On 2/1/2015 12:02 PM, Tetsuya Mukawa wrote:
> The patch introduces following commands.
> - port attach [ident]
> - port detach [port_id]
>  - attach: attaching a port
>  - detach: detaching a port
>  - ident: pci address of physical device.
>           Or device name and paramerters of virtual device.
>          (ex. 0000:02:00.0, eth_pcap0,iface=eth0)
>  - port_id: port identifier
>
> v5:
> - Add testpmd documentation.
>   (Thanks to Iremonger, Bernard)
> v4:
>  - Fix strings of command help.
>
> Signed-off-by: Tetsuya Mukawa <mukawa at igel.co.jp>
> ---
>  app/test-pmd/cmdline.c                      | 133 +++++++++++++++----
>  app/test-pmd/config.c                       | 116 +++++++++-------
>  app/test-pmd/parameters.c                   |  22 ++-
>  app/test-pmd/testpmd.c                      | 199 
> +++++++++++++++++++++-------
>  app/test-pmd/testpmd.h                      |  18 ++-
>  doc/guides/testpmd_app_ug/testpmd_funcs.rst |  57 ++++++++
>  6 files changed, 415 insertions(+), 130 deletions(-)
>
> diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
> index 4beb404..2f813d8 100644
> --- a/app/test-pmd/cmdline.c
> +++ b/app/test-pmd/cmdline.c
> @@ -572,6 +572,12 @@ static void cmd_help_long_parsed(void *parsed_result,
>                       "port close (port_id|all)\n"
>                       "    Close all ports or port_id.\n\n"
>  
> +                     "port attach (ident)\n"
> +                     "    Attach physical or virtual dev by pci address or 
> virtual device name\n\n"
> +
> +                     "port detach (port_id)\n"
> +                     "    Detach physical or virtual dev by port_id\n\n"
> +
>                       "port config (port_id|all)"
>                       " speed (10|100|1000|10000|40000|auto)"
>                       " duplex (half|full|auto)\n"
> @@ -848,6 +854,89 @@ cmdline_parse_inst_t cmd_operate_specific_port = {
>       },
>  };
>  
> +/* *** attach a specificied port *** */
> +struct cmd_operate_attach_port_result {
> +     cmdline_fixed_string_t port;
> +     cmdline_fixed_string_t keyword;
> +     cmdline_fixed_string_t identifier;
> +};
> +
> +static void cmd_operate_attach_port_parsed(void *parsed_result,
> +                             __attribute__((unused)) struct cmdline *cl,
> +                             __attribute__((unused)) void *data)
> +{
> +     struct cmd_operate_attach_port_result *res = parsed_result;
> +
> +     if (!strcmp(res->keyword, "attach"))
> +             attach_port(res->identifier);
> +     else
> +             printf("Unknown parameter\n");
> +}
> +
> +cmdline_parse_token_string_t cmd_operate_attach_port_port =
> +     TOKEN_STRING_INITIALIZER(struct cmd_operate_attach_port_result,
> +                     port, "port");
> +cmdline_parse_token_string_t cmd_operate_attach_port_keyword =
> +     TOKEN_STRING_INITIALIZER(struct cmd_operate_attach_port_result,
> +                     keyword, "attach");
> +cmdline_parse_token_string_t cmd_operate_attach_port_identifier =
> +     TOKEN_STRING_INITIALIZER(struct cmd_operate_attach_port_result,
> +                     identifier, NULL);
> +
> +cmdline_parse_inst_t cmd_operate_attach_port = {
> +     .f = cmd_operate_attach_port_parsed,
> +     .data = NULL,
> +     .help_str = "port attach identifier, "
> +             "identifier: pci address or virtual dev name",
> +     .tokens = {
> +             (void *)&cmd_operate_attach_port_port,
> +             (void *)&cmd_operate_attach_port_keyword,
> +             (void *)&cmd_operate_attach_port_identifier,
> +             NULL,
> +     },
> +};
> +
> +/* *** detach a specificied port *** */
> +struct cmd_operate_detach_port_result {
> +     cmdline_fixed_string_t port;
> +     cmdline_fixed_string_t keyword;
> +     uint8_t port_id;
> +};
> +
> +static void cmd_operate_detach_port_parsed(void *parsed_result,
> +                             __attribute__((unused)) struct cmdline *cl,
> +                             __attribute__((unused)) void *data)
> +{
> +     struct cmd_operate_detach_port_result *res = parsed_result;
> +
> +     if (!strcmp(res->keyword, "detach"))
> +             detach_port(res->port_id);
> +     else
> +             printf("Unknown parameter\n");
> +}
> +
> +cmdline_parse_token_string_t cmd_operate_detach_port_port =
> +     TOKEN_STRING_INITIALIZER(struct cmd_operate_detach_port_result,
> +                     port, "port");
> +cmdline_parse_token_string_t cmd_operate_detach_port_keyword =
> +     TOKEN_STRING_INITIALIZER(struct cmd_operate_detach_port_result,
> +                     keyword, "detach");
> +cmdline_parse_token_num_t cmd_operate_detach_port_port_id =
> +     TOKEN_NUM_INITIALIZER(struct cmd_operate_detach_port_result,
> +                     port_id, UINT8);
> +
