net/mlx5: add getting IB ports number for multiport IB

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 these ports.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>

diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index befe0ec..d69f589 100644 (file)
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -422,6 +422,7 @@ void mlx5_nl_mac_addr_sync(struct rte_eth_dev *dev);
 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 4209801..fd9226b 100644 (file)
--- a/drivers/net/mlx5/mlx5_nl.c
+++ b/drivers/net/mlx5/mlx5_nl.c
@@ -825,6 +825,51 @@ error:
        return 0;
 }
 
+/**
+ * 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.
  *