flow.c

Go to the documentation of this file.

/*
 * Copyright (c) 2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include <vnet/vnet.h>
#include <vppinfra/vec.h>
#include <vppinfra/format.h>
#include <assert.h>
 
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ethernet/arp_packet.h>
#include <vnet/vxlan/vxlan.h>
#include <dpdk/device/dpdk.h>
#include <dpdk/device/dpdk_priv.h>
#include <vppinfra/error.h>
 
#define FLOW_IS_ETHERNET_CLASS(f) \
  (f->type == VNET_FLOW_TYPE_ETHERNET)
 
#define FLOW_IS_IPV4_CLASS(f) \
  ((f->type == VNET_FLOW_TYPE_IP4) || \
    (f->type == VNET_FLOW_TYPE_IP4_N_TUPLE) || \
    (f->type == VNET_FLOW_TYPE_IP4_N_TUPLE_TAGGED) || \
    (f->type == VNET_FLOW_TYPE_IP4_VXLAN) || \
    (f->type == VNET_FLOW_TYPE_IP4_GTPC) || \
    (f->type == VNET_FLOW_TYPE_IP4_GTPU) || \
    (f->type == VNET_FLOW_TYPE_IP4_L2TPV3OIP) || \
    (f->type == VNET_FLOW_TYPE_IP4_IPSEC_ESP) || \
    (f->type == VNET_FLOW_TYPE_IP4_IPSEC_AH))
 
#define FLOW_IS_IPV6_CLASS(f) \
  ((f->type == VNET_FLOW_TYPE_IP6) || \
    (f->type == VNET_FLOW_TYPE_IP6_N_TUPLE) || \
    (f->type == VNET_FLOW_TYPE_IP6_N_TUPLE_TAGGED) || \
    (f->type == VNET_FLOW_TYPE_IP6_VXLAN))
 
/* check if flow is VLAN sensitive */
#define FLOW_HAS_VLAN_TAG(f) \
  ((f->type == VNET_FLOW_TYPE_IP4_N_TUPLE_TAGGED) || \
    (f->type == VNET_FLOW_TYPE_IP6_N_TUPLE_TAGGED))
 
/* check if flow is L3 type */
#define FLOW_IS_L3_TYPE(f) \
  ((f->type == VNET_FLOW_TYPE_IP4) || \
    (f->type == VNET_FLOW_TYPE_IP6))
 
/* check if flow is L4 type */
#define FLOW_IS_L4_TYPE(f) \
  ((f->type == VNET_FLOW_TYPE_IP4_N_TUPLE) || \
    (f->type == VNET_FLOW_TYPE_IP6_N_TUPLE) || \
    (f->type == VNET_FLOW_TYPE_IP4_N_TUPLE_TAGGED) || \
    (f->type == VNET_FLOW_TYPE_IP6_N_TUPLE_TAGGED))
 
/* check if flow is L4 tunnel type */
#define FLOW_IS_L4_TUNNEL_TYPE(f) \
  ((f->type == VNET_FLOW_TYPE_IP4_VXLAN) || \
    (f->type == VNET_FLOW_TYPE_IP6_VXLAN) || \
    (f->type == VNET_FLOW_TYPE_IP4_GTPC) || \
    (f->type == VNET_FLOW_TYPE_IP4_GTPU))
 
/* constant structs */
static const struct rte_flow_attr ingress = {.ingress = 1 };
 
static inline bool
mac_address_is_all_zero (const u8 addr[6])
{
  int i = 0;
 
  for (i = 0; i < 6; i++)
    if (addr[i] != 0)
      return false;
 
  return true;
}
 
static inline void
dpdk_flow_convert_rss_types (u64 type, u64 * dpdk_rss_type)
{
#define BIT_IS_SET(v, b) \
  ((v) & (u64)1<<(b))
 
  *dpdk_rss_type = 0;
 
