linux.git/drivers/nvme/host/fc.c, branch v4.20

nvme-fc: initialize nvme_req(rq)->ctrl after calling __nvme_fc_init_request()

2018-11-27T17:12:08+00:00

__nvme_fc_init_request() invokes memset() on the nvme_fcp_op_w_sgl structure, which
NULLed-out the nvme_req(req)->ctrl field previously set by nvme_fc_init_request().
This apparently was not referenced until commit faf4a44fff ("nvme: support traffic
based keep-alive") which now results in a crash in nvme_complete_rq():

[ 8386.897130] RIP: 0010:panic+0x220/0x26c
[ 8386.901406] Code: 83 3d 6f ee 72 01 00 74 05 e8 e8 54 02 00 48 c7 c6 40 fd 5b b4 48 c7 c7 d8 8d c6 b3 31e
[ 8386.922359] RSP: 0018:ffff99650019fc40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[ 8386.930804] RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000006
[ 8386.938764] RDX: 0000000000000000 RSI: 0000000000000082 RDI: ffff8e325f8168b0
[ 8386.946725] RBP: ffff99650019fcb0 R08: 0000000000000000 R09: 00000000000004f8
[ 8386.954687] R10: 0000000000000000 R11: ffff99650019f9b8 R12: ffffffffb3c55f3c
[ 8386.962648] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
[ 8386.970613]  oops_end+0xd1/0xe0
[ 8386.974116]  no_context+0x1b2/0x3c0
[ 8386.978006]  do_page_fault+0x32/0x140
[ 8386.982090]  page_fault+0x1e/0x30
[ 8386.985786] RIP: 0010:nvme_complete_rq+0x65/0x1d0 [nvme_core]
[ 8386.992195] Code: 41 bc 03 00 00 00 74 16 0f 86 c3 00 00 00 66 3d 83 00 41 bc 06 00 00 00 0f 85 e7 00 000
[ 8387.013147] RSP: 0018:ffff99650019fe18 EFLAGS: 00010246
[ 8387.018973] RAX: 0000000000000000 RBX: ffff8e322ae51280 RCX: 0000000000000001
[ 8387.026935] RDX: 0000000000000400 RSI: 0000000000000001 RDI: ffff8e322ae51280
[ 8387.034897] RBP: ffff8e322ae51280 R08: 0000000000000000 R09: ffffffffb2f0b890
[ 8387.042859] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[ 8387.050821] R13: 0000000000000100 R14: 0000000000000004 R15: ffff8e2b0446d990
[ 8387.058782]  ? swiotlb_unmap_page+0x40/0x40
[ 8387.063448]  nvme_fc_complete_rq+0x2d/0x70 [nvme_fc]
[ 8387.068986]  blk_done_softirq+0xa1/0xd0
[ 8387.073264]  __do_softirq+0xd6/0x2a9
[ 8387.077251]  run_ksoftirqd+0x26/0x40
[ 8387.081238]  smpboot_thread_fn+0x10e/0x160
[ 8387.085807]  kthread+0xf8/0x130
[ 8387.089309]  ? sort_range+0x20/0x20
[ 8387.093198]  ? kthread_stop+0x110/0x110
[ 8387.097475]  ret_from_fork+0x35/0x40
[ 8387.101462] ---[ end trace 7106b0adf5e422f8 ]---

Fixes: faf4a44fff ("nvme: support traffic based keep-alive")
Signed-off-by: Ewan D. Milne 
Reviewed-by: Hannes Reinecke 
Signed-off-by: Christoph Hellwig

nvme-fc: resolve io failures during connect

2018-11-15T10:37:55+00:00

If an io error occurs on an io issued while connecting, recovery
of the io falls flat as the state checking ends up nooping the error
handler.

Create an err_work work item that is scheduled upon an io error while
connecting. The work thread terminates all io on all queues and marks
the queues as not connected.  The termination of the io will return
back to the callee, which will then back out of the connection attempt
and will reschedule, if possible, the connection attempt.

The changes:
- in case there are several commands hitting the error handler, a
  state flag is kept so that the error work is only scheduled once,
  on the first error. The subsequent errors can be ignored.
- The calling sequence to stop keep alive and terminate the queues
  and their io is lifted from the reset routine. Made a small
  service routine used by both reset and err_work.
- During debugging, found that the teardown path can reference
  an uninitialized pointer, resulting in a NULL pointer oops.
  The aen_ops weren't initialized yet. Add validation on their
  initialization before calling the teardown routine.

Signed-off-by: James Smart 
Signed-off-by: Christoph Hellwig

nvme-fc: fix request private initialization

2018-11-02T14:14:45+00:00

The patch made to avoid Coverity reporting of out of bounds access
on aen_op moved the assignment of a pointer, leaving it null when it
was subsequently used to calculate a private pointer. Thus the private
pointer was bad.

Move/correct the private pointer initialization to be in sync with the
patch.

Fixes: 0d2bdf9f4134 ("nvme-fc: rework the request initialization code")
Signed-off-by: James Smart 
Reviewed-by: Sagi Grimberg 
Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

nvme-fc: rework the request initialization code

2018-10-17T06:58:29+00:00

Instead of setting and then clearing the first_sgl pointer for AEN requests,
leave that pointer zero. This patch does not change how requests are
initialized but avoids that Coverity reports the following complaint for
nvme_fc_init_aen_ops():

CID 1418400 (#1 of 1): Out-of-bounds access (OVERRUN)
4. overrun-buffer-val: Overrunning buffer pointed to by aen_op of 312 bytes by passing it to a function which accesses it at byte offset 312.

