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0003-Add-userspace-dataplane-nsh-support-and-remove-push_.patch
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0003-Add-userspace-dataplane-nsh-support-and-remove-push_.patch
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From ec5272ed6684bbd0ae8c38a5e6488414347a941f Mon Sep 17 00:00:00 2001
From: Yi Yang <[email protected]>
Date: Wed, 13 Apr 2016 16:39:27 +0800
Subject: [PATCH 3/5] Add userspace dataplane nsh support and remove push_eth
and pop_eth actions
Signed-off-by: Mengke Liu <[email protected]>
Signed-off-by: Ricky Li <[email protected]>
Signed-off-by: Johnson Li <[email protected]>
Signed-off-by: Yi Yang <[email protected]>
---
datapath/actions.c | 53 +---
datapath/flow.c | 50 ++--
datapath/flow.h | 16 +-
datapath/flow_netlink.c | 44 +--
datapath/linux/compat/include/linux/openvswitch.h | 112 ++++++--
datapath/linux/compat/include/net/vxlan.h | 9 +-
datapath/linux/compat/vxlan.c | 15 ++
lib/dpif-netdev.c | 30 ++-
lib/dpif.c | 2 -
lib/flow.c | 99 ++++++-
lib/flow.h | 14 +-
lib/match.c | 13 +-
lib/match.h | 2 +-
lib/meta-flow.h | 2 +-
lib/netdev-vport.c | 76 +++++-
lib/netdev-vport.h | 6 +
lib/nx-match.c | 3 +-
lib/odp-execute.c | 23 +-
lib/odp-util.c | 314 ++++++----------------
lib/odp-util.h | 6 +-
lib/ofp-actions.c | 82 +-----
lib/ofp-actions.h | 2 -
lib/packets.c | 23 ++
lib/packets.h | 3 +
ofproto/ofproto-dpif-sflow.c | 1 -
ofproto/ofproto-dpif-upcall.c | 8 -
ofproto/ofproto-dpif-xlate.c | 13 +-
ofproto/ofproto-dpif.h | 1 -
ofproto/tunnel.c | 1 +
tests/ofproto.at | 1 -
tests/tunnel.at | 189 +++++++++++--
31 files changed, 666 insertions(+), 547 deletions(-)
diff --git a/datapath/actions.c b/datapath/actions.c
index 16fc58f..7072638 100644
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -254,10 +254,10 @@ static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key)
{
- if (!pskb_may_pull(skb, NSH_M_TYPE1_LEN))
+ if (!pskb_may_pull(skb, ETH_NSH_TYPE1_HEADER_SIZE))
return -ENOMEM;
else
- __skb_pull(skb, NSH_M_TYPE1_LEN);
+ __skb_pull(skb, ETH_NSH_TYPE1_HEADER_SIZE);
return 0;
}
@@ -267,48 +267,21 @@ static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key,
{
if (nsh->nsh_mdtype == NSH_M_TYPE1) {
- if (skb_cow_head(skb, NSH_M_TYPE1_LEN) < 0)
- return -ENOMEM;
-
- skb_push(skb, NSH_M_TYPE1_LEN);
- OVS_CB(skb)->nsh_header = skb->data;
- memcpy(OVS_CB(skb)->nsh_header, nsh->header, NSH_M_TYPE1_LEN);
- }
- else
- return -EINVAL;
-
- return 0;
-}
-
-static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
-{
- if (!pskb_may_pull(skb, ENCAP_ETH_PUSH_HEADER_SIZE))
- return -ENOMEM;
- else
- __skb_pull(skb, ENCAP_ETH_PUSH_HEADER_SIZE);
-
- return 0;
-}
-
-static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
- const struct ovs_action_push_eth *encap_eth)
-{
- if (encap_eth->encap_eth_type == htons(ETH_P_NSH)) {
- if (skb_cow_head(skb, ENCAP_ETH_PUSH_HEADER_SIZE) < 0)
+ if (skb_cow_head(skb, ETH_NSH_TYPE1_HEADER_SIZE) < 0) {
return -ENOMEM;
+ }
- skb_push(skb, ENCAP_ETH_PUSH_HEADER_SIZE);
- OVS_CB(skb)->encap_eth_header = skb->data;
- memcpy(OVS_CB(skb)->encap_eth_header, encap_eth->header, ENCAP_ETH_PUSH_HEADER_SIZE);
+ skb_push(skb, ETH_NSH_TYPE1_HEADER_SIZE);
+ OVS_CB(skb)->encap_eth_header = (struct encap_eth_hdr *)skb->data;
+ OVS_CB(skb)->nsh_header = (struct nsh_hdr *)(skb->data + ENCAP_ETH_LEN);
+ memcpy(skb->data, nsh->header, ETH_NSH_TYPE1_HEADER_SIZE);
}
- else {
+ else
return -EINVAL;
- }
return 0;
}
-
/* 'src' is already properly masked. */
static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
{
@@ -1144,14 +1117,6 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
err = pop_nsh(skb, key);
break;
- case OVS_ACTION_ATTR_PUSH_ETH:
- err = push_eth(skb, key, nla_data(a));
- break;
-
- case OVS_ACTION_ATTR_POP_ETH:
- err = pop_eth(skb, key);
- break;
-
case OVS_ACTION_ATTR_RECIRC:
err = execute_recirc(dp, skb, key, a, rem);
if (nla_is_last(a, rem)) {
diff --git a/datapath/flow.c b/datapath/flow.c
index 67b2f1d..e3f33f8 100644
