Commit Graph

91 Commits

Author SHA1 Message Date
Hannes Reinecke 649eb86938 scsi: libfc: reset exchange manager during LOGO handling
FC-LS mandates that we should invalidate all sequences before sending a
LOGO. And we should set the event to RPORT_EV_STOP when a LOGO request
has been received to signal that all exchanges are terminated.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Chad Dupuis <chad.dupuis@qlogic.com>
Tested-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-08-18 22:34:40 -04:00
Hannes Reinecke d391966a03 scsi: libfc: send LOGO for PLOGI failure
When running in point-to-multipoint mode PLOGI is done after FLOGI
completed. So when the PLOGI fails we should be sending a LOGO to the
remote port.

[mkp: Applied by hand]

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Chad Dupuis <chad.dupuis@qlogic.com>
Tested-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-08-18 22:34:05 -04:00
Hannes Reinecke 166f310b62 scsi: libfc: Issue PRLI after a PRLO has been received
When receiving a PRLO it just means that the operating parameters have
changed, it does _not_ mean that the port doesn't want to communicate
with us.  So instead of implicitly logging out we should be issueing a
PRLI to figure out the new operating parameters.  We can always recover
once PRLI fails.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Chad Dupuis <chad.dupuis@qlogic.com>
Tested-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-08-18 22:27:26 -04:00
Hannes Reinecke baa6719f90 libfc: Update rport reference counting
Originally libfc would just be initializing the refcount to '1', and
using the disc_mutex to synchronize if and when the final put should be
happening.  This has a race condition as the mutex might be delayed,
causing other threads to access an invalid structure.  This patch
updates the rport reference counting to increase the reference every
time 'rport_lookup' is called, and decreases the reference
correspondingly.  This removes the need to hold 'disc_mutex' when
removing the structure, and avoids the above race condition.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Acked-by: Vasu Dev <vasu.dev@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-07-12 23:16:31 -04:00
Bart Van Assche c1d454246c libfc: Source code comment spelling fixes
Change 'initiaive' into 'initiative', 'remainig' into 'remaining'
and change 'exected' into 'expected'.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Robert Love <robert.w.love@intel.com>
2013-09-04 12:47:49 -07:00
Mark Rustad e0335f67a2 libfc: Reject PLOGI from nodes with incompatible role
Reject a PLOGI from a node with an incompatible role,
that is, initiator-to-initiator or target-to-target.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Reviewed-by: Yi Zou <yi.zou@intel.com>
Tested-by: Jack Morgan <jack.morgan@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
2013-07-09 09:29:14 -07:00
Mark Rustad 732bdb9d14 libfc: Correct check for initiator role
The service_params field is being checked against the symbol
FC_RPORT_ROLE_FCP_INITIATOR where it really should be checked
against FCP_SPPF_INIT_FCN.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Jack Morgan <jack.morgan@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
2013-05-10 10:19:22 -07:00
Krishna Mohan a586069b0f libfc: XenServer fails to mount root filesystem.
schedule_delayed_work() is using msec instead of jiffies. On PLOGI
reject from target, remote port retry is scheduled @ 20 sec instead
of 2sec(FC_DEF_E_D_TOV).
XenServer dom0 kernel is configured with CONFIG_HZ=100Hz

Signed-off-by: Krishna Mohan <krmohan@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
2013-02-15 09:33:27 -08:00
Bart Van Assche c6b21c93c1 [SCSI] libfc: Declare local functions static
Avoid that sparse complains about missing declarations for local
functions by declaring these static or by adding an #include directive.
Add the __percpu annotation where it is missing.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-01-16 12:45:48 +04:00
Paul Gortmaker 09703660ed scsi: Add export.h for EXPORT_SYMBOL/THIS_MODULE as required
For the basic SCSI infrastructure files that are exporting symbols
but not modules themselves, add in the basic export.h header file
to allow the exports.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:23 -04:00
Linus Torvalds d4e06701b8 Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (77 commits)
  [SCSI] fix crash in scsi_dispatch_cmd()
  [SCSI] sr: check_events() ignore GET_EVENT when TUR says otherwise
  [SCSI] bnx2i: Fixed kernel panic due to illegal usage of sc->request->cpu
  [SCSI] bfa: Update the driver version to 3.0.2.1
  [SCSI] bfa: Driver and BSG enhancements.
  [SCSI] bfa: Added support to query PHY.
  [SCSI] bfa: Added HBA diagnostics support.
  [SCSI] bfa: Added support for flash configuration
  [SCSI] bfa: Added support to obtain SFP info.
  [SCSI] bfa: Added support for CEE info and stats query.
  [SCSI] bfa: Extend BSG interface.
  [SCSI] bfa: FCS bug fixes.
  [SCSI] bfa: DMA memory allocation enhancement.
  [SCSI] bfa: Brocade-1860 Fabric Adapter vHBA support.
  [SCSI] bfa: Brocade-1860 Fabric Adapter PLL init fixes.
  [SCSI] bfa: Added Fabric Assigned Address(FAA) support
  [SCSI] bfa: IOC bug fixes.
  [SCSI] bfa: Enable ASIC block configuration and query.
  [SCSI] bnx2i: Updated copyright and bump version
  [SCSI] bnx2i: Modified to skip CNIC registration if iSCSI is not supported
  ...

Fix up some trivial conflicts in:
 - drivers/scsi/bnx2fc/{bnx2fc.h,bnx2fc_fcoe.c}:
	Crazy broadcom version number conflicts
 - drivers/target/tcm_fc/tfc_cmd.c
	Just trivial cleanups done on adjacent lines
2011-07-23 11:13:11 -07:00
Lai Jiangshan 8497a24a43 scsi,rcu: Convert call_rcu(fc_rport_free_rcu) to kfree_rcu()
The rcu callback fc_rport_free_rcu() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(fc_rport_free_rcu).

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Robert Love <robert.w.love@intel.com>
Cc: "James E.J. Bottomley" <James.Bottomley@suse.de>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-07-20 14:10:12 -07:00
Kiran Patil 480584818a [SCSI] libfc: Enhancement to RPORT state machine applicable only for VN2VN mode
Problem: Existing RPORT state machine continues witg FLOGI/PLOGI
process only after it receices beacon from other end. Once claiming
stage is over (either clain notify or clain repose), beacon is sent
and state machine enters into operational mode where it initiates the
rlogin process (FLOGI/PLOGI) to the peer but before this rlogin is
initiated, exitsing implementation checks if it received beacon from
other end, it beacon is not received yet, rlogin process is not
initiated. Other end initiates FLOGI but peer end keeps on rejecting
FLOGI, hence after 3 retries other end deletes associated rport, then
sends a beacon. Once the beacon is received, peer end now initiates
rlogin to the peer end but since associated rport is deleted FLOGI is
neither accepted nor the reject response send out because rport is
deleted. Hence unable to proceed withg FLOGI/PLOGI process and fails
to establish VN2VN connection.

Fix: VN2VN spec is not standard yet but based on exitsing collateral
on T11, it appears that, both end shall send beacon and enter into
'operational mode' without explictly waiting for beacon from other
end. Fix is to allow the RPORT login process as long as respective
RPORT is created (as part of claim notification / claim response) even
though state of RPORT is INIT. Means don't wait for beacon from peer
end, if peer end initiates FLOGI (means peer end exist and
responding).

Notes: This patch is preparing the FCoE stack for target wrt
offload. This is generic patch and harmless even if applied on storage
initiator because 'else if' condition of function 'fcoe_oem_found'
shall evaluate to TRUE only for targets.

Dependencies: None

Signed-off-by: Kiran Patil <kiran.patil@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2011-06-29 16:28:33 -05:00
Parikh, Neerav fe5e3f1aec [SCSI] libfc: Fixing a memory leak when destroying an interface
When an fcoe interface is being destroyed; in the process the
fcoe driver will try to release all the resources it had allocated
for that interface including rports. But, it seems that it does not
release the reference held for the name server rport in that process
resulting into a memory leak. This patch fixes that memory leak.

Signed-off-by: Neerav Parikh <neerav.parikh@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-28 18:28:45 -06:00
Bhanu Prakash Gollapudi 75a2792df2 [SCSI] libfc: introduce LLD event callback
This patch enables LLD to listen to rport events and perform LLD
specific operations based on the rport event. This patch also stores
sp_features and spp_type in rdata for further reference by LLD.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12 11:09:04 -06:00
Joe Eykholt 925cedae2b [SCSI] libfc: use PRLI hook to get parameters when sending outgoing PRLI
When sending an outgoing PRLI as an initiator, get the parameters
from registered providers so that they all get a chance to decide
on roles.

