ovs.txt

xport has the mapping of ofp_port_t and odp_port_t

http://docs.openvswitch.org/en/latest/faq/design/?highlight=dump-flows

VLOG_ERR("%s: cannot add a loopback device", devname);

===kernel===

ovs_dp_process_packet
    ovs_flow_tbl_lookup_stats
    ovs_dp_upcall(OVS_PACKET_CMD_MISS)
        queue_userspace_packet
            ovs_nla_put_key
                __ovs_nla_put_key
    ovs_execute_actions

netdev_frame_hook
netdev_port_receive
ovs_vport_receive
    ovs_flow_key_extract
        key_extract
    ovs_dp_process_packet

ovs_action_attr

===dp_netdevs===

p dp_netdevs

===vlan===

OVS_ACTION_ATTR_PUSH_VLAN

===backer===

open_dpif_backer

p all_dpif_backers
$4 = {
  map = {
    buckets = 0x7fece8 <all_dpif_backers+8>,
    one = 0x1969870,
    mask = 0,
    n = 1
  }
}
(gdb) p/x 128
$5 = 0x80
print *( struct dpif_backer  *) 0x1968ce0
$6 = {
  type = 0x198b240 "system",
  refcount = 1,
  dpif = 0x198bb40,
  udpif = 0x19696e0,

struct dpif_backer
    hmap odp_to_ofport_map  contains the mapping from ofp_port_t to struct struct ofport_dpif

to xport
to struct ofproto_dpif

===function===

(gdb) bt
#0  odp_key_from_dp_packet (buf=0x7f0054f9bff8, packet=0x7f0054fc5240) at lib/odp-util.c:5096
#1  0x000000000051632e in dpif_netlink_encode_execute (buf=0x7f0054f9bff8, d_exec=0x7f0054fb92f0, dp_ifindex=58) at lib/dpif-netlink.c:1858
#2  dpif_netlink_operate__ (dpif=dpif@entry=0x20a77f0, ops=ops@entry=0x7f0054fb6e90, n_ops=n_ops@entry=5) at lib/dpif-netlink.c:1944
#3  0x0000000000516f6e in dpif_netlink_operate_chunks (n_ops=5, ops=0x7f0054fb6e90, dpif=0x20a77f0) at lib/dpif-netlink.c:2243
#4  dpif_netlink_operate (dpif_=0x20a77f0, ops=0x7f0054fb7e40, n_ops=<optimized out>) at lib/dpif-netlink.c:2276
#5  0x000000000046ecb8 in dpif_operate (dpif=0x20a77f0, ops=ops@entry=0x7f0054fb7e40, n_ops=<optimized out>, n_ops@entry=6) at lib/dpif.c:1355
#6  0x000000000043b90e in handle_upcalls (n_upcalls=4, upcalls=0x7f0054fd9640, udpif=0x20a8c10) at ofproto/ofproto-dpif-upcall.c:1482
#7  recv_upcalls (handler=<optimized out>, handler=<optimized out>) at ofproto/ofproto-dpif-upcall.c:841
#8  0x000000000043bc32 in udpif_upcall_handler (arg=0x2097758) at ofproto/ofproto-dpif-upcall.c:746
#9  0x00000000004dc234 in ovsthread_wrapper (aux_=<optimized out>) at lib/ovs-thread.c:348
#10 0x00007f005fe43609 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f005f613e6f in clone () from /lib64/libc.so.6

When creating a new bridge:

#0  ofproto_create (datapath_name=0x209f120 "br-vxlan2", datapath_type=0x20ad7a0 "system", ofprotop=ofprotop@entry=0x20dd558) at ofproto/ofproto.c:471
#1  0x000000000040bd15 in bridge_reconfigure (ovs_cfg=ovs_cfg@entry=0x20b3c20) at vswitchd/bridge.c:647
#2  0x000000000040fad9 in bridge_run () at vswitchd/bridge.c:2992
#3  0x0000000000406945 in main (argc=<optimized out>, argv=<optimized out>) at vswitchd/ovs-vswitchd.c:119

