Message-Id: <1423988345-4005-7-git-send-email-bob.liu@oracle.com>
Date:	Sun, 15 Feb 2015 16:19:01 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	xen-devel@...ts.xen.org
Cc:	david.vrabel@...rix.com, linux-kernel@...r.kernel.org,
	roger.pau@...rix.com, konrad.wilk@...cle.com,
	felipe.franciosi@...rix.com, axboe@...com, hch@...radead.org,
	avanzini.arianna@...il.com, Bob Liu <bob.liu@...cle.com>
Subject: [PATCH 06/10] xen/blkfront: pseudo support for multi hardware queues

Prepare patch for multi hardware queues, the ring number was mandatory set to 1.

Signed-off-by: Arianna Avanzini <avanzini.arianna@...il.com>
Signed-off-by: Bob Liu <bob.liu@...cle.com>
---
 drivers/block/xen-blkfront.c | 408 +++++++++++++++++++++++++------------------
 1 file changed, 234 insertions(+), 174 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index aaa4a0e..d551be0 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -143,7 +143,8 @@ struct blkfront_info {
 	unsigned int max_indirect_segments;
 	int is_ready;
 	struct blk_mq_tag_set tag_set;
-	struct blkfront_ring_info rinfo;
+	struct blkfront_ring_info *rinfo;
+	unsigned int nr_rings;
 };
 
 static unsigned int nr_minors;
@@ -176,7 +177,8 @@ static DEFINE_SPINLOCK(minor_lock);
 #define INDIRECT_GREFS(_segs) \
 	((_segs + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME)
 
-static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo);
+static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo, unsigned int segs);
+static int blkfront_gather_indirect(struct blkfront_info *info);
 
 static int get_id_from_freelist(struct blkfront_ring_info *rinfo)
 {
@@ -656,7 +658,7 @@ static int blk_mq_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
 {
 	struct blkfront_info *info = (struct blkfront_info *)data;
 
-	hctx->driver_data = &info->rinfo;
+	hctx->driver_data = &info->rinfo[index];
 	return 0;
 }
 
@@ -915,8 +917,8 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
 
 static void xlvbd_release_gendisk(struct blkfront_info *info)
 {
-	unsigned int minor, nr_minors;
-	struct blkfront_ring_info *rinfo = &info->rinfo;
+	unsigned int minor, nr_minors, i;
+	struct blkfront_ring_info *rinfo;
 
 	if (info->rq == NULL)
 		return;
@@ -924,11 +926,14 @@ static void xlvbd_release_gendisk(struct blkfront_info *info)
 	/* No more blkif_request(). */
 	blk_mq_stop_hw_queues(info->rq);
 
-	/* No more gnttab callback work. */
-	gnttab_cancel_free_callback(&rinfo->callback);
+	for (i = 0; i < info->nr_rings; i++) {
+		rinfo = &info->rinfo[i];
+		/* No more gnttab callback work. */
+		gnttab_cancel_free_callback(&rinfo->callback);
 
-	/* Flush gnttab callback work. Must be done with no locks held. */
-	flush_work(&rinfo->work);
+		/* Flush gnttab callback work. Must be done with no locks held. */
+		flush_work(&rinfo->work);
+	}
 
 	del_gendisk(info->gd);
 
@@ -969,8 +974,8 @@ static void blkif_free(struct blkfront_info *info, int suspend)
 {
 	struct grant *persistent_gnt;
 	struct grant *n;
-	int i, j, segs;
-	struct blkfront_ring_info *rinfo = &info->rinfo;
+	int i, j, segs, rindex;
+	struct blkfront_ring_info *rinfo;
 
 	/* Prevent new requests being issued until we fix things up. */
 	info->connected = suspend ?
@@ -979,97 +984,100 @@ static void blkif_free(struct blkfront_info *info, int suspend)
 	if (info->rq)
 		blk_mq_stop_hw_queues(info->rq);
 