--- a/datapath/flow.c
+++ b/datapath/flow.c
@@ -320,8 +320,12 @@ static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
}
static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key){
- struct nsh_hdr *nsh_hdr = (struct nsh_hdr *)skb->data;
+ struct nsh_hdr *nsh_hdr = NULL;
+
+ OVS_CB(skb)->encap_eth_header = (struct encap_eth_hdr *)skb->data;
+ nsh_hdr = (struct nsh_hdr *)((const char *)skb->data + ENCAP_ETH_LEN);
OVS_CB(skb)->nsh_header = nsh_hdr;
+ memcpy(&key->nsh.encap_eth_dst, skb->data, ENCAP_ETH_LEN);
key->nsh.nsh_mdtype = nsh_hdr->base.mdtype;
if (key->nsh.nsh_mdtype != NSH_M_TYPE1)
return -EPERM;
@@ -335,16 +339,6 @@ static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key){
return 0;
}
-static void parse_encap_eth(struct sk_buff *skb, struct sw_flow_key *key){
- struct encap_eth_hdr *encap_eth_header = (struct encap_eth_hdr *)skb->data;
- OVS_CB(skb)->encap_eth_header = encap_eth_header;
- key->encap_eth.encap_eth_type = encap_eth_header->encap_eth_type;
- ether_addr_copy(key->encap_eth.encap_eth_src, encap_eth_header->encap_eth_src);
- ether_addr_copy(key->encap_eth.encap_eth_dst, encap_eth_header->encap_eth_dst);
-
- return;
-}
-
static __be16 parse_ethertype(struct sk_buff *skb)
{
struct llc_snap_hdr {
@@ -483,23 +477,21 @@ static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
{
int error;
struct ethhdr *eth;
+ int is_eth_nsh = 0;
/* Extract ethernet+nsh if ethernet type is 0x894F */
eth = (struct ethhdr *)skb->data;
if (eth->h_proto == htons(ETH_P_NSH)) {
- parse_encap_eth(skb, key);
- __skb_pull(skb, ENCAP_ETH_LEN);
-
if (unlikely(parse_nsh(skb, key)))
return -EINVAL;
if (key->nsh.nsh_mdtype == NSH_M_TYPE1 && key->nsh.nsh_np == NSH_P_ETHERNET) {
- __skb_pull(skb, NSH_M_TYPE1_LEN);
+ __skb_pull(skb, ENCAP_ETH_LEN + NSH_M_TYPE1_LEN);
+ is_eth_nsh = 1;
} else {
return -EINVAL;
}
} else {
- void *encap_eth_hdr = &(key->encap_eth);
- memset(encap_eth_hdr, 0, ENCAP_ETH_LEN);
+ memset(&key->nsh, 0, sizeof(key->nsh));
}
/* Flags are always used as part of stats */
@@ -722,15 +714,15 @@ static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
}
}
- if (key->encap_eth.encap_eth_type == htons(ETH_P_NSH))
+ if (is_eth_nsh == 1) {
__skb_push(skb, ENCAP_ETH_LEN + NSH_M_TYPE1_LEN);
+ }
return 0;
}
-static void ovs_key_nsh_init(struct sw_flow_key *key, __u16 len) {
- void *nsh_hdr = &(key->nsh);
- memset(nsh_hdr, 0, len);
+static void ovs_key_nsh_init(struct sw_flow_key *key) {
+ memset(&key->nsh, 0, sizeof(key->nsh));
}
static int nsh_extract(struct sk_buff *skb, struct sw_flow_key *key) {
@@ -740,16 +732,16 @@ static int nsh_extract(struct sk_buff *skb, struct sw_flow_key *key) {
if (unlikely(parse_nsh(skb, key)))
return -EINVAL;
if (key->nsh.nsh_mdtype == NSH_M_TYPE1) {
- __skb_pull(skb, NSH_M_TYPE1_LEN);
+ __skb_pull(skb, ENCAP_ETH_LEN + NSH_M_TYPE1_LEN);
if(key->nsh.nsh_np == NSH_P_ETHERNET)
ret = key_extract(skb, key);
else
return -EINVAL;
- __skb_push(skb, NSH_M_TYPE1_LEN);
+ __skb_push(skb, ENCAP_ETH_LEN + NSH_M_TYPE1_LEN);
return ret;
} else {
- ovs_key_nsh_init(key, NSH_M_TYPE1_LEN);
+ ovs_key_nsh_init(key);
}
return 0;
@@ -760,7 +752,7 @@ static bool is_nsh_header(const void *tun_opts, __be16 tun_flags) {
if (tun_opts && (tun_flags & TUNNEL_VXLAN_OPT))
md = (struct vxlan_metadata *)tun_opts;
- if (md && (md->gpe & VXLAN_GPE_NP_MASK) == VXLAN_GPE_NP_NSH)
+ if (md && ((md->gpe & VXLAN_GPE_NP_MASK) == VXLAN_GPE_NP_NSH))
return true;
else
return false;
@@ -768,7 +760,7 @@ static bool is_nsh_header(const void *tun_opts, __be16 tun_flags) {
int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
{
- ovs_key_nsh_init(key, NSH_M_TYPE1_LEN);
+ ovs_key_nsh_init(key);
return key_extract(skb, key);
}
@@ -804,13 +796,13 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
key->recirc_id = 0;
/* Extract NSH and inner Ethernet if NSH header exists */
- if (tun_info && is_nsh_header(ip_tunnel_info_opts(tun_info), key->tun_key.tun_flags)) {
