RDMA/erdma: Allocate doorbell records from dma pool

Currently, the 8 byte doorbell record is allocated along with the queue
buffer, which may result in waste of dma space when the queue buffer is
page aligned. To address this issue, we introduce a dma pool named
db_pool and allocate doorbell record from it.

Reviewed-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Boshi Yu <boshiyu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240311113821.22482-2-boshiyu@alibaba-inc.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

6 files changed, 167 insertions, 101 deletions

diff --git a/drivers/infiniband/hw/erdma/erdma.h b/drivers/infiniband/hw/erdma/erdma.h
index 5df401a30cb9b..e116263a608fe 100644
--- a/drivers/infiniband/hw/erdma/erdma.h
+++ b/drivers/infiniband/hw/erdma/erdma.h
@@ -34,6 +34,7 @@ struct erdma_eq {
 
 	void __iomem *db;
 	u64 *db_record;
+	dma_addr_t db_record_dma_addr;
 };
 
 struct erdma_cmdq_sq {
@@ -49,6 +50,7 @@ struct erdma_cmdq_sq {
 	u16 wqebb_cnt;
 
 	u64 *db_record;
+	dma_addr_t db_record_dma_addr;
 };
 
 struct erdma_cmdq_cq {
@@ -62,6 +64,7 @@ struct erdma_cmdq_cq {
 	u32 cmdsn;
 
 	u64 *db_record;
+	dma_addr_t db_record_dma_addr;
 
 	atomic64_t armed_num;
 };
@@ -177,9 +180,6 @@ enum {
 	ERDMA_RES_CNT = 2,
 };
 
-#define ERDMA_EXTRA_BUFFER_SIZE ERDMA_DB_SIZE
-#define WARPPED_BUFSIZE(size) ((size) + ERDMA_EXTRA_BUFFER_SIZE)
-
 struct erdma_dev {
 	struct ib_device ibdev;
 	struct net_device *netdev;
@@ -213,6 +213,7 @@ struct erdma_dev {
 	atomic_t num_ctx;
 	struct list_head cep_list;
 
+	struct dma_pool *db_pool;
 	struct dma_pool *resp_pool;
 };
 
diff --git a/drivers/infiniband/hw/erdma/erdma_cmdq.c b/drivers/infiniband/hw/erdma/erdma_cmdq.c
index a151a7bdd5049..c2c666040949e 100644
--- a/drivers/infiniband/hw/erdma/erdma_cmdq.c
+++ b/drivers/infiniband/hw/erdma/erdma_cmdq.c
@@ -89,20 +89,19 @@ static int erdma_cmdq_sq_init(struct erdma_dev *dev)
 {
 	struct erdma_cmdq *cmdq = &dev->cmdq;
 	struct erdma_cmdq_sq *sq = &cmdq->sq;
-	u32 buf_size;
 
 	sq->wqebb_cnt = SQEBB_COUNT(ERDMA_CMDQ_SQE_SIZE);
 	sq->depth = cmdq->max_outstandings * sq->wqebb_cnt;
 
-	buf_size = sq->depth << SQEBB_SHIFT;
-
-	sq->qbuf =
-		dma_alloc_coherent(&dev->pdev->dev, WARPPED_BUFSIZE(buf_size),
-				   &sq->qbuf_dma_addr, GFP_KERNEL);
+	sq->qbuf = dma_alloc_coherent(&dev->pdev->dev, sq->depth << SQEBB_SHIFT,
+				      &sq->qbuf_dma_addr, GFP_KERNEL);
 	if (!sq->qbuf)
 		return -ENOMEM;
 
-	sq->db_record = (u64 *)(sq->qbuf + buf_size);
+	sq->db_record = dma_pool_zalloc(dev->db_pool, GFP_KERNEL,
+					&sq->db_record_dma_addr);
+	if (!sq->db_record)
+		goto err_out;
 
 	spin_lock_init(&sq->lock);
 