-	spin_lock_irq(&rinfo->io_lock);
-	/* Remove all persistent grants */
-	if (!list_empty(&rinfo->grants)) {
-		list_for_each_entry_safe(persistent_gnt, n,
-				&rinfo->grants, node) {
-			list_del(&persistent_gnt->node);
-			if (persistent_gnt->gref != GRANT_INVALID_REF) {
-				gnttab_end_foreign_access(persistent_gnt->gref,
-						0, 0UL);
-				rinfo->persistent_gnts_c--;
+	for (rindex = 0; rindex < info->nr_rings; rindex++) {
+		rinfo = &info->rinfo[rindex];
+		spin_lock_irq(&rinfo->io_lock);
+		/* Remove all persistent grants */
+		if (!list_empty(&rinfo->grants)) {
+			list_for_each_entry_safe(persistent_gnt, n,
+					&rinfo->grants, node) {
+				list_del(&persistent_gnt->node);
+				if (persistent_gnt->gref != GRANT_INVALID_REF) {
+					gnttab_end_foreign_access(persistent_gnt->gref,
+							0, 0UL);
+					rinfo->persistent_gnts_c--;
+				}
+				if (info->feature_persistent)
+					__free_page(pfn_to_page(persistent_gnt->pfn));
+				kfree(persistent_gnt);
 			}
-			if (info->feature_persistent)
-				__free_page(pfn_to_page(persistent_gnt->pfn));
-			kfree(persistent_gnt);
 		}
-	}
-	BUG_ON(rinfo->persistent_gnts_c != 0);
+		BUG_ON(rinfo->persistent_gnts_c != 0);
 
-	/*
-	 * Remove indirect pages, this only happens when using indirect
-	 * descriptors but not persistent grants
-	 */
-	if (!list_empty(&rinfo->indirect_pages)) {
-		struct page *indirect_page, *n;
-
-		BUG_ON(info->feature_persistent);
-		list_for_each_entry_safe(indirect_page, n, &rinfo->indirect_pages, lru) {
-			list_del(&indirect_page->lru);
-			__free_page(indirect_page);
-		}
-	}
-
-	for (i = 0; i < BLK_RING_SIZE; i++) {
 		/*
-		 * Clear persistent grants present in requests already
-		 * on the shared ring
+		 * Remove indirect pages, this only happens when using indirect
+		 * descriptors but not persistent grants
 		 */
-		if (!rinfo->shadow[i].request)
-			goto free_shadow;
-
-		segs = rinfo->shadow[i].req.operation == BLKIF_OP_INDIRECT ?
-		       rinfo->shadow[i].req.u.indirect.nr_segments :
-		       rinfo->shadow[i].req.u.rw.nr_segments;
-		for (j = 0; j < segs; j++) {
-			persistent_gnt = rinfo->shadow[i].grants_used[j];
-			gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
-			if (info->feature_persistent)
-				__free_page(pfn_to_page(persistent_gnt->pfn));
-			kfree(persistent_gnt);
+		if (!list_empty(&rinfo->indirect_pages)) {
+			struct page *indirect_page, *n;
+
+			BUG_ON(info->feature_persistent);
+			list_for_each_entry_safe(indirect_page, n, &rinfo->indirect_pages, lru) {
+				list_del(&indirect_page->lru);
+				__free_page(indirect_page);
+			}
 		}
 
-		if (rinfo->shadow[i].req.operation != BLKIF_OP_INDIRECT)
+		for (i = 0; i < BLK_RING_SIZE; i++) {
 			/*
-			 * If this is not an indirect operation don't try to
-			 * free indirect segments
+			 * Clear persistent grants present in requests already
+			 * on the shared ring
 			 */
-			goto free_shadow;
+			if (!rinfo->shadow[i].request)
+				goto free_shadow;
+
+			segs = rinfo->shadow[i].req.operation == BLKIF_OP_INDIRECT ?
+				rinfo->shadow[i].req.u.indirect.nr_segments :
+				rinfo->shadow[i].req.u.rw.nr_segments;
+			for (j = 0; j < segs; j++) {
+				persistent_gnt = rinfo->shadow[i].grants_used[j];
+				gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
+				if (info->feature_persistent)
+					__free_page(pfn_to_page(persistent_gnt->pfn));
+				kfree(persistent_gnt);
+			}
 