xbridge_lookup

rule_dpif_lookup_from_table

(gdb) bt
#0  nl_msg_put_flower_options (flower=0x7f56837bbb60, request=0x7f56837bb980) at lib/tc.c:1389
#1  tc_replace_flower (ifindex=ifindex@entry=28, prio=<optimized out>, handle=handle@entry=0, flower=flower@entry=0x7f56837bbb60) at lib/tc.c:1473
#2  0x0000000000523150 in netdev_tc_flow_put (netdev=<optimized out>, match=<optimized out>, actions=<optimized out>, actions_len=<optimized out>, ufid=<optimized out>, info=<optimized out>, stats=<optimized out>)
    at lib/netdev-tc-offloads.c:1025
#3  0x0000000000517112 in parse_flow_put (put=0x7f56837be270, dpif=0x2746b40) at lib/dpif-netlink.c:2139
#4  try_send_to_netdev (op=0x7f56837be268, dpif=0x2746b40) at lib/dpif-netlink.c:2204
#5  dpif_netlink_operate (dpif_=0x2746b40, ops=0x7f56837bce40, n_ops=2) at lib/dpif-netlink.c:2266
#6  0x000000000046ed48 in dpif_operate (dpif=0x2746b40, ops=ops@entry=0x7f56837bce40, n_ops=<optimized out>, n_ops@entry=2) at lib/dpif.c:1355
#7  0x000000000043b94e in handle_upcalls (n_upcalls=1, upcalls=0x7f56837de640, udpif=0x27246e0) at ofproto/ofproto-dpif-upcall.c:1482

#8  recv_upcalls (handler=<optimized out>, handler=<optimized out>) at ofproto/ofproto-dpif-upcall.c:841
#9  0x000000000043bc72 in udpif_upcall_handler (arg=0x2722578) at ofproto/ofproto-dpif-upcall.c:746
#10 0x00000000004dc2c4 in ovsthread_wrapper (aux_=<optimized out>) at lib/ovs-thread.c:348
#11 0x00007f568a49b609 in start_thread () from /lib64/libpthread.so.0
#12 0x00007f5689c6be6f in clone () from /lib64/libc.so.6



#0  compose_output_action__ (ctx=ctx@entry=0x7fdf96dbb010, ofp_port=65534, xr=xr@entry=0x0, check_stp=check_stp@entry=true, mirror=mirror@entry=false) at ofproto/ofproto-dpif-xlate.c:3720
#1  0x000000000044263f in compose_output_action (mirror=false, xr=0x0, ofp_port=<optimized out>, ctx=0x7fdf96dbb010) at ofproto/ofproto-dpif-xlate.c:3892
#2  output_normal (ctx=ctx@entry=0x7fdf96dbb010, out_xbundle=out_xbundle@entry=0x199a410, xvlan=xvlan@entry=0x7fdf96db9a84, mirror=mirror@entry=false) at ofproto/ofproto-dpif-xlate.c:2221
#3  0x0000000000442d3c in xlate_normal_flood (ctx=ctx@entry=0x7fdf96dbb010, in_xbundle=in_xbundle@entry=0x19a10f0, xvlan=xvlan@entry=0x7fdf96db9a84) at ofproto/ofproto-dpif-xlate.c:2620
#4  0x000000000044614d in xlate_normal (ctx=0x7fdf96dbb010) at ofproto/ofproto-dpif-xlate.c:2837
#5  xlate_output_action (ctx=ctx@entry=0x7fdf96dbb010, port=<optimized out>, max_len=<optimized out>, may_packet_in=may_packet_in@entry=true) at ofproto/ofproto-dpif-xlate.c:4857
#6  0x0000000000444656 in do_xlate_actions (ofpacts=ofpacts@entry=0x199b068, ofpacts_len=ofpacts_len@entry=16, ctx=ctx@entry=0x7fdf96dbb010) at ofproto/ofproto-dpif-xlate.c:6192
#7  0x0000000000448a8c in xlate_actions (xin=xin@entry=0x7fdf96dbba80, xout=xout@entry=0x7fdf96ddd6a0) at ofproto/ofproto-dpif-xlate.c:7098
#8  0x000000000043a9d4 in upcall_xlate (wc=0x7fdf96ddd6f8, odp_actions=0x7fdf96ddd6b8, upcall=0x7fdf96ddd640, udpif=0x19696e0) at ofproto/ofproto-dpif-upcall.c:1153
#9  process_upcall (udpif=udpif@entry=0x19696e0, upcall=upcall@entry=0x7fdf96ddd640, odp_actions=odp_actions@entry=0x7fdf96ddd6b8, wc=wc@entry=0x7fdf96ddd6f8) at ofproto/ofproto-dpif-upcall.c:1347