#undef _
#define _(n, f, s) \
      if (n != -1 && BIT_IS_SET(type, n)) \
        *dpdk_rss_type |= f;
 
  foreach_dpdk_rss_hf
#undef _
    return;
}
 
static inline enum rte_eth_hash_function
dpdk_flow_convert_rss_func (vnet_rss_function_t func)
{
  enum rte_eth_hash_function rss_func;
 
  switch (func)
    {
    case VNET_RSS_FUNC_DEFAULT:
      rss_func = RTE_ETH_HASH_FUNCTION_DEFAULT;
      break;
    case VNET_RSS_FUNC_TOEPLITZ:
      rss_func = RTE_ETH_HASH_FUNCTION_TOEPLITZ;
      break;
    case VNET_RSS_FUNC_SIMPLE_XOR:
      rss_func = RTE_ETH_HASH_FUNCTION_SIMPLE_XOR;
      break;
    case VNET_RSS_FUNC_SYMMETRIC_TOEPLITZ:
      rss_func = RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ;
      break;
    default:
      rss_func = RTE_ETH_HASH_FUNCTION_MAX;
      break;
    }
 
  return rss_func;
}
 
static int
dpdk_flow_add (dpdk_device_t * xd, vnet_flow_t * f, dpdk_flow_entry_t * fe)
{
  struct rte_flow_item_eth eth[2] = { };
  struct rte_flow_item_ipv4 ip4[2] = { };
  struct rte_flow_item_ipv6 ip6[2] = { };
  struct rte_flow_item_udp udp[2] = { };
  struct rte_flow_item_tcp tcp[2] = { };
  struct rte_flow_item_gtp gtp[2] = { };
  struct rte_flow_item_l2tpv3oip l2tp[2] = { };
  struct rte_flow_item_esp esp[2] = { };
  struct rte_flow_item_ah ah[2] = { };
  struct rte_flow_action_mark mark = { 0 };
  struct rte_flow_action_queue queue = { 0 };
  struct rte_flow_action_rss rss = { 0 };
  struct rte_flow_item *item, *items = 0;
  struct rte_flow_action *action, *actions = 0;
  bool fate = false;
 
  enum
  {
    vxlan_hdr_sz = sizeof (vxlan_header_t),
    raw_sz = sizeof (struct rte_flow_item_raw)
  };
 
  union
  {
    struct rte_flow_item_raw item;
    u8 val[raw_sz + vxlan_hdr_sz];
  } raw[2];
 
  u16 src_port = 0, dst_port = 0, src_port_mask = 0, dst_port_mask = 0;
  u8 protocol = IP_PROTOCOL_RESERVED;
  int rv = 0;
 
  enum
  {
    FLOW_UNKNOWN_CLASS,
    FLOW_ETHERNET_CLASS,
    FLOW_IPV4_CLASS,
    FLOW_IPV6_CLASS,
  } flow_class = FLOW_UNKNOWN_CLASS;
 
  if (FLOW_IS_ETHERNET_CLASS (f))
    flow_class = FLOW_ETHERNET_CLASS;
  else if (FLOW_IS_IPV4_CLASS (f))
    flow_class = FLOW_IPV4_CLASS;
  else if (FLOW_IS_IPV6_CLASS (f))
    flow_class = FLOW_IPV6_CLASS;
  else
    return VNET_FLOW_ERROR_NOT_SUPPORTED;
 
  if (f->actions & (~xd->supported_flow_actions))
    return VNET_FLOW_ERROR_NOT_SUPPORTED;
 
  /* Match items */
  /* Layer 2, Ethernet */
  vec_add2 (items, item, 1);
  item->type = RTE_FLOW_ITEM_TYPE_ETH;
 
  if (flow_class == FLOW_ETHERNET_CLASS)
    {
      vnet_flow_ethernet_t *te = &f->ethernet;
 
      clib_memset (&eth[0], 0, sizeof (eth[0]));
      clib_memset (&eth[1], 0, sizeof (eth[1]));
 