-		for (j = 0; j < INDIRECT_GREFS(segs); j++) {
-			persistent_gnt = rinfo->shadow[i].indirect_grants[j];
-			gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
-			__free_page(pfn_to_page(persistent_gnt->pfn));
-			kfree(persistent_gnt);
-		}
+			if (rinfo->shadow[i].req.operation != BLKIF_OP_INDIRECT)
+				/*
+				 * If this is not an indirect operation don't try to
+				 * free indirect segments
+				 */
+				goto free_shadow;
+
+			for (j = 0; j < INDIRECT_GREFS(segs); j++) {
+				persistent_gnt = rinfo->shadow[i].indirect_grants[j];
+				gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
+				__free_page(pfn_to_page(persistent_gnt->pfn));
+				kfree(persistent_gnt);
+			}
 
 free_shadow:
-		kfree(rinfo->shadow[i].grants_used);
-		rinfo->shadow[i].grants_used = NULL;
-		kfree(rinfo->shadow[i].indirect_grants);
-		rinfo->shadow[i].indirect_grants = NULL;
-		kfree(rinfo->shadow[i].sg);
-		rinfo->shadow[i].sg = NULL;
-	}
+			kfree(rinfo->shadow[i].grants_used);
+			rinfo->shadow[i].grants_used = NULL;
+			kfree(rinfo->shadow[i].indirect_grants);
+			rinfo->shadow[i].indirect_grants = NULL;
+			kfree(rinfo->shadow[i].sg);
+			rinfo->shadow[i].sg = NULL;
+		}
 
-	/* No more gnttab callback work. */
-	gnttab_cancel_free_callback(&rinfo->callback);
-	spin_unlock_irq(&rinfo->io_lock);
+		/* No more gnttab callback work. */
+		gnttab_cancel_free_callback(&rinfo->callback);
+		spin_unlock_irq(&rinfo->io_lock);
 
-	/* Flush gnttab callback work. Must be done with no locks held. */
-	flush_work(&rinfo->work);
+		/* Flush gnttab callback work. Must be done with no locks held. */
+		flush_work(&rinfo->work);
 
-	/* Free resources associated with old device channel. */
-	if (rinfo->ring_ref != GRANT_INVALID_REF) {
-		gnttab_end_foreign_access(rinfo->ring_ref, 0,
-					  (unsigned long)rinfo->ring.sring);
-		rinfo->ring_ref = GRANT_INVALID_REF;
-		rinfo->ring.sring = NULL;
+		/* Free resources associated with old device channel. */
+		if (rinfo->ring_ref != GRANT_INVALID_REF) {
+			gnttab_end_foreign_access(rinfo->ring_ref, 0,
+					(unsigned long)rinfo->ring.sring);
+			rinfo->ring_ref = GRANT_INVALID_REF;
+			rinfo->ring.sring = NULL;
+		}
+		if (rinfo->irq)
+			unbind_from_irqhandler(rinfo->irq, rinfo);
+		rinfo->evtchn = rinfo->irq = 0;
 	}
-	if (rinfo->irq)
-		unbind_from_irqhandler(rinfo->irq, rinfo);
-	rinfo->evtchn = rinfo->irq = 0;
 
 }
 
@@ -1265,6 +1273,18 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static void destroy_blkring(struct xenbus_device *dev,
+			 struct blkfront_ring_info *rinfo)
+{
+	if (rinfo->irq)
+		unbind_from_irqhandler(rinfo->irq, rinfo);
+	if (rinfo->evtchn)
+		xenbus_free_evtchn(dev, rinfo->evtchn);
+	if (rinfo->ring_ref != GRANT_INVALID_REF)
+		gnttab_end_foreign_access(rinfo->ring_ref, 0, (unsigned long)rinfo->ring.sring);
+	if (rinfo->ring.sring)
+		free_page((unsigned long)rinfo->ring.sring);
+}
 
 static int setup_blkring(struct xenbus_device *dev,
 			 struct blkfront_ring_info *rinfo)
@@ -1305,7 +1325,7 @@ static int setup_blkring(struct xenbus_device *dev,
 
 	return 0;
 fail:
-	blkif_free(rinfo->info, 0);
+	destroy_blkring(dev, rinfo);
 	return err;
 }
 
