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Commit fff06c36 authored by Pravin B Shelar's avatar Pravin B Shelar
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openvswitch: Optimize recirc action. 

OVS need to flow key for flow lookup in recic action. OVS
does key extract in recic action. Most of cases we could
use OVS_CB packet key directly and can avoid packet flow key
extract. SET action we can update flow-key along with packet
to keep it consistent. But there are some action like MPLS
pop which forces OVS to do flow-extract. In such cases we
can mark flow key as invalid so that subsequent recirc
action can do full flow extract.
Signed-off-by: default avatarPravin B Shelar <pshelar@nicira.com>
Acked-by: default avatarJarno Rajahalme <jrajahalme@nicira.com>
Acked-by: default avatarAndy Zhou <azhou@nicira.com>
parent 8f0aad6f
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Inline Side-by-side
Showing with 106 additions and 45 deletions
net/openvswitch/actions.c
View file @ fff06c36
......@@ -109,6 +109,16 @@ static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
return da;
}
static void invalidate_flow_key(struct sw_flow_key *key)
{
key->eth.type = htons(0);
}
static bool is_flow_key_valid(const struct sw_flow_key *key)
{
return !!key->eth.type;
}
static int make_writable(struct sk_buff *skb, int write_len)
{
if (!pskb_may_pull(skb, write_len))
......@@ -120,7 +130,7 @@ static int make_writable(struct sk_buff *skb, int write_len)
return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
}
static int push_mpls(struct sk_buff *skb,
static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_action_push_mpls *mpls)
{
__be32 *new_mpls_lse;
......@@ -151,10 +161,12 @@ static int push_mpls(struct sk_buff *skb,
skb_set_inner_protocol(skb, skb->protocol);
skb->protocol = mpls->mpls_ethertype;
invalidate_flow_key(key);
return 0;
}
static int pop_mpls(struct sk_buff *skb, const __be16 ethertype)
static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
const __be16 ethertype)
{
struct ethhdr *hdr;
int err;
......@@ -181,10 +193,13 @@ static int pop_mpls(struct sk_buff *skb, const __be16 ethertype)
hdr->h_proto = ethertype;
if (eth_p_mpls(skb->protocol))
skb->protocol = ethertype;
invalidate_flow_key(key);
return 0;
}
static int set_mpls(struct sk_buff *skb, const __be32 *mpls_lse)
static int set_mpls(struct sk_buff *skb, struct sw_flow_key *key,
const __be32 *mpls_lse)
{
__be32 *stack;
int err;
......@@ -196,13 +211,12 @@ static int set_mpls(struct sk_buff *skb, const __be32 *mpls_lse)
stack = (__be32 *)skb_mpls_header(skb);
if (skb->ip_summed == CHECKSUM_COMPLETE) {
__be32 diff[] = { ~(*stack), *mpls_lse };
skb->csum = ~csum_partial((char *)diff, sizeof(diff),
~skb->csum);
}
*stack = *mpls_lse;
key->mpls.top_lse = *mpls_lse;
return 0;
}
......@@ -237,7 +251,7 @@ static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
return 0;
}
static int pop_vlan(struct sk_buff *skb)
static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
{
__be16 tci;
int err;
......@@ -255,9 +269,12 @@ static int pop_vlan(struct sk_buff *skb)
}
/* move next vlan tag to hw accel tag */
if (likely(skb->protocol != htons(ETH_P_8021Q) ||
skb->len < VLAN_ETH_HLEN))
skb->len < VLAN_ETH_HLEN)) {
key->eth.tci = 0;
return 0;
}
invalidate_flow_key(key);
err = __pop_vlan_tci(skb, &tci);
if (unlikely(err))
return err;
......@@ -266,7 +283,8 @@ static int pop_vlan(struct sk_buff *skb)
return 0;
}
static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_action_push_vlan *vlan)
{
if (unlikely(vlan_tx_tag_present(skb))) {
u16 current_tag;
......@@ -283,12 +301,15 @@ static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vla
skb->csum = csum_add(skb->csum, csum_partial(skb->data
+ (2 * ETH_ALEN), VLAN_HLEN, 0));
invalidate_flow_key(key);
} else {
key->eth.tci = vlan->vlan_tci;
}
__vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
return 0;
}
static int set_eth_addr(struct sk_buff *skb,
