Even though we have the code and have CONFIG_CHELSIO_T4 enabled in our config files, it depends depends on CHELSIO_T4_DEPENDS which we don't have enabled and is not mentioned in any of aour Kconfig files.
Solution: add the following lines to drivers/net/Kconfig:
depends on PCI && INET
and enable CONFIG_CHELSIO_T4_DEPENDS in config-generic.
MRG-1 on Red Hat Enterprise Linux 5 reached it's end of life on March 31, 2014. Because this issue is against the MRG-1 release, we are closing it WONTFIX. If you believe this is still an issue on our most recent MRG-2.5 3.10 kernel, please file a new issue for tracking.