From a1a5d42a2c48660c040695bd8316538a9ce83ab2 Mon Sep 17 00:00:00 2001
From: Chengchang Tang <tangchengchang@huawei.com>
Date: Mon, 10 May 2021 17:13:17 +0800
Subject: [PATCH 22/25] libhns: Add support for attaching QP's WQE buffer

driver inclusion
category: feature
bugzilla: https://gitee.com/src-openeuler/rdma-core/issues/I9C2AQ

------------------------------------------------------------------

If a uQP works in DCA mode, the WQE's buffer will be split as many blocks
and be stored into a list. The blocks are allocated from the DCA's memory
pool before posting WRs and are dropped when the QP's CI is equal to PI
after polling CQ.

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
---
 providers/hns/hns_roce_u.h       |  26 ++++-
 providers/hns/hns_roce_u_buf.c   | 173 ++++++++++++++++++++++++++++++-
 providers/hns/hns_roce_u_hw_v2.c | 125 +++++++++++++++++++++-
 providers/hns/hns_roce_u_hw_v2.h |   2 +
 providers/hns/hns_roce_u_verbs.c |  32 ++++--
 5 files changed, 345 insertions(+), 13 deletions(-)

diff --git a/providers/hns/hns_roce_u.h b/providers/hns/hns_roce_u.h
index e3fa24d..ba646d3 100644
--- a/providers/hns/hns_roce_u.h
+++ b/providers/hns/hns_roce_u.h
@@ -365,11 +365,18 @@ struct hns_roce_sge_ex {
 	unsigned int			sge_shift;
 };
 
+struct hns_roce_dca_buf {
+	void **bufs;
+	unsigned int max_cnt;
+	unsigned int shift;
+};
+
 struct hns_roce_qp {
 	struct verbs_qp			verbs_qp;
 	struct hns_roce_buf		buf;
+	struct hns_roce_dca_buf		dca_wqe;
 	int				max_inline_data;
-	int				buf_size;
+	unsigned int			buf_size;
 	unsigned int			sq_signal_bits;
 	struct hns_roce_wq		sq;
 	struct hns_roce_wq		rq;
@@ -423,11 +430,22 @@ struct hns_roce_u_hw {
 	struct verbs_context_ops hw_ops;
 };
 
+struct hns_roce_dca_attach_attr {
+	uint32_t sq_offset;
+	uint32_t sge_offset;
+	uint32_t rq_offset;
+};
+
+struct hns_roce_dca_detach_attr {
+	uint32_t sq_index;
+};
+
 /*
  * The entries's buffer should be aligned to a multiple of the hardware's
  * minimum page size.
  */
 #define hr_hw_page_align(x) align(x, HNS_HW_PAGE_SIZE)
+#define hr_hw_page_count(x) (hr_hw_page_align(x) / HNS_HW_PAGE_SIZE)
 
 static inline unsigned int to_hr_hem_entries_size(int count, int buf_shift)
 {
@@ -603,9 +621,13 @@ void hns_roce_qp_spinlock_destroy(struct hns_roce_qp *qp);
 
 void hns_roce_free_qp_buf(struct hns_roce_qp *qp, struct hns_roce_context *ctx);
 
+int hns_roce_attach_dca_mem(struct hns_roce_context *ctx, uint32_t handle,
+			    struct hns_roce_dca_attach_attr *attr,
+			    uint32_t size, struct hns_roce_dca_buf *buf);
+void hns_roce_detach_dca_mem(struct hns_roce_context *ctx, uint32_t handle,
+			     struct hns_roce_dca_detach_attr *attr);
 void hns_roce_shrink_dca_mem(struct hns_roce_context *ctx);
 void hns_roce_cleanup_dca_mem(struct hns_roce_context *ctx);
-int hns_roce_add_dca_mem(struct hns_roce_context *ctx, uint32_t size);
 
 void hns_roce_init_qp_indices(struct hns_roce_qp *qp);
 
diff --git a/providers/hns/hns_roce_u_buf.c b/providers/hns/hns_roce_u_buf.c
index c0f86e9..3d41b89 100644
--- a/providers/hns/hns_roce_u_buf.c
+++ b/providers/hns/hns_roce_u_buf.c
@@ -196,6 +196,88 @@ static int shrink_dca_mem(struct hns_roce_context *ctx, uint32_t handle,
 
 	return ret;
 }
+
+struct hns_dca_mem_query_resp {
+	uint64_t key;
+	uint32_t offset;
+	uint32_t page_count;
+};
+
+static int query_dca_mem(struct hns_roce_context *ctx, uint32_t handle,
+			 uint32_t index, struct hns_dca_mem_query_resp *resp)
+{
+	int ret;
+
+	DECLARE_COMMAND_BUFFER(cmd, HNS_IB_OBJECT_DCA_MEM,
+			       HNS_IB_METHOD_DCA_MEM_QUERY, 5);
+	fill_attr_in_obj(cmd, HNS_IB_ATTR_DCA_MEM_QUERY_HANDLE, handle);
+	fill_attr_in_uint32(cmd, HNS_IB_ATTR_DCA_MEM_QUERY_PAGE_INDEX, index);
+	fill_attr_out(cmd, HNS_IB_ATTR_DCA_MEM_QUERY_OUT_KEY,
+		      &resp->key, sizeof(resp->key));
+	fill_attr_out(cmd, HNS_IB_ATTR_DCA_MEM_QUERY_OUT_OFFSET,
+		      &resp->offset, sizeof(resp->offset));
+	fill_attr_out(cmd, HNS_IB_ATTR_DCA_MEM_QUERY_OUT_PAGE_COUNT,
+		      &resp->page_count, sizeof(resp->page_count));
+	ret = execute_ioctl(&ctx->ibv_ctx.context, cmd);
+	if (ret)
+		verbs_err(&ctx->ibv_ctx,
+			  "failed to query DCA mem-%u, ret = %d.\n",
+			  handle, ret);
+
+	return ret;
+}
+
+void hns_roce_detach_dca_mem(struct hns_roce_context *ctx, uint32_t handle,
+			     struct hns_roce_dca_detach_attr *attr)
+{
+	int ret;
+
+	DECLARE_COMMAND_BUFFER(cmd, HNS_IB_OBJECT_DCA_MEM,
+			       HNS_IB_METHOD_DCA_MEM_DETACH, 4);
+	fill_attr_in_obj(cmd, HNS_IB_ATTR_DCA_MEM_DETACH_HANDLE, handle);
+	fill_attr_in_uint32(cmd, HNS_IB_ATTR_DCA_MEM_DETACH_SQ_INDEX,
+			    attr->sq_index);
+	ret = execute_ioctl(&ctx->ibv_ctx.context, cmd);
+	if (ret)
+		verbs_warn(&ctx->ibv_ctx,
+			   "failed to detach DCA mem-%u, ret = %d.\n",
+			   handle, ret);
+}
+
+struct hns_dca_mem_attach_resp {
+#define HNS_DCA_ATTACH_OUT_FLAGS_NEW_BUFFER BIT(0)
+	uint32_t alloc_flags;
+	uint32_t alloc_pages;
+};
+
+static int attach_dca_mem(struct hns_roce_context *ctx, uint32_t handle,
+			  struct hns_roce_dca_attach_attr *attr,
+			  struct hns_dca_mem_attach_resp *resp)
+{
+	int ret;
+
+	DECLARE_COMMAND_BUFFER(cmd, HNS_IB_OBJECT_DCA_MEM,
+			       HNS_IB_METHOD_DCA_MEM_ATTACH, 6);
+	fill_attr_in_obj(cmd, HNS_IB_ATTR_DCA_MEM_ATTACH_HANDLE, handle);
+	fill_attr_in_uint32(cmd, HNS_IB_ATTR_DCA_MEM_ATTACH_SQ_OFFSET,
+			    attr->sq_offset);
+	fill_attr_in_uint32(cmd, HNS_IB_ATTR_DCA_MEM_ATTACH_SGE_OFFSET,
+			    attr->sge_offset);
+	fill_attr_in_uint32(cmd, HNS_IB_ATTR_DCA_MEM_ATTACH_RQ_OFFSET,
+			    attr->rq_offset);
+	fill_attr_out(cmd, HNS_IB_ATTR_DCA_MEM_ATTACH_OUT_ALLOC_FLAGS,
+		      &resp->alloc_flags, sizeof(resp->alloc_flags));
+	fill_attr_out(cmd, HNS_IB_ATTR_DCA_MEM_ATTACH_OUT_ALLOC_PAGES,
+		      &resp->alloc_pages, sizeof(resp->alloc_pages));
+	ret = execute_ioctl(&ctx->ibv_ctx.context, cmd);
+	if (ret)
+		verbs_err(&ctx->ibv_ctx,
+			  "failed to attach DCA mem-%u, ret = %d.\n",
+			  handle, ret);
+
+	return ret;
+}
+
 static bool add_dca_mem_enabled(struct hns_roce_dca_ctx *ctx,
 				uint32_t alloc_size)
 {
@@ -226,7 +308,7 @@ static bool shrink_dca_mem_enabled(struct hns_roce_dca_ctx *ctx)
 	return enable;
 }
 