#10 0x000000000043b6e3 in recv_upcalls (handler=<optimized out>, handler=<optimized out>) at ofproto/ofproto-dpif-upcall.c:824
#11 0x000000000043bc72 in udpif_upcall_handler (arg=0x1967578) at ofproto/ofproto-dpif-upcall.c:746
#12 0x00000000004dc2c4 in ovsthread_wrapper (aux_=<optimized out>) at lib/ovs-thread.c:348
#13 0x00007fdf99577609 in start_thread () from /lib64/libpthread.so.0
#14 0x00007fdf98d47e6f in clone () from /lib64/libc.so.6

DPIF_UC_MISS
MISS_UPCALL

struct udpif_key

put_op_init
DPIF_OP_FLOW_PUT

linux_get_ifindex

nl_msg_put_flower_acts

xlate_cache_clear_entry

parse_tc_flower_to_match
netdev_tc_flow_put

 0x7f4fab65e7e4 : sendmsg    +0x54/0xb0 [/usr/lib64/libpthread-2.26.so]
 0x525ab1 : nl_sock_transact_multiple__    +0x121/0x490 [/usr/sbin/ovs-vswitchd]
 0x525edc : nl_sock_transact_multiple.part.8    +0xbc/0x1a0 [/usr/sbin/ovs-vswitchd]
 0x526001 : nl_sock_transact    +0x41/0xc0 [/usr/sbin/ovs-vswitchd]
 0x526e30 : nl_transact    +0x40/0x60 [/usr/sbin/ovs-vswitchd]
 0x528a5e : tc_replace_flower    +0x26e/0xa90 [/usr/sbin/ovs-vswitchd]
 0x523668 : netdev_tc_flow_put    +0xaf8/0x1210 [/usr/sbin/ovs-vswitchd]
 0x517712 : dpif_netlink_operate   .part.29    +0x222/0x560 [/usr/sbin/ovs-vswitchd]
 0x46f438 : dpif_operate    +0xa8/0x260 [/usr/sbin/ovs-vswitchd]
 0x43ba5e : recv_upcalls.isra.22    +0x6ee/0x950 [/usr/sbin/ovs-vswitchd]
 0x43bd02 : udpif_upcall_handler    +0x42/0x70 [/usr/sbin/ovs-vswitchd]
 0x4dc5e4 : ovsthread_wrapper    +0x64/0x70 [/usr/sbin/ovs-vswitchd]
 0x7f4fab653609 : start_thread    +0xd9/0x3b0 [/usr/lib64/libpthread-2.26.so]
 0x7f4faae23e6f : clone    +0x3f/0x60 [/usr/lib64/libc-2.26.so]

do_open
	netdev_open
	netdev_ports_insert

miniflow_extract

compose_output_action__

OVS_ACTION_ATTR_OUTPUT

dp_netdev_flow

mirror_ingress_packet
mirror_packet
mirror_get

struct ofbundle
	aux is the pointer of struct port

===skills===

p *largv@5
$22 = {0x6728c0 "qdisc", 0x6728c6 "add", 0x6728ca "dev", 0x6728ce "enp4s0f0", 0x6728d7 "ingress"}

ptype struct xport

set logging on
show commands

p &((struct xbundle*)0)->list_node
$7 = (struct ovs_list *) 0x18

p &((struct xport*)0)->bundle_node
$34 = (struct ovs_list *) 0x30

p/x (*(struct xlate_cfg*) xcfgp)->xports
$11 = {
  buckets = 0x1783890,
  one = 0x0,
  mask = 0x3,
  n = 0x4
}

p/x (*(struct xlate_cfg*) xcfgp)->xbundles.buckets


p (*(struct xlate_cfg*) xcfgp)->xbridges.one
p (*(struct xbridge *) 0x177ce80 ).xbundles.prev
set $node = 0x1722198
p *(struct xbundle *) ($node - 0x18)
p *(struct xbundle *) (($node = *$node) - 0x18)

0x1785cd0
0x177fd10
0x173db90
0x1784b90

===struct xlate_cfg===


p/x *(struct xlate_cfg*) xcfgp

$11 = {
  xbridges = {
    buckets = 0x26d5208,
    one = 0x26d35d0,
    mask = 0x0,
    n = 0x1
  },
  xbundles = {
    buckets = 0x2719640,
    one = 0x0,
    mask = 0x3,
    n = 0x4
  },
  xports = {
    buckets = 0x26d6a70,
    one = 0x0,
    mask = 0x3,
    n = 0x4
  }
}
(gdb) x/12 0x26dd5c0
0x26dd5c0:      0x02722f70      0x00000000      0x026c0040      0x00000000
0x26dd5d0:      0x026d1750      0x00000000      0x026e6210      0x00000000
0x26dd5e0:      0x026d6070      0x00000000      0x00000031      0x00000000
(gdb) p *(struct xbundle *) 0x026c0040
$5 = {
  hmap_node = {
    hash = 1643999145,
    next = 0x0
  },
  ofbundle = 0x26e9650,
  list_node = {
    prev = 0x2722f88,
    next = 0x26e6228
  },
  xbridge = 0x26bac40,
  xports = {
    prev = 0x26c2120,
    next = 0x26c2120
  },
  name = 0x271e930 "enp4s0f0",
  bond = 0x0,
  lacp = 0x0,
  vlan_mode = PORT_VLAN_TRUNK,
  qinq_ethtype = 34984,
  vlan = -1,
  trunks = 0x0,
  cvlans = 0x0,
  use_priority_tags = false,
  floodable = true,
  protected = false
}
(gdb)  p *(struct ofbundle *) 0x26e9650
$12 = {
  hmap_node = {
    hash = 2712193135,
    next = 0x26e6b60
  },
  ofproto = 0x26df080,
  aux = 0x26ec8b0,
  name = 0x26d1e40 "enp4s0f0",
  ports = {
    prev = 0x26bfa60,
    next = 0x26bfa60
  },
  vlan_mode = PORT_VLAN_TRUNK,
  qinq_ethtype = 34984,
  vlan = -1,
  trunks = 0x0,
  cvlans = 0x0,
  lacp = 0x0,
  bond = 0x0,
  use_priority_tags = false,
  protected = false,
  floodable = true
}
(gdb) p *(struct ofproto_dpif *) 0x26df080
$10 = {
  all_ofproto_dpifs_node = {
    hash = 24776443,
    next = 0x0
  },
  up = {
    hmap_node = {
      hash = 24776443,
      next = 0x0
    },
    ofproto_class = 0x5648e0 <ofproto_dpif_class>,
    type = 0x26ea840 "system",
    name = 0x26ea8e0 "br1",
    fallback_dpid = 150874258214,
    datapath_id = 40175250450378,
    forward_bpdu = false,
    mfr_desc = 0x0,
    hw_desc = 0x0,
    sw_desc = 0x0,
    serial_desc = 0x0,
    dp_desc = 0x0,
    frag_handling = OFPUTIL_FRAG_NORMAL,
    ports = {
      buckets = 0x26bf870,
      one = 0x0,
      mask = 3,
      n = 4
    },
    port_by_name = {
      map = {
        buckets = 0x26bf8d0,
        one = 0x0,
        mask = 3,
        n = 4
      }
    },
    ofp_requests = {
      map = {
        buckets = 0x26bf690,
        one = 0x0,
        mask = 3,
        n = 4
      }
    },
    alloc_port_no = 3,
    max_ports = 65280,
    ofport_usage = {
      buckets = 0x26bf6f0,
      one = 0x0,
      mask = 3,
      n = 3
    },
    change_seq = 654,
    eviction_group_timer = 78586689,
    tables = 0x26f0670,
    n_tables = 255,
    tables_version = 6,
    cookies = {
      buckets = 0x26df1b8,
      one = 0x26be650,
      mask = 0,
      n_unique = 1
    },
    learned_cookies = {
      buckets = 0x26df1d8,
      one = 0x0,
      mask = 0,
      n = 0
    },
    expirable = {                                                                                                                                                                                                                     [143/1905]
      prev = 0x26df1f0,
---Type <return> to continue, or q <return> to quit---
      next = 0x26df1f0
    },
    meter_features = {
      max_meters = 0,
      band_types = 0,
      capabilities = 0,
      max_bands = 0 '\000',
      max_color = 0 '\000'
    },
    meters = {
      buckets = 0x26df218,
      one = 0x0,
      mask = 0,
      n = 0
    },
    slowpath_meter_id = 4294967295,
    controller_meter_id = 4294967295,
    connmgr = 0x26e5fe0,
    min_mtu = 1500,
    groups = {
      impl = {
        p = 0x831140 <empty_cmap>
      }
    },
    n_groups = {0, 0, 0, 0},
    ogf = {
      types = 15,
      capabilities = 7,
      max_groups = {4294967040, 4294967040, 4294967040, 4294967040},