@@ -112,29 +111,35 @@ static int erdma_cmdq_sq_init(struct erdma_dev *dev)
 			  lower_32_bits(sq->qbuf_dma_addr));
 	erdma_reg_write32(dev, ERDMA_REGS_CMDQ_DEPTH_REG, sq->depth);
 	erdma_reg_write64(dev, ERDMA_CMDQ_SQ_DB_HOST_ADDR_REG,
-			  sq->qbuf_dma_addr + buf_size);
+			  sq->db_record_dma_addr);
 
 	return 0;
+
+err_out:
+	dma_free_coherent(&dev->pdev->dev, sq->depth << SQEBB_SHIFT,
+			  sq->qbuf, sq->qbuf_dma_addr);
+
+	return -ENOMEM;
 }
 
 static int erdma_cmdq_cq_init(struct erdma_dev *dev)
 {
 	struct erdma_cmdq *cmdq = &dev->cmdq;
 	struct erdma_cmdq_cq *cq = &cmdq->cq;
-	u32 buf_size;
 
 	cq->depth = cmdq->sq.depth;
-	buf_size = cq->depth << CQE_SHIFT;
-
-	cq->qbuf =
-		dma_alloc_coherent(&dev->pdev->dev, WARPPED_BUFSIZE(buf_size),
-				   &cq->qbuf_dma_addr, GFP_KERNEL | __GFP_ZERO);
+	cq->qbuf = dma_alloc_coherent(&dev->pdev->dev, cq->depth << CQE_SHIFT,
+				      &cq->qbuf_dma_addr,
+				      GFP_KERNEL | __GFP_ZERO);
 	if (!cq->qbuf)
 		return -ENOMEM;
 
 	spin_lock_init(&cq->lock);
 
-	cq->db_record = (u64 *)(cq->qbuf + buf_size);
+	cq->db_record = dma_pool_zalloc(dev->db_pool, GFP_KERNEL,
+					&cq->db_record_dma_addr);
+	if (!cq->db_record)
+		goto err_out;
 
 	atomic64_set(&cq->armed_num, 0);
 
@@ -143,23 +148,26 @@ static int erdma_cmdq_cq_init(struct erdma_dev *dev)
 	erdma_reg_write32(dev, ERDMA_REGS_CMDQ_CQ_ADDR_L_REG,
 			  lower_32_bits(cq->qbuf_dma_addr));
 	erdma_reg_write64(dev, ERDMA_CMDQ_CQ_DB_HOST_ADDR_REG,
-			  cq->qbuf_dma_addr + buf_size);
+			  cq->db_record_dma_addr);
 
 	return 0;
+
+err_out:
+	dma_free_coherent(&dev->pdev->dev, cq->depth << CQE_SHIFT, cq->qbuf,
+			  cq->qbuf_dma_addr);
+
+	return -ENOMEM;
 }
 
 static int erdma_cmdq_eq_init(struct erdma_dev *dev)
 {
 	struct erdma_cmdq *cmdq = &dev->cmdq;
 	struct erdma_eq *eq = &cmdq->eq;
-	u32 buf_size;
 
 	eq->depth = cmdq->max_outstandings;
-	buf_size = eq->depth << EQE_SHIFT;
-
-	eq->qbuf =
-		dma_alloc_coherent(&dev->pdev->dev, WARPPED_BUFSIZE(buf_size),
-				   &eq->qbuf_dma_addr, GFP_KERNEL | __GFP_ZERO);
+	eq->qbuf = dma_alloc_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT,
+				      &eq->qbuf_dma_addr,
+				      GFP_KERNEL | __GFP_ZERO);
 	if (!eq->qbuf)
 		return -ENOMEM;
 
