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   4096UL
  41
  42 /* Some abbreviations used here:
  43  *
  44  * WQE  - Work Queue Entry
  45  * SWQE - Send Work Queue Entry
  46  * RWQE - Receive Work Queue Entry
  47  * CQE  - Completion Queue Entry
  48  * EQE  - Event Queue Entry
  49  * MR   - Memory Region
  50  */
  51
  52 /* Use of WR_ID field for EHEA */
  53 #define EHEA_WR_ID_COUNT   EHEA_BMASK_IBM(0, 19)
  54 #define EHEA_WR_ID_TYPE    EHEA_BMASK_IBM(20, 23)
  55 #define EHEA_SWQE2_TYPE    0x1
  56 #define EHEA_SWQE3_TYPE    0x2
  57 #define EHEA_RWQE2_TYPE    0x3
  58 #define EHEA_RWQE3_TYPE    0x4
  59 #define EHEA_WR_ID_INDEX   EHEA_BMASK_IBM(24, 47)
  60 #define EHEA_WR_ID_REFILL  EHEA_BMASK_IBM(48, 63)
  61
  62 struct ehea_vsgentry {
  63         u64 vaddr;
  64         u32 l_key;
  65         u32 len;
  66 };
  67
  68 /* maximum number of sg entries allowed in a WQE */
  69 #define EHEA_MAX_WQE_SG_ENTRIES         252
  70 #define SWQE2_MAX_IMM                   (0xD0 - 0x30)
  71 #define SWQE3_MAX_IMM                   224
  72
  73 /* tx control flags for swqe */
  74 #define EHEA_SWQE_CRC                   0x8000
  75 #define EHEA_SWQE_IP_CHECKSUM           0x4000
  76 #define EHEA_SWQE_TCP_CHECKSUM          0x2000
  77 #define EHEA_SWQE_TSO                   0x1000
  78 #define EHEA_SWQE_SIGNALLED_COMPLETION  0x0800
  79 #define EHEA_SWQE_VLAN_INSERT           0x0400
  80 #define EHEA_SWQE_IMM_DATA_PRESENT      0x0200
  81 #define EHEA_SWQE_DESCRIPTORS_PRESENT   0x0100
  82 #define EHEA_SWQE_WRAP_CTL_REC          0x0080
  83 #define EHEA_SWQE_WRAP_CTL_FORCE        0x0040
  84 #define EHEA_SWQE_BIND                  0x0020
  85 #define EHEA_SWQE_PURGE                 0x0010
  86
  87 /* sizeof(struct ehea_swqe) less the union */
  88 #define SWQE_HEADER_SIZE                32
  89
  90 struct ehea_swqe {
  91         u64 wr_id;
  92         u16 tx_control;
  93         u16 vlan_tag;
  94         u8 reserved1;
  95         u8 ip_start;
  96         u8 ip_end;
  97         u8 immediate_data_length;
  98         u8 tcp_offset;
  99         u8 reserved2;
 100         u16 tcp_end;
 101         u8 wrap_tag;
 102         u8 descriptors;         /* number of valid descriptors in WQE */
 103         u16 reserved3;
 104         u16 reserved4;
 105         u16 mss;
 106         u32 reserved5;
 107         union {
 108                 /*  Send WQE Format 1 */
 109                 struct {
 110                         struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
 111                 } no_immediate_data;
 112
 113                 /*  Send WQE Format 2 */
 114                 struct {
 115                         struct ehea_vsgentry sg_entry;
 116                         /* 0x30 */
 117                         u8 immediate_data[SWQE2_MAX_IMM];
 118                         /* 0xd0 */
 119                         struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES-1];
 120                 } immdata_desc __attribute__ ((packed));
 121
 122                 /*  Send WQE Format 3 */
 123                 struct {
 124                         u8 immediate_data[SWQE3_MAX_IMM];
 125                 } immdata_nodesc;
 126         } u;
 127 };
 128
 129 struct ehea_rwqe {
 130         u64 wr_id;              /* work request ID */
 131         u8 reserved1[5];
 132         u8 data_segments;
 133         u16 reserved2;
 134         u64 reserved3;
 135         u64 reserved4;
 136         struct ehea_vsgentry sg_list[EHEA_MAX_WQE_SG_ENTRIES];
 137 };
 138
 139 #define EHEA_CQE_VLAN_TAG_XTRACT   0x0400
 140
 141 #define EHEA_CQE_TYPE_RQ           0x60
 142 #define EHEA_CQE_STAT_ERR_MASK     0x721F
 143 #define EHEA_CQE_STAT_FAT_ERR_MASK 0x1F
