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Date: Wed, 16 Aug 2017 11:15:28 -0400
From: Eric Garver <e@...g.me>
To: Yi Yang <yi.y.yang@...el.com>
Cc: netdev@...r.kernel.org, dev@...nvswitch.org,
Jiri Benc <jbenc@...hat.com>
Subject: Re: [PATCH v3] openvswitch: enable NSH support
On Wed, Aug 16, 2017 at 01:35:30PM +0800, Yi Yang wrote:
> v2->v3
> - Change OVS_KEY_ATTR_NSH to nested key to handle
> length-fixed attributes and length-variable
> attriubte more flexibly.
> - Remove struct ovs_action_push_nsh completely
> - Add code to handle nested attribute for SET_MASKED
> - Change PUSH_NSH to use the nested OVS_KEY_ATTR_NSH
> to transfer NSH header data.
> - Fix comments and coding style issues by Jiri and Eric
Thanks for the updates Yi. Some feedback below.
>
> v1->v2
> - Change encap_nsh and decap_nsh to push_nsh and pop_nsh
> - Dynamically allocate struct ovs_action_push_nsh for
> length-variable metadata.
>
> OVS master and 2.8 branch has merged NSH userspace
> patch series, this patch is to enable NSH support
> in kernel data path in order that OVS can support
> NSH in 2.8 release in compat mode by porting this.
>
> Signed-off-by: Yi Yang <yi.y.yang@...el.com>
> ---
> drivers/net/vxlan.c | 7 +
> include/net/nsh.h | 150 +++++++++++++++++++
> include/uapi/linux/openvswitch.h | 30 ++++
> net/openvswitch/actions.c | 175 ++++++++++++++++++++++
> net/openvswitch/flow.c | 39 +++++
> net/openvswitch/flow.h | 11 ++
> net/openvswitch/flow_netlink.c | 304 ++++++++++++++++++++++++++++++++++++++-
> net/openvswitch/flow_netlink.h | 4 +
> 8 files changed, 719 insertions(+), 1 deletion(-)
> create mode 100644 include/net/nsh.h
>
[..]
> diff --git a/include/net/nsh.h b/include/net/nsh.h
> new file mode 100644
> index 0000000..54f44f6
> --- /dev/null
> +++ b/include/net/nsh.h
> @@ -0,0 +1,150 @@
[..]
> +#define NSH_VER_MASK 0xc000
> +#define NSH_VER_SHIFT 14
> +#define NSH_FLAGS_MASK 0x3fc0
> +#define NSH_FLAGS_SHIFT 6
> +#define NSH_LEN_MASK 0x003f
> +#define NSH_LEN_SHIFT 0
> +
> +#define NSH_SPI_MASK 0xffffff00
> +#define NSH_SPI_SHIFT 8
> +#define NSH_SI_MASK 0x000000ff
> +#define NSH_SI_SHIFT 0
> +
> +#define NSH_DST_PORT 4790 /* UDP Port for NSH on VXLAN. */
> +#define ETH_P_NSH 0x894F /* Ethertype for NSH. */
ETH_P_NSH probably belongs in include/uapi/linux/if_ether.h with all the
other ETH_P_* defines.
> +
> +/* NSH Base Header Next Protocol. */
> +#define NSH_P_IPV4 0x01
> +#define NSH_P_IPV6 0x02
> +#define NSH_P_ETHERNET 0x03
> +#define NSH_P_NSH 0x04
> +#define NSH_P_MPLS 0x05
> +
> +/* MD Type Registry. */
> +#define NSH_M_TYPE1 0x01
> +#define NSH_M_TYPE2 0x02
> +#define NSH_M_EXP1 0xFE
> +#define NSH_M_EXP2 0xFF
> +
> +/* NSH Metadata Length. */
> +#define NSH_M_TYPE1_MDLEN 16
> +
> +/* NSH Base Header Length */
> +#define NSH_BASE_HDR_LEN 8
> +
> +/* NSH MD Type 1 header Length. */
> +#define NSH_M_TYPE1_LEN 24
> +
[..]
> diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
> index 1875bba..6c738d0 100644
> --- a/net/openvswitch/flow.h
> +++ b/net/openvswitch/flow.h
> @@ -35,6 +35,7 @@
> #include <net/inet_ecn.h>
> #include <net/ip_tunnels.h>
> #include <net/dst_metadata.h>
> +#include <net/nsh.h>
>
> struct sk_buff;
>
> @@ -66,6 +67,15 @@ struct vlan_head {
> (offsetof(struct sw_flow_key, recirc_id) + \
> FIELD_SIZEOF(struct sw_flow_key, recirc_id))
>
> +struct ovs_key_nsh {
> + __u8 flags;
> + __u8 mdtype;
> + __u8 np;
> + __u8 pad;
> + __be32 path_hdr;
> + __be32 context[NSH_MD1_CONTEXT_SIZE];
> +};
> +
> struct sw_flow_key {
> u8 tun_opts[IP_TUNNEL_OPTS_MAX];
> u8 tun_opts_len;
> @@ -144,6 +154,7 @@ struct sw_flow_key {
> };
> } ipv6;
> };
> + struct ovs_key_nsh nsh; /* network service header */
Are you intentionally not reserving space in the flow key for
OVS_NSH_KEY_ATTR_MD2? I know it's not supported yet, but much of the
code is stubbed out for it - just making sure this wasn't an oversight.
> struct {
> /* Connection tracking fields not packed above. */
> struct {
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index f07d10a..79059db 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> @@ -78,9 +78,11 @@ static bool actions_may_change_flow(const struct nlattr *actions)
> case OVS_ACTION_ATTR_HASH:
> case OVS_ACTION_ATTR_POP_ETH:
> case OVS_ACTION_ATTR_POP_MPLS:
> + case OVS_ACTION_ATTR_POP_NSH:
> case OVS_ACTION_ATTR_POP_VLAN:
> case OVS_ACTION_ATTR_PUSH_ETH:
> case OVS_ACTION_ATTR_PUSH_MPLS:
> + case OVS_ACTION_ATTR_PUSH_NSH:
> case OVS_ACTION_ATTR_PUSH_VLAN:
> case OVS_ACTION_ATTR_SAMPLE:
> case OVS_ACTION_ATTR_SET:
> @@ -322,12 +324,22 @@ size_t ovs_tun_key_attr_size(void)
> + nla_total_size(2); /* OVS_TUNNEL_KEY_ATTR_TP_DST */
> }
>
> +size_t ovs_nsh_key_attr_size(void)
> +{
> + /* Whenever adding new OVS_NSH_KEY_ FIELDS, we should consider
> + * updating this function.
> + */
> + return nla_total_size(8) /* OVS_NSH_KEY_ATTR_BASE */
> + + nla_total_size(16) /* OVS_NSH_KEY_ATTR_MD1 */
> + + nla_total_size(248); /* OVS_NSH_KEY_ATTR_MD2 */
_MD1 and _MD2 are mutually exclusive. You only need the larger of the
two.
Maybe use OVS_PUSH_NSH_MAX_MD_LEN instead of 248.
> +}
> +
> size_t ovs_key_attr_size(void)
> {
> /* Whenever adding new OVS_KEY_ FIELDS, we should consider
> * updating this function.