@@ -167,7 +175,10 @@ static int erdma_cmdq_eq_init(struct erdma_dev *dev)
 	atomic64_set(&eq->event_num, 0);
 
 	eq->db = dev->func_bar + ERDMA_REGS_CEQ_DB_BASE_REG;
-	eq->db_record = (u64 *)(eq->qbuf + buf_size);
+	eq->db_record = dma_pool_zalloc(dev->db_pool, GFP_KERNEL,
+					&eq->db_record_dma_addr);
+	if (!eq->db_record)
+		goto err_out;
 
 	erdma_reg_write32(dev, ERDMA_REGS_CMDQ_EQ_ADDR_H_REG,
 			  upper_32_bits(eq->qbuf_dma_addr));
@@ -175,9 +186,15 @@ static int erdma_cmdq_eq_init(struct erdma_dev *dev)
 			  lower_32_bits(eq->qbuf_dma_addr));
 	erdma_reg_write32(dev, ERDMA_REGS_CMDQ_EQ_DEPTH_REG, eq->depth);
 	erdma_reg_write64(dev, ERDMA_CMDQ_EQ_DB_HOST_ADDR_REG,
-			  eq->qbuf_dma_addr + buf_size);
+			  eq->db_record_dma_addr);
 
 	return 0;
+
+err_out:
+	dma_free_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT, eq->qbuf,
+			  eq->qbuf_dma_addr);
+
+	return -ENOMEM;
 }
 
 int erdma_cmdq_init(struct erdma_dev *dev)
@@ -211,17 +228,19 @@ int erdma_cmdq_init(struct erdma_dev *dev)
 	return 0;
 
 err_destroy_cq:
-	dma_free_coherent(&dev->pdev->dev,
-			  (cmdq->cq.depth << CQE_SHIFT) +
-				  ERDMA_EXTRA_BUFFER_SIZE,
+	dma_free_coherent(&dev->pdev->dev, cmdq->cq.depth << CQE_SHIFT,
 			  cmdq->cq.qbuf, cmdq->cq.qbuf_dma_addr);
 
+	dma_pool_free(dev->db_pool, cmdq->cq.db_record,
+		      cmdq->cq.db_record_dma_addr);
+
 err_destroy_sq:
-	dma_free_coherent(&dev->pdev->dev,
-			  (cmdq->sq.depth << SQEBB_SHIFT) +
-				  ERDMA_EXTRA_BUFFER_SIZE,
+	dma_free_coherent(&dev->pdev->dev, cmdq->sq.depth << SQEBB_SHIFT,
 			  cmdq->sq.qbuf, cmdq->sq.qbuf_dma_addr);
 
+	dma_pool_free(dev->db_pool, cmdq->sq.db_record,
+		      cmdq->sq.db_record_dma_addr);
+
 	return err;
 }
 
@@ -238,18 +257,23 @@ void erdma_cmdq_destroy(struct erdma_dev *dev)
 
 	clear_bit(ERDMA_CMDQ_STATE_OK_BIT, &cmdq->state);
 
-	dma_free_coherent(&dev->pdev->dev,
-			  (cmdq->eq.depth << EQE_SHIFT) +
-				  ERDMA_EXTRA_BUFFER_SIZE,
+	dma_free_coherent(&dev->pdev->dev, cmdq->eq.depth << EQE_SHIFT,
 			  cmdq->eq.qbuf, cmdq->eq.qbuf_dma_addr);
-	dma_free_coherent(&dev->pdev->dev,
-			  (cmdq->sq.depth << SQEBB_SHIFT) +
-				  ERDMA_EXTRA_BUFFER_SIZE,
+
+	dma_pool_free(dev->db_pool, cmdq->eq.db_record,
+		      cmdq->eq.db_record_dma_addr);
+
+	dma_free_coherent(&dev->pdev->dev, cmdq->sq.depth << SQEBB_SHIFT,
 			  cmdq->sq.qbuf, cmdq->sq.qbuf_dma_addr);
-	dma_free_coherent(&dev->pdev->dev,
-			  (cmdq->cq.depth << CQE_SHIFT) +
-				  ERDMA_EXTRA_BUFFER_SIZE,
+
+	dma_pool_free(dev->db_pool, cmdq->sq.db_record,
+		      cmdq->sq.db_record_dma_addr);
+
+	dma_free_coherent(&dev->pdev->dev, cmdq->cq.depth << CQE_SHIFT,
 			  cmdq->cq.qbuf, cmdq->cq.qbuf_dma_addr);
+
+	dma_pool_free(dev->db_pool, cmdq->cq.db_record,
+		      cmdq->cq.db_record_dma_addr);
 }
 
