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 <pshelar@nicira.com> Acked-by: Jarno Rajahalme <jrajahalme@nicira.com> Acked-by: Andy Zhou <azhou@nicira.com>
This commit is contained in:
Pravin B Shelar
parent
8f0aad6f35
commit
fff06c36a2
1 changed files with 107 additions and 46 deletions
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@ -109,6 +109,16 @@ static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
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return da;
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}
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static void invalidate_flow_key(struct sw_flow_key *key)
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{
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key->eth.type = htons(0);
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}
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static bool is_flow_key_valid(const struct sw_flow_key *key)
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{
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return !!key->eth.type;
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}
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static int make_writable(struct sk_buff *skb, int write_len)
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{
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if (!pskb_may_pull(skb, write_len))
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@ -120,7 +130,7 @@ static int make_writable(struct sk_buff *skb, int write_len)
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return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
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}
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static int push_mpls(struct sk_buff *skb,
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static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_action_push_mpls *mpls)
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{
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__be32 *new_mpls_lse;
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@ -151,10 +161,12 @@ static int push_mpls(struct sk_buff *skb,
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skb_set_inner_protocol(skb, skb->protocol);
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skb->protocol = mpls->mpls_ethertype;
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invalidate_flow_key(key);
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return 0;
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}
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static int pop_mpls(struct sk_buff *skb, const __be16 ethertype)
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static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
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const __be16 ethertype)
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{
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struct ethhdr *hdr;
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int err;
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@ -181,10 +193,13 @@ static int pop_mpls(struct sk_buff *skb, const __be16 ethertype)
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hdr->h_proto = ethertype;
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if (eth_p_mpls(skb->protocol))
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skb->protocol = ethertype;
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invalidate_flow_key(key);
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return 0;
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}
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static int set_mpls(struct sk_buff *skb, const __be32 *mpls_lse)
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static int set_mpls(struct sk_buff *skb, struct sw_flow_key *key,
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const __be32 *mpls_lse)
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{
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__be32 *stack;
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int err;
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@ -196,13 +211,12 @@ static int set_mpls(struct sk_buff *skb, const __be32 *mpls_lse)
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stack = (__be32 *)skb_mpls_header(skb);
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if (skb->ip_summed == CHECKSUM_COMPLETE) {
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__be32 diff[] = { ~(*stack), *mpls_lse };
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skb->csum = ~csum_partial((char *)diff, sizeof(diff),
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~skb->csum);
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}
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*stack = *mpls_lse;
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key->mpls.top_lse = *mpls_lse;
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return 0;
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}
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@ -237,7 +251,7 @@ static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
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return 0;
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}
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static int pop_vlan(struct sk_buff *skb)
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static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
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{
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__be16 tci;
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int err;
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@ -255,9 +269,12 @@ static int pop_vlan(struct sk_buff *skb)
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}
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/* move next vlan tag to hw accel tag */
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if (likely(skb->protocol != htons(ETH_P_8021Q) ||
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skb->len < VLAN_ETH_HLEN))
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skb->len < VLAN_ETH_HLEN)) {
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key->eth.tci = 0;
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return 0;
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}
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invalidate_flow_key(key);
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err = __pop_vlan_tci(skb, &tci);
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if (unlikely(err))
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return err;
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@ -266,7 +283,8 @@ static int pop_vlan(struct sk_buff *skb)
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return 0;
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}
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static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
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static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_action_push_vlan *vlan)
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{
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if (unlikely(vlan_tx_tag_present(skb))) {
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u16 current_tag;
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@ -283,12 +301,15 @@ static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vla
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skb->csum = csum_add(skb->csum, csum_partial(skb->data
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+ (2 * ETH_ALEN), VLAN_HLEN, 0));
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invalidate_flow_key(key);
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} else {
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key->eth.tci = vlan->vlan_tci;
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}
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__vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
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return 0;
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}
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static int set_eth_addr(struct sk_buff *skb,
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static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_ethernet *eth_key)
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{
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int err;
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@ -303,11 +324,13 @@ static int set_eth_addr(struct sk_buff *skb,
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ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
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ether_addr_copy(key->eth.src, eth_key->eth_src);
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ether_addr_copy(key->eth.dst, eth_key->eth_dst);
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return 0;
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}
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static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