      /* check if SMAC/DMAC/Ether_type assigned */
      if (!mac_address_is_all_zero (te->eth_hdr.dst_address))
        {
          clib_memcpy_fast (&eth[0].dst, &te->eth_hdr.dst_address,
                            sizeof (eth[0].dst));
          clib_memset (&eth[1].dst, 0xFF, sizeof (eth[1].dst));
        }
 
      if (!mac_address_is_all_zero (te->eth_hdr.src_address))
        {
          clib_memcpy_fast (&eth[0].src, &te->eth_hdr.src_address,
                            sizeof (eth[0].src));
          clib_memset (&eth[1].src, 0xFF, sizeof (eth[1].src));
        }
 
      if (te->eth_hdr.type)
        {
          eth[0].type = clib_host_to_net_u16 (te->eth_hdr.type);
          eth[1].type = clib_host_to_net_u16 (0xFFFF);
        }
 
      item->spec = eth;
      item->mask = eth + 1;
    }
  else
    {
      item->spec = NULL;
      item->mask = NULL;
    }
 
  /* currently only single empty vlan tag is supported */
  if (FLOW_HAS_VLAN_TAG (f))
    {
      vec_add2 (items, item, 1);
      item->type = RTE_FLOW_ITEM_TYPE_VLAN;
      item->spec = NULL;
      item->mask = NULL;
    }
 
  if (FLOW_IS_ETHERNET_CLASS (f))
    goto pattern_end;
 
  /* Layer 3, IP */
  vec_add2 (items, item, 1);
  if (flow_class == FLOW_IPV4_CLASS)
    {
      vnet_flow_ip4_t *ip4_ptr = &f->ip4;
 
      item->type = RTE_FLOW_ITEM_TYPE_IPV4;
      if ((!ip4_ptr->src_addr.mask.as_u32) &&
          (!ip4_ptr->dst_addr.mask.as_u32) && (!ip4_ptr->protocol.mask))
        {
          item->spec = NULL;
          item->mask = NULL;
        }
      else
        {
          ip4[0].hdr.src_addr = ip4_ptr->src_addr.addr.as_u32;
          ip4[1].hdr.src_addr = ip4_ptr->src_addr.mask.as_u32;
          ip4[0].hdr.dst_addr = ip4_ptr->dst_addr.addr.as_u32;
          ip4[1].hdr.dst_addr = ip4_ptr->dst_addr.mask.as_u32;
          ip4[0].hdr.next_proto_id = ip4_ptr->protocol.prot;
          ip4[1].hdr.next_proto_id = ip4_ptr->protocol.mask;
 
          item->spec = ip4;
          item->mask = ip4 + 1;
        }
 
      if (FLOW_IS_L4_TYPE (f) || FLOW_IS_L4_TUNNEL_TYPE (f))
        {
          vnet_flow_ip4_n_tuple_t *ip4_n_ptr = &f->ip4_n_tuple;
 
          src_port = ip4_n_ptr->src_port.port;
          dst_port = ip4_n_ptr->dst_port.port;
          src_port_mask = ip4_n_ptr->src_port.mask;
          dst_port_mask = ip4_n_ptr->dst_port.mask;
        }
 
      protocol = ip4_ptr->protocol.prot;
    }
  else if (flow_class == FLOW_IPV6_CLASS)
    {
      vnet_flow_ip6_t *ip6_ptr = &f->ip6;
 
      item->type = RTE_FLOW_ITEM_TYPE_IPV6;
 
      if ((ip6_ptr->src_addr.mask.as_u64[0] == 0) &&
          (ip6_ptr->src_addr.mask.as_u64[1] == 0) &&
          (!ip6_ptr->protocol.mask))
        {
          item->spec = NULL;
          item->mask = NULL;
        }
      else
        {
          clib_memcpy (ip6[0].hdr.src_addr, &ip6_ptr->src_addr.addr,
                       ARRAY_LEN (ip6_ptr->src_addr.addr.as_u8));
          clib_memcpy (ip6[1].hdr.src_addr, &ip6_ptr->src_addr.mask,
                       ARRAY_LEN (ip6_ptr->src_addr.mask.as_u8));
          clib_memcpy (ip6[0].hdr.dst_addr, &ip6_ptr->dst_addr.addr,
                       ARRAY_LEN (ip6_ptr->dst_addr.addr.as_u8));
          clib_memcpy (ip6[1].hdr.dst_addr, &ip6_ptr->dst_addr.mask,
                       ARRAY_LEN (ip6_ptr->dst_addr.mask.as_u8));
          ip6[0].hdr.proto = ip6_ptr->protocol.prot;
          ip6[1].hdr.proto = ip6_ptr->protocol.mask;
 
