include/rdma/ib_mad.h

   1 /*
   2  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
   3  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
   4  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
   5  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   6  * Copyright (c) 2004-2006 Voltaire Corporation.  All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  *
  36  * $Id: ib_mad.h 5596 2006-03-03 01:00:07Z sean.hefty $
  37  */
  38
  39 #if !defined( IB_MAD_H )
  40 #define IB_MAD_H
  41
  42 #include <rdma/ib_verbs.h>
  43
  44 /* Management base version */
  45 #define IB_MGMT_BASE_VERSION                    1
  46
  47 /* Management classes */
  48 #define IB_MGMT_CLASS_SUBN_LID_ROUTED           0x01
  49 #define IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE       0x81
  50 #define IB_MGMT_CLASS_SUBN_ADM                  0x03
  51 #define IB_MGMT_CLASS_PERF_MGMT                 0x04
  52 #define IB_MGMT_CLASS_BM                        0x05
  53 #define IB_MGMT_CLASS_DEVICE_MGMT               0x06
  54 #define IB_MGMT_CLASS_CM                        0x07
  55 #define IB_MGMT_CLASS_SNMP                      0x08
  56 #define IB_MGMT_CLASS_DEVICE_ADM                0x10
  57 #define IB_MGMT_CLASS_BOOT_MGMT                 0x11
  58 #define IB_MGMT_CLASS_BIS                       0x12
  59 #define IB_MGMT_CLASS_CONG_MGMT                 0x21
  60 #define IB_MGMT_CLASS_VENDOR_RANGE2_START       0x30
  61 #define IB_MGMT_CLASS_VENDOR_RANGE2_END         0x4F
  62
  63 #define IB_OPENIB_OUI                           (0x001405)
  64
  65 /* Management methods */
  66 #define IB_MGMT_METHOD_GET                      0x01
  67 #define IB_MGMT_METHOD_SET                      0x02
  68 #define IB_MGMT_METHOD_GET_RESP                 0x81
  69 #define IB_MGMT_METHOD_SEND                     0x03
  70 #define IB_MGMT_METHOD_TRAP                     0x05
  71 #define IB_MGMT_METHOD_REPORT                   0x06
  72 #define IB_MGMT_METHOD_REPORT_RESP              0x86
  73 #define IB_MGMT_METHOD_TRAP_REPRESS             0x07
  74
  75 #define IB_MGMT_METHOD_RESP                     0x80
  76 #define IB_BM_ATTR_MOD_RESP                     cpu_to_be32(1)
  77
  78 #define IB_MGMT_MAX_METHODS                     128
  79
  80 /* RMPP information */
  81 #define IB_MGMT_RMPP_VERSION                    1
  82
  83 #define IB_MGMT_RMPP_TYPE_DATA                  1
  84 #define IB_MGMT_RMPP_TYPE_ACK                   2
  85 #define IB_MGMT_RMPP_TYPE_STOP                  3
  86 #define IB_MGMT_RMPP_TYPE_ABORT                 4
  87
  88 #define IB_MGMT_RMPP_FLAG_ACTIVE                1
  89 #define IB_MGMT_RMPP_FLAG_FIRST                 (1<<1)
  90 #define IB_MGMT_RMPP_FLAG_LAST                  (1<<2)
  91
  92 #define IB_MGMT_RMPP_NO_RESPTIME                0x1F
  93
  94 #define IB_MGMT_RMPP_STATUS_SUCCESS             0
  95 #define IB_MGMT_RMPP_STATUS_RESX                1
  96 #define IB_MGMT_RMPP_STATUS_ABORT_MIN           118
  97 #define IB_MGMT_RMPP_STATUS_T2L                 118
  98 #define IB_MGMT_RMPP_STATUS_BAD_LEN             119
  99 #define IB_MGMT_RMPP_STATUS_BAD_SEG             120
 100 #define IB_MGMT_RMPP_STATUS_BADT                121
 101 #define IB_MGMT_RMPP_STATUS_W2S                 122
 102 #define IB_MGMT_RMPP_STATUS_S2B                 123
 103 #define IB_MGMT_RMPP_STATUS_BAD_STATUS          124
 104 #define IB_MGMT_RMPP_STATUS_UNV                 125
 105 #define IB_MGMT_RMPP_STATUS_TMR                 126
 106 #define IB_MGMT_RMPP_STATUS_UNSPEC              127
 107 #define IB_MGMT_RMPP_STATUS_ABORT_MAX           127
 108
 109 #define IB_QP0          0
 110 #define IB_QP1          __constant_htonl(1)
 111 #define IB_QP1_QKEY     0x80010000
 112 #define IB_QP_SET_QKEY  0x80000000
 113
 114 #define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
 115 #define IB_DEFAULT_PKEY_FULL    0xFFFF
 116
 117 enum {
 118         IB_MGMT_MAD_HDR = 24,
 119         IB_MGMT_MAD_DATA = 232,
 120         IB_MGMT_RMPP_HDR = 36,
 121         IB_MGMT_RMPP_DATA = 220,
 122         IB_MGMT_VENDOR_HDR = 40,
 123         IB_MGMT_VENDOR_DATA = 216,
 124         IB_MGMT_SA_HDR = 56,
 125         IB_MGMT_SA_DATA = 200,
 126         IB_MGMT_DEVICE_HDR = 64,
 127         IB_MGMT_DEVICE_DATA = 192,
 128 };
 129
 130 struct ib_mad_hdr {
 131         u8      base_version;
 132         u8      mgmt_class;
 133         u8      class_version;
 134         u8      method;
 135         __be16  status;
 136         __be16  class_specific;
 137         __be64  tid;
 138         __be16  attr_id;
 139         __be16  resv;
 140         __be32  attr_mod;
 141 };
 142
 143 struct ib_rmpp_hdr {
 144         u8      rmpp_version;
 145         u8      rmpp_type;
 146         u8      rmpp_rtime_flags;
 147         u8      rmpp_status;
 148         __be32  seg_num;
 149         __be32  paylen_newwin;
 150 };
 151
 152 typedef u64 __bitwise ib_sa_comp_mask;
 153
 154 #define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << n))
 155
 156 /*
 157  * ib_sa_hdr and ib_sa_mad structures must be packed because they have
 158  * 64-bit fields that are only 32-bit aligned. 64-bit architectures will
 159  * lay them out wrong otherwise.  (And unfortunately they are sent on
 160  * the wire so we can't change the layout)
 161  */
 162 struct ib_sa_hdr {
 163         __be64                  sm_key;
 164         __be16                  attr_offset;
 165         __be16                  reserved;
 166         ib_sa_comp_mask         comp_mask;
 167 } __attribute__ ((packed));
 168
 169 struct ib_mad {
 170         struct ib_mad_hdr       mad_hdr;
 171         u8                      data[IB_MGMT_MAD_DATA];
 172 };
 173
 174 struct ib_rmpp_mad {
 175         struct ib_mad_hdr       mad_hdr;
 176         struct ib_rmpp_hdr      rmpp_hdr;
 177         u8                      data[IB_MGMT_RMPP_DATA];
 178 };
 179
 180 struct ib_sa_mad {
 181         struct ib_mad_hdr       mad_hdr;
 182         struct ib_rmpp_hdr      rmpp_hdr;
 183         struct ib_sa_hdr        sa_hdr;
 184         u8                      data[IB_MGMT_SA_DATA];
 185 } __attribute__ ((packed));
 186
 187 struct ib_vendor_mad {
 188         struct ib_mad_hdr       mad_hdr;
 189         struct ib_rmpp_hdr      rmpp_hdr;
 190         u8                      reserved;
 191         u8                      oui[3];
 192         u8                      data[IB_MGMT_VENDOR_DATA];
 193 };
 194
 195 struct ib_class_port_info
 196 {
 197         u8                      base_version;
 198         u8                      class_version;
 199         __be16                  capability_mask;
 200         u8                      reserved[3];
 201         u8                      resp_time_value;
 202         u8                      redirect_gid[16];
 203         __be32                  redirect_tcslfl;
 204         __be16                  redirect_lid;
 205         __be16                  redirect_pkey;
 206         __be32                  redirect_qp;
 207         __be32                  redirect_qkey;
 208         u8                      trap_gid[16];
 209         __be32                  trap_tcslfl;
 210         __be16                  trap_lid;
 211         __be16                  trap_pkey;
 212         __be32                  trap_hlqp;
 213         __be32                  trap_qkey;
 214 };
 215
 216 /**
 217  * ib_mad_send_buf - MAD data buffer and work request for sends.
