[ovs-dev] [PATCH v2] datapath: Optimize recirc action.

Andy Zhou azhou at nicira.com
Fri Aug 8 19:41:55 UTC 2014


The rest of the patch also looks good. Thanks for making the changes.

Acked-by: Andy Zhou <azhou at nicira.com>

On Thu, Aug 7, 2014 at 4:32 PM, Jarno Rajahalme <jrajahalme at nicira.com> wrote:
> I’ll let Andy review the recirculation part in the bottom. For set actions:
>
> Acked-by: Jarno Rajahalme <jrajahalme at nicira.com>
>
> On Aug 7, 2014, at 3:46 PM, Pravin B Shelar <pshelar at nicira.com> wrote:
>
>> 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 at nicira.com>
>> ---
>> Fixed sample action.
>> avoid extract in mpls set and vlan push for single vlan case.
>> refactor recirc execute.
>> update tos in ipv6 set.
>> ---
>> datapath/actions.c | 222 ++++++++++++++++++++++++++++++++++++++++++++---------
>> 1 file changed, 185 insertions(+), 37 deletions(-)
>>
>> diff --git a/datapath/actions.c b/datapath/actions.c
>> index efc64f1..4ca86f4 100644
>> --- a/datapath/actions.c
>> +++ b/datapath/actions.c
>> @@ -40,6 +40,95 @@
>> #include "vlan.h"
>> #include "vport.h"
>>
>> +static void flow_key_set_priority(struct sk_buff *skb, u32 priority)
>> +{
>> +     OVS_CB(skb)->pkt_key->phy.priority = priority;
>> +}
>> +
>> +static void flow_key_set_skb_mark(struct sk_buff *skb, u32 skb_mark)
>> +{
>> +     OVS_CB(skb)->pkt_key->phy.skb_mark = skb_mark;
>> +}
>> +
>> +static void flow_key_set_eth_src(struct sk_buff *skb, const u8 addr[])
>> +{
>> +     ether_addr_copy(OVS_CB(skb)->pkt_key->eth.src, addr);
>> +}
>> +
>> +static void flow_key_set_eth_dst(struct sk_buff *skb, const u8 addr[])
>> +{
>> +     ether_addr_copy(OVS_CB(skb)->pkt_key->eth.dst, addr);
>> +}
>> +
>> +static void flow_key_set_vlan_tci(struct sk_buff *skb, __be16 tci)
>> +{
>> +     OVS_CB(skb)->pkt_key->eth.tci = tci;
>> +}
>> +
>> +static void flow_key_set_mpls_top_lse(struct sk_buff *skb, __be32 top_lse)
>> +{
>> +     OVS_CB(skb)->pkt_key->mpls.top_lse = top_lse;
>> +}
>> +
>> +static void flow_key_set_ipv4_src(struct sk_buff *skb, __be32 addr)
>> +{
>> +     OVS_CB(skb)->pkt_key->ipv4.addr.src = addr;
>> +}
>> +
>> +static void flow_key_set_ipv4_dst(struct sk_buff *skb, __be32 addr)
>> +{
>> +     OVS_CB(skb)->pkt_key->ipv4.addr.src = addr;
>> +}
>> +
>> +static void flow_key_set_ip_tos(struct sk_buff *skb, u8 tos)
>> +{
>> +     OVS_CB(skb)->pkt_key->ip.tos = tos;
>> +}
>> +
>> +static void flow_key_set_ip_ttl(struct sk_buff *skb, u8 ttl)
>> +{
>> +     OVS_CB(skb)->pkt_key->ip.ttl = ttl;
>> +}
>> +
>> +static void flow_key_set_ipv6_src(struct sk_buff *skb,
>> +                               const __be32 addr[4])
>> +{
>> +     memcpy(&OVS_CB(skb)->pkt_key->ipv6.addr.src, addr, sizeof(__be32[4]));
>> +}
>> +
>> +static void flow_key_set_ipv6_dst(struct sk_buff *skb,
>> +                               const __be32 addr[4])
>> +{
>> +     memcpy(&OVS_CB(skb)->pkt_key->ipv6.addr.dst, addr, sizeof(__be32[4]));
>> +}
>> +
>> +static void flow_key_set_ipv6_fl(struct sk_buff *skb,
>> +                              const struct ipv6hdr *nh)
>> +{
>> +     OVS_CB(skb)->pkt_key->ipv6.label = *(__be32 *)nh &
>> +                                        htonl(IPV6_FLOWINFO_FLOWLABEL);
>> +}
>> +
>> +static void flow_key_set_tp_src(struct sk_buff *skb, __be16 port)
>> +{
>> +     OVS_CB(skb)->pkt_key->tp.src = port;
>> +}
>> +
>> +static void flow_key_set_tp_dst(struct sk_buff *skb, __be16 port)
>> +{
>> +     OVS_CB(skb)->pkt_key->tp.dst = port;
>> +}
>> +
>> +static void invalidate_skb_flow_key(struct sk_buff *skb)
>> +{
>> +     OVS_CB(skb)->pkt_key->eth.type = htons(0);
>> +}
>> +
>> +static bool is_skb_flow_key_valid(struct sk_buff *skb)
>> +{
>> +     return !!OVS_CB(skb)->pkt_key->eth.type;
>> +}
>> +
>> static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
>>                             const struct nlattr *attr, int len);
>>
>> @@ -90,6 +179,7 @@ static int push_mpls(struct sk_buff *skb,
>>       if (!ovs_skb_get_inner_protocol(skb))
>>               ovs_skb_set_inner_protocol(skb, skb->protocol);
>>       skb->protocol = mpls->mpls_ethertype;
>> +     invalidate_skb_flow_key(skb);
>>       return 0;
>> }
>>