+ if (tun_info && is_nsh_header(TUN_METADATA_OPTS(key, key->tun_opts_len), key->tun_key.tun_flags)) {
int ret ;
ret = nsh_extract(skb, key);
if (key->nsh.nsh_mdtype)
return ret;
} else {
- ovs_key_nsh_init(key, NSH_M_TYPE1_LEN);
+ ovs_key_nsh_init(key);
}
return key_extract(skb, key);
}
@@ -833,7 +825,7 @@ int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
if (key->nsh.nsh_mdtype)
return ret;
} else {
- ovs_key_nsh_init(key, NSH_M_TYPE1_LEN);
+ ovs_key_nsh_init(key);
}
return key_extract(skb, key);
diff --git a/datapath/flow.h b/datapath/flow.h
index c8ccd5f..c00144a 100644
--- a/datapath/flow.h
+++ b/datapath/flow.h
@@ -63,21 +63,7 @@ struct sw_flow_key {
u32 skb_mark; /* SKB mark. */
u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
} __packed phy; /* Safe when right after 'tun_key'. */
- struct {
- u32 nshc1; /* NSH context C1-C4 */
- u32 nshc2;
- u32 nshc3;
- u32 nshc4;
- u32 nsp; /* NSH path id */
- u8 nsi; /* NSH index */
- u8 nsh_mdtype; /* NSH metadata type */
- u8 nsh_np; /* NSH next protocol */
- }__packed nsh; /* network service header */
- struct {
- u8 encap_eth_src[ETH_ALEN]; /* ENCAP ethernet source address. */
- u8 encap_eth_dst[ETH_ALEN]; /* ENCAP ethernet destination address. */
- u16 encap_eth_type; /* ENCAP ethernet type. */
- } encap_eth;
+ struct ovs_key_nsh nsh; /* network service header */
u32 ovs_flow_hash; /* Datapath computed hash value. */
u32 recirc_id; /* Recirculation ID. */
struct {
diff --git a/datapath/flow_netlink.c b/datapath/flow_netlink.c
index ebfae37..3e26ac5 100644
--- a/datapath/flow_netlink.c
+++ b/datapath/flow_netlink.c
@@ -284,7 +284,7 @@ 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 != 27);
return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
+ nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
@@ -297,8 +297,7 @@ size_t ovs_key_attr_size(void)
+ nla_total_size(2) /* OVS_KEY_ATTR_CT_ZONE */
+ nla_total_size(4) /* OVS_KEY_ATTR_CT_MARK */
+ nla_total_size(16) /* OVS_KEY_ATTR_CT_LABELS */
- + nla_total_size(24) /* OVS_KEY_ATTR_NSH */
- + nla_total_size(14) /* OVS_KEY_ATTR_ENCAP_ETH */
+ + nla_total_size(40) /* OVS_KEY_ATTR_NSH */
+ nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
+ nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
+ nla_total_size(4) /* OVS_KEY_ATTR_VLAN */
@@ -337,7 +336,6 @@ static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
[OVS_KEY_ATTR_IN_PORT] = { .len = sizeof(u32) },
[OVS_KEY_ATTR_SKB_MARK] = { .len = sizeof(u32) },
[OVS_KEY_ATTR_NSH] = { .len = sizeof(struct ovs_key_nsh) },
- [OVS_KEY_ATTR_ENCAP_ETH] = { .len = sizeof(struct ovs_key_encap_eth) },
[OVS_KEY_ATTR_ETHERNET] = { .len = sizeof(struct ovs_key_ethernet) },
[OVS_KEY_ATTR_VLAN] = { .len = sizeof(__be16) },
[OVS_KEY_ATTR_ETHERTYPE] = { .len = sizeof(__be16) },
@@ -877,6 +875,12 @@ static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
const struct ovs_key_nsh *nsh_key;
nsh_key = nla_data(a[OVS_KEY_ATTR_NSH]);
+ SW_FLOW_KEY_MEMCPY(match, nsh.encap_eth_src,
+ nsh_key->encap_eth_src, ETH_ALEN, is_mask);
+ SW_FLOW_KEY_MEMCPY(match, nsh.encap_eth_dst,
+ nsh_key->encap_eth_dst, ETH_ALEN, is_mask);
+ SW_FLOW_KEY_PUT(match, nsh.encap_eth_type,
+ nsh_key->encap_eth_type, is_mask);
SW_FLOW_KEY_PUT(match, nsh.nshc1,
nsh_key->nshc1, is_mask);
SW_FLOW_KEY_PUT(match, nsh.nshc2,
@@ -896,19 +900,6 @@ static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
attrs &= ~(1ULL << OVS_KEY_ATTR_NSH);
}
- if (attrs & (1ULL << OVS_KEY_ATTR_ENCAP_ETH)) {
- const struct ovs_key_encap_eth *encap_eth_key;
-
- encap_eth_key = nla_data(a[OVS_KEY_ATTR_ENCAP_ETH]);
- SW_FLOW_KEY_MEMCPY(match, encap_eth.encap_eth_src,
- encap_eth_key->encap_eth_src, ETH_ALEN, is_mask);
- SW_FLOW_KEY_MEMCPY(match, encap_eth.encap_eth_dst,
- encap_eth_key->encap_eth_dst, ETH_ALEN, is_mask);
- SW_FLOW_KEY_PUT(match, encap_eth.encap_eth_type,
- encap_eth_key->encap_eth_type, is_mask);
- attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP_ETH);
- }
-
if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
const struct ovs_key_ethernet *eth_key;
