1 /*
2 * linux/drivers/net/ehea/ehea_qmr.h
3 *
4 * eHEA ethernet device driver for IBM eServer System p
5 *
6 * (C) Copyright IBM Corp. 2006
7 *
8 * Authors:
9 * Christoph Raisch <raisch@de.ibm.com>
10 * Jan-Bernd Themann <themann@de.ibm.com>
11 * Thomas Klein <tklein@de.ibm.com>
12 *
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 */
28
29 #ifndef __EHEA_QMR_H__
30 #define __EHEA_QMR_H__
31
32 #include "ehea.h"
33 #include "ehea_hw.h"
34
35 /*
36 * page size of ehea hardware queues
37 */
38
39 #define EHEA_PAGESHIFT 12
40 #define EHEA_PAGESIZE (1UL << EHEA_PAGESHIFT)
41 #define EHEA_SECTSIZE (1UL << 24)
42 #define EHEA_PAGES_PER_SECTION (EHEA_SECTSIZE >> EHEA_PAGESHIFT)
43 #define EHEA_HUGEPAGESHIFT 34
44 #define EHEA_HUGEPAGE_SIZE (1UL << EHEA_HUGEPAGESHIFT)
45 #define EHEA_HUGEPAGE_PFN_MASK ((EHEA_HUGEPAGE_SIZE - 1) >> PAGE_SHIFT)
46
47 #if ((1UL << SECTION_SIZE_BITS) < EHEA_SECTSIZE)
48 #error eHEA module cannot work if kernel sectionsize < ehea sectionsize
49 #endif
50
51 /* Some abbreviations used here:
52 *
53 * WQE - Work Queue Entry
54 * SWQE - Send Work Queue Entry
55 * RWQE - Receive Work Queue Entry
56 * CQE - Completion Queue Entry
57 * EQE - Event Queue Entry
58 * MR - Memory Region
59 */
60
61 /* Use of WR_ID field for EHEA */
62 #define EHEA_WR_ID_COUNT EHEA_BMASK_IBM(0, 19)
63 #define EHEA_WR_ID_TYPE EHEA_BMASK_IBM(20, 23)
64 #define EHEA_SWQE2_TYPE 0x1
65 #define EHEA_SWQE3_TYPE 0x2
66 #define EHEA_RWQE2_TYPE 0x3
67 #define EHEA_RWQE3_TYPE 0x4
68 #define EHEA_WR_ID_INDEX EHEA_BMASK_IBM(24, 47)
69 #define EHEA_WR_ID_REFILL EHEA_BMASK_IBM(48, 63)
70
71 struct ehea_vsgentry {
72 u64 vaddr;
73 u32 l_key;
74 u32 len;
75 };
76
77 /* maximum number of sg entries allowed in a WQE */
78 #define EHEA_MAX_WQE_SG_ENTRIES 252
79 #define SWQE2_MAX_IMM (0xD0 - 0x30)
80 #define SWQE3_MAX_IMM 224
81
82 /* tx control flags for swqe */
83 #define EHEA_SWQE_CRC 0x8000
84 #define EHEA_SWQE_IP_CHECKSUM 0x4000
85 #define EHEA_SWQE_TCP_CHECKSUM 0x2000
86 #define EHEA_SWQE_TSO 0x1000
87 #define EHEA_SWQE_SIGNALLED_COMPLETION 0x0800
88 #define EHEA_SWQE_VLAN_INSERT 0x0400
89 #define EHEA_SWQE_IMM_DATA_PRESENT 0x0200
90 #define EHEA_SWQE_DESCRIPTORS_PRESENT 0x0100
91 #define EHEA_SWQE_WRAP_CTL_REC 0x0080
92 #define EHEA_SWQE_WRAP_CTL_FORCE 0x0040
93 #define EHEA_SWQE_BIND 0x0020
94 #define EHEA_SWQE_PURGE 0x0010
95
96 /* sizeof(struct ehea_swqe) less the union */
97 #define SWQE_HEADER_SIZE 32
98
99 struct ehea_swqe {
100 u64 wr_id;
101 u16 tx_control;
102 u16 vlan_tag;
103 u8 reserved1;
104 u8 ip_start;
105 u8 ip_end;
106 u8 immediate_data_length;
107 u8 tcp_offset;
108 u8 reserved2;
109 u16 tcp_end;
110 u8 wrap_tag;
111 u8 descriptors; /* number of valid descriptors in WQE */
112 u16 reserved3;
113 u16 reserved4;
114 u16 mss;
115 u32 reserved5;
116 union {
117 /* Send WQE Format 1 */
118 struct {
119 struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
120 } no_immediate_data;
121
122 /* Send WQE Format 2 */
123 struct {
124 struct ehea_vsgentry sg_entry;
125 /* 0x30 */
126 u8 immediate_data[SWQE2_MAX_IMM];
127 /* 0xd0 */
128 struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES-1];
129 } immdata_desc __attribute__ ((packed));
130
131 /* Send WQE Format 3 */
132 struct {
133 u8 immediate_data[SWQE3_MAX_IMM];
134 } immdata_nodesc;
135 } u;
136 };
137
138 struct ehea_rwqe {
139 u64 wr_id; /* work request ID */
140 u8 reserved1[5];
141 u8 data_segments;
142 u16 reserved2;
143 u64 reserved3;
144 u64 reserved4;