static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_ethernet *eth_key)
{
int err;
......@@ -303,11 +324,13 @@ static int set_eth_addr(struct sk_buff *skb,
ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
ether_addr_copy(key->eth.src, eth_key->eth_src);
ether_addr_copy(key->eth.dst, eth_key->eth_dst);
return 0;
}
static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
__be32 *addr, __be32 new_addr)
__be32 *addr, __be32 new_addr)
{
int transport_len = skb->len - skb_transport_offset(skb);
......@@ -386,7 +409,8 @@ static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)
nh->ttl = new_ttl;
}
static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_ipv4 *ipv4_key)
{
struct iphdr *nh;
int err;
......@@ -398,22 +422,31 @@ static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
nh = ip_hdr(skb);
if (ipv4_key->ipv4_src != nh->saddr)
if (ipv4_key->ipv4_src != nh->saddr) {
set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src);
key->ipv4.addr.src = ipv4_key->ipv4_src;
}
if (ipv4_key->ipv4_dst != nh->daddr)
if (ipv4_key->ipv4_dst != nh->daddr) {
set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst);
key->ipv4.addr.dst = ipv4_key->ipv4_dst;
}
if (ipv4_key->ipv4_tos != nh->tos)
if (ipv4_key->ipv4_tos != nh->tos) {
ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
key->ip.tos = nh->tos;
}
if (ipv4_key->ipv4_ttl != nh->ttl)
if (ipv4_key->ipv4_ttl != nh->ttl) {
set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
key->ip.ttl = ipv4_key->ipv4_ttl;
}
return 0;
}
static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_ipv6 *ipv6_key)
{
struct ipv6hdr *nh;
int err;
......@@ -429,9 +462,12 @@ static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
saddr = (__be32 *)&nh->saddr;
daddr = (__be32 *)&nh->daddr;
if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src)))
if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) {
set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr,
ipv6_key->ipv6_src, true);
memcpy(&key->ipv6.addr.src, ipv6_key->ipv6_src,
sizeof(ipv6_key->ipv6_src));
}
if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) {
unsigned int offset = 0;
......@@ -445,12 +481,18 @@ static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr,
ipv6_key->ipv6_dst, recalc_csum);
memcpy(&key->ipv6.addr.dst, ipv6_key->ipv6_dst,
sizeof(ipv6_key->ipv6_dst));
}
set_ipv6_tc(nh, ipv6_key->ipv6_tclass);
key->ip.tos = ipv6_get_dsfield(nh);
set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));
nh->hop_limit = ipv6_key->ipv6_hlimit;
key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
nh->hop_limit = ipv6_key->ipv6_hlimit;
key->ip.ttl = ipv6_key->ipv6_hlimit;
return 0;
}
......@@ -478,7 +520,8 @@ static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port)
}
}
static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
static int set_udp(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_udp *udp_port_key)
{
struct udphdr *uh;
int err;
......@@ -489,16 +532,21 @@ static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
return err;
uh = udp_hdr(skb);
if (udp_port_key->udp_src != uh->source)
if (udp_port_key->udp_src != uh->source) {
set_udp_port(skb, &uh->source, udp_port_key->udp_src);
key->tp.src = udp_port_key->udp_src;
}
if (udp_port_key->udp_dst != uh->dest)
if (udp_port_key->udp_dst != uh->dest) {
set_udp_port(skb, &uh->dest, udp_port_key->udp_dst);
key->tp.dst = udp_port_key->udp_dst;
}
return 0;
}
static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
static int set_tcp(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_tcp *tcp_port_key)
{
struct tcphdr *th;
int err;
......@@ -509,17 +557,21 @@ static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
return err;
th = tcp_hdr(skb);
if (tcp_port_key->tcp_src != th->source)
if (tcp_port_key->tcp_src != th->source) {
set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check);
key->tp.src = tcp_port_key->tcp_src;
}
if (tcp_port_key->tcp_dst != th->dest)
