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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>
This commit is contained in:
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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@@ -283,7 +283,7 @@ iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
* due to issues with the login code re iser sematics
* this not set in iscsi_conn_setup - FIXME
*/
conn->max_recv_dlength = 128;
conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
iser_conn = conn->dd_data;
conn->dd_data = iser_conn;