@@ -1433,6 +1424,9 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
if (!nla)
goto nla_put_failure;
nsh_key = nla_data(nla);
+ memcpy(nsh_key->encap_eth_dst, output->nsh.encap_eth_dst, ETH_ALEN);
+ memcpy(nsh_key->encap_eth_src, output->nsh.encap_eth_src, ETH_ALEN);
+ nsh_key->encap_eth_type = output->nsh.encap_eth_type;
nsh_key->nsi = output->nsh.nsi;
nsh_key->nsp = output->nsh.nsp;
nsh_key->nsh_mdtype= output->nsh.nsh_mdtype;
@@ -1443,18 +1437,6 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
nsh_key->nshc4 = output->nsh.nshc4;
}
- if ((swkey->encap_eth.encap_eth_type || is_mask)) {
- struct ovs_key_encap_eth *encap_eth_key;
-
- nla = nla_reserve(skb, OVS_KEY_ATTR_ENCAP_ETH, sizeof(*encap_eth_key));
- if (!nla)
- goto nla_put_failure;
- encap_eth_key = nla_data(nla);
- memcpy(encap_eth_key->encap_eth_src, output->encap_eth.encap_eth_src, ETH_ALEN);
- memcpy(encap_eth_key->encap_eth_dst, output->encap_eth.encap_eth_dst, ETH_ALEN);
- encap_eth_key->encap_eth_type= output->encap_eth.encap_eth_type;
- }
-
if ((swkey->tun_key.u.ipv4.dst || is_mask)) {
const void *opts = NULL;
@@ -2253,8 +2235,6 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
[OVS_ACTION_ATTR_POP_VLAN] = 0,
[OVS_ACTION_ATTR_PUSH_NSH] = sizeof(struct ovs_action_push_nsh),
[OVS_ACTION_ATTR_POP_NSH] = 0,
- [OVS_ACTION_ATTR_PUSH_ETH] = sizeof(struct ovs_action_push_eth),
- [OVS_ACTION_ATTR_POP_ETH] = 0,
[OVS_ACTION_ATTR_SET] = (u32)-1,
[OVS_ACTION_ATTR_SET_MASKED] = (u32)-1,
[OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
@@ -2301,8 +2281,6 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
case OVS_ACTION_ATTR_PUSH_NSH:
case OVS_ACTION_ATTR_POP_NSH:
- case OVS_ACTION_ATTR_PUSH_ETH:
- case OVS_ACTION_ATTR_POP_ETH:
break;
case OVS_ACTION_ATTR_POP_VLAN:
diff --git a/datapath/linux/compat/include/linux/openvswitch.h b/datapath/linux/compat/include/linux/openvswitch.h
index 187bb9b..bf1be4e 100644
--- a/datapath/linux/compat/include/linux/openvswitch.h
+++ b/datapath/linux/compat/include/linux/openvswitch.h
@@ -331,7 +331,6 @@ enum ovs_key_attr {
OVS_KEY_ATTR_IN_PORT, /* u32 OVS dp port number */
OVS_KEY_ATTR_NSH, /* struct ovs_key_nsh. Only support NSH MD
type 1 now */
- OVS_KEY_ATTR_ENCAP_ETH, /* struct ovs_key_encap_eth */
OVS_KEY_ATTR_ETHERNET, /* struct ovs_key_ethernet */
OVS_KEY_ATTR_VLAN, /* be16 VLAN TCI */
OVS_KEY_ATTR_ETHERTYPE, /* be16 Ethernet type */
@@ -406,6 +405,10 @@ enum ovs_frag_type {
#define OVS_FRAG_TYPE_MAX (__OVS_FRAG_TYPE_MAX - 1)
struct ovs_key_nsh {
+ __u8 encap_eth_dst[ETH_ALEN];
+ __u8 encap_eth_src[ETH_ALEN];
+ __u16 encap_eth_type;
+ __u16 pad1;
__u32 nshc1;
__u32 nshc2;
__u32 nshc3;
@@ -414,14 +417,8 @@ struct ovs_key_nsh {
__u8 nsi;
__u8 nsh_mdtype;
__u8 nsh_np;
- __u8 reserved;
-};
-
-struct ovs_key_encap_eth {
- __u8 encap_eth_src[ETH_ALEN];
- __u8 encap_eth_dst[ETH_ALEN];
- __u16 encap_eth_type;
-};
+ __u8 pad2;
+} __packed;
struct ovs_key_ethernet {
__u8 eth_src[ETH_ALEN];
@@ -652,6 +649,85 @@ struct ovs_action_push_vlan {
__be16 vlan_tci; /* 802.1Q TCI (VLAN ID and priority). */
};
+#ifndef __VXLAN_GPE_HEADER
+#define __VXLAN_GPE_HEADER 1
+
+/*
+ * VXLAN Generic Protocol Extension:
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |R|R|Ver|I|P|R|O|R|R|R|R|R|R|R|R|R|R|R|R|R|R|R|R| Next Proto |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | VXLAN Network Identifier (VNI) | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * Ver = Version. Indicates VXLAN GPE protocol version. The initial
+ * version is 0. If a receiver does not support the version
+ * indicated it MUST drop the packet.
+ *
+ * I = Instance Bit. The I bit MUST be set to indicate a valid VNI.
+ *
+ * P = Next Protocol Bit. The P bit is set to indicate that the
+ * Next Protocol field is present.
+ *
+ * O = OAM Flag Bit. The O bit is set to indicate that the packet
+ * is an OAM packet.
+ *
+ * Next Protocol = This 8 bit field indicates the protocol header
+ * immediately following the VXLAN GPE header.