@@ -1316,31 +1336,40 @@ static int talk_to_blkback(struct xenbus_device *dev,
 {
 	const char *message = NULL;
 	struct xenbus_transaction xbt;
-	int err;
-	struct blkfront_ring_info *rinfo = &info->rinfo;
+	int err, i;
+	struct blkfront_ring_info *rinfo;
 
-	/* Create shared ring, alloc event channel. */
-	err = setup_blkring(dev, rinfo);
-	if (err)
-		goto out;
+	for (i = 0; i < info->nr_rings; i++) {
+		rinfo = &info->rinfo[i];
+		/* Create shared ring, alloc event channel. */
+		err = setup_blkring(dev, rinfo);
+		if (err)
+			goto out;
+	}
 
 again:
 	err = xenbus_transaction_start(&xbt);
 	if (err) {
 		xenbus_dev_fatal(dev, err, "starting transaction");
-		goto destroy_blkring;
+		goto out;
 	}
 
-	err = xenbus_printf(xbt, dev->nodename,
-			    "ring-ref", "%u", rinfo->ring_ref);
-	if (err) {
-		message = "writing ring-ref";
-		goto abort_transaction;
-	}
-	err = xenbus_printf(xbt, dev->nodename,
-			    "event-channel", "%u", rinfo->evtchn);
-	if (err) {
-		message = "writing event-channel";
+	if (info->nr_rings == 1) {
+		rinfo = &info->rinfo[0];
+		err = xenbus_printf(xbt, dev->nodename,
+				"ring-ref", "%u", rinfo->ring_ref);
+		if (err) {
+			message = "writing ring-ref";
+			goto abort_transaction;
+		}
+		err = xenbus_printf(xbt, dev->nodename,
+				"event-channel", "%u", rinfo->evtchn);
+		if (err) {
+			message = "writing event-channel";
+			goto abort_transaction;
+		}
+	} else {
+		/* Not supported at this stage */
 		goto abort_transaction;
 	}
 	err = xenbus_printf(xbt, dev->nodename, "protocol", "%s",
@@ -1360,7 +1389,7 @@ again:
 		if (err == -EAGAIN)
 			goto again;
 		xenbus_dev_fatal(dev, err, "completing transaction");
-		goto destroy_blkring;
+		goto out;
 	}
 
 	xenbus_switch_state(dev, XenbusStateInitialised);
@@ -1371,9 +1400,11 @@ again:
 	xenbus_transaction_end(xbt, 1);
 	if (message)
 		xenbus_dev_fatal(dev, err, "%s", message);
- destroy_blkring:
-	blkif_free(info, 0);
  out:
+	while (--i >= 0) {
+		rinfo = &info->rinfo[i];
+		destroy_blkring(dev, rinfo);
+	}
 	return err;
 }
 
@@ -1386,7 +1417,7 @@ again:
 static int blkfront_probe(struct xenbus_device *dev,
 			  const struct xenbus_device_id *id)
 {
-	int err, vdevice, i;
+	int err, vdevice, i, rindex;
 	struct blkfront_info *info;
 	struct blkfront_ring_info *rinfo;
 
@@ -1437,22 +1468,32 @@ static int blkfront_probe(struct xenbus_device *dev,
 		xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
 		return -ENOMEM;
 	}
-
-	rinfo = &info->rinfo;
 	mutex_init(&info->mutex);
-	spin_lock_init(&rinfo->io_lock);
 	info->xbdev = dev;
 	info->vdevice = vdevice;
-	INIT_LIST_HEAD(&rinfo->grants);
-	INIT_LIST_HEAD(&rinfo->indirect_pages);
-	rinfo->persistent_gnts_c = 0;
 	info->connected = BLKIF_STATE_DISCONNECTED;
-	rinfo->info = info;
-	INIT_WORK(&rinfo->work, blkif_restart_queue);
 
-	for (i = 0; i < BLK_RING_SIZE; i++)
-		rinfo->shadow[i].req.u.rw.id = i+1;
-	rinfo->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
+	info->nr_rings = 1;
+	info->rinfo = kzalloc(sizeof(*rinfo) * info->nr_rings, GFP_KERNEL);
+	if (!info->rinfo) {
+		xenbus_dev_fatal(dev, -ENOMEM, "allocating ring_info structure");
+		kfree(info);
+		return -ENOMEM;
+	}
+
+	for (rindex = 0; rindex < info->nr_rings; rindex++) {
+		rinfo = &info->rinfo[rindex];
+		spin_lock_init(&rinfo->io_lock);
+		INIT_LIST_HEAD(&rinfo->grants);
+		INIT_LIST_HEAD(&rinfo->indirect_pages);
+		rinfo->persistent_gnts_c = 0;
+		rinfo->info = info;
+		INIT_WORK(&rinfo->work, blkif_restart_queue);
+
+		for (i = 0; i < BLK_RING_SIZE; i++)
+			rinfo->shadow[i].req.u.rw.id = i+1;
+		rinfo->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
+	}
 
 	/* Front end dir is a number, which is used as the id. */
 	info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
@@ -1485,7 +1526,7 @@ static void split_bio_end(struct bio *bio, int error)
 
 static int blkif_recover(struct blkfront_info *info)
 {
-	int i;
+	int i, rindex;
 	struct request *req, *n;
 	struct blk_shadow *copy;
 	int rc;
@@ -1495,64 +1536,70 @@ static int blkif_recover(struct blkfront_info *info)
 	int pending, size;
 	struct split_bio *split_bio;
 	struct list_head requests;
-	struct blkfront_ring_info *rinfo = &info->rinfo;
-
-	/* Stage 1: Make a safe copy of the shadow state. */
-	copy = kmemdup(rinfo->shadow, sizeof(rinfo->shadow),
-		       GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
-	if (!copy)
-		return -ENOMEM;
-
-	/* Stage 2: Set up free list. */
-	memset(&rinfo->shadow, 0, sizeof(rinfo->shadow));
-	for (i = 0; i < BLK_RING_SIZE; i++)
-		rinfo->shadow[i].req.u.rw.id = i+1;
-	rinfo->shadow_free = rinfo->ring.req_prod_pvt;
-	rinfo->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
-
-	rc = blkfront_setup_indirect(rinfo);
-	if (rc) {
-		kfree(copy);
-		return rc;
-	}
+	struct blkfront_ring_info *rinfo;
 
-	segs = info->max_indirect_segments ? : BLKIF_MAX_SEGMENTS_PER_REQUEST;
+	segs = blkfront_gather_indirect(info);
 	blk_queue_max_segments(info->rq, segs);
 	bio_list_init(&bio_list);
 	INIT_LIST_HEAD(&requests);
-	for (i = 0; i < BLK_RING_SIZE; i++) {
-		/* Not in use? */
-		if (!copy[i].request)
-			continue;
+	for (rindex = 0; rindex < info->nr_rings; rindex++) {
+		rinfo = &info->rinfo[rindex];
+		/* Stage 1: Make a safe copy of the shadow state. */
+		copy = kmemdup(rinfo->shadow, sizeof(rinfo->shadow),
+				GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
+		if (!copy)
+			return -ENOMEM;
+
+		/* Stage 2: Set up free list. */
+		memset(&rinfo->shadow, 0, sizeof(rinfo->shadow));
+		for (i = 0; i < BLK_RING_SIZE; i++)
+			rinfo->shadow[i].req.u.rw.id = i+1;
+		rinfo->shadow_free = rinfo->ring.req_prod_pvt;
+		rinfo->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
+
+		rc = blkfront_setup_indirect(rinfo, segs);
+		if (rc) {
+			kfree(copy);
+			return rc;
+		}
+
+		for (i = 0; i < BLK_RING_SIZE; i++) {
+			/* Not in use? */
+			if (!copy[i].request)
+				continue;
 
