From: Saurav Kashyap <skashyap@xxxxxxxxxxx>
The first invocation of function find_first_zero_bit will return 0 and
queue_id gets set to 0.
An index of queue_pair_map also get sets to 0.
qpair_id = find_first_zero_bit(ha->qpair_qid_map, ha->max_qpairs);
set_bit(qpair_id, ha->qpair_qid_map);
ha->queue_pair_map[qpair_id] = qpair;
In the alloc_queue callback driver checks the map, if queue is already
allocated.
ha->queue_pair_map[qidx]
This works fine as long as max_qpairs is greater than nvme_max_hw_queues(8).
Since the size of the queue_pair_map is equal to max_qpair. In case, nr_cpus
is less than 8, max_qpairs values goes less than 8, this creates wrong value
returns as qpair.
[ 1572.353669] qla2xxx [0000:24:00.3]-2121:6: Returning existing qpair of 4e00000000000000 for idx=2
[ 1572.354458] general protection fault: 0000 [#1] SMP PTI
[ 1572.354461] CPU: 1 PID: 44 Comm: kworker/1:1H Kdump: loaded Tainted: G IOE --------- - - 4.18.0-304.el8.x86_64 #1
[ 1572.354462] Hardware name: HP ProLiant DL380p Gen8, BIOS P70 03/01/2013
[ 1572.354467] Workqueue: kblockd blk_mq_run_work_fn
[ 1572.354485] RIP: 0010:qla_nvme_post_cmd+0x92/0x760 [qla2xxx]
[ 1572.354486] Code: 84 24 5c 01 00 00 00 00 b8 0a 74 1e 66 83 79 48 00 0f 85 a8 03 00 00 48 8b 44 24 08 48 89 ee 4c 89 e7 8b 50 24 e8 5e 8e 00 00 <f0> 41 ff 47 04 0f ae f0 41 f6 47 24 04 74 19 f0 41 ff 4f 04 b8 f0
[ 1572.354487] RSP: 0018:ffff9c81c645fc90 EFLAGS: 00010246
[ 1572.354489] RAX: 0000000000000001 RBX: ffff8ea3e5070138 RCX: 0000000000000001
[ 1572.354490] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8ea4c866b800
[ 1572.354491] RBP: ffff8ea4c866b800 R08: 0000000000005010 R09: ffff8ea4c866b800
[ 1572.354492] R10: 0000000000000001 R11: 000000069d1ca3ff R12: ffff8ea4bc460000
[ 1572.354493] R13: ffff8ea3e50702b0 R14: ffff8ea4c4c16a58 R15: 4e00000000000000
[ 1572.354494] FS: 0000000000000000(0000) GS:ffff8ea4dfd00000(0000) knlGS:0000000000000000
[ 1572.354495] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1572.354496] CR2: 000055884504fa58 CR3: 00000005a1410001 CR4: 00000000000606e0
[ 1572.354497] Call Trace:
[ 1572.354503] ? check_preempt_curr+0x62/0x90
[ 1572.354506] ? dma_direct_map_sg+0x72/0x1f0
[ 1572.354509] ? nvme_fc_start_fcp_op.part.32+0x175/0x460 [nvme_fc]
[ 1572.354511] ? blk_mq_dispatch_rq_list+0x11c/0x730
[ 1572.354515] ? __switch_to_asm+0x35/0x70
[ 1572.354516] ? __switch_to_asm+0x41/0x70
[ 1572.354518] ? __switch_to_asm+0x35/0x70
[ 1572.354519] ? __switch_to_asm+0x41/0x70
[ 1572.354521] ? __switch_to_asm+0x35/0x70
[ 1572.354522] ? __switch_to_asm+0x41/0x70
[ 1572.354523] ? __switch_to_asm+0x35/0x70
[ 1572.354525] ? entry_SYSCALL_64_after_hwframe+0xb9/0xca
[ 1572.354527] ? __switch_to_asm+0x41/0x70
[ 1572.354529] ? __blk_mq_sched_dispatch_requests+0xc6/0x170
[ 1572.354531] ? blk_mq_sched_dispatch_requests+0x30/0x60
[ 1572.354532] ? __blk_mq_run_hw_queue+0x51/0xd0
[ 1572.354535] ? process_one_work+0x1a7/0x360
[ 1572.354537] ? create_worker+0x1a0/0x1a0
[ 1572.354538] ? worker_thread+0x30/0x390
[ 1572.354540] ? create_worker+0x1a0/0x1a0
[ 1572.354541] ? kthread+0x116/0x130
[ 1572.354543] ? kthread_flush_work_fn+0x10/0x10
[ 1572.354545] ? ret_from_fork+0x35/0x40
Fix is to use index 0 for admin and first IO queue.
Fixes: e84067d743010 (“scsi: qla2xxx: Add FC-NVMe F/W initialization and transport registration”)
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Saurav Kashyap <skashyap@xxxxxxxxxxx>
Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
---
drivers/scsi/qla2xxx/qla_nvme.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 94e350ef3028..04b766b8a471 100644
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -91,8 +91,9 @@ static int qla_nvme_alloc_queue(struct nvme_fc_local_port *lport,
struct qla_hw_data *ha;
struct qla_qpair *qpair;
- if (!qidx)
- qidx++;
+ /* Map admin queue and 1st IO queue to index 0 */
+ if (qidx)
+ qidx--;
vha = (struct scsi_qla_host *)lport->private;
ha = vha->hw;
--
2.19.0.rc0