The passive provider is called last, and could override the
initiator role.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12 11:02:22 -06:00
Joe Eykholt 96ad846445 [SCSI] libfc: add hook for FC-4 provider registration
Allow FC-4 provider modules to hook into libfc, mostly for targets.
This should allow any FC-4 module to handle PRLI requests and maintain
process-association states.

Each provider registers its ops with libfc and then will be called for
any incoming PRLI for that FC-4 type on any instance.   The provider
can decide whether to handle that particular instance using any method
it likes, such as ACLs or other configuration information.

A count is kept of the number of successful PRLIs from the remote port.
Providers are called back with an implicit PRLO when the remote port
is about to be deleted or has been reset.

fc_lport_recv_req() now sends incoming FC-4 requests to FC-4 providers,
and there is a built-in provider always registered for handling
incoming ELS requests.

The call to provider recv() routines uses rcu_read_lock()
so that providers aren't removed during the call.  That lock is very
cheap and shouldn't affect any performance on ELS requests.
Providers can rely on the RCU lock to protect a session lookup as well.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12 11:00:40 -06:00
Randy Dunlap 55204909bb [SCSI] libfc: fix sparse static and non-ANSI warnings
Fix sparse warning for non-ANSI function declaration.
Declare workqueue structs as static.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc:	Robert Love <robert.w.love@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12 11:00:08 -06:00
Hillf Danton 28a4af1e43 [SCSI] libfc: Cleanup return paths in fc_rport_error_retry
This patch makes it so that we only have one call to
fc_rport_error. This patch does not completely
consolidate return statements, there is still one return
used when not calling fc_rport_error, but alternative
solutions made the code more confusing.

[ Patch modified by Robert Love ]
[ Patch title and commit message edited by Robert Love
  to make it more relevant ]

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-12 10:57:22 -06:00
Hillf Danton 0e9e3d3b15 [SCSI] libfc: fix memory leakage in remote port
There seems rdata should get put before return.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-12-21 12:24:24 -06:00
Mike Christie 73b4376477 [SCSI] libfc: fix setting of rport dev loss
There does not seem to be a reason why libfc adds a 5
second delay to the user requested value for the dev loss
tmo. There also does not seem to be a reason to allow
setting it to 0 (or really close).

This patch removes the extra 5 sec delay, and for 0 it
sets it to 1 like other fc drivers. We should actually
be able to set it to 0 since the queue_delayed_work API
will just call queue_work, but other drivers set it to 1 in
that case.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-10-25 15:11:29 -05:00
Linus Torvalds 3cfc2c42c1 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (48 commits)
  Documentation: update broken web addresses.
  fix comment typo "choosed" -> "chosen"
  hostap:hostap_hw.c Fix typo in comment
  Fix spelling contorller -> controller in comments
  Kconfig.debug: FAIL_IO_TIMEOUT: typo Faul -> Fault
  fs/Kconfig: Fix typo Userpace -> Userspace
  Removing dead MACH_U300_BS26
  drivers/infiniband: Remove unnecessary casts of private_data
  fs/ocfs2: Remove unnecessary casts of private_data
  libfc: use ARRAY_SIZE
  scsi: bfa: use ARRAY_SIZE
  drm: i915: use ARRAY_SIZE
  drm: drm_edid: use ARRAY_SIZE
  synclink: use ARRAY_SIZE
  block: cciss: use ARRAY_SIZE
  comment typo fixes: charater => character
  fix comment typos concerning "challenge"
  arm: plat-spear: fix typo in kerneldoc
  reiserfs: typo comment fix
  update email address
  ...
2010-08-04 15:31:02 -07:00
Joe Eykholt 9226115695 [SCSI] libfc: don't require a local exchange for incoming requests
Incoming requests shouldn't require a local exchange if we're
just going to reply with one or two frames and don't expect
anything further.  Don't allocate exchanges for such requests
until requested by the upper-layer protocol.

The sequence is always NULL for new requests, so remove
that as an argument to request handlers.