> +cmdline_parse_inst_t cmd_operate_detach_port = {
> +     .f = cmd_operate_detach_port_parsed,
> +     .data = NULL,
> +     .help_str = "port detach port_id",
> +     .tokens = {
> +             (void *)&cmd_operate_detach_port_port,
> +             (void *)&cmd_operate_detach_port_keyword,
> +             (void *)&cmd_operate_detach_port_port_id,
> +             NULL,
> +     },
> +};
> +
>  /* *** configure speed for all ports *** */
>  struct cmd_config_speed_all {
>       cmdline_fixed_string_t port;
> @@ -902,7 +991,7 @@ cmd_config_speed_all_parsed(void *parsed_result,
>               return;
>       }
>  
> -     for (pid = 0; pid < nb_ports; pid++) {
> +     FOREACH_PORT(pid, ports) {
>               ports[pid].dev_conf.link_speed = link_speed;
>               ports[pid].dev_conf.link_duplex = link_duplex;
>       }
> @@ -970,10 +1059,8 @@ cmd_config_speed_specific_parsed(void *parsed_result,
>               return;
>       }
>  
> -     if (res->id >= nb_ports) {
> -             printf("Port id %d must be less than %d\n", res->id, nb_ports);
> +     if (port_id_is_invalid(res->id, ENABLED_WARN))
>               return;
> -     }
>  
>       if (!strcmp(res->value1, "10"))
>               link_speed = ETH_LINK_SPEED_10;
> @@ -1533,7 +1620,7 @@ cmd_config_rxtx_queue_parsed(void *parsed_result,
>               return;
>       }
>  
> -     if (port_id_is_invalid(res->portid))
> +     if (port_id_is_invalid(res->portid, ENABLED_WARN))
>               return;
>  
>       if (port_is_started(res->portid) != 1) {
> @@ -2876,7 +2963,7 @@ cmd_tx_cksum_parsed(void *parsed_result,
>       uint16_t ol_flags, mask = 0;
>       struct rte_eth_dev_info dev_info;
>  
> -     if (port_id_is_invalid(res->port_id)) {
> +     if (port_id_is_invalid(res->port_id, ENABLED_WARN)) {
>               printf("invalid port %d\n", res->port_id);
>               return;
>       }
> @@ -3003,7 +3090,7 @@ cmd_tso_set_parsed(void *parsed_result,
>       struct cmd_tso_set_result *res = parsed_result;
>       struct rte_eth_dev_info dev_info;
>  
> -     if (port_id_is_invalid(res->port_id))
> +     if (port_id_is_invalid(res->port_id, ENABLED_WARN))
>               return;
>  
>       if (!strcmp(res->mode, "set"))
> @@ -3979,10 +4066,8 @@ static void cmd_set_bond_mac_addr_parsed(void 
> *parsed_result,
>       struct cmd_set_bond_mac_addr_result *res = parsed_result;
>       int ret;
>  
> -     if (res->port_num >= nb_ports) {
> -             printf("Port id %d must be less than %d\n", res->port_num, 
> nb_ports);
> +     if (port_id_is_invalid(res->port_num, ENABLED_WARN))
>               return;
> -     }
>  
>       ret = rte_eth_bond_mac_address_set(res->port_num, &res->address);
>  
> @@ -4219,7 +4304,7 @@ static void cmd_set_promisc_mode_parsed(void 
> *parsed_result,
>  
>       /* all ports */
>       if (allports) {
> -             for (i = 0; i < nb_ports; i++) {
> +             FOREACH_PORT(i, ports) {
>                       if (enable)
>                               rte_eth_promiscuous_enable(i);
>                       else
> @@ -4299,7 +4384,7 @@ static void cmd_set_allmulti_mode_parsed(void 
> *parsed_result,
>  
>       /* all ports */
>       if (allports) {
> -             for (i = 0; i < nb_ports; i++) {
> +             FOREACH_PORT(i, ports) {
>                       if (enable)
>                               rte_eth_allmulticast_enable(i);
>                       else
> @@ -5484,25 +5569,25 @@ static void cmd_showportall_parsed(void 
> *parsed_result,
>       struct cmd_showportall_result *res = parsed_result;
>       if (!strcmp(res->show, "clear")) {
>               if (!strcmp(res->what, "stats"))
> -                     for (i = 0; i < nb_ports; i++)
> +                     FOREACH_PORT(i, ports)
>                               nic_stats_clear(i);
>               else if (!strcmp(res->what, "xstats"))
> -                     for (i = 0; i < nb_ports; i++)
> +                     FOREACH_PORT(i, ports)
>                               nic_xstats_clear(i);
>       } else if (!strcmp(res->what, "info"))
> -             for (i = 0; i < nb_ports; i++)
> +             FOREACH_PORT(i, ports)
>                       port_infos_display(i);
>       else if (!strcmp(res->what, "stats"))
> -             for (i = 0; i < nb_ports; i++)
> +             FOREACH_PORT(i, ports)
>                       nic_stats_display(i);
>       else if (!strcmp(res->what, "xstats"))
> -             for (i = 0; i < nb_ports; i++)
> +             FOREACH_PORT(i, ports)
>                       nic_xstats_display(i);
>       else if (!strcmp(res->what, "fdir"))
> -             for (i = 0; i < nb_ports; i++)
> +             FOREACH_PORT(i, ports)
>                       fdir_get_infos(i);
>       else if (!strcmp(res->what, "stat_qmap"))
