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 };
  71
  72 struct mthca_mtt;
  73
  74 struct mthca_mr {
  75         struct ib_mr      ibmr;
  76         struct mthca_mtt *mtt;
  77 };
  78
  79 struct mthca_fmr {
  80         struct ib_fmr      ibmr;
  81         struct ib_fmr_attr attr;
  82         struct mthca_mtt  *mtt;
  83         int                maps;
  84         union {
  85                 struct {
  86                         struct mthca_mpt_entry __iomem *mpt;
  87                         u64 __iomem *mtts;
  88                 } tavor;
  89                 struct {
  90                         struct mthca_mpt_entry *mpt;
  91                         __be64 *mtts;
  92                 } arbel;
  93         } mem;
  94 };
  95
  96 struct mthca_pd {
  97         struct ib_pd    ibpd;
  98         u32             pd_num;
  99         atomic_t        sqp_count;
 100         struct mthca_mr ntmr;
 101         int             privileged;
 102 };
 103
 104 struct mthca_eq {
 105         struct mthca_dev      *dev;
 106         int                    eqn;
 107         u32                    eqn_mask;
 108         u32                    cons_index;
 109         u16                    msi_x_vector;
 110         u16                    msi_x_entry;
 111         int                    have_irq;
 112         int                    nent;
 113         struct mthca_buf_list *page_list;
 114         struct mthca_mr        mr;
 115 };
 116
 117 struct mthca_av;
 118
 119 enum mthca_ah_type {
 120         MTHCA_AH_ON_HCA,
 121         MTHCA_AH_PCI_POOL,
 122         MTHCA_AH_KMALLOC
 123 };
 124
 125 struct mthca_ah {
 126         struct ib_ah       ibah;
 127         enum mthca_ah_type type;
 128         u32                key;
 129         struct mthca_av   *av;
 130         dma_addr_t         avdma;
 131 };
 132
 133 /*
 134  * Quick description of our CQ/QP locking scheme:
 135  *
 136  * We have one global lock that protects dev->cq/qp_table.  Each
 137  * struct mthca_cq/qp also has its own lock.  An individual qp lock
 138  * may be taken inside of an individual cq lock.  Both cqs attached to
 139  * a qp may be locked, with the send cq locked first.  No other
 140  * nesting should be done.
 141  *
 142  * Each struct mthca_cq/qp also has an ref count, protected by the
 143  * corresponding table lock.  The pointer from the cq/qp_table to the
 144  * struct counts as one reference.  This reference also is good for
 145  * access through the consumer API, so modifying the CQ/QP etc doesn't
 146  * need to take another reference.  Access to a QP because of a
 147  * completion being polled does not need a reference either.
 148  *
 149  * Finally, each struct mthca_cq/qp has a wait_queue_head_t for the
 150  * destroy function to sleep on.
 151  *
 152  * This means that access from the consumer API requires nothing but
 153  * taking the struct's lock.
 154  *
 155  * Access because of a completion event should go as follows:
 156  * - lock cq/qp_table and look up struct
 157  * - increment ref count in struct
 158  * - drop cq/qp_table lock
 159  * - lock struct, do your thing, and unlock struct
 160  * - decrement ref count; if zero, wake up waiters
 161  *
 162  * To destroy a CQ/QP, we can do the following:
 163  * - lock cq/qp_table
 164  * - remove pointer and decrement ref count
 165  * - unlock cq/qp_table lock
 166  * - wait_event until ref count is zero
 167  *
 168  * It is the consumer's responsibilty to make sure that no QP
 169  * operations (WQE posting or state modification) are pending when a
 170  * QP is destroyed.  Also, the consumer must make sure that calls to
 171  * qp_modify are serialized.  Similarly, the consumer is responsible
 172  * for ensuring that no CQ resize operations are pending when a CQ
 173  * is destroyed.
