct rtable *rt;
> @@ -172,7 +173,7 @@ static int vxlan_tnl_send(struct vport *vport, struct
> sk_buff *skb)
>
> skb->local_df = 1;
>
> - inet_get_local_port_range(&port_min, &port_max);
> + inet_get_local_port_range_ovs(net, &port_min, &port_max);
> src_port = vxlan_src_port(port_min, port_max, skb);
>
> err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
> --
> 1.8.5.3
>
>
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