> -             for (i = 0; i < nb_ports; i++)
> +             FOREACH_PORT(i, ports)
>                       nic_stats_mapping_display(i);
>  }
>  
> @@ -8756,6 +8841,8 @@ cmdline_parse_ctx_t main_ctx[] = {
>       (cmdline_parse_inst_t *)&cmd_set_qmap,
>       (cmdline_parse_inst_t *)&cmd_operate_port,
>       (cmdline_parse_inst_t *)&cmd_operate_specific_port,
> +     (cmdline_parse_inst_t *)&cmd_operate_attach_port,
> +     (cmdline_parse_inst_t *)&cmd_operate_detach_port,
>       (cmdline_parse_inst_t *)&cmd_config_speed_all,
>       (cmdline_parse_inst_t *)&cmd_config_speed_specific,
>       (cmdline_parse_inst_t *)&cmd_config_rx_tx,
> @@ -8830,7 +8917,7 @@ prompt(void)
>  static void
>  cmd_reconfig_device_queue(portid_t id, uint8_t dev, uint8_t queue)
>  {
> -     if (id < nb_ports) {
> +     if (!port_id_is_invalid(id, DISABLED_WARN)) {
>               /* check if need_reconfig has been set to 1 */
>               if (ports[id].need_reconfig == 0)
>                       ports[id].need_reconfig = dev;
> @@ -8840,7 +8927,7 @@ cmd_reconfig_device_queue(portid_t id, uint8_t dev, 
> uint8_t queue)
>       } else {
>               portid_t pid;
>  
> -             for (pid = 0; pid < nb_ports; pid++) {
> +             FOREACH_PORT(pid, ports) {
>                       /* check if need_reconfig has been set to 1 */
>                       if (ports[pid].need_reconfig == 0)
>                               ports[pid].need_reconfig = dev;
> @@ -8858,10 +8945,8 @@ bypass_is_supported(portid_t port_id)
>       struct rte_port   *port;
>       struct rte_pci_id *pci_id;
>  
> -     if (port_id >= nb_ports) {
> -             printf("\tPort id must be less than %d.\n", nb_ports);
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return 0;
> -     }
>  
>       /* Get the device id. */
>       port    = &ports[port_id];
> diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
> index c40f819..32d8f9a 100644
> --- a/app/test-pmd/config.c
> +++ b/app/test-pmd/config.c
> @@ -124,11 +124,15 @@ nic_stats_display(portid_t port_id)
>       struct rte_eth_stats stats;
>       struct rte_port *port = &ports[port_id];
>       uint8_t i;
> +     portid_t pid;
>  
>       static const char *nic_stats_border = "########################";
>  
> -     if (port_id >= nb_ports) {
> -             printf("Invalid port, range is [0, %d]\n", nb_ports - 1);
> +     if (port_id_is_invalid(port_id, ENABLED_WARN)) {
> +             printf("Valid port range is [0");
> +             FOREACH_PORT(pid, ports)
> +                     printf(", %d", pid);
> +             printf("]\n");
>               return;
>       }
>       rte_eth_stats_get(port_id, &stats);
> @@ -201,8 +205,13 @@ nic_stats_display(portid_t port_id)
>  void
>  nic_stats_clear(portid_t port_id)
>  {
> -     if (port_id >= nb_ports) {
> -             printf("Invalid port, range is [0, %d]\n", nb_ports - 1);
> +     portid_t pid;
> +
> +     if (port_id_is_invalid(port_id, ENABLED_WARN)) {
> +             printf("Valid port range is [0");
> +             FOREACH_PORT(pid, ports)
> +                     printf(", %d", pid);
> +             printf("]\n");
>               return;
>       }
>       rte_eth_stats_reset(port_id);
> @@ -249,11 +258,15 @@ nic_stats_mapping_display(portid_t port_id)
>  {
>       struct rte_port *port = &ports[port_id];
>       uint16_t i;
> +     portid_t pid;
>  
>       static const char *nic_stats_mapping_border = 
> "########################";
>  
> -     if (port_id >= nb_ports) {
> -             printf("Invalid port, range is [0, %d]\n", nb_ports - 1);
> +     if (port_id_is_invalid(port_id, ENABLED_WARN)) {
> +             printf("Valid port range is [0");
> +             FOREACH_PORT(pid, ports)
> +                     printf(", %d", pid);
> +             printf("]\n");
>               return;
>       }
>  
> @@ -302,9 +315,13 @@ port_infos_display(portid_t port_id)
>       int vlan_offload;
>       struct rte_mempool * mp;
>       static const char *info_border = "*********************";
> +     portid_t pid;
>  
> -     if (port_id >= nb_ports) {
> -             printf("Invalid port, range is [0, %d]\n", nb_ports - 1);
> +     if (port_id_is_invalid(port_id, ENABLED_WARN)) {
> +             printf("Valid port range is [0");
> +             FOREACH_PORT(pid, ports)
> +                     printf(", %d", pid);
> +             printf("]\n");
>               return;
>       }
>       port = &ports[port_id];
> @@ -362,11 +379,14 @@ port_infos_display(portid_t port_id)
>  }
>  
>  int
> -port_id_is_invalid(portid_t port_id)
> +port_id_is_invalid(portid_t port_id, enum print_warning warning)
>  {
> -     if (port_id < nb_ports)
> +     if (ports[port_id].enabled)

Here maybe care about overflow,  it could be passed a value of
RTE_PORT_ALL, which is 255.

Thanks,
Michael
>               return 0;
> -     printf("Invalid port %d (must be < nb_ports=%d)\n", port_id, nb_ports);
> +
> +     if (warning == ENABLED_WARN)
> +             printf("Invalid port %d\n", port_id);
> +
>       return 1;
>  }
>  
> @@ -425,7 +445,7 @@ port_reg_bit_display(portid_t port_id, uint32_t reg_off, 
> uint8_t bit_x)
>       uint32_t reg_v;
>  
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (port_reg_off_is_invalid(port_id, reg_off))
>               return;
> @@ -444,7 +464,7 @@ port_reg_bit_field_display(portid_t port_id, uint32_t 
> reg_off,
>       uint8_t  l_bit;
>       uint8_t  h_bit;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (port_reg_off_is_invalid(port_id, reg_off))
>               return;
> @@ -471,7 +491,7 @@ port_reg_display(portid_t port_id, uint32_t reg_off)
>  {
>       uint32_t reg_v;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (port_reg_off_is_invalid(port_id, reg_off))
>               return;
> @@ -485,7 +505,7 @@ port_reg_bit_set(portid_t port_id, uint32_t reg_off, 
> uint8_t bit_pos,
>  {
>       uint32_t reg_v;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (port_reg_off_is_invalid(port_id, reg_off))
>               return;
> @@ -513,7 +533,7 @@ port_reg_bit_field_set(portid_t port_id, uint32_t reg_off,
>       uint8_t  l_bit;
>       uint8_t  h_bit;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (port_reg_off_is_invalid(port_id, reg_off))
>               return;
> @@ -547,7 +567,7 @@ port_reg_bit_field_set(portid_t port_id, uint32_t reg_off,
>  void
>  port_reg_set(portid_t port_id, uint32_t reg_off, uint32_t reg_v)
>  {
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (port_reg_off_is_invalid(port_id, reg_off))
>               return;
> @@ -560,7 +580,7 @@ port_mtu_set(portid_t port_id, uint16_t mtu)
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       diag = rte_eth_dev_set_mtu(port_id, mtu);
>       if (diag == 0)
> @@ -723,7 +743,7 @@ rx_ring_desc_display(portid_t port_id, queueid_t rxq_id, 
> uint16_t rxd_id)
>  {
>       const struct rte_memzone *rx_mz;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (rx_queue_id_is_invalid(rxq_id))
>               return;
> @@ -740,7 +760,7 @@ tx_ring_desc_display(portid_t port_id, queueid_t txq_id, 
> uint16_t txd_id)
>  {
>       const struct rte_memzone *tx_mz;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (tx_queue_id_is_invalid(txq_id))
>               return;
> @@ -796,7 +816,7 @@ port_rss_reta_info(portid_t port_id,
>       uint16_t i, idx, shift;
>       int ret;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       ret = rte_eth_dev_rss_reta_query(port_id, reta_conf, nb_entries);
> @@ -828,7 +848,7 @@ port_rss_hash_conf_show(portid_t port_id, int 
> show_rss_key)
>       uint8_t i;
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       /* Get RSS hash key if asked to display it */
>       rss_conf.rss_key = (show_rss_key) ? rss_key : NULL;
> @@ -1406,12 +1426,8 @@ set_fwd_ports_list(unsigned int *portlist, unsigned 
> int nb_pt)
>   again:
>       for (i = 0; i < nb_pt; i++) {
>               port_id = (portid_t) portlist[i];
> -             if (port_id >= nb_ports) {
> -                     printf("Invalid port id %u >= %u\n",
> -                            (unsigned int) port_id,
> -                            (unsigned int) nb_ports);
> +             if (port_id_is_invalid(port_id, ENABLED_WARN))
>                       return;
> -             }
>               if (record_now)
>                       fwd_ports_ids[i] = port_id;
>       }
> @@ -1569,7 +1585,7 @@ vlan_extend_set(portid_t port_id, int on)
>       int diag;
>       int vlan_offload;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       vlan_offload = rte_eth_dev_get_vlan_offload(port_id);
> @@ -1591,7 +1607,7 @@ rx_vlan_strip_set(portid_t port_id, int on)
>       int diag;
>       int vlan_offload;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       vlan_offload = rte_eth_dev_get_vlan_offload(port_id);
> @@ -1612,7 +1628,7 @@ rx_vlan_strip_set_on_queue(portid_t port_id, uint16_t 
> queue_id, int on)
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_set_vlan_strip_on_queue(port_id, queue_id, on);
> @@ -1627,7 +1643,7 @@ rx_vlan_filter_set(portid_t port_id, int on)
>       int diag;
>       int vlan_offload;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       vlan_offload = rte_eth_dev_get_vlan_offload(port_id);
> @@ -1648,7 +1664,7 @@ rx_vft_set(portid_t port_id, uint16_t vlan_id, int on)
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (vlan_id_is_invalid(vlan_id))
>               return;
> @@ -1665,7 +1681,7 @@ rx_vlan_all_filter_set(portid_t port_id, int on)
>  {
>       uint16_t vlan_id;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       for (vlan_id = 0; vlan_id < 4096; vlan_id++)
>               rx_vft_set(port_id, vlan_id, on);
> @@ -1675,7 +1691,7 @@ void
>  vlan_tpid_set(portid_t port_id, uint16_t tp_id)
>  {
>       int diag;
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_set_vlan_ether_type(port_id, tp_id);
> @@ -1690,7 +1706,7 @@ vlan_tpid_set(portid_t port_id, uint16_t tp_id)
>  void
>  tx_vlan_set(portid_t port_id, uint16_t vlan_id)
>  {
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (vlan_id_is_invalid(vlan_id))
>               return;
> @@ -1701,7 +1717,7 @@ tx_vlan_set(portid_t port_id, uint16_t vlan_id)
>  void
>  tx_vlan_reset(portid_t port_id)
>  {
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       ports[port_id].tx_ol_flags &= ~TESTPMD_TX_OFFLOAD_INSERT_VLAN;
>  }
> @@ -1709,7 +1725,7 @@ tx_vlan_reset(portid_t port_id)
>  void
>  tx_vlan_pvid_set(portid_t port_id, uint16_t vlan_id, int on)
>  {
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       rte_eth_dev_set_vlan_pvid(port_id, vlan_id, on);
> @@ -1721,7 +1737,7 @@ set_qmap(portid_t port_id, uint8_t is_rx, uint16_t 
> queue_id, uint8_t map_value)
>       uint16_t i;
>       uint8_t existing_mapping_found = 0;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       if (is_rx ? (rx_queue_id_is_invalid(queue_id)) : 
> (tx_queue_id_is_invalid(queue_id)))
> @@ -1773,7 +1789,7 @@ fdir_add_signature_filter(portid_t port_id, uint8_t 
> queue_id,
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_fdir_add_signature_filter(port_id, fdir_filter,
