netdev - Re: [PATCH iproute2-next 2/2] rdma: Print net device name and index for RDMA device

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Date:   Mon, 26 Mar 2018 10:17:12 -0500
From:   Steve Wise <swise@...ngridcomputing.com>
To:     Leon Romanovsky <leon@...nel.org>, David Ahern <dsahern@...il.com>
Cc:     Leon Romanovsky <leonro@...lanox.com>,
        netdev <netdev@...r.kernel.org>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH iproute2-next 2/2] rdma: Print net device name and index
 for RDMA device



On 3/26/2018 3:28 AM, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...lanox.com>
>
> The RDMA devices are operated in RoCE and iWARP modes have net device
> underneath. Present their names in regular output and their net index
> in detailed mode.
>
> [root@nps ~]# rdma link show mlx5_3/1
> 4/1: mlx5_3/1: state ACTIVE physical_state LINK_UP netdev ens7
> [root@nps ~]# rdma link show mlx5_3/1 -d
> 4/1: mlx5_3/1: state ACTIVE physical_state LINK_UP netdev ens7 netdev_index 7
>     caps: <CM, IP_BASED_GIDS>
>
> Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
> ---
>  rdma/include/uapi/rdma/rdma_netlink.h |  4 ++++
>  rdma/link.c                           | 21 +++++++++++++++++++++
>  rdma/utils.c                          |  2 ++
>  3 files changed, 27 insertions(+)
>
> diff --git a/rdma/include/uapi/rdma/rdma_netlink.h b/rdma/include/uapi/rdma/rdma_netlink.h
> index 9446a721..45474f13 100644
> --- a/rdma/include/uapi/rdma/rdma_netlink.h
> +++ b/rdma/include/uapi/rdma/rdma_netlink.h
> @@ -388,6 +388,10 @@ enum rdma_nldev_attr {
>  	RDMA_NLDEV_ATTR_RES_LOCAL_DMA_LKEY,	/* u32 */
>  	RDMA_NLDEV_ATTR_RES_UNSAFE_GLOBAL_RKEY,	/* u32 */
>
> +	/* Netdev information for relevant protocols, like RoCE and iWARP */
> +	RDMA_NLDEV_ATTR_NDEV_INDEX,		/* u32 */
> +	RDMA_NLDEV_ATTR_NDEV_NAME,		/* string */
> +
>  	RDMA_NLDEV_ATTR_MAX
>  };
>  #endif /* _RDMA_NETLINK_H */
> diff --git a/rdma/link.c b/rdma/link.c
> index 66bcd50e..7e914c87 100644
> --- a/rdma/link.c
> +++ b/rdma/link.c
> @@ -205,6 +205,26 @@ static void link_print_phys_state(struct rd *rd, struct nlattr **tb)
>  		pr_out("physical_state %s ", phys_state_to_str(phys_state));
>  }
>
> +static void link_print_netdev(struct rd *rd, struct nlattr **tb)
> +{
> +	const char *netdev_name;
> +	uint32_t idx;
> +
> +	if (!tb[RDMA_NLDEV_ATTR_NDEV_NAME] || !tb[RDMA_NLDEV_ATTR_NDEV_INDEX])
> +		return;
> +
> +	netdev_name = mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_NDEV_NAME]);
> +	idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_NDEV_INDEX]);
> +	if (rd->json_output) {
> +		jsonw_string_field(rd->jw, "netdev", netdev_name);
> +		jsonw_uint_field(rd->jw, "netdev_index", idx);
> +	} else {
> +		pr_out("netdev %s ", netdev_name);
> +		if (rd->show_details)
> +			pr_out("netdev_index %u ", idx);
> +	}
> +}
> +

Why is the netdev_index under 'show_details'?

Reviewed-by: Steve Wise <swise@...ngridcomputing.com>

>  static int link_parse_cb(const struct nlmsghdr *nlh, void *data)
>  {
>  	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
> @@ -241,6 +261,7 @@ static int link_parse_cb(const struct nlmsghdr *nlh, void *data)
>  	link_print_lmc(rd, tb);
>  	link_print_state(rd, tb);
>  	link_print_phys_state(rd, tb);
> +	link_print_netdev(rd, tb);
>  	if (rd->show_details)
>  		link_print_caps(rd, tb);
>
> diff --git a/rdma/utils.c b/rdma/utils.c
> index f9460162..4fed80ab 100644
> --- a/rdma/utils.c
> +++ b/rdma/utils.c
> @@ -375,6 +375,8 @@ static const enum mnl_attr_data_type nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
>  	[RDMA_NLDEV_ATTR_RES_STATE]		= MNL_TYPE_U8,
>  	[RDMA_NLDEV_ATTR_RES_PID]		= MNL_TYPE_U32,
>  	[RDMA_NLDEV_ATTR_RES_KERN_NAME]	= MNL_TYPE_NUL_STRING,
> +	[RDMA_NLDEV_ATTR_NDEV_INDEX]		= MNL_TYPE_U32,
> +	[RDMA_NLDEV_ATTR_NDEV_NAME]		= MNL_TYPE_NUL_STRING,
>  };
>
>  int rd_attr_cb(const struct nlattr *attr, void *data)
> --
> 2.14.3
>
> --
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