+ *
+ * [1] https://www.ietf.org/id/draft-ietf-nvo3-vxlan-gpe-01.txt
+ */
+
+struct vxlanhdr_gpe {
+#ifdef __LITTLE_ENDIAN_BITFIELD
+ uint8_t oam_flag:1;
+ uint8_t reserved_flags1:1;
+ uint8_t np_applied:1;
+ uint8_t instance_applied:1;
+ uint8_t gpe_version:2;
+ uint8_t reserved_flags2:2;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ uint8_t reserved_flags2:2;
+ uint8_t gpe_version:2;
+ uint8_t instance_applied:1;
+ uint8_t np_applied:1;
+ uint8_t reserved_flags1:1;
+ uint8_t oam_flag:1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ uint8_t reserved_flags3;
+ uint8_t reserved_flags4;
+ uint8_t next_proto;
+ __be32 vx_vni;
+};
+
+/* VxLAN-GPE Header Next Protocol */
+#define VXLAN_GPE_NP_IPV4 0x01
+#define VXLAN_GPE_NP_IPV6 0x02
+#define VXLAN_GPE_NP_ETHERNET 0x03
+#define VXLAN_GPE_NP_NSH 0x04
+
+/* skb->mark mapping
+ *
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |R|R|Ver|I|P|R|O|R|R|R|R|R|R|R|R|R|R|R|R|R|R|R|R| Next Proto |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#define VXLAN_GPE_OAM_FLAG (1UL << 24)
+#define VXLAN_GPE_NP_APPLIED (1UL << 26)
+#define VXLAN_GPE_INSTANCE_APPLIED (1UL << 27)
+#define VXLAN_GPE_VERSION ((1UL << 28) | (1UL << 29))
+
+#define VXLAN_GPE_NP_MASK (0xFF)
+#define VXLAN_GPE_USED_BITS (VXLAN_GPE_OAM_FLAG | VXLAN_GPE_NP_APPLIED \
+ | VXLAN_GPE_INSTANCE_APPLIED | VXLAN_GPE_VERSION | 0xFF)
+
+#define VXLAN_F_GPE 0x4000
+#define VXLAN_HF_GPE 0x04000000
+
+#endif /* __VXLAN_GPE_HEADER */
+
/*
* Network Service Header:
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -769,6 +845,7 @@ struct nsh_hdr {
#define ENCAP_ETH_LEN 14
+#define ETH_NSH_TYPE1_HEADER_SIZE (NSH_PUSH_TYPE1_HEADER_SIZE + ENCAP_ETH_LEN)
/**
* struct encap_eth - encap ethernet header for ethernet NSH
* @encap_eth_src: encap ethernet source address.
@@ -781,6 +858,11 @@ struct encap_eth_hdr {
__u16 encap_eth_type;
};
+struct eth_nsh_hdr {
+ struct encap_eth_hdr encap_eth_header;
+ struct nsh_hdr nsh_hdr __attribute__((packed));
+};
+
#define ENCAP_ETH_PUSH_HEADER_SIZE 14
/**
* struct ovs_action_push_nsh - %OVS_ACTION_ATTR_PUSH_NSH action argument.
@@ -791,15 +873,6 @@ struct ovs_action_push_nsh {
uint8_t header[NSH_PUSH_HEADER_SIZE];
};
-/**
- * struct ovs_action_push_nsh - %OVS_ACTION_ATTR_PUSH_NSH action argument.
- * @header
- */
-struct ovs_action_push_eth {
- uint16_t encap_eth_type;
- uint8_t header[ENCAP_ETH_PUSH_HEADER_SIZE];
-};
-
/* Data path hash algorithm for computing Datapath hash.
*
* The algorithm type only specifies the fields in a flow
@@ -839,6 +912,7 @@ struct ovs_action_push_tnl {
uint32_t out_port;
uint32_t header_len;
uint32_t tnl_type; /* For logging. */
+ uint32_t exts;
uint8_t header[TNL_PUSH_HEADER_SIZE];
};
#endif
@@ -965,8 +1039,6 @@ enum ovs_action_attr {
OVS_ACTION_ATTR_POP_VLAN, /* No argument. */
OVS_ACTION_ATTR_PUSH_NSH, /* struct ovs_action_push_nsh. */
OVS_ACTION_ATTR_POP_NSH, /* No argument. */
- OVS_ACTION_ATTR_PUSH_ETH, /* struct ovs_action_push_eth. */
- OVS_ACTION_ATTR_POP_ETH, /* No argument. */
OVS_ACTION_ATTR_SAMPLE, /* Nested OVS_SAMPLE_ATTR_*. */
OVS_ACTION_ATTR_RECIRC, /* u32 recirc_id. */
OVS_ACTION_ATTR_HASH, /* struct ovs_action_hash. */
diff --git a/datapath/linux/compat/include/net/vxlan.h b/datapath/linux/compat/include/net/vxlan.h
index 3aeac88..31f9e5e 100644
--- a/datapath/linux/compat/include/net/vxlan.h
+++ b/datapath/linux/compat/include/net/vxlan.h
@@ -84,6 +84,8 @@ struct vxlanhdr_gbp {
#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
#define VXLAN_GBP_ID_MASK (0xFFFF)
+#ifndef __VXLAN_GPE_HEADER
+#define __VXLAN_GPE_HEADER 1
/*
* VXLAN Generic Protocol Extension:
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -156,6 +158,11 @@ struct vxlanhdr_gpe {
#define VXLAN_GPE_USED_BITS (VXLAN_GPE_OAM_FLAG | VXLAN_GPE_NP_APPLIED \
| VXLAN_GPE_INSTANCE_APPLIED | VXLAN_GPE_VERSION | 0xFF)
+#define VXLAN_HF_GPE BIT(26)
+#define VXLAN_F_GPE 0x4000
+
+#endif /* __VXLAN_GPE_HEADER */
+
/* VXLAN protocol header:
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |G|R|R|R|I|R|R|C| Reserved |
@@ -176,7 +183,6 @@ struct vxlanhdr {
#define VXLAN_HF_RCO BIT(21)
#define VXLAN_HF_VNI BIT(27)
#define VXLAN_HF_GBP BIT(31)
-#define VXLAN_HF_GPE BIT(26)
/* Remote checksum offload header option */
#define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */
@@ -279,7 +285,6 @@ struct vxlan_dev {
#define VXLAN_F_GBP 0x800
#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
#define VXLAN_F_COLLECT_METADATA 0x2000