 static void *get_next_valid_cmdq_cqe(struct erdma_cmdq *cmdq)
diff --git a/drivers/infiniband/hw/erdma/erdma_eq.c b/drivers/infiniband/hw/erdma/erdma_eq.c
index ea47cb21fdb8c..809c33628f38c 100644
--- a/drivers/infiniband/hw/erdma/erdma_eq.c
+++ b/drivers/infiniband/hw/erdma/erdma_eq.c
@@ -83,14 +83,12 @@ void erdma_aeq_event_handler(struct erdma_dev *dev)
 int erdma_aeq_init(struct erdma_dev *dev)
 {
 	struct erdma_eq *eq = &dev->aeq;
-	u32 buf_size;
 
 	eq->depth = ERDMA_DEFAULT_EQ_DEPTH;
-	buf_size = eq->depth << EQE_SHIFT;
 
-	eq->qbuf =
-		dma_alloc_coherent(&dev->pdev->dev, WARPPED_BUFSIZE(buf_size),
-				   &eq->qbuf_dma_addr, GFP_KERNEL | __GFP_ZERO);
+	eq->qbuf = dma_alloc_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT,
+				      &eq->qbuf_dma_addr,
+				      GFP_KERNEL | __GFP_ZERO);
 	if (!eq->qbuf)
 		return -ENOMEM;
 
@@ -99,7 +97,10 @@ int erdma_aeq_init(struct erdma_dev *dev)
 	atomic64_set(&eq->notify_num, 0);
 
 	eq->db = dev->func_bar + ERDMA_REGS_AEQ_DB_REG;
-	eq->db_record = (u64 *)(eq->qbuf + buf_size);
+	eq->db_record = dma_pool_zalloc(dev->db_pool, GFP_KERNEL,
+					&eq->db_record_dma_addr);
+	if (!eq->db_record)
+		goto err_out;
 
 	erdma_reg_write32(dev, ERDMA_REGS_AEQ_ADDR_H_REG,
 			  upper_32_bits(eq->qbuf_dma_addr));
@@ -107,18 +108,25 @@ int erdma_aeq_init(struct erdma_dev *dev)
 			  lower_32_bits(eq->qbuf_dma_addr));
 	erdma_reg_write32(dev, ERDMA_REGS_AEQ_DEPTH_REG, eq->depth);
 	erdma_reg_write64(dev, ERDMA_AEQ_DB_HOST_ADDR_REG,
-			  eq->qbuf_dma_addr + buf_size);
+			  eq->db_record_dma_addr);
 
 	return 0;
+
+err_out:
+	dma_free_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT, eq->qbuf,
+			  eq->qbuf_dma_addr);
+
+	return -ENOMEM;
 }
 
 void erdma_aeq_destroy(struct erdma_dev *dev)
 {
 	struct erdma_eq *eq = &dev->aeq;
 
-	dma_free_coherent(&dev->pdev->dev,
-			  WARPPED_BUFSIZE(eq->depth << EQE_SHIFT), eq->qbuf,
+	dma_free_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT, eq->qbuf,
 			  eq->qbuf_dma_addr);
+
+	dma_pool_free(dev->db_pool, eq->db_record, eq->db_record_dma_addr);
 }
 
 void erdma_ceq_completion_handler(struct erdma_eq_cb *ceq_cb)
@@ -209,7 +217,6 @@ static void erdma_free_ceq_irq(struct erdma_dev *dev, u16 ceqn)
 static int create_eq_cmd(struct erdma_dev *dev, u32 eqn, struct erdma_eq *eq)
 {
 	struct erdma_cmdq_create_eq_req req;
-	dma_addr_t db_info_dma_addr;
 
