[ovs-dev] [PATCH V2 10/14] netdev-offload-dpdk: Support tunnel pop action

Sriharsha Basavapatna sriharsha.basavapatna at broadcom.com
Thu Feb 25 07:35:00 UTC 2021


On Wed, Feb 24, 2021 at 1:50 PM Eli Britstein <elibr at nvidia.com> wrote:
>
>
> On 2/24/2021 9:52 AM, Sriharsha Basavapatna wrote:
> > On Wed, Feb 10, 2021 at 8:57 PM Eli Britstein <elibr at nvidia.com> wrote:
> >> Support tunnel pop action.
> >>
> >> Signed-off-by: Eli Britstein <elibr at nvidia.com>
> >> Reviewed-by: Gaetan Rivet <gaetanr at nvidia.com>
> >> ---
> >>   Documentation/howto/dpdk.rst |   1 +
> >>   NEWS                         |   1 +
> >>   lib/netdev-offload-dpdk.c    | 173 ++++++++++++++++++++++++++++++++---
> >>   3 files changed, 160 insertions(+), 15 deletions(-)
> >>
> >> diff --git a/Documentation/howto/dpdk.rst b/Documentation/howto/dpdk.rst
> >> index f0d45e47b..4918d80f3 100644
> >> --- a/Documentation/howto/dpdk.rst
> >> +++ b/Documentation/howto/dpdk.rst
> >> @@ -398,6 +398,7 @@ Supported actions for hardware offload are:
> >>   - VLAN Push/Pop (push_vlan/pop_vlan).
> >>   - Modification of IPv6 (set_field:<ADDR>->ipv6_src/ipv6_dst/mod_nw_ttl).
> >>   - Clone/output (tnl_push and output) for encapsulating over a tunnel.
> >> +- Tunnel pop, for changing from a physical port to a vport.
> >>
> >>   Further Reading
> >>   ---------------
> >> diff --git a/NEWS b/NEWS
> >> index a7bffce97..6850d5621 100644
> >> --- a/NEWS
> >> +++ b/NEWS
> >> @@ -26,6 +26,7 @@ v2.15.0 - xx xxx xxxx
> >>      - DPDK:
> >>        * Removed support for vhost-user dequeue zero-copy.
> >>        * Add support for DPDK 20.11.
> >> +     * Add hardware offload support for tunnel pop action (experimental).
> >>      - Userspace datapath:
> >>        * Add the 'pmd' option to "ovs-appctl dpctl/dump-flows", which
> >>          restricts a flow dump to a single PMD thread if set.
> >> diff --git a/lib/netdev-offload-dpdk.c b/lib/netdev-offload-dpdk.c
> >> index 78f866080..493cc9159 100644
> >> --- a/lib/netdev-offload-dpdk.c
> >> +++ b/lib/netdev-offload-dpdk.c
> >> @@ -140,15 +140,30 @@ struct flow_actions {
> >>       struct rte_flow_action *actions;
> >>       int cnt;
> >>       int current_max;
> >> +    struct netdev *tnl_netdev;
> >> +    /* tnl_actions is the opaque array of actions returned by the PMD. */
> >> +    struct rte_flow_action *tnl_actions;
> > Why is this an opaque array ? Since it is struct rte_flow_action, OVS
> > knows the type and members. Is it opaque because the value of
> > rte_flow_action_type member is unknown to OVS ? Is it a private action
> > type and if so how does the PMD ensure that it doesn't conflict with
> > standard action types ?
>
> True it is not used by OVS, but that's not why it opaque. Although it is
> struct rte_flow_action array, the PMD may use its own private actions,
> not defined in rte_flow.h, thus not known to the application.
>
> The details of this array is under the PMD's responsibility.

So this means the PMD has to pick a range of private action values
that are not defined in rte_flow.h,  but what if later a new action
type with the same value is added to rte_flow.h ?