-#define VXLAN_F_GPE 0x4000
/* Flags that are used in the receive path. These flags must match in
* order for a socket to be shareable
diff --git a/datapath/linux/compat/vxlan.c b/datapath/linux/compat/vxlan.c
index 7ef051c..888d431 100644
--- a/datapath/linux/compat/vxlan.c
+++ b/datapath/linux/compat/vxlan.c
@@ -821,6 +821,7 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
struct vxlan_dev *vxlan;
struct pcpu_sw_netstats *stats;
union vxlan_addr saddr;
+ struct eth_nsh_hdr *eth_nsh_header = NULL;
int err = 0;
/* For flow based devices, map all packets to VNI 0 */
@@ -888,6 +889,15 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
stats->rx_packets++;
stats->rx_bytes += skb->len;
u64_stats_update_end(&stats->syncp);
+
+ /* Add a faked encap_eth_header for NSH */
+ if (md && ((md->gpe & VXLAN_GPE_NP_MASK) == VXLAN_GPE_NP_NSH)) {
+ skb_push(skb, ENCAP_ETH_LEN);
+ eth_nsh_header = (struct eth_nsh_hdr *)skb->data;
+ memmove(eth_nsh_header->encap_eth_header.encap_eth_dst, skb_mac_header(skb), ENCAP_ETH_LEN);
+ eth_nsh_header->encap_eth_header.encap_eth_type = htons(ETH_P_NSH);
+ }
+
netdev_port_receive(skb, skb_tunnel_info(skb));
return;
drop:
@@ -1178,6 +1188,11 @@ static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *sk
}
}
+ /* Skip encap_eth_header on sending Eth+NSH to vxlan-gpe port */
+ if (md && ((md->gpe & VXLAN_GPE_NP_MASK) == VXLAN_GPE_NP_NSH)) {
+ skb_pull(skb, ENCAP_ETH_LEN);
+ }
+
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ VXLAN_HLEN + sizeof(struct iphdr)
+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 8e67bfd..d40cae4 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -467,7 +467,7 @@ static int get_port_by_name(struct dp_netdev *dp, const char *devname,
static void dp_netdev_free(struct dp_netdev *)
OVS_REQUIRES(dp_netdev_mutex);
static int do_add_port(struct dp_netdev *dp, const char *devname,
- const char *type, odp_port_t port_no)
+ const char *type, odp_port_t port_no, uint32_t exts)
OVS_REQUIRES(dp->port_mutex);
static void do_del_port(struct dp_netdev *dp, struct dp_netdev_port *)
OVS_REQUIRES(dp->port_mutex);
@@ -914,7 +914,7 @@ create_dp_netdev(const char *name, const struct dpif_class *class,
dp_netdev_set_nonpmd(dp);
ovs_mutex_lock(&dp->port_mutex);
- error = do_add_port(dp, name, "internal", ODPP_LOCAL);
+ error = do_add_port(dp, name, "internal", ODPP_LOCAL, 0);
ovs_mutex_unlock(&dp->port_mutex);
if (error) {
dp_netdev_free(dp);
@@ -1096,9 +1096,21 @@ hash_port_no(odp_port_t port_no)
return hash_int(odp_to_u32(port_no), 0);
}
+static void add_vxlan_gpe_exts(struct netdev *netdev, uint32_t exts)
+{
+ const char *type = netdev_get_type(netdev);
+ if (!strcmp(type, "vxlan")) {
+ struct netdev_tunnel_config *cfg;
+ cfg = netdev_get_tunnel_config(netdev);
+
+ if(exts & (1 << OVS_VXLAN_EXT_GPE))
+ cfg->exts |= (1 << OVS_VXLAN_EXT_GPE);
+ }
+}
+
static int
do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
- odp_port_t port_no)
+ odp_port_t port_no, uint32_t exts)
OVS_REQUIRES(dp->port_mutex)
{
struct netdev_saved_flags *sf;
@@ -1145,7 +1157,8 @@ do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
VLOG_ERR("%s, cannot set multiq", devname);
return errno;
}
- }
+ }
+ add_vxlan_gpe_exts(netdev, exts);
port = xzalloc(sizeof *port);
port->port_no = port_no;
port->netdev = netdev;
@@ -1211,7 +1224,12 @@ dpif_netdev_port_add(struct dpif *dpif, struct netdev *netdev,
}
if (!error) {
*port_nop = port_no;
- error = do_add_port(dp, dpif_port, netdev_get_type(netdev), port_no);
+ const struct netdev_tunnel_config *cfg;
+ uint32_t exts = 0;
+ cfg = netdev_get_tunnel_config(netdev);
+ if (cfg)
+ exts = cfg->exts;
+ error = do_add_port(dp, dpif_port, netdev_get_type(netdev), port_no, exts);
}
ovs_mutex_unlock(&dp->port_mutex);
@@ -3876,8 +3894,6 @@ dp_execute_cb(void *aux_, struct dp_packet **packets, int cnt,
case OVS_ACTION_ATTR_PUSH_NSH:
case OVS_ACTION_ATTR_POP_NSH:
- case OVS_ACTION_ATTR_PUSH_ETH:
- case OVS_ACTION_ATTR_POP_ETH:
case OVS_ACTION_ATTR_PUSH_VLAN:
case OVS_ACTION_ATTR_POP_VLAN:
case OVS_ACTION_ATTR_PUSH_MPLS:
diff --git a/lib/dpif.c b/lib/dpif.c
index b5265c4..481f0f9 100644
--- a/lib/dpif.c
+++ b/lib/dpif.c
@@ -1141,8 +1141,6 @@ dpif_execute_helper_cb(void *aux_, struct dp_packet **packets, int cnt,
case OVS_ACTION_ATTR_HASH:
case OVS_ACTION_ATTR_PUSH_NSH:
case OVS_ACTION_ATTR_POP_NSH:
- case OVS_ACTION_ATTR_PUSH_ETH:
- case OVS_ACTION_ATTR_POP_ETH:
case OVS_ACTION_ATTR_PUSH_VLAN:
case OVS_ACTION_ATTR_POP_VLAN:
