Commit 55da2b5f authored by Chengchang Tang's avatar Chengchang Tang Committed by Juan Zhou
Browse files

RDMA/hns: Support adaptive PBL hopnum 

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I91AFK
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2eb999b3d40ff825121784ec38dd5ab0abb7b606



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

In the current implementation, a fixed addressing level is used for
PBL. But in fact, the necessary addressing level is related to page
size and the size of MR.

This patch calculates the addressing level according to page size
and the size of MR, and uses the addressing level to configure the
PBL.

Signed-off-by: default avatarChengchang Tang <tangchengchang@huawei.com>
Signed-off-by: default avatarJunxian Huang <huangjunxian6@hisilicon.com>
Link: https://lore.kernel.org/r/20240113085935.2838701-6-huangjunxian6@hisilicon.com


Signed-off-by: default avatarLeon Romanovsky <leon@kernel.org>
Signed-off-by: default avatarJuan Zhou <zhoujuan51@h-partners.com>
parent 305936fd

drivers/infiniband/hw/hns/hns_roce_mr.c

+54 −3
Original line number Diff line number Diff line
@@ -112,10 +112,13 @@ static int alloc_mr_pbl(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr, 
	err = hns_roce_mtr_create(hr_dev, &mr->pbl_mtr, &buf_attr,

				  hr_dev->caps.pbl_ba_pg_sz + PAGE_SHIFT,

				  udata, start);

	if (err)

	if (err) {

		ibdev_err(ibdev, "failed to alloc pbl mtr, ret = %d.\n", err);

	else

		return err;

	}



	mr->npages = mr->pbl_mtr.hem_cfg.buf_pg_count;

	mr->pbl_hop_num = buf_attr.region[0].hopnum;



	return err;

}
@@ -943,6 +946,50 @@ static int get_best_page_shift(struct hns_roce_dev *hr_dev, 
	return 0;

}



static int get_best_hop_num(struct hns_roce_dev *hr_dev,

			    struct hns_roce_mtr *mtr,

			    struct hns_roce_buf_attr *buf_attr,

			    unsigned int ba_pg_shift)

{

#define INVALID_HOPNUM -1

#define MIN_BA_CNT 1

	size_t buf_pg_sz = 1 << buf_attr->page_shift;

	struct ib_device *ibdev = &hr_dev->ib_dev;

	size_t ba_pg_sz = 1 << ba_pg_shift;

	int hop_num = INVALID_HOPNUM;

	size_t unit = MIN_BA_CNT;

	size_t ba_cnt;

	int j;



	if (!buf_attr->adaptive || buf_attr->type != MTR_PBL)

		return 0;



	/* Caculating the number of buf pages, each buf page need a BA */

	if (mtr->umem)

		ba_cnt = ib_umem_num_dma_blocks(mtr->umem, buf_pg_sz);

	else

		ba_cnt = DIV_ROUND_UP(buf_attr->region[0].size, buf_pg_sz);



	for (j = 0; j <= HNS_ROCE_MAX_HOP_NUM; j++) {

		if (ba_cnt <= unit) {

			hop_num = j;

			break;

		}

		/* Number of BAs can be represented at per hop */

		unit *= ba_pg_sz / BA_BYTE_LEN;

	}



	if (hop_num < 0) {

		ibdev_err(ibdev,

			  "failed to calculate a valid hopnum.\n");

		return -EINVAL;

	}



	buf_attr->region[0].hopnum = hop_num;



	return 0;

}



static bool is_buf_attr_valid(struct hns_roce_dev *hr_dev,

			      struct hns_roce_buf_attr *attr)

{
@@ -1116,6 +1163,10 @@ int hns_roce_mtr_create(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr, 
		ret = get_best_page_shift(hr_dev, mtr, buf_attr);

		if (ret)

			goto err_init_buf;



		ret = get_best_hop_num(hr_dev, mtr, buf_attr, ba_page_shift);

		if (ret)

			goto err_init_buf;

	}



	ret = mtr_init_buf_cfg(hr_dev, mtr, buf_attr);