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Message-Id: <84d7f188e892b5b0ba251a4601455d7a137075f3.1694592708.git.jacky_gam_2001@163.com>
Date: Wed, 13 Sep 2023 16:36:42 +0800
From: Ping Gan <jacky_gam_2001@....com>
To: kbusch@...nel.org, axboe@...nel.dk, hch@....de, sagi@...mberg.me,
kch@...dia.com, linux-kernel@...r.kernel.org,
linux-nvme@...ts.infradead.org
Cc: ping_gan@...l.com, jacky_gam_2001@....com
Subject: [PATCH 2/4] nvmet: Add polling queue task for nvme target
The polling queue task of nvme target will fetch bio
requests from the lossless ring which is filled by
io-cmd-bdev's rw , then submit the requests to nvme's
polling queue, at last do polling to check the coplemented
status of the requests and complete the request.
Signed-off-by: Ping Gan <jacky_gam_2001@....com>
---
drivers/nvme/target/Makefile | 2 +-
drivers/nvme/target/nvmet.h | 13 +
drivers/nvme/target/polling-queue-thread.c | 594 +++++++++++++++++++++
3 files changed, 608 insertions(+), 1 deletion(-)
create mode 100644 drivers/nvme/target/polling-queue-thread.c
diff --git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile
index c66820102493..99272881b63e 100644
--- a/drivers/nvme/target/Makefile
+++ b/drivers/nvme/target/Makefile
@@ -10,7 +10,7 @@ obj-$(CONFIG_NVME_TARGET_FCLOOP) += nvme-fcloop.o
obj-$(CONFIG_NVME_TARGET_TCP) += nvmet-tcp.o
nvmet-y += core.o configfs.o admin-cmd.o fabrics-cmd.o \
- discovery.o io-cmd-file.o io-cmd-bdev.o
+ discovery.o io-cmd-file.o io-cmd-bdev.o polling-queue-thread.o
nvmet-$(CONFIG_NVME_TARGET_PASSTHRU) += passthru.o
nvmet-$(CONFIG_BLK_DEV_ZONED) += zns.o
nvmet-$(CONFIG_NVME_TARGET_AUTH) += fabrics-cmd-auth.o auth.o
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 8cfd60f3b564..b29a45bbdf99 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -395,6 +395,12 @@ struct nvmet_req {
u64 error_slba;
};
+struct nvmet_pqt_bio_req {
+ struct nvmet_req *req;
+ struct bio_list blist;
+ unsigned short io_completed;
+};
+
#define NVMET_MAX_MPOOL_BVEC 16
extern struct kmem_cache *nvmet_bvec_cache;
extern struct workqueue_struct *buffered_io_wq;
@@ -455,6 +461,13 @@ u16 nvmet_parse_discovery_cmd(struct nvmet_req *req);
u16 nvmet_parse_fabrics_admin_cmd(struct nvmet_req *req);
u16 nvmet_parse_fabrics_io_cmd(struct nvmet_req *req);
+//below is for enabling nvmet polling queue task
+int nvmet_init_pq_thread(u32 thread_idle, int affinity_cpu, u32 ring_size);
+void nvmet_exit_pq_thread(void);
+bool nvmet_pqt_enabled(void);
+int nvmet_pqt_ring_enqueue(void *pt);
+void nvmet_wakeup_pq_thread(void);
+
bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops);
void nvmet_req_uninit(struct nvmet_req *req);
diff --git a/drivers/nvme/target/polling-queue-thread.c b/drivers/nvme/target/polling-queue-thread.c
new file mode 100644
index 000000000000..2eb107393df9
--- /dev/null
+++ b/drivers/nvme/target/polling-queue-thread.c
@@ -0,0 +1,594 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NVMe over Fabrics target POLLING queue thread implementation.