-int hns_roce_add_dca_mem(struct hns_roce_context *ctx, uint32_t size)
+static int add_dca_mem(struct hns_roce_context *ctx, uint32_t size)
 {
 	struct hns_roce_dca_ctx *dca_ctx = &ctx->dca_ctx;
 	struct hns_roce_dca_mem *mem;
@@ -310,3 +392,92 @@ void hns_roce_shrink_dca_mem(struct hns_roce_context *ctx)
 		dca_mem_cnt--;
 	}
 }
+
+static void config_dca_pages(void *addr, struct hns_roce_dca_buf *buf,
+			     uint32_t page_index, int page_count)
+{
+	void **pages = &buf->bufs[page_index];
+	int page_size = 1 << buf->shift;
+	int i;
+
+	for (i = 0; i < page_count; i++) {
+		pages[i] = addr;
+		addr += page_size;
+	}
+}
+
+static int setup_dca_buf(struct hns_roce_context *ctx, uint32_t handle,
+			 struct hns_roce_dca_buf *buf, uint32_t page_count)
+{
+	struct hns_roce_dca_ctx *dca_ctx = &ctx->dca_ctx;
+	struct hns_dca_mem_query_resp resp = {};
+	struct hns_roce_dca_mem *mem;
+	uint32_t idx = 0;
+	int ret;
+
+	while (idx < page_count && idx < buf->max_cnt) {
+		resp.page_count = 0;
+		ret = query_dca_mem(ctx, handle, idx, &resp);
+		if (ret)
+			return -ENOMEM;
+		if (resp.page_count < 1)
+			break;
+
+		pthread_spin_lock(&dca_ctx->lock);
+		mem = key_to_dca_mem(dca_ctx, resp.key);
+		if (mem && resp.offset < mem->buf.length) {
+			config_dca_pages(dca_mem_addr(mem, resp.offset),
+					 buf, idx, resp.page_count);
+		} else {
+			pthread_spin_unlock(&dca_ctx->lock);
+			break;
+		}
+		pthread_spin_unlock(&dca_ctx->lock);
+
+		idx += resp.page_count;
+	}
+
+	return (idx >= page_count) ? 0 : -ENOMEM;
+}
+
+#define DCA_EXPAND_MEM_TRY_TIMES	3
+int hns_roce_attach_dca_mem(struct hns_roce_context *ctx, uint32_t handle,
+			    struct hns_roce_dca_attach_attr *attr,
+			    uint32_t size, struct hns_roce_dca_buf *buf)
+{
+	uint32_t buf_pages = size >> buf->shift;
+	struct hns_dca_mem_attach_resp resp = {};
+	bool is_new_buf = true;
+	int try_times = 0;
+	int ret = 0;
+
+	do {
+		resp.alloc_pages = 0;
+		ret = attach_dca_mem(ctx, handle, attr, &resp);
+		if (ret)
+			break;
+
+		if (resp.alloc_pages >= buf_pages) {
+			is_new_buf = !!(resp.alloc_flags &
+				     HNS_DCA_ATTACH_OUT_FLAGS_NEW_BUFFER);
+			break;
+		}
+
+		ret = add_dca_mem(ctx, size);
+		if (ret)
+			break;
+	} while (try_times++ < DCA_EXPAND_MEM_TRY_TIMES);
+
+	if (ret || resp.alloc_pages < buf_pages) {
+		verbs_err(&ctx->ibv_ctx,
+			  "failed to attach, size %u count %u != %u, ret = %d.\n",
+			  size, buf_pages, resp.alloc_pages, ret);
+		return -ENOMEM;
+	}
+
+	/* No need config user address if DCA config not changed */
+	if (!is_new_buf && buf->bufs[0])
+		return 0;
+
+	return setup_dca_buf(ctx, handle, buf, buf_pages);
+}
diff --git a/providers/hns/hns_roce_u_hw_v2.c b/providers/hns/hns_roce_u_hw_v2.c
index 0a100b8..7a93456 100644
--- a/providers/hns/hns_roce_u_hw_v2.c
+++ b/providers/hns/hns_roce_u_hw_v2.c
@@ -199,19 +199,35 @@ static struct hns_roce_v2_cqe *next_cqe_sw_v2(struct hns_roce_cq *cq)
 	return get_sw_cqe_v2(cq, cq->cons_index);
 }
 
+static inline bool check_qp_dca_enable(struct hns_roce_qp *qp)
+{
+	return !!qp->dca_wqe.bufs;
+}
+
+static inline void *get_wqe(struct hns_roce_qp *qp, unsigned int offset)
+{
+	if (likely(qp->buf.buf))
+		return qp->buf.buf + offset;
+	else if (unlikely(check_qp_dca_enable(qp)))
+		return qp->dca_wqe.bufs[offset >> qp->dca_wqe.shift] +
+			(offset & ((1 << qp->dca_wqe.shift) - 1));
+	else
+		return NULL;
+}
+
 static void *get_recv_wqe_v2(struct hns_roce_qp *qp, unsigned int n)
 {
-	return qp->buf.buf + qp->rq.offset + (n << qp->rq.wqe_shift);
+	return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
 }
 
 static void *get_send_wqe(struct hns_roce_qp *qp, unsigned int n)
 {
-	return qp->buf.buf + qp->sq.offset + (n << qp->sq.wqe_shift);
+	return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
 }
 
 static void *get_send_sge_ex(struct hns_roce_qp *qp, unsigned int n)
 {
-	return qp->buf.buf + qp->ex_sge.offset + (n << qp->ex_sge.sge_shift);
+	return get_wqe(qp, qp->ex_sge.offset + (n << qp->ex_sge.sge_shift));
 }
 
 static void *get_srq_wqe(struct hns_roce_srq *srq, unsigned int n)
@@ -580,6 +596,73 @@ static void parse_cqe_for_req(struct hns_roce_v2_cqe *cqe, struct ibv_wc *wc,
 	wc->opcode = wc_send_op_map[opcode];
 }
 
+static bool check_dca_attach_enable(struct hns_roce_qp *qp)
+{
+	return check_qp_dca_enable(qp) &&
+	       (qp->flags & HNS_ROCE_QP_CAP_DYNAMIC_CTX_ATTACH);
+}
+
+static bool check_dca_detach_enable(struct hns_roce_qp *qp)
+{
+	return check_qp_dca_enable(qp) &&
+	       (qp->flags & HNS_ROCE_QP_CAP_DYNAMIC_CTX_DETACH);
+}
+
+static int dca_attach_qp_buf(struct hns_roce_context *ctx,
+			     struct hns_roce_qp *qp)
+{
+	struct hns_roce_dca_attach_attr attr = {};
+	uint32_t idx;
+	int ret;
+
+	hns_roce_spin_lock(&qp->sq.hr_lock);
+	hns_roce_spin_lock(&qp->rq.hr_lock);
+
+	if (qp->sq.wqe_cnt > 0) {
+		idx = qp->sq.head & (qp->sq.wqe_cnt - 1);
+		attr.sq_offset = idx << qp->sq.wqe_shift;
+	}
+
+	if (qp->ex_sge.sge_cnt > 0) {
+		idx = qp->next_sge & (qp->ex_sge.sge_cnt - 1);
+		attr.sge_offset = idx << qp->ex_sge.sge_shift;
+	}
+
+	if (qp->rq.wqe_cnt > 0) {
+		idx = qp->rq.head & (qp->rq.wqe_cnt - 1);
+		attr.rq_offset = idx << qp->rq.wqe_shift;
+	}
+
+
+	ret = hns_roce_attach_dca_mem(ctx, qp->verbs_qp.qp.handle, &attr,
+								  qp->buf_size, &qp->dca_wqe);
+
+	hns_roce_spin_unlock(&qp->rq.hr_lock);
+	hns_roce_spin_unlock(&qp->sq.hr_lock);
+
+	return ret;
+}
+
+static void dca_detach_qp_buf(struct hns_roce_context *ctx,
+			      struct hns_roce_qp *qp)
+{
+	struct hns_roce_dca_detach_attr attr;
+	bool is_empty;
+
+	hns_roce_spin_lock(&qp->sq.hr_lock);
+	hns_roce_spin_lock(&qp->rq.hr_lock);
+
+	is_empty = qp->sq.head == qp->sq.tail && qp->rq.head == qp->rq.tail;
+	if (is_empty && qp->sq.wqe_cnt > 0)
+		attr.sq_index = qp->sq.head & (qp->sq.wqe_cnt - 1);
+
+	hns_roce_spin_unlock(&qp->rq.hr_lock);
+	hns_roce_spin_unlock(&qp->sq.hr_lock);
+
+	if (is_empty && qp->sq.wqe_cnt > 0)
+		hns_roce_detach_dca_mem(ctx, qp->verbs_qp.qp.handle, &attr);
+}
+
 static void cqe_proc_sq(struct hns_roce_qp *hr_qp, uint32_t wqe_idx,
 			struct hns_roce_cq *cq)
 {
@@ -919,6 +1002,9 @@ static int hns_roce_u_v2_poll_cq(struct ibv_cq *ibvcq, int ne,
 
 	for (npolled = 0; npolled < ne; ++npolled) {
 		err = hns_roce_poll_one(ctx, &qp, cq, wc + npolled);
+		if (qp && check_dca_detach_enable(qp))
+			dca_detach_qp_buf(ctx, qp);
+
 		if (err != V2_CQ_OK)
 			break;
 	}
@@ -970,7 +1056,7 @@ static int check_qp_send(struct hns_roce_qp *qp, struct hns_roce_context *ctx)
 
 	if (unlikely(ibvqp->state == IBV_QPS_RESET ||
 		     ibvqp->state == IBV_QPS_INIT ||
-		     ibvqp->state == IBV_QPS_RTR)){
+		     ibvqp->state == IBV_QPS_RTR)) {
 		verbs_err(verbs_get_ctx(qp->verbs_qp.qp.context),
 			  "unsupported qp state, state = %d.\n", ibvqp->state);
 		return EINVAL;
@@ -980,6 +1066,14 @@ static int check_qp_send(struct hns_roce_qp *qp, struct hns_roce_context *ctx)
 		return EIO;
 	}
 
+	if (check_dca_attach_enable(qp)) {
+		ret = dca_attach_qp_buf(ctx, qp);
+		if (ret)
+			verbs_err_datapath(&ctx->ibv_ctx,
+				"failed to attach QP-%u send, ret = %d.\n",
+				qp->verbs_qp.qp.qp_num, ret);
+	}
+
 	return ret;
 }
 
@@ -1347,6 +1441,13 @@ static int set_rc_inl(struct hns_roce_qp *qp, const struct ibv_send_wr *wr,
 	return 0;
 }
 
+static inline void fill_rc_dca_fields(uint32_t qp_num,
+				      struct hns_roce_rc_sq_wqe *wqe)
+{
+	hr_reg_write(wqe, RCWQE_SQPN_L, qp_num);
+	hr_reg_write(wqe, RCWQE_SQPN_H, qp_num >> RCWQE_SQPN_L_WIDTH);
+}
+
 static void set_bind_mw_seg(struct hns_roce_rc_sq_wqe *wqe,
 			    const struct ibv_send_wr *wr)
 {
@@ -1454,6 +1555,9 @@ static int set_rc_wqe(void *wqe, struct hns_roce_qp *qp, struct ibv_send_wr *wr,
 		return ret;
 
 wqe_valid:
+	if (check_qp_dca_enable(qp))
+		fill_rc_dca_fields(qp->verbs_qp.qp.qp_num, rc_sq_wqe);
+
 	enable_wqe(qp, rc_sq_wqe, qp->sq.head + nreq);
 
 	return 0;
@@ -1563,6 +1667,14 @@ static int check_qp_recv(struct hns_roce_qp *qp, struct hns_roce_context *ctx)
 		return EIO;
 	}
 
+	if (check_dca_attach_enable(qp)) {
+		ret = dca_attach_qp_buf(ctx, qp);
+		if (ret)
+			verbs_err_datapath(&ctx->ibv_ctx,
+				"failed to attach QP-%u recv, ret = %d.\n",
+				qp->verbs_qp.qp.qp_num, ret);
+	}
+
 	return ret;
 }
 
@@ -1758,6 +1870,7 @@ static void record_qp_attr(struct ibv_qp *qp, struct ibv_qp_attr *attr,
 static int hns_roce_u_v2_modify_qp(struct ibv_qp *qp, struct ibv_qp_attr *attr,
 				   int attr_mask)
 {
+	struct hns_roce_context *ctx = to_hr_ctx(qp->context);
 	struct hns_roce_modify_qp_ex_resp resp_ex = {};
 	struct hns_roce_modify_qp_ex cmd_ex = {};
 	struct hns_roce_qp *hr_qp = to_hr_qp(qp);
@@ -1804,6 +1917,10 @@ static int hns_roce_u_v2_modify_qp(struct ibv_qp *qp, struct ibv_qp_attr *attr,
 		hns_roce_init_qp_indices(to_hr_qp(qp));
 	}
 