> @@ -1791,7 +1807,7 @@ fdir_update_signature_filter(portid_t port_id, uint8_t 
> queue_id,
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_fdir_update_signature_filter(port_id, fdir_filter,
> @@ -1809,7 +1825,7 @@ fdir_remove_signature_filter(portid_t port_id,
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_fdir_remove_signature_filter(port_id, fdir_filter);
> @@ -1881,7 +1897,7 @@ fdir_get_infos(portid_t port_id)
>  
>       static const char *fdir_stats_border = "########################";
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       ret = rte_eth_dev_filter_supported(port_id, RTE_ETH_FILTER_FDIR);
>       if (ret < 0) {
> @@ -1955,7 +1971,7 @@ fdir_add_perfect_filter(portid_t port_id, uint16_t 
> soft_id, uint8_t queue_id,
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_fdir_add_perfect_filter(port_id, fdir_filter,
> @@ -1973,7 +1989,7 @@ fdir_update_perfect_filter(portid_t port_id, uint16_t 
> soft_id, uint8_t queue_id,
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_fdir_update_perfect_filter(port_id, fdir_filter,
> @@ -1991,7 +2007,7 @@ fdir_remove_perfect_filter(portid_t port_id, uint16_t 
> soft_id,
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_fdir_remove_perfect_filter(port_id, fdir_filter,
> @@ -2008,7 +2024,7 @@ fdir_set_masks(portid_t port_id, struct rte_fdir_masks 
> *fdir_masks)
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>  
>       diag = rte_eth_dev_fdir_set_masks(port_id, fdir_masks);
> @@ -2085,7 +2101,7 @@ set_vf_traffic(portid_t port_id, uint8_t is_rx, 
> uint16_t vf, uint8_t on)
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (is_rx)
>               diag = rte_eth_dev_set_vf_rx(port_id,vf,on);
> @@ -2107,7 +2123,7 @@ set_vf_rx_vlan(portid_t port_id, uint16_t vlan_id, 
> uint64_t vf_mask, uint8_t on)
>  {
>       int diag;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return;
>       if (vlan_id_is_invalid(vlan_id))
>               return;
> @@ -2124,7 +2140,7 @@ set_queue_rate_limit(portid_t port_id, uint16_t 
> queue_idx, uint16_t rate)
>       int diag;
>       struct rte_eth_link link;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return 1;
>       rte_eth_link_get_nowait(port_id, &link);
>       if (rate > link.link_speed) {
> @@ -2149,7 +2165,7 @@ set_vf_rate_limit(portid_t port_id, uint16_t vf, 
> uint16_t rate, uint64_t q_msk)
>       if (q_msk == 0)
>               return 0;
>  
> -     if (port_id_is_invalid(port_id))
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
>               return 1;
>       rte_eth_link_get_nowait(port_id, &link);
>       if (rate > link.link_speed) {
> diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
> index adf3203..6f2af18 100644
> --- a/app/test-pmd/parameters.c
> +++ b/app/test-pmd/parameters.c
> @@ -376,6 +376,7 @@ parse_portnuma_config(const char *q_arg)
>       };
>       unsigned long int_fld[_NUM_FLD];
>       char *str_fld[_NUM_FLD];
> +     portid_t pid;
>  
>       /* reset from value set at definition */
>       while ((p = strchr(p0,'(')) != NULL) {
> @@ -397,8 +398,11 @@ parse_portnuma_config(const char *q_arg)
>                               return -1;
>               }
>               port_id = (uint8_t)int_fld[FLD_PORT];
> -             if (port_id >= nb_ports) {
> -                     printf("Invalid port, range is [0, %d]\n", nb_ports - 
> 1);
> +             if (port_id_is_invalid(port_id, ENABLED_WARN)) {
> +                     printf("Valid port range is [0");
> +                     FOREACH_PORT(pid, ports)
> +                             printf(", %d", pid);
> +                     printf("]\n");
>                       return -1;
>               }
>               socket_id = (uint8_t)int_fld[FLD_SOCKET];
> @@ -429,6 +433,7 @@ parse_ringnuma_config(const char *q_arg)
>       };
>       unsigned long int_fld[_NUM_FLD];
>       char *str_fld[_NUM_FLD];
> +     portid_t pid;
>       #define RX_RING_ONLY 0x1
>       #define TX_RING_ONLY 0x2
>       #define RXTX_RING    0x3
> @@ -453,8 +458,11 @@ parse_ringnuma_config(const char *q_arg)
>                               return -1;
>               }
>               port_id = (uint8_t)int_fld[FLD_PORT];
> -             if (port_id >= nb_ports) {
> -                     printf("Invalid port, range is [0, %d]\n", nb_ports - 
> 1);
> +             if (port_id_is_invalid(port_id, ENABLED_WARN)) {
> +                     printf("Valid port range is [0");
> +                     FOREACH_PORT(pid, ports)
> +                             printf(", %d", pid);
> +                     printf("]\n");
>                       return -1;
>               }
>               socket_id = (uint8_t)int_fld[FLD_SOCKET];
> @@ -626,12 +634,12 @@ launch_args_parse(int argc, char** argv)
>  #endif
>                       if (!strcmp(lgopts[opt_idx].name, "nb-ports")) {
>                               n = atoi(optarg);
> -                             if (n > 0 && n <= nb_ports)
> +                             if (n > 0 &&
> +                                 !port_id_is_invalid(n, DISABLED_WARN))
>                                       nb_fwd_ports = (uint8_t) n;
>                               else
>                                       rte_exit(EXIT_FAILURE,
> -                                              "nb-ports should be > 0 and <= 
> %d\n",
> -                                              nb_ports);
> +                                              "Invalid port %d\n", n);
>                       }
>                       if (!strcmp(lgopts[opt_idx].name, "nb-cores")) {
>                               n = atoi(optarg);
> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
> index 773b8af..c18c1a9 100644
> --- a/app/test-pmd/testpmd.c
> +++ b/app/test-pmd/testpmd.c
> @@ -71,6 +71,7 @@
>  #include <rte_pci.h>
>  #include <rte_ether.h>
>  #include <rte_ethdev.h>
> +#include <rte_dev.h>
>  #include <rte_string_fns.h>
>  #ifdef RTE_LIBRTE_PMD_XENVIRT
>  #include <rte_eth_xenvirt.h>
> @@ -315,7 +316,7 @@ uint16_t nb_rx_queue_stats_mappings = 0;
>  
>  /* Forward function declarations */
>  static void map_port_queue_stats_mapping_registers(uint8_t pi, struct 
> rte_port *port);
> -static void check_all_ports_link_status(uint8_t port_num, uint32_t 
> port_mask);
> +static void check_all_ports_link_status(uint32_t port_mask);
>  
>  /*
>   * Check if all the ports are started.