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__be32 *addr, __be32 new_addr)
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__be32 *addr, __be32 new_addr)
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{
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int transport_len = skb->len - skb_transport_offset(skb);
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@ -386,7 +409,8 @@ static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)
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nh->ttl = new_ttl;
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}
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static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
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static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_ipv4 *ipv4_key)
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{
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struct iphdr *nh;
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int err;
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@ -398,22 +422,31 @@ static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
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nh = ip_hdr(skb);
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if (ipv4_key->ipv4_src != nh->saddr)
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if (ipv4_key->ipv4_src != nh->saddr) {
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set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src);
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key->ipv4.addr.src = ipv4_key->ipv4_src;
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}
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if (ipv4_key->ipv4_dst != nh->daddr)
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if (ipv4_key->ipv4_dst != nh->daddr) {
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set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst);
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key->ipv4.addr.dst = ipv4_key->ipv4_dst;
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}
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if (ipv4_key->ipv4_tos != nh->tos)
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if (ipv4_key->ipv4_tos != nh->tos) {
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ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
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key->ip.tos = nh->tos;
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}
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if (ipv4_key->ipv4_ttl != nh->ttl)
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if (ipv4_key->ipv4_ttl != nh->ttl) {
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set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
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key->ip.ttl = ipv4_key->ipv4_ttl;
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}
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return 0;
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}
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static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
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static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_ipv6 *ipv6_key)
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{
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struct ipv6hdr *nh;
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int err;
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@ -429,9 +462,12 @@ static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
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saddr = (__be32 *)&nh->saddr;
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daddr = (__be32 *)&nh->daddr;
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if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src)))
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if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) {
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set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr,
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ipv6_key->ipv6_src, true);
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memcpy(&key->ipv6.addr.src, ipv6_key->ipv6_src,
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sizeof(ipv6_key->ipv6_src));
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}
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if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) {
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unsigned int offset = 0;
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@ -445,12 +481,18 @@ static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
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set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr,
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ipv6_key->ipv6_dst, recalc_csum);
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memcpy(&key->ipv6.addr.dst, ipv6_key->ipv6_dst,
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sizeof(ipv6_key->ipv6_dst));
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}
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set_ipv6_tc(nh, ipv6_key->ipv6_tclass);
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set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));
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nh->hop_limit = ipv6_key->ipv6_hlimit;
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key->ip.tos = ipv6_get_dsfield(nh);
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set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));
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key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
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nh->hop_limit = ipv6_key->ipv6_hlimit;
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key->ip.ttl = ipv6_key->ipv6_hlimit;
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return 0;
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}
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@ -478,7 +520,8 @@ static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port)
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}
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}
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static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
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static int set_udp(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_udp *udp_port_key)
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{
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struct udphdr *uh;
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int err;
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@ -489,16 +532,21 @@ static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
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return err;
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uh = udp_hdr(skb);
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if (udp_port_key->udp_src != uh->source)
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if (udp_port_key->udp_src != uh->source) {
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set_udp_port(skb, &uh->source, udp_port_key->udp_src);
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key->tp.src = udp_port_key->udp_src;
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}
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if (udp_port_key->udp_dst != uh->dest)
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if (udp_port_key->udp_dst != uh->dest) {
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set_udp_port(skb, &uh->dest, udp_port_key->udp_dst);
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key->tp.dst = udp_port_key->udp_dst;
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}
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return 0;
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}
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static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
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static int set_tcp(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_tcp *tcp_port_key)
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{
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struct tcphdr *th;
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int err;
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@ -509,17 +557,21 @@ static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
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return err;
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th = tcp_hdr(skb);
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if (tcp_port_key->tcp_src != th->source)
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if (tcp_port_key->tcp_src != th->source) {
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set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check);
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key->tp.src = tcp_port_key->tcp_src;