145 struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
146 };
147
148 #define EHEA_CQE_VLAN_TAG_XTRACT 0x0400
149
150 #define EHEA_CQE_TYPE_RQ 0x60
151 #define EHEA_CQE_STAT_ERR_MASK 0x700F
152 #define EHEA_CQE_STAT_FAT_ERR_MASK 0xF
153 #define EHEA_CQE_STAT_ERR_TCP 0x4000
154 #define EHEA_CQE_STAT_ERR_IP 0x2000
155 #define EHEA_CQE_STAT_ERR_CRC 0x1000
156
157 struct ehea_cqe {
158 u64 wr_id; /* work request ID from WQE */
159 u8 type;
160 u8 valid;
161 u16 status;
162 u16 reserved1;
163 u16 num_bytes_transfered;
164 u16 vlan_tag;
165 u16 inet_checksum_value;
166 u8 reserved2;
167 u8 header_length;
168 u16 reserved3;
169 u16 page_offset;
170 u16 wqe_count;
171 u32 qp_token;
172 u32 timestamp;
173 u32 reserved4;
174 u64 reserved5[3];
175 };
176
177 #define EHEA_EQE_VALID EHEA_BMASK_IBM(0, 0)
178 #define EHEA_EQE_IS_CQE EHEA_BMASK_IBM(1, 1)
179 #define EHEA_EQE_IDENTIFIER EHEA_BMASK_IBM(2, 7)
180 #define EHEA_EQE_QP_CQ_NUMBER EHEA_BMASK_IBM(8, 31)
181 #define EHEA_EQE_QP_TOKEN EHEA_BMASK_IBM(32, 63)
182 #define EHEA_EQE_CQ_TOKEN EHEA_BMASK_IBM(32, 63)
183 #define EHEA_EQE_KEY EHEA_BMASK_IBM(32, 63)
184 #define EHEA_EQE_PORT_NUMBER EHEA_BMASK_IBM(56, 63)
185 #define EHEA_EQE_EQ_NUMBER EHEA_BMASK_IBM(48, 63)
186 #define EHEA_EQE_SM_ID EHEA_BMASK_IBM(48, 63)
187 #define EHEA_EQE_SM_MECH_NUMBER EHEA_BMASK_IBM(48, 55)
188 #define EHEA_EQE_SM_PORT_NUMBER EHEA_BMASK_IBM(56, 63)
189
190 struct ehea_eqe {
191 u64 entry;
192 };
193
194 #define ERROR_DATA_LENGTH EHEA_BMASK_IBM(52, 63)
195 #define ERROR_DATA_TYPE EHEA_BMASK_IBM(0, 7)
196
197 static inline void *hw_qeit_calc(struct hw_queue *queue, u64 q_offset)
198 {
199 struct ehea_page *current_page;
200
201 if (q_offset >= queue->queue_length)
202 q_offset -= queue->queue_length;
203 current_page = (queue->queue_pages)[q_offset >> EHEA_PAGESHIFT];
204 return ¤t_page->entries[q_offset & (EHEA_PAGESIZE - 1)];
205 }
206
207 static inline void *hw_qeit_get(struct hw_queue *queue)
208 {
209 return hw_qeit_calc(queue, queue->current_q_offset);
210 }
211
212 static inline void hw_qeit_inc(struct hw_queue *queue)
213 {
214 queue->current_q_offset += queue->qe_size;
215 if (queue->current_q_offset >= queue->queue_length) {
216 queue->current_q_offset = 0;
217 /* toggle the valid flag */
218 queue->toggle_state = (~queue->toggle_state) & 1;
219 }
220 }
221
222 static inline void *hw_qeit_get_inc(struct hw_queue *queue)
223 {
224 void *retvalue = hw_qeit_get(queue);
225 hw_qeit_inc(queue);
226 return retvalue;
227 }
228
229 static inline void *hw_qeit_get_inc_valid(struct hw_queue *queue)
230 {
231 struct ehea_cqe *retvalue = hw_qeit_get(queue);
232 u8 valid = retvalue->valid;
233 void *pref;
234
235 if ((valid >> 7) == (queue->toggle_state & 1)) {
236 /* this is a good one */
237 hw_qeit_inc(queue);
238 pref = hw_qeit_calc(queue, queue->current_q_offset);
239 prefetch(pref);
240 prefetch(pref + 128);
241 } else
242 retvalue = NULL;
243 return retvalue;
244 }
245
246 static inline void *hw_qeit_get_valid(struct hw_queue *queue)
247 {
248 struct ehea_cqe *retvalue = hw_qeit_get(queue);
249 void *pref;
250 u8 valid;
251
252 pref = hw_qeit_calc(queue, queue->current_q_offset);
253 prefetch(pref);
254 prefetch(pref + 128);
255 prefetch(pref + 256);
256 valid = retvalue->valid;
257 if (!((valid >> 7) == (queue->toggle_state & 1)))
258 retvalue = NULL;
259 return retvalue;
260 }
261
262 static inline void *hw_qeit_reset(struct hw_queue *queue)
263 {
264 queue->current_q_offset = 0;
265 return hw_qeit_get(queue);
266 }
267
268 static inline void *hw_qeit_eq_get_inc(struct hw_queue *queue)
269 {
270 u64 last_entry_in_q = queue->queue_length - queue->qe_size;
271 void *retvalue;
272
273 retvalue = hw_qeit_get(queue);
274 queue->current_q_offset += queue->qe_size;
275 if (queue->current_q_offset > last_entry_in_q) {
276 queue->current_q_offset = 0;
277 queue->toggle_state = (~queue->toggle_state) & 1;
278 }
279 return retvalue;
280 }
281
282 static inline void *hw_eqit_eq_get_inc_valid(struct hw_queue *queue)
283 {
284 void *retvalue = hw_qeit_get(queue);
285 u32 qe = *(u8 *)retvalue;
286 if ((qe >> 7) == (queue->toggle_state & 1))
287 hw_qeit_eq_get_inc(queue);
288 else
289 retvalue = NULL;
290 return retvalue;
291 }
292
293 static inline struct ehea_rwqe *ehea_get_next_rwqe(struct ehea_qp *qp,
294 int rq_nr)
295 {
296 struct hw_queue *queue;
297
298 if (rq_nr == 1)
299 queue = &qp->hw_rqueue1;
300 else if (rq_nr == 2)
301 queue = &qp->hw_rqueue2;
302 else
303 queue = &qp->hw_rqueue3;
304
305 return hw_qeit_get_inc(queue);
306 }
307
308 static inline struct ehea_swqe *ehea_get_swqe(struct ehea_qp *my_qp,
309 int *wqe_index)
310 {
311 struct hw_queue *queue = &my_qp->hw_squeue;
312 struct ehea_swqe *wqe_p;
313
314 *wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_SQ);
315 wqe_p = hw_qeit_get_inc(&my_qp->hw_squeue);
316
317 return wqe_p;
318 }
319
320 static inline void ehea_post_swqe(struct ehea_qp *my_qp, struct ehea_swqe *swqe)
321 {
322 iosync();
323 ehea_update_sqa(my_qp, 1);
324 }
325
326 static inline struct ehea_cqe *ehea_poll_rq1(struct ehea_qp *qp, int *wqe_index)
327 {
328 struct hw_queue *queue = &qp->hw_rqueue1;
329
330 *wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_RQ1);
331 return hw_qeit_get_valid(queue);
332 }
333
334 static inline void ehea_inc_cq(struct ehea_cq *cq)
335 {
336 hw_qeit_inc(&cq->hw_queue);
337 }
338
339 static inline void ehea_inc_rq1(struct ehea_qp *qp)
340 {
341 hw_qeit_inc(&qp->hw_rqueue1);
342 }
343
344 static inline struct ehea_cqe *ehea_poll_cq(struct ehea_cq *my_cq)
345 {
346 return hw_qeit_get_valid(&my_cq->hw_queue);
347 }
348
349 #define EHEA_CQ_REGISTER_ORIG 0
350 #define EHEA_EQ_REGISTER_ORIG 0
351
352 enum ehea_eq_type {
353 EHEA_EQ = 0, /* event queue */
354 EHEA_NEQ /* notification event queue */
355 };
356
357 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
358 enum ehea_eq_type type,
359 const u32 length, const u8 eqe_gen);
360
361 int ehea_destroy_eq(struct ehea_eq *eq);
362
363 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq);
364
365 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter, int cqe,
366 u64 eq_handle, u32 cq_token);
367
368 int ehea_destroy_cq(struct ehea_cq *cq);
369
370 struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter, u32 pd,
371 struct ehea_qp_init_attr *init_attr);
372
373 int ehea_destroy_qp(struct ehea_qp *qp);
374
375 int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr);
376
377 int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
378 struct ehea_mr *shared_mr);
379
380 int ehea_rem_mr(struct ehea_mr *mr);
381
382 void ehea_error_data(struct ehea_adapter *adapter, u64 res_handle);
383
384 int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages);
385 int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages);
386 int ehea_create_busmap(void);
387 void ehea_destroy_busmap(void);
388 u64 ehea_map_vaddr(void *caddr);
389
390 #endif /* __EHEA_QMR_H__ */
391
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