On 12/1/20 6:53 PM, Tyrel Datwyler wrote:
> In general the client needs to send Cancel MADs and task management
> commands down the same channel as the command(s) intended to cancel or
> abort. The client assigns cancel keys per LUN and thus must send a
> Cancel down each channel commands were submitted for that LUN. Further,
> the client then must wait for those cancel completions prior to
> submitting a LUN RESET or ABORT TASK SET.
>
> Allocate event pointers for each possible scsi channel and assign an
> event for each channel that requires a cancel. Wait for completion each
> submitted cancel.
>
> Signed-off-by: Tyrel Datwyler <tyr...@linux.ibm.com>
> ---
> drivers/scsi/ibmvscsi/ibmvfc.c | 106 +++++++++++++++++++++------------
> 1 file changed, 68 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
> index 0b6284020f06..97e8eed04b01 100644
> --- a/drivers/scsi/ibmvscsi/ibmvfc.c
> +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
> @@ -2339,32 +2339,52 @@ static int ibmvfc_cancel_all(struct scsi_device
> *sdev, int type)
> {
> struct ibmvfc_host *vhost = shost_priv(sdev->host);
> struct ibmvfc_event *evt, *found_evt;
> - union ibmvfc_iu rsp;
> - int rsp_rc = -EBUSY;
> + struct ibmvfc_event **evt_list;
> + union ibmvfc_iu *rsp;
> + int rsp_rc = 0;
> unsigned long flags;
> u16 status;
> + int num_hwq = 1;
> + int i;
> + int ret = 0;
>
> ENTER;
> spin_lock_irqsave(vhost->host->host_lock, flags);
> - found_evt = NULL;
> - list_for_each_entry(evt, &vhost->sent, queue) {
> - if (evt->cmnd && evt->cmnd->device == sdev) {
> - found_evt = evt;
> - break;
> + if (vhost->using_channels && vhost->scsi_scrqs.active_queues)
> + num_hwq = vhost->scsi_scrqs.active_queues;
> +
> + evt_list = kcalloc(num_hwq, sizeof(*evt_list), GFP_KERNE> + rsp =
> kcalloc(num_hwq, sizeof(*rsp), GFP_KERNEL);
Can't this just go on the stack? We don't want to be allocating memory
during error recovery. Or, alternatively, you could put this in the
vhost structure and protect it with a mutex. We only have enough events
to single thread these anyway.
> +
> + for (i = 0; i < num_hwq; i++) {
> + sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands
> on queue %d.\n", i);
Prior to this patch, if there was nothing outstanding to the device and
cancel_all was called,
no messages would get printed. This is changing that behavior. Is that
intentional? Additionally,
it looks like this will get a lot more vebose, logging a message for each hw
queue, regardless
of whether there was anything outstanding. Perhaps you want to move this down
to after the check
for !found_evt?
> +
> + found_evt = NULL;
> + list_for_each_entry(evt, &vhost->sent, queue) {
> + if (evt->cmnd && evt->cmnd->device == sdev && evt->hwq
> == i) {
> + found_evt = evt;
> + break;
> + }
> }
> - }
>
--
Brian King
Power Linux I/O
IBM Linux Technology Center