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}
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if (tcp_port_key->tcp_dst != th->dest)
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if (tcp_port_key->tcp_dst != th->dest) {
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set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check);
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key->tp.dst = tcp_port_key->tcp_dst;
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}
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return 0;
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}
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static int set_sctp(struct sk_buff *skb,
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const struct ovs_key_sctp *sctp_port_key)
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static int set_sctp(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_sctp *sctp_port_key)
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{
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struct sctphdr *sh;
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int err;
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@ -546,6 +598,8 @@ static int set_sctp(struct sk_buff *skb,
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sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
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skb_clear_hash(skb);
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key->tp.src = sctp_port_key->sctp_src;
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key->tp.dst = sctp_port_key->sctp_dst;
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}
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return 0;
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@ -675,18 +729,20 @@ static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
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key->ovs_flow_hash = hash;
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}
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static int execute_set_action(struct sk_buff *skb,
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const struct nlattr *nested_attr)
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static int execute_set_action(struct sk_buff *skb, struct sw_flow_key *key,
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const struct nlattr *nested_attr)
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{
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int err = 0;
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switch (nla_type(nested_attr)) {
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case OVS_KEY_ATTR_PRIORITY:
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skb->priority = nla_get_u32(nested_attr);
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key->phy.priority = skb->priority;
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break;
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case OVS_KEY_ATTR_SKB_MARK:
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skb->mark = nla_get_u32(nested_attr);
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key->phy.skb_mark = skb->mark;
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break;
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case OVS_KEY_ATTR_TUNNEL_INFO:
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@ -694,31 +750,31 @@ static int execute_set_action(struct sk_buff *skb,
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break;
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case OVS_KEY_ATTR_ETHERNET:
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err = set_eth_addr(skb, nla_data(nested_attr));
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err = set_eth_addr(skb, key, nla_data(nested_attr));
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break;
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case OVS_KEY_ATTR_IPV4:
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err = set_ipv4(skb, nla_data(nested_attr));
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err = set_ipv4(skb, key, nla_data(nested_attr));
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break;
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case OVS_KEY_ATTR_IPV6:
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err = set_ipv6(skb, nla_data(nested_attr));
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err = set_ipv6(skb, key, nla_data(nested_attr));
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break;
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case OVS_KEY_ATTR_TCP:
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err = set_tcp(skb, nla_data(nested_attr));
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err = set_tcp(skb, key, nla_data(nested_attr));
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break;
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case OVS_KEY_ATTR_UDP:
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err = set_udp(skb, nla_data(nested_attr));
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err = set_udp(skb, key, nla_data(nested_attr));
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break;
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case OVS_KEY_ATTR_SCTP:
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err = set_sctp(skb, nla_data(nested_attr));
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err = set_sctp(skb, key, nla_data(nested_attr));
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break;
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case OVS_KEY_ATTR_MPLS:
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err = set_mpls(skb, nla_data(nested_attr));
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err = set_mpls(skb, key, nla_data(nested_attr));
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break;
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}
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@ -730,11 +786,15 @@ static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
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const struct nlattr *a, int rem)
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{
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struct deferred_action *da;
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int err;
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err = ovs_flow_key_update(skb, key);
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if (err)
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return err;
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if (!is_flow_key_valid(key)) {
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int err;
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err = ovs_flow_key_update(skb, key);
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if (err)
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return err;
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}
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BUG_ON(!is_flow_key_valid(key));
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if (!nla_is_last(a, rem)) {
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/* Recirc action is the not the last action
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@ -771,7 +831,8 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
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/* Every output action needs a separate clone of 'skb', but the common
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* case is just a single output action, so that doing a clone and
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* then freeing the original skbuff is wasteful. So the following code
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* is slightly obscure just to avoid that. */
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* is slightly obscure just to avoid that.
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*/
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int prev_port = -1;
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const struct nlattr *a;
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int rem;
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@ -803,21 +864,21 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
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break;
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case OVS_ACTION_ATTR_PUSH_MPLS:
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err = push_mpls(skb, nla_data(a));
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err = push_mpls(skb, key, nla_data(a));
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break;
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case OVS_ACTION_ATTR_POP_MPLS:
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err = pop_mpls(skb, nla_get_be16(a));
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err = pop_mpls(skb, key, nla_get_be16(a));
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break;
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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:
|
||||
|
|
|
|||
Loading…
Reference in a new issue