linux-toradex.git/drivers/infiniband/ulp/iser/iser_memory.c, branch v3.15

IB/iser: Update Mellanox copyright note

2014-04-01T18:09:46+00:00

Update Mellanox copyrights for 2014 on the iser initiator driver.

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

IB/iser: Remove struct iscsi_iser_conn

2014-04-01T18:09:46+00:00

The iscsi stack has existing mechanisms to link back and forth between
the iscsi connection and the iscsi transport (e.g iser/tcp) connection.

This is done through a dd_data pointer field in struct iscsi_conn
which can be set to point to the transport connection, etc.

The iscsi_iser_conn structure was used to get this linking done in
another way, which is uneeded and adds extra complication to the iser
code, so we just remove it.

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

IB/iser: Support T10-PI operations

2014-03-18T05:33:58+00:00

Add logic to initialize protection information entities.  Upon each
iSCSI task, we keep the scsi_cmnd in order to query the scsi
protection operations and reference to protection buffers.

Modify iser_fast_reg_mr to receive indication whether it is
registering the data or protection buffers.

In addition introduce iser_reg_sig_mr which performs fast registration
work-request for a signature enabled memory region
(IB_WR_REG_SIG_MR).  In this routine we set all the protection
relevants for the device to offload protection data-transfer and
verification.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Alex Tabachnik 
Signed-off-by: Roland Dreier

IB/iser: Generalize fall_to_bounce_buf routine

2014-03-18T05:33:57+00:00

Unaligned SG-lists may also happen for protection information.
Generalize bounce buffer routine to handle any iser_data_buf which may
be data and/or protection.

This patch does not change any functionality.

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

IB/iser: Generalize iser_unmap_task_data and finalize_rdma_unaligned_sg

2014-03-18T05:33:57+00:00

This routines operates on data buffers and may also work with
protection infomation buffers.  So we generalize them to handle an
iser_data_buf which can be the command data or command protection
information.

This patch does not change any functionality.

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

IB/iser: Replace fastreg descriptor valid bool with indicators container

2014-03-18T05:33:57+00:00

In T10-PI support we will have memory keys for protection buffers and
signature transactions.  We prefer to compact indicators rather than
keeping multiple bools.

This commit does not change any functionality.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Alex Tabachnik 
Signed-off-by: Roland Dreier

IB/iser: Push the decision what memory key to use into fast_reg_mr routine

2014-03-18T05:33:57+00:00

This is a preparation step for T10-PI offload support.  We prefer to
push the desicion of which mkey to use (global or fastreg) to
iser_fast_reg_mr.  We choose to do this since in T10-PI we may need to
register for protection buffers and in this case we wish to simplify
iser_fast_reg_mr instead of repeating the logic of which key to use.

This patch does not change any functionality.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Alex Tabachnik 
Signed-off-by: Roland Dreier

IB/iser: Avoid FRWR notation, use fastreg instead

2014-03-18T05:33:57+00:00

FRWR stands for "fast registration work request". We want to avoid
calling the fastreg pool with that name, instead we name it fastreg
which stands for "fast registration".

This pool will include more elements in the future, so it is a good
idea to generalize the name.

Signed-off-by: Sagi Grimberg 
Signed-off-by: Alex Tabachnik 
Signed-off-by: Roland Dreier

IB/iser: Suppress completions for fast registration work requests

2014-03-18T05:33:54+00:00

In case iSER uses fast registration method, it should not request for
successful completions on fast registration nor local invalidate
requests.  We color wr_id with ISER_FRWR_LI_WRID in order to correctly
consume error completions.

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

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