 144 #define EHEA_CQE_STAT_ERR_TCP      0x4000
 145
 146 struct ehea_cqe {
 147         u64 wr_id;              /* work request ID from WQE */
 148         u8 type;
 149         u8 valid;
 150         u16 status;
 151         u16 reserved1;
 152         u16 num_bytes_transfered;
 153         u16 vlan_tag;
 154         u16 inet_checksum_value;
 155         u8 reserved2;
 156         u8 header_length;
 157         u16 reserved3;
 158         u16 page_offset;
 159         u16 wqe_count;
 160         u32 qp_token;
 161         u32 timestamp;
 162         u32 reserved4;
 163         u64 reserved5[3];
 164 };
 165
 166 #define EHEA_EQE_VALID           EHEA_BMASK_IBM(0, 0)
 167 #define EHEA_EQE_IS_CQE          EHEA_BMASK_IBM(1, 1)
 168 #define EHEA_EQE_IDENTIFIER      EHEA_BMASK_IBM(2, 7)
 169 #define EHEA_EQE_QP_CQ_NUMBER    EHEA_BMASK_IBM(8, 31)
 170 #define EHEA_EQE_QP_TOKEN        EHEA_BMASK_IBM(32, 63)
 171 #define EHEA_EQE_CQ_TOKEN        EHEA_BMASK_IBM(32, 63)
 172 #define EHEA_EQE_KEY             EHEA_BMASK_IBM(32, 63)
 173 #define EHEA_EQE_PORT_NUMBER     EHEA_BMASK_IBM(56, 63)
 174 #define EHEA_EQE_EQ_NUMBER       EHEA_BMASK_IBM(48, 63)
 175 #define EHEA_EQE_SM_ID           EHEA_BMASK_IBM(48, 63)
 176 #define EHEA_EQE_SM_MECH_NUMBER  EHEA_BMASK_IBM(48, 55)
 177 #define EHEA_EQE_SM_PORT_NUMBER  EHEA_BMASK_IBM(56, 63)
 178
 179 struct ehea_eqe {
 180         u64 entry;
 181 };
 182
 183 static inline void *hw_qeit_calc(struct hw_queue *queue, u64 q_offset)
 184 {
 185         struct ehea_page *current_page;
 186
 187         if (q_offset >= queue->queue_length)
 188                 q_offset -= queue->queue_length;
 189         current_page = (queue->queue_pages)[q_offset >> EHEA_PAGESHIFT];
 190         return &current_page->entries[q_offset & (EHEA_PAGESIZE - 1)];
 191 }
 192
 193 static inline void *hw_qeit_get(struct hw_queue *queue)
 194 {
 195         return hw_qeit_calc(queue, queue->current_q_offset);
 196 }
 197
 198 static inline void hw_qeit_inc(struct hw_queue *queue)
 199 {
 200         queue->current_q_offset += queue->qe_size;
 201         if (queue->current_q_offset >= queue->queue_length) {
 202                 queue->current_q_offset = 0;
 203                 /* toggle the valid flag */
 204                 queue->toggle_state = (~queue->toggle_state) & 1;
 205         }
 206 }
 207
 208 static inline void *hw_qeit_get_inc(struct hw_queue *queue)
 209 {
 210         void *retvalue = hw_qeit_get(queue);
 211         hw_qeit_inc(queue);
 212         return retvalue;
 213 }
 214
 215 static inline void *hw_qeit_get_inc_valid(struct hw_queue *queue)
 216 {
 217         struct ehea_cqe *retvalue = hw_qeit_get(queue);
 218         u8 valid = retvalue->valid;
 219         void *pref;
 220
 221         if ((valid >> 7) == (queue->toggle_state & 1)) {
 222                 /* this is a good one */
 223                 hw_qeit_inc(queue);
 224                 pref = hw_qeit_calc(queue, queue->current_q_offset);
 225                 prefetch(pref);
 226                 prefetch(pref + 128);
 227         } else
 228                 retvalue = NULL;
 229         return retvalue;
 230 }
 231
 232 static inline void *hw_qeit_get_valid(struct hw_queue *queue)
 233 {
 234         struct ehea_cqe *retvalue = hw_qeit_get(queue);
 235         void *pref;
 236         u8 valid;
 237
 238         pref = hw_qeit_calc(queue, queue->current_q_offset);
 239         prefetch(pref);
 240         prefetch(pref + 128);
 241         prefetch(pref + 256);
 242         valid = retvalue->valid;
 243         if (!((valid >> 7) == (queue->toggle_state & 1)))
 244                 retvalue = NULL;
 245         return retvalue;
 246 }
 247
 248 static inline void *hw_qeit_reset(struct hw_queue *queue)
 249 {
 250         queue->current_q_offset = 0;
 251         return hw_qeit_get(queue);
 252 }
 253
 254 static inline void *hw_qeit_eq_get_inc(struct hw_queue *queue)
 255 {
 256         u64 last_entry_in_q = queue->queue_length - queue->qe_size;
 257         void *retvalue;
 258
 259         retvalue = hw_qeit_get(queue);
 260         queue->current_q_offset += queue->qe_size;
 261         if (queue->current_q_offset > last_entry_in_q) {
 262                 queue->current_q_offset = 0;
 263                 queue->toggle_state = (~queue->toggle_state) & 1;
 264         }
 265         return retvalue;
 266 }
 267
 268 static inline void *hw_eqit_eq_get_inc_valid(struct hw_queue *queue)
 269 {
 270         void *retvalue = hw_qeit_get(queue);
 271         u32 qe = *(u8*)retvalue;
 272         if ((qe >> 7) == (queue->toggle_state & 1))
 273                 hw_qeit_eq_get_inc(queue);
 274         else
 275                 retvalue = NULL;
 276         return retvalue;
 277 }
 278
 279 static inline struct ehea_rwqe *ehea_get_next_rwqe(struct ehea_qp *qp,
 280                                                    int rq_nr)
 281 {
 282         struct hw_queue *queue;
 283
 284         if (rq_nr == 1)
 285                 queue = &qp->hw_rqueue1;
 286         else if (rq_nr == 2)
 287                 queue = &qp->hw_rqueue2;
 288         else
 289                 queue = &qp->hw_rqueue3;
 290
 291         return hw_qeit_get_inc(queue);
 292 }
 293
 294 static inline struct ehea_swqe *ehea_get_swqe(struct ehea_qp *my_qp,
 295                                               int *wqe_index)
 296 {
 297         struct hw_queue *queue = &my_qp->hw_squeue;
 298         struct ehea_swqe *wqe_p;
 299
 300         *wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_SQ);
 301         wqe_p = hw_qeit_get_inc(&my_qp->hw_squeue);
 302
 303         return wqe_p;
 304 }
 305
 306 static inline void ehea_post_swqe(struct ehea_qp *my_qp, struct ehea_swqe *swqe)
 307 {
 308         iosync();
 309         ehea_update_sqa(my_qp, 1);
 310 }
 311
 312 static inline struct ehea_cqe *ehea_poll_rq1(struct ehea_qp *qp, int *wqe_index)
 313 {
 314         struct hw_queue *queue = &qp->hw_rqueue1;
 315
 316         *wqe_index = (queue->current_q_offset) >> (7 + EHEA_SG_RQ1);
 317         return hw_qeit_get_valid(queue);
 318 }
 319
 320 static inline void ehea_inc_rq1(struct ehea_qp *qp)
 321 {
 322         hw_qeit_inc(&qp->hw_rqueue1);
 323 }
 324
 325 static inline struct ehea_cqe *ehea_poll_cq(struct ehea_cq *my_cq)
 326 {
 327         return hw_qeit_get_inc_valid(&my_cq->hw_queue);
 328 }
 329
 330 #define EHEA_CQ_REGISTER_ORIG 0
 331 #define EHEA_EQ_REGISTER_ORIG 0
 332
 333 enum ehea_eq_type {
 334         EHEA_EQ = 0,            /* event queue              */
 335         EHEA_NEQ                /* notification event queue */
 336 };
 337
 338 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
 339                                enum ehea_eq_type type,
 340                                const u32 length, const u8 eqe_gen);
 341
 342 int ehea_destroy_eq(struct ehea_eq *eq);
 343
 344 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq);
 345
 346 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter, int cqe,
 347                                u64 eq_handle, u32 cq_token);
 348
 349 int ehea_destroy_cq(struct ehea_cq *cq);
 350
 351 struct ehea_qp *ehea_create_qp(struct ehea_adapter * adapter, u32 pd,
 352                                struct ehea_qp_init_attr *init_attr);
 353
 354 int ehea_destroy_qp(struct ehea_qp *qp);
 355
 356 int ehea_reg_mr_adapter(struct ehea_adapter *adapter);
 357
 358 #endif  /* __EHEA_QMR_H__ */