The other question is if the PMD could use one of the existing action
types in rte_flow.h [i.e, to avoid defining its own private action
types] and return it in the opaque action array ?

>
> >
> >> +    uint32_t num_of_tnl_actions;
> >> +    /* tnl_actions_pos is where the tunnel actions starts within the 'actions'
> >> +     * field.
> >> +     */
> >> +    int tnl_actions_pos;
> > Names should indicate that they are private or pmd specific ?
> >
> > tnl_actions --> tnl_private_actions or tnl_pmd_actions
> > num_of_tnl_actions --> num_private_tnl_actions or num_pmd_tnl_actions
> > tnl_actions_pos --> tnl_private_actions_pos or tnl_pmd_actions_pos
> OK. _pmd_
> >
> >> +    struct ds s_tnl;
> >>   };
> >>
> >>   static void
> >> -dump_flow_attr(struct ds *s, const struct rte_flow_attr *attr)
> >> +dump_flow_attr(struct ds *s, struct ds *s_extra,
> >> +               const struct rte_flow_attr *attr,
> >> +               struct flow_actions *flow_actions)
> >>   {
> >> -    ds_put_format(s, "%s%spriority %"PRIu32" group %"PRIu32" %s",
> >> +    if (flow_actions->num_of_tnl_actions) {
> >> +        ds_clone(s_extra, &flow_actions->s_tnl);
> >> +    }
> >> +    ds_put_format(s, "%s%spriority %"PRIu32" group %"PRIu32" %s%s",
> >>                     attr->ingress  ? "ingress " : "",
> >>                     attr->egress   ? "egress " : "", attr->priority, attr->group,
> >> -                  attr->transfer ? "transfer " : "");
> >> +                  attr->transfer ? "transfer " : "",
> >> +                  flow_actions->num_of_tnl_actions ? "tunnel_set 1 " : "");
> >>   }
> >>
> >>   /* Adds one pattern item 'field' with the 'mask' to dynamic string 's' using
> >> @@ -395,9 +410,19 @@ dump_vxlan_encap(struct ds *s, const struct rte_flow_item *items)
> >>
> >>   static void
> >>   dump_flow_action(struct ds *s, struct ds *s_extra,
> >> -                 const struct rte_flow_action *actions)
> >> +                 struct flow_actions *flow_actions, int act_index)
> >>   {
> >> -    if (actions->type == RTE_FLOW_ACTION_TYPE_MARK) {
> >> +    const struct rte_flow_action *actions = &flow_actions->actions[act_index];
> >> +
> >> +    if (actions->type == RTE_FLOW_ACTION_TYPE_END) {
> >> +        ds_put_cstr(s, "end");
> >> +    } else if (flow_actions->num_of_tnl_actions &&
> >> +               act_index >= flow_actions->tnl_actions_pos &&
> >> +               act_index < flow_actions->tnl_actions_pos +
> >> +                           flow_actions->num_of_tnl_actions) {
> >> +        /* Opaque PMD tunnel actions is skipped. */
> > Wouldn't it be useful to at least print the value of PMD action types ?
> The only way we can print them as raw numbers. I see little added value
> for this on one hand, but on the other hand it will defect the testpmd
> format print, so I think better to avoid.

It might be useful for debugging ?
