android_kernel_xiaomi_sm8350/drivers/infiniband
David Dillow 8cba207732 IB/srp: Respect target credit limit
The current SRP initiator will send requests even if it has no credits
available.  The results of sending extra requests are vendor specific,
but on some devices, overrunning credits will cost 85% of peak
performance -- e.g. 100 MB/s vs 720 MB/s.  Other devices may just drop
the requests.

This patch will tell the SCSI midlayer to queue requests if there are
fewer than two credits remaining, and will not issue a task management
request if there are no credits remaining.  The mid-layer will retry
the queued command once an outstanding command completes.

The patch also removes the unlikely() in __srp_get_tx_iu(), as it is
not at all unlikely to hit this limit under heavy load.

Signed-off-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2008-01-25 14:15:37 -08:00
..
core IPoIB: improve IPv4/IPv6 to IB mcast mapping functions 2008-01-25 14:15:37 -08:00
hw IB/ipath: Changes for fields moving from devdata to portdata 2008-01-25 14:15:36 -08:00
ulp IB/srp: Respect target credit limit 2008-01-25 14:15:37 -08:00
Kconfig IB: Use menuconfig for InfiniBand menu 2007-07-09 20:12:26 -07:00
Makefile IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters 2007-05-08 18:00:38 -07:00