linux-kernel - [PATCH rdma-next v2 5/5] RDMA/mana_ib: implement uapi for creation of rnic cq

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Message-Id: <1714137160-5222-6-git-send-email-kotaranov@linux.microsoft.com>
Date: Fri, 26 Apr 2024 06:12:40 -0700
From: Konstantin Taranov <kotaranov@...ux.microsoft.com>
To: kotaranov@...rosoft.com,
	sharmaajay@...rosoft.com,
	longli@...rosoft.com,
	jgg@...pe.ca,
	leon@...nel.org
Cc: linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH rdma-next v2 5/5] RDMA/mana_ib: implement uapi for creation of rnic cq

From: Konstantin Taranov <kotaranov@...rosoft.com>

Enable users to create RNIC CQs using a corresponding flag.
With the previous request size, an ethernet CQ is created.
As a response, return ID of the created CQ.

Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.com>
---
 drivers/infiniband/hw/mana/cq.c | 55 ++++++++++++++++++++++++++++++---
 include/uapi/rdma/mana-abi.h    | 12 +++++++
 2 files changed, 63 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/mana/cq.c b/drivers/infiniband/hw/mana/cq.c
index 688ffe6..c6a3fd5 100644
--- a/drivers/infiniband/hw/mana/cq.c
+++ b/drivers/infiniband/hw/mana/cq.c
@@ -9,17 +9,22 @@ int mana_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 		      struct ib_udata *udata)
 {
 	struct mana_ib_cq *cq = container_of(ibcq, struct mana_ib_cq, ibcq);
+	struct mana_ib_create_cq_resp resp = {};
+	struct mana_ib_ucontext *mana_ucontext;
 	struct ib_device *ibdev = ibcq->device;
 	struct mana_ib_create_cq ucmd = {};
 	struct mana_ib_dev *mdev;
+	bool is_rnic_cq;
+	u32 doorbell;
 	int err;
 
 	mdev = container_of(ibdev, struct mana_ib_dev, ib_dev);
 
-	if (udata->inlen < sizeof(ucmd))
-		return -EINVAL;
-
 	cq->comp_vector = attr->comp_vector % ibdev->num_comp_vectors;
+	cq->cq_handle = INVALID_MANA_HANDLE;
+
+	if (udata->inlen < offsetof(struct mana_ib_create_cq, flags))
+		return -EINVAL;
 
 	err = ib_copy_from_udata(&ucmd, udata, min(sizeof(ucmd), udata->inlen));
 	if (err) {
@@ -28,7 +33,9 @@ int mana_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 		return err;
 	}
 
-	if (attr->cqe > mdev->adapter_caps.max_qp_wr) {
+	is_rnic_cq = !!(ucmd.flags & MANA_IB_CREATE_RNIC_CQ);
+
+	if (!is_rnic_cq && attr->cqe > mdev->adapter_caps.max_qp_wr) {
 		ibdev_dbg(ibdev, "CQE %d exceeding limit\n", attr->cqe);
 		return -EINVAL;
 	}
@@ -40,7 +47,41 @@ int mana_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 		return err;
 	}
 
+	mana_ucontext = rdma_udata_to_drv_context(udata, struct mana_ib_ucontext,
+						  ibucontext);
+	doorbell = mana_ucontext->doorbell;
+
+	if (is_rnic_cq) {
+		err = mana_ib_gd_create_cq(mdev, cq, doorbell);
+		if (err) {
+			ibdev_dbg(ibdev, "Failed to create RNIC cq, %d\n", err);
+			goto err_destroy_queue;
+		}
+
+		err = mana_ib_install_cq_cb(mdev, cq);
+		if (err) {
+			ibdev_dbg(ibdev, "Failed to install cq callback, %d\n", err);
+			goto err_destroy_rnic_cq;
+		}
+	}
+
+	resp.cqid = cq->queue.id;
+	err = ib_copy_to_udata(udata, &resp, min(sizeof(resp), udata->outlen));
+	if (err) {
+		ibdev_dbg(&mdev->ib_dev, "Failed to copy to udata, %d\n", err);
+		goto err_remove_cq_cb;
+	}
+
 	return 0;
+
+err_remove_cq_cb:
+	mana_ib_remove_cq_cb(mdev, cq);
+err_destroy_rnic_cq:
+	mana_ib_gd_destroy_cq(mdev, cq);
+err_destroy_queue:
+	mana_ib_destroy_queue(mdev, &cq->queue);
+
+	return err;
 }
 
 int mana_ib_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
@@ -52,6 +93,12 @@ int mana_ib_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 	mdev = container_of(ibdev, struct mana_ib_dev, ib_dev);
 
 	mana_ib_remove_cq_cb(mdev, cq);
+
+	/* Ignore return code as there is not much we can do about it.
+	 * The error message is printed inside.
+	 */
+	mana_ib_gd_destroy_cq(mdev, cq);
+
 	mana_ib_destroy_queue(mdev, &cq->queue);
 
 	return 0;
diff --git a/include/uapi/rdma/mana-abi.h b/include/uapi/rdma/mana-abi.h
index 5fcb31b..2c41cc3 100644
--- a/include/uapi/rdma/mana-abi.h
+++ b/include/uapi/rdma/mana-abi.h
@@ -16,8 +16,20 @@
 
 #define MANA_IB_UVERBS_ABI_VERSION 1
 
+enum mana_ib_create_cq_flags {
+	MANA_IB_CREATE_RNIC_CQ	= 1 << 0,
+};
+
 struct mana_ib_create_cq {
 	__aligned_u64 buf_addr;
+	__u16	flags;
+	__u16	reserved0;
+	__u32	reserved1;
+};
+
+struct mana_ib_create_cq_resp {
+	__u32 cqid;
+	__u32 reserved;
 };
 
 struct mana_ib_create_qp {
-- 
2.43.0