svcrdma: Change DMA mapping logic to avoid the page_address kernel API

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There was logic in the send path that assumed that a page containing data
to send to the client has a KVA. This is not always the case and can result
in data corruption when page_address returns zero and we end up DMA mapping
zero.

This patch changes the bus mapping logic to avoid page_address() where
necessary and converts all calls from ib_dma_map_single to ib_dma_map_page
in order to keep the map/unmap calls symmetric.

Signed-off-by: Tom Tucker <tom@ogc.us>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

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This commit is contained in:

Tom Tucker 2010-10-12 15:33:52 -05:00 • committed by J. Bruce Fields

parent ecec6e34e1

commit b432e6b3d9

3 changed files with 78 additions and 38 deletions

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18

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

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80

net/sunrpc/xprtrdma/svc_rdma_sendto.c

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18

net/sunrpc/xprtrdma/svc_rdma_transport.c

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