[PATCH iproute2-next v1] rdma: Print net device name and index for RDMA device

[Leon Romanovsky]

From: Leon Romanovsky <leo...@mellanox.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 <leo...@mellanox.com>
Reviewed-by: Steve Wise <sw...@opengridcomputing.com>
---
 Changes v0->v1:
  * Resend after commit 29122c1aae35 ("rdma: update rdma_netlink.h")
    which updated relevant netlink attributes.
  * Added Steve's ROB
---
 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);
+       }
+}
+
 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 a2e08e91..f38f0459 100644
--- a/rdma/utils.c
+++ b/rdma/utils.c
@@ -391,6 +391,8 @@ static const enum mnl_attr_data_type 
nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
        [RDMA_NLDEV_ATTR_RES_LKEY] = MNL_TYPE_U32,
        [RDMA_NLDEV_ATTR_RES_IOVA] = MNL_TYPE_U64,
        [RDMA_NLDEV_ATTR_RES_MRLEN] = MNL_TYPE_U64,
+       [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