[dpdk-dev] [PATCH 04/14] net/mlx5: add getting IB ports number for multiport IB

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

There is the routine mlx5_nl_portnum() added to get
the number of ports of multiport Infiniband device.
It is assumed the Uplink/VF representors are attached
on this ports.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5.h    |  1 +
 drivers/net/mlx5/mlx5_nl.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index f5e29ca..528ae02 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -470,6 +470,7 @@ int mlx5_nl_mac_addr_remove(struct rte_eth_dev *dev, struct ether_addr *mac,
 void mlx5_nl_mac_addr_flush(struct rte_eth_dev *dev);
 int mlx5_nl_promisc(struct rte_eth_dev *dev, int enable);
 int mlx5_nl_allmulti(struct rte_eth_dev *dev, int enable);
+unsigned int mlx5_nl_portnum(int nl, const char *name);
 unsigned int mlx5_nl_ifindex(int nl, const char *name, uint32_t pindex);
 int mlx5_nl_switch_info(int nl, unsigned int ifindex,
 			struct mlx5_switch_info *info);
diff --git a/drivers/net/mlx5/mlx5_nl.c b/drivers/net/mlx5/mlx5_nl.c
index 6e9145a..81483b8 100644
--- a/drivers/net/mlx5/mlx5_nl.c
+++ b/drivers/net/mlx5/mlx5_nl.c
@@ -826,6 +826,51 @@ struct mlx5_nl_ifindex_data {
 }
 
 /**
+ * Get the number of physical ports of given IB device.
+ *
+ * @param nl
+ *   Netlink socket of the RDMA kind (NETLINK_RDMA).
+ * @param[in] name
+ *   IB device name.
+ *
+ * @return
+ *   A valid (nonzero) number of ports on success, 0 otherwise
+ *   and rte_errno is set.
+ */
+unsigned int
+mlx5_nl_portnum(int nl, const char *name)
+{
+	uint32_t seq = random();
+	struct mlx5_nl_ifindex_data data = {
+		.name = name,
+		.ibindex = 0,
+		.ifindex = 0,
+		.portnum = 0,
+	};
+	struct nlmsghdr req = {
+		.nlmsg_len = NLMSG_LENGTH(0),
+		.nlmsg_type = RDMA_NL_GET_TYPE(RDMA_NL_NLDEV,
+					       RDMA_NLDEV_CMD_GET),
+		.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP,
+	};
+	int ret;
+
+	ret = mlx5_nl_send(nl, &req, seq);
+	if (ret < 0)
+		return 0;
+	ret = mlx5_nl_recv(nl, seq, mlx5_nl_cmdget_cb, &data);
+	if (ret < 0)
+		return 0;
+	if (!data.ibindex) {
+		rte_errno = ENODEV;
+		return 0;
+	}
+	if (!data.portnum)
+		rte_errno = EINVAL;
+	return data.portnum;
+}
+
+/**
  * Process switch information from Netlink message.
  *
  * @param nh
-- 
1.8.3.1