1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2022, Microsoft Corporation. All rights reserved.
  4 */
  5
  6#include "mana_ib.h"
  7
  8#define VALID_MR_FLAGS                                                         \
  9	(IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ)
 10
 11static enum gdma_mr_access_flags
 12mana_ib_verbs_to_gdma_access_flags(int access_flags)
 13{
 14	enum gdma_mr_access_flags flags = GDMA_ACCESS_FLAG_LOCAL_READ;
 15
 16	if (access_flags & IB_ACCESS_LOCAL_WRITE)
 17		flags |= GDMA_ACCESS_FLAG_LOCAL_WRITE;
 18
 19	if (access_flags & IB_ACCESS_REMOTE_WRITE)
 20		flags |= GDMA_ACCESS_FLAG_REMOTE_WRITE;
 21
 22	if (access_flags & IB_ACCESS_REMOTE_READ)
 23		flags |= GDMA_ACCESS_FLAG_REMOTE_READ;
 24
 25	return flags;
 26}
 27
 28static int mana_ib_gd_create_mr(struct mana_ib_dev *dev, struct mana_ib_mr *mr,
 29				struct gdma_create_mr_params *mr_params)
 30{
 31	struct gdma_create_mr_response resp = {};
 32	struct gdma_create_mr_request req = {};
 33	struct gdma_context *gc = mdev_to_gc(dev);
 34	int err;
 35
 36	mana_gd_init_req_hdr(&req.hdr, GDMA_CREATE_MR, sizeof(req),
 37			     sizeof(resp));
 38	req.pd_handle = mr_params->pd_handle;
 39	req.mr_type = mr_params->mr_type;
 40
 41	switch (mr_params->mr_type) {
 42	case GDMA_MR_TYPE_GVA:
 43		req.gva.dma_region_handle = mr_params->gva.dma_region_handle;
 44		req.gva.virtual_address = mr_params->gva.virtual_address;
 45		req.gva.access_flags = mr_params->gva.access_flags;
 46		break;
 47
 48	default:
 49		ibdev_dbg(&dev->ib_dev,
 50			  "invalid param (GDMA_MR_TYPE) passed, type %d\n",
 51			  req.mr_type);
 52		return -EINVAL;
 53	}
 54
 55	err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
 56
 57	if (err || resp.hdr.status) {
 58		ibdev_dbg(&dev->ib_dev, "Failed to create mr %d, %u", err,
 59			  resp.hdr.status);
 60		if (!err)
 61			err = -EPROTO;
 62
 63		return err;
 64	}
 65
 66	mr->ibmr.lkey = resp.lkey;
 67	mr->ibmr.rkey = resp.rkey;
 68	mr->mr_handle = resp.mr_handle;
 69
 70	return 0;
 71}
 72
 73static int mana_ib_gd_destroy_mr(struct mana_ib_dev *dev, u64 mr_handle)
 74{
 75	struct gdma_destroy_mr_response resp = {};
 76	struct gdma_destroy_mr_request req = {};
 77	struct gdma_context *gc = mdev_to_gc(dev);
 78	int err;
 79
 80	mana_gd_init_req_hdr(&req.hdr, GDMA_DESTROY_MR, sizeof(req),
 81			     sizeof(resp));
 82
 83	req.mr_handle = mr_handle;
 84
 85	err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
 86	if (err || resp.hdr.status) {
 87		dev_err(gc->dev, "Failed to destroy MR: %d, 0x%x\n", err,
 88			resp.hdr.status);
 89		if (!err)
 90			err = -EPROTO;
 91		return err;
 92	}
 93
 94	return 0;
 95}
 96
 97struct ib_mr *mana_ib_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 length,
 98				  u64 iova, int access_flags,
 99				  struct ib_udata *udata)
100{
101	struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd, ibpd);
102	struct gdma_create_mr_params mr_params = {};
103	struct ib_device *ibdev = ibpd->device;
104	struct mana_ib_dev *dev;
105	struct mana_ib_mr *mr;
106	u64 dma_region_handle;
107	int err;
108
109	dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
110
111	ibdev_dbg(ibdev,
112		  "start 0x%llx, iova 0x%llx length 0x%llx access_flags 0x%x",
113		  start, iova, length, access_flags);
114
115	access_flags &= ~IB_ACCESS_OPTIONAL;
116	if (access_flags & ~VALID_MR_FLAGS)
117		return ERR_PTR(-EINVAL);
118
119	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
120	if (!mr)
121		return ERR_PTR(-ENOMEM);
122
123	mr->umem = ib_umem_get(ibdev, start, length, access_flags);
124	if (IS_ERR(mr->umem)) {
125		err = PTR_ERR(mr->umem);
126		ibdev_dbg(ibdev,
127			  "Failed to get umem for register user-mr, %d\n", err);
128		goto err_free;
129	}
130
131	err = mana_ib_create_dma_region(dev, mr->umem, &dma_region_handle, iova);
132	if (err) {
133		ibdev_dbg(ibdev, "Failed create dma region for user-mr, %d\n",
134			  err);
135		goto err_umem;
136	}
137
138	ibdev_dbg(ibdev,
139		  "created dma region for user-mr 0x%llx\n",
140		  dma_region_handle);
141
142	mr_params.pd_handle = pd->pd_handle;
143	mr_params.mr_type = GDMA_MR_TYPE_GVA;
144	mr_params.gva.dma_region_handle = dma_region_handle;
145	mr_params.gva.virtual_address = iova;
146	mr_params.gva.access_flags =
147		mana_ib_verbs_to_gdma_access_flags(access_flags);
148
149	err = mana_ib_gd_create_mr(dev, mr, &mr_params);
150	if (err)
151		goto err_dma_region;
152
153	/*
154	 * There is no need to keep track of dma_region_handle after MR is
155	 * successfully created. The dma_region_handle is tracked in the PF
156	 * as part of the lifecycle of this MR.
157	 */
158
159	return &mr->ibmr;
160
161err_dma_region:
162	mana_gd_destroy_dma_region(mdev_to_gc(dev), dma_region_handle);
163
164err_umem:
165	ib_umem_release(mr->umem);
166
167err_free:
168	kfree(mr);
169	return ERR_PTR(err);
170}
171
172int mana_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
173{
174	struct mana_ib_mr *mr = container_of(ibmr, struct mana_ib_mr, ibmr);
175	struct ib_device *ibdev = ibmr->device;
176	struct mana_ib_dev *dev;
177	int err;
178
179	dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
180
181	err = mana_ib_gd_destroy_mr(dev, mr->mr_handle);
182	if (err)
183		return err;
184
185	if (mr->umem)
186		ib_umem_release(mr->umem);
187
188	kfree(mr);
189
190	return 0;
191}