[PATCH 1/4] Provider/rxe: Exchange capabilities with driver

[Bob Pearson <rpearsonhpe@xxxxxxxxx>]

Exchange capability masks between provider and driver
during alloc_context verb.

Signed-off-by: Bob Pearson <rpearson@xxxxxxx>
---
 kernel-headers/rdma/rdma_user_rxe.h | 18 ++++++++++++++++++
 providers/rxe/rxe-abi.h             |  2 ++
 providers/rxe/rxe.c                 | 12 ++++++++----
 providers/rxe/rxe.h                 |  5 +++++
 4 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/kernel-headers/rdma/rdma_user_rxe.h b/kernel-headers/rdma/rdma_user_rxe.h
index d8f2e0e4..70ac031e 100644
--- a/kernel-headers/rdma/rdma_user_rxe.h
+++ b/kernel-headers/rdma/rdma_user_rxe.h
@@ -152,6 +158,18 @@ struct rxe_recv_wqe {
 	struct rxe_dma_info	dma;
 };
 
+enum rxe_capabilities {
+	RXE_CAP_NONE		= 0,
+};
+
+struct rxe_alloc_context_cmd {
+	__aligned_u64		provider_cap;
+};
+
+struct rxe_alloc_context_resp {
+	__aligned_u64		driver_cap;
+};
+
 struct rxe_create_cq_resp {
 	struct mminfo mi;
 };
diff --git a/providers/rxe/rxe-abi.h b/providers/rxe/rxe-abi.h
index b4680a24..0b0b4b38 100644
--- a/providers/rxe/rxe-abi.h
+++ b/providers/rxe/rxe-abi.h
@@ -39,6 +39,8 @@
 #include <rdma/rdma_user_rxe.h>
 #include <kernel-abi/rdma_user_rxe.h>
 
+DECLARE_DRV_CMD(urxe_alloc_context, IB_USER_VERBS_CMD_GET_CONTEXT,
+		rxe_alloc_context_cmd, rxe_alloc_context_resp);
 DECLARE_DRV_CMD(urxe_create_cq, IB_USER_VERBS_CMD_CREATE_CQ,
 		empty, rxe_create_cq_resp);
 DECLARE_DRV_CMD(urxe_create_qp, IB_USER_VERBS_CMD_CREATE_QP,
diff --git a/providers/rxe/rxe.c b/providers/rxe/rxe.c
index ca881304..c29b7de5 100644
--- a/providers/rxe/rxe.c
+++ b/providers/rxe/rxe.c
@@ -865,18 +865,22 @@ static struct verbs_context *rxe_alloc_context(struct ibv_device *ibdev,
 					       void *private_data)
 {
 	struct rxe_context *context;
-	struct ibv_get_context cmd;
-	struct ib_uverbs_get_context_resp resp;
+	struct urxe_alloc_context cmd = {};
+	struct urxe_alloc_context_resp resp = {};
 
 	context = verbs_init_and_alloc_context(ibdev, cmd_fd, context, ibv_ctx,
 					       RDMA_DRIVER_RXE);
 	if (!context)
 		return NULL;
 
-	if (ibv_cmd_get_context(&context->ibv_ctx, &cmd, sizeof(cmd),
-				&resp, sizeof(resp)))
+	cmd.provider_cap = RXE_PROVIDER_CAP;
+
+	if (ibv_cmd_get_context(&context->ibv_ctx, &cmd.ibv_cmd, sizeof(cmd),
+				&resp.ibv_resp, sizeof(resp)))
 		goto out;
 
+	context->capabilities = cmd.provider_cap & resp.driver_cap;
+
 	verbs_set_ops(&context->ibv_ctx, &rxe_ctx_ops);
 
 	return &context->ibv_ctx;
diff --git a/providers/rxe/rxe.h b/providers/rxe/rxe.h
index 96f4ee9c..736cc30e 100644
--- a/providers/rxe/rxe.h
+++ b/providers/rxe/rxe.h
@@ -48,6 +48,10 @@ enum rdma_network_type {
 	RDMA_NETWORK_IPV6
 };
 
+enum rxe_provider_cap {
+	RXE_PROVIDER_CAP	= RXE_CAP_NONE,
+};
+
 struct rxe_device {
 	struct verbs_device	ibv_dev;
 	int	abi_version;
@@ -55,6 +59,7 @@ struct rxe_device {
 
 struct rxe_context {
 	struct verbs_context	ibv_ctx;
+	uint64_t		capabilities;
 };
 
 struct rxe_cq {
-- 
2.27.0