>> @@ -120,6 +210,7 @@ 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_skb_flow_key(skb);
>>       return 0;
>> }
>>
>> @@ -139,7 +230,7 @@ static int set_mpls(struct sk_buff *skb, const __be32 *mpls_lse)
>>       }
>>
>>       *stack = *mpls_lse;
>> -
>> +     flow_key_set_mpls_top_lse(skb, *stack);
>>       return 0;
>> }
>>
>> @@ -189,9 +280,12 @@ 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)) {
>> +             flow_key_set_vlan_tci(skb, 0);
>>               return 0;
>> +     }
>>
>> +     invalidate_skb_flow_key(skb);
>>       err = __pop_vlan_tci(skb, &tci);
>>       if (unlikely(err))
>>               return err;
>> @@ -218,6 +312,9 @@ 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_skb_flow_key(skb);
>> +     } else {
>> +             flow_key_set_vlan_tci(skb,  vlan->vlan_tci);
>>       }
>>       __vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
>>       return 0;
>> @@ -238,11 +335,13 @@ static int set_eth_addr(struct sk_buff *skb,
>>
>>       ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
>>
>> +     flow_key_set_eth_src(skb, eth_key->eth_src);
>> +     flow_key_set_eth_dst(skb, 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);
>>
>> @@ -333,17 +432,25 @@ 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);
>> +             flow_key_set_ipv4_src(skb, 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);
>> +             flow_key_set_ipv4_dst(skb, 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);
>> +             flow_key_set_ip_tos(skb, 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);
>> +             flow_key_set_ip_ttl(skb, ipv4_key->ipv4_ttl);
>> +     }
>>
>>       return 0;
>> }
>> @@ -364,9 +471,11 @@ 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);
>> +             flow_key_set_ipv6_src(skb, ipv6_key->ipv6_src);
>> +     }
>>
>>       if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) {
>>               unsigned int offset = 0;
>> @@ -380,12 +489,17 @@ 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);
>> +             flow_key_set_ipv6_dst(skb, ipv6_key->ipv6_dst);
>>       }
>>
>>       set_ipv6_tc(nh, ipv6_key->ipv6_tclass);
>> +     flow_key_set_ip_tos(skb, ipv6_get_dsfield(nh));
>> +
>>       set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));
>> -     nh->hop_limit = ipv6_key->ipv6_hlimit;
>> +     flow_key_set_ipv6_fl(skb, nh);
>>
>> +     nh->hop_limit = ipv6_key->ipv6_hlimit;
>> +     flow_key_set_ip_ttl(skb, ipv6_key->ipv6_hlimit);
>>       return 0;
>> }
>>
>> @@ -424,11 +538,15 @@ 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);
>> +             flow_key_set_tp_src(skb, 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);
>> +             flow_key_set_tp_dst(skb, udp_port_key->udp_dst);
>> +     }
>>
>>       return 0;
>> }
>> @@ -444,17 +562,21 @@ 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);
>> +             flow_key_set_tp_src(skb, 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);
>> +             flow_key_set_tp_dst(skb, tcp_port_key->tcp_dst);
>> +     }
>>
>>       return 0;
>> }
>>
>> static int set_sctp(struct sk_buff *skb,
>> -                  const struct ovs_key_sctp *sctp_port_key)
>> +                 const struct ovs_key_sctp *sctp_port_key)
>> {
>>       struct sctphdr *sh;
>>       int err;
>> @@ -481,6 +603,8 @@ static int set_sctp(struct sk_buff *skb,
>>               sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
>>
>>               skb_clear_hash(skb);
>> +             flow_key_set_tp_src(skb, sctp_port_key->sctp_src);
>> +             flow_key_set_tp_dst(skb, sctp_port_key->sctp_dst);
>>       }
>>
>>       return 0;
>> @@ -531,6 +655,7 @@ static bool last_action(const struct nlattr *a, int rem)
>> static int sample(struct datapath *dp, struct sk_buff *skb,
>>                 const struct nlattr *attr)
>> {
>> +     struct sw_flow_key sample_key;
>>       const struct nlattr *acts_list = NULL;
>>       const struct nlattr *a;
>>       struct sk_buff *sample_skb;
>> @@ -569,6 +694,9 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
>>               if (!sample_skb)
>>                       /* Skip the sample action when out of memory. */
>>                       return 0;
>> +
>> +             sample_key = *OVS_CB(skb)->pkt_key;
