[Patch v3 4/4] RDMA/mana_ib : Query adapter capabilities

[sharmaajay@linuxonhyperv.com]

From: Ajay Sharma <sharmaajay@microsoft.com>

Query the adapter capabilities to expose to
other clients and VF. This checks against
the user supplied values and protects against
overflows.

Signed-off-by: Ajay Sharma <sharmaajay@microsoft.com>
---
 drivers/infiniband/hw/mana/device.c  |  4 ++
 drivers/infiniband/hw/mana/main.c    | 66 +++++++++++++++++++++++++---
 drivers/infiniband/hw/mana/mana_ib.h | 53 +++++++++++++++++++++-
 3 files changed, 115 insertions(+), 8 deletions(-)

diff --git a/drivers/infiniband/hw/mana/device.c b/drivers/infiniband/hw/mana/device.c
index 4077e440657a..e15da43c73a0 100644
--- a/drivers/infiniband/hw/mana/device.c
+++ b/drivers/infiniband/hw/mana/device.c
@@ -97,6 +97,10 @@ static int mana_ib_probe(struct auxiliary_device *adev,
 		goto free_error_eq;
 	}
 
+	ret = mana_ib_query_adapter_caps(mib_dev);
+	if (ret)
+		ibdev_dbg(&mib_dev->ib_dev, "Failed to get caps, use defaults");
+
 	ret = ib_register_device(&mib_dev->ib_dev, "mana_%d",
 				 mdev->gdma_context->dev);
 	if (ret)
diff --git a/drivers/infiniband/hw/mana/main.c b/drivers/infiniband/hw/mana/main.c
index 1b1a8670d0fa..512815e1e64d 100644
--- a/drivers/infiniband/hw/mana/main.c
+++ b/drivers/infiniband/hw/mana/main.c
@@ -469,21 +469,27 @@ int mana_ib_get_port_immutable(struct ib_device *ibdev, u32 port_num,
 int mana_ib_query_device(struct ib_device *ibdev, struct ib_device_attr *props,
 			 struct ib_udata *uhw)
 {
+	struct mana_ib_dev *mib_dev = container_of(ibdev,
+			struct mana_ib_dev, ib_dev);
+
 	props->max_qp = MANA_MAX_NUM_QUEUES;
 	props->max_qp_wr = MAX_SEND_BUFFERS_PER_QUEUE;
-
-	/*
-	 * max_cqe could be potentially much bigger.
-	 * As this version of driver only support RAW QP, set it to the same
-	 * value as max_qp_wr
-	 */
 	props->max_cqe = MAX_SEND_BUFFERS_PER_QUEUE;
-
 	props->max_mr_size = MANA_IB_MAX_MR_SIZE;
 	props->max_mr = MANA_IB_MAX_MR;
 	props->max_send_sge = MAX_TX_WQE_SGL_ENTRIES;
 	props->max_recv_sge = MAX_RX_WQE_SGL_ENTRIES;
 
+	/* If the Management SW is updated and supports adapter creation */
+	if (mib_dev->adapter_handle) {
+		props->max_qp = mib_dev->adapter_caps.max_qp_count;
+		props->max_qp_wr = mib_dev->adapter_caps.max_requester_sq_size;
+		props->max_cqe = mib_dev->adapter_caps.max_requester_sq_size;
+		props->max_mr = mib_dev->adapter_caps.max_mr_count;
+		props->max_send_sge = mib_dev->adapter_caps.max_send_wqe_size;
+		props->max_recv_sge = mib_dev->adapter_caps.max_recv_wqe_size;
+	}
+
 	return 0;
 }
 
@@ -599,3 +605,49 @@ int mana_ib_create_error_eq(struct mana_ib_dev *mib_dev)
 
 	return 0;
 }
+
+static void assign_caps(struct mana_ib_adapter_caps *caps,
+			struct mana_ib_query_adapter_caps_resp *resp)
+{
+	caps->max_sq_id = resp->max_sq_id;
+	caps->max_rq_id = resp->max_rq_id;
+	caps->max_cq_id = resp->max_cq_id;
+	caps->max_qp_count = resp->max_qp_count;
+	caps->max_cq_count = resp->max_cq_count;
+	caps->max_mr_count = resp->max_mr_count;
+	caps->max_pd_count = resp->max_pd_count;
+	caps->max_inbound_read_limit = resp->max_inbound_read_limit;
+	caps->max_outbound_read_limit = resp->max_outbound_read_limit;
+	caps->mw_count = resp->mw_count;
+	caps->max_srq_count = resp->max_srq_count;
+	caps->max_requester_sq_size = resp->max_requester_sq_size;
+	caps->max_responder_sq_size = resp->max_responder_sq_size;
+	caps->max_requester_rq_size = resp->max_requester_rq_size;
+	caps->max_responder_rq_size = resp->max_responder_rq_size;
+	caps->max_send_wqe_size = resp->max_send_wqe_size;
+	caps->max_recv_wqe_size = resp->max_recv_wqe_size;
+	caps->max_inline_data_size = resp->max_inline_data_size;
+}
+
+int mana_ib_query_adapter_caps(struct mana_ib_dev *mib_dev)
+{
+	struct mana_ib_query_adapter_caps_resp resp = {};
+	struct mana_ib_query_adapter_caps_req req = {};
+	int err;
+
+	mana_gd_init_req_hdr(&req.hdr, MANA_IB_GET_ADAPTER_CAP, sizeof(req),
+			     sizeof(resp));
+	req.hdr.resp.msg_version = MANA_IB__GET_ADAPTER_CAP_RESPONSE_V3;
+	req.hdr.dev_id = mib_dev->gc->mana_ib.dev_id;
+
+	err = mana_gd_send_request(mib_dev->gc, sizeof(req), &req,
+				   sizeof(resp), &resp);
+
+	if (err) {
+		ibdev_err(&mib_dev->ib_dev, "Failed to query adapter caps err %d", err);
+		return err;
+	}
+
+	assign_caps(&mib_dev->adapter_caps, &resp);
+	return 0;
+}
diff --git a/drivers/infiniband/hw/mana/mana_ib.h b/drivers/infiniband/hw/mana/mana_ib.h
index 8a652bccd978..1044358230d3 100644
--- a/drivers/infiniband/hw/mana/mana_ib.h
+++ b/drivers/infiniband/hw/mana/mana_ib.h
@@ -20,19 +20,41 @@
 
 /* MANA doesn't have any limit for MR size */
 #define MANA_IB_MAX_MR_SIZE	U64_MAX
-
+#define MANA_IB__GET_ADAPTER_CAP_RESPONSE_V3 3
 /*
  * The hardware limit of number of MRs is greater than maximum number of MRs
  * that can possibly represent in 24 bits
  */
 #define MANA_IB_MAX_MR		0xFFFFFFu
 
+struct mana_ib_adapter_caps {
+	u32 max_sq_id;
+	u32 max_rq_id;
+	u32 max_cq_id;
+	u32 max_qp_count;
+	u32 max_cq_count;
+	u32 max_mr_count;
+	u32 max_pd_count;
+	u32 max_inbound_read_limit;
+	u32 max_outbound_read_limit;
+	u32 mw_count;
+	u32 max_srq_count;
+	u32 max_requester_sq_size;
+	u32 max_responder_sq_size;
+	u32 max_requester_rq_size;
+	u32 max_responder_rq_size;
+	u32 max_send_wqe_size;
+	u32 max_recv_wqe_size;
+	u32 max_inline_data_size;
+};
+
 struct mana_ib_dev {
 	struct ib_device ib_dev;
 	struct gdma_dev *gdma_dev;
 	struct gdma_context *gc;
 	struct gdma_queue *fatal_err_eq;
 	mana_handle_t adapter_handle;
+	struct mana_ib_adapter_caps adapter_caps;
 };
 
 struct mana_ib_wq {
@@ -96,6 +118,7 @@ struct mana_ib_rwq_ind_table {
 };
 
 enum mana_ib_command_code {
+	MANA_IB_GET_ADAPTER_CAP = 0x30001,
 	MANA_IB_CREATE_ADAPTER  = 0x30002,
 	MANA_IB_DESTROY_ADAPTER = 0x30003,
 };
@@ -120,6 +143,32 @@ struct mana_ib_destroy_adapter_resp {
 	struct gdma_resp_hdr hdr;
 }; /* HW Data */
 
+struct mana_ib_query_adapter_caps_req {
+	struct gdma_req_hdr hdr;
+}; /*HW Data */
+
+struct mana_ib_query_adapter_caps_resp {
+	struct gdma_resp_hdr hdr;
+	u32 max_sq_id;
+	u32 max_rq_id;
+	u32 max_cq_id;
+	u32 max_qp_count;
+	u32 max_cq_count;
+	u32 max_mr_count;
+	u32 max_pd_count;
+	u32 max_inbound_read_limit;
+	u32 max_outbound_read_limit;
+	u32 mw_count;
+	u32 max_srq_count;
+	u32 max_requester_sq_size;
+	u32 max_responder_sq_size;
+	u32 max_requester_rq_size;
+	u32 max_responder_rq_size;
+	u32 max_send_wqe_size;
+	u32 max_recv_wqe_size;
+	u32 max_inline_data_size;
+}; /* HW Data */
+
 int mana_ib_gd_create_dma_region(struct mana_ib_dev *mib_dev,
 				 struct ib_umem *umem,
 				 mana_handle_t *gdma_region);
@@ -194,4 +243,6 @@ int mana_ib_create_adapter(struct mana_ib_dev *mib_dev);
 
 int mana_ib_destroy_adapter(struct mana_ib_dev *mib_dev);
 
+int mana_ib_query_adapter_caps(struct mana_ib_dev *mib_dev);
+
 #endif
-- 
2.25.1