From fff06c36a2563214073707f6e6aea152713274d1 Mon Sep 17 00:00:00 2001 From: Pravin B Shelar Date: Thu, 6 Nov 2014 06:55:14 -0800 Subject: [PATCH] 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: Pravin B Shelar Acked-by: Jarno Rajahalme Acked-by: Andy Zhou --- net/openvswitch/actions.c | 151 ++++++++++++++++++++++++++++++++-------------- 1 file changed, 106 insertions(+), 45 deletions(-) diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index ceb618c..d4c2f73 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -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: -- 2.7.4