From 9eaaab5333d6e6c53d9732f2f2cbed446a4338d9 Mon Sep 17 00:00:00 2001
From: Davide Rossetti <davide.rossetti@gmail.com>
Date: Tue, 17 Jan 2017 08:17:28 -0800
Subject: [PATCH] when creating CQ dbrec, route to peer creation and
 registration functions

fixes #5
---
 src/mlx5.h  |  2 ++
 src/verbs.c | 44 +++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/src/mlx5.h b/src/mlx5.h
index 4d1a8cd..dce7a1c 100644
--- a/src/mlx5.h
+++ b/src/mlx5.h
@@ -637,6 +637,8 @@ struct mlx5_cq {
 	struct mlx5_buf				peer_buf;
 	struct mlx5_peek_entry		      **peer_peek_table;
 	struct mlx5_peek_entry		       *peer_peek_free;
+	struct ibv_exp_peer_buf                *peer_dbrec_buf;
+	uint64_t                                peer_dbrec_id;
 };
 
 struct mlx5_srq {
diff --git a/src/verbs.c b/src/verbs.c
index 485d176..37f3e47 100644
--- a/src/verbs.c
+++ b/src/verbs.c
@@ -820,12 +820,37 @@ static struct ibv_cq *create_cq(struct ibv_context *context,
 		goto err_buf;
 	}
 
-	cq->dbrec  = mlx5_alloc_dbrec(mctx);
+	if (cq->peer_enabled && cq->peer_ctx->buf_alloc) {
+		struct ibv_exp_peer_buf_alloc_attr attr;
+
+		attr.length = mctx->cache_line_size;
+		attr.peer_id = cq->peer_ctx->peer_id;
+		attr.dir = IBV_EXP_PEER_DIRECTION_FROM_PEER |
+			IBV_EXP_PEER_DIRECTION_TO_HCA;
+		attr.alignment = mctx->cache_line_size;
+		cq->peer_dbrec_buf = cq->peer_ctx->buf_alloc(&attr);
+		if (cq->peer_dbrec_buf)
+			cq->dbrec = cq->peer_dbrec_buf->addr;
+	}
+	if (!cq->dbrec)
+		cq->dbrec = mlx5_alloc_dbrec(mctx);
 	if (!cq->dbrec) {
 		mlx5_dbg(fp, MLX5_DBG_CQ, "\n");
 		goto err_peer_buf;
 	}
 
+	if (cq->peer_enabled && cq->peer_ctx->register_va) {
+		cq->peer_dbrec_id =
+			cq->peer_ctx->register_va((void*)cq->dbrec,
+						  mctx->cache_line_size,
+						  cq->peer_ctx->peer_id,
+						  cq->peer_dbrec_buf);
+		if (!cq->peer_dbrec_id) {
+			mlx5_dbg(fp, MLX5_DBG_QP, "\n");
+			goto err_peer_buf;
+		}
+	}
+
 	cq->dbrec[MLX5_CQ_SET_CI]	= 0;
 	cq->dbrec[MLX5_CQ_ARM_DB]	= 0;
 	cq->arm_sn			= 0;
@@ -903,8 +928,14 @@ static struct ibv_cq *create_cq(struct ibv_context *context,
 	mlx5_free_db(mctx, cq->dbrec);
 
 err_peer_buf:
-	if (cq->peer_enabled)
+	if (cq->peer_enabled) {
 		mlx5_free_actual_buf(mctx, &cq->peer_buf);
+		if (cq->peer_dbrec_buf) {
+			if (cq->peer_dbrec_id)
+				cq->peer_ctx->unregister_va(cq->peer_dbrec_id, cq->peer_ctx->peer_id);
+			cq->peer_ctx->buf_release(cq->peer_dbrec_buf);
+		}
+	}
 
 err_buf:
 	mlx5_free_actual_buf(mctx, &cq->buf_a);
@@ -1027,8 +1058,15 @@ int mlx5_destroy_cq(struct ibv_cq *ibcq)
 
 	mlx5_free_db(ctx, cq->dbrec);
 	mlx5_free_actual_buf(ctx, cq->active_buf);
-	if (cq->peer_enabled)
+	if (cq->peer_enabled) {
 		mlx5_free_actual_buf(ctx, &cq->peer_buf);
+		if (cq->peer_dbrec_buf) {
+			if (cq->peer_dbrec_id)
+				cq->peer_ctx->unregister_va(cq->peer_dbrec_id, cq->peer_ctx->peer_id);
+			cq->peer_ctx->buf_release(cq->peer_dbrec_buf);
+		}
+	}
+
 	free(cq);
 
 	return 0;