1 /*
2 * linux/drivers/net/ethernet/ibm/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 <linux/prefetch.h>
33 #include "ehea.h"
34 #include "ehea_hw.h"
35
36 /*
37 * page size of ehea hardware queues
38 */
39
40 #define EHEA_PAGESHIFT 12
41 #define EHEA_PAGESIZE (1UL << EHEA_PAGESHIFT)
42 #define EHEA_SECTSIZE (1UL << 24)
43 #define EHEA_PAGES_PER_SECTION (EHEA_SECTSIZE >> EHEA_PAGESHIFT)
44 #define EHEA_HUGEPAGESHIFT 34
45 #define EHEA_HUGEPAGE_SIZE (1UL << EHEA_HUGEPAGESHIFT)
46 #define EHEA_HUGEPAGE_PFN_MASK ((EHEA_HUGEPAGE_SIZE - 1) >> PAGE_SHIFT)
47
48 #if ((1UL << SECTION_SIZE_BITS) < EHEA_SECTSIZE)
49 #error eHEA module cannot work if kernel sectionsize < ehea sectionsize
50 #endif
51
52 /* Some abbreviations used here:
53 *
54 * WQE - Work Queue Entry
55 * SWQE - Send Work Queue Entry
56 * RWQE - Receive Work Queue Entry
57 * CQE - Completion Queue Entry
58 * EQE - Event Queue Entry
59 * MR - Memory Region
60 */
61
62 /* Use of WR_ID field for EHEA */
63 #define EHEA_WR_ID_COUNT EHEA_BMASK_IBM(0, 19)
64 #define EHEA_WR_ID_TYPE EHEA_BMASK_IBM(20, 23)
65 #define EHEA_SWQE2_TYPE 0x1
66 #define EHEA_SWQE3_TYPE 0x2
67 #define EHEA_RWQE2_TYPE 0x3
68 #define EHEA_RWQE3_TYPE 0x4
69 #define EHEA_WR_ID_INDEX EHEA_BMASK_IBM(24, 47)
70 #define EHEA_WR_ID_REFILL EHEA_BMASK_IBM(48, 63)
71
72 struct ehea_vsgentry {
73 u64 vaddr;
74 u32 l_key;
75 u32 len;
76 };
77
78 /* maximum number of sg entries allowed in a WQE */
79 #define EHEA_MAX_WQE_SG_ENTRIES 252
80 #define SWQE2_MAX_IMM (0xD0 - 0x30)
81 #define SWQE3_MAX_IMM 224
82
83 /* tx control flags for swqe */
84 #define EHEA_SWQE_CRC 0x8000
85 #define EHEA_SWQE_IP_CHECKSUM 0x4000
86 #define EHEA_SWQE_TCP_CHECKSUM 0x2000
87 #define EHEA_SWQE_TSO 0x1000
88 #define EHEA_SWQE_SIGNALLED_COMPLETION 0x0800
89 #define EHEA_SWQE_VLAN_INSERT 0x0400
90 #define EHEA_SWQE_IMM_DATA_PRESENT 0x0200
91 #define EHEA_SWQE_DESCRIPTORS_PRESENT 0x0100
92 #define EHEA_SWQE_WRAP_CTL_REC 0x0080
93 #define EHEA_SWQE_WRAP_CTL_FORCE 0x0040
94 #define EHEA_SWQE_BIND 0x0020
95 #define EHEA_SWQE_PURGE 0x0010
96
97 /* sizeof(struct ehea_swqe) less the union */
98 #define SWQE_HEADER_SIZE 32
99
100 struct ehea_swqe {
101 u64 wr_id;
102 u16 tx_control;
103 u16 vlan_tag;
104 u8 reserved1;
105 u8 ip_start;
106 u8 ip_end;
107 u8 immediate_data_length;
108 u8 tcp_offset;
109 u8 reserved2;
110 u16 reserved2b;
111 u8 wrap_tag;
112 u8 descriptors; /* number of valid descriptors in WQE */
113 u16 reserved3;
114 u16 reserved4;
115 u16 mss;
116 u32 reserved5;
117 union {
118 /* Send WQE Format 1 */
119 struct {
120 struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
121 } no_immediate_data;
122
123 /* Send WQE Format 2 */
124 struct {
125 struct ehea_vsgentry sg_entry;
126 /* 0x30 */
127 u8 immediate_data[SWQE2_MAX_IMM];
128 /* 0xd0 */
