drivers/net/ehea/ehea_qmr.h

   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
  68 struct 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
  96 struct 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
 135 struct 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
 154 struct 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
 187 struct 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
 194 static 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 &current_page->entries[q_offset & (EHEA_PAGESIZE - 1)];
 202 }
 203
 204 static inline void *hw_qeit_get(struct hw_queue *queue)
 205 {
 206         return hw_qeit_calc(queue, queue->current_q_offset);
 207 }
 208
 209 static 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
 219 static 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
 226 static 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
 243 static 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
 259 static inline void *hw_qeit_reset(struct hw_queue *queue)
 260 {
 261         queue->current_q_offset = 0;
 262         return hw_qeit_get(queue);
 263 }
 264
 265 static 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
 279 static 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
 290 static 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
 305 static 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
 317 static 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
 323 static 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
 331 static inline void ehea_inc_cq(struct ehea_cq *cq)
 332 {
 333         hw_qeit_inc(&cq->hw_queue);
 334 }
 335
 336 static inline void ehea_inc_rq1(struct ehea_qp *qp)
 337 {
 338         hw_qeit_inc(&qp->hw_rqueue1);
 339 }
 340
 341 static 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
 349 enum ehea_eq_type {
 350         EHEA_EQ = 0,            /* event queue              */
 351         EHEA_NEQ                /* notification event queue */
 352 };
 353
 354 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
 355                                enum ehea_eq_type type,
 356                                const u32 length, const u8 eqe_gen);
 357
 358 int ehea_destroy_eq(struct ehea_eq *eq);
 359
 360 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq);
 361
 362 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter, int cqe,
 363                                u64 eq_handle, u32 cq_token);
 364
 365 int ehea_destroy_cq(struct ehea_cq *cq);
 366
 367 struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter, u32 pd,
 368                                struct ehea_qp_init_attr *init_attr);
 369
 370 int ehea_destroy_qp(struct ehea_qp *qp);
 371
 372 int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr);
 373
 374 int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
 375                  struct ehea_mr *shared_mr);
 376
 377 int ehea_rem_mr(struct ehea_mr *mr);
 378
 379 void ehea_error_data(struct ehea_adapter *adapter, u64 res_handle);
 380
 381 int ehea_create_busmap(void);
 382 void ehea_destroy_busmap(void);
 383 u64 ehea_map_vaddr(void *caddr);
 384
 385 #endif  /* __EHEA_QMR_H__ */