 218  * @next: A pointer used to chain together MADs for posting.
 219  * @mad: References an allocated MAD data buffer for MADs that do not have
 220  *   RMPP active.  For MADs using RMPP, references the common and management
 221  *   class specific headers.
 222  * @mad_agent: MAD agent that allocated the buffer.
 223  * @ah: The address handle to use when sending the MAD.
 224  * @context: User-controlled context fields.
 225  * @hdr_len: Indicates the size of the data header of the MAD.  This length
 226  *   includes the common MAD, RMPP, and class specific headers.
 227  * @data_len: Indicates the total size of user-transferred data.
 228  * @seg_count: The number of RMPP segments allocated for this send.
 229  * @seg_size: Size of each RMPP segment.
 230  * @timeout_ms: Time to wait for a response.
 231  * @retries: Number of times to retry a request for a response.
 232  *
 233  * Users are responsible for initializing the MAD buffer itself, with the
 234  * exception of any RMPP header.  Additional segment buffer space allocated
 235  * beyond data_len is padding.
 236  */
 237 struct ib_mad_send_buf {
 238         struct ib_mad_send_buf  *next;
 239         void                    *mad;
 240         struct ib_mad_agent     *mad_agent;
 241         struct ib_ah            *ah;
 242         void                    *context[2];
 243         int                     hdr_len;
 244         int                     data_len;
 245         int                     seg_count;
 246         int                     seg_size;
 247         int                     timeout_ms;
 248         int                     retries;
 249 };
 250
 251 /**
 252  * ib_response_mad - Returns if the specified MAD has been generated in
 253  *   response to a sent request or trap.
 254  */
 255 int ib_response_mad(struct ib_mad *mad);
 256
 257 /**
 258  * ib_get_rmpp_resptime - Returns the RMPP response time.
 259  * @rmpp_hdr: An RMPP header.
 260  */
 261 static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
 262 {
 263         return rmpp_hdr->rmpp_rtime_flags >> 3;
 264 }
 265
 266 /**
 267  * ib_get_rmpp_flags - Returns the RMPP flags.
 268  * @rmpp_hdr: An RMPP header.
 269  */
 270 static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
 271 {
 272         return rmpp_hdr->rmpp_rtime_flags & 0x7;
 273 }
 274
 275 /**
 276  * ib_set_rmpp_resptime - Sets the response time in an RMPP header.
 277  * @rmpp_hdr: An RMPP header.
 278  * @rtime: The response time to set.
 279  */
 280 static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
 281 {
 282         rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
 283 }
 284
 285 /**
 286  * ib_set_rmpp_flags - Sets the flags in an RMPP header.
 287  * @rmpp_hdr: An RMPP header.
 288  * @flags: The flags to set.
 289  */
 290 static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
 291 {
 292         rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF1) |
 293                                      (flags & 0x7);
 294 }
 295
 296 struct ib_mad_agent;
 297 struct ib_mad_send_wc;
 298 struct ib_mad_recv_wc;
 299
 300 /**
 301  * ib_mad_send_handler - callback handler for a sent MAD.