 	erdma_cmdq_build_reqhdr(&req.hdr, CMDQ_SUBMOD_COMMON,
 				CMDQ_OPCODE_CREATE_EQ);
@@ -219,9 +226,8 @@ static int create_eq_cmd(struct erdma_dev *dev, u32 eqn, struct erdma_eq *eq)
 	req.qtype = ERDMA_EQ_TYPE_CEQ;
 	/* Vector index is the same as EQN. */
 	req.vector_idx = eqn;
-	db_info_dma_addr = eq->qbuf_dma_addr + (eq->depth << EQE_SHIFT);
-	req.db_dma_addr_l = lower_32_bits(db_info_dma_addr);
-	req.db_dma_addr_h = upper_32_bits(db_info_dma_addr);
+	req.db_dma_addr_l = lower_32_bits(eq->db_record_dma_addr);
+	req.db_dma_addr_h = upper_32_bits(eq->db_record_dma_addr);
 
 	return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
 }
@@ -229,12 +235,12 @@ static int create_eq_cmd(struct erdma_dev *dev, u32 eqn, struct erdma_eq *eq)
 static int erdma_ceq_init_one(struct erdma_dev *dev, u16 ceqn)
 {
 	struct erdma_eq *eq = &dev->ceqs[ceqn].eq;
-	u32 buf_size = ERDMA_DEFAULT_EQ_DEPTH << EQE_SHIFT;
 	int ret;
 
-	eq->qbuf =
-		dma_alloc_coherent(&dev->pdev->dev, WARPPED_BUFSIZE(buf_size),
-				   &eq->qbuf_dma_addr, GFP_KERNEL | __GFP_ZERO);
+	eq->depth = ERDMA_DEFAULT_EQ_DEPTH;
+	eq->qbuf = dma_alloc_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT,
+				      &eq->qbuf_dma_addr,
+				      GFP_KERNEL | __GFP_ZERO);
 	if (!eq->qbuf)
 		return -ENOMEM;
 
@@ -242,10 +248,17 @@ static int erdma_ceq_init_one(struct erdma_dev *dev, u16 ceqn)
 	atomic64_set(&eq->event_num, 0);
 	atomic64_set(&eq->notify_num, 0);
 
-	eq->depth = ERDMA_DEFAULT_EQ_DEPTH;
 	eq->db = dev->func_bar + ERDMA_REGS_CEQ_DB_BASE_REG +
 		 (ceqn + 1) * ERDMA_DB_SIZE;
-	eq->db_record = (u64 *)(eq->qbuf + buf_size);
+
+	eq->db_record = dma_pool_zalloc(dev->db_pool, GFP_KERNEL,
+					&eq->db_record_dma_addr);
+	if (!eq->db_record) {
+		dma_free_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT,
+				  eq->qbuf, eq->qbuf_dma_addr);
+		return -ENOMEM;
+	}
+
 	eq->ci = 0;
 	dev->ceqs[ceqn].dev = dev;
 
@@ -259,7 +272,6 @@ static int erdma_ceq_init_one(struct erdma_dev *dev, u16 ceqn)
 static void erdma_ceq_uninit_one(struct erdma_dev *dev, u16 ceqn)
 {
 	struct erdma_eq *eq = &dev->ceqs[ceqn].eq;
-	u32 buf_size = ERDMA_DEFAULT_EQ_DEPTH << EQE_SHIFT;
 	struct erdma_cmdq_destroy_eq_req req;
 	int err;
 
@@ -276,8 +288,9 @@ static void erdma_ceq_uninit_one(struct erdma_dev *dev, u16 ceqn)
 	if (err)
 		return;
 