          item->spec = ip6;
          item->mask = ip6 + 1;
        }
 
      if (FLOW_IS_L4_TYPE (f) || FLOW_IS_L4_TUNNEL_TYPE (f))
        {
          vnet_flow_ip6_n_tuple_t *ip6_n_ptr = &f->ip6_n_tuple;
 
          src_port = ip6_n_ptr->src_port.port;
          dst_port = ip6_n_ptr->dst_port.port;
          src_port_mask = ip6_n_ptr->src_port.mask;
          dst_port_mask = ip6_n_ptr->dst_port.mask;
        }
 
      protocol = ip6_ptr->protocol.prot;
    }
 
  if (FLOW_IS_L3_TYPE (f))
    goto pattern_end;
 
  /* Layer 3, IP */
  vec_add2 (items, item, 1);
  switch (protocol)
    {
    case IP_PROTOCOL_L2TP:
      item->type = RTE_FLOW_ITEM_TYPE_L2TPV3OIP;
      l2tp[0].session_id = clib_host_to_net_u32 (f->ip4_l2tpv3oip.session_id);
      l2tp[1].session_id = ~0;
 
      item->spec = l2tp;
      item->mask = l2tp + 1;
      break;
 
    case IP_PROTOCOL_IPSEC_ESP:
      item->type = RTE_FLOW_ITEM_TYPE_ESP;
      esp[0].hdr.spi = clib_host_to_net_u32 (f->ip4_ipsec_esp.spi);
      esp[1].hdr.spi = ~0;
 
      item->spec = esp;
      item->mask = esp + 1;
      break;
 
    case IP_PROTOCOL_IPSEC_AH:
      item->type = RTE_FLOW_ITEM_TYPE_AH;
      ah[0].spi = clib_host_to_net_u32 (f->ip4_ipsec_ah.spi);
      ah[1].spi = ~0;
 
      item->spec = ah;
      item->mask = ah + 1;
      break;
    case IP_PROTOCOL_TCP:
      item->type = RTE_FLOW_ITEM_TYPE_TCP;
      if ((src_port_mask == 0) && (dst_port_mask == 0))
        {
          item->spec = NULL;
          item->mask = NULL;
        }
      else
        {
          tcp[0].hdr.src_port = clib_host_to_net_u16 (src_port);
          tcp[1].hdr.src_port = clib_host_to_net_u16 (src_port_mask);
          tcp[0].hdr.dst_port = clib_host_to_net_u16 (dst_port);
          tcp[1].hdr.dst_port = clib_host_to_net_u16 (dst_port_mask);
          item->spec = tcp;
          item->mask = tcp + 1;
        }
      break;
 
    case IP_PROTOCOL_UDP:
      item->type = RTE_FLOW_ITEM_TYPE_UDP;
      if ((src_port_mask == 0) && (dst_port_mask == 0))
        {
          item->spec = NULL;
          item->mask = NULL;
        }
      else
        {
          udp[0].hdr.src_port = clib_host_to_net_u16 (src_port);
          udp[1].hdr.src_port = clib_host_to_net_u16 (src_port_mask);
          udp[0].hdr.dst_port = clib_host_to_net_u16 (dst_port);
          udp[1].hdr.dst_port = clib_host_to_net_u16 (dst_port_mask);
          item->spec = udp;
          item->mask = udp + 1;
        }
 
