More info:
~ # cat /var/log/vmkernel.log | grep -i mlx
2014-08-27T12:41:04.180Z cpu0:32768)VisorFSTar: 1960: net_mlx4.v00 for 0x5bd2b bytes
2014-08-27T12:41:04.180Z cpu0:32768)VisorFSTar: 1960: net_mlx4.v01 for 0x39770 bytes
2014-08-27T12:41:04.180Z cpu0:32768)VisorFSTar: 1960: net_mlx4.v02 for 0x35d20 bytes
2014-08-27T12:41:11.461Z cpu43:33591)Loading module mlx4_core ...
2014-08-27T12:41:11.465Z cpu43:33591)Elf: 1861: module mlx4_core has license Dual BSD/GPL
2014-08-27T12:41:11.468Z cpu43:33591)skb_mem_info mempool for module mlx4_core created - max size 23068672
2014-08-27T12:41:11.468Z cpu43:33591)module heap vmklnx_mlx4_core: creation succeeded. id = 0x410a94f16000
2014-08-27T12:41:11.468Z cpu43:33591)PCI: driver mlx4_core is looking for devices
<6>mlx4_core: Mellanox ConnectX core driver v1.9.10.0 (Feb-16-2014)
2014-08-27T12:41:11.468Z cpu43:33591)<6>mlx4_core: Initializing 0000:04:00.0
2014-08-27T12:41:14.769Z cpu43:33591)<3>mlx4_core 0000:04:00.0: Couldn't map kernel access region, aborting.
2014-08-27T12:41:16.278Z cpu43:33591)WARNING: vmklinux: pci_announce_device:1488: PCI: driver mlx4_core probe failed for device 0000:04:00.0
2014-08-27T12:41:16.279Z cpu43:33591)PCI: driver mlx4_core claimed 0 device
2014-08-27T12:41:16.279Z cpu43:33591)Mod: 4780: Initialization of mlx4_core succeeded with module ID 4124.
2014-08-27T12:41:16.279Z cpu43:33591)mlx4_core loaded successfully.
2014-08-27T12:41:18.819Z cpu26:33598)Loading module mlx4_en ...
2014-08-27T12:41:18.823Z cpu26:33598)Elf: 1861: module mlx4_en has license Dual BSD/GPL
2014-08-27T12:41:18.825Z cpu26:33598)skb_mem_info mempool for module mlx4_en created - max size 23068672
2014-08-27T12:41:18.825Z cpu26:33598)module heap vmklnx_mlx4_en: creation succeeded. id = 0x410a5adea000
2014-08-27T12:41:18.825Z cpu26:33598)Mod: 4780: Initialization of mlx4_en succeeded with module ID 4130.
2014-08-27T12:41:18.825Z cpu26:33598)mlx4_en loaded successfully.
2014-08-27T12:41:19.183Z cpu26:33607)Loading module mlx4_ib ...
2014-08-27T12:41:19.186Z cpu26:33607)Elf: 1861: module mlx4_ib has license Dual BSD/GPL
2014-08-27T12:41:19.188Z cpu26:33607)skb_mem_info mempool for module mlx4_ib created - max size 23068672
2014-08-27T12:41:19.188Z cpu26:33607)module heap vmklnx_mlx4_ib: creation succeeded. id = 0x410b41de5000
2014-08-27T12:41:19.188Z cpu26:33607)Mod: 4780: Initialization of mlx4_ib succeeded with module ID 4140.
2014-08-27T12:41:19.188Z cpu26:33607)mlx4_ib loaded successfully.