+ * Copyright (c) 2023 Ping Gan.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/syscalls.h>
+#include <linux/compat.h>
+#include <linux/refcount.h>
+#include <linux/bits.h>
+#include <linux/blk-mq.h>
+#include <linux/kthread.h>
+
+#include <linux/sched/signal.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/fdtable.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/percpu.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/bvec.h>
+#include <linux/bio.h>
+#include <linux/net.h>
+#include <linux/wait.h>
+#include "nvmet.h"
+
+
+struct nvmet_pqt_sqe {
+ struct bio *bio;
+ struct nvmet_pqt_bio_req *pqt_req;
+ struct list_head list;
+};
+
+enum {
+ NVMET_PQ_THREAD_SHOULD_STOP = 0,
+ NVMET_PQ_THREAD_ENABLE = 1,
+};
+
+struct nvmet_pq_ring_headtail {
+ u32 head ____cacheline_aligned_in_smp;
+ u32 tail ____cacheline_aligned_in_smp;
+};
+
+struct nvmet_pq_ring {
+ struct nvmet_pq_ring_headtail prod, cons;
+ u32 size;
+ u32 mask;
+ u32 capacity;
+ struct bio_list *qe_arry[] ____cacheline_aligned_in_smp;
+};
+
+struct nvmet_pq_thread_data {
+ struct wait_queue_head wait_head;
+ struct nvmet_pq_ring *ring;
+ u32 ring_mem_size;
+ struct list_head submit_list;
+ u32 thread_idle;
+ int affinity_cpu;
+ unsigned long state;
+ pid_t task_pid;
+ pid_t task_tgid;
+ struct task_struct *thread;
+ struct mutex lock;
+ struct delayed_work compl_bio;
+};
+
+struct nvmet_pq_thread_data nvmet_pqt_data;
+
+static inline int
+nvmet_pq_powerof2_enabled(u32 n)
+{
+ return n && !(n & (n - 1));
+}
+
+static inline u32 nvmet_pq_alignpow2(u32 x)
+{
+ x--;
+ x |= x >> 1;
+ x |= x >> 2;
+ x |= x >> 4;
+ x |= x >> 8;
+ x |= x >> 16;
+ return x + 1;
+}
+
+static void nvmet_pq_mem_free(void *ptr, size_t size)
+{
+ struct page *page;
+
+ if (!ptr)
+ return;
+
+ page = virt_to_page(ptr);
+ __free_pages(page, get_order(size));
+}
+
+static void *nvmet_pq_mem_alloc(size_t size)
+{
+ gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN;
+ if (get_order(size) > MAX_ORDER)
+ return NULL;
+ return (void *) __get_free_pages(gfp_flags, get_order(size));
+}
+
+static struct nvmet_pq_ring *nvmet_create_pq_ring(u32 cnt)
+{
+ struct nvmet_pq_ring *pq_ring;
+ u32 ring_size = 0, qe_size = cnt;
+
+ if (!nvmet_pq_powerof2_enabled(cnt))
+ qe_size = nvmet_pq_alignpow2(cnt + 1);
+ ring_size += sizeof(struct nvmet_pq_ring);
+ ring_size += qe_size * sizeof(void **);
+ pq_ring = nvmet_pq_mem_alloc(ring_size);
+ if (likely(pq_ring)) {
+ pq_ring->cons.head = 0;
+ pq_ring->cons.tail = 0;
+ pq_ring->prod.head = 0;
+ pq_ring->prod.tail = 0;
+ pq_ring->size = qe_size;
+ pq_ring->mask = qe_size - 1;
+ pq_ring->capacity = nvmet_pq_powerof2_enabled(cnt)?cnt:(qe_size - 1);
+ }
+ return pq_ring;
+}
+
+//below is derived from FreeBSD's bufring.h
+/* the actual enqueue of pointers on the ring.
+ * Placed here since identical code needed in both
+ * single and multi producer enqueue functions */
+#define ENQUEUE_PTRS(r, ring_start, prod_head, obj_table, n, obj_type) do { \
+ unsigned int i; \
+ const u32 size = (r)->size; \
+ u32 idx = prod_head & (r)->mask; \
+ obj_type *ring = (obj_type *)ring_start; \
+ if (likely(idx + n < size)) { \
+ for (i = 0; i < (n & ((~(unsigned)0x3))); i += 4, idx += 4) { \
+ ring[idx] = obj_table[i]; \
+ ring[idx+1] = obj_table[i+1]; \
+ ring[idx+2] = obj_table[i+2]; \
+ ring[idx+3] = obj_table[i+3]; \
+ } \
+ switch (n & 0x3) { \
+ case 3: \
+ ring[idx++] = obj_table[i++]; /* fallthrough */ \
+ case 2: \
+ ring[idx++] = obj_table[i++]; /* fallthrough */ \
+ case 1: \
+ ring[idx++] = obj_table[i++]; \
+ } \
+ } else { \
+ for (i = 0; idx < size; i++, idx++)\
+ ring[idx] = obj_table[i]; \
+ for (idx = 0; i < n; i++, idx++) \
+ ring[idx] = obj_table[i]; \
+ } \
+} while (0)
+
+/* the actual copy of pointers on the ring to obj_table.
+ * Placed here since identical code needed in both
+ * single and multi consumer dequeue functions */
+#define DEQUEUE_PTRS(r, ring_start, cons_head, obj_table, n, obj_type) do { \
+ unsigned int i; \
+ u32 idx = cons_head & (r)->mask; \
+ const u32 size = (r)->size; \
+ obj_type *ring = (obj_type *)ring_start; \
+ if (likely(idx + n < size)) { \
+ for (i = 0; i < (n & (~(unsigned)0x3)); i += 4, idx += 4) {\
+ obj_table[i] = ring[idx]; \
+ obj_table[i+1] = ring[idx+1]; \
+ obj_table[i+2] = ring[idx+2]; \
+ obj_table[i+3] = ring[idx+3]; \
+ } \
+ switch (n & 0x3) { \
+ case 3: \
+ obj_table[i++] = ring[idx++]; /* fallthrough */ \
+ case 2: \
+ obj_table[i++] = ring[idx++]; /* fallthrough */ \
+ case 1: \
+ obj_table[i++] = ring[idx++]; \
+ } \
+ } else { \
+ for (i = 0; idx < size; i++, idx++) \
+ obj_table[i] = ring[idx]; \
+ for (idx = 0; i < n; i++, idx++) \
+ obj_table[i] = ring[idx]; \
+ } \
+} while (0)
+
+static inline u32
+__nvmet_pq_ring_move_prod_head(struct nvmet_pq_ring *r, u32 n,
+ u32 *old_head, u32 *new_head, u32 *free_entries)
+{
+ const u32 capacity = smp_load_acquire(&r->capacity);
+ u32 ret, success;
+
+ do {
+ *old_head = smp_load_acquire(&r->prod.head);
+
+ /* add rmb barrier to avoid load/load reorder in weak
+ * memory model.
+ */
+ smp_rmb();
+
+ *free_entries = (capacity + smp_load_acquire(&r->cons.tail) - *old_head);
+
+ /* check that we have enough room in ring */
+ if (unlikely(n > *free_entries))
+ return 0;
+
+ *new_head = *old_head + n;
+ ret = cmpxchg(&r->prod.head, *old_head, *new_head);
+ success = (ret == *old_head) ? 1 : 0;
+ } while (unlikely(success == 0));
+ return n;
+}
+
+static inline u32
+__nvmet_pq_ring_move_cons_head(struct nvmet_pq_ring *r, u32 n,
+ u32 *old_head, u32 *new_head, u32 *entries)
+{
+ unsigned int ret, success;
+
+ /* move cons.head atomically */
+ do {
+ *old_head = smp_load_acquire(&r->cons.head);
+
+ /* add rmb barrier to avoid load/load reorder in weak
+ * memory model.
