linux/drivers/infiniband/hw/mlx5/umr.c

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. */

#include "mlx5_ib.h"
#include "umr.h"

static __be64 get_umr_enable_mr_mask(void)
{
	u64 result;

	result = MLX5_MKEY_MASK_KEY |
		 MLX5_MKEY_MASK_FREE;

	return cpu_to_be64(result);
}

static __be64 get_umr_disable_mr_mask(void)
{
	u64 result;

	result = MLX5_MKEY_MASK_FREE;

	return cpu_to_be64(result);
}

static __be64 get_umr_update_translation_mask(void)
{
	u64 result;

	result = MLX5_MKEY_MASK_LEN |
		 MLX5_MKEY_MASK_PAGE_SIZE |
		 MLX5_MKEY_MASK_START_ADDR;

	return cpu_to_be64(result);
}

static __be64 get_umr_update_access_mask(struct mlx5_ib_dev *dev)
{
	u64 result;

	result = MLX5_MKEY_MASK_LR |
		 MLX5_MKEY_MASK_LW |
		 MLX5_MKEY_MASK_RR |
		 MLX5_MKEY_MASK_RW;

	if (MLX5_CAP_GEN(dev->mdev, atomic))
		result |= MLX5_MKEY_MASK_A;

	if (MLX5_CAP_GEN(dev->mdev, relaxed_ordering_write_umr))
		result |= MLX5_MKEY_MASK_RELAXED_ORDERING_WRITE;

	if (MLX5_CAP_GEN(dev->mdev, relaxed_ordering_read_umr))
		result |= MLX5_MKEY_MASK_RELAXED_ORDERING_READ;

	return cpu_to_be64(result);
}

static __be64 get_umr_update_pd_mask(void)
{
	u64 result;

	result = MLX5_MKEY_MASK_PD;

	return cpu_to_be64(result);
}

static int umr_check_mkey_mask(struct mlx5_ib_dev *dev, u64 mask)
{
	if (mask & MLX5_MKEY_MASK_PAGE_SIZE &&
	    MLX5_CAP_GEN(dev->mdev, umr_modify_entity_size_disabled))
		return -EPERM;

	if (mask & MLX5_MKEY_MASK_A &&
	    MLX5_CAP_GEN(dev->mdev, umr_modify_atomic_disabled))
		return -EPERM;

	if (mask & MLX5_MKEY_MASK_RELAXED_ORDERING_WRITE &&
	    !MLX5_CAP_GEN(dev->mdev, relaxed_ordering_write_umr))
		return -EPERM;

	if (mask & MLX5_MKEY_MASK_RELAXED_ORDERING_READ &&
	    !MLX5_CAP_GEN(dev->mdev, relaxed_ordering_read_umr))
		return -EPERM;

	return 0;
}

int mlx5r_umr_set_umr_ctrl_seg(struct mlx5_ib_dev *dev,
			       struct mlx5_wqe_umr_ctrl_seg *umr,
			       const struct ib_send_wr *wr)
{
	const struct mlx5_umr_wr *umrwr = umr_wr(wr);

	memset(umr, 0, sizeof(*umr));

	if (!umrwr->ignore_free_state) {
		if (wr->send_flags & MLX5_IB_SEND_UMR_FAIL_IF_FREE)
			 /* fail if free */
			umr->flags = MLX5_UMR_CHECK_FREE;
		else
			/* fail if not free */
			umr->flags = MLX5_UMR_CHECK_NOT_FREE;
	}

	umr->xlt_octowords =
		cpu_to_be16(mlx5r_umr_get_xlt_octo(umrwr->xlt_size));
	if (wr->send_flags & MLX5_IB_SEND_UMR_UPDATE_XLT) {
		u64 offset = mlx5r_umr_get_xlt_octo(umrwr->offset);

