drivers/infiniband/hw/mthca/mthca_provider.h

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: mthca_provider.h 1349 2004-12-16 21:09:43Z roland $
  33  */
  34
  35 #ifndef MTHCA_PROVIDER_H
  36 #define MTHCA_PROVIDER_H
  37
  38 #include <ib_verbs.h>
  39 #include <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 struct mthca_uar {
  53         unsigned long pfn;
  54         int           index;
  55 };
  56
  57 struct mthca_mr {
  58         struct ib_mr ibmr;
  59         int order;
  60         u32 first_seg;
  61 };
  62
  63 struct mthca_pd {
  64         struct ib_pd    ibpd;
  65         u32             pd_num;
  66         atomic_t        sqp_count;
  67         struct mthca_mr ntmr;
  68 };
  69
  70 struct mthca_eq {
  71         struct mthca_dev      *dev;
  72         int                    eqn;
  73         u32                    eqn_mask;
  74         u32                    cons_index;
  75         u16                    msi_x_vector;
  76         u16                    msi_x_entry;
  77         int                    have_irq;
  78         int                    nent;
  79         struct mthca_buf_list *page_list;
  80         struct mthca_mr        mr;
  81 };
  82
  83 struct mthca_av;
  84
  85 enum mthca_ah_type {
  86         MTHCA_AH_ON_HCA,
  87         MTHCA_AH_PCI_POOL,
  88         MTHCA_AH_KMALLOC
  89 };
  90
  91 struct mthca_ah {
  92         struct ib_ah       ibah;
  93         enum mthca_ah_type type;
  94         u32                key;
  95         struct mthca_av   *av;
  96         dma_addr_t         avdma;
  97 };
  98
  99 /*
 100  * Quick description of our CQ/QP locking scheme:
 101  *
 102  * We have one global lock that protects dev->cq/qp_table.  Each
 103  * struct mthca_cq/qp also has its own lock.  An individual qp lock
 104  * may be taken inside of an individual cq lock.  Both cqs attached to
 105  * a qp may be locked, with the send cq locked first.  No other
 106  * nesting should be done.
 107  *
 108  * Each struct mthca_cq/qp also has an atomic_t ref count.  The
 109  * pointer from the cq/qp_table to the struct counts as one reference.
 110  * This reference also is good for access through the consumer API, so
 111  * modifying the CQ/QP etc doesn't need to take another reference.
 112  * Access because of a completion being polled does need a reference.
 113  *
 114  * Finally, each struct mthca_cq/qp has a wait_queue_head_t for the
 115  * destroy function to sleep on.
 116  *
 117  * This means that access from the consumer API requires nothing but
 118  * taking the struct's lock.
 119  *
 120  * Access because of a completion event should go as follows:
 121  * - lock cq/qp_table and look up struct
 122  * - increment ref count in struct
 123  * - drop cq/qp_table lock
 124  * - lock struct, do your thing, and unlock struct
 125  * - decrement ref count; if zero, wake up waiters
 126  *
 127  * To destroy a CQ/QP, we can do the following:
 128  * - lock cq/qp_table, remove pointer, unlock cq/qp_table lock
 129  * - decrement ref count
 130  * - wait_event until ref count is zero
 131  *
 132  * It is the consumer's responsibilty to make sure that no QP
 133  * operations (WQE posting or state modification) are pending when the
 134  * QP is destroyed.  Also, the consumer must make sure that calls to
 135  * qp_modify are serialized.
 136  *
 137  * Possible optimizations (wait for profile data to see if/where we
 138  * have locks bouncing between CPUs):
 139  * - split cq/qp table lock into n separate (cache-aligned) locks,
 140  *   indexed (say) by the page in the table
 141  * - split QP struct lock into three (one for common info, one for the
 142  *   send queue and one for the receive queue)
 143  */
 144
 145 struct mthca_cq {
 146         struct ib_cq           ibcq;
 147         spinlock_t             lock;
 148         atomic_t               refcount;
 149         int                    cqn;
 150         u32                    cons_index;
 151         int                    is_direct;
 152
 153         /* Next fields are Arbel only */
 154         int                    set_ci_db_index;
 155         u32                   *set_ci_db;
 156         int                    arm_db_index;
 157         u32                   *arm_db;
 158         int                    arm_sn;
 159
 160         union {
 161                 struct mthca_buf_list direct;
 162                 struct mthca_buf_list *page_list;
 163         }                      queue;
 164         struct mthca_mr        mr;
 165         wait_queue_head_t      wait;
 166 };
 167
 168 struct mthca_wq {
 169         spinlock_t lock;
 170         int        max;
 171         unsigned   next_ind;
 172         unsigned   last_comp;
 173         unsigned   head;
 174         unsigned   tail;
 175         void      *last;
 176         int        max_gs;
 177         int        wqe_shift;
 178
 179         int        db_index;    /* Arbel only */
 180         u32       *db;
 181 };
 182
 183 struct mthca_qp {
 184         struct ib_qp           ibqp;
 185         atomic_t               refcount;
 186         u32                    qpn;
 187         int                    is_direct;
 188         u8                     transport;
 189         u8                     state;
 190         u8                     atomic_rd_en;
 191         u8                     resp_depth;
 192
 193         struct mthca_mr        mr;
 194
 195         struct mthca_wq        rq;
 196         struct mthca_wq        sq;
 197         enum ib_sig_type       sq_policy;
 198         int                    send_wqe_offset;
 199
 200         u64                   *wrid;
 201         union {
 202                 struct mthca_buf_list direct;
 203                 struct mthca_buf_list *page_list;
 204         }                      queue;
 205
 206         wait_queue_head_t      wait;
 207 };
 208
 209 struct mthca_sqp {
 210         struct mthca_qp qp;
 211         int             port;
 212         int             pkey_index;
 213         u32             qkey;
 214         u32             send_psn;
 215         struct ib_ud_header ud_header;
 216         int             header_buf_size;
 217         void           *header_buf;
 218         dma_addr_t      header_dma;
 219 };
 220
 221 static inline struct mthca_mr *to_mmr(struct ib_mr *ibmr)
 222 {
 223         return container_of(ibmr, struct mthca_mr, ibmr);
 224 }
 225
 226 static inline struct mthca_pd *to_mpd(struct ib_pd *ibpd)
 227 {
 228         return container_of(ibpd, struct mthca_pd, ibpd);
 229 }
 230
 231 static inline struct mthca_ah *to_mah(struct ib_ah *ibah)
 232 {
 233         return container_of(ibah, struct mthca_ah, ibah);
 234 }
 235
 236 static inline struct mthca_cq *to_mcq(struct ib_cq *ibcq)
 237 {
 238         return container_of(ibcq, struct mthca_cq, ibcq);
 239 }
 240
 241 static inline struct mthca_qp *to_mqp(struct ib_qp *ibqp)
 242 {
 243         return container_of(ibqp, struct mthca_qp, ibqp);
 244 }
 245
 246 static inline struct mthca_sqp *to_msqp(struct mthca_qp *qp)
 247 {
 248         return container_of(qp, struct mthca_sqp, qp);
 249 }
 250
 251 #endif /* MTHCA_PROVIDER_H */