Re: [dpdk-dev] [PATCH V1 2/2] examples/ethtool: support the query of MTU

[David Marchand <david.marchand@redhat.com>]

On Thu, Apr 29, 2021 at 12:53 PM Min Hu (Connor) <humin29@huawei.com> wrote:
>
> From: Huisong Li <lihuisong@huawei.com>
>
> This patch supports the query of MTU.
>
> Signed-off-by: Huisong Li <lihuisong@huawei.com>
> ---
>  examples/ethtool/ethtool-app/ethapp.c | 48 +++++++++++++++++++++++++----------
>  examples/ethtool/lib/rte_ethtool.c    |  7 +++++
>  examples/ethtool/lib/rte_ethtool.h    | 14 ++++++++++
>  3 files changed, 56 insertions(+), 13 deletions(-)
>
> diff --git a/examples/ethtool/ethtool-app/ethapp.c b/examples/ethtool/ethtool-app/ethapp.c
> index fc743ce..aed4bc5 100644
> --- a/examples/ethtool/ethtool-app/ethapp.c
> +++ b/examples/ethtool/ethtool-app/ethapp.c
> @@ -517,31 +517,41 @@ pcmd_macaddr_callback(void *ptr_params,
>  static void
>  pcmd_mtu_callback(void *ptr_params,
>         __rte_unused struct cmdline *ctx,
> -       __rte_unused void *ptr_data)
> +       void *ptr_data)
>  {
>         struct pcmd_intstr_params *params = ptr_params;
>         int stat;
>         uint16_t new_mtu;
>         char *ptr_parse_end;
>
> -       new_mtu = strtoul(params->opt, &ptr_parse_end, 10);
> -       if (*ptr_parse_end != '\0' ||
> -                       new_mtu < RTE_ETHER_MIN_MTU ||
> -                       new_mtu > RTE_ETHER_MAX_JUMBO_FRAME_LEN) {
> -               printf("Port %i: Invalid MTU value\n", params->port);
> +       if (ptr_data == NULL) {
> +               new_mtu = strtoul(params->opt, &ptr_parse_end, 10);
> +               if (*ptr_parse_end != '\0' ||
> +                               new_mtu < RTE_ETHER_MIN_MTU ||
> +                               new_mtu > RTE_ETHER_MAX_JUMBO_FRAME_LEN) {
> +                       printf("Port %i: Invalid MTU value\n", params->port);
> +                       return;
> +               }
> +               stat = rte_ethtool_net_change_mtu(params->port, new_mtu);
> +               if (stat == 0)
> +                       printf("Port %i: MTU set to %i\n", params->port,
> +                               new_mtu);
> +               else if (stat == -ENOTSUP)
> +                       printf("Port %i: Operation not supported\n",
> +                               params->port);
> +               else
> +                       printf("Port %i: Error setting MTU\n", params->port);
> +
>                 return;
>         }
> -       stat = rte_ethtool_net_change_mtu(params->port, new_mtu);
> -       if (stat == 0)
> -               printf("Port %i: MTU set to %i\n", params->port, new_mtu);
> -       else if (stat == -ENOTSUP)
> +
> +       stat = rte_ethtool_net_get_mtu(params->port, &new_mtu);
> +       if (stat)
>                 printf("Port %i: Operation not supported\n", params->port);
>         else
> -               printf("Port %i: Error setting MTU\n", params->port);
> +               printf("Port %i: Current MTU: %i\n", params->port, new_mtu);
>  }


Please separate as two helpers, there is no code shared between set
and get, afaics.


>
> -
> -
>  static void pcmd_portstats_callback(__rte_unused void *ptr_params,
>         __rte_unused struct cmdline *ctx,
>         __rte_unused void *ptr_data)
> @@ -799,6 +809,17 @@ cmdline_parse_inst_t pcmd_macaddr = {
>                 NULL
>         },
>  };
> +cmdline_parse_inst_t pcmd_mtu_get = {
> +       .f = pcmd_mtu_callback,
> +       .data = (void *)0x01,
> +       .help_str = "mtu <port_id>\n"
> +               "     Get MTU",
> +       .tokens = {
> +               (void *)&pcmd_mtu_token_cmd,
> +               (void *)&pcmd_intstr_token_port,
> +               NULL
> +       },
> +};
>  cmdline_parse_inst_t pcmd_mtu = {
>         .f = pcmd_mtu_callback,
>         .data = NULL,
> @@ -879,6 +900,7 @@ cmdline_parse_ctx_t list_prompt_commands[] = {
>         (cmdline_parse_inst_t *)&pcmd_link,
>         (cmdline_parse_inst_t *)&pcmd_macaddr_get,
>         (cmdline_parse_inst_t *)&pcmd_macaddr,
> +       (cmdline_parse_inst_t *)&pcmd_mtu_get,
>         (cmdline_parse_inst_t *)&pcmd_mtu,
>         (cmdline_parse_inst_t *)&pcmd_open,
>         (cmdline_parse_inst_t *)&pcmd_pause_noopt,
> diff --git a/examples/ethtool/lib/rte_ethtool.c b/examples/ethtool/lib/rte_ethtool.c
> index 73193ed..e69b2c1 100644
> --- a/examples/ethtool/lib/rte_ethtool.c
> +++ b/examples/ethtool/lib/rte_ethtool.c
> @@ -345,6 +345,13 @@ rte_ethtool_net_validate_addr(uint16_t port_id __rte_unused,
>         return rte_is_valid_assigned_ether_addr(addr);
>  }
>
> +int
> +rte_ethtool_net_get_mtu(uint16_t port_id, uint16_t *mtu)
> +{
> +       RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
> +
> +       return rte_eth_dev_get_mtu(port_id, mtu);
> +}
>
>  int
>  rte_ethtool_net_change_mtu(uint16_t port_id, uint16_t mtu)
> diff --git a/examples/ethtool/lib/rte_ethtool.h b/examples/ethtool/lib/rte_ethtool.h
> index fe3250e..434ad1d 100644
> --- a/examples/ethtool/lib/rte_ethtool.h
> +++ b/examples/ethtool/lib/rte_ethtool.h
> @@ -23,6 +23,7 @@
>   * rte_ethtool_net_stop:            net_device_ops::ndo_stop
>   * rte_ethtool_net_set_mac_addr:    net_device_ops::ndo_set_mac_address
>   * rte_ethtool_net_validate_addr:   net_device_ops::ndo_validate_addr
> + * rte_ethtool_net_get_mtu:         net_device_ops::ndo_get_mtu
>   * rte_ethtool_net_change_mtu:      net_device_ops::ndo_change_mtu
>   * rte_ethtool_net_get_stats64:     net_device_ops::ndo_get_stats64
>   * rte_ethtool_net_vlan_rx_add_vid  net_device_ops::ndo_vlan_rx_add_vid
> @@ -296,6 +297,19 @@ int rte_ethtool_net_validate_addr(uint16_t port_id,
>                                 struct rte_ether_addr *addr);
>
>  /**
> + * Retrieve the MTU of an Ethernet device.
> + *
> + * @param port_id
> + *   The port identifier of the Ethernet device.
> + * @param mtu
> + *   A pointer to a uint16_t where the retrieved MTU is to be stored.
> + * @return
> + *   - (0) if successful.
> + *   - (-ENODEV) if *port_id* invalid.
> + */
> +int rte_ethtool_net_get_mtu(uint16_t port_id, uint16_t *mtu);
> +
> +/**
>   * Setting the Ethernet device maximum Tx unit.
>   *
>   * @param port_id
> --
> 2.8.1
>


-- 
David Marchand