 302  * @mad_agent: MAD agent that sent the MAD.
 303  * @mad_send_wc: Send work completion information on the sent MAD.
 304  */
 305 typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
 306                                     struct ib_mad_send_wc *mad_send_wc);
 307
 308 /**
 309  * ib_mad_snoop_handler - Callback handler for snooping sent MADs.
 310  * @mad_agent: MAD agent that snooped the MAD.
 311  * @send_wr: Work request information on the sent MAD.
 312  * @mad_send_wc: Work completion information on the sent MAD.  Valid
 313  *   only for snooping that occurs on a send completion.
 314  *
 315  * Clients snooping MADs should not modify data referenced by the @send_wr
 316  * or @mad_send_wc.
 317  */
 318 typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,
 319                                      struct ib_mad_send_buf *send_buf,
 320                                      struct ib_mad_send_wc *mad_send_wc);
 321
 322 /**
 323  * ib_mad_recv_handler - callback handler for a received MAD.
 324  * @mad_agent: MAD agent requesting the received MAD.
 325  * @mad_recv_wc: Received work completion information on the received MAD.
 326  *
 327  * MADs received in response to a send request operation will be handed to
 328  * the user before the send operation completes.  All data buffers given
 329  * to registered agents through this routine are owned by the receiving
 330  * client, except for snooping agents.  Clients snooping MADs should not
 331  * modify the data referenced by @mad_recv_wc.
 332  */
 333 typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
 334                                     struct ib_mad_recv_wc *mad_recv_wc);
 335
 336 /**
 337  * ib_mad_agent - Used to track MAD registration with the access layer.
 338  * @device: Reference to device registration is on.
 339  * @qp: Reference to QP used for sending and receiving MADs.
 340  * @mr: Memory region for system memory usable for DMA.
 341  * @recv_handler: Callback handler for a received MAD.
 342  * @send_handler: Callback handler for a sent MAD.
 343  * @snoop_handler: Callback handler for snooped sent MADs.
 344  * @context: User-specified context associated with this registration.
 345  * @hi_tid: Access layer assigned transaction ID for this client.
 346  *   Unsolicited MADs sent by this client will have the upper 32-bits
 347  *   of their TID set to this value.
 348  * @port_num: Port number on which QP is registered
 349  * @rmpp_version: If set, indicates the RMPP version used by this agent.
 350  */
 351 struct ib_mad_agent {
 352         struct ib_device        *device;
 353         struct ib_qp            *qp;
 354         struct ib_mr            *mr;
 355         ib_mad_recv_handler     recv_handler;
 356         ib_mad_send_handler     send_handler;
 357         ib_mad_snoop_handler    snoop_handler;
 358         void                    *context;
 359         u32                     hi_tid;
 360         u8                      port_num;
 361         u8                      rmpp_version;
 362 };
 363
 364 /**
 365  * ib_mad_send_wc - MAD send completion information.
 366  * @send_buf: Send MAD data buffer associated with the send MAD request.
 367  * @status: Completion status.
 368  * @vendor_err: Optional vendor error information returned with a failed
 369  *   request.
 370  */
 371 struct ib_mad_send_wc {
 372         struct ib_mad_send_buf  *send_buf;
 373         enum ib_wc_status       status;
 374         u32                     vendor_err;
 375 };
 376
 377 /**
 378  * ib_mad_recv_buf - received MAD buffer information.
 379  * @list: Reference to next data buffer for a received RMPP MAD.
 380  * @grh: References a data buffer containing the global route header.
 381  *   The data refereced by this buffer is only valid if the GRH is
 382  *   valid.
 383  * @mad: References the start of the received MAD.
 384  */
 385 struct ib_mad_recv_buf {
 386         struct list_head        list;
 387         struct ib_grh           *grh;
 388         struct ib_mad           *mad;
 389 };
 390
 391 /**
 392  * ib_mad_recv_wc - received MAD information.