-	dma_free_coherent(&dev->pdev->dev, WARPPED_BUFSIZE(buf_size), eq->qbuf,
+	dma_free_coherent(&dev->pdev->dev, eq->depth << EQE_SHIFT, eq->qbuf,
 			  eq->qbuf_dma_addr);
+	dma_pool_free(dev->db_pool, eq->db_record, eq->db_record_dma_addr);
 }
 
 int erdma_ceqs_init(struct erdma_dev *dev)
diff --git a/drivers/infiniband/hw/erdma/erdma_main.c b/drivers/infiniband/hw/erdma/erdma_main.c
index 472939172f0c6..7080f8a71ec43 100644
--- a/drivers/infiniband/hw/erdma/erdma_main.c
+++ b/drivers/infiniband/hw/erdma/erdma_main.c
@@ -178,16 +178,26 @@ static int erdma_device_init(struct erdma_dev *dev, struct pci_dev *pdev)
 	if (!dev->resp_pool)
 		return -ENOMEM;
 
+	dev->db_pool = dma_pool_create("erdma_db_pool", &pdev->dev,
+				       ERDMA_DB_SIZE, ERDMA_DB_SIZE, 0);
+	if (!dev->db_pool) {
+		ret = -ENOMEM;
+		goto destroy_resp_pool;
+	}
+
 	ret = dma_set_mask_and_coherent(&pdev->dev,
 					DMA_BIT_MASK(ERDMA_PCI_WIDTH));
 	if (ret)
-		goto destroy_pool;
+		goto destroy_db_pool;
 
 	dma_set_max_seg_size(&pdev->dev, UINT_MAX);
 
 	return 0;
 
-destroy_pool:
+destroy_db_pool:
+	dma_pool_destroy(dev->db_pool);
+
+destroy_resp_pool:
 	dma_pool_destroy(dev->resp_pool);
 
 	return ret;
@@ -195,6 +205,7 @@ destroy_pool:
 
 static void erdma_device_uninit(struct erdma_dev *dev)
 {
+	dma_pool_destroy(dev->db_pool);
 	dma_pool_destroy(dev->resp_pool);
 }
 
diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index 23dfc01603f8a..b78ddca1483ea 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -76,10 +76,8 @@ static int create_qp_cmd(struct erdma_ucontext *uctx, struct erdma_qp *qp)
 
 		req.rq_buf_addr = qp->kern_qp.rq_buf_dma_addr;
 		req.sq_buf_addr = qp->kern_qp.sq_buf_dma_addr;
-		req.sq_db_info_dma_addr = qp->kern_qp.sq_buf_dma_addr +
-					  (qp->attrs.sq_size << SQEBB_SHIFT);
-		req.rq_db_info_dma_addr = qp->kern_qp.rq_buf_dma_addr +
-					  (qp->attrs.rq_size << RQE_SHIFT);
+		req.sq_db_info_dma_addr = qp->kern_qp.sq_db_info_dma_addr;
+		req.rq_db_info_dma_addr = qp->kern_qp.rq_db_info_dma_addr;
 	} else {
 		user_qp = &qp->user_qp;
 		req.sq_cqn_mtt_cfg = FIELD_PREP(
@@ -209,8 +207,7 @@ static int create_cq_cmd(struct erdma_ucontext *uctx, struct erdma_cq *cq)
 				       ERDMA_MR_MTT_0LEVEL);
 
 		req.first_page_offset = 0;
-		req.cq_db_info_addr =
-			cq->kern_cq.qbuf_dma_addr + (cq->depth << CQE_SHIFT);
+		req.cq_db_info_addr = cq->kern_cq.db_record_dma_addr;
 	} else {
 		mem = &cq->user_cq.qbuf_mem;
 		req.cfg0 |=
@@ -482,16 +479,24 @@ static void free_kernel_qp(struct erdma_qp *qp)
 	vfree(qp->kern_qp.rwr_tbl);
 
 	if (qp->kern_qp.sq_buf)
-		dma_free_coherent(
-			&dev->pdev->dev,
-			WARPPED_BUFSIZE(qp->attrs.sq_size << SQEBB_SHIFT),
-			qp->kern_qp.sq_buf, qp->kern_qp.sq_buf_dma_addr);
+		dma_free_coherent(&dev->pdev->dev,
+				  qp->attrs.sq_size << SQEBB_SHIFT,
+				  qp->kern_qp.sq_buf,
+				  qp->kern_qp.sq_buf_dma_addr);
+
+	if (qp->kern_qp.sq_db_info)
+		dma_pool_free(dev->db_pool, qp->kern_qp.sq_db_info,
+			      qp->kern_qp.sq_db_info_dma_addr);
 
