Chelsio cxgb4 NIC does not work in RHEL 7

Issue

• How do I enable this Chelsio 10GB NIC?
• The cxgb4 module (driver) fails to load:

$ dmesg | grep cxgb4
[    3.439954] cxgb4 000a:01:00.0: enabling device (0140 -> 0142)
[    3.449332] cxgb4 000a:01:00.1: enabling device (0140 -> 0142)
[    3.457429] cxgb4 000a:01:00.4: enabling device (0140 -> 0142)
[    3.457878] cxgb4 000a:01:00.4: ibm,query-pe-dma-windows(53000000) 10000 8000000 20000028 returned 0
[    3.478418] cxgb4 000a:01:00.4: mbox 4: 100002901bff004 1400100001000000 8088000400000000 0 0 0 0 0
[    3.598404] cxgb4 000a:01:00.4: Coming up as MASTER: Adapter already initialized
[    3.598420] cxgb4 000a:01:00.4: bad SGE FL page buffer sizes [0, 0]
[    3.618747] cxgb4: probe of 000a:01:00.4 failed with error -22