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
  35 #ifndef MTHCA_PROVIDER_H
  36 #define MTHCA_PROVIDER_H
  37
  38 #include <rdma/ib_verbs.h>
  39 #include <rdma/ib_pack.h>
  40
  41 #define MTHCA_MPT_FLAG_ATOMIC        (1 << 14)
  42 #define MTHCA_MPT_FLAG_REMOTE_WRITE  (1 << 13)
  43 #define MTHCA_MPT_FLAG_REMOTE_READ   (1 << 12)
  44 #define MTHCA_MPT_FLAG_LOCAL_WRITE   (1 << 11)
  45 #define MTHCA_MPT_FLAG_LOCAL_READ    (1 << 10)
  46
  47 struct mthca_buf_list {
  48         void *buf;
  49         DECLARE_PCI_UNMAP_ADDR(mapping)
  50 };
  51
  52 union mthca_buf {
  53         struct mthca_buf_list direct;
  54         struct mthca_buf_list *page_list;
  55 };
  56
  57 struct mthca_uar {
  58         unsigned long pfn;
  59         int           index;
  60 };
  61
  62 struct mthca_user_db_table;
  63
  64 struct mthca_ucontext {
  65         struct ib_ucontext          ibucontext;
  66         struct mthca_uar            uar;
  67         struct mthca_user_db_table *db_tab;
  68         int                         reg_mr_warned;
  69 };
  70
  71 struct mthca_mtt;
  72
  73 struct mthca_mr {
  74         struct ib_mr      ibmr;
  75         struct ib_umem   *umem;
  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                         dma_addr_t dma_handle;
  93                 } arbel;
  94         } mem;
  95 };
  96
  97 struct mthca_pd {
  98         struct ib_pd    ibpd;
  99         u32             pd_num;
 100         atomic_t        sqp_count;
 101         struct mthca_mr ntmr;
 102         int             privileged;
 103 };
 104
 105 struct mthca_eq {
 106         struct mthca_dev      *dev;
 107         int                    eqn;
 108         u32                    eqn_mask;
 109         u32                    cons_index;
 110         u16                    msi_x_vector;
 111         u16                    msi_x_entry;
 112         int                    have_irq;
 113         int                    nent;
 114         struct mthca_buf_list *page_list;
 115         struct mthca_mr        mr;
 116         char                   irq_name[IB_DEVICE_NAME_MAX];
 117 };
 118
 119 struct mthca_av;
 120
 121 enum mthca_ah_type {
 122         MTHCA_AH_ON_HCA,
 123         MTHCA_AH_PCI_POOL,
 124         MTHCA_AH_KMALLOC
 125 };
 126
 127 struct mthca_ah {
 128         struct ib_ah       ibah;
 129         enum mthca_ah_type type;
 130         u32                key;
 131         struct mthca_av   *av;
 132         dma_addr_t         avdma;
 133 };
 134
 135 /*
 136  * Quick description of our CQ/QP locking scheme:
 137  *
 138  * We have one global lock that protects dev->cq/qp_table.  Each
 139  * struct mthca_cq/qp also has its own lock.  An individual qp lock
 140  * may be taken inside of an individual cq lock.  Both cqs attached to
 141  * a qp may be locked, with the cq with the lower cqn locked first.
 142  * No other nesting should be done.
 143  *
 144  * Each struct mthca_cq/qp also has an ref count, protected by the
 145  * corresponding table lock.  The pointer from the cq/qp_table to the
 146  * struct counts as one reference.  This reference also is good for
 147  * access through the consumer API, so modifying the CQ/QP etc doesn't
 148  * need to take another reference.  Access to a QP because of a
 149  * completion being polled does not need a reference either.
 150  *
 151  * Finally, each struct mthca_cq/qp has a wait_queue_head_t for the
 152  * destroy function to sleep on.
 153  *
 154  * This means that access from the consumer API requires nothing but
 155  * taking the struct's lock.
 156  *
 157  * Access because of a completion event should go as follows:
 158  * - lock cq/qp_table and look up struct
 159  * - increment ref count in struct
 160  * - drop cq/qp_table lock
 161  * - lock struct, do your thing, and unlock struct
 162  * - decrement ref count; if zero, wake up waiters
 163  *
 164  * To destroy a CQ/QP, we can do the following:
 165  * - lock cq/qp_table
 166  * - remove pointer and decrement ref count
 167  * - unlock cq/qp_table lock
 168  * - wait_event until ref count is zero
 169  *
 170  * It is the consumer's responsibilty to make sure that no QP
 171  * operations (WQE posting or state modification) are pending when a
 172  * QP is destroyed.  Also, the consumer must make sure that calls to
 173  * qp_modify are serialized.  Similarly, the consumer is responsible
 174  * for ensuring that no CQ resize operations are pending when a CQ
 175  * is destroyed.
