IB/iser: New receive buffer posting logic

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Currently, the recv buffer posting logic is based on the transactional
nature of iSER which allows for posting a buffer before sending a PDU.
Change this to post only when the number of outstanding recv buffers
is below a water mark and in a batched manner, thus simplifying and
optimizing the data path.  Use a pre-allocated ring of recv buffers
instead of allocating from kmem cache.  A special treatment is given
to the login response buffer whose size must be 8K unlike the size of
buffers used for any other purpose which is 128 bytes.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

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Or Gerlitz 2010-02-08 13:17:42 +00:00 • committed by Roland Dreier

parent 1cef465985

commit bcc60c381d

4 changed files with 235 additions and 176 deletions

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2

drivers/infiniband/ulp/iser/iscsi_iser.c

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40

drivers/infiniband/ulp/iser/iscsi_iser.h

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235

drivers/infiniband/ulp/iser/iser_initiator.c

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134

drivers/infiniband/ulp/iser/iser_verbs.c

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