linux-toradex.git/include/target/target_core_fabric.h, branch v4.9.56

target: Fix ordered task target_setup_cmd_from_cdb exception hang

2016-07-20T07:58:38+00:00

If a command with a Simple task attribute is failed due to a Unit
Attention, then a subsequent command with an Ordered task attribute
will hang forever.  The reason for this is that the Unit Attention
status is checked for in target_setup_cmd_from_cdb, before the call
to target_execute_cmd, which calls target_handle_task_attr, which
in turn increments dev->simple_cmds.

However, transport_generic_request_failure still calls
transport_complete_task_attr, which will decrement dev->simple_cmds.
In this case, simple_cmds is now -1.  So when a command with the
Ordered task attribute is sent, target_handle_task_attr sees that
dev->simple_cmds is not 0, so it decides it can't execute the
command until all the (nonexistent) Simple commands have completed.

Reported-by: Michael Cyr 
Tested-by: Michael Cyr 
Reported-by: Bryant G. Ly 
Tested-by: Bryant G. Ly 
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Nicholas Bellinger

Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

2016-05-28T19:04:17+00:00

Pull SCSI target updates from Nicholas Bellinger:
 "Here are the outstanding target pending updates for v4.7-rc1.

  The highlights this round include:

   - Allow external PR/ALUA metadata path be defined at runtime via top
     level configfs attribute (Lee)
   - Fix target session shutdown bug for ib_srpt multi-channel (hch)
   - Make TFO close_session() and shutdown_session() optional (hch)
   - Drop se_sess->sess_kref + convert tcm_qla2xxx to internal kref
     (hch)
   - Add tcm_qla2xxx endpoint attribute for basic FC jammer (Laurence)
   - Refactor iscsi-target RX/TX PDU encode/decode into common code
     (Varun)
   - Extend iscsit_transport with xmit_pdu, release_cmd, get_rx_pdu,
     validate_parameters, and get_r2t_ttt for generic ISO offload
     (Varun)
   - Initial merge of cxgb iscsi-segment offload target driver (Varun)

  The bulk of the changes are Chelsio's new driver, along with a number
  of iscsi-target common code improvements made by Varun + Co along the
  way"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (29 commits)
  iscsi-target: Fix early sk_data_ready LOGIN_FLAGS_READY race
  cxgbit: Use type ISCSI_CXGBIT + cxgbit tpg_np attribute
  iscsi-target: Convert transport drivers to signal rdma_shutdown
  iscsi-target: Make iscsi_tpg_np driver show/store use generic code
  tcm_qla2xxx Add SCSI command jammer/discard capability
  iscsi-target: graceful disconnect on invalid mapping to iovec
  target: need_to_release is always false, remove redundant check and kfree
  target: remove sess_kref and ->shutdown_session
  iscsi-target: remove usage of ->shutdown_session
  tcm_qla2xxx: introduce a private sess_kref
  target: make close_session optional
  target: make ->shutdown_session optional
  target: remove acl_stop
  target: consolidate and fix session shutdown
  cxgbit: add files for cxgbit.ko
  iscsi-target: export symbols
  iscsi-target: call complete on conn_logout_comp
  iscsi-target: clear tx_thread_active
  iscsi-target: add new offload transport type
  iscsi-target: use conn_transport->transport_type in text rsp
  ...

target: enhance and export target_alloc_sgl/target_free_sgl

2016-05-13T17:37:19+00:00

The SRP target driver will need to allocate and chain it's own SGLs soon.
For this export target_alloc_sgl, and add a new argument to it so that it
can allocate an additional chain entry that doesn't point to a page.  Also
export transport_free_sgl after renaming it to target_free_sgl to free
these SGLs again.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Bart Van Assche 
Signed-off-by: Doug Ledford

target: remove sess_kref and ->shutdown_session

2016-05-10T08:19:49+00:00

Both of them are unused now that drivers handle any delayed session
shutdown internally.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: add a new add_wwn_groups fabrics method

2016-03-31T03:06:44+00:00

We need to have the WWN fully initialized before addig default groups to it,
so add a new method to add these groups after the WWN has been initialized.
Also remove the default groups in the core while we're at it.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: remove ->fabric_cleanup_nodeacl

2016-03-31T03:06:43+00:00

Instead we can clean up the list of default ACLs in core code.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: Add target_alloc_session() helper function

2016-02-27T22:59:42+00:00

Based on HCH's original patch, this adds a full version to
support percpu-ida tag pre-allocation and callback function
pointer into fabric driver code to complete session setup.

Reported-by: Christoph Hellwig 
Cc: Sagi Grimberg 
Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Andy Grover 
Signed-off-by: Nicholas Bellinger

target: Obtain se_node_acl->acl_kref during get_initiator_node_acl

2016-01-20T09:34:15+00:00

This patch addresses a long standing race where obtaining
se_node_acl->acl_kref in __transport_register_session()
happens a bit too late, and leaves open the potential
for core_tpg_del_initiator_node_acl() to hit a NULL
pointer dereference.

Instead, take ->acl_kref in core_tpg_get_initiator_node_acl()
while se_portal_group->acl_node_mutex is held, and move the
final target_put_nacl() from transport_deregister_session()
into transport_free_session() so that fabric driver login
failure handling using the modern method to still work
as expected.

Also, update core_tpg_get_initiator_node_acl() to take
an extra reference for dynamically generated acls for
demo-mode, before returning to fabric caller.  Also
update iscsi-target sendtargets special case handling
to use target_tpg_has_node_acl() when checking if
demo_mode_discovery == true during discovery lookup.

Note the existing wait_for_completion(&acl->acl_free_comp)
in core_tpg_del_initiator_node_acl() does not change.

Cc: Sagi Grimberg 
Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Andy Grover 
Cc: Mike Christie 
Signed-off-by: Nicholas Bellinger

target: Convert ACL change queue_depth se_session reference usage

2016-01-20T09:34:14+00:00

This patch converts core_tpg_set_initiator_node_queue_depth()
to use struct se_node_acl->acl_sess_list when performing
explicit se_tpg_tfo->shutdown_session() for active sessions,
in order for new se_node_acl->queue_depth to take effect.

This follows how core_tpg_del_initiator_node_acl() currently
works when invoking se_tpg_tfo->shutdown-session(), and ahead
of the next patch to take se_node_acl->acl_kref during lookup,
the extra get_initiator_node_acl() can go away. In order to
achieve this, go ahead and change target_get_session() to use
kref_get_unless_zero() and propigate up the return value
to know when a session is already being released.

This is because se_node_acl->acl_group is already protecting
se_node_acl->acl_group reference via configfs, and shutdown
within core_tpg_del_initiator_node_acl() won't occur until
sys_write() to core_tpg_set_initiator_node_queue_depth()
attribute returns back to user-space.

Also, drop the left-over iscsi-target hack, and obtain
se_portal_group->session_lock in lio_tpg_shutdown_session()
internally. Remove iscsi-target wrapper and unused se_tpg +
force parameters and associated code.

Reported-by: Christoph Hellwig 
Cc: Sagi Grimberg 
Cc: Hannes Reinecke 
Cc: Andy Grover 
Cc: Mike Christie 
Signed-off-by: Nicholas Bellinger

target: Support aborting tasks with a 64-bit tag

2016-01-07T21:57:54+00:00

Avoid truncating the tag argument of target_submit_tmr() to a
32-bit number if the caller passes a 64-bit number.

Signed-off-by: Bart Van Assche 
Cc: Christoph Hellwig 
Cc: Andy Grover 
Cc: Sagi Grimberg 
Signed-off-by: Nicholas Bellinger