linux/drivers/infiniband/hw/hns/hns_roce_srq.c

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2018 Hisilicon Limited.
 */

#include <linux/pci.h>
#include <rdma/ib_umem.h>
#include "hns_roce_device.h"
#include "hns_roce_cmd.h"
#include "hns_roce_hem.h"

void hns_roce_srq_event(struct hns_roce_dev *hr_dev, u32 srqn, int event_type)
{
	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
	struct hns_roce_srq *srq;

	xa_lock(&srq_table->xa);
	srq = xa_load(&srq_table->xa, srqn & (hr_dev->caps.num_srqs - 1));
	if (srq)
		atomic_inc(&srq->refcount);
	xa_unlock(&srq_table->xa);

	if (!srq) {
		dev_warn(hr_dev->dev, "Async event for bogus SRQ %08x\n", srqn);
		return;
	}

	srq->event(srq, event_type);

	if (atomic_dec_and_test(&srq->refcount))
		complete(&srq->free);
}

static void hns_roce_ib_srq_event(struct hns_roce_srq *srq,
				  enum hns_roce_event event_type)
{
	struct hns_roce_dev *hr_dev = to_hr_dev(srq->ibsrq.device);
	struct ib_srq *ibsrq = &srq->ibsrq;
	struct ib_event event;

	if (ibsrq->event_handler) {
		event.device      = ibsrq->device;
		event.element.srq = ibsrq;
		switch (event_type) {
		case HNS_ROCE_EVENT_TYPE_SRQ_LIMIT_REACH:
			event.event = IB_EVENT_SRQ_LIMIT_REACHED;
			break;
		case HNS_ROCE_EVENT_TYPE_SRQ_CATAS_ERROR:
			event.event = IB_EVENT_SRQ_ERR;
			break;
		default:
			dev_err(hr_dev->dev,
			   "hns_roce:Unexpected event type 0x%x on SRQ %06lx\n",
			   event_type, srq->srqn);
			return;
		}

		ibsrq->event_handler(&event, ibsrq->srq_context);
	}
}

static int hns_roce_hw_create_srq(struct hns_roce_dev *dev,
				  struct hns_roce_cmd_mailbox *mailbox,
				  unsigned long srq_num)
{
	return hns_roce_cmd_mbox(dev, mailbox->dma, 0, srq_num, 0,
				 HNS_ROCE_CMD_CREATE_SRQ,
				 HNS_ROCE_CMD_TIMEOUT_MSECS);
}

static int hns_roce_hw_destroy_srq(struct hns_roce_dev *dev,
				   struct hns_roce_cmd_mailbox *mailbox,
				   unsigned long srq_num)
{
	return hns_roce_cmd_mbox(dev, 0, mailbox ? mailbox->dma : 0, srq_num,
				 mailbox ? 0 : 1, HNS_ROCE_CMD_DESTROY_SRQ,
				 HNS_ROCE_CMD_TIMEOUT_MSECS);
}

static int alloc_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
		      u32 pdn, u32 cqn, u16 xrcd, u64 db_rec_addr)
{
	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
	struct ib_device *ibdev = &hr_dev->ib_dev;
	struct hns_roce_cmd_mailbox *mailbox;
	u64 mtts_wqe[MTT_MIN_COUNT] = { 0 };
	u64 mtts_idx[MTT_MIN_COUNT] = { 0 };
	dma_addr_t dma_handle_wqe = 0;
	dma_addr_t dma_handle_idx = 0;
	int ret;

	/* Get the physical address of srq buf */
	ret = hns_roce_mtr_find(hr_dev, &srq->buf_mtr, 0, mtts_wqe,
				ARRAY_SIZE(mtts_wqe), &dma_handle_wqe);
	if (ret < 1) {
		ibdev_err(ibdev, "failed to find mtr for SRQ WQE, ret = %d.\n",
			  ret);
		return -ENOBUFS;
	}

