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r317702: cxgbe(4): Support routines for Tx traffic scheduling. - Create a new file, t4_sched.c, and move all of the code related to traffic management from t4_main.c and t4_sge.c to this file. - Track both Channel Rate Limiter (ch_rl) and Class Rate Limiter (cl_rl) parameters in the PF driver. - Initialize all the cl_rl limiters with somewhat arbitrary default rates and provide routines to update them on the fly. - Provide routines to reserve and release traffic classes. r317847: cxgbe(4): The Tx scheduler initialization either works or doesn't. It doesn't need a refresh in either case. r318307: cxgbe(4): Avoid an out of bounds access when an attempt to unbind a tx queue from a traffic class fails. Sponsored by: Chelsio Communications