RDMA/mana_ib: Introduce helpers to create and destroy mana queues

Intoduce helpers to work with mana ib queues (struct mana_ib_queue).
A queue always consists of umem, gdma_region, and id.
A queue can become a WQ or a CQ.
Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Link: https://lore.kernel.org/r/1711483688-24358-2-git-send-email-kotaranov@linux.microsoft.comReviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/mana/main.c

@@ -237,6 +237,49 @@ void mana_ib_dealloc_ucontext(struct ib_ucontext *ibcontext)
 		ibdev_dbg(ibdev, "Failed to destroy doorbell page %d\n", ret);
 }
 
+int mana_ib_create_queue(struct mana_ib_dev *mdev, u64 addr, u32 size,
+			 struct mana_ib_queue *queue)
+{
+	struct ib_umem *umem;
+	int err;
+
+	queue->umem = NULL;
+	queue->id = INVALID_QUEUE_ID;
+	queue->gdma_region = GDMA_INVALID_DMA_REGION;
+
+	umem = ib_umem_get(&mdev->ib_dev, addr, size, IB_ACCESS_LOCAL_WRITE);
+	if (IS_ERR(umem)) {
+		err = PTR_ERR(umem);
+		ibdev_dbg(&mdev->ib_dev, "Failed to get umem, %d\n", err);
+		return err;
+	}
+
+	err = mana_ib_create_zero_offset_dma_region(mdev, umem, &queue->gdma_region);
+	if (err) {
+		ibdev_dbg(&mdev->ib_dev, "Failed to create dma region, %d\n", err);
+		goto free_umem;
+	}
+	queue->umem = umem;
+
+	ibdev_dbg(&mdev->ib_dev,
+		  "create_dma_region ret %d gdma_region 0x%llx\n",
+		  err, queue->gdma_region);
+
+	return 0;
+free_umem:
+	ib_umem_release(umem);
+	return err;
+}
+
+void mana_ib_destroy_queue(struct mana_ib_dev *mdev, struct mana_ib_queue *queue)
+{
+	/* Ignore return code as there is not much we can do about it.
+	 * The error message is printed inside.
+	 */
+	mana_ib_gd_destroy_dma_region(mdev, queue->gdma_region);
+	ib_umem_release(queue->umem);
+}
+
 static int
 mana_ib_gd_first_dma_region(struct mana_ib_dev *dev,
 			    struct gdma_context *gc,

drivers/infiniband/hw/mana/mana_ib.h

@@ -45,6 +45,12 @@ struct mana_ib_adapter_caps {
 	u32 max_inline_data_size;
 };
 
+struct mana_ib_queue {
+	struct ib_umem *umem;
+	u64 gdma_region;
+	u64 id;
+};
+
 struct mana_ib_dev {
 	struct ib_device ib_dev;
 	struct gdma_dev *gdma_dev;
@@ -169,6 +175,10 @@ int mana_ib_create_dma_region(struct mana_ib_dev *dev, struct ib_umem *umem,
 int mana_ib_gd_destroy_dma_region(struct mana_ib_dev *dev,
 				  mana_handle_t gdma_region);
 
+int mana_ib_create_queue(struct mana_ib_dev *mdev, u64 addr, u32 size,
+			 struct mana_ib_queue *queue);
+void mana_ib_destroy_queue(struct mana_ib_dev *mdev, struct mana_ib_queue *queue);
+
 struct ib_wq *mana_ib_create_wq(struct ib_pd *pd,
 				struct ib_wq_init_attr *init_attr,
 				struct ib_udata *udata);