	/* Get physical address of idx que buf */
	ret = hns_roce_mtr_find(hr_dev, &srq->idx_que.mtr, 0, mtts_idx,
				ARRAY_SIZE(mtts_idx), &dma_handle_idx);
	if (ret < 1) {
		ibdev_err(ibdev, "failed to find mtr for SRQ idx, ret = %d.\n",
			  ret);
		return -ENOBUFS;
	}

	ret = hns_roce_bitmap_alloc(&srq_table->bitmap, &srq->srqn);
	if (ret) {
		ibdev_err(ibdev,
			  "failed to alloc SRQ number, ret = %d.\n", ret);
		return -ENOMEM;
	}

	ret = hns_roce_table_get(hr_dev, &srq_table->table, srq->srqn);
	if (ret) {
		ibdev_err(ibdev, "failed to get SRQC table, ret = %d.\n", ret);
		goto err_out;
	}

	ret = xa_err(xa_store(&srq_table->xa, srq->srqn, srq, GFP_KERNEL));
	if (ret) {
		ibdev_err(ibdev, "failed to store SRQC, ret = %d.\n", ret);
		goto err_put;
	}

	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
	if (IS_ERR_OR_NULL(mailbox)) {
		ret = -ENOMEM;
		ibdev_err(ibdev, "failed to alloc mailbox for SRQC.\n");
		goto err_xa;
	}

	hr_dev->hw->write_srqc(hr_dev, srq, pdn, xrcd, cqn, mailbox->buf,
			       mtts_wqe, mtts_idx, dma_handle_wqe,
			       dma_handle_idx);

	ret = hns_roce_hw_create_srq(hr_dev, mailbox, srq->srqn);
	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
	if (ret) {
		ibdev_err(ibdev, "failed to config SRQC, ret = %d.\n", ret);
		goto err_xa;
	}

	atomic_set(&srq->refcount, 1);
	init_completion(&srq->free);
	return ret;

err_xa:
	xa_erase(&srq_table->xa, srq->srqn);

err_put:
	hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);

err_out:
	hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
	return ret;
}

static void free_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
{
	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
	int ret;

	ret = hns_roce_hw_destroy_srq(hr_dev, NULL, srq->srqn);
	if (ret)
		dev_err(hr_dev->dev, "DESTROY_SRQ failed (%d) for SRQN %06lx\n",
			ret, srq->srqn);

	xa_erase(&srq_table->xa, srq->srqn);

	if (atomic_dec_and_test(&srq->refcount))
		complete(&srq->free);
	wait_for_completion(&srq->free);

	hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
	hns_roce_bitmap_free(&srq_table->bitmap, srq->srqn, BITMAP_NO_RR);
}

static int alloc_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
			 struct ib_udata *udata, unsigned long addr)
{
	struct ib_device *ibdev = &hr_dev->ib_dev;
	struct hns_roce_buf_attr buf_attr = {};
	int err;

	srq->wqe_shift = ilog2(roundup_pow_of_two(max(HNS_ROCE_SGE_SIZE,
						      HNS_ROCE_SGE_SIZE *
						      srq->max_gs)));

	buf_attr.page_shift = hr_dev->caps.srqwqe_buf_pg_sz + HNS_HW_PAGE_SHIFT;
	buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
							 srq->wqe_shift);
	buf_attr.region[0].hopnum = hr_dev->caps.srqwqe_hop_num;
	buf_attr.region_count = 1;

	err = hns_roce_mtr_create(hr_dev, &srq->buf_mtr, &buf_attr,
				  hr_dev->caps.srqwqe_ba_pg_sz +
				  HNS_HW_PAGE_SHIFT, udata, addr);
	if (err)
		ibdev_err(ibdev,
			  "failed to alloc SRQ buf mtr, ret = %d.\n", err);

	return err;
}

static void free_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
{
	hns_roce_mtr_destroy(hr_dev, &srq->buf_mtr);
}