      ofpacts = {36028797018963967, 36028797018963967, 36028797018963967, 36028797018963967}
    },
    metadata_tab = {
      p = 0x26e0e60
    },
    vl_mff_map = {
      cmap = {
        impl = {
          p = 0x831140 <empty_cmap>
        }
      },
      mutex = {
        lock = {
          __data = {
            __lock = 0,
            __count = 0,
            __owner = 0,
            __nusers = 0,
            __kind = 2,
            __spins = 0,
            __elision = 0,
            __list = {
              __prev = 0x0,
              __next = 0x0
            }
          },
          __size = '\000' <repeats 16 times>, "\002", '\000' <repeats 22 times>,
          __align = 0
        },
        where = 0x55ea11 "<unlocked>"
      }
    }
  },
  backer = 0x26e1f40,
  uuid = {
    parts = {3278766937, 2189183717, 2613084806, 3041916598}
  },
  tables_version = 6,
  dump_seq = 753723,
  miss_rule = 0x26be5d0,
  no_packet_in_rule = 0x26bec00,
  drop_frags_rule = 0x26bedf0,
---Type <return> to continue, or q <return> to quit---
  netflow = 0x0,
  sflow = 0x0,
  ipfix = 0x0,
  bundles = {
    buckets = 0x26ea660,
    one = 0x0,
    mask = 3,
    n = 4
  },
  ml = 0x26c43a0,
  ms = 0x0,
  has_bonded_bundles = false,
  lacp_enabled = false,
  mbridge = 0x26c4480,
  stats_mutex = {
    lock = {
      __data = {
        __lock = 0,
        __count = 0,
        __owner = 0,
        __nusers = 0,
        __kind = 3,
        __spins = 0,
        __elision = 0,
        __list = {
          __prev = 0x0,
          __next = 0x0
        }
      },
      __size = '\000' <repeats 16 times>, "\003", '\000' <repeats 22 times>,
      __align = 0
    },
    where = 0x55ea11 "<unlocked>"
  },
  stats = {
    rx_packets = 0,
    tx_packets = 0,
    rx_bytes = 0,
    tx_bytes = 0,
    rx_errors = 0,
    tx_errors = 0,
    rx_dropped = 0,
    tx_dropped = 0,
    multicast = 0,
    collisions = 0,
    rx_length_errors = 0,
    rx_over_errors = 0,
    rx_crc_errors = 0,
    rx_frame_errors = 0,
    rx_fifo_errors = 0,
    rx_missed_errors = 0,
    tx_aborted_errors = 0,
    tx_carrier_errors = 0,
    tx_fifo_errors = 0,
    tx_heartbeat_errors = 0,
    tx_window_errors = 0,
    rx_1_to_64_packets = 0,
    rx_65_to_127_packets = 0,
    rx_128_to_255_packets = 0,
    rx_256_to_511_packets = 0,
    rx_512_to_1023_packets = 0,
    rx_1024_to_1522_packets = 0,
    rx_1523_to_max_packets = 0,
    tx_1_to_64_packets = 0,
    tx_65_to_127_packets = 0,
    tx_128_to_255_packets = 0,
    tx_256_to_511_packets = 0,
    tx_512_to_1023_packets = 0,
    tx_1024_to_1522_packets = 0,
    tx_1523_to_max_packets = 0,
    tx_multicast_packets = 0,
---Type <return> to continue, or q <return> to quit---
    rx_broadcast_packets = 0,
    tx_broadcast_packets = 0,
    rx_undersized_errors = 0,
    rx_oversize_errors = 0,
    rx_fragmented_errors = 0,
    rx_jabber_errors = 0
  },
  stp = 0x0,
  stp_last_tick = 0,
  rstp = 0x0,
  rstp_last_tick = 0,
  ports = {
    map = {
      buckets = 0x26c45d0,
      one = 0x0,
      mask = 3,
      n = 4
    }
  },
  ghost_ports = {
    map = {
      buckets = 0x26df538,
      one = 0x0,
      mask = 0,
      n = 0
    }
  },
  port_poll_set = {
    map = {
      buckets = 0x26df558,
      one = 0x0,
      mask = 0,
      n = 0
    }
  },
  port_poll_errno = 0,
  change_seq = 654,
  ams = {
    mutex = {
      lock = {
        __data = {
          __lock = 0,
          __count = 0,
          __owner = 0,
          __nusers = 0,
          __kind = 2,
          __spins = 0,
          __elision = 0,
          __list = {
            __prev = 0x0,
            __next = 0x0
          }
        },
        __size = '\000' <repeats 16 times>, "\002", '\000' <repeats 22 times>,
        __align = 0
      },
      where = 0x55ea11 "<unlocked>"
    },
    list = {
      prev = 0x26df5b0,
      next = 0x26df5b0
    },
    n = 0
  },
  ams_seq = 0x26bc830,
  ams_seqno = 120
}
===port_to_netdev===

(gdb) p port_to_netdev
$1 = {
  buckets = 0x26ea9d0,
  one = 0x0,
  mask = 3,
  n = 3
}
(gdb) x/10 0x26ea9d0
0x26ea9d0:      0x00000000      0x00000000      0x026bc440      0x00000000
0x26ea9e0:      0x026e7820      0x00000000      0x026eccf0      0x00000000
0x26ea9f0:      0x00000030      0x00000000
(gdb) print/x *(struct port_to_netdev_data *) 0x026bc440
$2 = {
  node = {
    hash = 0xfda052dd,
    next = 0x0
  },
  netdev = 0x26bbd60,
  dpif_port = {
    name = 0x26e92f0,
    type = 0x26e92a0,
    port_no = 0x2
  },
  dpif_class = 0x597d80
}
(gdb) print/x *(struct port_to_netdev_data *) 0x026e7820
$3 = {
  node = {
    hash = 0x3c461a7e,
    next = 0x0
  },
  netdev = 0x26e5df0,
  dpif_port = {
    name = 0x26e7880,
    type = 0x26e78a0,
    port_no = 0x4
  },
  dpif_class = 0x597d80
}
(gdb) print/x *(struct port_to_netdev_data *) 0x026eccf0
$4 = {
  node = {
    hash = 0x603a011f,
    next = 0x0
  },
  netdev = 0x26de860,
  dpif_port = {
    name = 0x26e9170,
    type = 0x26e9120,
    port_no = 0x3
  },
  dpif_class = 0x597d80
}
(gdb) x/s 0x26e92f0
0x26e92f0:      "enp4s0f0"
(gdb) x/s 0x26e92a0
0x26e92a0:      "system"
(gdb) x/s 0x26e7880
0x26e7880:      "enp4s0f0_0"
(gdb) x/s 0x26e9170
0x26e9170:      "enp4s0f0_1"
(gdb) p/x *(struct netdev *) 0x26bbd60
$6 = {
  name = 0x26eaa20,
  netdev_class = 0x59a620,
  auto_classified = 0x1,
  change_seq = 0x2,
  reconfigure_seq = 0x26e9580,
  last_reconfigure_seq = 0x16,
  mtu_user_config = 0x0,
  n_txq = 0x1,
  n_rxq = 0x1,
  ref_cnt = 0x5,
  node = 0x26e9a50,
  saved_flags_list = {
    prev = 0x26bbda8,
    next = 0x26bbda8
  }
}
(gdb) p/s *( struct netdev_class *) 0x59a620
$8 = {
  type = 0x55fdbd "system",
  is_pmd = false,
  init = 0x0,
  run = 0x51e810 <netdev_linux_run>,
  wait = 0x51e6d0 <netdev_linux_wait>,
  alloc = 0x519eb0 <netdev_linux_alloc>,
  construct = 0x51d800 <netdev_linux_construct>,
  destruct = 0x51bdd0 <netdev_linux_destruct>,
  dealloc = 0x51b0d0 <netdev_linux_dealloc>,
  get_config = 0x0,
  set_config = 0x0,
  get_tunnel_config = 0x0,
  build_header = 0x0,
  push_header = 0x0,
  pop_header = 0x0,
  get_numa_id = 0x0,
  set_tx_multiq = 0x0,
  send = 0x51da20 <netdev_linux_send>,
  send_wait = 0x51a9e0 <netdev_linux_send_wait>,
  set_etheraddr = 0x51bb90 <netdev_linux_set_etheraddr>,
  get_etheraddr = 0x51b560 <netdev_linux_get_etheraddr>,
  get_mtu = 0x51b3a0 <netdev_linux_get_mtu>,
