On 10/23/14 00:03, Elliott, Robert (Server Storage) wrote:
-----Original Message-----
From: Bart Van Assche [mailto:bvanass...@acm.org]
Sent: Tuesday, 07 October, 2014 8:07 AM
...
@@ -1927,7 +1931,7 @@ static int srp_queuecommand(struct Scsi_Host
*shost, struct scsi_cmnd *scmnd)
cmd->opcode = SRP_CMD;
cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
- cmd->tag = req->index;
+ cmd->tag = tag;
memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
req->scmnd = scmnd;
...
+static int srp_slave_alloc(struct scsi_device *sdev)
+{
+ sdev->tagged_supported = 1;
+
+ scsi_activate_tcq(sdev, sdev->queue_depth);
+
+ return 0;
+}
+
Have you tested this with scsi_mod.use_blk_mq=n?
Trying similar changes in hpsa, we still receive some INQUIRY commands
submitted through queuecommand with tag -1. They are for devices for
which slave_alloc has not yet been run, implying this work needs to
be done even earlier. Maybe the midlayer is missing a slave_alloc
call somewhere?
Hello Rob,
All my tests with use_blk_mq=n were run with a WARN_ON_ONCE(req->tag <
0) statement present in srp_queuecommand(). I haven't seen any kernel
warning being triggered during the tests I ran.
I also had a look at scsi_alloc_sdev() in drivers/scsi/scsi_scan.c. The
number of statements between queue allocation and the slave_alloc() call
is limited. The only scenario I can think of which could cause
queuecommand() to be invoked before slave_alloc() is a LUN scan
initiated from user space via sysfs due to
scsi_sysfs_device_initialize() being invoked before slave_alloc(). Does
that make sense to you ?
Bart.
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