drivers/infiniband/hw/mthca/mthca_provider.h

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: mthca_provider.h 1349 2004-12-16 21:09:43Z roland $
  35  */
  36
  37 #ifndef MTHCA_PROVIDER_H
  38 #define MTHCA_PROVIDER_H
  39
  40 #include <rdma/ib_verbs.h>
  41 #include <rdma/ib_pack.h>
  42
  43 #define MTHCA_MPT_FLAG_ATOMIC        (1 << 14)
  44 #define MTHCA_MPT_FLAG_REMOTE_WRITE  (1 << 13)
  45 #define MTHCA_MPT_FLAG_REMOTE_READ   (1 << 12)
  46 #define MTHCA_MPT_FLAG_LOCAL_WRITE   (1 << 11)
  47 #define MTHCA_MPT_FLAG_LOCAL_READ    (1 << 10)
  48
  49 struct mthca_buf_list {
  50         void *buf;
  51         DECLARE_PCI_UNMAP_ADDR(mapping)
  52 };
  53
  54 union mthca_buf {
  55         struct mthca_buf_list direct;
  56         struct mthca_buf_list *page_list;
  57 };
  58
  59 struct mthca_uar {
  60         unsigned long pfn;
  61         int           index;
  62 };
  63
  64 struct mthca_user_db_table;
  65
  66 struct mthca_ucontext {
  67         struct ib_ucontext          ibucontext;
  68         struct mthca_uar            uar;
  69         struct mthca_user_db_table *db_tab;
  70         int                         reg_mr_warned;
  71 };
  72
  73 struct mthca_mtt;
  74
  75 struct mthca_mr {
  76         struct ib_mr      ibmr;
  77         struct ib_umem   *umem;
  78         struct mthca_mtt *mtt;
  79 };
  80
  81 struct mthca_fmr {
  82         struct ib_fmr      ibmr;
  83         struct ib_fmr_attr attr;
  84         struct mthca_mtt  *mtt;
  85         int                maps;
  86         union {
  87                 struct {
  88                         struct mthca_mpt_entry __iomem *mpt;
  89                         u64 __iomem *mtts;
  90                 } tavor;
  91                 struct {
  92                         struct mthca_mpt_entry *mpt;
  93                         __be64 *mtts;
  94                         dma_addr_t dma_handle;
  95                 } arbel;
  96         } mem;
  97 };
  98
  99 struct mthca_pd {
 100         struct ib_pd    ibpd;
 101         u32             pd_num;
 102         atomic_t        sqp_count;
 103         struct mthca_mr ntmr;
 104         int             privileged;
 105 };
 106
 107 struct mthca_eq {
 108         struct mthca_dev      *dev;
 109         int                    eqn;
 110         u32                    eqn_mask;
 111         u32                    cons_index;
 112         u16                    msi_x_vector;
 113         u16                    msi_x_entry;
 114         int                    have_irq;
 115         int                    nent;
 116         struct mthca_buf_list *page_list;
 117         struct mthca_mr        mr;
 118 };
 119
 120 struct mthca_av;
 121
 122 enum mthca_ah_type {
 123         MTHCA_AH_ON_HCA,
 124         MTHCA_AH_PCI_POOL,
 125         MTHCA_AH_KMALLOC
 126 };
 127
 128 struct mthca_ah {
 129         struct ib_ah       ibah;
 130         enum mthca_ah_type type;
 131         u32                key;
 132         struct mthca_av   *av;
 133         dma_addr_t         avdma;
 134 };
 135
 136 /*
 137  * Quick description of our CQ/QP locking scheme:
 138  *
 139  * We have one global lock that protects dev->cq/qp_table.  Each
 140  * struct mthca_cq/qp also has its own lock.  An individual qp lock
 141  * may be taken inside of an individual cq lock.  Both cqs attached to
 142  * a qp may be locked, with the cq with the lower cqn locked first.
 143  * No other nesting should be done.
 144  *
 145  * Each struct mthca_cq/qp also has an ref count, protected by the
 146  * corresponding table lock.  The pointer from the cq/qp_table to the
 147  * struct counts as one reference.  This reference also is good for
 148  * access through the consumer API, so modifying the CQ/QP etc doesn't
 149  * need to take another reference.  Access to a QP because of a
 150  * completion being polled does not need a reference either.
 151  *
 152  * Finally, each struct mthca_cq/qp has a wait_queue_head_t for the
 153  * destroy function to sleep on.
 154  *
 155  * This means that access from the consumer API requires nothing but
 156  * taking the struct's lock.
 157  *
 158  * Access because of a completion event should go as follows:
 159  * - lock cq/qp_table and look up struct
 160  * - increment ref count in struct
 161  * - drop cq/qp_table lock
 162  * - lock struct, do your thing, and unlock struct
 163  * - decrement ref count; if zero, wake up waiters
 164  *
 165  * To destroy a CQ/QP, we can do the following:
 166  * - lock cq/qp_table
 167  * - remove pointer and decrement ref count
 168  * - unlock cq/qp_table lock
 169  * - wait_event until ref count is zero
 170  *
 171  * It is the consumer's responsibilty to make sure that no QP
 172  * operations (WQE posting or state modification) are pending when a
 173  * QP is destroyed.  Also, the consumer must make sure that calls to
 174  * qp_modify are serialized.  Similarly, the consumer is responsible
 175  * for ensuring that no CQ resize operations are pending when a CQ
 176  * is destroyed.