case OVS_ACTION_ATTR_PUSH_MPLS:
diff --git a/lib/flow.c b/lib/flow.c
index fc8b98c..887b023 100644
--- a/lib/flow.c
+++ b/lib/flow.c
@@ -470,6 +470,25 @@ flow_extract(struct dp_packet *packet, struct flow *flow)
miniflow_expand(&m.mf, flow);
}
+/* parse Ethernet+NSH */
+static int parse_nsh(const void *data, struct ovs_key_nsh *nsh)
+{
+ memcpy(&nsh->encap_eth_dst, data, ENCAP_ETH_LEN);
+ const struct nsh_hdr *nsh_hdr = (const struct nsh_hdr *)((const char *)data + ENCAP_ETH_LEN);
+
+ nsh->nsh_mdtype = nsh_hdr->base.mdtype;
+ if (nsh->nsh_mdtype != NSH_M_TYPE1)
+ return -1;
+ nsh->nsh_np = nsh_hdr->base.proto;
+ nsh->nsi = nsh_hdr->base.svc_idx;
+ nsh->nsp = nsh_hdr->base.path_hdr << 8;
+ nsh->nshc1 = nsh_hdr->ctx.nshc1;
+ nsh->nshc2 = nsh_hdr->ctx.nshc2;
+ nsh->nshc3 = nsh_hdr->ctx.nshc3;
+ nsh->nshc4 = nsh_hdr->ctx.nshc4;
+ return 0;
+}
+
/* Caller is responsible for initializing 'dst' with enough storage for
* FLOW_U64S * 8 bytes. */
void
@@ -530,6 +549,32 @@ miniflow_extract(struct dp_packet *packet, struct miniflow *dst)
}
}
+ /* Extract Etherenet + NSH if the Ethernet type is 0x894F in packet */
+ if (OVS_UNLIKELY(size < sizeof(struct eth_header)))
+ goto out;
+ else {
+ const struct eth_header *eth = data;
+ if (eth->eth_type == htons(ETH_P_NSH)) {
+ /* extract Ethernet+nsh */
+ struct ovs_key_nsh nsh;
+ if (OVS_UNLIKELY(parse_nsh(data, &nsh)))
+ goto out;
+
+ /* Now only support NSH mdtype 1 */
+ if (nsh.nsh_mdtype == NSH_M_TYPE1){
+ /* Push all field related with Ethernet+nsh at once. */
+ miniflow_push_words(mf, encap_eth_dst, &nsh,
+ (sizeof (struct ovs_key_nsh)+sizeof(uint64_t) - 1) /
+ sizeof(uint64_t));
+ data = (const char *)data + NSH_M_TYPE1_LEN + ENCAP_ETH_LEN;
+ } else
+ goto out;
+
+ if(nsh.nsh_np != NSH_P_ETHERNET)
+ goto out;
+ }
+ }
+
/* Initialize packet's layer pointer and offsets. */
l2 = data;
dp_packet_reset_offsets(packet);
@@ -1291,6 +1336,9 @@ void flow_wildcards_init_for_packet(struct flow_wildcards *wc,
/* NSH fields wildcarded */
if (flow->nsh_mdtype) {
+ WC_MASK_FIELD(wc, encap_eth_src);
+ WC_MASK_FIELD(wc, encap_eth_dst);
+ WC_MASK_FIELD(wc, encap_eth_type);
WC_MASK_FIELD(wc, nshc1);
WC_MASK_FIELD(wc, nshc2);
WC_MASK_FIELD(wc, nshc3);
@@ -1301,13 +1349,6 @@ void flow_wildcards_init_for_packet(struct flow_wildcards *wc,
WC_MASK_FIELD(wc, nsi);
}
- /* ENCAP Eth wildcarded */
- if (flow->encap_eth_type) {
- WC_MASK_FIELD(wc, encap_eth_src);
- WC_MASK_FIELD(wc, encap_eth_dst);
- WC_MASK_FIELD(wc, encap_eth_type);
- }
-
/* metadata, regs, and conj_id wildcarded. */
WC_MASK_FIELD(wc, skb_priority);
@@ -1424,6 +1465,19 @@ flow_wc_map(const struct flow *flow, struct flowmap *map)
FLOWMAP_SET(map, ct_mark);
FLOWMAP_SET(map, ct_label);
+ /* NSH fields */
+ FLOWMAP_SET(map, encap_eth_src);
+ FLOWMAP_SET(map, encap_eth_dst);
+ FLOWMAP_SET(map, encap_eth_type);
+ FLOWMAP_SET(map, nshc1);
+ FLOWMAP_SET(map, nshc2);
+ FLOWMAP_SET(map, nshc3);
+ FLOWMAP_SET(map, nshc4);
+ FLOWMAP_SET(map, nsp);
+ FLOWMAP_SET(map, nsi);
+ FLOWMAP_SET(map, nsh_mdtype);
+ FLOWMAP_SET(map, nsh_np);
+
/* Ethertype-dependent fields. */
if (OVS_LIKELY(flow->dl_type == htons(ETH_TYPE_IP))) {
FLOWMAP_SET(map, nw_src);
@@ -2271,6 +2325,33 @@ flow_compose_l4(struct dp_packet *p, const struct flow *flow)
return l4_len;
}
+/* push ethernet+nsh header at the beginning of packets */
+static void
+flow_compose_nsh(struct dp_packet *p, const struct flow *flow)
+{
+ struct eth_nsh_hdr *eth_nsh_header;
+
+ /* Now only support mdtype1 */
+ if (flow->nsh_mdtype != NSH_M_TYPE1)
+ return;
+
+ eth_nsh_header = dp_packet_push_uninit(p, ETH_NSH_TYPE1_HEADER_SIZE);
+ eth_nsh_header->encap_eth_header.encap_eth_dst = flow->encap_eth_dst;
+ eth_nsh_header->encap_eth_header.encap_eth_src = flow->encap_eth_src;
+ eth_nsh_header->encap_eth_header.encap_eth_type = htons(ETH_P_NSH);
+
+ memset(ð_nsh_header->nsh_hdr, 0, sizeof (struct nsh_hdr));
+ eth_nsh_header->nsh_hdr.base.length = 6;
+ eth_nsh_header->nsh_hdr.base.proto = flow->nsh_np;
+ eth_nsh_header->nsh_hdr.base.mdtype = flow->nsh_mdtype;
+ eth_nsh_header->nsh_hdr.base.proto = flow->nsh_np;
+ eth_nsh_header->nsh_hdr.base.path_hdr = flow->nsp >> 8 | flow->nsi << 24;
+ eth_nsh_header->nsh_hdr.ctx.nshc1 = flow->nshc1;
+ eth_nsh_header->nsh_hdr.ctx.nshc2 = flow->nshc2;
+ eth_nsh_header->nsh_hdr.ctx.nshc3 = flow->nshc3;
+ eth_nsh_header->nsh_hdr.ctx.nshc4 = flow->nshc4;
+}
+
/* Puts into 'b' a packet that flow_extract() would parse as having the given
* 'flow'.