 174  *
 175  * Possible optimizations (wait for profile data to see if/where we
 176  * have locks bouncing between CPUs):
 177  * - split cq/qp table lock into n separate (cache-aligned) locks,
 178  *   indexed (say) by the page in the table
 179  * - split QP struct lock into three (one for common info, one for the
 180  *   send queue and one for the receive queue)
 181  */
 182
 183 struct mthca_cq_buf {
 184         union mthca_buf         queue;
 185         struct mthca_mr         mr;
 186         int                     is_direct;
 187 };
 188
 189 struct mthca_cq_resize {
 190         struct mthca_cq_buf     buf;
 191         int                     cqe;
 192         enum {
 193                 CQ_RESIZE_ALLOC,
 194                 CQ_RESIZE_READY,
 195                 CQ_RESIZE_SWAPPED
 196         }                       state;
 197 };
 198
 199 struct mthca_cq {
 200         struct ib_cq            ibcq;
 201         spinlock_t              lock;
 202         int                     refcount;
 203         int                     cqn;
 204         u32                     cons_index;
 205         struct mthca_cq_buf     buf;
 206         struct mthca_cq_resize *resize_buf;
 207         int                     is_kernel;
 208
 209         /* Next fields are Arbel only */
 210         int                     set_ci_db_index;
 211         __be32                 *set_ci_db;
 212         int                     arm_db_index;
 213         __be32                 *arm_db;
 214         int                     arm_sn;
 215
 216         wait_queue_head_t       wait;
 217         struct mutex            mutex;
 218 };
 219
 220 struct mthca_srq {
 221         struct ib_srq           ibsrq;
 222         spinlock_t              lock;
 223         int                     refcount;
 224         int                     srqn;
 225         int                     max;
 226         int                     max_gs;
 227         int                     wqe_shift;
 228         int                     first_free;
 229         int                     last_free;
 230         u16                     counter;  /* Arbel only */
 231         int                     db_index; /* Arbel only */
 232         __be32                 *db;       /* Arbel only */
 233         void                   *last;
 234
 235         int                     is_direct;
 236         u64                    *wrid;
 237         union mthca_buf         queue;
 238         struct mthca_mr         mr;
 239
 240         wait_queue_head_t       wait;
 241         struct mutex            mutex;
 242 };
 243
 244 struct mthca_wq {
 245         spinlock_t lock;
 246         int        max;
 247         unsigned   next_ind;
 248         unsigned   last_comp;
 249         unsigned   head;
 250         unsigned   tail;
 251         void      *last;
 252         int        max_gs;
 253         int        wqe_shift;
 254
 255         int        db_index;    /* Arbel only */
 256         __be32    *db;
 257 };
 258
 259 struct mthca_qp {
 260         struct ib_qp           ibqp;
 261         int                    refcount;
 262         u32                    qpn;
 263         int                    is_direct;
 264         u8                     port; /* for SQP and memfree use only */
 265         u8                     alt_port; /* for memfree use only */
 266         u8                     transport;
 267         u8                     state;
 268         u8                     atomic_rd_en;
 269         u8                     resp_depth;
 270
 271         struct mthca_mr        mr;
 272
 273         struct mthca_wq        rq;
 274         struct mthca_wq        sq;
 275         enum ib_sig_type       sq_policy;
 276         int                    send_wqe_offset;
 277         int                    max_inline_data;
 278
 279         u64                   *wrid;
 280         union mthca_buf        queue;
 281
 282         wait_queue_head_t      wait;
 283         struct mutex           mutex;
 284 };
 285
 286 struct mthca_sqp {
 287         struct mthca_qp qp;
 288         int             pkey_index;
 289         u32             qkey;
 290         u32             send_psn;
 291         struct ib_ud_header ud_header;
 292         int             header_buf_size;
 293         void           *header_buf;
 294         dma_addr_t      header_dma;
 295 };
 296
 297 static inline struct mthca_ucontext *to_mucontext(struct ib_ucontext *ibucontext)
 298 {
 299         return container_of(ibucontext, struct mthca_ucontext, ibucontext);
 300 }
 301
 302 static inline struct mthca_fmr *to_mfmr(struct ib_fmr *ibmr)
 303 {
 304         return container_of(ibmr, struct mthca_fmr, ibmr);
 305 }
 306
 307 static inline struct mthca_mr *to_mmr(struct ib_mr *ibmr)
 308 {
 309         return container_of(ibmr, struct mthca_mr, ibmr);
 310 }
 311
 312 static inline struct mthca_pd *to_mpd(struct ib_pd *ibpd)
 313 {
 314         return container_of(ibpd, struct mthca_pd, ibpd);
 315 }
 316
 317 static inline struct mthca_ah *to_mah(struct ib_ah *ibah)
 318 {
 319         return container_of(ibah, struct mthca_ah, ibah);
 320 }
 321
 322 static inline struct mthca_cq *to_mcq(struct ib_cq *ibcq)
 323 {
 324         return container_of(ibcq, struct mthca_cq, ibcq);
 325 }
 326
 327 static inline struct mthca_srq *to_msrq(struct ib_srq *ibsrq)
 328 {
 329         return container_of(ibsrq, struct mthca_srq, ibsrq);
 330 }
 331
 332 static inline struct mthca_qp *to_mqp(struct ib_qp *ibqp)
 333 {
 334         return container_of(ibqp, struct mthca_qp, ibqp);
 335 }
 336
 337 static inline struct mthca_sqp *to_msqp(struct mthca_qp *qp)
 338 {
 339         return container_of(qp, struct mthca_sqp, qp);
 340 }
 341
 342 #endif /* MTHCA_PROVIDER_H */