> @@ -324,6 +325,20 @@ static void check_all_ports_link_status(uint8_t 
> port_num, uint32_t port_mask);
>  static int all_ports_started(void);
>  
>  /*
> + * Find next enabled port
> + */
> +portid_t
> +find_next_port(portid_t p, struct rte_port *ports, int size)
> +{
> +     if (ports == NULL)
> +             rte_exit(-EINVAL, "failed to find a next port id\n");
> +
> +     while ((ports[p].enabled == 0) && (p < size))
> +             p++;
> +     return p;
> +}
> +
> +/*
>   * Setup default configuration.
>   */
>  static void
> @@ -552,7 +567,8 @@ init_config(void)
>                               + RTE_TEST_TX_DESC_MAX + MAX_PKT_BURST;
>  
>               if (!numa_support)
> -                     nb_mbuf_per_pool = (nb_mbuf_per_pool * nb_ports);
> +                     nb_mbuf_per_pool =
> +                             (nb_mbuf_per_pool * RTE_MAX_ETHPORTS);
>       }
>  
>       if (!numa_support) {
> @@ -565,14 +581,19 @@ init_config(void)
>  
>       /* Configuration of Ethernet ports. */
>       ports = rte_zmalloc("testpmd: ports",
> -                         sizeof(struct rte_port) * nb_ports,
> +                         sizeof(struct rte_port) * RTE_MAX_ETHPORTS,
>                           RTE_CACHE_LINE_SIZE);
>       if (ports == NULL) {
> -             rte_exit(EXIT_FAILURE, "rte_zmalloc(%d struct rte_port) "
> -                                                     "failed\n", nb_ports);
> +             rte_exit(EXIT_FAILURE,
> +                             "rte_zmalloc(%d struct rte_port) failed\n",
> +                             RTE_MAX_ETHPORTS);
>       }
>  
> -     for (pid = 0; pid < nb_ports; pid++) {
> +     /* enabled allocated ports */
> +     for (pid = 0; pid < nb_ports; pid++)
> +             ports[pid].enabled = 1;
> +
> +     FOREACH_PORT(pid, ports) {
>               port = &ports[pid];
>               rte_eth_dev_info_get(pid, &port->dev_info);
>  
> @@ -602,8 +623,7 @@ init_config(void)
>                       nb_mbuf_per_pool = nb_mbuf_per_pool/nb_ports;
>  
>               for (i = 0; i < MAX_SOCKET; i++) {
> -                     nb_mbuf = (nb_mbuf_per_pool *
> -                                             port_per_socket[i]);
> +                     nb_mbuf = (nb_mbuf_per_pool * RTE_MAX_ETHPORTS);
>                       if (nb_mbuf)
>                               mbuf_pool_create(mbuf_data_size,
>                                               nb_mbuf,i);
> @@ -635,14 +655,6 @@ reconfig(portid_t new_port_id, unsigned socket_id)
>       struct rte_port *port;
>  
>       /* Reconfiguration of Ethernet ports. */
> -     ports = rte_realloc(ports,
> -                         sizeof(struct rte_port) * nb_ports,
> -                         RTE_CACHE_LINE_SIZE);
> -     if (ports == NULL) {
> -             rte_exit(EXIT_FAILURE, "rte_realloc(%d struct rte_port) 
> failed\n",
> -                             nb_ports);
> -     }
> -
>       port = &ports[new_port_id];
>       rte_eth_dev_info_get(new_port_id, &port->dev_info);
>  
> @@ -663,7 +675,7 @@ init_fwd_streams(void)
>       streamid_t sm_id, nb_fwd_streams_new;
>  
>       /* set socket id according to numa or not */
> -     for (pid = 0; pid < nb_ports; pid++) {
> +     FOREACH_PORT(pid, ports) {
>               port = &ports[pid];
>               if (nb_rxq > port->dev_info.max_rx_queues) {
>                       printf("Fail: nb_rxq(%d) is greater than "
> @@ -1264,7 +1276,7 @@ all_ports_started(void)
>       portid_t pi;
>       struct rte_port *port;
>  
> -     for (pi = 0; pi < nb_ports; pi++) {
> +     FOREACH_PORT(pi, ports) {
>               port = &ports[pi];
>               /* Check if there is a port which is not started */
>               if (port->port_status != RTE_PORT_STARTED)
> @@ -1276,6 +1288,45 @@ all_ports_started(void)
>  }
>  
>  int
> +all_ports_stopped(void)
> +{
> +     portid_t pi;
> +     struct rte_port *port;
> +
> +     FOREACH_PORT(pi, ports) {
> +             port = &ports[pi];
> +             if (port->port_status != RTE_PORT_STOPPED)
> +                     return 0;
> +     }
> +
> +     return 1;
> +}
> +
> +int
> +port_is_started(portid_t port_id)
> +{
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
> +             return 0;
> +
> +     if (ports[port_id].port_status != RTE_PORT_STARTED)
> +             return 0;
> +
> +     return 1;
> +}
> +
> +static int
> +port_is_closed(portid_t port_id)
> +{
> +     if (port_id_is_invalid(port_id, ENABLED_WARN))
> +             return 0;
> +
> +     if (ports[port_id].port_status != RTE_PORT_CLOSED)
> +             return 0;
> +
> +     return 1;
> +}
> +
> +int
>  start_port(portid_t pid)
>  {
>       int diag, need_check_link_status = 0;
> @@ -1296,8 +1347,8 @@ start_port(portid_t pid)
>  
>       if(dcb_config)
>               dcb_test = 1;
> -     for (pi = 0; pi < nb_ports; pi++) {
> -             if (pid < nb_ports && pid != pi)
> +     FOREACH_PORT(pi, ports) {
> +             if (!port_id_is_invalid(pid, DISABLED_WARN) && pid != pi)
>                       continue;
>  
>               port = &ports[pi];
> @@ -1421,7 +1472,7 @@ start_port(portid_t pid)
>       }
>  
>       if (need_check_link_status && !no_link_check)
> -             check_all_ports_link_status(nb_ports, RTE_PORT_ALL);
> +             check_all_ports_link_status(RTE_PORT_ALL);
>       else
>               printf("Please stop the ports first\n");
>  
> @@ -1446,8 +1497,8 @@ stop_port(portid_t pid)
>       }
>       printf("Stopping ports...\n");
>  
> -     for (pi = 0; pi < nb_ports; pi++) {
> -             if (pid < nb_ports && pid != pi)
> +     FOREACH_PORT(pi, ports) {
> +             if (!port_id_is_invalid(pid, DISABLED_WARN) && pid != pi)
>                       continue;
>  
