linux.git/drivers/infiniband/ulp/iser/iser_memory.c, branch v3.12

IB/iser: Introduce fast memory registration model (FRWR)

2013-08-10T00:18:10+00:00

Newer HCAs and Virtual functions may not support FMRs but rather a fast
registration model, which we call FRWR - "Fast Registration Work Requests".

This model was introduced in 00f7ec36c ("RDMA/core: Add memory management
extensions support") and works when the IB device supports the
IB_DEVICE_MEM_MGT_EXTENSIONS capability.

Upon creating the iser device iser will test whether the HCA supports
FMRs.  If no support for FMRs, check if IB_DEVICE_MEM_MGT_EXTENSIONS
is supported and assign function pointers that handle fast
registration and allocation of appropriate resources (fast_reg
descriptors).

Registration is done using posting IB_WR_FAST_REG_MR to the QP and
invalidations using posting IB_WR_LOCAL_INV.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier

IB/iser: Place the fmr pool into a union in iser's IB conn struct

2013-08-10T00:18:09+00:00

This is preparation step for other memory registration methods to be
added.  In addition, change reg/unreg routines signature to indicate
they use FMRs.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier

IB/iser: Handle unaligned SG in separate function

2013-08-10T00:18:09+00:00

This routine will be shared with other rdma management schemes.  The
bounce buffer solution for unaligned SG-lists and the sg_to_page_vec
routine are likely to be used for other registration schemes and not
just FMR.

Move them out of the FMR specific code, and call them from there.
Later they will be called also from other reg methods code.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier

IB/iser: Use proper debug level value for info prints

2013-08-10T00:18:08+00:00

Commit 4f363882612 ("IB/iser: Move informational messages from error
to info level") set info prints to be emitted at a lower debug level
than warning prints, which is a bit odd.  Fix that.

Also move the prints on unaligned SG from warning to debug level.

Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier

IB/iser: Add Mellanox copyright

2013-06-05T00:03:12+00:00

Add Mellanox copyright to the iser initiator source code which I maintain.

Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier

IB/iser: Return error to upper layers on EAGAIN registration failures

2013-05-02T00:34:13+00:00

Commit 819a087316a6 ("IB/iser: Avoid error prints on EAGAIN
registration failures") not only eliminated the error print on that
case, but rather also modified the code such that it doesn't return
any error to upper layers.  As a result a wrong mapping was used.  Fix
this to correctly return the error in that case.

Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier

IB/iser: Enable iser when FMRs are not supported

2013-02-22T08:22:30+00:00

Reuse the "SG unaligned for FMR" driver flow to make the initiator
functional when running over driver instance which doesn't support
FMRs, such as a mlx4 virtual function.

Signed-off-by: Or Gerlitz 
Signed-off-by: Alex Tabachnik 
Signed-off-by: Roland Dreier

IB/iser: Avoid error prints on EAGAIN registration failures

2013-02-22T08:22:29+00:00

Under IO/CPU stress its possible that the FMR pool might not have a
free FMR mapping element for iSER to use because of incomplete
background unmapping processing.  In that case we get -EAGAIN and the
IO is pushed back to the SCSI layer which soon retries it.  No need to
be so verbose about that.

Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier

infiniband: remove the second argument of k[un]map_atomic()

2012-03-20T13:48:18+00:00

Acked-by: Roland Dreier 
Signed-off-by: Cong Wang

IB/iser: Use atomic allocations

2010-02-24T17:41:12+00:00

Two minor flows in iSER's data path still use allocations; move them
to be atomic as a preperation step towards moving to use libiscsi
passthrough mode.

Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier