drivers/infiniband/hw/mthca/mthca_provider.h

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 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 atomic_t ref count.  The
 143  * pointer from the cq/qp_table to the struct counts as one reference.
 144  * This reference also is good for access through the consumer API, so
 145  * modifying the CQ/QP etc doesn't need to take another reference.
 146  * Access because of a completion being polled does need a reference.
 147  *
 148  * Finally, each struct mthca_cq/qp has a wait_queue_head_t for the
 149  * destroy function to sleep on.
 150  *
 151  * This means that access from the consumer API requires nothing but
 152  * taking the struct's lock.
 153  *
 154  * Access because of a completion event should go as follows:
 155  * - lock cq/qp_table and look up struct
 156  * - increment ref count in struct
 157  * - drop cq/qp_table lock
 158  * - lock struct, do your thing, and unlock struct
 159  * - decrement ref count; if zero, wake up waiters
 160  *
 161  * To destroy a CQ/QP, we can do the following:
 162  * - lock cq/qp_table, remove pointer, unlock cq/qp_table lock
 163  * - decrement ref count
 164  * - wait_event until ref count is zero
 165  *
 166  * It is the consumer's responsibilty to make sure that no QP
 167  * operations (WQE posting or state modification) are pending when the
 168  * QP is destroyed.  Also, the consumer must make sure that calls to
 169  * qp_modify are serialized.
 170  *
 171  * Possible optimizations (wait for profile data to see if/where we
 172  * have locks bouncing between CPUs):
 173  * - split cq/qp table lock into n separate (cache-aligned) locks,
 174  *   indexed (say) by the page in the table
 175  * - split QP struct lock into three (one for common info, one for the
 176  *   send queue and one for the receive queue)
 177  */
 178
 179 struct mthca_cq {
 180         struct ib_cq           ibcq;
 181         spinlock_t             lock;
 182         atomic_t               refcount;
 183         int                    cqn;
 184         u32                    cons_index;
 185         int                    is_direct;
 186         int                    is_kernel;
 187
 188         /* Next fields are Arbel only */
 189         int                    set_ci_db_index;
 190         __be32                *set_ci_db;
 191         int                    arm_db_index;
 192         __be32                *arm_db;
 193         int                    arm_sn;
 194
 195         union mthca_buf        queue;
 196         struct mthca_mr        mr;
 197         wait_queue_head_t      wait;
 198 };
 199
 200 struct mthca_srq {
 201         struct ib_srq           ibsrq;
 202         spinlock_t              lock;
 203         atomic_t                refcount;
 204         int                     srqn;
 205         int                     max;
 206         int                     max_gs;
 207         int                     wqe_shift;
 208         int                     first_free;
 209         int                     last_free;
 210         u16                     counter;  /* Arbel only */
 211         int                     db_index; /* Arbel only */
 212         __be32                 *db;       /* Arbel only */
 213         void                   *last;
 214
 215         int                     is_direct;
 216         u64                    *wrid;
 217         union mthca_buf         queue;
 218         struct mthca_mr         mr;
 219
 220         wait_queue_head_t       wait;
 221 };
 222
 223 struct mthca_wq {
 224         spinlock_t lock;
 225         int        max;
 226         unsigned   next_ind;
 227         unsigned   last_comp;
 228         unsigned   head;
 229         unsigned   tail;
 230         void      *last;
 231         int        max_gs;
 232         int        wqe_shift;
 233
 234         int        db_index;    /* Arbel only */
 235         __be32    *db;
 236 };
 237
 238 struct mthca_qp {
 239         struct ib_qp           ibqp;
 240         atomic_t               refcount;
 241         u32                    qpn;
 242         int                    is_direct;
 243         u8                     transport;
 244         u8                     state;
 245         u8                     atomic_rd_en;
 246         u8                     resp_depth;
 247
 248         struct mthca_mr        mr;
 249
 250         struct mthca_wq        rq;
 251         struct mthca_wq        sq;
 252         enum ib_sig_type       sq_policy;
 253         int                    send_wqe_offset;
 254
 255         u64                   *wrid;
 256         union mthca_buf        queue;
 257
 258         wait_queue_head_t      wait;
 259 };
 260
 261 struct mthca_sqp {
 262         struct mthca_qp qp;
 263         int             port;
 264         int             pkey_index;
 265         u32             qkey;
 266         u32             send_psn;
 267         struct ib_ud_header ud_header;
 268         int             header_buf_size;
 269         void           *header_buf;
 270         dma_addr_t      header_dma;
 271 };
 272
 273 static inline struct mthca_ucontext *to_mucontext(struct ib_ucontext *ibucontext)
 274 {
 275         return container_of(ibucontext, struct mthca_ucontext, ibucontext);
 276 }
 277
 278 static inline struct mthca_fmr *to_mfmr(struct ib_fmr *ibmr)
 279 {
 280         return container_of(ibmr, struct mthca_fmr, ibmr);
 281 }
 282
 283 static inline struct mthca_mr *to_mmr(struct ib_mr *ibmr)
 284 {
 285         return container_of(ibmr, struct mthca_mr, ibmr);
 286 }
 287
 288 static inline struct mthca_pd *to_mpd(struct ib_pd *ibpd)
 289 {
 290         return container_of(ibpd, struct mthca_pd, ibpd);
 291 }
 292
 293 static inline struct mthca_ah *to_mah(struct ib_ah *ibah)
 294 {
 295         return container_of(ibah, struct mthca_ah, ibah);
 296 }
 297
 298 static inline struct mthca_cq *to_mcq(struct ib_cq *ibcq)
 299 {
 300         return container_of(ibcq, struct mthca_cq, ibcq);
 301 }
 302
 303 static inline struct mthca_srq *to_msrq(struct ib_srq *ibsrq)
 304 {
 305         return container_of(ibsrq, struct mthca_srq, ibsrq);
 306 }
 307
 308 static inline struct mthca_qp *to_mqp(struct ib_qp *ibqp)
 309 {
 310         return container_of(ibqp, struct mthca_qp, ibqp);
 311 }
 312
 313 static inline struct mthca_sqp *to_msqp(struct mthca_qp *qp)
 314 {
 315         return container_of(qp, struct mthca_sqp, qp);
 316 }
 317
 318 #endif /* MTHCA_PROVIDER_H */