[ovs-dev] [PATCH V3 12/14] dpif-netdev: Provide orig_in_port in metadata for tunneled packets

Sriharsha Basavapatna sriharsha.basavapatna at broadcom.com
Mon Mar 15 09:04:03 UTC 2021


On Tue, Mar 2, 2021 at 4:56 PM Eli Britstein <elibr at nvidia.com> wrote:
>
> From: Sriharsha Basavapatna <sriharsha.basavapatna at broadcom.com>
>
> When an encapsulated packet is recirculated through a TUNNEL_POP
> action, the metadata gets reinitialized and the originating physical
> port information is lost. When this flow gets processed by the vport
> and it needs to be offloaded, we can't figure out the physical port
> through which the tunneled packet was received.
>
> Add a new member to the metadata: 'orig_in_port'. This is passed to
> the next stage during recirculation and the offload layer can use it
> to offload the flow to this physical port.
>
> Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna at broadcom.com>
> Signed-off-by: Eli Britstein <elibr at nvidia.com>
> Reviewed-by: Gaetan Rivet <gaetanr at nvidia.com>
> ---
>  lib/dpif-netdev.c    | 20 ++++++++++++++------
>  lib/netdev-offload.h |  1 +
>  lib/packets.h        |  8 +++++++-
>  3 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
> index 58cad7ded..291c6eaa4 100644
> --- a/lib/dpif-netdev.c
> +++ b/lib/dpif-netdev.c
> @@ -430,6 +430,7 @@ struct dp_flow_offload_item {
>      struct match match;
>      struct nlattr *actions;
>      size_t actions_len;
> +    odp_port_t orig_in_port; /* Originating in_port for tnl flows. */
>
>      struct ovs_list node;
>  };
> @@ -2695,11 +2696,13 @@ dp_netdev_flow_offload_put(struct dp_flow_offload_item *offload)
>          }
>      }
>      info.flow_mark = mark;
> +    info.orig_in_port = offload->orig_in_port;
>
>      port = netdev_ports_get(in_port, dpif_type_str);
>      if (!port) {
>          goto err_free;
>      }
> +
>      /* Taking a global 'port_mutex' to fulfill thread safety restrictions for
>       * the netdev-offload-dpdk module. */
>      ovs_mutex_lock(&pmd->dp->port_mutex);
> @@ -2797,7 +2800,8 @@ queue_netdev_flow_del(struct dp_netdev_pmd_thread *pmd,
>  static void
>  queue_netdev_flow_put(struct dp_netdev_pmd_thread *pmd,
>                        struct dp_netdev_flow *flow, struct match *match,
> -                      const struct nlattr *actions, size_t actions_len)
> +                      const struct nlattr *actions, size_t actions_len,
> +                      odp_port_t orig_in_port)
>  {
>      struct dp_flow_offload_item *offload;
>      int op;
> @@ -2823,6 +2827,7 @@ queue_netdev_flow_put(struct dp_netdev_pmd_thread *pmd,
>      offload->actions = xmalloc(actions_len);
>      memcpy(offload->actions, actions, actions_len);
>      offload->actions_len = actions_len;
> +    offload->orig_in_port = orig_in_port;
>
>      dp_netdev_append_flow_offload(offload);
>  }
> @@ -3624,7 +3629,8 @@ dp_netdev_get_mega_ufid(const struct match *match, ovs_u128 *mega_ufid)
>  static struct dp_netdev_flow *
>  dp_netdev_flow_add(struct dp_netdev_pmd_thread *pmd,
>                     struct match *match, const ovs_u128 *ufid,
> -                   const struct nlattr *actions, size_t actions_len)
> +                   const struct nlattr *actions, size_t actions_len,
> +                   odp_port_t orig_in_port)
>      OVS_REQUIRES(pmd->flow_mutex)
>  {
>      struct ds extra_info = DS_EMPTY_INITIALIZER;
> @@ -3690,7 +3696,8 @@ dp_netdev_flow_add(struct dp_netdev_pmd_thread *pmd,
>      cmap_insert(&pmd->flow_table, CONST_CAST(struct cmap_node *, &flow->node),
>                  dp_netdev_flow_hash(&flow->ufid));
>
> -    queue_netdev_flow_put(pmd, flow, match, actions, actions_len);
> +    queue_netdev_flow_put(pmd, flow, match, actions, actions_len,
> +                          orig_in_port);
>
>      if (OVS_UNLIKELY(!VLOG_DROP_DBG((&upcall_rl)))) {
>          struct ds ds = DS_EMPTY_INITIALIZER;
> @@ -3761,7 +3768,7 @@ flow_put_on_pmd(struct dp_netdev_pmd_thread *pmd,
>      if (!netdev_flow) {
>          if (put->flags & DPIF_FP_CREATE) {
>              dp_netdev_flow_add(pmd, match, ufid, put->actions,
> -                               put->actions_len);
> +                               put->actions_len, ODPP_NONE);
>          } else {
>              error = ENOENT;
>          }
> @@ -3777,7 +3784,7 @@ flow_put_on_pmd(struct dp_netdev_pmd_thread *pmd,
>              ovsrcu_set(&netdev_flow->actions, new_actions);
>
>              queue_netdev_flow_put(pmd, netdev_flow, match,
> -                                  put->actions, put->actions_len);
> +                                  put->actions, put->actions_len, ODPP_NONE);
>
>              if (stats) {
>                  get_dpif_flow_status(pmd->dp, netdev_flow, stats, NULL);
> @@ -7232,6 +7239,7 @@ handle_packet_upcall(struct dp_netdev_pmd_thread *pmd,
>      ovs_u128 ufid;
>      int error;
>      uint64_t cycles = cycles_counter_update(&pmd->perf_stats);
> +    odp_port_t orig_in_port = packet->md.orig_in_port;
>
>      match.tun_md.valid = false;
>      miniflow_expand(&key->mf, &match.flow);
> @@ -7281,7 +7289,7 @@ handle_packet_upcall(struct dp_netdev_pmd_thread *pmd,
>          if (OVS_LIKELY(!netdev_flow)) {
>              netdev_flow = dp_netdev_flow_add(pmd, &match, &ufid,
>                                               add_actions->data,
> -                                             add_actions->size);
> +                                             add_actions->size, orig_in_port);
>          }
>          ovs_mutex_unlock(&pmd->flow_mutex);
>          uint32_t hash = dp_netdev_flow_hash(&netdev_flow->ufid);
> diff --git a/lib/netdev-offload.h b/lib/netdev-offload.h
> index 5bf89f891..e7fcedae9 100644
> --- a/lib/netdev-offload.h
> +++ b/lib/netdev-offload.h
> @@ -76,6 +76,7 @@ struct offload_info {
>
>      bool tc_modify_flow_deleted; /* Indicate the tc modify flow put success
>                                    * to delete the original flow. */
> +    odp_port_t orig_in_port; /* Originating in_port for tnl flows. */
>  };
>
>  int netdev_flow_flush(struct netdev *);
> diff --git a/lib/packets.h b/lib/packets.h
> index 481bc22fa..515bb59b1 100644
> --- a/lib/packets.h
> +++ b/lib/packets.h
> @@ -115,6 +115,7 @@ PADDED_MEMBERS_CACHELINE_MARKER(CACHE_LINE_SIZE, cacheline0,
>      uint32_t ct_mark;           /* Connection mark. */
>      ovs_u128 ct_label;          /* Connection label. */
>      union flow_in_port in_port; /* Input port. */
> +    odp_port_t orig_in_port;    /* Originating in_port for tunneled packets */
>      struct conn *conn;          /* Cached conntrack connection. */
>      bool reply;                 /* True if reply direction. */
>      bool icmp_related;          /* True if ICMP related. */
> @@ -143,10 +144,14 @@ BUILD_ASSERT_DECL(offsetof(struct pkt_metadata, cacheline2) ==
>  static inline void
>  pkt_metadata_init_tnl(struct pkt_metadata *md)
>  {
> +    odp_port_t orig_in_port;
> +
>      /* Zero up through the tunnel metadata options. The length and table
>       * are before this and as long as they are empty, the options won't
> -     * be looked at. */
> +     * be looked at. Keep the orig_in_port field. */
> +    orig_in_port = md->in_port.odp_port;
>      memset(md, 0, offsetof(struct pkt_metadata, tunnel.metadata.opts));
> +    md->orig_in_port = orig_in_port;
>  }
>
>  static inline void
> @@ -173,6 +178,7 @@ pkt_metadata_init(struct pkt_metadata *md, odp_port_t port)
>      md->tunnel.ip_dst = 0;
>      md->tunnel.ipv6_dst = in6addr_any;
>      md->in_port.odp_port = port;
> +    md->orig_in_port = port;
>      md->conn = NULL;
>  }
>
> --
> 2.28.0.2311.g225365fb51
>

