RDMA/hns: Optimize the MR registration process

When creating or re-registering an MR, storing the PDN, access flag and
IOVA information ASAP can simplify the number of parameters passed into
the subsequent process.

Link: https://lore.kernel.org/r/1611395282-991-3-git-send-email-liweihang@huawei.com
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Lang Cheng <chenglang@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 38 insertions, 72 deletions

diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
index 45ceeab16a1a..5a2a557c37b8 100644
--- a/drivers/infiniband/hw/hns/hns_roce_mr.c
+++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
@@ -66,8 +66,7 @@ int hns_roce_hw_destroy_mpt(struct hns_roce_dev *hr_dev,
 				 HNS_ROCE_CMD_TIMEOUT_MSECS);
 }
 
-static int alloc_mr_key(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr,
-			u32 pd, u64 iova, u64 size, u32 access)
+static int alloc_mr_key(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr)
 {
 	struct ib_device *ibdev = &hr_dev->ib_dev;
 	unsigned long obj = 0;
@@ -82,11 +81,6 @@ static int alloc_mr_key(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr,
 		return -ENOMEM;
 	}
 
-	mr->iova = iova;			/* MR va starting addr */
-	mr->size = size;			/* MR addr range */
-	mr->pd = pd;				/* MR num */
-	mr->access = access;			/* MR access permit */
-	mr->enabled = 0;			/* MR active status */
 	mr->key = hw_index_to_key(obj);		/* MR key */
 
 	err = hns_roce_table_get(hr_dev, &hr_dev->mr_table.mtpt_table, obj);
@@ -110,8 +104,7 @@ static void free_mr_key(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr)
 }
 
 static int alloc_mr_pbl(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr,
-			size_t length, struct ib_udata *udata, u64 start,
-			int access)
+			struct ib_udata *udata, u64 start)
 {
 	struct ib_device *ibdev = &hr_dev->ib_dev;
 	bool is_fast = mr->type == MR_TYPE_FRMR;
@@ -121,10 +114,10 @@ static int alloc_mr_pbl(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr,
 	mr->pbl_hop_num = is_fast ? 1 : hr_dev->caps.pbl_hop_num;
 	buf_attr.page_shift = is_fast ? PAGE_SHIFT :
 			      hr_dev->caps.pbl_buf_pg_sz + PAGE_SHIFT;
-	buf_attr.region[0].size = length;
+	buf_attr.region[0].size = mr->size;
 	buf_attr.region[0].hopnum = mr->pbl_hop_num;
 	buf_attr.region_count = 1;
-	buf_attr.user_access = access;
+	buf_attr.user_access = mr->access;
 	/* fast MR's buffer is alloced before mapping, not at creation */
 	buf_attr.mtt_only = is_fast;
 
@@ -196,9 +189,6 @@ static int hns_roce_mr_enable(struct hns_roce_dev *hr_dev,
 	}
 
 	mr->enabled = 1;
-	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
-
-	return 0;
 
 err_page:
 	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
@@ -236,14 +226,16 @@ struct ib_mr *hns_roce_get_dma_mr(struct ib_pd *pd, int acc)
 		return  ERR_PTR(-ENOMEM);
 
 	mr->type = MR_TYPE_DMA;
+	mr->pd = to_hr_pd(pd)->pdn;
+	mr->access = acc;
 
 	/* Allocate memory region key */
 	hns_roce_hem_list_init(&mr->pbl_mtr.hem_list);
-	ret = alloc_mr_key(hr_dev, mr, to_hr_pd(pd)->pdn, 0, 0, acc);
+	ret = alloc_mr_key(hr_dev, mr);
 	if (ret)
 		goto err_free;
 
-	ret = hns_roce_mr_enable(to_hr_dev(pd->device), mr);
+	ret = hns_roce_mr_enable(hr_dev, mr);
 	if (ret)
 		goto err_mr;
 
@@ -270,13 +262,17 @@ struct ib_mr *hns_roce_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 	if (!mr)
 		return ERR_PTR(-ENOMEM);
 
+	mr->iova = virt_addr;
+	mr->size = length;
+	mr->pd = to_hr_pd(pd)->pdn;
+	mr->access = access_flags;
 	mr->type = MR_TYPE_MR;
-	ret = alloc_mr_key(hr_dev, mr, to_hr_pd(pd)->pdn, virt_addr, length,
-			   access_flags);
+
+	ret = alloc_mr_key(hr_dev, mr);
 	if (ret)
 		goto err_alloc_mr;
 
-	ret = alloc_mr_pbl(hr_dev, mr, length, udata, start, access_flags);
+	ret = alloc_mr_pbl(hr_dev, mr, udata, start);
 	if (ret)
 		goto err_alloc_key;
 
