[PATCH libmlx5 V1 1/2] Add CQ ignore overrun creation flag

[Leon Romanovsky <leon-2ukJVAZIZ/Y@public.gmane.org>]

From: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

In cross-channel mode, the send/receive queues will forward their
completions to managing QP. It can cause to overrun errors in
managed send/receive queues.

This patch adds ability to provide CQ flags for ibv_create_cq_ex calls
and new flag to disable CQ overrun checks.

Signed-off-by: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
 src/mlx5-abi.h | 14 ++++++++++++++
 src/verbs.c    | 57 ++++++++++++++++++++++++++++++++++++++++++---------------
 2 files changed, 56 insertions(+), 15 deletions(-)

diff --git a/src/mlx5-abi.h b/src/mlx5-abi.h
index 769ea811d26b..85f6ee3f691e 100644
--- a/src/mlx5-abi.h
+++ b/src/mlx5-abi.h
@@ -91,6 +91,20 @@ struct mlx5_create_cq_resp {
 	__u32				cqn;
 };
 
+struct mlx5_create_cq_ex {
+	struct ibv_create_cq_ex		ibv_cmd;
+	__u64				buf_addr;
+	__u64				db_addr;
+	__u32				cqe_size;
+	__u32				comp_mask;
+};
+
+struct mlx5_create_cq_resp_ex {
+	struct ibv_create_cq_resp_ex	ibv_resp;
+	__u32				cqn;
+	__u32				comp_mask;
+};
+
 struct mlx5_create_srq {
 	struct ibv_create_srq		ibv_cmd;
 	__u64				buf_addr;
diff --git a/src/verbs.c b/src/verbs.c
index 94b4d8f2424f..064a500b0a06 100644
--- a/src/verbs.c
+++ b/src/verbs.c
@@ -250,17 +250,26 @@ enum {
 };
 
 enum {
-	CREATE_CQ_SUPPORTED_FLAGS = IBV_CREATE_CQ_ATTR_COMPLETION_TIMESTAMP
+	CREATE_CQ_SUPPORTED_FLAGS = IBV_CREATE_CQ_ATTR_COMPLETION_TIMESTAMP |
+		IBV_CREATE_CQ_ATTR_IGNORE_OVERRUN
+};
+
+enum mlx5_cmd_type {
+	MLX5_LEGACY_CMD,
+	MLX5_EXTENDED_CMD
 };
 
 static struct ibv_cq *create_cq(struct ibv_context *context,
-				const struct ibv_create_cq_attr_ex *cq_attr)
+				struct ibv_create_cq_attr_ex *cq_attr,
+				enum mlx5_cmd_type ctype)
 {
 	struct mlx5_create_cq		cmd;
+	struct mlx5_create_cq_ex	cmd_ex;
 	struct mlx5_create_cq_resp	resp;
+	struct mlx5_create_cq_resp_ex	resp_ex;
 	struct mlx5_cq		       *cq;
 	int				cqe_sz;
-	int				ret;
+	int				ret = -1;
 	int				ncqe;
 #ifdef MLX5_DEBUG
 	FILE *fp = to_mctx(context)->dbg_fp;
@@ -299,7 +308,6 @@ static struct ibv_cq *create_cq(struct ibv_context *context,
 		return NULL;
 	}
 
-	memset(&cmd, 0, sizeof cmd);
 	cq->cons_index = 0;
 
 	if (mlx5_spinlock_init(&cq->lock))
@@ -342,22 +350,41 @@ static struct ibv_cq *create_cq(struct ibv_context *context,
 	cq->arm_sn			= 0;
 	cq->cqe_sz			= cqe_sz;
 
-	cmd.buf_addr = (uintptr_t) cq->buf_a.buf;
-	cmd.db_addr  = (uintptr_t) cq->dbrec;
-	cmd.cqe_size = cqe_sz;
+	if (ctype == MLX5_LEGACY_CMD) {
+		memset(&cmd, 0, sizeof(cmd));
+		cmd.buf_addr = (uintptr_t) cq->buf_a.buf;
+		cmd.db_addr  = (uintptr_t) cq->dbrec;
+		cmd.cqe_size = cqe_sz;
+
+		ret = ibv_cmd_create_cq(context, ncqe - 1, cq_attr->channel,
+					cq_attr->comp_vector,
+					&cq->ibv_cq, &cmd.ibv_cmd, sizeof cmd,
+					&resp.ibv_resp, sizeof resp);
+		cq->cqn = resp.cqn;
+
+	}
+	else if (ctype == MLX5_EXTENDED_CMD) {
+		memset(&cmd_ex, 0, sizeof(cmd_ex));
+		cmd_ex.buf_addr = (uintptr_t) cq->buf_a.buf;
+		cmd_ex.db_addr  = (uintptr_t) cq->dbrec;
+		cmd_ex.cqe_size = cqe_sz;
+
+		ret = ibv_cmd_create_cq_ex(context, cq_attr,
+					&cq->ibv_cq, &cmd_ex.ibv_cmd,
+					sizeof(cmd_ex.ibv_cmd), sizeof(cmd_ex),
+					&resp_ex.ibv_resp,
+					sizeof(resp_ex.ibv_resp), sizeof(resp_ex));
+		cq->cqn = resp_ex.cqn;
+	}
 
-	ret = ibv_cmd_create_cq(context, ncqe - 1, cq_attr->channel,
-				cq_attr->comp_vector,
-				&cq->ibv_cq, &cmd.ibv_cmd, sizeof cmd,
-				&resp.ibv_resp, sizeof resp);
 	if (ret) {
-		mlx5_dbg(fp, MLX5_DBG_CQ, "ret %d\n", ret);
+		mlx5_dbg(fp, MLX5_DBG_CQ, "ret %d, ctype = %d\n", ret, ctype);
 		goto err_db;
 	}
 
 	cq->active_buf = &cq->buf_a;
 	cq->resize_buf = NULL;
-	cq->cqn = resp.cqn;
+
 	cq->stall_enable = to_mctx(context)->stall_enable;
 	cq->stall_adaptive_enable = to_mctx(context)->stall_adaptive_enable;
 	cq->stall_cycles = to_mctx(context)->stall_cycles;
@@ -390,13 +417,13 @@ struct ibv_cq *mlx5_create_cq(struct ibv_context *context, int cqe,
 						.comp_vector = comp_vector,
 						.wc_flags = IBV_WC_STANDARD_FLAGS};
 
-	return create_cq(context, &cq_attr);
+	return create_cq(context, &cq_attr, MLX5_LEGACY_CMD);
 }
 
 struct ibv_cq *mlx5_create_cq_ex(struct ibv_context *context,
 				 struct ibv_create_cq_attr_ex *cq_attr)
 {
-	return create_cq(context, cq_attr);
+	return create_cq(context, cq_attr, MLX5_EXTENDED_CMD);
 }
 
 int mlx5_resize_cq(struct ibv_cq *ibcq, int cqe)
-- 
1.7.12.4

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