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 20:00:59 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Steve Wise <swise@...ngridcomputing.com>
Cc:     David Ahern <dsahern@...il.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 Mon, Mar 26, 2018 at 10:17:12AM -0500, Steve Wise wrote:
>
>
> 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'?

Because I think that it is useless for day-to-day usage of average
rdmatool user and mostly will be used as pipe to other scripts, if JSON
doesn't good fit for any reasons. So I decided do not clutter "general
output".

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

Thanks

>
> >  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
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

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