> >
> >> +        return;
> >> +    } else if (actions->type == RTE_FLOW_ACTION_TYPE_MARK) {
> >>           const struct rte_flow_action_mark *mark = actions->conf;
> >>
> >>           ds_put_cstr(s, "mark ");
> >> @@ -528,6 +553,14 @@ dump_flow_action(struct ds *s, struct ds *s_extra,
> >>           ds_put_cstr(s, "vxlan_encap / ");
> >>           dump_vxlan_encap(s_extra, items);
> >>           ds_put_cstr(s_extra, ";");
> >> +    } else if (actions->type == RTE_FLOW_ACTION_TYPE_JUMP) {
> >> +        const struct rte_flow_action_jump *jump = actions->conf;
> >> +
> >> +        ds_put_cstr(s, "jump ");
> >> +        if (jump) {
> >> +            ds_put_format(s, "group %"PRIu32" ", jump->group);
> >> +        }
> >> +        ds_put_cstr(s, "/ ");
> >>       } else {
> >>           ds_put_format(s, "unknown rte flow action (%d)\n", actions->type);
> >>       }
> >> @@ -537,20 +570,21 @@ static struct ds *
> >>   dump_flow(struct ds *s, struct ds *s_extra,
> >>             const struct rte_flow_attr *attr,
> >>             const struct rte_flow_item *items,
> >> -          const struct rte_flow_action *actions)
> >> +          struct flow_actions *flow_actions)
> >>   {
> >> +    int i;
> >> +
> >>       if (attr) {
> >> -        dump_flow_attr(s, attr);
> >> +        dump_flow_attr(s, s_extra, attr, flow_actions);
> >>       }
> >>       ds_put_cstr(s, "pattern ");
> >>       while (items && items->type != RTE_FLOW_ITEM_TYPE_END) {
> >>           dump_flow_pattern(s, items++);
> >>       }
> >>       ds_put_cstr(s, "end actions ");
> >> -    while (actions && actions->type != RTE_FLOW_ACTION_TYPE_END) {
> >> -        dump_flow_action(s, s_extra, actions++);
> >> +    for (i = 0; i < flow_actions->cnt; i++) {
> >> +        dump_flow_action(s, s_extra, flow_actions, i);
> >>       }
> >> -    ds_put_cstr(s, "end");
> >>       return s;
> >>   }
> >>
> >> @@ -558,9 +592,10 @@ static struct rte_flow *
> >>   netdev_offload_dpdk_flow_create(struct netdev *netdev,
> >>                                   const struct rte_flow_attr *attr,
> >>                                   const struct rte_flow_item *items,
> >> -                                const struct rte_flow_action *actions,
> >> +                                struct flow_actions *flow_actions,
> >>                                   struct rte_flow_error *error)
> >>   {
> >> +    const struct rte_flow_action *actions = flow_actions->actions;
> >>       struct ds s_extra = DS_EMPTY_INITIALIZER;
> >>       struct ds s = DS_EMPTY_INITIALIZER;
> >>       struct rte_flow *flow;
> >> @@ -569,7 +604,7 @@ netdev_offload_dpdk_flow_create(struct netdev *netdev,
> >>       flow = netdev_dpdk_rte_flow_create(netdev, attr, items, actions, error);
> >>       if (flow) {
> >>           if (!VLOG_DROP_DBG(&rl)) {
> >> -            dump_flow(&s, &s_extra, attr, items, actions);
> >> +            dump_flow(&s, &s_extra, attr, items, flow_actions);
> >>               extra_str = ds_cstr(&s_extra);
> >>               VLOG_DBG_RL(&rl, "%s: rte_flow 0x%"PRIxPTR" %s  flow create %d %s",
> >>                           netdev_get_name(netdev), (intptr_t) flow, extra_str,
> >> @@ -584,7 +619,7 @@ netdev_offload_dpdk_flow_create(struct netdev *netdev,
> >>           VLOG_RL(&rl, level, "%s: rte_flow creation failed: %d (%s).",
> >>                   netdev_get_name(netdev), error->type, error->message);
> >>           if (!vlog_should_drop(&this_module, level, &rl)) {
> >> -            dump_flow(&s, &s_extra, attr, items, actions);
> >> +            dump_flow(&s, &s_extra, attr, items, flow_actions);