Also change the first argument to lport->tt.seq_els_rsp_send
from the sequence pointer to the received frame pointer, to
supply the exchange IDs and destination ID info.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28 09:06:02 -05:00
Joe Eykholt 24f089e2f2 [SCSI] libfc: add fc_fill_reply_hdr() and fc_fill_hdr()
Add functions to fill in an FC header given a request header.
These reduces code lines in fc_lport and fc_rport and works
without an exchange/sequence assigned.

fc_fill_reply_hdr() fills a header for a final reply frame.

fc_fill_hdr() which is similar but allows specifying the
f_ctl parameter.

Add defines for F_CTL values FC_FCTL_REQ and FC_FCTL_RESP.
These can be used for most request and response sequences.

v2 of patch adds a line to copy the frame encapsulation
info from the received frame.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28 09:06:00 -05:00
Joe Eykholt 251748a99e [SCSI] libfc: add fc_frame_sid() and fc_frame_did() functions
To pave the way for eliminating exchanges from incoming requests,
add simple inline fc_frame_sid() and fc_frame_did() functions
which get the FC_IDs from the frame header.  This can be almost
as efficient as getting them from the sequence/exchange.

Move ntohll, htonll, ntoh24 and hton24 to <scsi/fc_frame.h>
since we need them there and that's included by <scsi/libfc.h>

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28 09:05:59 -05:00
Joe Eykholt 079ecd8cfe [SCSI] libfc: eliminate rport LOGO state
The LOGO state hasn't been used in a while, except in a brief
transition to DELETE state while holding the rport mutex.
All port LOGO responses have been ignored as well as any timeout
if we don't get a response.

So this patch just removes LOGO state and simplifies the response handler.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28 09:05:58 -05:00
Joe Eykholt a7b12a279f [SCSI] libfc: add FLOGI state to rport for VN2VN
The FIP proposal for VN_port to VN_port point-to-multipoint
operation requires a FLOGI be sent to each remote port.
The FLOGI is sent with the assigned S_ID and D_IDs of the
local and remote ports.  This and the response get
FIP-encapsulated for Ethernet.

Add FLOGI state to the remote port state machine.
This will be skipped if not in point-to-multipoint mode.

To reduce a little duplication between PLOGI and FLOGI
response handling, added fc_rport_login_complete(), which
handles the parameters for the rdata struct.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28 09:05:53 -05:00
Joe Eykholt f90377abca [SCSI] libfc: provide space for LLD after remote port structure
Add pre-zeroed space after the allocation for fc_rport_priv
for use by the lower-level driver.

This is primarily for VN2VN FIP mode, but could be used in
other ways someday.

The space required is specified in lport->rport_priv_size.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28 09:05:49 -05:00
Joe Eykholt 42e9041467 [SCSI] libfc: convert rport lookup to be RCU safe
To allow LLD to do lookups on rports without grabbing a mutex,
make them RCU-safe.  The caller of lport->tt.rport_lookup will
have the choice of holding disc_mutex or the rcu_read_lock().

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-28 09:05:48 -05:00
Joe Eykholt f034260db3 [SCSI] libfc: fix indefinite rport restart
Remote ports were restarting indefinitely after getting
rejects in PRLI.

Fix by adding a counter of restarts and limiting that with
the port login retry limit as well.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-27 12:01:53 -05:00
Joe Eykholt 4b2164d4d2 [SCSI] libfc: Fix remote port restart problem
This patch somewhat combines two fixes to remote port handing in libfc.

The first problem was that rport work could be queued on a deleted
and freed rport.  This is handled by not resetting rdata->event
ton NONE if the rdata is about to be deleted.