 393  * @wc: Completion information for the received data.
 394  * @recv_buf: Specifies the location of the received data buffer(s).
 395  * @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.
 396  * @mad_len: The length of the received MAD, without duplicated headers.
 397  *
 398  * For received response, the wr_id contains a pointer to the ib_mad_send_buf
 399  *   for the corresponding send request.
 400  */
 401 struct ib_mad_recv_wc {
 402         struct ib_wc            *wc;
 403         struct ib_mad_recv_buf  recv_buf;
 404         struct list_head        rmpp_list;
 405         int                     mad_len;
 406 };
 407
 408 /**
 409  * ib_mad_reg_req - MAD registration request
 410  * @mgmt_class: Indicates which management class of MADs should be receive
 411  *   by the caller.  This field is only required if the user wishes to
 412  *   receive unsolicited MADs, otherwise it should be 0.
 413  * @mgmt_class_version: Indicates which version of MADs for the given
 414  *   management class to receive.
 415  * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
 416  *   in the range from 0x30 to 0x4f. Otherwise not used.
 417  * @method_mask: The caller will receive unsolicited MADs for any method
 418  *   where @method_mask = 1.
 419  */
 420 struct ib_mad_reg_req {
 421         u8      mgmt_class;
 422         u8      mgmt_class_version;
 423         u8      oui[3];
 424         DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
 425 };
 426
 427 /**
 428  * ib_register_mad_agent - Register to send/receive MADs.
 429  * @device: The device to register with.
 430  * @port_num: The port on the specified device to use.
 431  * @qp_type: Specifies which QP to access.  Must be either
 432  *   IB_QPT_SMI or IB_QPT_GSI.
 433  * @mad_reg_req: Specifies which unsolicited MADs should be received
 434  *   by the caller.  This parameter may be NULL if the caller only
 435  *   wishes to receive solicited responses.
 436  * @rmpp_version: If set, indicates that the client will send
 437  *   and receive MADs that contain the RMPP header for the given version.
 438  *   If set to 0, indicates that RMPP is not used by this client.
 439  * @send_handler: The completion callback routine invoked after a send
 440  *   request has completed.
 441  * @recv_handler: The completion callback routine invoked for a received
 442  *   MAD.
 443  * @context: User specified context associated with the registration.
 444  */
 445 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 446                                            u8 port_num,
 447                                            enum ib_qp_type qp_type,
 448                                            struct ib_mad_reg_req *mad_reg_req,
 449                                            u8 rmpp_version,
 450                                            ib_mad_send_handler send_handler,
 451                                            ib_mad_recv_handler recv_handler,
 452                                            void *context);
 453
 454 enum ib_mad_snoop_flags {
 455         /*IB_MAD_SNOOP_POSTED_SENDS        = 1,*/
 456         /*IB_MAD_SNOOP_RMPP_SENDS          = (1<<1),*/
 457         IB_MAD_SNOOP_SEND_COMPLETIONS      = (1<<2),
 458         /*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
 459         IB_MAD_SNOOP_RECVS                 = (1<<4)
 460         /*IB_MAD_SNOOP_RMPP_RECVS          = (1<<5),*/
 461         /*IB_MAD_SNOOP_REDIRECTED_QPS      = (1<<6)*/
 462 };
 463
 464 /**
 465  * ib_register_mad_snoop - Register to snoop sent and received MADs.
 466  * @device: The device to register with.
 467  * @port_num: The port on the specified device to use.
 468  * @qp_type: Specifies which QP traffic to snoop.  Must be either
 469  *   IB_QPT_SMI or IB_QPT_GSI.
 470  * @mad_snoop_flags: Specifies information where snooping occurs.
 471  * @send_handler: The callback routine invoked for a snooped send.
 472  * @recv_handler: The callback routine invoked for a snooped receive.
