1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 
3 /* Authors: Cheng Xu <chengyou@linux.alibaba.com> */
4 /*          Kai Shen <kaishen@linux.alibaba.com> */
5 /* Copyright (c) 2020-2022, Alibaba Group. */
6 
7 #ifndef __ERDMA_VERBS_H__
8 #define __ERDMA_VERBS_H__
9 
10 #include "erdma.h"
11 
12 /* RDMA Capability. */
13 #define ERDMA_MAX_PD (128 * 1024)
14 #define ERDMA_MAX_SEND_WR 8192
15 #define ERDMA_MAX_ORD 128
16 #define ERDMA_MAX_IRD 128
17 #define ERDMA_MAX_SGE_RD 1
18 #define ERDMA_MAX_CONTEXT (128 * 1024)
19 #define ERDMA_MAX_SEND_SGE 6
20 #define ERDMA_MAX_RECV_SGE 1
21 #define ERDMA_MAX_INLINE (sizeof(struct erdma_sge) * (ERDMA_MAX_SEND_SGE))
22 #define ERDMA_MAX_FRMR_PA 512
23 
24 enum {
25 	ERDMA_MMAP_IO_NC = 0, /* no cache */
26 };
27 
28 struct erdma_user_mmap_entry {
29 	struct rdma_user_mmap_entry rdma_entry;
30 	u64 address;
31 	u8 mmap_flag;
32 };
33 
34 struct erdma_ext_db_info {
35 	bool enable;
36 	u16 sdb_off;
37 	u16 rdb_off;
38 	u16 cdb_off;
39 };
40 
41 struct erdma_ucontext {
42 	struct ib_ucontext ibucontext;
43 
44 	struct erdma_ext_db_info ext_db;
45 
46 	u64 sdb;
47 	u64 rdb;
48 	u64 cdb;
49 
50 	struct rdma_user_mmap_entry *sq_db_mmap_entry;
51 	struct rdma_user_mmap_entry *rq_db_mmap_entry;
52 	struct rdma_user_mmap_entry *cq_db_mmap_entry;
53 
54 	/* doorbell records */
55 	struct list_head dbrecords_page_list;
56 	struct mutex dbrecords_page_mutex;
57 };
58 
59 struct erdma_pd {
60 	struct ib_pd ibpd;
61 	u32 pdn;
62 };
63 
64 /*
65  * MemoryRegion definition.
66  */
67 #define ERDMA_MAX_INLINE_MTT_ENTRIES 4
68 #define MTT_SIZE(mtt_cnt) ((mtt_cnt) << 3) /* per mtt entry takes 8 Bytes. */
69 #define ERDMA_MR_MAX_MTT_CNT 524288
70 #define ERDMA_MTT_ENTRY_SIZE 8
71 
72 #define ERDMA_MR_TYPE_NORMAL 0
73 #define ERDMA_MR_TYPE_FRMR 1
74 #define ERDMA_MR_TYPE_DMA 2
75 
76 #define ERDMA_MR_MTT_0LEVEL 0
77 #define ERDMA_MR_MTT_1LEVEL 1
78 
79 #define ERDMA_MR_ACC_RA BIT(0)
80 #define ERDMA_MR_ACC_LR BIT(1)
81 #define ERDMA_MR_ACC_LW BIT(2)
82 #define ERDMA_MR_ACC_RR BIT(3)
83 #define ERDMA_MR_ACC_RW BIT(4)
84 
85 static inline u8 to_erdma_access_flags(int access)
86 {
87 	return (access & IB_ACCESS_REMOTE_READ ? ERDMA_MR_ACC_RR : 0) |
88 	       (access & IB_ACCESS_LOCAL_WRITE ? ERDMA_MR_ACC_LW : 0) |
89 	       (access & IB_ACCESS_REMOTE_WRITE ? ERDMA_MR_ACC_RW : 0) |
90 	       (access & IB_ACCESS_REMOTE_ATOMIC ? ERDMA_MR_ACC_RA : 0);
91 }
92 
93 /* Hierarchical storage structure for MTT entries */
94 struct erdma_mtt {
95 	u64 *buf;
96 	size_t size;
97 
98 	bool continuous;
99 	union {
100 		dma_addr_t buf_dma;
101 		struct {
102 			struct scatterlist *sglist;
103 			u32 nsg;
104 			u32 level;
105 		};
106 	};
107 
108 	struct erdma_mtt *low_level;
109 };
110 
111 struct erdma_mem {
112 	struct ib_umem *umem;
113 	struct erdma_mtt *mtt;
114 
115 	u32 page_size;
116 	u32 page_offset;
117 	u32 page_cnt;
118 	u32 mtt_nents;
119 
120 	u64 va;
121 	u64 len;
122 };
123 
124 struct erdma_mr {
125 	struct ib_mr ibmr;
126 	struct erdma_mem mem;
127 	u8 type;
128 	u8 access;
129 	u8 valid;
130 };
131 
132 struct erdma_user_dbrecords_page {
133 	struct list_head list;
134 	struct ib_umem *umem;
135 	u64 va;
136 	int refcnt;
137 };
138 
139 struct erdma_uqp {
140 	struct erdma_mem sq_mem;
141 	struct erdma_mem rq_mem;
142 
143 	dma_addr_t sq_db_info_dma_addr;
144 	dma_addr_t rq_db_info_dma_addr;
145 