      /* handle the UDP tunnels */
      if (f->type == VNET_FLOW_TYPE_IP4_GTPC)
        {
          gtp[0].teid = clib_host_to_net_u32 (f->ip4_gtpc.teid);
          gtp[1].teid = ~0;
 
          vec_add2 (items, item, 1);
          item->type = RTE_FLOW_ITEM_TYPE_GTPC;
          item->spec = gtp;
          item->mask = gtp + 1;
        }
      else if (f->type == VNET_FLOW_TYPE_IP4_GTPU)
        {
          gtp[0].teid = clib_host_to_net_u32 (f->ip4_gtpu.teid);
          gtp[1].teid = ~0;
 
          vec_add2 (items, item, 1);
          item->type = RTE_FLOW_ITEM_TYPE_GTPU;
          item->spec = gtp;
          item->mask = gtp + 1;
        }
      else if (f->type == VNET_FLOW_TYPE_IP4_VXLAN)
        {
          u32 vni = f->ip4_vxlan.vni;
 
          vxlan_header_t spec_hdr = {
            .flags = VXLAN_FLAGS_I,
            .vni_reserved = clib_host_to_net_u32 (vni << 8)
          };
          vxlan_header_t mask_hdr = {
            .flags = 0xff,
            .vni_reserved = clib_host_to_net_u32 (((u32) - 1) << 8)
          };
 
          clib_memset (raw, 0, sizeof raw);
          raw[0].item.relative = 1;
          raw[0].item.length = vxlan_hdr_sz;
 
          clib_memcpy_fast (raw[0].val + raw_sz, &spec_hdr, vxlan_hdr_sz);
          raw[0].item.pattern = raw[0].val + raw_sz;
          clib_memcpy_fast (raw[1].val + raw_sz, &mask_hdr, vxlan_hdr_sz);
          raw[1].item.pattern = raw[1].val + raw_sz;
 
          vec_add2 (items, item, 1);
          item->type = RTE_FLOW_ITEM_TYPE_RAW;
          item->spec = raw;
          item->mask = raw + 1;
        }
      break;
 
    default:
      rv = VNET_FLOW_ERROR_NOT_SUPPORTED;
      goto done;
    }
 
pattern_end:
  if ((f->actions & VNET_FLOW_ACTION_RSS) &&
      (f->rss_types & (1ULL << VNET_FLOW_RSS_TYPES_ESP)))
    {
 
      vec_add2 (items, item, 1);
      item->type = RTE_FLOW_ITEM_TYPE_ESP;
    }
 
  vec_add2 (items, item, 1);
  item->type = RTE_FLOW_ITEM_TYPE_END;
 
  /* Actions */
  /* Only one 'fate' can be assigned */
  if (f->actions & VNET_FLOW_ACTION_REDIRECT_TO_QUEUE)
    {
      vec_add2 (actions, action, 1);
      queue.index = f->redirect_queue;
      action->type = RTE_FLOW_ACTION_TYPE_QUEUE;
      action->conf = &queue;
      fate = true;
    }
 
  if (f->actions & VNET_FLOW_ACTION_DROP)
    {
      vec_add2 (actions, action, 1);
      action->type = RTE_FLOW_ACTION_TYPE_DROP;
      if (fate == true)
        {
          rv = VNET_FLOW_ERROR_INTERNAL;
          goto done;
        }
      else
        fate = true;
    }
 
  if (f->actions & VNET_FLOW_ACTION_RSS)
    {
      u64 rss_type = 0;
 
      vec_add2 (actions, action, 1);
      action->type = RTE_FLOW_ACTION_TYPE_RSS;
      action->conf = &rss;
 
