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