146 	struct erdma_user_dbrecords_page *user_dbr_page;
147 
148 	u32 rq_offset;
149 };
150 
151 struct erdma_kqp {
152 	u16 sq_pi;
153 	u16 sq_ci;
154 
155 	u16 rq_pi;
156 	u16 rq_ci;
157 
158 	u64 *swr_tbl;
159 	u64 *rwr_tbl;
160 
161 	void __iomem *hw_sq_db;
162 	void __iomem *hw_rq_db;
163 
164 	void *sq_buf;
165 	dma_addr_t sq_buf_dma_addr;
166 
167 	void *rq_buf;
168 	dma_addr_t rq_buf_dma_addr;
169 
170 	void *sq_db_info;
171 	void *rq_db_info;
172 
173 	u8 sig_all;
174 };
175 
176 enum erdma_qp_state {
177 	ERDMA_QP_STATE_IDLE = 0,
178 	ERDMA_QP_STATE_RTR = 1,
179 	ERDMA_QP_STATE_RTS = 2,
180 	ERDMA_QP_STATE_CLOSING = 3,
181 	ERDMA_QP_STATE_TERMINATE = 4,
182 	ERDMA_QP_STATE_ERROR = 5,
183 	ERDMA_QP_STATE_UNDEF = 7,
184 	ERDMA_QP_STATE_COUNT = 8
185 };
186 
187 enum erdma_qp_attr_mask {
188 	ERDMA_QP_ATTR_STATE = (1 << 0),
189 	ERDMA_QP_ATTR_LLP_HANDLE = (1 << 2),
190 	ERDMA_QP_ATTR_ORD = (1 << 3),
191 	ERDMA_QP_ATTR_IRD = (1 << 4),
192 	ERDMA_QP_ATTR_SQ_SIZE = (1 << 5),
193 	ERDMA_QP_ATTR_RQ_SIZE = (1 << 6),
194 	ERDMA_QP_ATTR_MPA = (1 << 7)
195 };
196 
197 enum erdma_qp_flags {
198 	ERDMA_QP_IN_FLUSHING = (1 << 0),
199 };
200 
201 struct erdma_qp_attrs {
202 	enum erdma_qp_state state;
203 	enum erdma_cc_alg cc; /* Congestion control algorithm */
204 	u32 sq_size;
205 	u32 rq_size;
206 	u32 orq_size;
207 	u32 irq_size;
208 	u32 max_send_sge;
209 	u32 max_recv_sge;
210 	u32 cookie;
211 #define ERDMA_QP_ACTIVE 0
212 #define ERDMA_QP_PASSIVE 1
213 	u8 qp_type;
214 	u8 pd_len;
215 };
216 
217 struct erdma_qp {
218 	struct ib_qp ibqp;
219 	struct kref ref;
220 	struct completion safe_free;
221 	struct erdma_dev *dev;
222 	struct erdma_cep *cep;
223 	struct rw_semaphore state_lock;
224 
225 	unsigned long flags;
226 	struct delayed_work reflush_dwork;
227 
228 	union {
229 		struct erdma_kqp kern_qp;
230 		struct erdma_uqp user_qp;
231 	};
232 
233 	struct erdma_cq *scq;
234 	struct erdma_cq *rcq;
235 
236 	struct erdma_qp_attrs attrs;
237 	spinlock_t lock;
238 };
239 
240 struct erdma_kcq_info {
241 	void *qbuf;
242 	dma_addr_t qbuf_dma_addr;
243 	u32 ci;
244 	u32 cmdsn;
245 	u32 notify_cnt;
246 
247 	spinlock_t lock;
248 	u8 __iomem *db;
249 	u64 *db_record;
250 };
251 
252 struct erdma_ucq_info {
253 	struct erdma_mem qbuf_mem;
254 	struct erdma_user_dbrecords_page *user_dbr_page;
255 	dma_addr_t db_info_dma_addr;
256 };
257 
258 struct erdma_cq {
259 	struct ib_cq ibcq;
260 	u32 cqn;
261 
262 	u32 depth;
263 	u32 assoc_eqn;
264 
265 	union {
266 		struct erdma_kcq_info kern_cq;
267 		struct erdma_ucq_info user_cq;
268 	};
269 };
270 
271 #define QP_ID(qp) ((qp)->ibqp.qp_num)
272 
273 static inline struct erdma_qp *find_qp_by_qpn(struct erdma_dev *dev, int id)
274 {
275 	return (struct erdma_qp *)xa_load(&dev->qp_xa, id);
276 }
277 
278 static inline struct erdma_cq *find_cq_by_cqn(struct erdma_dev *dev, int id)
279 {
280 	return (struct erdma_cq *)xa_load(&dev->cq_xa, id);
281 }
282 
283 void erdma_qp_get(struct erdma_qp *qp);
284 void erdma_qp_put(struct erdma_qp *qp);
285 int erdma_modify_qp_internal(struct erdma_qp *qp, struct erdma_qp_attrs *attrs,
286 			     enum erdma_qp_attr_mask mask);
287 void erdma_qp_llp_close(struct erdma_qp *qp);
288 void erdma_qp_cm_drop(struct erdma_qp *qp);
289 
290 static inline struct erdma_ucontext *to_ectx(struct ib_ucontext *ibctx)
291 {
292 	return container_of(ibctx, struct erdma_ucontext, ibucontext);