Signed-off-by: Bart Van Assche 
Reviewed-by: James Smart 
Signed-off-by: Christoph Hellwig

nvme-fc: introduce struct nvme_fcp_op_w_sgl

2018-10-17T06:58:29+00:00

This patch does not change any functionality but makes the intent of the
code more clear.

Signed-off-by: Bart Van Assche 
Reviewed-by: James Smart 
Signed-off-by: Christoph Hellwig

nvme-fc: fix kernel-doc headers

2018-10-17T06:58:28+00:00

This patch avoids that the kernel-doc tool complains about several
multiple function headers when building with W=1.

Signed-off-by: Bart Van Assche 
Reviewed-by: James Smart 
Signed-off-by: Christoph Hellwig

nvme_fc: add 'nvme_discovery' sysfs attribute to fc transport device

2018-10-01T21:16:11+00:00

The fc transport device should allow for a rediscovery, as userspace
might have lost the events. Example is udev events not handled during
system startup.

This patch add a sysfs entry 'nvme_discovery' on the fc class to
have it replay all udev discovery events for all local port/remote
port address pairs.

Signed-off-by: James Smart 
Signed-off-by: Christoph Hellwig

nvme-fc: fix for a minor typos

2018-10-01T21:16:09+00:00

Signed-off-by: Milan P. Gandhi 
Reviewed-by: James Smart 
Signed-off-by: Christoph Hellwig

Merge tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-block

2018-08-14T17:23:25+00:00

Pull block updates from Jens Axboe:
 "First pull request for this merge window, there will also be a
  followup request with some stragglers.

  This pull request contains:

   - Fix for a thundering heard issue in the wbt block code (Anchal
     Agarwal)

   - A few NVMe pull requests:
      * Improved tracepoints (Keith)
      * Larger inline data support for RDMA (Steve Wise)
      * RDMA setup/teardown fixes (Sagi)
      * Effects log suppor for NVMe target (Chaitanya Kulkarni)
      * Buffered IO suppor for NVMe target (Chaitanya Kulkarni)
      * TP4004 (ANA) support (Christoph)
      * Various NVMe fixes

   - Block io-latency controller support. Much needed support for
     properly containing block devices. (Josef)

   - Series improving how we handle sense information on the stack
     (Kees)

   - Lightnvm fixes and updates/improvements (Mathias/Javier et al)

   - Zoned device support for null_blk (Matias)

   - AIX partition fixes (Mauricio Faria de Oliveira)

   - DIF checksum code made generic (Max Gurtovoy)

   - Add support for discard in iostats (Michael Callahan / Tejun)

   - Set of updates for BFQ (Paolo)

   - Removal of async write support for bsg (Christoph)

   - Bio page dirtying and clone fixups (Christoph)

   - Set of bcache fix/changes (via Coly)

   - Series improving blk-mq queue setup/teardown speed (Ming)

   - Series improving merging performance on blk-mq (Ming)

   - Lots of other fixes and cleanups from a slew of folks"

* tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-block: (190 commits)
  blkcg: Make blkg_root_lookup() work for queues in bypass mode
  bcache: fix error setting writeback_rate through sysfs interface
  null_blk: add lock drop/acquire annotation
  Blk-throttle: reduce tail io latency when iops limit is enforced
  block: paride: pd: mark expected switch fall-throughs
  block: Ensure that a request queue is dissociated from the cgroup controller
  block: Introduce blk_exit_queue()
  blkcg: Introduce blkg_root_lookup()
  block: Remove two superfluous #include directives
  blk-mq: count the hctx as active before allocating tag
  block: bvec_nr_vecs() returns value for wrong slab
  bcache: trivial - remove tailing backslash in macro BTREE_FLAG
  bcache: make the pr_err statement used for ENOENT only in sysfs_attatch section
  bcache: set max writeback rate when I/O request is idle
  bcache: add code comments for bset.c
  bcache: fix mistaken comments in request.c
  bcache: fix mistaken code comments in bcache.h
  bcache: add a comment in super.c
  bcache: avoid unncessary cache prefetch bch_btree_node_get()
  bcache: display rate debug parameters to 0 when writeback is not running
  ...

nvme: if_ready checks to fail io to deleting controller

2018-07-24T11:44:40+00:00

The revised if_ready checks skipped over the case of returning error when
the controller is being deleted.  Instead it was returning BUSY, which
caused the ios to retry, which caused the ns delete to hang waiting for
the ios to drain.

Stack trace of hang looks like:
 kworker/u64:2   D    0    74      2 0x80000000
 Workqueue: nvme-delete-wq nvme_delete_ctrl_work [nvme_core]
 Call Trace:
  ? __schedule+0x26d/0x820
  schedule+0x32/0x80
  blk_mq_freeze_queue_wait+0x36/0x80
  ? remove_wait_queue+0x60/0x60
  blk_cleanup_queue+0x72/0x160
  nvme_ns_remove+0x106/0x140 [nvme_core]
  nvme_remove_namespaces+0x7e/0xa0 [nvme_core]
  nvme_delete_ctrl_work+0x4d/0x80 [nvme_core]
  process_one_work+0x160/0x350
  worker_thread+0x1c3/0x3d0
  kthread+0xf5/0x130
  ? process_one_work+0x350/0x350
  ? kthread_bind+0x10/0x10
  ret_from_fork+0x1f/0x30

Extend nvmf_fail_nonready_command() to supply the controller pointer so
that the controller state can be looked at. Fail any io to a controller
that is deleting.

Fixes: 3bc32bb1186c ("nvme-fabrics: refactor queue ready check")
Fixes: 35897b920c8a ("nvme-fabrics: fix and refine state checks in __nvmf_check_ready")
Signed-off-by: James Smart 
Signed-off-by: Christoph Hellwig 
Tested-by: Ewan D. Milne 
Reviewed-by: Ewan D. Milne