129 struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES-1];
130 } immdata_desc __packed;
131
132 /* Send WQE Format 3 */
133 struct {
134 u8 immediate_data[SWQE3_MAX_IMM];
135 } immdata_nodesc;
136 } u;
137 };
138
139 struct ehea_rwqe {
140 u64 wr_id; /* work request ID */
141 u8 reserved1[5];
142 u8 data_segments;
143 u16 reserved2;
144 u64 reserved3;
145 u64 reserved4;
146 struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
147 };
148
149 #define EHEA_CQE_VLAN_TAG_XTRACT 0x0400
150
151 #define EHEA_CQE_TYPE_RQ 0x60
152 #define EHEA_CQE_STAT_ERR_MASK 0x700F
153 #define EHEA_CQE_STAT_FAT_ERR_MASK 0xF
154 #define EHEA_CQE_BLIND_CKSUM 0x8000
155 #define EHEA_CQE_STAT_ERR_TCP 0x4000
156 #define EHEA_CQE_STAT_ERR_IP 0x2000
157 #define EHEA_CQE_STAT_ERR_CRC 0x1000
158
159 /* Defines which bad send cqe stati lead to a port reset */
160 #define EHEA_CQE_STAT_RESET_MASK 0x0002
161
162 struct ehea_cqe {
163 u64 wr_id; /* work request ID from WQE */
164 u8 type;
165 u8 valid;
166 u16 status;
167 u16 reserved1;
168 u16 num_bytes_transfered;
169 u16 vlan_tag;
170 u16 inet_checksum_value;
171 u8 reserved2;
172 u8 header_length;
173 u16 reserved3;
174 u16 page_offset;
175 u16 wqe_count;
176 u32 qp_token;
177 u32 timestamp;
178 u32 reserved4;
179 u64 reserved5[3];
180 };
181
182 #define EHEA_EQE_VALID EHEA_BMASK_IBM(0, 0)
183 #define EHEA_EQE_IS_CQE EHEA_BMASK_IBM(1, 1)
184 #define EHEA_EQE_IDENTIFIER EHEA_BMASK_IBM(2, 7)
185 #define EHEA_EQE_QP_CQ_NUMBER EHEA_BMASK_IBM(8, 31)
186 #define EHEA_EQE_QP_TOKEN EHEA_BMASK_IBM(32, 63)
187 #define EHEA_EQE_CQ_TOKEN EHEA_BMASK_IBM(32, 63)
188 #define EHEA_EQE_KEY EHEA_BMASK_IBM(32, 63)
189 #define EHEA_EQE_PORT_NUMBER EHEA_BMASK_IBM(56, 63)
190 #define EHEA_EQE_EQ_NUMBER EHEA_BMASK_IBM(48, 63)
191 #define EHEA_EQE_SM_ID EHEA_BMASK_IBM(48, 63)
192 #define EHEA_EQE_SM_MECH_NUMBER EHEA_BMASK_IBM(48, 55)
193 #define EHEA_EQE_SM_PORT_NUMBER EHEA_BMASK_IBM(56, 63)
194
195 #define EHEA_AER_RESTYPE_QP 0x8
196 #define EHEA_AER_RESTYPE_CQ 0x4
197 #define EHEA_AER_RESTYPE_EQ 0x3
198
199 /* Defines which affiliated errors lead to a port reset */
200 #define EHEA_AER_RESET_MASK 0xFFFFFFFFFEFFFFFFULL
201 #define EHEA_AERR_RESET_MASK 0xFFFFFFFFFFFFFFFFULL
202
203 struct ehea_eqe {
204 u64 entry;
205 };
206
207 #define ERROR_DATA_LENGTH EHEA_BMASK_IBM(52, 63)
208 #define ERROR_DATA_TYPE EHEA_BMASK_IBM(0, 7)
209
hw_qeit_calc(struct hw_queue * queue,u64 q_offset)210 static inline void *hw_qeit_calc(struct hw_queue *queue, u64 q_offset)
211 {
212 struct ehea_page *current_page;
213
214 if (q_offset >= queue->queue_length)
215 q_offset -= queue->queue_length;
216 current_page = (queue->queue_pages)[q_offset >> EHEA_PAGESHIFT];
217 return ¤t_page->entries[q_offset & (EHEA_PAGESIZE - 1)];
218 }
219
hw_qeit_get(struct hw_queue * queue)220 static inline void *hw_qeit_get(struct hw_queue *queue)