293 }
294 
295 static inline struct erdma_pd *to_epd(struct ib_pd *pd)
296 {
297 	return container_of(pd, struct erdma_pd, ibpd);
298 }
299 
300 static inline struct erdma_mr *to_emr(struct ib_mr *ibmr)
301 {
302 	return container_of(ibmr, struct erdma_mr, ibmr);
303 }
304 
305 static inline struct erdma_qp *to_eqp(struct ib_qp *qp)
306 {
307 	return container_of(qp, struct erdma_qp, ibqp);
308 }
309 
310 static inline struct erdma_cq *to_ecq(struct ib_cq *ibcq)
311 {
312 	return container_of(ibcq, struct erdma_cq, ibcq);
313 }
314 
315 static inline struct erdma_user_mmap_entry *
316 to_emmap(struct rdma_user_mmap_entry *ibmmap)
317 {
318 	return container_of(ibmmap, struct erdma_user_mmap_entry, rdma_entry);
319 }
320 
321 int erdma_alloc_ucontext(struct ib_ucontext *ibctx, struct ib_udata *data);
322 void erdma_dealloc_ucontext(struct ib_ucontext *ibctx);
323 int erdma_query_device(struct ib_device *dev, struct ib_device_attr *attr,
324 		       struct ib_udata *data);
325 int erdma_get_port_immutable(struct ib_device *dev, u32 port,
326 			     struct ib_port_immutable *ib_port_immutable);
327 int erdma_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
328 		    struct ib_udata *data);
329 int erdma_query_port(struct ib_device *dev, u32 port,
330 		     struct ib_port_attr *attr);
331 int erdma_query_gid(struct ib_device *dev, u32 port, int idx,
332 		    union ib_gid *gid);
333 int erdma_alloc_pd(struct ib_pd *ibpd, struct ib_udata *data);
334 int erdma_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata);
335 int erdma_create_qp(struct ib_qp *ibqp, struct ib_qp_init_attr *attr,
336 		    struct ib_udata *data);
337 int erdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int mask,
338 		   struct ib_qp_init_attr *init_attr);
339 int erdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int mask,
340 		    struct ib_udata *data);
341 int erdma_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata);
342 int erdma_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata);
343 int erdma_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags);
344 struct ib_mr *erdma_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 len,
345 				u64 virt, int access, struct ib_udata *udata);
346 struct ib_mr *erdma_get_dma_mr(struct ib_pd *ibpd, int rights);
347 int erdma_dereg_mr(struct ib_mr *ibmr, struct ib_udata *data);
348 int erdma_mmap(struct ib_ucontext *ctx, struct vm_area_struct *vma);
349 void erdma_mmap_free(struct rdma_user_mmap_entry *rdma_entry);
350 void erdma_qp_get_ref(struct ib_qp *ibqp);
351 void erdma_qp_put_ref(struct ib_qp *ibqp);
352 struct ib_qp *erdma_get_ibqp(struct ib_device *dev, int id);
353 int erdma_post_send(struct ib_qp *ibqp, const struct ib_send_wr *send_wr,
354 		    const struct ib_send_wr **bad_send_wr);
355 int erdma_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *recv_wr,
356 		    const struct ib_recv_wr **bad_recv_wr);
357 int erdma_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc);
358 struct ib_mr *erdma_ib_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type,
359 				u32 max_num_sg);
360 int erdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
361 		    unsigned int *sg_offset);
362 void erdma_port_event(struct erdma_dev *dev, enum ib_event_type reason);
363 void erdma_set_mtu(struct erdma_dev *dev, u32 mtu);
364 
365 #endif
366