>> +             OVS_CB(sample_skb)->pkt_key = &sample_key;
>>       }
>>
>>       /* Note that do_execute_actions() never consumes skb.
>> @@ -603,10 +731,12 @@ static int execute_set_action(struct sk_buff *skb,
>>       switch (nla_type(nested_attr)) {
>>       case OVS_KEY_ATTR_PRIORITY:
>>               skb->priority = nla_get_u32(nested_attr);
>> +             flow_key_set_priority(skb, skb->priority);
>>               break;
>>
>>       case OVS_KEY_ATTR_SKB_MARK:
>>               skb->mark = nla_get_u32(nested_attr);
>> +             flow_key_set_skb_mark(skb, skb->mark);
>>               break;
>>
>>       case OVS_KEY_ATTR_TUNNEL_INFO:
>> @@ -645,21 +775,53 @@ static int execute_set_action(struct sk_buff *skb,
>>       return err;
>> }
>>
>> +static void flow_key_clone_recirc(struct sk_buff *skb, u32 recirc_id,
>> +                               struct sw_flow_key *recirc_key)
>> +{
>> +     *recirc_key = *OVS_CB(skb)->pkt_key;
>> +     recirc_key->recirc_id = recirc_id;
>> +     OVS_CB(skb)->pkt_key = recirc_key;
>> +}
>> +
>> +static void flow_key_set_recirc_id(struct sk_buff *skb, u32 recirc_id)
>> +{
>> +     OVS_CB(skb)->pkt_key->recirc_id = recirc_id;
>> +}
>> +
>> static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
>> -                       const struct nlattr *a)
>> +                       const struct nlattr *a, int rem)
>> {
>>       struct sw_flow_key recirc_key;
>>       int err;
>>
>> -     err = ovs_flow_key_extract_recirc(nla_get_u32(a), OVS_CB(skb)->pkt_key,
>> -                                       skb, &recirc_key);
>> -     if (err) {
>> -             kfree_skb(skb);
>> -             return err;
>> +     if (!last_action(a, rem)) {
>> +             /* Recirc action is the not the last action
>> +              * of the action list. */
>> +             skb = skb_clone(skb, GFP_ATOMIC);
>> +
>> +             /* Skip the recirc action when out of memory, but
>> +              * continue on with the rest of the action list. */
>> +             if (!skb)
>> +                     return 0;
>>       }
>>
>> -     ovs_dp_process_packet(skb, true);
>> +     if (is_skb_flow_key_valid(skb)) {
>> +             if (!last_action(a, rem))
>> +                     flow_key_clone_recirc(skb, nla_get_u32(a), &recirc_key);
>> +             else
>> +                     flow_key_set_recirc_id(skb, nla_get_u32(a));
>> +     } else {
>> +             struct sw_flow_key *pkt_key = OVS_CB(skb)->pkt_key;
>>
>> +             err = ovs_flow_key_extract_recirc(nla_get_u32(a), pkt_key,
>> +                                               skb, &recirc_key);
>> +             if (err) {
>> +                     kfree_skb(skb);
>> +                     return err;
>> +             }
>> +     }
>> +
>> +     ovs_dp_process_packet(skb, true);
>>       return 0;
>> }
>>
>> @@ -719,23 +881,9 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
>>                       err = pop_vlan(skb);
>>                       break;
>>
>> -             case OVS_ACTION_ATTR_RECIRC: {
>> -                     struct sk_buff *recirc_skb;
>> -
>> -                     if (last_action(a, rem))
>> -                             return execute_recirc(dp, skb, a);
>> -
>> -                     /* Recirc action is the not the last action
>> -                      * of the action list. */
>> -                     recirc_skb = skb_clone(skb, GFP_ATOMIC);
>> -
>> -                     /* Skip the recirc action when out of memory, but
>> -                      * continue on with the rest of the action list. */
>> -                     if (recirc_skb)
>> -                             err = execute_recirc(dp, recirc_skb, a);
>> -
>> +             case OVS_ACTION_ATTR_RECIRC:
>> +                     err = execute_recirc(dp, skb, a, rem);
>>                       break;
>> -             }
>>
>>               case OVS_ACTION_ATTR_SET:
>>                       err = execute_set_action(skb, nla_data(a));
>> --
>> 1.9.3
>>
>> _______________________________________________
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>> dev at openvswitch.org
>> http://openvswitch.org/mailman/listinfo/dev
>



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