[openib-general] [PATCH v2 1/7] IB/core - Add DMA mapping functions to allow device drivers to interpose

[Roland Dreier]

 > This structure misses some functions which are members of  struct
 > dma_mapping_ops.

I don't think we have to wrap every possible function if no IB
consumer uses it.

 > The most notable miss to me is dma_alloc/free_coherent, please note
 > that an IB consumer can call dma_alloc_coherent and place the resulted
 > dma_addr_t within an SGE provided to ibv_post_send/recv, see the RDS
 > code doing the allocation at ib_cm.c :: rds_ib_setup_qp and the direct
 > usage of the dma_addr_t at ib_recv :: rds_ib_recv_init_ring under
 > under http://oss.oracle.com/projects/rds/src/trunk/linux/net/rds

Given that some use of the dma_alloc_coherent interface exists though,
I do think it makes sense to wrap it.  So Ralph can you please add
that to your resubmission too (in addition to fixing the sync_single
issue).

Any other issues Or?  (BTW thanks for helping review this and pointing
out some good issues)