 	if (qp->kern_qp.rq_buf)
-		dma_free_coherent(
-			&dev->pdev->dev,
-			WARPPED_BUFSIZE(qp->attrs.rq_size << RQE_SHIFT),
-			qp->kern_qp.rq_buf, qp->kern_qp.rq_buf_dma_addr);
+		dma_free_coherent(&dev->pdev->dev,
+				  qp->attrs.rq_size << RQE_SHIFT,
+				  qp->kern_qp.rq_buf,
+				  qp->kern_qp.rq_buf_dma_addr);
+
+	if (qp->kern_qp.rq_db_info)
+		dma_pool_free(dev->db_pool, qp->kern_qp.rq_db_info,
+			      qp->kern_qp.rq_db_info_dma_addr);
 }
 
 static int init_kernel_qp(struct erdma_dev *dev, struct erdma_qp *qp,
@@ -516,20 +521,27 @@ static int init_kernel_qp(struct erdma_dev *dev, struct erdma_qp *qp,
 	if (!kqp->swr_tbl || !kqp->rwr_tbl)
 		goto err_out;
 
-	size = (qp->attrs.sq_size << SQEBB_SHIFT) + ERDMA_EXTRA_BUFFER_SIZE;
+	size = qp->attrs.sq_size << SQEBB_SHIFT;
 	kqp->sq_buf = dma_alloc_coherent(&dev->pdev->dev, size,
 					 &kqp->sq_buf_dma_addr, GFP_KERNEL);
 	if (!kqp->sq_buf)
 		goto err_out;
 
-	size = (qp->attrs.rq_size << RQE_SHIFT) + ERDMA_EXTRA_BUFFER_SIZE;
+	kqp->sq_db_info = dma_pool_zalloc(dev->db_pool, GFP_KERNEL,
+					  &kqp->sq_db_info_dma_addr);
+	if (!kqp->sq_db_info)
+		goto err_out;
+
+	size = qp->attrs.rq_size << RQE_SHIFT;
 	kqp->rq_buf = dma_alloc_coherent(&dev->pdev->dev, size,
 					 &kqp->rq_buf_dma_addr, GFP_KERNEL);
 	if (!kqp->rq_buf)
 		goto err_out;
 
-	kqp->sq_db_info = kqp->sq_buf + (qp->attrs.sq_size << SQEBB_SHIFT);
-	kqp->rq_db_info = kqp->rq_buf + (qp->attrs.rq_size << RQE_SHIFT);
+	kqp->rq_db_info = dma_pool_zalloc(dev->db_pool, GFP_KERNEL,
+					  &kqp->rq_db_info_dma_addr);
+	if (!kqp->rq_db_info)
+		goto err_out;
 
 	return 0;
 
@@ -1237,9 +1249,10 @@ int erdma_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 		return err;
 
 	if (rdma_is_kernel_res(&cq->ibcq.res)) {
-		dma_free_coherent(&dev->pdev->dev,
-				  WARPPED_BUFSIZE(cq->depth << CQE_SHIFT),
+		dma_free_coherent(&dev->pdev->dev, cq->depth << CQE_SHIFT,
 				  cq->kern_cq.qbuf, cq->kern_cq.qbuf_dma_addr);
+		dma_pool_free(dev->db_pool, cq->kern_cq.db_record,
+			      cq->kern_cq.db_record_dma_addr);
 	} else {
 		erdma_unmap_user_dbrecords(ctx, &cq->user_cq.user_dbr_page);
 		put_mtt_entries(dev, &cq->user_cq.qbuf_mem);
@@ -1279,16 +1292,7 @@ int erdma_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
 	wait_for_completion(&qp->safe_free);
 
