net/mlx5: fix RoCE LAG bond device probing

The RoCE LAG bond device requires neither E-Switch nor SR-IOV
configurations. It means the RoCE LAG bond device might be
presented as a single port Infiniband device.

The mlx5 PMD wrongly recognized standalone RoCE LAG bond device
as E-Switch configuration, this triggered the calls of E-Switch
ports related API and the latter failed (over the new OFED kernel
driver, starting since 5.4.1), causing the overall device probe
failure.

If there is a single port Infiniband bond device found the
E-Switch related flags must be cleared indicating standalone
configuration.

Also, it is not true anymore the bond device can exist
over E-Switch configurations only (as it was claimed for VF LAG
bond devices). The related checks are not relevant anymore
and removed.

Fixes: 790164ce1d2d ("net/mlx5: check kernel support for VF LAG bonding")
Cc: stable@dpdk.org
Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index 81fbed2..4712bd6 100644 (file)
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -2238,19 +2238,6 @@ mlx5_os_pci_probe_pf(struct rte_pci_device *pci_dev,
                        goto exit;
                }
        }
-#ifndef HAVE_MLX5DV_DR_DEVX_PORT
-       if (bd >= 0) {
-               /*
-                * This may happen if there is VF LAG kernel support and
-                * application is compiled with older rdma_core library.
-                */
-               DRV_LOG(ERR,
-                       "No kernel/verbs support for VF LAG bonding found.");
-               rte_errno = ENOTSUP;
-               ret = -rte_errno;
-               goto exit;
-       }
-#endif
        /*
         * Now we can determine the maximal
         * amount of devices to be spawned.
@@ -2314,10 +2301,18 @@ mlx5_os_pci_probe_pf(struct rte_pci_device *pci_dev,
                                                (list[ns].ifindex,
                                                 &list[ns].info);
                        }
-#ifdef HAVE_MLX5DV_DR_DEVX_PORT
                        if (!ret && bd >= 0) {
                                switch (list[ns].info.name_type) {
                                case MLX5_PHYS_PORT_NAME_TYPE_UPLINK:
+                                       if (np == 1) {
+                                               /*
+                                                * Force standalone bonding
+                                                * device for ROCE LAG
+                                                * confgiurations.
+                                                */
+                                               list[ns].info.master = 0;
+                                               list[ns].info.representor = 0;
+                                       }
                                        if (list[ns].info.port_name == bd)
                                                ns++;
                                        break;
@@ -2334,7 +2329,6 @@ mlx5_os_pci_probe_pf(struct rte_pci_device *pci_dev,
                                }
                                continue;
                        }
-#endif
                        if (!ret && (list[ns].info.representor ^
                                     list[ns].info.master))
                                ns++;