However, that fix led to the second problem, described by
Bhanu Gollapudi, as follows:
> Here is the sequence of events. T1 is first LOGO receive thread, T2 is
> fc_rport_work() scheduled by T1 and T3 is second LOGO receive thread and
> T4 is fc_rport_work scheduled by T3.
>
> 1. (T1)Received 1st LOGO in state Ready
> 2. (T1)Delete port & enter to RESTART state.
> 3. (T1)schdule event_work, since event is RPORT_EV_NONE.
> 4. (T1)set event = RPORT_EV_LOGO
> 5. (T1)Enter RESTART state as disc_id is set.
> 6. (T2)remember to PLOGI, and set event = RPORT_EV_NONE
> 6. (T3)Received 2nd LOGO
> 7. (T3)Delete Port & enter to RESTART state.
> 8. (T3)schedule event_work, since event is RPORT_EV_NONE.
> 9. (T3)Enter RESTART state as disc_id is set.
> 9. (T3)set event = RPORT_EV_LOGO
> 10.(T2)work restart, enter PLOGI state and issues PLOGI
> 11.(T4)Since state is not RESTART anymore, restart is not set, and the
> event is not reset to RPORT_EV_NONE. (current event is RPORT_EV_LOGO).
> 12. Now, PLOGI succeeds and fc_rport_enter_ready() will not schedule
> event_work, and hence the rport will never be created, eventually losing
> the target after dev_loss_tmo.

So, the problem here is that we were tracking the desire for
the rport be restarted by state RESTART, which was otherwise
equivalent to DELETE.  A contributing factor is that we dropped
the lock between steps 6 and 10 in thread T2, which allows the
state to change, and we didn't completely re-evaluate then.

This is hopefully corrected by the following minor redesign:

Simplify the rport restart logic by making the decision to
restart after deleting the transport rport.  That decision
is based on a new STARTED flag that indicates fc_rport_login()
has been called and fc_rport_logoff() has not been called
since then.  This replaces the need for the RESTART state.

Only restart if the rdata is still in DELETED state
and only if it still has the STARTED flag set.

Also now, since we clear the event code much later in the
work thread, allow for the possibility that the rport may
have become READY again via incoming PLOGI, and if so,
queue another event to handle that.

In the problem scenario, the second LOGO received will
cause the LOGO event to occur again.

Reported-by: Bhanu Gollapudi <bprakash@broadcom.com>
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-27 12:01:52 -05:00
Bhanu Prakash Gollapudi f8fc6c2c99 [SCSI] libfc: Handle unsolicited PRLO request
Resubmitting after incorporating Joe's review comment.

Unsolicited PRLO request is now handled by sending LS_ACC,
and then relogin to the remote port if an N-port login
session exists for that remote port.

Note that this patch should be applied on top of Joe Eykholt's
"Fix remote port restart problem" patch.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-27 12:01:46 -05:00
Bhanu Prakash Gollapudi 618461c02b [SCSI] libfc: Honor LS_ACC response codes for PRLI
As per FC-LS Rev 1.62 table 46, response codes are handled as follows:

1. If the Req executed is true, PRLI is accepted.
2. If Req executed is not set,  if resp code is 5,
   PRLI is not retried and port is logged out.
3. If resp code is anything apart from 1 or 5, PRLI is retired
   upto max retry count.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-27 12:01:45 -05:00
Bhanu Prakash Gollapudi 292e40b956 [SCSI] libfc: Retry a rejected PRLI request
Retry upto max_rport_retry_count when a target responds with
LS_RJT for a PRLI request.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-27 12:01:44 -05:00
Uwe Kleine-König 732bee7af3 fix typos concerning "hierarchy"
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-06-16 18:03:14 +02:00
Joe Eykholt a2f6a024e1 [SCSI] libfc: recode incoming PRLI handling
Reduce indentation in fc_rport_recv_prli_req() using gotos.
Also add payload length checks.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-04-11 09:23:33 -05:00
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00
Hugh Daschbach 3b709150b7 [SCSI] libfc: Fix e_d_tov ns -> ms scaling factor in PLOGI response.
Both PLOGI and RTV response processing conditionally scale e_d_tov,
but use different scaling factors.  The scaling factor is correct in
RTV response processing.  Bring PLOGI e_d_tov scaling in line with RTV
common service parameter inspection.

Signed-off-by: Hugh Daschbach <hdasch@broadcom.com>
Acked-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-02-17 09:56:59 -06:00
Abhijeet Joglekar 5543c72e2b [SCSI] libfc: remote port gets stuck in restart state without really restarting
We ran into a scenario where a remote port goes into RESTART state, but
never gets added to scsi transport. The running vmcore showed the following:
a) Port was in RESTART state
b) rdata->event was STOP
c) no work gets scheduled for the remote work to fc_rport_work

After this point, shut/no-shut of the remote port did not cause the port
to get re-discovered. The port would move betwen DELETE and RESTART states,
but the event would always be STOP, no work would get scheduled to
fc_rport_work and the port would not get added to scsi_transport.