 473  * @context: User specified context associated with the registration.
 474  */
 475 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 476                                            u8 port_num,
 477                                            enum ib_qp_type qp_type,
 478                                            int mad_snoop_flags,
 479                                            ib_mad_snoop_handler snoop_handler,
 480                                            ib_mad_recv_handler recv_handler,
 481                                            void *context);
 482
 483 /**
 484  * ib_unregister_mad_agent - Unregisters a client from using MAD services.
 485  * @mad_agent: Corresponding MAD registration request to deregister.
 486  *
 487  * After invoking this routine, MAD services are no longer usable by the
 488  * client on the associated QP.
 489  */
 490 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);
 491
 492 /**
 493  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 494  *   with the registered client.
 495  * @send_buf: Specifies the information needed to send the MAD(s).
 496  * @bad_send_buf: Specifies the MAD on which an error was encountered.  This
 497  *   parameter is optional if only a single MAD is posted.
 498  *
 499  * Sent MADs are not guaranteed to complete in the order that they were posted.
 500  *
 501  * If the MAD requires RMPP, the data buffer should contain a single copy
 502  * of the common MAD, RMPP, and class specific headers, followed by the class
 503  * defined data.  If the class defined data would not divide evenly into
 504  * RMPP segments, then space must be allocated at the end of the referenced
 505  * buffer for any required padding.  To indicate the amount of class defined
 506  * data being transferred, the paylen_newwin field in the RMPP header should
 507  * be set to the size of the class specific header plus the amount of class
 508  * defined data being transferred.  The paylen_newwin field should be
 509  * specified in network-byte order.
 510  */
 511 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
 512                      struct ib_mad_send_buf **bad_send_buf);
 513
 514
 515 /**
 516  * ib_free_recv_mad - Returns data buffers used to receive a MAD.
 517  * @mad_recv_wc: Work completion information for a received MAD.
 518  *
 519  * Clients receiving MADs through their ib_mad_recv_handler must call this
 520  * routine to return the work completion buffers to the access layer.
 521  */
 522 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);
 523
 524 /**
 525  * ib_cancel_mad - Cancels an outstanding send MAD operation.
 526  * @mad_agent: Specifies the registration associated with sent MAD.
 527  * @send_buf: Indicates the MAD to cancel.
 528  *
 529  * MADs will be returned to the user through the corresponding
 530  * ib_mad_send_handler.
 531  */
 532 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
 533                    struct ib_mad_send_buf *send_buf);
 534
 535 /**
 536  * ib_modify_mad - Modifies an outstanding send MAD operation.
 537  * @mad_agent: Specifies the registration associated with sent MAD.
 538  * @send_buf: Indicates the MAD to modify.
 539  * @timeout_ms: New timeout value for sent MAD.
 540  *
 541  * This call will reset the timeout value for a sent MAD to the specified
 542  * value.
 543  */
 544 int ib_modify_mad(struct ib_mad_agent *mad_agent,
 545                   struct ib_mad_send_buf *send_buf, u32 timeout_ms);
 546
 547 /**
 548  * ib_redirect_mad_qp - Registers a QP for MAD services.
 549  * @qp: Reference to a QP that requires MAD services.
 550  * @rmpp_version: If set, indicates that the client will send
 551  *   and receive MADs that contain the RMPP header for the given version.
 552  *   If set to 0, indicates that RMPP is not used by this client.
 553  * @send_handler: The completion callback routine invoked after a send
 554  *   request has completed.
 555  * @recv_handler: The completion callback routine invoked for a received
 556  *   MAD.
 557  * @context: User specified context associated with the registration.
 558  *
 559  * Use of this call allows clients to use MAD services, such as RMPP,
 560  * on user-owned QPs.  After calling this routine, users may send
 561  * MADs on the specified QP by calling ib_mad_post_send.
