RDMA/hns: Add FRMR support for hip08

This patch adds fast register physical memory region (FRMR) support for
hip08.

Signed-off-by: Yixian Liu <liuyixian@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 84 insertions, 8 deletions

diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
index 0613c117a442..521ad2aa3a4e 100644
--- a/drivers/infiniband/hw/hns/hns_roce_mr.c
+++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
@@ -329,7 +329,7 @@ static int hns_roce_mhop_alloc(struct hns_roce_dev *hr_dev, int npages,
 	u64 bt_idx;
 	u64 size;
 
-	mhop_num = hr_dev->caps.pbl_hop_num;
+	mhop_num = (mr->type == MR_TYPE_FRMR ? 1 : hr_dev->caps.pbl_hop_num);
 	pbl_bt_sz = 1 << (hr_dev->caps.pbl_ba_pg_sz + PAGE_SHIFT);
 	pbl_last_bt_num = (npages + pbl_bt_sz / 8 - 1) / (pbl_bt_sz / 8);
 
@@ -351,7 +351,7 @@ static int hns_roce_mhop_alloc(struct hns_roce_dev *hr_dev, int npages,
 
 		mr->pbl_size = npages;
 		mr->pbl_ba = mr->pbl_dma_addr;
-		mr->pbl_hop_num = hr_dev->caps.pbl_hop_num;
+		mr->pbl_hop_num = mhop_num;
 		mr->pbl_ba_pg_sz = hr_dev->caps.pbl_ba_pg_sz;
 		mr->pbl_buf_pg_sz = hr_dev->caps.pbl_buf_pg_sz;
 		return 0;
@@ -511,7 +511,6 @@ static int hns_roce_mr_alloc(struct hns_roce_dev *hr_dev, u32 pd, u64 iova,
 	mr->key = hw_index_to_key(index);	/* MR key */
 
 	if (size == ~0ull) {
-		mr->type = MR_TYPE_DMA;
 		mr->pbl_buf = NULL;
 		mr->pbl_dma_addr = 0;
 		/* PBL multi-hop addressing parameters */
@@ -522,7 +521,6 @@ static int hns_roce_mr_alloc(struct hns_roce_dev *hr_dev, u32 pd, u64 iova,
 		mr->pbl_l1_dma_addr = NULL;
 		mr->pbl_l0_dma_addr = 0;
 	} else {
-		mr->type = MR_TYPE_MR;
 		if (!hr_dev->caps.pbl_hop_num) {
 			mr->pbl_buf = dma_alloc_coherent(dev, npages * 8,
 							 &(mr->pbl_dma_addr),
@@ -548,9 +546,9 @@ static void hns_roce_mhop_free(struct hns_roce_dev *hr_dev,
 	u32 mhop_num;
 	u64 bt_idx;
 
-	npages = ib_umem_page_count(mr->umem);
+	npages = mr->pbl_size;
 	pbl_bt_sz = 1 << (hr_dev->caps.pbl_ba_pg_sz + PAGE_SHIFT);
-	mhop_num = hr_dev->caps.pbl_hop_num;
+	mhop_num = (mr->type == MR_TYPE_FRMR) ? 1 : hr_dev->caps.pbl_hop_num;
 
 	if (mhop_num == HNS_ROCE_HOP_NUM_0)
 		return;
@@ -636,7 +634,8 @@ static void hns_roce_mr_free(struct hns_roce_dev *hr_dev,
 	}
 
 	if (mr->size != ~0ULL) {
-		npages = ib_umem_page_count(mr->umem);
+		if (mr->type == MR_TYPE_MR)
+			npages = ib_umem_page_count(mr->umem);
 
 		if (!hr_dev->caps.pbl_hop_num)
 			dma_free_coherent(dev, (unsigned int)(npages * 8),
@@ -674,7 +673,10 @@ static int hns_roce_mr_enable(struct hns_roce_dev *hr_dev,
 		goto err_table;
 	}
 
-	ret = hr_dev->hw->write_mtpt(mailbox->buf, mr, mtpt_idx);
+	if (mr->type != MR_TYPE_FRMR)
+		ret = hr_dev->hw->write_mtpt(mailbox->buf, mr, mtpt_idx);
+	else
+		ret = hr_dev->hw->frmr_write_mtpt(mailbox->buf, mr);
 	if (ret) {
 		dev_err(dev, "Write mtpt fail!\n");
 		goto err_page;
@@ -855,6 +857,8 @@ struct ib_mr *hns_roce_get_dma_mr(struct ib_pd *pd, int acc)
 	if (mr == NULL)
 		return  ERR_PTR(-ENOMEM);
 
+	mr->type = MR_TYPE_DMA;
+
 	/* Allocate memory region key */
 	ret = hns_roce_mr_alloc(to_hr_dev(pd->device), to_hr_pd(pd)->pdn, 0,
 				~0ULL, acc, 0, mr);
@@ -1031,6 +1035,8 @@ struct ib_mr *hns_roce_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 		}
 	}
 
+	mr->type = MR_TYPE_MR;
+
 	ret = hns_roce_mr_alloc(hr_dev, to_hr_pd(pd)->pdn, virt_addr, length,
 				access_flags, n, mr);
 	if (ret)
@@ -1202,6 +1208,76 @@ int hns_roce_dereg_mr(struct ib_mr *ibmr)
 	return ret;
 }
 
+struct ib_mr *hns_roce_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
+				u32 max_num_sg)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(pd->device);
+	struct device *dev = hr_dev->dev;
+	struct hns_roce_mr *mr;
+	u64 length;
+	u32 page_size;
+	int ret;
+
+	page_size = 1 << (hr_dev->caps.pbl_buf_pg_sz + PAGE_SHIFT);
+	length = max_num_sg * page_size;
+
+	if (mr_type != IB_MR_TYPE_MEM_REG)
+		return ERR_PTR(-EINVAL);
+
+	if (max_num_sg > HNS_ROCE_FRMR_MAX_PA) {
+		dev_err(dev, "max_num_sg larger than %d\n",
+			HNS_ROCE_FRMR_MAX_PA);
+		return ERR_PTR(-EINVAL);
+	}
+
+	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+	if (!mr)
+		return ERR_PTR(-ENOMEM);
+
+	mr->type = MR_TYPE_FRMR;
+
+	/* Allocate memory region key */
+	ret = hns_roce_mr_alloc(hr_dev, to_hr_pd(pd)->pdn, 0, length,
+				0, max_num_sg, mr);
+	if (ret)
+		goto err_free;
+
+	ret = hns_roce_mr_enable(hr_dev, mr);
+	if (ret)
+		goto err_mr;
+
+	mr->ibmr.rkey = mr->ibmr.lkey = mr->key;
+	mr->umem = NULL;
+
+	return &mr->ibmr;
+
+err_mr:
+	hns_roce_mr_free(to_hr_dev(pd->device), mr);
+
+err_free:
+	kfree(mr);
+	return ERR_PTR(ret);
+}
+
+static int hns_roce_set_page(struct ib_mr *ibmr, u64 addr)
+{
+	struct hns_roce_mr *mr = to_hr_mr(ibmr);
+
+	mr->pbl_buf[mr->npages++] = cpu_to_le64(addr);
+
+	return 0;
+}
+
+int hns_roce_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
+		       unsigned int *sg_offset)
+{
+	struct hns_roce_mr *mr = to_hr_mr(ibmr);
+
+	mr->npages = 0;
+
+	return ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, hns_roce_set_page);
+}
+
 static void hns_roce_mw_free(struct hns_roce_dev *hr_dev,
 			     struct hns_roce_mw *mw)
 {