The problem is that rdata->event is not set to NONE after a port is
restarted. After this point, no more work gets scheduled for the remote port
since new work is scheduled only if rdata->event is non-NONE. So, the event
and state keep changing, but fc_rport_work does not get scheduled to actually
handle the event.

Here's a transition of states that explains the above observation:

) Port is first in READY State, event is NONE

2) RSCN on shut, port goes to DELETED, event is stop

3) Before fc_rport_work runs, RSCN on no-shut, port goes to RESTART, event is
still STOP

4) fc_rport_work gets scheduled, removes the port from transport, sees state
as RESTART, begins the PLOGI state machine, event remains as STOP (event NOT
changed to NONE, this is the bug)

5) Plogi state machine completes, port state goes to READY, event goes to
READY, but no work is scheduled since event was STOP (non-NONE) before.
Fc_rport_work is not scheduled, port remains in READY state, but is not added
to transport.

Things are broken at this point. Libfc rport is ready, but no transport rport
created.

6) now a shut causes port state to change to DELETE, event to change to STOP,
no work gets scheduled

7) no-shut causes port state to change to RESTART, event remains at STOP,
no work gets scheduled

(6) and (7) now get repeated everytime we do shut/no-shut. No way to get out
of this state. Fcc reset does not help too.

Only way to get out is to load/unload module.

Fix is to set rdata->event to NONE while processing the STOP/LOGO/FAILED
events, inside the discovery and rport locks.

Signed-off-by: Abhijeet Joglekar <abjoglek@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-12 16:29:47 -06:00
Yi Zou 63e27fb80c [SCSI] libfc: add support of receiving ELS_RLS
Upon receiving ELS_RLS, send the Link Error Status Block (LESB) back.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:01:59 -06:00
Joe Eykholt b94f8951bf [SCSI] libfc fcoe: increase ELS and CT timeouts
The FC-LS spec. says ELS timeouts should be 2 x R_A_TOV.
The FC-GS spec. says CT timeouts should be 3 x R_A_TOV.

We've been using E_D_TOV for both of those.

Change for all ELS and CT requests except FLOGI, which we
leave at 2 seconds (using E_D_TOV).  One could argue that
R_A_TOV is locally determined until after FLOGI succeeds.

This does change FLOGI for vports which becomes FDISC.
This does not change the REC/SRR timeout which is 2 seconds.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:01:27 -06:00
Robert Love 3a3b42bf89 [SCSI] libfc: Formatting cleanups across libfc
This patch makes a variety of cleanup changes to all libfc files.

This patch adds kernel-doc headers to all functions lacking them
and attempts to better format existing headers. It also add kernel-doc
headers to structures.

This patch ensures that the current naming conventions for local ports,
remote ports and remote port private data is upheld in the following
manner.

struct               instance (i.e. variable name)
--------------------------------------------------
fc_lport                      lport
fc_rport                      rport
fc_rport_libfc_priv           rpriv
fc_rport_priv                 rdata

I also renamed dns_rp and ptp_rp to dns_rdata and ptp_rdata
respectively.

I used emacs 'indent-region' and 'tabify' on all libfc files
to correct spacing alignments.

I feel sorry for anyone attempting to review this patch.

Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:01:07 -06:00
Robert Love 8866a5d907 [SCSI] libfc: Add libfc/fc_libfc.[ch] for libfc internal routines
include/scsi/libfc.h is currently loaded with common code
shared between libfc's sub-modules as well as shared between
libfc and fcoe. Previous patches attempted to move out
non-common code. This patch creates two files for common
libfc routines that will not be shared with fcoe, fnic or
any other LLDs.

Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:00:55 -06:00
Joe Eykholt b4a9c7ede9 [SCSI] libfc: fix free of fc_rport_priv with timer pending
Timer crashes were caused by freeing a struct fc_rport_priv
with a timer pending, causing the timer facility list to be
corrupted.  This was during FC uplink flap tests with a lot
of targets.

After discovery, we were doing an PLOGI on an rdata that was
in DELETE state but not yet removed from the lookup list.
This moved the rdata from DELETE state to PLOGI state.
If the PLOGI exchange allocation failed and needed to be
retried, the timer scheduling could race with the free
being done by fc_rport_work().