-		/*
-		 * Get the bios in the request so we can re-queue them.
-		 */
-		if (copy[i].request->cmd_flags &
-		    (REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
 			/*
-			 * Flush operations don't contain bios, so
-			 * we need to requeue the whole request
+			 * Get the bios in the request so we can re-queue them.
 			 */
-			list_add(&copy[i].request->queuelist, &requests);
-			continue;
+			if (copy[i].request->cmd_flags &
+					(REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
+				/*
+				 * Flush operations don't contain bios, so
+				 * we need to requeue the whole request
+				 */
+				list_add(&copy[i].request->queuelist, &requests);
+				continue;
+			}
+			merge_bio.head = copy[i].request->bio;
+			merge_bio.tail = copy[i].request->biotail;
+			bio_list_merge(&bio_list, &merge_bio);
+			copy[i].request->bio = NULL;
+			blk_put_request(copy[i].request);
 		}
-		merge_bio.head = copy[i].request->bio;
-		merge_bio.tail = copy[i].request->biotail;
-		bio_list_merge(&bio_list, &merge_bio);
-		copy[i].request->bio = NULL;
-		blk_put_request(copy[i].request);
-	}
 
-	kfree(copy);
+		kfree(copy);
+	}
 
 	xenbus_switch_state(info->xbdev, XenbusStateConnected);
 
 	/* Now safe for us to use the shared ring */
 	info->connected = BLKIF_STATE_CONNECTED;
 
-	/* Kick any other new requests queued since we resumed */
-	kick_pending_request_queues(rinfo);
+	for (rindex = 0; rindex < info->nr_rings; rindex++) {
+		rinfo = &info->rinfo[rindex];
+		/* Kick any other new requests queued since we resumed */
+		kick_pending_request_queues(rinfo);
+	}
 
 	list_for_each_entry_safe(req, n, &requests, queuelist) {
 		/* Requeue pending requests (flush or discard) */
@@ -1685,11 +1732,10 @@ static void blkfront_setup_discard(struct blkfront_info *info)
 		info->feature_secdiscard = !!discard_secure;
 }
 
-static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo)
+static int blkfront_gather_indirect(struct blkfront_info *info)
 {
 	unsigned int indirect_segments, segs;
-	int err, i;
-	struct blkfront_info *info = rinfo->info;
+	int err;
 
 	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
 			    "feature-max-indirect-segments", "%u", &indirect_segments,
@@ -1702,6 +1748,13 @@ static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo)
 						  xen_blkif_max_segments);
 		segs = info->max_indirect_segments;
 	}
+	return segs;
+}
+
+static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo, unsigned int segs)
+{
+	int err, i;
+	struct blkfront_info *info = rinfo->info;
 
 	err = fill_grant_buffer(rinfo, (segs + INDIRECT_GREFS(segs)) * BLK_RING_SIZE);
 	if (err)
@@ -1774,9 +1827,9 @@ static void blkfront_connect(struct blkfront_info *info)
 	unsigned long sector_size;
 	unsigned int physical_sector_size;
 	unsigned int binfo;
-	int err;
+	int err, i;
 	int barrier, flush, discard, persistent;
-	struct blkfront_ring_info *rinfo = &info->rinfo;
+	struct blkfront_ring_info *rinfo;
 
 	switch (info->connected) {
 	case BLKIF_STATE_CONNECTED:
@@ -1874,11 +1927,15 @@ static void blkfront_connect(struct blkfront_info *info)
 	else
 		info->feature_persistent = persistent;
 
-	err = blkfront_setup_indirect(rinfo);
-	if (err) {
-		xenbus_dev_fatal(info->xbdev, err, "setup_indirect at %s",
-				 info->xbdev->otherend);
-		return;
+	for (i = 0; i < info->nr_rings; i++) {
+		rinfo = &info->rinfo[i];
+		err = blkfront_setup_indirect(rinfo, blkfront_gather_indirect(info));
+		if (err) {
+			xenbus_dev_fatal(info->xbdev, err, "setup_indirect at %s",
+					info->xbdev->otherend);
+			blkif_free(info, 0);
+			return;
+		}
 	}
 
 	err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size,
@@ -1893,7 +1950,10 @@ static void blkfront_connect(struct blkfront_info *info)
 
 	/* Kick pending requests. */
 	info->connected = BLKIF_STATE_CONNECTED;
-	kick_pending_request_queues(rinfo);
+	for (i = 0; i < info->nr_rings; i++) {
+		rinfo = &info->rinfo[i];
+		kick_pending_request_queues(rinfo);
+	}
 
 	add_disk(info->gd);
 
-- 
1.8.3.1

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