221 {
222 return hw_qeit_calc(queue, queue->current_q_offset);
223 }
224
hw_qeit_inc(struct hw_queue * queue)225 static inline void hw_qeit_inc(struct hw_queue *queue)
226 {
227 queue->current_q_offset += queue->qe_size;
228 if (queue->current_q_offset >= queue->queue_length) {
229 queue->current_q_offset = 0;
230 /* toggle the valid flag */
231 queue->toggle_state = (~queue->toggle_state) & 1;
232 }
233 }
234
hw_qeit_get_inc(struct hw_queue * queue)235 static inline void *hw_qeit_get_inc(struct hw_queue *queue)
236 {
237 void *retvalue = hw_qeit_get(queue);
238 hw_qeit_inc(queue);
239 return retvalue;
240 }
241
hw_qeit_get_inc_valid(struct hw_queue * queue)242 static inline void *hw_qeit_get_inc_valid(struct hw_queue *queue)
243 {
244 struct ehea_cqe *retvalue = hw_qeit_get(queue);
245 u8 valid = retvalue->valid;
246 void *pref;
247
248 if ((valid >> 7) == (queue->toggle_state & 1)) {
249 /* this is a good one */
250 hw_qeit_inc(queue);
251 pref = hw_qeit_calc(queue, queue->current_q_offset);
252 prefetch(pref);
253 prefetch(pref + 128);
254 } else
255 retvalue = NULL;
256 return retvalue;
257 }
258
hw_qeit_get_valid(struct hw_queue * queue)259 static inline void *hw_qeit_get_valid(struct hw_queue *queue)
260 {
261 struct ehea_cqe *retvalue = hw_qeit_get(queue);
262 void *pref;
263 u8 valid;
264
265 pref = hw_qeit_calc(queue, queue->current_q_offset);
266 prefetch(pref);
267 prefetch(pref + 128);
268 prefetch(pref + 256);
269 valid = retvalue->valid;
270 if (!((valid >> 7) == (queue->toggle_state & 1)))
271 retvalue = NULL;
272 return retvalue;
273 }
274
hw_qeit_reset(struct hw_queue * queue)275 static inline void *hw_qeit_reset(struct hw_queue *queue)
276 {
277 queue->current_q_offset = 0;
278 return hw_qeit_get(queue);
279 }
280
hw_qeit_eq_get_inc(struct hw_queue * queue)281 static inline void *hw_qeit_eq_get_inc(struct hw_queue *queue)
282 {
283 u64 last_entry_in_q = queue->queue_length - queue->qe_size;
284 void *retvalue;
285
286 retvalue = hw_qeit_get(queue);
287 queue->current_q_offset += queue->qe_size;
288 if (queue->current_q_offset > last_entry_in_q) {
289 queue->current_q_offset = 0;
290 queue->toggle_state = (~queue->toggle_state) & 1;
291 }
292 return retvalue;
293 }
294
hw_eqit_eq_get_inc_valid(struct hw_queue * queue)295 static inline void *hw_eqit_eq_get_inc_valid(struct hw_queue *queue)
296 {
297 void *retvalue = hw_qeit_get(queue);
298 u32 qe = *(u8 *)retvalue;
299 if ((qe >> 7) == (queue->toggle_state & 1))
300 hw_qeit_eq_get_inc(queue);
301 else
302 retvalue = NULL;
303 return retvalue;
304 }
305
ehea_get_next_rwqe(struct ehea_qp * qp,int rq_nr)306 static inline struct ehea_rwqe *ehea_get_next_rwqe(struct ehea_qp *qp,
307 int rq_nr)
308 {
309 struct hw_queue *queue;
310
311 if (rq_nr == 1)
312 queue = &qp->hw_rqueue1;
