linux-toradex.git/drivers/infiniband/ulp/iser, branch v3.0.58

IB/iser: Post initial receive buffers before sending the final login request

2012-04-02T16:27:10+00:00

commit 89e984e2c2cd14f77ccb26c47726ac7f13b70ae8 upstream.

An iser target may send iscsi NO-OP PDUs as soon as it marks the iSER
iSCSI session as fully operative.  This means that there is window
where there are no posted receive buffers on the initiator side, so
it's possible for the iSER RC connection to break because of RNR NAK /
retry errors.  To fix this, rely on the flags bits in the login
request to have FFP (0x3) in the lower nibble as a marker for the
final login request, and post an initial chunk of receive buffers
before sending that login request instead of after getting the login
response.

Signed-off-by: Or Gerlitz 
Signed-off-by: Roland Dreier 
Signed-off-by: Greg Kroah-Hartman

RDMA/cma: Pass QP type into rdma_create_id()

2011-05-25T20:46:23+00:00

The RDMA CM currently infers the QP type from the port space selected
by the user.  In the future (eg with RDMA_PS_IB or XRC), there may not
be a 1-1 correspondence between port space and QP type.  For netlink
export of RDMA CM state, we want to export the QP type to userspace,
so it is cleaner to explicitly associate a QP type to an ID.

Modify rdma_create_id() to allow the user to specify the QP type, and
use it to make our selections of datagram versus connected mode.

Signed-off-by: Sean Hefty 
Signed-off-by: Roland Dreier

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi

[SCSI] iser: export addr and port

2011-02-24T17:41:23+00:00

This pactch has iser export the address and port
of the endpoint.

Signed-off-by: Mike Christie 
Signed-off-by: James Bottomley

Update broken web addresses in the kernel.

2010-10-18T09:03:14+00:00

The patch below updates broken web addresses in the kernel

Signed-off-by: Justin P. Mattock 
Cc: Maciej W. Rozycki 
Cc: Geert Uytterhoeven 
Cc: Finn Thain 
Cc: Randy Dunlap 
Cc: Matt Turner 
Cc: Dimitry Torokhov 
Cc: Mike Frysinger 
Acked-by: Ben Pfaff 
Acked-by: Hans J. Koch 
Reviewed-by: Finn Thain 
Signed-off-by: Jiri Kosina

IB/iser: Make needlessly global iser_alloc_rx_descriptors() static

2010-08-04T16:54:55+00:00

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

IB/iser: Fix error flow in iser_create_ib_conn_res()

2010-05-12T16:30:45+00:00

We shouldn't free things here because we free them later.
The call tree looks like this:
	iser_connect() ==> initiating the connection establishment
and later
	iser_cma_handler() => iser_route_handler() => iser_create_ib_conn_res()
if we fail here, eventually iser_conn_release() is called, resulting
in a double free.

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

IB/iser: Enhance disconnection logic for multi-pathing

2010-05-12T16:30:44+00:00

The iser connection teardown flow isn't over until the underlying
Connection Manager (e.g the IB CM) delivers a disconnected or timeout
event through the RDMA-CM.  When the remote (target) side isn't
reachable, e.g when some HW e.g port/hca/switch isn't functioning or
taken down administratively, the CM timeout flow is used and the event
may be generated only after relatively long time -- on the order of
tens of seconds.

The current iser code exposes this possibly long delay to higher
layers, specifically to the iscsid daemon and iscsi kernel stack. As a
result, the iscsi stack doesn't respond well: this low-level CM delay
is added to the fail-over time under HA schemes such as the one
provided by DM multipath through the multipathd(8) service.

This patch enhances the reference counting scheme on iser's IB
connections so that the disconnect flow initiated by iscsid from user
space (ep_disconnect) doesn't wait for the CM to deliver the
disconnect/timeout event.  (The connection teardown isn't done from
iser's view point until the event is delivered)

The iser ib (rdma) connection object is destroyed when its reference
count reaches zero.  When this happens on the RDMA-CM callback
context, extra care is taken so that the RDMA-CM does the actual
destroying of the associated ID, since doing it in the callback is
prohibited.

The reference count of iser ib connection normally reaches three,
where the  relations are

 1. conn 
 2. conn 
 3. cma id 

With this patch, multipath fail-over time is about 30 seconds, while
without this patch, multipath fail-over time is about 130 seconds.

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

IB/iser: Remove buggy back-pointer setting

2010-05-12T16:30:44+00:00

The iscsi connection object life cycle includes binding and unbinding
(conn_stop) to/from the iscsi transport connection object.  Since
iscsi connection objects are recycled, at the time the transport
connection (e.g iser's IB connection) is released, it is not valid to
touch the iscsi connection tied to the transport back-pointer since it
may already point to a different transport connection.

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

IB/iser: Add asynchronous event handler

2010-05-12T16:30:43+00:00

Add handler to handle events such as port up and down.  This is useful
when testing high-availability schemes such as multi-pathing.

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