if (tcp_port_key->tcp_dst != th->dest) {
set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check);
key->tp.dst = tcp_port_key->tcp_dst;
}
return 0;
}
static int set_sctp(struct sk_buff *skb,
const struct ovs_key_sctp *sctp_port_key)
static int set_sctp(struct sk_buff *skb, struct sw_flow_key *key,
const struct ovs_key_sctp *sctp_port_key)
{
struct sctphdr *sh;
int err;
......@@ -546,6 +598,8 @@ static int set_sctp(struct sk_buff *skb,
sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
skb_clear_hash(skb);
key->tp.src = sctp_port_key->sctp_src;
key->tp.dst = sctp_port_key->sctp_dst;
}
return 0;
......@@ -675,18 +729,20 @@ static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
key->ovs_flow_hash = hash;
}
static int execute_set_action(struct sk_buff *skb,
const struct nlattr *nested_attr)
static int execute_set_action(struct sk_buff *skb, struct sw_flow_key *key,
const struct nlattr *nested_attr)
{
int err = 0;
switch (nla_type(nested_attr)) {
case OVS_KEY_ATTR_PRIORITY:
skb->priority = nla_get_u32(nested_attr);
key->phy.priority = skb->priority;
break;
case OVS_KEY_ATTR_SKB_MARK:
skb->mark = nla_get_u32(nested_attr);
key->phy.skb_mark = skb->mark;
break;
case OVS_KEY_ATTR_TUNNEL_INFO:
......@@ -694,31 +750,31 @@ static int execute_set_action(struct sk_buff *skb,
break;
case OVS_KEY_ATTR_ETHERNET:
err = set_eth_addr(skb, nla_data(nested_attr));
err = set_eth_addr(skb, key, nla_data(nested_attr));
break;
case OVS_KEY_ATTR_IPV4:
err = set_ipv4(skb, nla_data(nested_attr));
err = set_ipv4(skb, key, nla_data(nested_attr));
break;
case OVS_KEY_ATTR_IPV6:
err = set_ipv6(skb, nla_data(nested_attr));
err = set_ipv6(skb, key, nla_data(nested_attr));
break;
case OVS_KEY_ATTR_TCP:
err = set_tcp(skb, nla_data(nested_attr));
err = set_tcp(skb, key, nla_data(nested_attr));
break;
case OVS_KEY_ATTR_UDP:
err = set_udp(skb, nla_data(nested_attr));
err = set_udp(skb, key, nla_data(nested_attr));
break;
case OVS_KEY_ATTR_SCTP:
err = set_sctp(skb, nla_data(nested_attr));
err = set_sctp(skb, key, nla_data(nested_attr));
break;
case OVS_KEY_ATTR_MPLS:
err = set_mpls(skb, nla_data(nested_attr));
err = set_mpls(skb, key, nla_data(nested_attr));
break;
}
......@@ -730,11 +786,15 @@ static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
const struct nlattr *a, int rem)
{
struct deferred_action *da;
int err;
err = ovs_flow_key_update(skb, key);
if (err)
return err;
if (!is_flow_key_valid(key)) {
int err;
err = ovs_flow_key_update(skb, key);
if (err)
return err;
}
BUG_ON(!is_flow_key_valid(key));
if (!nla_is_last(a, rem)) {
/* Recirc action is the not the last action
......@@ -771,7 +831,8 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
/* Every output action needs a separate clone of 'skb', but the common
* case is just a single output action, so that doing a clone and
* then freeing the original skbuff is wasteful. So the following code
* is slightly obscure just to avoid that. */
* is slightly obscure just to avoid that.
*/
int prev_port = -1;
const struct nlattr *a;
int rem;
......@@ -803,21 +864,21 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
break;
case OVS_ACTION_ATTR_PUSH_MPLS:
err = push_mpls(skb, nla_data(a));
err = push_mpls(skb, key, nla_data(a));
break;
case OVS_ACTION_ATTR_POP_MPLS:
err = pop_mpls(skb, nla_get_be16(a));
err = pop_mpls(skb, key, nla_get_be16(a));
break;
case OVS_ACTION_ATTR_PUSH_VLAN:
err = push_vlan(skb, nla_data(a));
err = push_vlan(skb, key, nla_data(a));
if (unlikely(err)) /* skb already freed. */
return err;
break;
case OVS_ACTION_ATTR_POP_VLAN:
err = pop_vlan(skb);
err = pop_vlan(skb, key);
break;
case OVS_ACTION_ATTR_RECIRC:
......@@ -832,7 +893,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
break;
case OVS_ACTION_ATTR_SET:
err = execute_set_action(skb, nla_data(a));
err = execute_set_action(skb, key, nla_data(a));
break;
case OVS_ACTION_ATTR_SAMPLE:
......
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