Commit 7f4ff3d9 authored by Dariusz Stojaczyk's avatar Dariusz Stojaczyk Committed by Ben Walker
Browse files

bdev/virtio: handle missed eventq I/O 



If the host fails to send some events,
the next event it succeeds to send
might have an EVENTS_MISSED flag set.
Once virtio receives such event, it will
schedule a full bus rescan to manually
detect any changes.

Change-Id: Ifa66536f8e2980ad31ee68769f042f08100da54e
Signed-off-by: default avatarDariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/392780


Tested-by: default avatarSPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: default avatarDaniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: default avatarBen Walker <benjamin.walker@intel.com>
parent 166f6e9c

lib/bdev/virtio/bdev_virtio.c

+14 −1
Original line number Diff line number Diff line
@@ -363,6 +363,8 @@ virtio_scsi_dev_get_disk_by_id(struct virtio_scsi_dev *svdev, uint8_t target_id) 
	return NULL;

}



static int virtio_scsi_dev_scan(struct virtio_scsi_dev *svdev,

				bdev_virtio_create_cb cb_fn, void *cb_arg);

static int send_scan_io(struct virtio_scsi_scan_base *base);

static void _virtio_scsi_dev_scan_tgt(struct virtio_scsi_scan_base *base, uint8_t target);

static int _virtio_scsi_dev_scan_next(struct virtio_scsi_scan_base *base);
@@ -778,7 +780,15 @@ bdev_virtio_eventq_io_cpl(struct virtio_scsi_dev *svdev, struct virtio_scsi_even 
		goto out;

	}



	if (ev->event == VIRTIO_SCSI_T_TRANSPORT_RESET) {

	if (ev->event & VIRTIO_SCSI_T_EVENTS_MISSED) {

		ev->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED;

		virtio_scsi_dev_scan(svdev, NULL, NULL);

	}



	switch (ev->event) {

	case VIRTIO_SCSI_T_NO_EVENT:

		break;

	case VIRTIO_SCSI_T_TRANSPORT_RESET:

		switch (ev->reason) {

		case VIRTIO_SCSI_EVT_RESET_RESCAN:

			virtio_scsi_dev_scan_tgt(svdev, ev->lun[1]);
@@ -792,6 +802,9 @@ bdev_virtio_eventq_io_cpl(struct virtio_scsi_dev *svdev, struct virtio_scsi_even 
		default:

			break;

		}

		break;

	default:

		break;

	}



out: