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 #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 &current_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__ */