> */
> - BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 28);
> + BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 29);
>
> return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
> + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
> @@ -341,6 +353,8 @@ size_t ovs_key_attr_size(void)
> + nla_total_size(4) /* OVS_KEY_ATTR_CT_MARK */
> + nla_total_size(16) /* OVS_KEY_ATTR_CT_LABELS */
> + nla_total_size(40) /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */
> + + nla_total_size(0) /* OVS_KEY_ATTR_NSH */
> + + ovs_nsh_key_attr_size()
> + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
> + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
> + nla_total_size(4) /* OVS_KEY_ATTR_VLAN */
> @@ -373,6 +387,13 @@ static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1]
> [OVS_TUNNEL_KEY_ATTR_IPV6_DST] = { .len = sizeof(struct in6_addr) },
> };
>
> +static const struct ovs_len_tbl
> +ovs_nsh_key_attr_lens[OVS_NSH_KEY_ATTR_MAX + 1] = {
> + [OVS_NSH_KEY_ATTR_BASE] = { .len = 8 },
> + [OVS_NSH_KEY_ATTR_MD1] = { .len = 16 },
> + [OVS_NSH_KEY_ATTR_MD2] = { .len = OVS_ATTR_VARIABLE },
> +};
> +
> /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */
> static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
> [OVS_KEY_ATTR_ENCAP] = { .len = OVS_ATTR_NESTED },
> @@ -405,6 +426,8 @@ static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
> .len = sizeof(struct ovs_key_ct_tuple_ipv4) },
> [OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = {
> .len = sizeof(struct ovs_key_ct_tuple_ipv6) },
> + [OVS_KEY_ATTR_NSH] = { .len = OVS_ATTR_NESTED,
> + .next = ovs_nsh_key_attr_lens, },
> };
>
> static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
> @@ -1179,6 +1202,209 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
> return 0;
> }
>
> +int push_nsh_para_from_nlattr(const struct nlattr *attr,
> + struct push_nsh_para *pnp)
> +{
> + struct nlattr *a;
> + int rem;
> + u8 flags = 0;
> + size_t mdlen = 0;
> +
> + nla_for_each_nested(a, attr, rem) {
> + int type = nla_type(a);
> +
> + if (type > OVS_NSH_KEY_ATTR_MAX) {
> + OVS_NLERR(1, "nsh attr %d is out of range max %d",
> + type, OVS_NSH_KEY_ATTR_MAX);
> + return -EINVAL;
> + }
> +
> + if (!check_attr_len(nla_len(a),
> + ovs_nsh_key_attr_lens[type].len)) {
> + OVS_NLERR(
> + 1,
> + "nsh attr %d has unexpected len %d expected %d",
> + type,
> + nla_len(a),
> + ovs_nsh_key_attr_lens[type].len
> + );
> + return -EINVAL;
> + }
> +
> + switch (type) {
> + case OVS_NSH_KEY_ATTR_BASE: {
> + const struct ovs_nsh_key_base *base =
> + (struct ovs_nsh_key_base *)nla_data(a);
> + flags = base->flags;
> + pnp->next_proto = base->np;
> + pnp->md_type = base->mdtype;
> + pnp->path_hdr = base->path_hdr;
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD1: {
> + const struct ovs_nsh_key_md1 *md1 =
> + (struct ovs_nsh_key_md1 *)nla_data(a);
> +
> + mdlen = nla_len(a);
> + memcpy(pnp->metadata, md1, mdlen);
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD2: {
> + const struct u8 *md2 = nla_data(a);
> +
> + mdlen = nla_len(a);
> + memcpy(pnp->metadata, md2, mdlen);
> + break;
> + }
> + default:
> + OVS_NLERR(1, "Unknown nsh attribute %d",
> + type);
> + return -EINVAL;
> + }
> + }
> +
> + if (rem > 0) {
> + OVS_NLERR(1, "nsh attribute has %d unknown bytes.", rem);
> + return -EINVAL;
> + }
> +
> + /* nsh header length = NSH_BASE_HDR_LEN + mdlen */
