bnxt_en: add support for HWRM request slices
Slices are a mechanism for suballocating DMA mapped regions from the request buffer. Such regions can be used for indirect command data instead of creating new mappings with dma_alloc_coherent(). The advantage of using a slice is that the lifetime of the slice is bound to the request and will be automatically unmapped when the request is consumed. A single external region is also supported. This allows for regions that will not fit inside the spare request buffer space such that the same API can be used consistently even for larger mappings. Signed-off-by: Edwin Peer <edwin.peer@broadcom.com> Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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