@@ -298,35 +294,6 @@ err_alloc_mr:
 	return ERR_PTR(ret);
 }
 
-static int rereg_mr_trans(struct ib_mr *ibmr, int flags,
-			  u64 start, u64 length,
-			  u64 virt_addr, int mr_access_flags,
-			  struct hns_roce_cmd_mailbox *mailbox,
-			  u32 pdn, struct ib_udata *udata)
-{
-	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
-	struct ib_device *ibdev = &hr_dev->ib_dev;
-	struct hns_roce_mr *mr = to_hr_mr(ibmr);
-	int ret;
-
-	free_mr_pbl(hr_dev, mr);
-	ret = alloc_mr_pbl(hr_dev, mr, length, udata, start, mr_access_flags);
-	if (ret) {
-		ibdev_err(ibdev, "failed to create mr PBL, ret = %d.\n", ret);
-		return ret;
-	}
-
-	ret = hr_dev->hw->rereg_write_mtpt(hr_dev, mr, flags, pdn,
-					   mr_access_flags, virt_addr,
-					   length, mailbox->buf);
-	if (ret) {
-		ibdev_err(ibdev, "failed to write mtpt, ret = %d.\n", ret);
-		free_mr_pbl(hr_dev, mr);
-	}
-
-	return ret;
-}
-
 struct ib_mr *hns_roce_rereg_user_mr(struct ib_mr *ibmr, int flags, u64 start,
 				     u64 length, u64 virt_addr,
 				     int mr_access_flags, struct ib_pd *pd,
@@ -337,7 +304,6 @@ struct ib_mr *hns_roce_rereg_user_mr(struct ib_mr *ibmr, int flags, u64 start,
 	struct hns_roce_mr *mr = to_hr_mr(ibmr);
 	struct hns_roce_cmd_mailbox *mailbox;
 	unsigned long mtpt_idx;
-	u32 pdn = 0;
 	int ret;
 
 	if (!mr->enabled)
@@ -359,23 +325,29 @@ struct ib_mr *hns_roce_rereg_user_mr(struct ib_mr *ibmr, int flags, u64 start,
 		ibdev_warn(ib_dev, "failed to destroy MPT, ret = %d.\n", ret);
 
 	mr->enabled = 0;
+	mr->iova = virt_addr;
+	mr->size = length;
 
 	if (flags & IB_MR_REREG_PD)
-		pdn = to_hr_pd(pd)->pdn;
+		mr->pd = to_hr_pd(pd)->pdn;
+
+	if (flags & IB_MR_REREG_ACCESS)
+		mr->access = mr_access_flags;
 
 	if (flags & IB_MR_REREG_TRANS) {
-		ret = rereg_mr_trans(ibmr, flags,
-				     start, length,
-				     virt_addr, mr_access_flags,
-				     mailbox, pdn, udata);
-		if (ret)
-			goto free_cmd_mbox;
-	} else {
-		ret = hr_dev->hw->rereg_write_mtpt(hr_dev, mr, flags, pdn,
-						   mr_access_flags, virt_addr,
-						   length, mailbox->buf);
-		if (ret)
+		free_mr_pbl(hr_dev, mr);
+		ret = alloc_mr_pbl(hr_dev, mr, udata, start);
+		if (ret) {
+			ibdev_err(ib_dev, "failed to alloc mr PBL, ret = %d.\n",
+				  ret);
 			goto free_cmd_mbox;
+		}
+	}
+
+	ret = hr_dev->hw->rereg_write_mtpt(hr_dev, mr, flags, mailbox->buf);
+	if (ret) {
+		ibdev_err(ib_dev, "failed to write mtpt, ret = %d.\n", ret);
+		goto free_cmd_mbox;
 	}
 
 	ret = hns_roce_hw_create_mpt(hr_dev, mailbox, mtpt_idx);
@@ -385,12 +357,6 @@ struct ib_mr *hns_roce_rereg_user_mr(struct ib_mr *ibmr, int flags, u64 start,
 	}
 
 	mr->enabled = 1;
-	if (flags & IB_MR_REREG_ACCESS)
-		mr->access = mr_access_flags;
-
-	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
-
-	return NULL;
 
 free_cmd_mbox:
 	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
@@ -420,7 +386,6 @@ struct ib_mr *hns_roce_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
 	struct hns_roce_dev *hr_dev = to_hr_dev(pd->device);
 	struct device *dev = hr_dev->dev;
 	struct hns_roce_mr *mr;
-	u64 length;
 	int ret;
 
 	if (mr_type != IB_MR_TYPE_MEM_REG)
@@ -437,14 +402,15 @@ struct ib_mr *hns_roce_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
 		return ERR_PTR(-ENOMEM);
 
 	mr->type = MR_TYPE_FRMR;
+	mr->pd = to_hr_pd(pd)->pdn;
+	mr->size = max_num_sg * (1 << PAGE_SHIFT);
 
 	/* Allocate memory region key */
-	length = max_num_sg * (1 << PAGE_SHIFT);
-	ret = alloc_mr_key(hr_dev, mr, to_hr_pd(pd)->pdn, 0, length, 0);
+	ret = alloc_mr_key(hr_dev, mr);
 	if (ret)
 		goto err_free;
 
-	ret = alloc_mr_pbl(hr_dev, mr, length, NULL, 0, 0);
+	ret = alloc_mr_pbl(hr_dev, mr, NULL, 0);
 	if (ret)
 		goto err_key;
 
@@ -453,7 +419,7 @@ struct ib_mr *hns_roce_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
 		goto err_pbl;
 
 	mr->ibmr.rkey = mr->ibmr.lkey = mr->key;
-	mr->ibmr.length = length;
+	mr->ibmr.length = mr->size;
 
 	return &mr->ibmr;