[PATCH 04/13] common/mlx5: query parent device over Netlink

[Dariusz Sosnowski]

Extend mlx5_nl_netdev_info_get() to gather Linux netdev's
parent device and bus name. This will be used in follow up patches
to match probed additional rte_device related to
single mlx5 common device.

Signed-off-by: Dariusz Sosnowski <dsosnowski at nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
---
 drivers/common/mlx5/linux/meson.build |  4 ++++
 drivers/common/mlx5/linux/mlx5_nl.c   | 24 ++++++++++++++++++++++++
 drivers/common/mlx5/linux/mlx5_nl.h   | 10 ++++++++++
 3 files changed, 38 insertions(+)

diff --git a/drivers/common/mlx5/linux/meson.build b/drivers/common/mlx5/linux/meson.build
index 3767e7a69b..1b2104b48e 100644
--- a/drivers/common/mlx5/linux/meson.build
+++ b/drivers/common/mlx5/linux/meson.build
@@ -154,6 +154,10 @@ has_sym_args = [
             'IFLA_PHYS_SWITCH_ID' ],
         [ 'HAVE_IFLA_PHYS_PORT_NAME', 'linux/if_link.h',
             'IFLA_PHYS_PORT_NAME' ],
+        [ 'HAVE_IFLA_PARENT_DEV_NAME', 'linux/if_link.h',
+            'IFLA_PARENT_DEV_NAME' ],
+        [ 'HAVE_IFLA_PARENT_DEV_BUS_NAME', 'linux/if_link.h',
+            'IFLA_PARENT_DEV_BUS_NAME' ],
         [ 'HAVE_RDMA_NL_NLDEV', 'rdma/rdma_netlink.h',
             'RDMA_NL_NLDEV' ],
         [ 'HAVE_RDMA_NLDEV_CMD_GET', 'rdma/rdma_netlink.h',
diff --git a/drivers/common/mlx5/linux/mlx5_nl.c b/drivers/common/mlx5/linux/mlx5_nl.c
index eafae78883..4eebec5223 100644
--- a/drivers/common/mlx5/linux/mlx5_nl.c
+++ b/drivers/common/mlx5/linux/mlx5_nl.c
@@ -113,6 +113,12 @@
 #ifndef HAVE_IFLA_PHYS_PORT_NAME
 #define IFLA_PHYS_PORT_NAME 38
 #endif
+#ifndef HAVE_IFLA_PARENT_DEV_NAME
+#define IFLA_PARENT_DEV_NAME 56
+#endif
+#ifndef HAVE_IFLA_PARENT_DEV_BUS_NAME
+#define IFLA_PARENT_DEV_BUS_NAME 57
+#endif
 
 /*
  * Some Devlink defines may be missed in old kernel versions,
@@ -1427,6 +1433,24 @@ mlx5_nl_netdev_info_cb(struct nlmsghdr *nh, void *arg)
 			}
 			info.flags |= MLX5_NETDEV_INFO_FLAG_PHYS_SWITCH_ID;
 			break;
+		case IFLA_PARENT_DEV_NAME:
+			payload_len = RTA_PAYLOAD(ra);
+			/* Some kernels do not pad attributes with zero. */
+			if (payload_len > 0 && payload_len < MLX5_PARENT_DEV_NAME_MAX) {
+				memcpy(info.parent_dev_name, payload, payload_len);
+				info.parent_dev_name[payload_len] = '\0';
+				info.flags |= MLX5_NETDEV_INFO_FLAG_PARENT_DEV_NAME;
+			}
+			break;
+		case IFLA_PARENT_DEV_BUS_NAME:
+			payload_len = RTA_PAYLOAD(ra);
+			/* Some kernels do not pad attributes with zero. */
+			if (payload_len > 0 && payload_len < MLX5_PARENT_DEV_BUS_NAME_MAX) {
+				memcpy(info.parent_dev_bus_name, payload, payload_len);
+				info.parent_dev_bus_name[payload_len] = '\0';
+				info.flags |= MLX5_NETDEV_INFO_FLAG_PARENT_DEV_BUS_NAME;
+			}
+			break;
 		}
 	}
 	*out = info;
diff --git a/drivers/common/mlx5/linux/mlx5_nl.h b/drivers/common/mlx5/linux/mlx5_nl.h
index 6446df1812..39691569bc 100644
--- a/drivers/common/mlx5/linux/mlx5_nl.h
+++ b/drivers/common/mlx5/linux/mlx5_nl.h
@@ -56,9 +56,17 @@ struct mlx5_nl_port_info {
 /* Maximal physical port name length. */
 #define MLX5_PHYS_PORT_NAME_MAX 128
 
+/* Maximum length of parent device name. */
+#define MLX5_PARENT_DEV_NAME_MAX 128
+
+/* Maximum length of parent device bus name. */
+#define MLX5_PARENT_DEV_BUS_NAME_MAX 128
+
 #define MLX5_NETDEV_INFO_FLAG_NUM_VF RTE_BIT32(0)
 #define MLX5_NETDEV_INFO_FLAG_PHYS_PORT_NAME RTE_BIT32(1)
 #define MLX5_NETDEV_INFO_FLAG_PHYS_SWITCH_ID RTE_BIT32(2)
+#define MLX5_NETDEV_INFO_FLAG_PARENT_DEV_NAME RTE_BIT32(3)
+#define MLX5_NETDEV_INFO_FLAG_PARENT_DEV_BUS_NAME RTE_BIT32(4)
 
 struct mlx5_netdev_info {
 	unsigned int ifindex; /* [in] */
@@ -66,6 +74,8 @@ struct mlx5_netdev_info {
 	uint32_t num_vf; /* [out] */
 	char phys_port_name[MLX5_PHYS_PORT_NAME_MAX]; /* [out] */
 	uint64_t phys_switch_id; /* [out] */
+	char parent_dev_name[MLX5_PARENT_DEV_NAME_MAX]; /* [out] */
+	char parent_dev_bus_name[MLX5_PARENT_DEV_BUS_NAME_MAX]; /* [out] */
 };
 
 __rte_internal
-- 
2.43.0