static int alloc_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
			 struct ib_udata *udata, unsigned long addr)
{
	struct hns_roce_idx_que *idx_que = &srq->idx_que;
	struct ib_device *ibdev = &hr_dev->ib_dev;
	struct hns_roce_buf_attr buf_attr = {};
	int err;

	srq->idx_que.entry_shift = ilog2(HNS_ROCE_IDX_QUE_ENTRY_SZ);

	buf_attr.page_shift = hr_dev->caps.idx_buf_pg_sz + HNS_HW_PAGE_SHIFT;
	buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
					srq->idx_que.entry_shift);
	buf_attr.region[0].hopnum = hr_dev->caps.idx_hop_num;
	buf_attr.region_count = 1;

	err = hns_roce_mtr_create(hr_dev, &idx_que->mtr, &buf_attr,
				  hr_dev->caps.idx_ba_pg_sz + HNS_HW_PAGE_SHIFT,
				  udata, addr);
	if (err) {
		ibdev_err(ibdev,
			  "failed to alloc SRQ idx mtr, ret = %d.\n", err);
		return err;
	}

	if (!udata) {
		idx_que->bitmap = bitmap_zalloc(srq->wqe_cnt, GFP_KERNEL);
		if (!idx_que->bitmap) {
			ibdev_err(ibdev, "failed to alloc SRQ idx bitmap.\n");
			err = -ENOMEM;
			goto err_idx_mtr;
		}
	}

	idx_que->head = 0;
	idx_que->tail = 0;

	return 0;
err_idx_mtr:
	hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);

	return err;
}

static void free_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
{
	struct hns_roce_idx_que *idx_que = &srq->idx_que;

	bitmap_free(idx_que->bitmap);
	idx_que->bitmap = NULL;
	hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
}

static int alloc_srq_wrid(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
{
	srq->wrid = kvmalloc_array(srq->wqe_cnt, sizeof(u64), GFP_KERNEL);
	if (!srq->wrid)
		return -ENOMEM;

	return 0;
}

static void free_srq_wrid(struct hns_roce_srq *srq)
{
	kfree(srq->wrid);
	srq->wrid = NULL;
}

static u32 proc_srq_sge(struct hns_roce_dev *dev, struct hns_roce_srq *hr_srq,
			bool user)
{
	u32 max_sge = dev->caps.max_srq_sges;

	if (dev->pci_dev->revision >= PCI_REVISION_ID_HIP09)
		return max_sge;

	/* Reserve SGEs only for HIP08 in kernel; The userspace driver will
	 * calculate number of max_sge with reserved SGEs when allocating wqe
	 * buf, so there is no need to do this again in kernel. But the number
	 * may exceed the capacity of SGEs recorded in the firmware, so the
	 * kernel driver should just adapt the value accordingly.
	 */
	if (user)
		max_sge = roundup_pow_of_two(max_sge + 1);
	else
		hr_srq->rsv_sge = 1;

	return max_sge;
}

int hns_roce_create_srq(struct ib_srq *ib_srq,
			struct ib_srq_init_attr *init_attr,
			struct ib_udata *udata)
{
	struct hns_roce_dev *hr_dev = to_hr_dev(ib_srq->device);
	struct hns_roce_ib_create_srq_resp resp = {};
	struct hns_roce_srq *srq = to_hr_srq(ib_srq);
	struct ib_device *ibdev = &hr_dev->ib_dev;
	struct hns_roce_ib_create_srq ucmd = {};
	u32 max_sge;
	int ret;
	u32 cqn;

	if (init_attr->srq_type != IB_SRQT_BASIC &&
	    init_attr->srq_type != IB_SRQT_XRC)
		return -EOPNOTSUPP;

	max_sge = proc_srq_sge(hr_dev, srq, !!udata);