> + pnp->ver_flags_len = htons(flags << NSH_FLAGS_SHIFT |
> + (NSH_BASE_HDR_LEN + mdlen) >> 2);
> +
> + return 0;
> +}
> +
> +int nsh_key_from_nlattr(const struct nlattr *attr,
> + struct ovs_key_nsh *nsh)
> +{
> + struct nlattr *a;
> + int rem;
> +
> + nla_for_each_nested(a, attr, rem) {
> + int type = nla_type(a);
> +
> + if (type > OVS_NSH_KEY_ATTR_MAX) {
> + OVS_NLERR(1, "nsh attr %d is out of range max %d",
> + type, OVS_NSH_KEY_ATTR_MAX);
> + return -EINVAL;
> + }
> +
> + if (!check_attr_len(nla_len(a),
> + ovs_nsh_key_attr_lens[type].len)) {
> + OVS_NLERR(
> + 1,
> + "nsh attr %d has unexpected len %d expected %d",
> + type,
> + nla_len(a),
> + ovs_nsh_key_attr_lens[type].len
> + );
> + return -EINVAL;
> + }
> +
> + switch (type) {
> + case OVS_NSH_KEY_ATTR_BASE: {
> + const struct ovs_nsh_key_base *base =
> + (struct ovs_nsh_key_base *)nla_data(a);
> + nsh->flags = base->flags;
> + nsh->mdtype = base->mdtype;
> + nsh->np = base->np;
> + nsh->path_hdr = base->path_hdr;
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD1: {
> + const struct ovs_nsh_key_md1 *md1 =
> + (struct ovs_nsh_key_md1 *)nla_data(a);
> + memcpy(nsh->context, md1->context, sizeof(*md1));
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD2:
> + /* Not supported yet */
> + break;
When we encounter these metadata attributes do we need to verify that
nsh->mdtype is set correctly? Keep in mind we may parse ATTR_MD{1,2}
before ATTR_BASE.
> + default:
> + OVS_NLERR(1, "Unknown nsh attribute %d",
> + type);
> + return -EINVAL;
> + }
> + }
> +
> + if (rem > 0) {
> + OVS_NLERR(1, "nsh attribute has %d unknown bytes.", rem);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int nsh_key_put_from_nlattr(const struct nlattr *attr,
> + struct sw_flow_match *match, bool is_mask,
> + bool log)
> +{
> + struct nlattr *a;
> + int rem;
> +
> + nla_for_each_nested(a, attr, rem) {
> + int type = nla_type(a);
> + int i;
> +
> + if (type > OVS_NSH_KEY_ATTR_MAX) {
> + OVS_NLERR(log, "nsh attr %d is out of range max %d",
> + type, OVS_NSH_KEY_ATTR_MAX);
> + return -EINVAL;
> + }
> +
> + if (!check_attr_len(nla_len(a),
> + ovs_nsh_key_attr_lens[type].len)) {
> + OVS_NLERR(
> + log,
> + "nsh attr %d has unexpected len %d expected %d",
> + type,
> + nla_len(a),
> + ovs_nsh_key_attr_lens[type].len
> + );
> + return -EINVAL;
> + }
> +
> + switch (type) {
> + case OVS_NSH_KEY_ATTR_BASE: {
> + const struct ovs_nsh_key_base *base =
> + (struct ovs_nsh_key_base *)nla_data(a);
> + SW_FLOW_KEY_PUT(match, nsh.flags,
> + base->flags, is_mask);
> + SW_FLOW_KEY_PUT(match, nsh.mdtype,
> + base->mdtype, is_mask);
> + SW_FLOW_KEY_PUT(match, nsh.np,
> + base->np, is_mask);
> + SW_FLOW_KEY_PUT(match, nsh.path_hdr,
> + base->path_hdr, is_mask);
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD1: {
> + const struct ovs_nsh_key_md1 *md1 =
> + (struct ovs_nsh_key_md1 *)nla_data(a);
> + for (i = 0; i < 4; i++)
> + SW_FLOW_KEY_PUT(match, nsh.context[i],
> + md1->context[i], is_mask);
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD2:
> + /* Not supported yet */
> + break;
> + default:
> + OVS_NLERR(log, "Unknown nsh attribute %d",
> + type);
> + return -EINVAL;
> + }
> + }
> +
> + if (rem > 0) {
> + OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
> u64 attrs, const struct nlattr **a,
> bool is_mask, bool log)
[..]
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