Merge tag 'for-5.7/drivers-2020-03-29' of git://git.kernel.dk/linux-block

Pull block driver updates from Jens Axboe:

 - floppy driver cleanup series from Willy

 - NVMe updates and fixes (Various)

 - null_blk trace improvements (Chaitanya)

 - bcache fixes (Coly)

 - md fixes (via Song)

 - loop block size change optimizations (Martijn)

 - scnprintf() use (Takashi)

* tag 'for-5.7/drivers-2020-03-29' of git://git.kernel.dk/linux-block: (81 commits)
  null_blk: add trace in null_blk_zoned.c
  null_blk: add tracepoint helpers for zoned mode
  block: add a zone condition debug helper
  nvme: cleanup namespace identifier reporting in nvme_init_ns_head
  nvme: rename __nvme_find_ns_head to nvme_find_ns_head
  nvme: refactor nvme_identify_ns_descs error handling
  nvme-tcp: Add warning on state change failure at nvme_tcp_setup_ctrl
  nvme-rdma: Add warning on state change failure at nvme_rdma_setup_ctrl
  nvme: Fix controller creation races with teardown flow
  nvme: Make nvme_uninit_ctrl symmetric to nvme_init_ctrl
  nvme: Fix ctrl use-after-free during sysfs deletion
  nvme-pci: Re-order nvme_pci_free_ctrl
  nvme: Remove unused return code from nvme_delete_ctrl_sync
  nvme: Use nvme_state_terminal helper
  nvme: release ida resources
  nvme: Add compat_ioctl handler for NVME_IOCTL_SUBMIT_IO
  nvmet-tcp: optimize tcp stack TX when data digest is used
  nvme-fabrics: Use scnprintf() for avoiding potential buffer overflow
  nvme-multipath: do not reset on unknown status
  nvmet-rdma: allocate RW ctxs according to mdts
  ...

16 files changed, 533 insertions, 235 deletions

diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
index b9358db83e96..9c17ed32be64 100644
--- a/drivers/nvme/host/Kconfig
+++ b/drivers/nvme/host/Kconfig
@@ -32,8 +32,6 @@ config NVME_HWMON
 	  a hardware monitoring device will be created for each NVMe drive
 	  in the system.
 
-	  If unsure, say N.
-
 config NVME_FABRICS
 	tristate
 
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 41ad07f6a564..4f907e3beda1 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -171,7 +171,6 @@ static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl)
 	nvme_remove_namespaces(ctrl);
 	ctrl->ops->delete_ctrl(ctrl);
 	nvme_uninit_ctrl(ctrl);
-	nvme_put_ctrl(ctrl);
 }
 
 static void nvme_delete_ctrl_work(struct work_struct *work)
@@ -192,21 +191,16 @@ int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
 }
 EXPORT_SYMBOL_GPL(nvme_delete_ctrl);
 
-static int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
+static void nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
 {
-	int ret = 0;
-
 	/*
 	 * Keep a reference until nvme_do_delete_ctrl() complete,
 	 * since ->delete_ctrl can free the controller.
 	 */
 	nvme_get_ctrl(ctrl);
-	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
-		ret = -EBUSY;
-	if (!ret)
+	if (nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
 		nvme_do_delete_ctrl(ctrl);
 	nvme_put_ctrl(ctrl);
-	return ret;
 }
 
 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
@@ -291,11 +285,8 @@ void nvme_complete_rq(struct request *req)
 		nvme_req(req)->ctrl->comp_seen = true;
 
 	if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
-		if ((req->cmd_flags & REQ_NVME_MPATH) &&
-		    blk_path_error(status)) {
-			nvme_failover_req(req);
+		if ((req->cmd_flags & REQ_NVME_MPATH) && nvme_failover_req(req))
 			return;
-		}
 
 		if (!blk_queue_dying(req->q)) {
 			nvme_retry_req(req);
@@ -1055,6 +1046,43 @@ static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
 	return error;
 }
 
+static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
+		struct nvme_ns_id_desc *cur)
+{
+	const char *warn_str = "ctrl returned bogus length:";
+	void *data = cur;
+
+	switch (cur->nidt) {
+	case NVME_NIDT_EUI64:
+		if (cur->nidl != NVME_NIDT_EUI64_LEN) {
+			dev_warn(ctrl->device, "%s %d for NVME_NIDT_EUI64\n",
+				 warn_str, cur->nidl);
+			return -1;
+		}
+		memcpy(ids->eui64, data + sizeof(*cur), NVME_NIDT_EUI64_LEN);
+		return NVME_NIDT_EUI64_LEN;
+	case NVME_NIDT_NGUID:
+		if (cur->nidl != NVME_NIDT_NGUID_LEN) {
+			dev_warn(ctrl->device, "%s %d for NVME_NIDT_NGUID\n",
+				 warn_str, cur->nidl);
+			return -1;
+		}
+		memcpy(ids->nguid, data + sizeof(*cur), NVME_NIDT_NGUID_LEN);
+		return NVME_NIDT_NGUID_LEN;
+	case NVME_NIDT_UUID:
+		if (cur->nidl != NVME_NIDT_UUID_LEN) {
+			dev_warn(ctrl->device, "%s %d for NVME_NIDT_UUID\n",
+				 warn_str, cur->nidl);
+			return -1;
+		}
+		uuid_copy(&ids->uuid, data + sizeof(*cur));
+		return NVME_NIDT_UUID_LEN;
+	default:
+		/* Skip unknown types */
+		return cur->nidl;
+	}
+}
+
 static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
 		struct nvme_ns_ids *ids)
 {
@@ -1074,8 +1102,17 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
 
 	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
 				      NVME_IDENTIFY_DATA_SIZE);
-	if (status)
+	if (status) {
+		dev_warn(ctrl->device,
+			"Identify Descriptors failed (%d)\n", status);
+		 /*
+		  * Don't treat an error as fatal, as we potentially already
+		  * have a NGUID or EUI-64.
+		  */
+		if (status > 0)
+			status = 0;
 		goto free_data;
+	}
 
 	for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
 		struct nvme_ns_id_desc *cur = data + pos;
@@ -1083,42 +1120,9 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
 		if (cur->nidl == 0)
 			break;
 
-		switch (cur->nidt) {
-		case NVME_NIDT_EUI64:
-			if (cur->nidl != NVME_NIDT_EUI64_LEN) {
-				dev_warn(ctrl->device,
-					 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
-					 cur->nidl);
-				goto free_data;
-			}
-			len = NVME_NIDT_EUI64_LEN;
-			memcpy(ids->eui64, data + pos + sizeof(*cur), len);
-			break;
-		case NVME_NIDT_NGUID:
-			if (cur->nidl != NVME_NIDT_NGUID_LEN) {
-				dev_warn(ctrl->device,
-					 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
-					 cur->nidl);
-				goto free_data;
-			}
-			len = NVME_NIDT_NGUID_LEN;
-			memcpy(ids->nguid, data + pos + sizeof(*cur), len);
-			break;
-		case NVME_NIDT_UUID:
-			if (cur->nidl != NVME_NIDT_UUID_LEN) {
-				dev_warn(ctrl->device,
-					 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
-					 cur->nidl);
-				goto free_data;
-			}
-			len = NVME_NIDT_UUID_LEN;
-			uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
-			break;
-		default:
-			/* Skip unknown types */
-			len = cur->nidl;
-			break;
-		}
+		len = nvme_process_ns_desc(ctrl, ids, cur);
+		if (len < 0)
+			goto free_data;
 
 		len += sizeof(*cur);
 	}
@@ -1584,6 +1588,47 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+struct nvme_user_io32 {
+	__u8	opcode;
+	__u8	flags;
+	__u16	control;
+	__u16	nblocks;
+	__u16	rsvd;
+	__u64	metadata;
+	__u64	addr;
+	__u64	slba;
+	__u32	dsmgmt;
+	__u32	reftag;
+	__u16	apptag;
+	__u16	appmask;
+} __attribute__((__packed__));
+
+#define NVME_IOCTL_SUBMIT_IO32	_IOW('N', 0x42, struct nvme_user_io32)
+
+static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
+		unsigned int cmd, unsigned long arg)
+{
+	/*
+	 * Corresponds to the difference of NVME_IOCTL_SUBMIT_IO
+	 * between 32 bit programs and 64 bit kernel.
+	 * The cause is that the results of sizeof(struct nvme_user_io),
+	 * which is used to define NVME_IOCTL_SUBMIT_IO,
+	 * are not same between 32 bit compiler and 64 bit compiler.
+	 * NVME_IOCTL_SUBMIT_IO32 is for 64 bit kernel handling
+	 * NVME_IOCTL_SUBMIT_IO issued from 32 bit programs.
+	 * Other IOCTL numbers are same between 32 bit and 64 bit.
+	 * So there is nothing to do regarding to other IOCTL numbers.
+	 */
+	if (cmd == NVME_IOCTL_SUBMIT_IO32)
+		return nvme_ioctl(bdev, mode, NVME_IOCTL_SUBMIT_IO, arg);
+
+	return nvme_ioctl(bdev, mode, cmd, arg);
+}
+#else
+#define nvme_compat_ioctl	NULL
+#endif /* CONFIG_COMPAT */
+
 static int nvme_open(struct block_device *bdev, fmode_t mode)
 {
 	struct nvme_ns *ns = bdev->bd_disk->private_data;
@@ -1721,26 +1766,15 @@ static void nvme_config_write_zeroes(struct gendisk *disk, struct nvme_ns *ns)
 static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
 		struct nvme_id_ns *id, struct nvme_ns_ids *ids)
 {
-	int ret = 0;
-
 	memset(ids, 0, sizeof(*ids));
 
 	if (ctrl->vs >= NVME_VS(1, 1, 0))
 		memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
 	if (ctrl->vs >= NVME_VS(1, 2, 0))
 		memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
-	if (ctrl->vs >= NVME_VS(1, 3, 0)) {
-		 /* Don't treat error as fatal we potentially
-		  * already have a NGUID or EUI-64
-		  */
-		ret = nvme_identify_ns_descs(ctrl, nsid, ids);
-		if (ret)
-			dev_warn(ctrl->device,
-				 "Identify Descriptors failed (%d)\n", ret);
-		if (ret > 0)
-			ret = 0;
-	}
-	return ret;
+	if (ctrl->vs >= NVME_VS(1, 3, 0))
+		return nvme_identify_ns_descs(ctrl, nsid, ids);
+	return 0;
 }
 
 static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
@@ -2027,7 +2061,7 @@ EXPORT_SYMBOL_GPL(nvme_sec_submit);
 static const struct block_device_operations nvme_fops = {
 	.owner		= THIS_MODULE,
 	.ioctl		= nvme_ioctl,
-	.compat_ioctl	= nvme_ioctl,
+	.compat_ioctl	= nvme_compat_ioctl,
 	.open		= nvme_open,
 	.release	= nvme_release,
 	.getgeo		= nvme_getgeo,
@@ -2055,7 +2089,7 @@ const struct block_device_operations nvme_ns_head_ops = {
 	.open		= nvme_ns_head_open,
 	.release	= nvme_ns_head_release,
 	.ioctl		= nvme_ioctl,
-	.compat_ioctl	= nvme_ioctl,
+	.compat_ioctl	= nvme_compat_ioctl,
 	.getgeo		= nvme_getgeo,
 	.pr_ops		= &nvme_pr_ops,
 };
@@ -2074,13 +2108,13 @@ static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
 		if ((csts & NVME_CSTS_RDY) == bit)
 			break;
 
-		msleep(100);
+		usleep_range(1000, 2000);
 		if (fatal_signal_pending(current))
 			return -EINTR;
 		if (time_after(jiffies, timeout)) {
 			dev_err(ctrl->device,
-				"Device not ready; aborting %s\n", enabled ?
-						"initialisation" : "reset");
+				"Device not ready; aborting %s, CSTS=0x%x\n",
+				enabled ? "initialisation" : "reset", csts);
 			return -ENODEV;
 		}
 	}
@@ -2591,8 +2625,7 @@ static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
 	lockdep_assert_held(&nvme_subsystems_lock);
 
 	list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) {
-		if (tmp->state == NVME_CTRL_DELETING ||
-		    tmp->state == NVME_CTRL_DEAD)
+		if (nvme_state_terminal(tmp))
 			continue;
 
 		if (tmp->cntlid == ctrl->cntlid) {
@@ -3193,6 +3226,10 @@ static ssize_t nvme_sysfs_delete(struct device *dev,
 {
 	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
 
+	/* Can't delete non-created controllers */
+	if (!ctrl->created)
+		return -EBUSY;
+
 	if (device_remove_file_self(dev, attr))
 		nvme_delete_ctrl_sync(ctrl);
 	return count;
@@ -3242,6 +3279,26 @@ static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
 }
 static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);
 
+static ssize_t nvme_sysfs_show_hostnqn(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->opts->host->nqn);
+}
+static DEVICE_ATTR(hostnqn, S_IRUGO, nvme_sysfs_show_hostnqn, NULL);
+
+static ssize_t nvme_sysfs_show_hostid(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+	return snprintf(buf, PAGE_SIZE, "%pU\n", &ctrl->opts->host->id);
+}
+static DEVICE_ATTR(hostid, S_IRUGO, nvme_sysfs_show_hostid, NULL);
+
 static ssize_t nvme_sysfs_show_address(struct device *dev,
 					 struct device_attribute *attr,
 					 char *buf)
@@ -3267,6 +3324,8 @@ static struct attribute *nvme_dev_attrs[] = {
 	&dev_attr_numa_node.attr,
 	&dev_attr_queue_count.attr,
 	&dev_attr_sqsize.attr,
+	&dev_attr_hostnqn.attr,
+	&dev_attr_hostid.attr,
 	NULL
 };
 
@@ -3280,6 +3339,10 @@ static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
 		return 0;
 	if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
 		return 0;
+	if (a == &dev_attr_hostnqn.attr && !ctrl->opts)
+		return 0;
+	if (a == &dev_attr_hostid.attr && !ctrl->opts)
+		return 0;
 
 	return a->mode;
 }
@@ -3294,7 +3357,7 @@ static const struct attribute_group *nvme_dev_attr_groups[] = {
 	NULL,
 };
 
-static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
+static struct nvme_ns_head *nvme_find_ns_head(struct nvme_subsystem *subsys,
 		unsigned nsid)
 {
 	struct nvme_ns_head *h;
@@ -3327,7 +3390,8 @@ static int __nvme_check_ids(struct nvme_subsystem *subsys,
 }
 
 static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
-		unsigned nsid, struct nvme_id_ns *id)
+		unsigned nsid, struct nvme_id_ns *id,
+		struct nvme_ns_ids *ids)
 {
 	struct nvme_ns_head *head;
 	size_t size = sizeof(*head);
@@ -3350,12 +3414,9 @@ static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
 		goto out_ida_remove;
 	head->subsys = ctrl->subsys;
 	head->ns_id = nsid;
+	head->ids = *ids;
 	kref_init(&head->ref);
 
-	ret = nvme_report_ns_ids(ctrl, nsid, id, &head->ids);
-	if (ret)
-		goto out_cleanup_srcu;
-
 	ret = __nvme_check_ids(ctrl->subsys, head);
 	if (ret) {
 		dev_err(ctrl->device,
@@ -3390,24 +3451,23 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
 	struct nvme_ctrl *ctrl = ns->ctrl;
 	bool is_shared = id->nmic & (1 << 0);
 	struct nvme_ns_head *head = NULL;
+	struct nvme_ns_ids ids;
 	int ret = 0;
 
+	ret = nvme_report_ns_ids(ctrl, nsid, id, &ids);
+	if (ret)
+		goto out;
+
 	mutex_lock(&ctrl->subsys->lock);
 	if (is_shared)
-		head = __nvme_find_ns_head(ctrl->subsys, nsid);
+		head = nvme_find_ns_head(ctrl->subsys, nsid);
 	if (!head) {
-		head = nvme_alloc_ns_head(ctrl, nsid, id);
+		head = nvme_alloc_ns_head(ctrl, nsid, id, &ids);
 		if (IS_ERR(head)) {
 			ret = PTR_ERR(head);
 			goto out_unlock;
 		}
 	} else {
-		struct nvme_ns_ids ids;
-
-		ret = nvme_report_ns_ids(ctrl, nsid, id, &ids);
-		if (ret)
-			goto out_unlock;
-
 		if (!nvme_ns_ids_equal(&head->ids, &ids)) {
 			dev_err(ctrl->device,
 				"IDs don't match for shared namespace %d\n",
@@ -3422,6 +3482,7 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
 
 out_unlock:
 	mutex_unlock(&ctrl->subsys->lock);
+out:
 	if (ret > 0)
 		ret = blk_status_to_errno(nvme_error_status(ret));
 	return ret;
@@ -3480,7 +3541,7 @@ static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
 	return 0;
 }
 
-static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
+static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 {
 	struct nvme_ns *ns;
 	struct gendisk *disk;
@@ -3490,13 +3551,11 @@ static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 
 	ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
 	if (!ns)
-		return -ENOMEM;
+		return;
 
 	ns->queue = blk_mq_init_queue(ctrl->tagset);
-	if (IS_ERR(ns->queue)) {
-		ret = PTR_ERR(ns->queue);
+	if (IS_ERR(ns->queue))
 		goto out_free_ns;
-	}
 
 	if (ctrl->opts && ctrl->opts->data_digest)
 		ns->queue->backing_dev_info->capabilities
@@ -3519,10 +3578,8 @@ static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	if (ret)
 		goto out_free_queue;
 
-	if (id->ncap == 0) {
-		ret = -EINVAL;
+	if (id->ncap == 0)	/* no namespace (legacy quirk) */
 		goto out_free_id;
-	}
 
 	ret = nvme_init_ns_head(ns, nsid, id);
 	if (ret)
@@ -3531,10 +3588,8 @@ static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	nvme_set_disk_name(disk_name, ns, ctrl, &flags);
 
 	disk = alloc_disk_node(0, node);
-	if (!disk) {
-		ret = -ENOMEM;
+	if (!disk)
 		goto out_unlink_ns;
-	}
 
 	disk->fops = &nvme_fops;
 	disk->private_data = ns;
@@ -3565,7 +3620,7 @@ static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	nvme_fault_inject_init(&ns->fault_inject, ns->disk->disk_name);
 	kfree(id);
 
-	return 0;
+	return;
  out_put_disk:
 	put_disk(ns->disk);
  out_unlink_ns:
@@ -3579,9 +3634,6 @@ static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	blk_cleanup_queue(ns->queue);
  out_free_ns:
 	kfree(ns);
-	if (ret > 0)
-		ret = blk_status_to_errno(nvme_error_status(ret));
-	return ret;
 }
 
 static void nvme_ns_remove(struct nvme_ns *ns)
@@ -3987,6 +4039,7 @@ void nvme_start_ctrl(struct nvme_ctrl *ctrl)
 		nvme_queue_scan(ctrl);
 		nvme_start_queues(ctrl);
 	}
+	ctrl->created = true;
 }
 EXPORT_SYMBOL_GPL(nvme_start_ctrl);
 
@@ -3995,6 +4048,7 @@ void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
 	nvme_fault_inject_fini(&ctrl->fault_inject);
 	dev_pm_qos_hide_latency_tolerance(ctrl->device);
 	cdev_device_del(&ctrl->cdev, ctrl->device);
+	nvme_put_ctrl(ctrl);
 }
 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
 
@@ -4077,6 +4131,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 	if (ret)
 		goto out_release_instance;
 
+	nvme_get_ctrl(ctrl);
 	cdev_init(&ctrl->cdev, &nvme_dev_fops);
 	ctrl->cdev.owner = ops->module;
 	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
@@ -4095,6 +4150,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 
 	return 0;
 out_free_name:
+	nvme_put_ctrl(ctrl);
 	kfree_const(ctrl->device->kobj.name);
 out_release_instance:
 	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
@@ -4299,6 +4355,7 @@ static void __exit nvme_core_exit(void)
 	destroy_workqueue(nvme_delete_wq);
 	destroy_workqueue(nvme_reset_wq);
 	destroy_workqueue(nvme_wq);
+	ida_destroy(&nvme_instance_ida);
 }
 
 MODULE_LICENSE("GPL");
diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 74b8818ac9a1..2a6c8190eeb7 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -105,14 +105,14 @@ int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
 	int len = 0;
 
 	if (ctrl->opts->mask & NVMF_OPT_TRADDR)
-		len += snprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
+		len += scnprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
 	if (ctrl->opts->mask & NVMF_OPT_TRSVCID)
-		len += snprintf(buf + len, size - len, "%strsvcid=%s",
+		len += scnprintf(buf + len, size - len, "%strsvcid=%s",
 				(len) ? "," : "", ctrl->opts->trsvcid);
 	if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)
-		len += snprintf(buf + len, size - len, "%shost_traddr=%s",
+		len += scnprintf(buf + len, size - len, "%shost_traddr=%s",
 				(len) ? "," : "", ctrl->opts->host_traddr);
-	len += snprintf(buf + len, size - len, "\n");
+	len += scnprintf(buf + len, size - len, "\n");
 
 	return len;
 }
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 5a70ac395d53..a8bf2fb1287b 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3181,10 +3181,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 		goto fail_ctrl;
 	}
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	if (!queue_delayed_work(nvme_wq, &ctrl->connect_work, 0)) {
-		nvme_put_ctrl(&ctrl->ctrl);
 		dev_err(ctrl->ctrl.device,
 			"NVME-FC{%d}: failed to schedule initial connect\n",
 			ctrl->cnum);
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index a38d7f196aba..61bf87592570 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -64,17 +64,12 @@ void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 	}
 }
 
-void nvme_failover_req(struct request *req)
+bool nvme_failover_req(struct request *req)
 {
 	struct nvme_ns *ns = req->q->queuedata;
 	u16 status = nvme_req(req)->status;
 	unsigned long flags;
 
-	spin_lock_irqsave(&ns->head->requeue_lock, flags);
-	blk_steal_bios(&ns->head->requeue_list, req);
-	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);
-	blk_mq_end_request(req, 0);
-
 	switch (status & 0x7ff) {
 	case NVME_SC_ANA_TRANSITION:
 	case NVME_SC_ANA_INACCESSIBLE:
@@ -103,15 +98,17 @@ void nvme_failover_req(struct request *req)
 		nvme_mpath_clear_current_path(ns);
 		break;
 	default:
-		/*
-		 * Reset the controller for any non-ANA error as we don't know
-		 * what caused the error.
-		 */
-		nvme_reset_ctrl(ns->ctrl);
-		break;
+		/* This was a non-ANA error so follow the normal error path. */
+		return false;
 	}
 
+	spin_lock_irqsave(&ns->head->requeue_lock, flags);
+	blk_steal_bios(&ns->head->requeue_list, req);
+	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);
+	blk_mq_end_request(req, 0);
+
 	kblockd_schedule_work(&ns->head->requeue_work);
+	return true;
 }
 
 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 1024fec7914c..2e04a36296d9 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -259,6 +259,7 @@ struct nvme_ctrl {
 	struct nvme_command ka_cmd;
 	struct work_struct fw_act_work;
 	unsigned long events;
+	bool created;
 
 #ifdef CONFIG_NVME_MULTIPATH
 	/* asymmetric namespace access: */
@@ -550,7 +551,7 @@ void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 			struct nvme_ctrl *ctrl, int *flags);
-void nvme_failover_req(struct request *req);
+bool nvme_failover_req(struct request *req);
 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
@@ -599,8 +600,9 @@ static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
 }
 
-static inline void nvme_failover_req(struct request *req)
+static inline bool nvme_failover_req(struct request *req)
 {
+	return false;
 }
 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 {
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index d3f23d6254e4..4e79e412b276 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -971,39 +971,25 @@ static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, u16 idx)
 	nvme_end_request(req, cqe->status, cqe->result);
 }
 
-static void nvme_complete_cqes(struct nvme_queue *nvmeq, u16 start, u16 end)
-{
-	while (start != end) {
-		nvme_handle_cqe(nvmeq, start);
-		if (++start == nvmeq->q_depth)
-			start = 0;
-	}
-}
-
 static inline void nvme_update_cq_head(struct nvme_queue *nvmeq)
 {
-	if (nvmeq->cq_head == nvmeq->q_depth - 1) {
+	if (++nvmeq->cq_head == nvmeq->q_depth) {
 		nvmeq->cq_head = 0;
-		nvmeq->cq_phase = !nvmeq->cq_phase;
-	} else {
-		nvmeq->cq_head++;
+		nvmeq->cq_phase ^= 1;
 	}
 }
 
-static inline int nvme_process_cq(struct nvme_queue *nvmeq, u16 *start,
-				  u16 *end, unsigned int tag)
+static inline int nvme_process_cq(struct nvme_queue *nvmeq)
 {
 	int found = 0;
 
-	*start = nvmeq->cq_head;
 	while (nvme_cqe_pending(nvmeq)) {
-		if (tag == -1U || nvmeq->cqes[nvmeq->cq_head].command_id == tag)
-			found++;
+		found++;
+		nvme_handle_cqe(nvmeq, nvmeq->cq_head);
 		nvme_update_cq_head(nvmeq);
 	}
-	*end = nvmeq->cq_head;
 
-	if (*start != *end)
+	if (found)
 		nvme_ring_cq_doorbell(nvmeq);
 	return found;
 }
@@ -1012,21 +998,16 @@ static irqreturn_t nvme_irq(int irq, void *data)
 {
 	struct nvme_queue *nvmeq = data;
 	irqreturn_t ret = IRQ_NONE;
-	u16 start, end;
 
 	/*
 	 * The rmb/wmb pair ensures we see all updates from a previous run of
 	 * the irq handler, even if that was on another CPU.
 	 */
 	rmb();
-	nvme_process_cq(nvmeq, &start, &end, -1);
+	if (nvme_process_cq(nvmeq))
+		ret = IRQ_HANDLED;
 	wmb();
 
-	if (start != end) {
-		nvme_complete_cqes(nvmeq, start, end);
-		return IRQ_HANDLED;
-	}
-
 	return ret;
 }
 
@@ -1039,46 +1020,30 @@ static irqreturn_t nvme_irq_check(int irq, void *data)
 }
 
 /*
- * Poll for completions any queue, including those not dedicated to polling.
+ * Poll for completions for any interrupt driven queue
  * Can be called from any context.
  */
-static int nvme_poll_irqdisable(struct nvme_queue *nvmeq, unsigned int tag)
+static void nvme_poll_irqdisable(struct nvme_queue *nvmeq)
 {
 	struct pci_dev *pdev = to_pci_dev(nvmeq->dev->dev);
-	u16 start, end;
-	int found;
 
-	/*
-	 * For a poll queue we need to protect against the polling thread
-	 * using the CQ lock.  For normal interrupt driven threads we have
-	 * to disable the interrupt to avoid racing with it.
-	 */
-	if (test_bit(NVMEQ_POLLED, &nvmeq->flags)) {
-		spin_lock(&nvmeq->cq_poll_lock);
-		found = nvme_process_cq(nvmeq, &start, &end, tag);
-		spin_unlock(&nvmeq->cq_poll_lock);
-	} else {
-		disable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
-		found = nvme_process_cq(nvmeq, &start, &end, tag);
-		enable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
-	}
+	WARN_ON_ONCE(test_bit(NVMEQ_POLLED, &nvmeq->flags));
 
-	nvme_complete_cqes(nvmeq, start, end);
-	return found;
+	disable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
+	nvme_process_cq(nvmeq);
+	enable_irq(pci_irq_vector(pdev, nvmeq->cq_vector));
 }
 
 static int nvme_poll(struct blk_mq_hw_ctx *hctx)
 {
 	struct nvme_queue *nvmeq = hctx->driver_data;
-	u16 start, end;
 	bool found;
 
 	if (!nvme_cqe_pending(nvmeq))
 		return 0;
 
 	spin_lock(&nvmeq->cq_poll_lock);
-	found = nvme_process_cq(nvmeq, &start, &end, -1);
-	nvme_complete_cqes(nvmeq, start, end);
+	found = nvme_process_cq(nvmeq);
 	spin_unlock(&nvmeq->cq_poll_lock);
 
 	return found;
@@ -1255,7 +1220,12 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
 	/*
 	 * Did we miss an interrupt?
 	 */
-	if (nvme_poll_irqdisable(nvmeq, req->tag)) {
+	if (test_bit(NVMEQ_POLLED, &nvmeq->flags))
+		nvme_poll(req->mq_hctx);
+	else
+		nvme_poll_irqdisable(nvmeq);
+
+	if (blk_mq_request_completed(req)) {
 		dev_warn(dev->ctrl.device,
 			 "I/O %d QID %d timeout, completion polled\n",
 			 req->tag, nvmeq->qid);
@@ -1398,7 +1368,7 @@ static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
 	else
 		nvme_disable_ctrl(&dev->ctrl);
 
-	nvme_poll_irqdisable(nvmeq, -1);
+	nvme_poll_irqdisable(nvmeq);
 }
 
 /*
@@ -1409,13 +1379,10 @@ static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
  */
 static void nvme_reap_pending_cqes(struct nvme_dev *dev)
 {
-	u16 start, end;
 	int i;
 
-	for (i = dev->ctrl.queue_count - 1; i > 0; i--) {
-		nvme_process_cq(&dev->queues[i], &start, &end, -1);
-		nvme_complete_cqes(&dev->queues[i], start, end);
-	}
+	for (i = dev->ctrl.queue_count - 1; i > 0; i--)
+		nvme_process_cq(&dev->queues[i]);
 }
 
 static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
@@ -2503,13 +2470,13 @@ static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
 	struct nvme_dev *dev = to_nvme_dev(ctrl);
 
 	nvme_dbbuf_dma_free(dev);
-	put_device(dev->dev);
 	nvme_free_tagset(dev);
 	if (dev->ctrl.admin_q)
 		blk_put_queue(dev->ctrl.admin_q);
-	kfree(dev->queues);
 	free_opal_dev(dev->ctrl.opal_dev);
 	mempool_destroy(dev->iod_mempool);
+	put_device(dev->dev);
+	kfree(dev->queues);
 	kfree(dev);
 }
 
@@ -2689,7 +2656,7 @@ static int nvme_pci_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
 {
 	struct pci_dev *pdev = to_pci_dev(to_nvme_dev(ctrl)->dev);
 
-	return snprintf(buf, size, "%s", dev_name(&pdev->dev));
+	return snprintf(buf, size, "%s\n", dev_name(&pdev->dev));
 }
 
 static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
@@ -2835,7 +2802,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));
 
 	nvme_reset_ctrl(&dev->ctrl);
-	nvme_get_ctrl(&dev->ctrl);
 	async_schedule(nvme_async_probe, dev);
 
 	return 0;
@@ -2907,10 +2873,9 @@ static void nvme_remove(struct pci_dev *pdev)
 	nvme_free_host_mem(dev);
 	nvme_dev_remove_admin(dev);
 	nvme_free_queues(dev, 0);
-	nvme_uninit_ctrl(&dev->ctrl);
 	nvme_release_prp_pools(dev);
 	nvme_dev_unmap(dev);
-	nvme_put_ctrl(&dev->ctrl);
+	nvme_uninit_ctrl(&dev->ctrl);
 }
 
 #ifdef CONFIG_PM_SLEEP
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 0fe08c4dfd2f..86603d9b0cef 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1024,8 +1024,13 @@ static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
 
 	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
 	if (!changed) {
-		/* state change failure is ok if we're in DELETING state */
+		/*
+		 * state change failure is ok if we're in DELETING state,
+		 * unless we're during creation of a new controller to
+		 * avoid races with teardown flow.
+		 */
 		WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
+		WARN_ON_ONCE(new);
 		ret = -EINVAL;
 		goto destroy_io;
 	}
@@ -2045,8 +2050,6 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 	dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
 		ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	mutex_lock(&nvme_rdma_ctrl_mutex);
 	list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
 	mutex_unlock(&nvme_rdma_ctrl_mutex);
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 49d4373b84eb..0ef14f0fad86 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -20,6 +20,16 @@
 
 struct nvme_tcp_queue;
 
+/* Define the socket priority to use for connections were it is desirable
+ * that the NIC consider performing optimized packet processing or filtering.
+ * A non-zero value being sufficient to indicate general consideration of any
+ * possible optimization.  Making it a module param allows for alternative
+ * values that may be unique for some NIC implementations.
+ */
+static int so_priority;
+module_param(so_priority, int, 0644);
+MODULE_PARM_DESC(so_priority, "nvme tcp socket optimize priority");
+
 enum nvme_tcp_send_state {
 	NVME_TCP_SEND_CMD_PDU = 0,
 	NVME_TCP_SEND_H2C_PDU,
@@ -1017,8 +1027,15 @@ static int nvme_tcp_try_send(struct nvme_tcp_queue *queue)
 	if (req->state == NVME_TCP_SEND_DDGST)
 		ret = nvme_tcp_try_send_ddgst(req);
 done:
-	if (ret == -EAGAIN)
+	if (ret == -EAGAIN) {
 		ret = 0;
+	} else if (ret < 0) {
+		dev_err(queue->ctrl->ctrl.device,
+			"failed to send request %d\n", ret);
+		if (ret != -EPIPE && ret != -ECONNRESET)
+			nvme_tcp_fail_request(queue->request);
+		nvme_tcp_done_send_req(queue);
+	}
 	return ret;
 }
 
@@ -1049,25 +1066,16 @@ static void nvme_tcp_io_work(struct work_struct *w)
 		int result;
 
 		result = nvme_tcp_try_send(queue);
-		if (result > 0) {
+		if (result > 0)
 			pending = true;
-		} else if (unlikely(result < 0)) {
-			dev_err(queue->ctrl->ctrl.device,
-				"failed to send request %d\n", result);
-
-			/*
-			 * Fail the request unless peer closed the connection,
-			 * in which case error recovery flow will complete all.
-			 */
-			if ((result != -EPIPE) && (result != -ECONNRESET))
-				nvme_tcp_fail_request(queue->request);
-			nvme_tcp_done_send_req(queue);
-			return;
-		}
+		else if (unlikely(result < 0))
+			break;
 
 		result = nvme_tcp_try_recv(queue);
 		if (result > 0)
 			pending = true;
+		else if (unlikely(result < 0))
+			break;
 
 		if (!pending)
 			return;
@@ -1248,13 +1256,67 @@ free_icreq:
 	return ret;
 }
 
+static bool nvme_tcp_admin_queue(struct nvme_tcp_queue *queue)
+{
+	return nvme_tcp_queue_id(queue) == 0;
+}
+
+static bool nvme_tcp_default_queue(struct nvme_tcp_queue *queue)
+{
+	struct nvme_tcp_ctrl *ctrl = queue->ctrl;
+	int qid = nvme_tcp_queue_id(queue);
+
+	return !nvme_tcp_admin_queue(queue) &&
+		qid < 1 + ctrl->io_queues[HCTX_TYPE_DEFAULT];
+}
+
+static bool nvme_tcp_read_queue(struct nvme_tcp_queue *queue)
+{
+	struct nvme_tcp_ctrl *ctrl = queue->ctrl;
+	int qid = nvme_tcp_queue_id(queue);
+
+	return !nvme_tcp_admin_queue(queue) &&
+		!nvme_tcp_default_queue(queue) &&
+		qid < 1 + ctrl->io_queues[HCTX_TYPE_DEFAULT] +
+			  ctrl->io_queues[HCTX_TYPE_READ];
+}
+
+static bool nvme_tcp_poll_queue(struct nvme_tcp_queue *queue)
+{
+	struct nvme_tcp_ctrl *ctrl = queue->ctrl;
+	int qid = nvme_tcp_queue_id(queue);
+
+	return !nvme_tcp_admin_queue(queue) &&
+		!nvme_tcp_default_queue(queue) &&
+		!nvme_tcp_read_queue(queue) &&
+		qid < 1 + ctrl->io_queues[HCTX_TYPE_DEFAULT] +
+			  ctrl->io_queues[HCTX_TYPE_READ] +
+			  ctrl->io_queues[HCTX_TYPE_POLL];
+}
+
+static void nvme_tcp_set_queue_io_cpu(struct nvme_tcp_queue *queue)
+{
+	struct nvme_tcp_ctrl *ctrl = queue->ctrl;
+	int qid = nvme_tcp_queue_id(queue);
+	int n = 0;
+
+	if (nvme_tcp_default_queue(queue))
+		n = qid - 1;
+	else if (nvme_tcp_read_queue(queue))
+		n = qid - ctrl->io_queues[HCTX_TYPE_DEFAULT] - 1;
+	else if (nvme_tcp_poll_queue(queue))
+		n = qid - ctrl->io_queues[HCTX_TYPE_DEFAULT] -
+				ctrl->io_queues[HCTX_TYPE_READ] - 1;
+	queue->io_cpu = cpumask_next_wrap(n - 1, cpu_online_mask, -1, false);
+}
+
 static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
 		int qid, size_t queue_size)
 {
 	struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
 	struct nvme_tcp_queue *queue = &ctrl->queues[qid];
 	struct linger sol = { .l_onoff = 1, .l_linger = 0 };
-	int ret, opt, rcv_pdu_size, n;
+	int ret, opt, rcv_pdu_size;
 
 	queue->ctrl = ctrl;
 	INIT_LIST_HEAD(&queue->send_list);
@@ -1309,6 +1371,17 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
 		goto err_sock;
 	}
 
+	if (so_priority > 0) {
+		ret = kernel_setsockopt(queue->sock, SOL_SOCKET, SO_PRIORITY,
+				(char *)&so_priority, sizeof(so_priority));
+		if (ret) {
+			dev_err(ctrl->ctrl.device,
+				"failed to set SO_PRIORITY sock opt, ret %d\n",
+				ret);
+			goto err_sock;
+		}
+	}
+
 	/* Set socket type of service */
 	if (nctrl->opts->tos >= 0) {
 		opt = nctrl->opts->tos;
@@ -1322,11 +1395,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
 	}
 
 	queue->sock->sk->sk_allocation = GFP_ATOMIC;
-	if (!qid)
-		n = 0;
-	else
-		n = (qid - 1) % num_online_cpus();
-	queue->io_cpu = cpumask_next_wrap(n - 1, cpu_online_mask, -1, false);
+	nvme_tcp_set_queue_io_cpu(queue);
 	queue->request = NULL;
 	queue->data_remaining = 0;
 	queue->ddgst_remaining = 0;
@@ -1861,8 +1930,13 @@ static int nvme_tcp_setup_ctrl(struct nvme_ctrl *ctrl, bool new)
 	}
 
 	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_LIVE)) {
-		/* state change failure is ok if we're in DELETING state */
+		/*
+		 * state change failure is ok if we're in DELETING state,
+		 * unless we're during creation of a new controller to
+		 * avoid races with teardown flow.
+		 */
 		WARN_ON_ONCE(ctrl->state != NVME_CTRL_DELETING);
+		WARN_ON_ONCE(new);
 		ret = -EINVAL;
 		goto destroy_io;
 	}
@@ -2359,8 +2433,6 @@ static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
 	dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n",
 		ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	mutex_lock(&nvme_tcp_ctrl_mutex);
 	list_add_tail(&ctrl->list, &nvme_tcp_ctrl_list);
 	mutex_unlock(&nvme_tcp_ctrl_mutex);
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index cca759c918a4..9d6f75cfa77c 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -323,12 +323,25 @@ static void nvmet_execute_get_log_page(struct nvmet_req *req)
 	nvmet_req_complete(req, NVME_SC_INVALID_FIELD | NVME_SC_DNR);
 }
 
+static void nvmet_id_set_model_number(struct nvme_id_ctrl *id,
+				      struct nvmet_subsys *subsys)
+{
+	const char *model = NVMET_DEFAULT_CTRL_MODEL;
+	struct nvmet_subsys_model *subsys_model;
+
+	rcu_read_lock();
+	subsys_model = rcu_dereference(subsys->model);
+	if (subsys_model)
+		model = subsys_model->number;
+	memcpy_and_pad(id->mn, sizeof(id->mn), model, strlen(model), ' ');
+	rcu_read_unlock();
+}
+
 static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 {
 	struct nvmet_ctrl *ctrl = req->sq->ctrl;
 	struct nvme_id_ctrl *id;
 	u16 status = 0;
-	const char model[] = "Linux";
 
 	id = kzalloc(sizeof(*id), GFP_KERNEL);
 	if (!id) {
@@ -343,7 +356,7 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 	memset(id->sn, ' ', sizeof(id->sn));
 	bin2hex(id->sn, &ctrl->subsys->serial,
 		min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
-	memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' ');
+	nvmet_id_set_model_number(id, ctrl->subsys);
 	memcpy_and_pad(id->fr, sizeof(id->fr),
 		       UTS_RELEASE, strlen(UTS_RELEASE), ' ');
 
@@ -357,8 +370,12 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 	/* we support multiple ports, multiples hosts and ANA: */
 	id->cmic = (1 << 0) | (1 << 1) | (1 << 3);
 
-	/* no limit on data transfer sizes for now */
-	id->mdts = 0;
+	/* Limit MDTS according to transport capability */
+	if (ctrl->ops->get_mdts)
+		id->mdts = ctrl->ops->get_mdts(ctrl);
+	else
+		id->mdts = 0;
+
 	id->cntlid = cpu_to_le16(ctrl->cntlid);
 	id->ver = cpu_to_le32(ctrl->subsys->ver);
 
@@ -721,13 +738,22 @@ static void nvmet_execute_set_features(struct nvmet_req *req)
 {
 	struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 	u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
+	u32 cdw11 = le32_to_cpu(req->cmd->common.cdw11);
 	u16 status = 0;
+	u16 nsqr;
+	u16 ncqr;
 
 	if (!nvmet_check_data_len(req, 0))
 		return;
 
 	switch (cdw10 & 0xff) {
 	case NVME_FEAT_NUM_QUEUES:
+		ncqr = (cdw11 >> 16) & 0xffff;
+		nsqr = cdw11 & 0xffff;
+		if (ncqr == 0xffff || nsqr == 0xffff) {
+			status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+			break;
+		}
 		nvmet_set_result(req,
 			(subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
 		break;
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 98613a45bd3b..7aa10788b7c8 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -395,14 +395,12 @@ static ssize_t nvmet_ns_device_uuid_store(struct config_item *item,
 	struct nvmet_subsys *subsys = ns->subsys;
 	int ret = 0;
 
-
 	mutex_lock(&subsys->lock);
 	if (ns->enabled) {
 		ret = -EBUSY;
 		goto out_unlock;
 	}
 
-
 	if (uuid_parse(page, &ns->uuid))
 		ret = -EINVAL;
 
@@ -815,10 +813,10 @@ static ssize_t nvmet_subsys_attr_version_show(struct config_item *item,
 				(int)NVME_MAJOR(subsys->ver),
 				(int)NVME_MINOR(subsys->ver),
 				(int)NVME_TERTIARY(subsys->ver));
-	else
-		return snprintf(page, PAGE_SIZE, "%d.%d\n",
-				(int)NVME_MAJOR(subsys->ver),
-				(int)NVME_MINOR(subsys->ver));
+
+	return snprintf(page, PAGE_SIZE, "%d.%d\n",
+			(int)NVME_MAJOR(subsys->ver),
+			(int)NVME_MINOR(subsys->ver));
 }
 
 static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
@@ -828,7 +826,6 @@ static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
 	int major, minor, tertiary = 0;
 	int ret;
 
-
 	ret = sscanf(page, "%d.%d.%d\n", &major, &minor, &tertiary);
 	if (ret != 2 && ret != 3)
 		return -EINVAL;
@@ -852,20 +849,151 @@ static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item,
 static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item,
 					      const char *page, size_t count)
 {
-	struct nvmet_subsys *subsys = to_subsys(item);
+	u64 serial;
+
+	if (sscanf(page, "%llx\n", &serial) != 1)
+		return -EINVAL;
 
 	down_write(&nvmet_config_sem);
-	sscanf(page, "%llx\n", &subsys->serial);
+	to_subsys(item)->serial = serial;
 	up_write(&nvmet_config_sem);
 
 	return count;
 }
 CONFIGFS_ATTR(nvmet_subsys_, attr_serial);
 
+static ssize_t nvmet_subsys_attr_cntlid_min_show(struct config_item *item,
+						 char *page)
+{
+	return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_min);
+}
+
+static ssize_t nvmet_subsys_attr_cntlid_min_store(struct config_item *item,
+						  const char *page, size_t cnt)
+{
+	u16 cntlid_min;
+
+	if (sscanf(page, "%hu\n", &cntlid_min) != 1)
+		return -EINVAL;
+
+	if (cntlid_min == 0)
+		return -EINVAL;
+
+	down_write(&nvmet_config_sem);
+	if (cntlid_min >= to_subsys(item)->cntlid_max)
+		goto out_unlock;
+	to_subsys(item)->cntlid_min = cntlid_min;
+	up_write(&nvmet_config_sem);
+	return cnt;
+
+out_unlock:
+	up_write(&nvmet_config_sem);
+	return -EINVAL;
+}
+CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_min);
+
+static ssize_t nvmet_subsys_attr_cntlid_max_show(struct config_item *item,
+						 char *page)
+{
+	return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_max);
+}
+
+static ssize_t nvmet_subsys_attr_cntlid_max_store(struct config_item *item,
+						  const char *page, size_t cnt)
+{
+	u16 cntlid_max;
+
+	if (sscanf(page, "%hu\n", &cntlid_max) != 1)
+		return -EINVAL;
+
+	if (cntlid_max == 0)
+		return -EINVAL;
+
+	down_write(&nvmet_config_sem);
+	if (cntlid_max <= to_subsys(item)->cntlid_min)
+		goto out_unlock;
+	to_subsys(item)->cntlid_max = cntlid_max;
+	up_write(&nvmet_config_sem);
+	return cnt;
+
+out_unlock:
+	up_write(&nvmet_config_sem);
+	return -EINVAL;
+}
+CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_max);
+
+static ssize_t nvmet_subsys_attr_model_show(struct config_item *item,
+					    char *page)
+{
+	struct nvmet_subsys *subsys = to_subsys(item);
+	struct nvmet_subsys_model *subsys_model;
+	char *model = NVMET_DEFAULT_CTRL_MODEL;
+	int ret;
+
+	rcu_read_lock();
+	subsys_model = rcu_dereference(subsys->model);
+	if (subsys_model)
+		model = subsys_model->number;
+	ret = snprintf(page, PAGE_SIZE, "%s\n", model);
+	rcu_read_unlock();
+
+	return ret;
+}
+
+/* See Section 1.5 of NVMe 1.4 */
+static bool nvmet_is_ascii(const char c)
+{
+	return c >= 0x20 && c <= 0x7e;
+}
+
+static ssize_t nvmet_subsys_attr_model_store(struct config_item *item,
+					     const char *page, size_t count)
+{
+	struct nvmet_subsys *subsys = to_subsys(item);
+	struct nvmet_subsys_model *new_model;
+	char *new_model_number;
+	int pos = 0, len;
+
+	len = strcspn(page, "\n");
+	if (!len)
+		return -EINVAL;
+
+	for (pos = 0; pos < len; pos++) {
+		if (!nvmet_is_ascii(page[pos]))
+			return -EINVAL;
+	}
+
+	new_model_number = kstrndup(page, len, GFP_KERNEL);
+	if (!new_model_number)
+		return -ENOMEM;
+
+	new_model = kzalloc(sizeof(*new_model) + len + 1, GFP_KERNEL);
+	if (!new_model) {
+		kfree(new_model_number);
+		return -ENOMEM;
+	}
+	memcpy(new_model->number, new_model_number, len);
+
+	down_write(&nvmet_config_sem);
+	mutex_lock(&subsys->lock);
+	new_model = rcu_replace_pointer(subsys->model, new_model,
+					mutex_is_locked(&subsys->lock));
+	mutex_unlock(&subsys->lock);
+	up_write(&nvmet_config_sem);
+
+	kfree_rcu(new_model, rcuhead);
+
+	return count;
+}
+CONFIGFS_ATTR(nvmet_subsys_, attr_model);
+
 static struct configfs_attribute *nvmet_subsys_attrs[] = {
 	&nvmet_subsys_attr_attr_allow_any_host,
 	&nvmet_subsys_attr_attr_version,
 	&nvmet_subsys_attr_attr_serial,
+	&nvmet_subsys_attr_attr_cntlid_min,
+	&nvmet_subsys_attr_attr_cntlid_max,
+	&nvmet_subsys_attr_attr_model,
 	NULL,
 };
 
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 576de773b4db..b685f99d56a1 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1289,8 +1289,11 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
 	if (!ctrl->sqs)
 		goto out_free_cqs;
 
+	if (subsys->cntlid_min > subsys->cntlid_max)
+		goto out_free_cqs;
+
 	ret = ida_simple_get(&cntlid_ida,
-			     NVME_CNTLID_MIN, NVME_CNTLID_MAX,
+			     subsys->cntlid_min, subsys->cntlid_max,
 			     GFP_KERNEL);
 	if (ret < 0) {
 		status = NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
@@ -1438,7 +1441,8 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
 		kfree(subsys);
 		return ERR_PTR(-ENOMEM);
 	}
-
+	subsys->cntlid_min = NVME_CNTLID_MIN;
+	subsys->cntlid_max = NVME_CNTLID_MAX;
 	kref_init(&subsys->ref);
 
 	mutex_init(&subsys->lock);
@@ -1457,6 +1461,7 @@ static void nvmet_subsys_free(struct kref *ref)
 	WARN_ON_ONCE(!list_empty(&subsys->namespaces));
 
 	kfree(subsys->subsysnqn);
+	kfree_rcu(subsys->model, rcuhead);
 	kfree(subsys);
 }
 
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 4df4ebde208a..0d54e730cbf2 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -485,7 +485,6 @@ out_destroy_admin:
 out_disable:
 	dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
 	nvme_uninit_ctrl(&ctrl->ctrl);
-	nvme_put_ctrl(&ctrl->ctrl);
 }
 
 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
@@ -618,8 +617,6 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
 	dev_info(ctrl->ctrl.device,
 		 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
 	WARN_ON_ONCE(!changed);
 
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index eda28b22a2c8..421dff3ea143 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -23,6 +23,7 @@
 #define NVMET_ASYNC_EVENTS		4
 #define NVMET_ERROR_LOG_SLOTS		128
 #define NVMET_NO_ERROR_LOC		((u16)-1)
+#define NVMET_DEFAULT_CTRL_MODEL	"Linux"
 
 /*
  * Supported optional AENs:
@@ -202,6 +203,11 @@ struct nvmet_ctrl {
 	struct nvme_error_slot	slots[NVMET_ERROR_LOG_SLOTS];
 };
 
+struct nvmet_subsys_model {
+	struct rcu_head		rcuhead;
+	char			number[];
+};
+
 struct nvmet_subsys {
 	enum nvme_subsys_type	type;
 
@@ -211,6 +217,8 @@ struct nvmet_subsys {
 	struct list_head	namespaces;
 	unsigned int		nr_namespaces;
 	unsigned int		max_nsid;
+	u16			cntlid_min;
+	u16			cntlid_max;
 
 	struct list_head	ctrls;
 
@@ -227,6 +235,8 @@ struct nvmet_subsys {
 
 	struct config_group	namespaces_group;
 	struct config_group	allowed_hosts_group;
+
+	struct nvmet_subsys_model	__rcu *model;
 };
 
 static inline struct nvmet_subsys *to_subsys(struct config_item *item)
@@ -279,6 +289,7 @@ struct nvmet_fabrics_ops {
 			struct nvmet_port *port, char *traddr);
 	u16 (*install_queue)(struct nvmet_sq *nvme_sq);
 	void (*discovery_chg)(struct nvmet_port *port);
+	u8 (*get_mdts)(const struct nvmet_ctrl *ctrl);
 };
 
 #define NVMET_MAX_INLINE_BIOVEC	8
diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 37d262a65877..9e1b8c61f54e 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -31,6 +31,9 @@
 #define NVMET_RDMA_MAX_INLINE_SGE		4
 #define NVMET_RDMA_MAX_INLINE_DATA_SIZE		max_t(int, SZ_16K, PAGE_SIZE)
 
+/* Assume mpsmin == device_page_size == 4KB */
+#define NVMET_RDMA_MAX_MDTS			8
+
 struct nvmet_rdma_cmd {
 	struct ib_sge		sge[NVMET_RDMA_MAX_INLINE_SGE + 1];
 	struct ib_cqe		cqe;
@@ -975,7 +978,7 @@ static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
 {
 	struct ib_qp_init_attr qp_attr;
 	struct nvmet_rdma_device *ndev = queue->dev;
-	int comp_vector, nr_cqe, ret, i;
+	int comp_vector, nr_cqe, ret, i, factor;
 
 	/*
 	 * Spread the io queues across completion vectors,
@@ -1008,7 +1011,9 @@ static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
 	qp_attr.qp_type = IB_QPT_RC;
 	/* +1 for drain */
 	qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
-	qp_attr.cap.max_rdma_ctxs = queue->send_queue_size;
+	factor = rdma_rw_mr_factor(ndev->device, queue->cm_id->port_num,
+				   1 << NVMET_RDMA_MAX_MDTS);
+	qp_attr.cap.max_rdma_ctxs = queue->send_queue_size * factor;
 	qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
 					ndev->device->attrs.max_send_sge);
 
@@ -1602,6 +1607,11 @@ static void nvmet_rdma_disc_port_addr(struct nvmet_req *req,
 	}
 }
 
+static u8 nvmet_rdma_get_mdts(const struct nvmet_ctrl *ctrl)
+{
+	return NVMET_RDMA_MAX_MDTS;
+}
+
 static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
 	.owner			= THIS_MODULE,
 	.type			= NVMF_TRTYPE_RDMA,
@@ -1612,6 +1622,7 @@ static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
 	.queue_response		= nvmet_rdma_queue_response,
 	.delete_ctrl		= nvmet_rdma_delete_ctrl,
 	.disc_traddr		= nvmet_rdma_disc_port_addr,
+	.get_mdts		= nvmet_rdma_get_mdts,
 };
 
 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index 5bb5342b8d0c..f0da04e960f4 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -19,6 +19,16 @@
 
 #define NVMET_TCP_DEF_INLINE_DATA_SIZE	(4 * PAGE_SIZE)
 
+/* Define the socket priority to use for connections were it is desirable
+ * that the NIC consider performing optimized packet processing or filtering.
+ * A non-zero value being sufficient to indicate general consideration of any
+ * possible optimization.  Making it a module param allows for alternative
+ * values that may be unique for some NIC implementations.
+ */
+static int so_priority;
+module_param(so_priority, int, 0644);
+MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority");
+
 #define NVMET_TCP_RECV_BUDGET		8
 #define NVMET_TCP_SEND_BUDGET		8
 #define NVMET_TCP_IO_WORK_BUDGET	64
@@ -622,7 +632,7 @@ static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
 	return 1;
 }
 
-static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd)
+static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
 {
 	struct nvmet_tcp_queue *queue = cmd->queue;
 	struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
@@ -632,6 +642,9 @@ static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd)
 	};
 	int ret;
 
+	if (!last_in_batch && cmd->queue->send_list_len)
+		msg.msg_flags |= MSG_MORE;
+
 	ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
 	if (unlikely(ret <= 0))
 		return ret;
@@ -672,7 +685,7 @@ static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue,
 	}
 
 	if (cmd->state == NVMET_TCP_SEND_DDGST) {
-		ret = nvmet_try_send_ddgst(cmd);
+		ret = nvmet_try_send_ddgst(cmd, last_in_batch);
 		if (ret <= 0)
 			goto done_send;
 	}
@@ -794,7 +807,7 @@ static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue)
 	icresp->hdr.pdo = 0;
 	icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen);
 	icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
-	icresp->maxdata = cpu_to_le32(0xffff); /* FIXME: support r2t */
+	icresp->maxdata = cpu_to_le32(0x400000); /* 16M arbitrary limit */
 	icresp->cpda = 0;
 	if (queue->hdr_digest)
 		icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
@@ -1439,6 +1452,13 @@ static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
 	if (ret)
 		return ret;
 
+	if (so_priority > 0) {
+		ret = kernel_setsockopt(sock, SOL_SOCKET, SO_PRIORITY,
+				(char *)&so_priority, sizeof(so_priority));
+		if (ret)
+			return ret;
+	}
+
 	/* Set socket type of service */
 	if (inet->rcv_tos > 0) {
 		int tos = inet->rcv_tos;
@@ -1628,6 +1648,15 @@ static int nvmet_tcp_add_port(struct nvmet_port *nport)
 		goto err_sock;
 	}
 
+	if (so_priority > 0) {
+		ret = kernel_setsockopt(port->sock, SOL_SOCKET, SO_PRIORITY,
+				(char *)&so_priority, sizeof(so_priority));
+		if (ret) {
+			pr_err("failed to set SO_PRIORITY sock opt %d\n", ret);
+			goto err_sock;
+		}
+	}
+
 	ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
 			sizeof(port->addr));
 	if (ret) {