>               port = &ports[pi];
> @@ -1463,7 +1514,7 @@ stop_port(portid_t pid)
>               need_check_link_status = 1;
>       }
>       if (need_check_link_status && !no_link_check)
> -             check_all_ports_link_status(nb_ports, RTE_PORT_ALL);
> +             check_all_ports_link_status(RTE_PORT_ALL);
>  
>       printf("Done\n");
>  }
> @@ -1481,8 +1532,8 @@ close_port(portid_t pid)
>  
>       printf("Closing ports...\n");
>  
> -     for (pi = 0; pi < nb_ports; pi++) {
> -             if (pid < nb_ports && pid != pi)
> +     FOREACH_PORT(pi, ports) {
> +             if (!port_id_is_invalid(pid, DISABLED_WARN) && pid != pi)
>                       continue;
>  
>               port = &ports[pi];
> @@ -1502,31 +1553,83 @@ close_port(portid_t pid)
>       printf("Done\n");
>  }
>  
> -int
> -all_ports_stopped(void)
> +void
> +attach_port(char *identifier)
>  {
> -     portid_t pi;
> -     struct rte_port *port;
> +     portid_t i, j, pi = 0;
>  
> -     for (pi = 0; pi < nb_ports; pi++) {
> -             port = &ports[pi];
> -             if (port->port_status != RTE_PORT_STOPPED)
> -                     return 0;
> +     printf("Attaching a new port...\n");
> +
> +     if (identifier == NULL) {
> +             printf("Invalid parameters are speficied\n");
> +             return;
>       }
>  
> -     return 1;
> +     if (test_done == 0) {
> +             printf("Please stop forwarding first\n");
> +             return;
> +     }
> +
> +     if (rte_eal_dev_attach(identifier, &pi))
> +             return;
> +
> +     ports[pi].enabled = 1;
> +     reconfig(pi, rte_eth_dev_socket_id(pi));
> +     rte_eth_promiscuous_enable(pi);
> +
> +     nb_ports = rte_eth_dev_count();
> +
> +     /* set_default_fwd_ports_config(); */
> +     bzero(fwd_ports_ids, sizeof(fwd_ports_ids));
> +     i = 0;
> +     FOREACH_PORT(j, ports) {
> +             fwd_ports_ids[i] = j;
> +             i++;
> +     }
> +     nb_cfg_ports = nb_ports;
> +     nb_fwd_ports++;
> +
> +     ports[pi].port_status = RTE_PORT_STOPPED;
> +
> +     printf("Port %d is attached. Now total ports is %d\n", pi, nb_ports);
> +     printf("Done\n");
>  }
>  
> -int
> -port_is_started(portid_t port_id)
> +void
> +detach_port(uint8_t port_id)
>  {
> -     if (port_id_is_invalid(port_id))
> -             return -1;
> +     portid_t i, pi = 0;
> +     char name[RTE_ETH_NAME_MAX_LEN];
>  
> -     if (ports[port_id].port_status != RTE_PORT_STARTED)
> -             return 0;
> +     printf("Detaching a port...\n");
>  
> -     return 1;
> +     if (!port_is_closed(port_id)) {
> +             printf("Please close port first\n");
> +             return;
> +     }
> +
> +     rte_eth_promiscuous_disable(port_id);
> +
> +     if (rte_eal_dev_detach(port_id, name))
> +             return;
> +
> +     ports[port_id].enabled = 0;
> +     nb_ports = rte_eth_dev_count();
> +
> +     /* set_default_fwd_ports_config(); */
> +     bzero(fwd_ports_ids, sizeof(fwd_ports_ids));
> +     i = 0;
> +     FOREACH_PORT(pi, ports) {
> +             fwd_ports_ids[i] = pi;
> +             i++;
> +     }
> +     nb_cfg_ports = nb_ports;
> +     nb_fwd_ports--;
> +
> +     printf("Port '%s' is detached. Now total ports is %d\n",
> +                     name, nb_ports);
> +     printf("Done\n");
> +     return;
>  }
>  
>  void
> @@ -1534,7 +1637,7 @@ pmd_test_exit(void)
>  {
>       portid_t pt_id;
>  
> -     for (pt_id = 0; pt_id < nb_ports; pt_id++) {
> +     FOREACH_PORT(pt_id, ports) {
>               printf("Stopping port %d...", pt_id);
>               fflush(stdout);
>               rte_eth_dev_close(pt_id);
> @@ -1553,7 +1656,7 @@ struct pmd_test_command {
>  
>  /* Check the link status of all ports in up to 9s, and print them finally */
>  static void
> -check_all_ports_link_status(uint8_t port_num, uint32_t port_mask)
> +check_all_ports_link_status(uint32_t port_mask)
>  {
>  #define CHECK_INTERVAL 100 /* 100ms */
>  #define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
> @@ -1564,7 +1667,7 @@ check_all_ports_link_status(uint8_t port_num, uint32_t 
> port_mask)
>       fflush(stdout);
>       for (count = 0; count <= MAX_CHECK_TIME; count++) {
>               all_ports_up = 1;
> -             for (portid = 0; portid < port_num; portid++) {
> +             FOREACH_PORT(portid, ports) {
>                       if ((port_mask & (1 << portid)) == 0)
>                               continue;
>                       memset(&link, 0, sizeof(link));
> @@ -1688,7 +1791,7 @@ init_port_config(void)
>       portid_t pid;
>       struct rte_port *port;
>  
> -     for (pid = 0; pid < nb_ports; pid++) {
> +     FOREACH_PORT(pid, ports) {
>               port = &ports[pid];
>               port->dev_conf.rxmode = rx_mode;
>               port->dev_conf.fdir_conf = fdir_conf;
> @@ -1877,7 +1980,7 @@ main(int argc, char** argv)
>  
>       nb_ports = (portid_t) rte_eth_dev_count();
>       if (nb_ports == 0)
> -             rte_exit(EXIT_FAILURE, "No probed ethernet device\n");
> +             RTE_LOG(WARNING, EAL, "No probed ethernet devices\n");
>  
>       set_def_fwd_config();
>       if (nb_lcores == 0)
> @@ -1899,7 +2002,7 @@ main(int argc, char** argv)
>               rte_exit(EXIT_FAILURE, "Start ports failed\n");
>  
>       /* set all ports to promiscuous mode by default */
> -     for (port_id = 0; port_id < nb_ports; port_id++)
> +     FOREACH_PORT(port_id, ports)
>               rte_eth_promiscuous_enable(port_id);
>  
>  #ifdef RTE_LIBRTE_CMDLINE
> diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
> index 8f5e6c7..109c670 100644
> --- a/app/test-pmd/testpmd.h
> +++ b/app/test-pmd/testpmd.h
> @@ -134,6 +134,7 @@ struct fwd_stream {
>   * The data structure associated with each port.