		umr->xlt_offset = cpu_to_be16(offset & 0xffff);
		umr->xlt_offset_47_16 = cpu_to_be32(offset >> 16);
		umr->flags |= MLX5_UMR_TRANSLATION_OFFSET_EN;
	}
	if (wr->send_flags & MLX5_IB_SEND_UMR_UPDATE_TRANSLATION)
		umr->mkey_mask |= get_umr_update_translation_mask();
	if (wr->send_flags & MLX5_IB_SEND_UMR_UPDATE_PD_ACCESS) {
		umr->mkey_mask |= get_umr_update_access_mask(dev);
		umr->mkey_mask |= get_umr_update_pd_mask();
	}
	if (wr->send_flags & MLX5_IB_SEND_UMR_ENABLE_MR)
		umr->mkey_mask |= get_umr_enable_mr_mask();
	if (wr->send_flags & MLX5_IB_SEND_UMR_DISABLE_MR)
		umr->mkey_mask |= get_umr_disable_mr_mask();

	if (!wr->num_sge)
		umr->flags |= MLX5_UMR_INLINE;

	return umr_check_mkey_mask(dev, be64_to_cpu(umr->mkey_mask));
}

enum {
	MAX_UMR_WR = 128,
};

static int mlx5r_umr_qp_rst2rts(struct mlx5_ib_dev *dev, struct ib_qp *qp)
{
	struct ib_qp_attr attr = {};
	int ret;

	attr.qp_state = IB_QPS_INIT;
	attr.port_num = 1;
	ret = ib_modify_qp(qp, &attr,
			   IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT);
	if (ret) {
		mlx5_ib_dbg(dev, "Couldn't modify UMR QP\n");
		return ret;
	}

	memset(&attr, 0, sizeof(attr));
	attr.qp_state = IB_QPS_RTR;

	ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
	if (ret) {
		mlx5_ib_dbg(dev, "Couldn't modify umr QP to rtr\n");
		return ret;
	}

	memset(&attr, 0, sizeof(attr));
	attr.qp_state = IB_QPS_RTS;
	ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
	if (ret) {
		mlx5_ib_dbg(dev, "Couldn't modify umr QP to rts\n");
		return ret;
	}

	return 0;
}

int mlx5r_umr_resource_init(struct mlx5_ib_dev *dev)
{
	struct ib_qp_init_attr init_attr = {};
	struct ib_pd *pd;
	struct ib_cq *cq;
	struct ib_qp *qp;
	int ret;

	pd = ib_alloc_pd(&dev->ib_dev, 0);
	if (IS_ERR(pd)) {
		mlx5_ib_dbg(dev, "Couldn't create PD for sync UMR QP\n");
		return PTR_ERR(pd);
	}

	cq = ib_alloc_cq(&dev->ib_dev, NULL, 128, 0, IB_POLL_SOFTIRQ);
	if (IS_ERR(cq)) {
		mlx5_ib_dbg(dev, "Couldn't create CQ for sync UMR QP\n");
		ret = PTR_ERR(cq);
		goto destroy_pd;
	}

	init_attr.send_cq = cq;
	init_attr.recv_cq = cq;
	init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
	init_attr.cap.max_send_wr = MAX_UMR_WR;
	init_attr.cap.max_send_sge = 1;
	init_attr.qp_type = MLX5_IB_QPT_REG_UMR;
	init_attr.port_num = 1;
	qp = ib_create_qp(pd, &init_attr);
	if (IS_ERR(qp)) {
		mlx5_ib_dbg(dev, "Couldn't create sync UMR QP\n");
		ret = PTR_ERR(qp);
		goto destroy_cq;
	}

	ret = mlx5r_umr_qp_rst2rts(dev, qp);
	if (ret)
		goto destroy_qp;

	dev->umrc.qp = qp;
	dev->umrc.cq = cq;
	dev->umrc.pd = pd;

	sema_init(&dev->umrc.sem, MAX_UMR_WR);

	return 0;

destroy_qp:
	ib_destroy_qp(qp);
destroy_cq:
	ib_free_cq(cq);
destroy_pd:
	ib_dealloc_pd(pd);
	return ret;
}

void mlx5r_umr_resource_cleanup(struct mlx5_ib_dev *dev)
{
	ib_destroy_qp(dev->umrc.qp);
	ib_free_cq(dev->umrc.cq);
	ib_dealloc_pd(dev->umrc.pd);
}