I don't see this code (from my initial patch). It is needed to handle
flow-modify.

diff --git a/lib/netdev-offload-dpdk.c b/lib/netdev-offload-dpdk.c
index 6cfdea8fc..bbdc561fd 100644
--- a/lib/netdev-offload-dpdk.c
+++ b/lib/netdev-offload-dpdk.c
@@ -63,6 +63,7 @@  struct rte_flow_data {
     bool actions_offloaded;
     struct dpif_flow_stats stats;
     struct ovs_list indirect;
+    odp_port_t orig_in_port;
 };

 static uint32_t
@@ -1935,6 +1936,10 @@  netdev_offload_dpdk_flow_put(struct netdev
*netdev, struct match *match,
     if (rte_flow_data && rte_flow_data->rte_flow) {
         old_stats = rte_flow_data->stats;
         modification = true;
+        if (netdev_vport_is_vport_class(netdev->netdev_class)) {
+            /* Retrieve orig_in_port saved earlier */
+            info->orig_in_port = rte_flow_data->orig_in_port;
+        }
         ret = netdev_offload_dpdk_flow_destroy(rte_flow_data);
         if (ret < 0) {
             return ret;
@@ -1949,6 +1954,10 @@  netdev_offload_dpdk_flow_put(struct netdev
*netdev, struct match *match,
     if (modification) {
         rte_flow_data->stats = old_stats;
     }
+    if (netdev_vport_is_vport_class(netdev->netdev_class)) {
+        /*  Save orig_in_port; need this if the flow gets modified later */
+        rte_flow_data->orig_in_port = info->orig_in_port;
+    }
     if (stats) {
         *stats = rte_flow_data->stats;
     }

Thanks,
-Harsha

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