 562  */
 563 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
 564                                         u8 rmpp_version,
 565                                         ib_mad_send_handler send_handler,
 566                                         ib_mad_recv_handler recv_handler,
 567                                         void *context);
 568
 569 /**
 570  * ib_process_mad_wc - Processes a work completion associated with a
 571  *   MAD sent or received on a redirected QP.
 572  * @mad_agent: Specifies the registered MAD service using the redirected QP.
 573  * @wc: References a work completion associated with a sent or received
 574  *   MAD segment.
 575  *
 576  * This routine is used to complete or continue processing on a MAD request.
 577  * If the work completion is associated with a send operation, calling
 578  * this routine is required to continue an RMPP transfer or to wait for a
 579  * corresponding response, if it is a request.  If the work completion is
 580  * associated with a receive operation, calling this routine is required to
 581  * process an inbound or outbound RMPP transfer, or to match a response MAD
 582  * with its corresponding request.
 583  */
 584 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
 585                       struct ib_wc *wc);
 586
 587 /**
 588  * ib_create_send_mad - Allocate and initialize a data buffer and work request
 589  *   for sending a MAD.
 590  * @mad_agent: Specifies the registered MAD service to associate with the MAD.
 591  * @remote_qpn: Specifies the QPN of the receiving node.
 592  * @pkey_index: Specifies which PKey the MAD will be sent using.  This field
 593  *   is valid only if the remote_qpn is QP 1.
 594  * @rmpp_active: Indicates if the send will enable RMPP.
 595  * @hdr_len: Indicates the size of the data header of the MAD.  This length
 596  *   should include the common MAD header, RMPP header, plus any class
 597  *   specific header.
 598  * @data_len: Indicates the size of any user-transferred data.  The call will
 599  *   automatically adjust the allocated buffer size to account for any
 600  *   additional padding that may be necessary.
 601  * @gfp_mask: GFP mask used for the memory allocation.
 602  *
 603  * This routine allocates a MAD for sending.  The returned MAD send buffer
 604  * will reference a data buffer usable for sending a MAD, along
 605  * with an initialized work request structure.  Users may modify the returned
 606  * MAD data buffer before posting the send.
 607  *
 608  * The returned MAD header, class specific headers, and any padding will be
 609  * cleared.  Users are responsible for initializing the common MAD header,
 610  * any class specific header, and MAD data area.
 611  * If @rmpp_active is set, the RMPP header will be initialized for sending.
 612  */
 613 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 614                                             u32 remote_qpn, u16 pkey_index,
 615                                             int rmpp_active,
 616                                             int hdr_len, int data_len,
 617                                             gfp_t gfp_mask);
 618
 619 /**
 620  * ib_is_mad_class_rmpp - returns whether given management class
 621  * supports RMPP.
 622  * @mgmt_class: management class
 623  *
 624  * This routine returns whether the management class supports RMPP.
 625  */
 626 int ib_is_mad_class_rmpp(u8 mgmt_class);
 627
 628 /**
 629  * ib_get_mad_data_offset - returns the data offset for a given
 630  * management class.
 631  * @mgmt_class: management class
 632  *
 633  * This routine returns the data offset in the MAD for the management
 634  * class requested.
 635  */
 636 int ib_get_mad_data_offset(u8 mgmt_class);
 637
 638 /**
 639  * ib_get_rmpp_segment - returns the data buffer for a given RMPP segment.
 640  * @send_buf: Previously allocated send data buffer.
 641  * @seg_num: number of segment to return
 642  *
 643  * This routine returns a pointer to the data buffer of an RMPP MAD.
 644  * Users must provide synchronization to @send_buf around this call.
 645  */
 646 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num);
 647
 648 /**
 649  * ib_free_send_mad - Returns data buffers used to send a MAD.
 650  * @send_buf: Previously allocated send data buffer.
 651  */
 652 void ib_free_send_mad(struct ib_mad_send_buf *send_buf);
 653
 654 #endif /* IB_MAD_H */