  set_mtu = 0x51b2d0 <netdev_linux_set_mtu>,
  get_ifindex = 0x521710 <netdev_linux_get_ifindex>,
  get_carrier = 0x51b250 <netdev_linux_get_carrier>,
  get_carrier_resets = 0x51b200 <netdev_linux_get_carrier_resets>,
  set_miimon_interval = 0x51bad0 <netdev_linux_set_miimon_interval>,
  get_stats = 0x51e090 <netdev_linux_get_stats>,
  get_features = 0x51c730 <netdev_linux_get_features>,
  set_advertisements = 0x51b400 <netdev_linux_set_advertisements>,
  get_pt_mode = 0x0,
  set_policing = 0x521310 <netdev_linux_set_policing>,
  get_qos_types = 0x51a980 <netdev_linux_get_qos_types>,
  get_qos_capabilities = 0x51a550 <netdev_linux_get_qos_capabilities>,
  get_qos = 0x51f9f0 <netdev_linux_get_qos>,
  set_qos = 0x51fb20 <netdev_linux_set_qos>,
  get_queue = 0x51f950 <netdev_linux_get_queue>,
  set_queue = 0x51f8c0 <netdev_linux_set_queue>,
  delete_queue = 0x51f820 <netdev_linux_delete_queue>,
  get_queue_stats = 0x51f770 <netdev_linux_get_queue_stats>,
  queue_dump_start = 0x51f630 <netdev_linux_queue_dump_start>,
  queue_dump_next = 0x51e440 <netdev_linux_queue_dump_next>,
  queue_dump_done = 0x519dc0 <netdev_linux_queue_dump_done>,
  dump_queue_stats = 0x520ff0 <netdev_linux_dump_queue_stats>,
  set_in4 = 0x51b170 <netdev_linux_set_in4>,
  get_addr_list = 0x51b830 <netdev_linux_get_addr_list>,
  add_router = 0x519f90 <netdev_linux_add_router>,
  get_next_hop = 0x51a1d0 <netdev_linux_get_next_hop>,
  get_status = 0x51b720 <netdev_linux_get_status>,
  arp_lookup = 0x51a060 <netdev_linux_arp_lookup>,
  update_flags = 0x51b100 <netdev_linux_update_flags>,
  reconfigure = 0x0,
  rxq_alloc = 0x519e90 <netdev_linux_rxq_alloc>,
  rxq_construct = 0x51f120 <netdev_linux_rxq_construct>,
  rxq_destruct = 0x51ace0 <netdev_linux_rxq_destruct>,
  rxq_dealloc = 0x51acc0 <netdev_linux_rxq_dealloc>,
  rxq_recv = 0x51c0a0 <netdev_linux_rxq_recv>,
  rxq_wait = 0x51aca0 <netdev_linux_rxq_wait>,
  rxq_drain = 0x51ac20 <netdev_linux_rxq_drain>,
  flow_flush = 0x5222b0 <netdev_tc_flow_flush>,
  flow_dump_create = 0x522320 <netdev_tc_flow_dump_create>,
  flow_dump_destroy = 0x5223e0 <netdev_tc_flow_dump_destroy>,
  flow_dump_next = 0x522410 <netdev_tc_flow_dump_next>,
  flow_put = 0x522650 <netdev_tc_flow_put>,
  flow_get = 0x5238a0 <netdev_tc_flow_get>,
  flow_del = 0x523a80 <netdev_tc_flow_del>,
  init_flow_api = 0x523b70 <netdev_tc_init_flow_api>
}