      /* convert types to DPDK rss bitmask */
      dpdk_flow_convert_rss_types (f->rss_types, &rss_type);
 
      rss.types = rss_type;
      if ((rss.func = dpdk_flow_convert_rss_func (f->rss_fun)) ==
          RTE_ETH_HASH_FUNCTION_MAX)
        {
          rv = VNET_FLOW_ERROR_NOT_SUPPORTED;
          goto done;
        }
 
      if (fate == true)
        {
          rv = VNET_FLOW_ERROR_INTERNAL;
          goto done;
        }
      else
        fate = true;
    }
 
  if (fate == false)
    {
      vec_add2 (actions, action, 1);
      action->type = RTE_FLOW_ACTION_TYPE_PASSTHRU;
    }
 
  if (f->actions & VNET_FLOW_ACTION_MARK)
    {
      vec_add2 (actions, action, 1);
      mark.id = fe->mark;
      action->type = RTE_FLOW_ACTION_TYPE_MARK;
      action->conf = &mark;
    }
 
  vec_add2 (actions, action, 1);
  action->type = RTE_FLOW_ACTION_TYPE_END;
 
  rv = rte_flow_validate (xd->device_index, &ingress, items, actions,
                          &xd->last_flow_error);
 
  if (rv)
    {
      if (rv == -EINVAL)
        rv = VNET_FLOW_ERROR_NOT_SUPPORTED;
      else if (rv == -EEXIST)
        rv = VNET_FLOW_ERROR_ALREADY_EXISTS;
      else
        rv = VNET_FLOW_ERROR_INTERNAL;
 
      goto done;
    }
 
  fe->handle = rte_flow_create (xd->device_index, &ingress, items, actions,
                                &xd->last_flow_error);
 
  if (!fe->handle)
    rv = VNET_FLOW_ERROR_NOT_SUPPORTED;
 
done:
  vec_free (items);
  vec_free (actions);
  return rv;
}
 
int
dpdk_flow_ops_fn (vnet_main_t * vnm, vnet_flow_dev_op_t op, u32 dev_instance,
                  u32 flow_index, uword * private_data)
{
  dpdk_main_t *dm = &dpdk_main;
  vnet_flow_t *flow = vnet_get_flow (flow_index);
  dpdk_device_t *xd = vec_elt_at_index (dm->devices, dev_instance);
  dpdk_flow_entry_t *fe;
  dpdk_flow_lookup_entry_t *fle = 0;
  int rv;
 
  /* recycle old flow lookup entries only after the main loop counter
     increases - i.e. previously DMA'ed packets were handled */
  if (vec_len (xd->parked_lookup_indexes) > 0 &&
      xd->parked_loop_count != dm->vlib_main->main_loop_count)
    {
      u32 *fl_index;
 
      vec_foreach (fl_index, xd->parked_lookup_indexes)
        pool_put_index (xd->flow_lookup_entries, *fl_index);
      vec_reset_length (xd->parked_lookup_indexes);
    }
 
  if (op == VNET_FLOW_DEV_OP_DEL_FLOW)
    {
      fe = vec_elt_at_index (xd->flow_entries, *private_data);
 
      if ((rv = rte_flow_destroy (xd->device_index, fe->handle,
                                  &xd->last_flow_error)))
        return VNET_FLOW_ERROR_INTERNAL;
 
      if (fe->mark)
        {
          /* make sure no action is taken for in-flight (marked) packets */
          fle = pool_elt_at_index (xd->flow_lookup_entries, fe->mark);
          clib_memset (fle, -1, sizeof (*fle));
          vec_add1 (xd->parked_lookup_indexes, fe->mark);
          xd->parked_loop_count = dm->vlib_main->main_loop_count;
        }
 
      clib_memset (fe, 0, sizeof (*fe));
      pool_put (xd->flow_entries, fe);
 
      goto disable_rx_offload;
    }
 
  if (op != VNET_FLOW_DEV_OP_ADD_FLOW)
    return VNET_FLOW_ERROR_NOT_SUPPORTED;
 
  pool_get (xd->flow_entries, fe);
  fe->flow_index = flow->index;
 
  if (flow->actions == 0)
    {
      rv = VNET_FLOW_ERROR_NOT_SUPPORTED;
      goto done;
    }
 