	if (init_attr->attr.max_wr >= hr_dev->caps.max_srq_wrs ||
	    init_attr->attr.max_sge > max_sge) {
		ibdev_err(&hr_dev->ib_dev,
			  "SRQ config error, depth = %u, sge = %d\n",
			  init_attr->attr.max_wr, init_attr->attr.max_sge);
		return -EINVAL;
	}

	mutex_init(&srq->mutex);
	spin_lock_init(&srq->lock);

	srq->wqe_cnt = roundup_pow_of_two(init_attr->attr.max_wr + 1);
	srq->max_gs =
		roundup_pow_of_two(init_attr->attr.max_sge + srq->rsv_sge);
	init_attr->attr.max_wr = srq->wqe_cnt;
	init_attr->attr.max_sge = srq->max_gs;

	if (udata) {
		ret = ib_copy_from_udata(&ucmd, udata,
					 min(udata->inlen, sizeof(ucmd)));
		if (ret) {
			ibdev_err(ibdev, "failed to copy SRQ udata, ret = %d.\n",
				  ret);
			return ret;
		}
	}

	ret = alloc_srq_buf(hr_dev, srq, udata, ucmd.buf_addr);
	if (ret) {
		ibdev_err(ibdev,
			  "failed to alloc SRQ buffer, ret = %d.\n", ret);
		return ret;
	}

	ret = alloc_srq_idx(hr_dev, srq, udata, ucmd.que_addr);
	if (ret) {
		ibdev_err(ibdev, "failed to alloc SRQ idx, ret = %d.\n", ret);
		goto err_buf_alloc;
	}

	if (!udata) {
		ret = alloc_srq_wrid(hr_dev, srq);
		if (ret) {
			ibdev_err(ibdev, "failed to alloc SRQ wrid, ret = %d.\n",
				  ret);
			goto err_idx_alloc;
		}
	}

	cqn = ib_srq_has_cq(init_attr->srq_type) ?
	      to_hr_cq(init_attr->ext.cq)->cqn : 0;
	srq->db_reg_l = hr_dev->reg_base + SRQ_DB_REG;

	ret = alloc_srqc(hr_dev, srq, to_hr_pd(ib_srq->pd)->pdn, cqn, 0, 0);
	if (ret) {
		ibdev_err(ibdev,
			  "failed to alloc SRQ context, ret = %d.\n", ret);
		goto err_wrid_alloc;
	}

	srq->event = hns_roce_ib_srq_event;
	resp.srqn = srq->srqn;
	srq->max_gs = init_attr->attr.max_sge;
	init_attr->attr.max_sge = srq->max_gs - srq->rsv_sge;

	if (udata) {
		ret = ib_copy_to_udata(udata, &resp,
				       min(udata->outlen, sizeof(resp)));
		if (ret)
			goto err_srqc_alloc;
	}

	return 0;

err_srqc_alloc:
	free_srqc(hr_dev, srq);
err_wrid_alloc:
	free_srq_wrid(srq);
err_idx_alloc:
	free_srq_idx(hr_dev, srq);
err_buf_alloc:
	free_srq_buf(hr_dev, srq);
	return ret;
}

int hns_roce_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
{
	struct hns_roce_dev *hr_dev = to_hr_dev(ibsrq->device);
	struct hns_roce_srq *srq = to_hr_srq(ibsrq);

	free_srqc(hr_dev, srq);
	free_srq_idx(hr_dev, srq);
	free_srq_wrid(srq);
	free_srq_buf(hr_dev, srq);
	return 0;
}

int hns_roce_init_srq_table(struct hns_roce_dev *hr_dev)
{
	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;

	xa_init(&srq_table->xa);

	return hns_roce_bitmap_init(&srq_table->bitmap, hr_dev->caps.num_srqs,
				    hr_dev->caps.num_srqs - 1,
				    hr_dev->caps.reserved_srqs, 0);
}

void hns_roce_cleanup_srq_table(struct hns_roce_dev *hr_dev)
{
	hns_roce_bitmap_cleanup(&hr_dev->srq_table.bitmap);
}