 177  *
 178  * Possible optimizations (wait for profile data to see if/where we
 179  * have locks bouncing between CPUs):
 180  * - split cq/qp table lock into n separate (cache-aligned) locks,
 181  *   indexed (say) by the page in the table
 182  * - split QP struct lock into three (one for common info, one for the
 183  *   send queue and one for the receive queue)
 184  */
 185
 186 struct mthca_cq_buf {
 187         union mthca_buf         queue;
 188         struct mthca_mr         mr;
 189         int                     is_direct;
 190 };
 191
 192 struct mthca_cq_resize {
 193         struct mthca_cq_buf     buf;
 194         int                     cqe;
 195         enum {
 196                 CQ_RESIZE_ALLOC,
 197                 CQ_RESIZE_READY,
 198                 CQ_RESIZE_SWAPPED
 199         }                       state;
 200 };
 201
 202 struct mthca_cq {
 203         struct ib_cq            ibcq;
 204         spinlock_t              lock;
 205         int                     refcount;
 206         int                     cqn;
 207         u32                     cons_index;
 208         struct mthca_cq_buf     buf;
 209         struct mthca_cq_resize *resize_buf;
 210         int                     is_kernel;
 211
 212         /* Next fields are Arbel only */
 213         int                     set_ci_db_index;
 214         __be32                 *set_ci_db;
 215         int                     arm_db_index;
 216         __be32                 *arm_db;
 217         int                     arm_sn;
 218
 219         wait_queue_head_t       wait;
 220         struct mutex            mutex;
 221 };
 222
 223 struct mthca_srq {
 224         struct ib_srq           ibsrq;
 225         spinlock_t              lock;
 226         int                     refcount;
 227         int                     srqn;
 228         int                     max;
 229         int                     max_gs;
 230         int                     wqe_shift;
 231         int                     first_free;
 232         int                     last_free;
 233         u16                     counter;  /* Arbel only */
 234         int                     db_index; /* Arbel only */
 235         __be32                 *db;       /* Arbel only */
 236         void                   *last;
 237
 238         int                     is_direct;
 239         u64                    *wrid;
 240         union mthca_buf         queue;
 241         struct mthca_mr         mr;
 242
 243         wait_queue_head_t       wait;
 244         struct mutex            mutex;
 245 };
 246
 247 struct mthca_wq {
 248         spinlock_t lock;
 249         int        max;
 250         unsigned   next_ind;
 251         unsigned   last_comp;
 252         unsigned   head;
 253         unsigned   tail;
 254         void      *last;
 255         int        max_gs;
 256         int        wqe_shift;
 257
 258         int        db_index;    /* Arbel only */
 259         __be32    *db;
 260 };
 261
 262 struct mthca_qp {
 263         struct ib_qp           ibqp;
 264         int                    refcount;
 265         u32                    qpn;
 266         int                    is_direct;
 267         u8                     port; /* for SQP and memfree use only */
 268         u8                     alt_port; /* for memfree use only */
 269         u8                     transport;
 270         u8                     state;
 271         u8                     atomic_rd_en;
 272         u8                     resp_depth;
 273
 274         struct mthca_mr        mr;
 275
 276         struct mthca_wq        rq;
 277         struct mthca_wq        sq;
 278         enum ib_sig_type       sq_policy;
 279         int                    send_wqe_offset;
 280         int                    max_inline_data;
 281
 282         u64                   *wrid;
 283         union mthca_buf        queue;
 284
 285         wait_queue_head_t      wait;
 286         struct mutex           mutex;
 287 };
 288
 289 struct mthca_sqp {
 290         struct mthca_qp qp;
 291         int             pkey_index;
 292         u32             qkey;
 293         u32             send_psn;
 294         struct ib_ud_header ud_header;
 295         int             header_buf_size;
 296         void           *header_buf;
 297         dma_addr_t      header_dma;
 298 };
 299
 300 static inline struct mthca_ucontext *to_mucontext(struct ib_ucontext *ibucontext)
 301 {
 302         return container_of(ibucontext, struct mthca_ucontext, ibucontext);
 303 }
 304
 305 static inline struct mthca_fmr *to_mfmr(struct ib_fmr *ibmr)
 306 {
 307         return container_of(ibmr, struct mthca_fmr, ibmr);
 308 }
 309
 310 static inline struct mthca_mr *to_mmr(struct ib_mr *ibmr)
 311 {
 312         return container_of(ibmr, struct mthca_mr, ibmr);
 313 }
 314
 315 static inline struct mthca_pd *to_mpd(struct ib_pd *ibpd)
 316 {
 317         return container_of(ibpd, struct mthca_pd, ibpd);
 318 }
 319
 320 static inline struct mthca_ah *to_mah(struct ib_ah *ibah)
 321 {
 322         return container_of(ibah, struct mthca_ah, ibah);
 323 }
 324
 325 static inline struct mthca_cq *to_mcq(struct ib_cq *ibcq)
 326 {
 327         return container_of(ibcq, struct mthca_cq, ibcq);
 328 }
 329
 330 static inline struct mthca_srq *to_msrq(struct ib_srq *ibsrq)
 331 {
 332         return container_of(ibsrq, struct mthca_srq, ibsrq);
 333 }
 334
 335 static inline struct mthca_qp *to_mqp(struct ib_qp *ibqp)
 336 {
 337         return container_of(ibqp, struct mthca_qp, ibqp);
 338 }
 339
 340 static inline struct mthca_sqp *to_msqp(struct mthca_qp *qp)
 341 {
 342         return container_of(qp, struct mthca_sqp, qp);
 343 }
 344
 345 #endif /* MTHCA_PROVIDER_H */