[PATCH v4] libibverbs: display gid type in ibv_devinfo

[Devesh Sharma <devesh.sharma@broadcom.com>]

It becomes difficult to make out from the output of ibv_devinfo
if a particular gid index is RoCE v2 or not.

Adding a string to the output of ibv_devinfo -v to display the
gid type at the end of gid.

The output would look something like below:
$ ibv_devinfo -v -d bnxt_re2
hca_id: bnxt_re2
 transport:             InfiniBand (0)
 fw_ver:                216.0.220.0
 node_guid:             b226:28ff:fed3:b0f0
 sys_image_guid:        b226:28ff:fed3:b0f0
  .
  .
  .
  .
       phys_state:      LINK_UP (5)
       GID[  0]:        fe80:0000:0000:0000:b226:28ff:fed3:b0f0, IB/RoCE v1
       GID[  1]:        fe80:0000:0000:0000:b226:28ff:fed3:b0f0, RoCE v2
       GID[  2]:        0000:0000:0000:0000:0000:ffff:c0aa:0165, IB/RoCE v1
       GID[  3]:        0000:0000:0000:0000:0000:ffff:c0aa:0165, RoCE v2
$
$

Reviewed-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Gal Pressman <galpress@amazon.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
---
 libibverbs/driver.h           |  1 +
 libibverbs/examples/devinfo.c | 22 ++++++++++++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/libibverbs/driver.h b/libibverbs/driver.h
index a0e6f89..fc0699d 100644
--- a/libibverbs/driver.h
+++ b/libibverbs/driver.h
@@ -84,6 +84,7 @@ enum verbs_qp_mask {
 enum ibv_gid_type {
 	IBV_GID_TYPE_IB_ROCE_V1,
 	IBV_GID_TYPE_ROCE_V2,
+	IBV_GID_TYPE_INVALID
 };
 
 enum ibv_mr_type {
diff --git a/libibverbs/examples/devinfo.c b/libibverbs/examples/devinfo.c
index bf53eac..5bf1a39 100644
--- a/libibverbs/examples/devinfo.c
+++ b/libibverbs/examples/devinfo.c
@@ -162,8 +162,18 @@ static const char *vl_str(uint8_t vl_num)
 	}
 }
 
+static const char *gid_type_str(enum ibv_gid_type type)
+{
+	switch (type) {
+	case IBV_GID_TYPE_IB_ROCE_V1: return "IB/RoCE v1";
+	case IBV_GID_TYPE_ROCE_V2: return "RoCE v2";
+	default: return "Invalid gid type";
+	}
+}
+
 static int print_all_port_gids(struct ibv_context *ctx, uint8_t port_num, int tbl_len)
 {
+	enum ibv_gid_type type;
 	union ibv_gid gid;
 	int rc = 0;
 	int i;
@@ -175,8 +185,15 @@ static int print_all_port_gids(struct ibv_context *ctx, uint8_t port_num, int tb
 			       port_num, i);
 			return rc;
 		}
+
+		rc = ibv_query_gid_type(ctx, port_num, i, &type);
+		if (rc) {
+			rc = 0;
+			type = IBV_GID_TYPE_INVALID;
+		}
+
 		if (!null_gid(&gid))
-			printf("\t\t\tGID[%3d]:\t\t%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
+			printf("\t\t\tGID[%3d]:\t\t%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x, %s\n",
 			       i,
 			       gid.raw[ 0], gid.raw[ 1],
 			       gid.raw[ 2], gid.raw[ 3],
@@ -185,7 +202,8 @@ static int print_all_port_gids(struct ibv_context *ctx, uint8_t port_num, int tb
 			       gid.raw[ 8], gid.raw[ 9],
 			       gid.raw[10], gid.raw[11],
 			       gid.raw[12], gid.raw[13],
-			       gid.raw[14], gid.raw[15]);
+			       gid.raw[14], gid.raw[15],
+			       gid_type_str(type));
 	}
 	return rc;
 }
-- 
1.8.3.1