 176  *
 177  * Possible optimizations (wait for profile data to see if/where we
 178  * have locks bouncing between CPUs):
 179  * - split cq/qp table lock into n separate (cache-aligned) locks,
 180  *   indexed (say) by the page in the table
 181  * - split QP struct lock into three (one for common info, one for the
 182  *   send queue and one for the receive queue)
 183  */
 184
 185 struct mthca_cq_buf {
 186         union mthca_buf         queue;
 187         struct mthca_mr         mr;
 188         int                     is_direct;
 189 };
 190
 191 struct mthca_cq_resize {
 192         struct mthca_cq_buf     buf;
 193         int                     cqe;
 194         enum {
 195                 CQ_RESIZE_ALLOC,
 196                 CQ_RESIZE_READY,
 197                 CQ_RESIZE_SWAPPED
 198         }                       state;
 199 };
 200
 201 struct mthca_cq {
 202         struct ib_cq            ibcq;
 203         spinlock_t              lock;
 204         int                     refcount;
 205         int                     cqn;
 206         u32                     cons_index;
 207         struct mthca_cq_buf     buf;
 208         struct mthca_cq_resize *resize_buf;
 209         int                     is_kernel;
 210
 211         /* Next fields are Arbel only */
 212         int                     set_ci_db_index;
 213         __be32                 *set_ci_db;
 214         int                     arm_db_index;
 215         __be32                 *arm_db;
 216         int                     arm_sn;
 217
 218         wait_queue_head_t       wait;
 219         struct mutex            mutex;
 220 };
 221
 222 struct mthca_srq {
 223         struct ib_srq           ibsrq;
 224         spinlock_t              lock;
 225         int                     refcount;
 226         int                     srqn;
 227         int                     max;
 228         int                     max_gs;
 229         int                     wqe_shift;
 230         int                     first_free;
 231         int                     last_free;
 232         u16                     counter;  /* Arbel only */
 233         int                     db_index; /* Arbel only */
 234         __be32                 *db;       /* Arbel only */
 235         void                   *last;
 236
 237         int                     is_direct;
 238         u64                    *wrid;
 239         union mthca_buf         queue;
 240         struct mthca_mr         mr;
 241
 242         wait_queue_head_t       wait;
 243         struct mutex            mutex;
 244 };
 245
 246 struct mthca_wq {
 247         spinlock_t lock;
 248         int        max;
 249         unsigned   next_ind;
 250         unsigned   last_comp;
 251         unsigned   head;
 252         unsigned   tail;
 253         void      *last;
 254         int        max_gs;
 255         int        wqe_shift;
 256
 257         int        db_index;    /* Arbel only */
 258         __be32    *db;
 259 };
 260
 261 struct mthca_qp {
 262         struct ib_qp           ibqp;
 263         int                    refcount;
 264         u32                    qpn;
 265         int                    is_direct;
 266         u8                     port; /* for SQP and memfree use only */
 267         u8                     alt_port; /* for memfree use only */
 268         u8                     transport;
 269         u8                     state;
 270         u8                     atomic_rd_en;
 271         u8                     resp_depth;
 272
 273         struct mthca_mr        mr;
 274
 275         struct mthca_wq        rq;
 276         struct mthca_wq        sq;
 277         enum ib_sig_type       sq_policy;
 278         int                    send_wqe_offset;
 279         int                    max_inline_data;
 280
 281         u64                   *wrid;
 282         union mthca_buf        queue;
 283
 284         wait_queue_head_t      wait;
 285         struct mutex           mutex;
 286 };
 287
 288 struct mthca_sqp {
 289         struct mthca_qp qp;
 290         int             pkey_index;
 291         u32             qkey;
 292         u32             send_psn;
 293         struct ib_ud_header ud_header;
 294         int             header_buf_size;
 295         void           *header_buf;
 296         dma_addr_t      header_dma;
 297 };
 298
 299 static inline struct mthca_ucontext *to_mucontext(struct ib_ucontext *ibucontext)
 300 {
 301         return container_of(ibucontext, struct mthca_ucontext, ibucontext);
 302 }
 303
 304 static inline struct mthca_fmr *to_mfmr(struct ib_fmr *ibmr)
 305 {
 306         return container_of(ibmr, struct mthca_fmr, ibmr);
 307 }
 308
 309 static inline struct mthca_mr *to_mmr(struct ib_mr *ibmr)
 310 {
 311         return container_of(ibmr, struct mthca_mr, ibmr);
 312 }
 313
 314 static inline struct mthca_pd *to_mpd(struct ib_pd *ibpd)
 315 {
 316         return container_of(ibpd, struct mthca_pd, ibpd);
 317 }
 318
 319 static inline struct mthca_ah *to_mah(struct ib_ah *ibah)
 320 {
 321         return container_of(ibah, struct mthca_ah, ibah);
 322 }
 323
 324 static inline struct mthca_cq *to_mcq(struct ib_cq *ibcq)
 325 {
 326         return container_of(ibcq, struct mthca_cq, ibcq);
 327 }
 328
 329 static inline struct mthca_srq *to_msrq(struct ib_srq *ibsrq)
 330 {
 331         return container_of(ibsrq, struct mthca_srq, ibsrq);
 332 }
 333
 334 static inline struct mthca_qp *to_mqp(struct ib_qp *ibqp)
 335 {
 336         return container_of(ibqp, struct mthca_qp, ibqp);
 337 }
 338
 339 static inline struct mthca_sqp *to_msqp(struct mthca_qp *qp)
 340 {
 341         return container_of(qp, struct mthca_sqp, qp);
 342 }
 343
 344 #endif /* MTHCA_PROVIDER_H */