> >>               extra_str = ds_cstr(&s_extra);
> >>               VLOG_RL(&rl, level, "%s: Failed flow: %s  flow create %d %s",
> >>                       netdev_get_name(netdev), extra_str,
> >> @@ -640,6 +675,23 @@ add_flow_action(struct flow_actions *actions, enum rte_flow_action_type type,
> >>       actions->cnt++;
> >>   }
> >>
> >> +static void
> >> +add_flow_tnl_actions(struct flow_actions *actions,
> >> +                     struct netdev *tnl_netdev,
> >> +                     struct rte_flow_action *tnl_actions,
> >> +                     uint32_t num_of_tnl_actions)
> >> +{
> >> +    int i;
> >> +
> >> +    actions->tnl_netdev = tnl_netdev;
> >> +    actions->tnl_actions_pos = actions->cnt;
> >> +    actions->tnl_actions = tnl_actions;
> >> +    actions->num_of_tnl_actions = num_of_tnl_actions;
> >> +    for (i = 0; i < num_of_tnl_actions; i++) {
> >> +        add_flow_action(actions, tnl_actions[i].type, tnl_actions[i].conf);
> >> +    }
> >> +}
> >> +
> >>   static void
> >>   free_flow_patterns(struct flow_patterns *patterns)
> >>   {
> >> @@ -661,9 +713,23 @@ free_flow_patterns(struct flow_patterns *patterns)
> >>   static void
> >>   free_flow_actions(struct flow_actions *actions)
> >>   {
> >> +    struct rte_flow_error error;
> >>       int i;
> >>
> >>       for (i = 0; i < actions->cnt; i++) {
> >> +        if (actions->num_of_tnl_actions && i == actions->tnl_actions_pos) {
> >> +            if (netdev_dpdk_rte_flow_tunnel_action_decap_release
> >> +                    (actions->tnl_netdev, actions->tnl_actions,
> >> +                     actions->num_of_tnl_actions, &error)) {
> >> +                VLOG_DBG_RL(&rl, "%s: "
> >> +                            "netdev_dpdk_rte_flow_tunnel_action_decap_release "
> >> +                            "failed: %d (%s).",
> >> +                            netdev_get_name(actions->tnl_netdev),
> >> +                            error.type, error.message);
> >> +            }
> >> +            i += actions->num_of_tnl_actions - 1;
> >> +            continue;
> >> +        }
> >>           if (actions->actions[i].conf) {
> >>               free(CONST_CAST(void *, actions->actions[i].conf));
> >>           }
> >> @@ -671,6 +737,7 @@ free_flow_actions(struct flow_actions *actions)
> >>       free(actions->actions);
> >>       actions->actions = NULL;
> >>       actions->cnt = 0;
> >> +    ds_destroy(&actions->s_tnl);
> >>   }
> >>
> >>   static int
> >> @@ -960,7 +1027,7 @@ netdev_offload_dpdk_mark_rss(struct flow_patterns *patterns,
> >>       add_flow_mark_rss_actions(&actions, flow_mark, netdev);
> >>
> >>       flow = netdev_offload_dpdk_flow_create(netdev, &flow_attr, patterns->items,
> >> -                                           actions.actions, &error);
> >> +                                           &actions, &error);
> >>
> >>       free_flow_actions(&actions);
> >>       return flow;
> >> @@ -1307,6 +1374,78 @@ parse_clone_actions(struct netdev *netdev,
> >>       return 0;
> >>   }
> >>
> >> +static void
> >> +add_jump_action(struct flow_actions *actions, uint32_t group)
> >> +{
> >> +    struct rte_flow_action_jump *jump = xzalloc (sizeof *jump);
> >> +
> >> +    jump->group = group;
> >> +    add_flow_action(actions, RTE_FLOW_ACTION_TYPE_JUMP, jump);
> >> +}
> >> +
> >> +static int
> >> +vport_to_rte_tunnel(struct netdev *vport,
> >> +                    struct rte_flow_tunnel *tunnel,
> >> +                    struct netdev *netdev,
> >> +                    struct ds *s_tnl)
> >> +{