 	if (rdma_is_kernel_res(&qp->ibqp.res)) {
-		vfree(qp->kern_qp.swr_tbl);
-		vfree(qp->kern_qp.rwr_tbl);
-		dma_free_coherent(
-			&dev->pdev->dev,
-			WARPPED_BUFSIZE(qp->attrs.rq_size << RQE_SHIFT),
-			qp->kern_qp.rq_buf, qp->kern_qp.rq_buf_dma_addr);
-		dma_free_coherent(
-			&dev->pdev->dev,
-			WARPPED_BUFSIZE(qp->attrs.sq_size << SQEBB_SHIFT),
-			qp->kern_qp.sq_buf, qp->kern_qp.sq_buf_dma_addr);
+		free_kernel_qp(qp);
 	} else {
 		put_mtt_entries(dev, &qp->user_qp.sq_mem);
 		put_mtt_entries(dev, &qp->user_qp.rq_mem);
@@ -1600,19 +1604,27 @@ static int erdma_init_kernel_cq(struct erdma_cq *cq)
 	struct erdma_dev *dev = to_edev(cq->ibcq.device);
 
 	cq->kern_cq.qbuf =
-		dma_alloc_coherent(&dev->pdev->dev,
-				   WARPPED_BUFSIZE(cq->depth << CQE_SHIFT),
+		dma_alloc_coherent(&dev->pdev->dev, cq->depth << CQE_SHIFT,
 				   &cq->kern_cq.qbuf_dma_addr, GFP_KERNEL);
 	if (!cq->kern_cq.qbuf)
 		return -ENOMEM;
 
-	cq->kern_cq.db_record =
-		(u64 *)(cq->kern_cq.qbuf + (cq->depth << CQE_SHIFT));
+	cq->kern_cq.db_record = dma_pool_zalloc(
+		dev->db_pool, GFP_KERNEL, &cq->kern_cq.db_record_dma_addr);
+	if (!cq->kern_cq.db_record)
+		goto err_out;
+
 	spin_lock_init(&cq->kern_cq.lock);
 	/* use default cqdb addr */
 	cq->kern_cq.db = dev->func_bar + ERDMA_BAR_CQDB_SPACE_OFFSET;
 
 	return 0;
+
+err_out:
+	dma_free_coherent(&dev->pdev->dev, cq->depth << CQE_SHIFT,
+			  cq->kern_cq.qbuf, cq->kern_cq.qbuf_dma_addr);
+
+	return -ENOMEM;
 }
 
 int erdma_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
@@ -1676,9 +1688,10 @@ err_free_res:
 		erdma_unmap_user_dbrecords(ctx, &cq->user_cq.user_dbr_page);
 		put_mtt_entries(dev, &cq->user_cq.qbuf_mem);
 	} else {
-		dma_free_coherent(&dev->pdev->dev,
-				  WARPPED_BUFSIZE(depth << CQE_SHIFT),
+		dma_free_coherent(&dev->pdev->dev, depth << CQE_SHIFT,
 				  cq->kern_cq.qbuf, cq->kern_cq.qbuf_dma_addr);
+		dma_pool_free(dev->db_pool, cq->kern_cq.db_record,
+			      cq->kern_cq.db_record_dma_addr);
 	}
 
 err_out_xa:
diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.h b/drivers/infiniband/hw/erdma/erdma_verbs.h
index db6018529ccc3..b02ffdc8c811d 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.h
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.h
@@ -170,6 +170,9 @@ struct erdma_kqp {
 	void *sq_db_info;
 	void *rq_db_info;
 
+	dma_addr_t sq_db_info_dma_addr;
+	dma_addr_t rq_db_info_dma_addr;
+
 	u8 sig_all;
 };
 
@@ -247,6 +250,7 @@ struct erdma_kcq_info {
 	spinlock_t lock;
 	u8 __iomem *db;
 	u64 *db_record;
+	dma_addr_t db_record_dma_addr;
 };
 
 struct erdma_ucq_info {