>   */
>  struct rte_port {
> +     uint8_t                 enabled;    /**< Port enabled or not */
>       struct rte_eth_dev_info dev_info;   /**< PCI info + driver name */
>       struct rte_eth_conf     dev_conf;   /**< Port configuration. */
>       struct ether_addr       eth_addr;   /**< Port ethernet address */
> @@ -159,6 +160,14 @@ struct rte_port {
>       struct rte_eth_txconf   tx_conf;    /**< tx configuration */
>  };
>  
> +extern portid_t __rte_unused
> +find_next_port(portid_t p, struct rte_port *ports, int size);
> +
> +#define FOREACH_PORT(p, ports) \
> +     for (p = find_next_port(0, ports, RTE_MAX_ETHPORTS); \
> +         p < RTE_MAX_ETHPORTS; \
> +         p = find_next_port(p + 1, ports, RTE_MAX_ETHPORTS))
> +
>  /**
>   * The data structure associated with each forwarding logical core.
>   * The logical cores are internally numbered by a core index from 0 to
> @@ -515,6 +524,8 @@ int init_port_dcb_config(portid_t pid,struct dcb_config 
> *dcb_conf);
>  int start_port(portid_t pid);
>  void stop_port(portid_t pid);
>  void close_port(portid_t pid);
> +void attach_port(char *identifier);
> +void detach_port(uint8_t port_id);
>  int all_ports_stopped(void);
>  int port_is_started(portid_t port_id);
>  void pmd_test_exit(void);
> @@ -558,10 +569,15 @@ void get_ethertype_filter(uint8_t port_id, uint16_t 
> index);
>  void get_2tuple_filter(uint8_t port_id, uint16_t index);
>  void get_5tuple_filter(uint8_t port_id, uint16_t index);
>  void get_flex_filter(uint8_t port_id, uint16_t index);
> -int port_id_is_invalid(portid_t port_id);
>  int rx_queue_id_is_invalid(queueid_t rxq_id);
>  int tx_queue_id_is_invalid(queueid_t txq_id);
>  
> +enum print_warning {
> +     ENABLED_WARN = 0,
> +     DISABLED_WARN
> +};
> +int port_id_is_invalid(portid_t port_id, enum print_warning warning);
> +
>  /*
>   * Work-around of a compilation error with ICC on invocations of the
>   * rte_be_to_cpu_16() function.
> diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst 
> b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> index 218835a..1cacbcf 100644
> --- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> +++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> @@ -808,6 +808,63 @@ The following sections show functions for configuring 
> ports.
>  
>      Port configuration changes only become active when forwarding is 
> started/restarted.
>  
> +port attach
> +~~~~~~~~~~~
> +
> +Attach a port specified by pci address or virtual device args.
> +
> +To attach a new pci device, the device should be recognized by kernel first.
> +Then it should be moved under DPDK management.
> +Finally the port can be attached to testpmd.
> +On the other hand, to attach a port created by virtual device, above steps 
> are not needed.
> +
> +port attach (identifier)
> +
> +For example, to attach a port that pci address is 0000:02:00.0.
> +
> +.. code-block:: console
> +
> +    testpmd> port attach 0000:02:00.0
> +    Attaching a new port...
> +    ... snip ...
> +    Port 0 is attached. Now total ports is 1
> +    Done
> +
> +For example, to attach a port created by pcap PMD.
> +
> +.. code-block:: console
> +
> +    testpmd> port attach eth_pcap0,iface=eth0
> +    Attaching a new port...
> +    ... snip ...
> +    Port 0 is attached. Now total ports is 1
> +    Done
> +
> +In this case, identifier is "eth_pcap0,iface=eth0".
> +This identifier format is the same as "--vdev" format of DPDK applications.
> +
> +port detach
> +~~~~~~~~~~~
> +
> +Detach a specific port.
> +
> +Before detaching a port, the port should be closed.
> +Also to remove a pci device completely from the system, first detach the 
> port from testpmd.
> +Then the device should be moved under kernel management.
> +Finally the device can be remove using kernel pci hotplug functionality.
> +On the other hand, to remove a port created by virtual device, above steps 
> are not needed.
> +
> +port detach (port_id)
> +
> +For example, to detach a port 0.
> +
> +.. code-block:: console
> +
> +    testpmd> port detach 0
> +    Detaching a port...
> +    ... snip ...
> +    Done
> +
>  port start
>  ~~~~~~~~~~
>  

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