  /* if we need to mark packets, assign one mark */
  if (flow->actions & (VNET_FLOW_ACTION_MARK |
                       VNET_FLOW_ACTION_REDIRECT_TO_NODE |
                       VNET_FLOW_ACTION_BUFFER_ADVANCE))
    {
      /* reserve slot 0 */
      if (xd->flow_lookup_entries == 0)
        pool_get_aligned (xd->flow_lookup_entries, fle,
                          CLIB_CACHE_LINE_BYTES);
      pool_get_aligned (xd->flow_lookup_entries, fle, CLIB_CACHE_LINE_BYTES);
      fe->mark = fle - xd->flow_lookup_entries;
 
      /* install entry in the lookup table */
      clib_memset (fle, -1, sizeof (*fle));
      if (flow->actions & VNET_FLOW_ACTION_MARK)
        fle->flow_id = flow->mark_flow_id;
      if (flow->actions & VNET_FLOW_ACTION_REDIRECT_TO_NODE)
        fle->next_index = flow->redirect_device_input_next_index;
      if (flow->actions & VNET_FLOW_ACTION_BUFFER_ADVANCE)
        fle->buffer_advance = flow->buffer_advance;
    }
  else
    fe->mark = 0;
 
  if ((xd->flags & DPDK_DEVICE_FLAG_RX_FLOW_OFFLOAD) == 0)
    {
      xd->flags |= DPDK_DEVICE_FLAG_RX_FLOW_OFFLOAD;
      dpdk_device_setup (xd);
    }
 
  switch (flow->type)
    {
    case VNET_FLOW_TYPE_ETHERNET:
    case VNET_FLOW_TYPE_IP4:
    case VNET_FLOW_TYPE_IP6:
    case VNET_FLOW_TYPE_IP4_N_TUPLE:
    case VNET_FLOW_TYPE_IP6_N_TUPLE:
    case VNET_FLOW_TYPE_IP4_VXLAN:
    case VNET_FLOW_TYPE_IP4_GTPC:
    case VNET_FLOW_TYPE_IP4_GTPU:
    case VNET_FLOW_TYPE_IP4_L2TPV3OIP:
    case VNET_FLOW_TYPE_IP4_IPSEC_ESP:
    case VNET_FLOW_TYPE_IP4_IPSEC_AH:
      if ((rv = dpdk_flow_add (xd, flow, fe)))
        goto done;
      break;
    default:
      rv = VNET_FLOW_ERROR_NOT_SUPPORTED;
      goto done;
    }
 
  *private_data = fe - xd->flow_entries;
 
done:
  if (rv)
    {
      clib_memset (fe, 0, sizeof (*fe));
      pool_put (xd->flow_entries, fe);
      if (fle)
        {
          clib_memset (fle, -1, sizeof (*fle));
          pool_put (xd->flow_lookup_entries, fle);
        }
    }
disable_rx_offload:
  if ((xd->flags & DPDK_DEVICE_FLAG_RX_FLOW_OFFLOAD) != 0
      && pool_elts (xd->flow_entries) == 0)
    {
      xd->flags &= ~DPDK_DEVICE_FLAG_RX_FLOW_OFFLOAD;
      dpdk_device_setup (xd);
    }
 
  return rv;
}
 
u8 *
format_dpdk_flow (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  u32 flow_index = va_arg (*args, u32);
  uword private_data = va_arg (*args, uword);
  dpdk_main_t *dm = &dpdk_main;
  dpdk_device_t *xd = vec_elt_at_index (dm->devices, dev_instance);
  dpdk_flow_entry_t *fe;
 
  if (flow_index == ~0)
    {
      s = format (s, "%-25s: %U\n", "supported flow actions",
                  format_flow_actions, xd->supported_flow_actions);
      s = format (s, "%-25s: %d\n", "last DPDK error type",
                  xd->last_flow_error.type);
      s = format (s, "%-25s: %s\n", "last DPDK error message",
                  xd->last_flow_error.message ? xd->last_flow_error.message :
                  "n/a");
      return s;
    }
 
  if (private_data >= vec_len (xd->flow_entries))
    return format (s, "unknown flow");
 
  fe = vec_elt_at_index (xd->flow_entries, private_data);
  s = format (s, "mark %u", fe->mark);
  return s;
}
 
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */