[PATCH for-next 1/3] RDMA/erdma: Add a workqueue for WRs reflushing

[Cheng Xu <chengyou@linux.alibaba.com>]

ERDMA driver use a workqueue for asynchronous reflush command posting.
Implement the lifecycle of this workqueue.

Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
---
 drivers/infiniband/hw/erdma/erdma.h      |  1 +
 drivers/infiniband/hw/erdma/erdma_main.c | 14 ++++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/erdma/erdma.h b/drivers/infiniband/hw/erdma/erdma.h
index bb23d897c710..7bd053a1147a 100644
--- a/drivers/infiniband/hw/erdma/erdma.h
+++ b/drivers/infiniband/hw/erdma/erdma.h
@@ -190,6 +190,7 @@ struct erdma_dev {
 	struct net_device *netdev;
 	struct pci_dev *pdev;
 	struct notifier_block netdev_nb;
+	struct workqueue_struct *reflush_wq;
 
 	resource_size_t func_bar_addr;
 	resource_size_t func_bar_len;
diff --git a/drivers/infiniband/hw/erdma/erdma_main.c b/drivers/infiniband/hw/erdma/erdma_main.c
index e44b06fea595..5dc31e5df5cb 100644
--- a/drivers/infiniband/hw/erdma/erdma_main.c
+++ b/drivers/infiniband/hw/erdma/erdma_main.c
@@ -521,13 +521,22 @@ static int erdma_ib_device_add(struct pci_dev *pdev)
 
 	u64_to_ether_addr(mac, dev->attrs.peer_addr);
 
+	dev->reflush_wq = alloc_workqueue("erdma-reflush-wq", WQ_UNBOUND,
+					  WQ_UNBOUND_MAX_ACTIVE);
+	if (!dev->reflush_wq) {
+		ret = -ENOMEM;
+		goto err_alloc_workqueue;
+	}
+
 	ret = erdma_device_register(dev);
 	if (ret)
-		goto err_out;
+		goto err_register;
 
 	return 0;
 
-err_out:
+err_register:
+	destroy_workqueue(dev->reflush_wq);
+err_alloc_workqueue:
 	xa_destroy(&dev->qp_xa);
 	xa_destroy(&dev->cq_xa);
 
@@ -543,6 +552,7 @@ static void erdma_ib_device_remove(struct pci_dev *pdev)
 	unregister_netdevice_notifier(&dev->netdev_nb);
 	ib_unregister_device(&dev->ibdev);
 
+	destroy_workqueue(dev->reflush_wq);
 	erdma_res_cb_free(dev);
 	xa_destroy(&dev->qp_xa);
 	xa_destroy(&dev->cq_xa);
-- 
2.27.0