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authorJack Morgenstein <jackm@mellanox.co.il>2006-03-04 00:54:13 -0500
committerRoland Dreier <rolandd@cisco.com>2006-03-20 13:08:23 -0500
commitf36e1793e25513380cae5958a9164d4cc4458ad0 (patch)
treeaa31d34ee07971645af6f21068709166420caee2 /fs/nfsctl.c
parent6ecb0c849625e830ab96495d473bb704812c30e1 (diff)
IB/umad: Add support for large RMPP transfers
Add support for sending and receiving large RMPP transfers. The old code supports transfers only as large as a single contiguous kernel memory allocation. This patch uses linked list of memory buffers when sending and receiving data to avoid needing contiguous pages for larger transfers. Receive side: copy the arriving MADs in chunks instead of coalescing to one large buffer in kernel space. Send side: split a multipacket MAD buffer to a list of segments, (multipacket_list) and send these using a gather list of size 2. Also, save pointer to last sent segment, and retrieve requested segments by walking list starting at last sent segment. Finally, save pointer to last-acked segment. When retrying, retrieve segments for resending relative to this pointer. When updating last ack, start at this pointer. Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il> Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'fs/nfsctl.c')
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