Patch to fix the issue with Mellanox ConnectX-6 on OpenBSD 6.8

mcx-connect6.diff

--- if_mcx.c	Thu Nov  5 09:48:26 2020
+++ /usr/src/sys/dev/pci/if_mcx.c	Thu Nov  5 09:39:32 2020
@@ -839,6 +839,7 @@
 #define MCX_CAP_DEVICE_PORT_MODULE_EVENT \
 					0x80
 #define MCX_CAP_DEVICE_PORT_TYPE	0x03
+#define MCX_CAP_DEVICE_PORT_TYPE_ETH	0x01
 	uint8_t			num_ports;
 
 	uint8_t			snapshot_log_max_msg;
@@ -2543,6 +2544,7 @@
 	{ PCI_VENDOR_MELLANOX,	PCI_PRODUCT_MELLANOX_MT28800 },
 	{ PCI_VENDOR_MELLANOX,	PCI_PRODUCT_MELLANOX_MT28800VF },
 	{ PCI_VENDOR_MELLANOX,	PCI_PRODUCT_MELLANOX_MT2892  },
+	{ PCI_VENDOR_MELLANOX,	PCI_PRODUCT_MELLANOX_MT28908 },
 };
 
 struct mcx_eth_proto_capability {
@@ -3768,6 +3770,12 @@
 	mb = mcx_cq_mbox(&mxm, 0);
 	hca = mcx_cq_mbox_data(mb);
 
+	if ((hca->port_type & MCX_CAP_DEVICE_PORT_TYPE)
+	    != MCX_CAP_DEVICE_PORT_TYPE_ETH) {
+		printf(", not in ethernet mode\n");
+		error = -1;
+		goto free;
+	}
 	if (hca->log_pg_sz > PAGE_SHIFT) {
 		printf(", minimum system page shift %u is too large\n",
 		    hca->log_pg_sz);