When fc_rport_login() is called on a rport in DELETE state,
move it to a new state RESTART.  In fc_rport_work, when
handling a LOGO, STOPPED or FAILED event, look for restart
state.  In the RESTART case, don't take the rdata off the
list and after the transport remote port is deleted and
exchanges are reset, re-login to the remote port.

Note that the new RESTART state also corrects a problem we
had when re-discovering a port that had moved to DELETE state.
In that case, a new rdata was created, but the old rdata
would do an exchange manager reset affecting the FC_ID
for both the new rdata and old rdata.  With the new state,
the new port isn't logged into until after any old exchanges
are reset.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:00:37 -06:00
Chris Leech 8f550f937e [SCSI] libfc: fix memory corruption caused by double frees and bad error handling
I was running into several different panics under stress, which I traced down
to a few different possible slab corruption issues in error handling paths.
I have not yet looked into why these exchange sends fail, but with these
fixes my test system is much more stable under stress than before.

fc_elsct_send() could fail and either leave the passed in frame intact
(failure in fc_ct/els_fill) or the frame could have been freed if the
failure was is fc_exch_seq_send().  The caller had no way of knowing, and
there was a potential double free in the error handling in fc_fcp_rec().

Make fc_elsct_send() always free the frame before returning, and remove the
fc_frame_free() call in fc_fcp_rec().

While fc_exch_seq_send() did always consume the frame, there were double free
bugs in the error handling of fc_fcp_cmd_send() and fc_fcp_srr() as well.

Numerous calls to error handling routines (fc_disc_error(),
fc_lport_error(), fc_rport_error_retry() ) were passing in a frame pointer that
had already been freed in the case of an error.  I have changed the call
sites to pass in a NULL pointer, but there may be more appropriate error
codes to use.

Question:  Why do these error routines take a frame pointer anyway?  I
understand passing in a pointer encoded error to the response handlers, but
the error routines take no action on a valid pointer and should never be
called that way.

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:00:34 -06:00
Robert Love 473e28563f [SCSI] libfc, fcoe: Don't EXPORT_SYMBOLS unnecessarily
These are a few functions that were not used by other
modules. They did not need to be exported so this patch
removes the EXPORT_SYMBOLS call for each.

Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:00:24 -06:00
Joe Eykholt 85b5893ca9 [SCSI] libfc: fix typo in retry check on received PRLI
A received Fibre Channel ELS PRLI request contains a bit that
indicates whether the remote port supports certain retry processing
sequences.  The test for this bit was somehow coded to use multiply
instead of AND!

This case would apply only for target mode operation, and it is
unlikely to be noticed as an initiator.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:00:22 -06:00
Joe Eykholt 8abbe3a423 [SCSI] libfc: fix handling of incoming Discover Address (ADISC) requests
The local port facility has been replying to ADISC requests without
looking to see if the remote port is logged in.  This is incorrect.
An ADISC request requires PLOGI first.  It should be rejected if
the sending remote port is not logged in.

This is like other incoming requests that require login, all of
which should be handled in the remote port module.

Move the ADISC request handling from fc_lport.c to fc_rport.c.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-10 12:08:02 -05:00
Joe Eykholt 370c3bd05c [SCSI] libfc: use ADISC to verify rport login state
When rport_login is called on an rport that is already thought
to be logged in, use ADISC.  If that fails, redo PLOGI.
This is less disruptive after fabric changes that don't affect
the state of the target.

Implement the sending of ADISC via fc_els_fill.

Add ADISC state to the rport state machine.  This is entered from READY
and returns to READY after successful completion.  If it fails, the rport
is either logged off and deleted or re-does PLOGI.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-10 12:08:02 -05:00
Joe Eykholt 68a1750b46 [SCSI] libfc: LOGO response code had extraeous enter_rtv
fc_rport_logo_resp() had a call to fc_rport_enter_rtv() if the
LOGO was accepted.  This must've been a copy/paste mistake, but
it didn't matter since we don't stay in the LOGO state long enough
to hit this code.

Change fc_rport_logo_resp() to just enter the delete state
no matter what.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-10 12:08:01 -05:00