*
@@ -2371,6 +2452,10 @@ flow_compose(struct dp_packet *p, const struct flow *flow)
push_mpls(p, flow->dl_type, flow->mpls_lse[--n]);
}
}
+
+ if (flow->nsh_mdtype) {
+ flow_compose_nsh(p, flow);
+ }
}
/* Compressed flow. */
diff --git a/lib/flow.h b/lib/flow.h
index a8677b1..31a2a16 100644
--- a/lib/flow.h
+++ b/lib/flow.h
@@ -111,7 +111,11 @@ struct flow {
ofp_port_t actset_output; /* Output port in action set. */
uint8_t pad2[2]; /* Pad to 64 bits. */
- /* NSH (64-bit aligned) */
+ /* ETH + NSH (64-bit aligned) */
+ struct eth_addr encap_eth_dst; /* Encap ethernet destination address. */
+ struct eth_addr encap_eth_src; /* Encap ethernet source address. */
+ ovs_be16 encap_eth_type; /* Encap ethernet frame type. */
+ uint8_t pad3[2]; /* Pad to 64 bits. */
ovs_be32 nshc1;
ovs_be32 nshc2;
ovs_be32 nshc3;
@@ -120,13 +124,7 @@ struct flow {
uint8_t nsi;
uint8_t nsh_mdtype;
uint8_t nsh_np;
- uint8_t pad3;
-
- /* ENCAP_ETH (64-bit aligned) */
- struct eth_addr encap_eth_src; /* Encap ethernet source address. */
- struct eth_addr encap_eth_dst; /* Encap ethernet destination address. */
- ovs_be16 encap_eth_type; /* Encap ethernet frame type. */
- uint8_t pad4[2];
+ uint8_t pad4;
/* L2, Order the same as in the Ethernet header! (64-bit aligned) */
struct eth_addr dl_dst; /* Ethernet destination address. */
diff --git a/lib/match.c b/lib/match.c
index 3db2a2b..2b6648d 100644
--- a/lib/match.c
+++ b/lib/match.c
@@ -1002,12 +1002,12 @@ match_set_encap_eth_dst(struct match *match, const struct eth_addr encap_eth_dst
}
void
-match_set_encap_eth_type(struct match *match, uint16_t encap_eth_type)
+match_set_encap_eth_type(struct match *match, ovs_be16 encap_eth_type)
{
- match_set_encap_eth_type_masked(match, encap_eth_type, UINT16_MAX);
+ match->wc.masks.encap_eth_type = OVS_BE16_MAX;
+ match->flow.encap_eth_type = encap_eth_type;
}
-
/* Returns true if 'a' and 'b' wildcard the same fields and have the same
* values for fixed fields, otherwise false. */
bool
@@ -1338,12 +1338,11 @@ match_format(const struct match *match, struct ds *s, int priority)
wc->masks.nshc4);
}
- if (wc->masks.encap_eth_type) {
- ds_put_format(s, "encap_eth_type=%"PRIu16",", f->encap_eth_type);
- }
-
format_eth_masked(s, "encap_eth_src", f->encap_eth_src, wc->masks.encap_eth_src);
format_eth_masked(s, "encap_eth_dst", f->encap_eth_dst, wc->masks.encap_eth_dst);
+ if (wc->masks.encap_eth_type) {
+ ds_put_format(s, "encap_eth_type=0x%04"PRIx16",", ntohs(f->encap_eth_type));
+ }
if (wc->masks.dl_type) {
skip_type = true;
diff --git a/lib/match.h b/lib/match.h
index 529350e..bf27d38 100644
--- a/lib/match.h
+++ b/lib/match.h
@@ -187,7 +187,7 @@ void match_set_nshc3(struct match *, ovs_be32 nshc3);
void match_set_nshc4(struct match *, ovs_be32 nshc4);
void match_set_encap_eth_src(struct match *match, const struct eth_addr encap_eth_src);
void match_set_encap_eth_dst(struct match *match, const struct eth_addr encap_eth_dst);
-void match_set_encap_eth_type(struct match *match, uint16_t encap_eth_type);
+void match_set_encap_eth_type(struct match *match, ovs_be16 encap_eth_type);
bool match_equal(const struct match *, const struct match *);
uint32_t match_hash(const struct match *, uint32_t basis);