+ */
+ smp_rmb();
+
+ *entries = (smp_load_acquire(&r->prod.tail) - *old_head);
+
+ /* check if we have enough entry to dequeue */
+ if (n > *entries)
+ return 0;
+
+ *new_head = *old_head + n;
+ ret = cmpxchg(&r->cons.head, *old_head, *new_head);
+ success = (ret == *old_head) ? 1 : 0;
+ } while (unlikely(success == 0));
+ return n;
+}
+
+static inline void
+__nvmet_pq_ring_update_tail(struct nvmet_pq_ring_headtail *ht,
+ u32 old_val, u32 new_val, u32 enqueue)
+{
+ if (enqueue)
+ smp_wmb();
+ else
+ smp_rmb();
+
+ while (unlikely(smp_load_acquire(&ht->tail) != old_val))
+ ;
+
+ smp_store_release(&ht->tail, new_val);
+}
+
+static inline u32
+__nvmet_pq_ring_do_enqueue(struct nvmet_pq_ring *r,
+ void **obj_table, u32 n, u32 *free_space)
+{
+ uint32_t prod_head, prod_next;
+ uint32_t free_entries;
+
+ n = __nvmet_pq_ring_move_prod_head(r, n, &prod_head,
+ &prod_next, &free_entries);
+ if (n == 0)
+ goto end;
+
+ ENQUEUE_PTRS(r, &r[1], prod_head, obj_table, n, void *);
+
+ __nvmet_pq_ring_update_tail(&r->prod, prod_head, prod_next, 1);
+end:
+ if (free_space != NULL)
+ *free_space = free_entries - n;
+ return n;
+}
+
+static inline u32
+__nvmet_pq_ring_do_dequeue(struct nvmet_pq_ring *r,
+ void **obj_table, u32 n, u32 *available)
+{
+ uint32_t cons_head, cons_next;
+ uint32_t entries;
+
+ n = __nvmet_pq_ring_move_cons_head(r, n, &cons_head, &cons_next, &entries);
+ if (n == 0)
+ goto end;
+
+ DEQUEUE_PTRS(r, &r[1], cons_head, obj_table, n, void *);
+
+ __nvmet_pq_ring_update_tail(&r->cons, cons_head, cons_next, 0);
+
+end:
+ if (available != NULL)
+ *available = entries - n;
+ return n;
+}
+
+static inline u32
+nvmet_pq_ring_enqueue_bulk(struct nvmet_pq_ring *r,
+ void **obj_table, u32 n, u32 *free_space)
+{
+ return __nvmet_pq_ring_do_enqueue(r, obj_table, n, free_space);
+}
+
+static inline int
+nvmet_pq_ring_enqueue(struct nvmet_pq_ring *r, void **obj)
+{
+ return nvmet_pq_ring_enqueue_bulk(r, obj, 1, NULL) ? 0 : -ENOBUFS;
+}
+
+static inline u32
+nvmet_pq_ring_dequeue_bulk(struct nvmet_pq_ring *r,
+ void **obj_table, u32 n, u32 *available)
+{
+ return __nvmet_pq_ring_do_dequeue(r, obj_table, n, available);
+}
+
+static inline int
+nvmet_pq_ring_dequeue(struct nvmet_pq_ring *r, void **obj_p)
+{
+ return nvmet_pq_ring_dequeue_bulk(r, obj_p, 1, NULL) ? 0 : -ENOENT;
+}
+
+static inline u32
+__nvmet_pq_ring_count(const struct nvmet_pq_ring *r)
+{
+ u32 prod_tail = smp_load_acquire(&r->prod.tail);
+ u32 cons_tail = smp_load_acquire(&r->cons.tail);
+ u32 count = (prod_tail - cons_tail) & r->mask;
+ u32 capacity = smp_load_acquire(&r->capacity);
+ return (count > capacity) ? capacity : count;
+}
+
+/**
+ * Return the number of free entries in a ring.
+ */
+static inline u32
+__nvmet_pq_ring_free_count(const struct nvmet_pq_ring *r)
+{
+ return smp_load_acquire(&r->capacity) - __nvmet_pq_ring_count(r);
+}
+
+/**
+ * Test if a ring is full.
+ */
+static inline int
+__nvmet_pq_ring_full(const struct nvmet_pq_ring *r)
+{
+ return __nvmet_pq_ring_free_count(r) == 0;
+}
+
+/**
+ * Test if a ring is empty.
+ */
+static inline int
+__nvmet_pq_ring_empty(const struct nvmet_pq_ring *r)
+{
+ return __nvmet_pq_ring_count(r) == 0;
+}
+
+/**
+ * Return the size of the ring.
+ */
+static inline u32
+__nvmet_pq_ring_get_size(const struct nvmet_pq_ring *r)
+{
+ return smp_load_acquire(&r->size);
+}
+
+/**
+ * Return the number of elements which can be stored in the ring.
+ */
+static inline u32
+__nvmet_pq_ring_get_capacity(const struct nvmet_pq_ring *r)
+{
+ return smp_load_acquire(&r->capacity);
+}
+
+#define NVMET_PQT_IO_BUDGET 64
+
+static inline void
+__nvmet_pqt_submit_bio(struct nvmet_pq_thread_data *pqtd,
+ struct nvmet_pqt_bio_req *pqt_req, bool cancel_thread)
+{
+ struct bio *bio;
+ struct nvmet_pqt_sqe *sqe;
+
+ while ((bio = bio_list_pop(&pqt_req->blist))) {
+ if (cancel_thread) {
+ nvmet_req_bio_put(pqt_req->req, bio);
+ if (!bio_flagged(bio, BIO_CHAIN)) {
+ kfree(pqt_req);
+ break;
+ }
+ } else {
+ if (bio_flagged(bio, BIO_CHAIN))
+ submit_bio(bio);
+ else {
+ sqe = kmalloc(sizeof(struct nvmet_pqt_sqe), GFP_KERNEL);
+ if (!sqe) {
+ bio_io_error(bio);
+ kfree(pqt_req);
+ } else {
+ sqe->bio = bio;
+ sqe->pqt_req = pqt_req;
+ submit_bio(bio);
+ list_add(&sqe->list, &pqtd->submit_list);
+ }
+ }
+ }
+ }
+}
+
+static int __nvmet_pq_thread(struct nvmet_pq_thread_data *pqtd,
+ bool cancel_thread)
+{
+ int ret = 0, poll_cnt = 0;
+ struct nvmet_pqt_bio_req *req_done;
+ struct nvmet_pqt_sqe *sqe, *tmp;
+ unsigned int poll_flags = BLK_POLL_ONESHOT;
+ DEFINE_IO_COMP_BATCH(iob);
+
+ while (1) {
+ ret = nvmet_pq_ring_dequeue(pqtd->ring, (void **)&req_done);
+ if (ret)
+ break;
+ __nvmet_pqt_submit_bio(pqtd, req_done, cancel_thread);
+ poll_cnt++;
+ if (poll_cnt == NVMET_PQT_IO_BUDGET && !cancel_thread)
+ break;
+ }
+ if (!list_empty(&pqtd->submit_list)) {
+cancel_thread_poll_again:
+ list_for_each_entry_safe(sqe, tmp, &pqtd->submit_list, list) {
+ if (sqe->pqt_req->io_completed == 1) {
+ list_del(&sqe->list);
+ kfree(sqe->pqt_req);
+ kfree(sqe);
+ continue;
+ }
+ ret = bio_poll(sqe->bio, &iob, poll_flags);
+ if (ret < 0) {
+ if (!cancel_thread) {
+ if (!rq_list_empty(iob.req_list))
+ iob.complete(&iob);
+ return 1;
+ }
+ }
+ if (ret > 0 && sqe->pqt_req->io_completed == 1) {
+ list_del(&sqe->list);
+ kfree(sqe->pqt_req);
+ kfree(sqe);
+ }
+ }
+ }
+ if (cancel_thread) {
+ if (!list_empty(&pqtd->submit_list))
+ goto cancel_thread_poll_again;
+ nvmet_pq_mem_free(pqtd->ring, pqtd->ring_mem_size);
+ }
+ if (!rq_list_empty(iob.req_list))
+ iob.complete(&iob);
+ return 0;
+}
+
+void nvmet_wakeup_pq_thread(void)
+{
+ smp_mb();
+ if (waitqueue_active(&nvmet_pqt_data.wait_head))
+ wake_up(&nvmet_pqt_data.wait_head);
+}
+
+int nvmet_pqt_ring_enqueue(void *pt)
+{
+ struct nvmet_pqt_bio_req *pqt_req = pt;
+ return nvmet_pq_ring_enqueue(nvmet_pqt_data.ring, (void **)&pqt_req);
+}
+
+static int nvmet_pq_thread(void *data)
+{
+ struct nvmet_pq_thread_data *pqtd = data;
+ unsigned long timeout = 0;
+ DEFINE_WAIT(wait);
+
+ if (pqtd->affinity_cpu != -1)
+ set_cpus_allowed_ptr(current, cpumask_of(pqtd->affinity_cpu));
+ else
+ set_cpus_allowed_ptr(current, cpu_online_mask);
+ current->flags |= PF_NO_SETAFFINITY;
+ mutex_lock(&pqtd->lock);
+ pqtd->task_pid = current->pid;
+ pqtd->task_tgid = current->tgid;
+
+ while (!kthread_should_stop()) {
+ if (test_bit(NVMET_PQ_THREAD_SHOULD_STOP, &pqtd->state))
+ break;
+
+ int ret = __nvmet_pq_thread(pqtd, false);
+ if (ret > 0 || !time_after(jiffies, timeout)) {
+ cond_resched();
+ if (ret > 0)
+ timeout = jiffies + pqtd->thread_idle;
+ continue;
+ }
+ prepare_to_wait(&pqtd->wait_head, &wait, TASK_INTERRUPTIBLE);
+ mutex_unlock(&pqtd->lock);
+ schedule();
+ mutex_lock(&pqtd->lock);
+ finish_wait(&pqtd->wait_head, &wait);
+ timeout = jiffies + pqtd->thread_idle;
+ }
+ pqtd->thread = NULL;
+ pqtd->task_pid = -1;
+ pqtd->task_tgid = -1;
+ mutex_unlock(&pqtd->lock);
+ kthread_complete_and_exit(NULL, 0);
+}
+
+bool nvmet_pqt_enabled(void)
+{
+ if (!test_bit(NVMET_PQ_THREAD_SHOULD_STOP, &nvmet_pqt_data.state) &&
+ test_bit(NVMET_PQ_THREAD_ENABLE, &nvmet_pqt_data.state))
+ return true;
+ else
+ return false;
+}
+
+static void nvmet_pqt_compl_bio_req_func(struct work_struct *work)
+{
+ struct nvmet_pq_thread_data *pqtd = container_of(work,
+ struct nvmet_pq_thread_data, compl_bio.work);
+ __nvmet_pq_thread(pqtd, true);
+}
+
+int nvmet_init_pq_thread(u32 thread_idle, int affinity_cpu, u32 ring_size)
+{
+ struct task_struct *task;
+ int ret = 0;
+
+ memset(&nvmet_pqt_data, 0, sizeof(struct nvmet_pq_thread_data));
+ init_waitqueue_head(&nvmet_pqt_data.wait_head);
+ mutex_init(&nvmet_pqt_data.lock);
+ nvmet_pqt_data.thread_idle = usecs_to_jiffies(thread_idle);
+ nvmet_pqt_data.affinity_cpu = affinity_cpu;
+ INIT_LIST_HEAD(&nvmet_pqt_data.submit_list);
+ nvmet_pqt_data.ring = nvmet_create_pq_ring(ring_size);
+ if (!nvmet_pqt_data.ring) {
+ printk(KERN_ERR "allocate poll ring failure\n");
+ return -1;
+ }
+ nvmet_pqt_data.ring_mem_size = sizeof(struct nvmet_pq_ring);
+ nvmet_pqt_data.ring_mem_size += nvmet_pqt_data.ring->size * sizeof(void **);
+ task = kthread_create(nvmet_pq_thread, (void *)&nvmet_pqt_data, "nvmet-pqt");
+ if (IS_ERR(task)) {
+ ret = PTR_ERR(task);
+ goto err;
+ }
+
+ set_user_nice(task, -20);
+ mutex_lock(&nvmet_pqt_data.lock);
+ nvmet_pqt_data.thread = task;
+ mutex_unlock(&nvmet_pqt_data.lock);
+ wake_up_process(task);
+ set_bit(NVMET_PQ_THREAD_ENABLE, &nvmet_pqt_data.state);
+ return 0;
+err:
+ nvmet_pq_mem_free(nvmet_pqt_data.ring, nvmet_pqt_data.ring_mem_size);
+ return ret;
+}
+
+void nvmet_exit_pq_thread(void)
+{
+ set_bit(NVMET_PQ_THREAD_SHOULD_STOP, &nvmet_pqt_data.state);
+ clear_bit(NVMET_PQ_THREAD_ENABLE, &nvmet_pqt_data.state);
+ mutex_lock(&nvmet_pqt_data.lock);
+ if (nvmet_pqt_data.thread) {
+ mutex_unlock(&nvmet_pqt_data.lock);
+ kthread_stop(nvmet_pqt_data.thread);
+ } else {
+ mutex_unlock(&nvmet_pqt_data.lock);
+ }
+ INIT_DELAYED_WORK(&nvmet_pqt_data.compl_bio, nvmet_pqt_compl_bio_req_func);
+ schedule_delayed_work(&nvmet_pqt_data.compl_bio, 3);
+}
--
2.26.2
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