+	/* Try to shrink the DCA mem */
+	if (ctx->dca_ctx.mem_cnt > 0)
+		hns_roce_shrink_dca_mem(ctx);
+
 	record_qp_attr(qp, attr, attr_mask);
 
 	return ret;
diff --git a/providers/hns/hns_roce_u_hw_v2.h b/providers/hns/hns_roce_u_hw_v2.h
index 1a7b828..50a920f 100644
--- a/providers/hns/hns_roce_u_hw_v2.h
+++ b/providers/hns/hns_roce_u_hw_v2.h
@@ -237,6 +237,8 @@ struct hns_roce_rc_sq_wqe {
 #define RCWQE_MW_RR_EN RCWQE_FIELD_LOC(259, 259)
 #define RCWQE_MW_RW_EN RCWQE_FIELD_LOC(260, 260)
 
+#define RCWQE_SQPN_L_WIDTH 2
+
 struct hns_roce_v2_wqe_data_seg {
 	__le32		len;
 	__le32		lkey;
diff --git a/providers/hns/hns_roce_u_verbs.c b/providers/hns/hns_roce_u_verbs.c
index 69bcc13..248d862 100644
--- a/providers/hns/hns_roce_u_verbs.c
+++ b/providers/hns/hns_roce_u_verbs.c
@@ -1311,6 +1311,14 @@ static int calc_qp_buff_size(struct hns_roce_device *hr_dev,
 	return 0;
 }
 
+static inline bool check_qp_support_dca(bool pool_en, enum ibv_qp_type qp_type)
+{
+	if (pool_en && (qp_type == IBV_QPT_RC || qp_type == IBV_QPT_XRC_SEND))
+		return true;
+
+	return false;
+}
+
 static void qp_free_wqe(struct hns_roce_qp *qp)
 {
 	free_recv_rinl_buf(&qp->rq_rinl_buf);
@@ -1322,8 +1330,8 @@ static void qp_free_wqe(struct hns_roce_qp *qp)
 	hns_roce_free_buf(&qp->buf);
 }
 
-static int qp_alloc_wqe(struct ibv_qp_cap *cap, struct hns_roce_qp *qp,
-			struct hns_roce_context *ctx)
+static int qp_alloc_wqe(struct ibv_qp_init_attr_ex *attr,
+			struct hns_roce_qp *qp, struct hns_roce_context *ctx)
 {
 	struct hns_roce_device *hr_dev = to_hr_dev(ctx->ibv_ctx.context.device);
 
@@ -1341,12 +1349,24 @@ static int qp_alloc_wqe(struct ibv_qp_cap *cap, struct hns_roce_qp *qp,
 	}
 
 	if (qp->rq_rinl_buf.wqe_cnt) {
-		if (alloc_recv_rinl_buf(cap->max_recv_sge, &qp->rq_rinl_buf))
+		if (alloc_recv_rinl_buf(attr->cap.max_recv_sge,
+					&qp->rq_rinl_buf))
 			goto err_alloc;
 	}
 
-	if (hns_roce_alloc_buf(&qp->buf, qp->buf_size, 1 << qp->pageshift))
-		goto err_alloc;
+	if (check_qp_support_dca(ctx->dca_ctx.max_size != 0, attr->qp_type)) {
+		/* when DCA is enabled, use a buffer list to store page addr */
+		qp->buf.buf = NULL;
+		qp->dca_wqe.max_cnt = hr_hw_page_count(qp->buf_size);
+		qp->dca_wqe.shift = HNS_HW_PAGE_SHIFT;
+		qp->dca_wqe.bufs = calloc(qp->dca_wqe.max_cnt, sizeof(void *));
+		if (!qp->dca_wqe.bufs)
+			goto err_alloc;
+	} else {
+		if (hns_roce_alloc_buf(&qp->buf, qp->buf_size,
+				       HNS_HW_PAGE_SIZE))
+			goto err_alloc;
+	}
 
 	return 0;
 
@@ -1636,7 +1656,7 @@ static int hns_roce_alloc_qp_buf(struct ibv_qp_init_attr_ex *attr,
 {
 	int ret;
 
-	ret = qp_alloc_wqe(&attr->cap, qp, ctx);
+	ret = qp_alloc_wqe(attr, qp, ctx);
 	if (ret)
 		return ret;
 
-- 
2.33.0