===flow===

  subtables = {
    impl = {
      p = 0x914110
    },
    temp = 0x0
  },
  partitions = {
    impl = {
      p = 0x0
    }
  },
  tries = {{
      field = 0x574be0 <mf_fields+7616>,
      root = {
        p = 0x0
      }
    }, {
      field = 0x574ba8 <mf_fields+7560>,
      root = {
        p = 0x0
      }
    }, {
      field = 0x0,
      root = {
        p = 0x0
      }
    }},
  n_tries = 2,
  publish = true
}
struct subtable $48 = (struct pvector_impl *) 0x914110
$49 = {
  size = 0x2,
  allocated = 0x5,
  vector = 0x914120
}
(gdb) p/x *(struct pvector_entry*) 0x914120
$51 = {
  priority = 0x8000,
  ptr = 0x8c31e0
}
(gdb) p/x *(struct cls_subtable*) 0x8c31e0
$52 = {
  cmap_node = {


(gdb) x/100 0x1f4cba0
0x1f4cba0:      0x00000000      0x0c400000      0x00000000      0x00000000
0x1f4cbb0:      0x00000000      0x00000000      0x88078a24      0x25029a27
0x1f4cbc0:      0x020113d0      0x00000000      0x00000000      0x0c400000
0x1f4cbd0:      0x00000000      0x00000000      0x00000000      0xffffffff
0x1f4cbe0:      0xffffffff      0xffffffff      0xffffffff      0x00000000
0x1f4cbf0:      0x00000067      0x00000001      0x00000101      0x00000000
0x1f4cc00:      0x01f4e0e0      0x00000000      0x00000111      0x00000000
0x1f4cc10:      0x01f5c1b0      0x00000000      0x70616d22      0x5b5b2c22
0x1f4cc20:      0x000000d0      0x00000000      0x000000d0      0x00000000
0x1f4cc30:      0x00000000      0x00000000      0x01f4b1f0      0x00000000
0x1f4cc40:      0x00000000      0x00000000      0x00000000      0x00000000
0x1f4cc50:      0x00000000      0x00000000      0x00000000      0x00000000
0x1f4cc60:      0x0000468a      0x00000000      0x01f44610      0x00000000
0x1f4cc70:      0x00000000      0x00000000      0x00000041      0x00000000
0x1f4cc80:      0x00000000      0x00000000      0x00000000      0x00000000
0x1f4cc90:      0x00000000      0x00000000      0x72225b2c      0x72635f78
0x1f4cca0:      0x00000000      0x00000000      0x31346134      0x5d226163
0x1f4ccb0:      0x00000000      0x00000000      0x5f726576      0x22727265
0x1f4ccc0:      0x00000000      0x00000000      0x00001c91      0x00000000
0x1f4ccd0:      0x00000000      0x00000000      0x00000002      0xffffffff
0x1f4cce0:      0x01f48c70      0x00000000      0x01f4b170      0x00000000
0x1f4ccf0:      0x00000110      0x00000000      0x000000d1      0x00000000
0x1f4cd00:      0x00000000      0x00000000      0x0000000a      0x00000001
0x1f4cd10:      0x01f8f528      0x00000000      0x01f8f528      0x00000000
0x1f4cd20:      0x00000001      0x00000000      0x00000000      0x00400000


(gdb) p/x *(struct rule_actions *)0x1f42cd0
$51 = {
  has_meter = 0x0,
  has_learn_with_delete = 0x0,
  has_groups = 0x0,
  ofpacts_len = 0x10,
  ofpacts = 0x1f42cd8
}
(gdb) x/10 0x1f42cd8
0x1f42cd8:      0x0010ff00      0x0000fffa      0x00000000      0x00000000
0x1f42ce8:      0x00000031      0x00000000      0x01f97ab8      0x00000000
0x1f42cf8:      0x01fa1588      0x00000000

(gdb) p/x *(struct ofpact_output*) 0x1f42cd8
$54 = {
  ofpact = {
    type = 0x0,
    raw = 0xff,
    len = 0x10
  },
  port = 0xfffa,
  max_len = 0x0
}

#define OFPP_NORMAL     OFP_PORT_C(0xfffa) /* Process with normal L2/L3. */

#define OFPP_LOCAL      OFP_PORT_C(0xfffe) /* Local openflow "port". */

drop means no action, ofpacts_len is 0.

#define OFPACTS                                                         \
    /* Output. */                                                       \
    OFPACT(OUTPUT,          ofpact_output,      ofpact, "output")       \
    OFPACT(GROUP,           ofpact_group,       ofpact, "group")        \
    OFPACT(CONTROLLER,      ofpact_controller,  userdata, "controller") \
    OFPACT(ENQUEUE,         ofpact_enqueue,     ofpact, "enqueue")      \
    OFPACT(OUTPUT_REG,      ofpact_output_reg,  ofpact, "output_reg")   \
    OFPACT(BUNDLE,          ofpact_bundle,      slaves, "bundle")       \
                                                                        \