313 else if (rq_nr == 2)
314 queue = &qp->hw_rqueue2;
315 else
316 queue = &qp->hw_rqueue3;
317
318 return hw_qeit_get_inc(queue);
319 }
320
ehea_get_swqe(struct ehea_qp * my_qp,int * wqe_index)321 static inline struct ehea_swqe *ehea_get_swqe(struct ehea_qp *my_qp,
322 int *wqe_index)
323 {
324 struct hw_queue *queue = &my_qp->hw_squeue;
325 struct ehea_swqe *wqe_p;
326
327 *wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_SQ);
328 wqe_p = hw_qeit_get_inc(&my_qp->hw_squeue);
329
330 return wqe_p;
331 }
332
ehea_post_swqe(struct ehea_qp * my_qp,struct ehea_swqe * swqe)333 static inline void ehea_post_swqe(struct ehea_qp *my_qp, struct ehea_swqe *swqe)
334 {
335 iosync();
336 ehea_update_sqa(my_qp, 1);
337 }
338
ehea_poll_rq1(struct ehea_qp * qp,int * wqe_index)339 static inline struct ehea_cqe *ehea_poll_rq1(struct ehea_qp *qp, int *wqe_index)
340 {
341 struct hw_queue *queue = &qp->hw_rqueue1;
342
343 *wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_RQ1);
344 return hw_qeit_get_valid(queue);
345 }
346
ehea_inc_cq(struct ehea_cq * cq)347 static inline void ehea_inc_cq(struct ehea_cq *cq)
348 {
349 hw_qeit_inc(&cq->hw_queue);
350 }
351
ehea_inc_rq1(struct ehea_qp * qp)352 static inline void ehea_inc_rq1(struct ehea_qp *qp)
353 {
354 hw_qeit_inc(&qp->hw_rqueue1);
355 }
356
ehea_poll_cq(struct ehea_cq * my_cq)357 static inline struct ehea_cqe *ehea_poll_cq(struct ehea_cq *my_cq)
358 {
359 return hw_qeit_get_valid(&my_cq->hw_queue);
360 }
361
362 #define EHEA_CQ_REGISTER_ORIG 0
363 #define EHEA_EQ_REGISTER_ORIG 0
364
365 enum ehea_eq_type {
366 EHEA_EQ = 0, /* event queue */
367 EHEA_NEQ /* notification event queue */
368 };
369
370 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
371 enum ehea_eq_type type,
372 const u32 length, const u8 eqe_gen);
373
374 int ehea_destroy_eq(struct ehea_eq *eq);
375
376 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq);
377
378 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter, int cqe,
379 u64 eq_handle, u32 cq_token);
380
381 int ehea_destroy_cq(struct ehea_cq *cq);
382
383 struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter, u32 pd,
384 struct ehea_qp_init_attr *init_attr);
385
386 int ehea_destroy_qp(struct ehea_qp *qp);
387
388 int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr);
389
390 int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
391 struct ehea_mr *shared_mr);
392
393 int ehea_rem_mr(struct ehea_mr *mr);
394
395 u64 ehea_error_data(struct ehea_adapter *adapter, u64 res_handle,
396 u64 *aer, u64 *aerr);
397
398 int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages);
399 int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages);
400 int ehea_create_busmap(void);
401 void ehea_destroy_busmap(void);
402 u64 ehea_map_vaddr(void *caddr);
403
404 #endif /* __EHEA_QMR_H__ */
405