> >> +    const struct netdev_tunnel_config *tnl_cfg;
> >> +
> >> +    memset(tunnel, 0, sizeof *tunnel);
> >> +    if (!strcmp(netdev_get_type(vport), "vxlan")) {
> >> +        tunnel->type = RTE_FLOW_ITEM_TYPE_VXLAN;
> >> +        tnl_cfg = netdev_get_tunnel_config(vport);
> >> +        if (!tnl_cfg) {
> >> +            return -1;
> >> +        }
> >> +        tunnel->tp_dst = tnl_cfg->dst_port;
> >> +        if (!VLOG_DROP_DBG(&rl)) {
> >> +            ds_put_format(s_tnl, "flow tunnel create %d type vxlan; ",
> >> +                          netdev_dpdk_get_port_id(netdev));
> >> +        }
> >> +    } else {
> >> +        OVS_NOT_REACHED();
> >> +    }
> >> +
> >> +    return 0;
> >> +}
> >> +
> >> +static int
> >> +add_tnl_pop_action(struct netdev *netdev,
> >> +                   struct flow_actions *actions,
> >> +                   const struct nlattr *nla)
> >> +{
> >> +    struct rte_flow_action *tnl_actions = NULL;
> >> +    uint32_t num_of_tnl_actions = 0;
> >> +    struct rte_flow_tunnel tunnel;
> >> +    struct rte_flow_error error;
> >> +    struct netdev *vport;
> >> +    odp_port_t port;
> >> +    int ret;
> >> +
> >> +    port = nl_attr_get_odp_port(nla);
> >> +    vport = netdev_ports_get(port, netdev->dpif_type);
> >> +    if (vport == NULL) {
> >> +        return -1;
> >> +    }
> >> +    ret = vport_to_rte_tunnel(vport, &tunnel, netdev, &actions->s_tnl);
> >> +    netdev_close(vport);
> >> +    if (ret) {
> >> +        return ret;
> >> +    }
> >> +    ret = netdev_dpdk_rte_flow_tunnel_decap_set(netdev, &tunnel, &tnl_actions,
> >> +                                                &num_of_tnl_actions, &error);
> >> +    if (ret) {
> >> +        VLOG_DBG_RL(&rl, "%s: netdev_dpdk_rte_flow_tunnel_decap_set failed: "
> >> +                    "%d (%s).", netdev_get_name(netdev), error.type,
> >> +                    error.message);
> >> +        return ret;
> >> +    }
> >> +    add_flow_tnl_actions(actions, netdev, tnl_actions, num_of_tnl_actions);
> >> +    add_jump_action(actions, 0);
> > It is not clear why jump action is added and with a group value of 0 ?
>
> This is equivalent to dp_netdev_recirculate, when the group represents
> the recirc_id that is kept 0.
>
> I will add a comment.

But this is flow-F1 and there's no recirculation at this point. How
should the PMD interpret this ?


>
> >
> > Thanks,
> > -Harsha
> >> +    return 0;
> >> +}
> >> +
> >>   static int
> >>   parse_flow_actions(struct netdev *netdev,
> >>                      struct flow_actions *actions,
> >> @@ -1351,6 +1490,10 @@ parse_flow_actions(struct netdev *netdev,
> >>                                       clone_actions_len)) {
> >>                   return -1;
> >>               }
> >> +        } else if (nl_attr_type(nla) == OVS_ACTION_ATTR_TUNNEL_POP) {
> >> +            if (add_tnl_pop_action(netdev, actions, nla)) {
> >> +                return -1;
> >> +            }
> >>           } else {
> >>               VLOG_DBG_RL(&rl, "Unsupported action type %d", nl_attr_type(nla));
> >>               return -1;
> >> @@ -1383,7 +1526,7 @@ netdev_offload_dpdk_actions(struct netdev *netdev,
> >>           goto out;
> >>       }
> >>       flow = netdev_offload_dpdk_flow_create(netdev, &flow_attr, patterns->items,
> >> -                                           actions.actions, &error);
> >> +                                           &actions, &error);
> >>   out:
> >>       free_flow_actions(&actions);
> >>       return flow;
> >> --
> >> 2.28.0.546.g385c171
> >>

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