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
  37 #if !defined(IB_MAD_H)
  38 #define IB_MAD_H
  39
  40 #include <linux/list.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 /* MAD Status field bit masks */
  81 #define IB_MGMT_MAD_STATUS_SUCCESS                      0x0000
  82 #define IB_MGMT_MAD_STATUS_BUSY                         0x0001
  83 #define IB_MGMT_MAD_STATUS_REDIRECT_REQD                0x0002
  84 #define IB_MGMT_MAD_STATUS_BAD_VERSION                  0x0004
  85 #define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD           0x0008
  86 #define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB    0x000c
  87 #define IB_MGMT_MAD_STATUS_INVALID_ATTRIB_VALUE         0x001c
  88
  89 /* RMPP information */
  90 #define IB_MGMT_RMPP_VERSION                    1
  91
  92 #define IB_MGMT_RMPP_TYPE_DATA                  1
  93 #define IB_MGMT_RMPP_TYPE_ACK                   2
  94 #define IB_MGMT_RMPP_TYPE_STOP                  3
  95 #define IB_MGMT_RMPP_TYPE_ABORT                 4
  96
  97 #define IB_MGMT_RMPP_FLAG_ACTIVE                1
  98 #define IB_MGMT_RMPP_FLAG_FIRST                 (1<<1)
  99 #define IB_MGMT_RMPP_FLAG_LAST                  (1<<2)
 100
 101 #define IB_MGMT_RMPP_NO_RESPTIME                0x1F
 102
 103 #define IB_MGMT_RMPP_STATUS_SUCCESS             0
 104 #define IB_MGMT_RMPP_STATUS_RESX                1
 105 #define IB_MGMT_RMPP_STATUS_ABORT_MIN           118
 106 #define IB_MGMT_RMPP_STATUS_T2L                 118
 107 #define IB_MGMT_RMPP_STATUS_BAD_LEN             119
 108 #define IB_MGMT_RMPP_STATUS_BAD_SEG             120
 109 #define IB_MGMT_RMPP_STATUS_BADT                121
 110 #define IB_MGMT_RMPP_STATUS_W2S                 122
 111 #define IB_MGMT_RMPP_STATUS_S2B                 123
 112 #define IB_MGMT_RMPP_STATUS_BAD_STATUS          124
 113 #define IB_MGMT_RMPP_STATUS_UNV                 125
 114 #define IB_MGMT_RMPP_STATUS_TMR                 126
 115 #define IB_MGMT_RMPP_STATUS_UNSPEC              127
 116 #define IB_MGMT_RMPP_STATUS_ABORT_MAX           127
 117
 118 #define IB_QP0          0
 119 #define IB_QP1          cpu_to_be32(1)
 120 #define IB_QP1_QKEY     0x80010000
 121 #define IB_QP_SET_QKEY  0x80000000
 122
 123 #define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
 124 #define IB_DEFAULT_PKEY_FULL    0xFFFF
 125
 126 enum {
 127         IB_MGMT_MAD_HDR = 24,
 128         IB_MGMT_MAD_DATA = 232,
 129         IB_MGMT_RMPP_HDR = 36,
 130         IB_MGMT_RMPP_DATA = 220,
 131         IB_MGMT_VENDOR_HDR = 40,
 132         IB_MGMT_VENDOR_DATA = 216,
 133         IB_MGMT_SA_HDR = 56,
 134         IB_MGMT_SA_DATA = 200,
 135         IB_MGMT_DEVICE_HDR = 64,
 136         IB_MGMT_DEVICE_DATA = 192,
 137 };
 138
 139 struct ib_mad_hdr {
 140         u8      base_version;
 141         u8      mgmt_class;
 142         u8      class_version;
 143         u8      method;
 144         __be16  status;
 145         __be16  class_specific;
 146         __be64  tid;
 147         __be16  attr_id;
 148         __be16  resv;
 149         __be32  attr_mod;
 150 };
 151
 152 struct ib_rmpp_hdr {
 153         u8      rmpp_version;
 154         u8      rmpp_type;
 155         u8      rmpp_rtime_flags;
 156         u8      rmpp_status;
 157         __be32  seg_num;
 158         __be32  paylen_newwin;
 159 };
 160
 161 typedef u64 __bitwise ib_sa_comp_mask;
 162
 163 #define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << (n)))
 164
 165 /*
 166  * ib_sa_hdr and ib_sa_mad structures must be packed because they have
 167  * 64-bit fields that are only 32-bit aligned. 64-bit architectures will
 168  * lay them out wrong otherwise.  (And unfortunately they are sent on
 169  * the wire so we can't change the layout)
 170  */
 171 struct ib_sa_hdr {
 172         __be64                  sm_key;
 173         __be16                  attr_offset;
 174         __be16                  reserved;
 175         ib_sa_comp_mask         comp_mask;
 176 } __attribute__ ((packed));
 177
 178 struct ib_mad {
 179         struct ib_mad_hdr       mad_hdr;
 180         u8                      data[IB_MGMT_MAD_DATA];
 181 };
 182
 183 struct ib_rmpp_mad {
 184         struct ib_mad_hdr       mad_hdr;
 185         struct ib_rmpp_hdr      rmpp_hdr;
 186         u8                      data[IB_MGMT_RMPP_DATA];
 187 };
 188
 189 struct ib_sa_mad {
 190         struct ib_mad_hdr       mad_hdr;
 191         struct ib_rmpp_hdr      rmpp_hdr;
 192         struct ib_sa_hdr        sa_hdr;
 193         u8                      data[IB_MGMT_SA_DATA];
 194 } __attribute__ ((packed));
 195
 196 struct ib_vendor_mad {
 197         struct ib_mad_hdr       mad_hdr;
 198         struct ib_rmpp_hdr      rmpp_hdr;
 199         u8                      reserved;
 200         u8                      oui[3];
 201         u8                      data[IB_MGMT_VENDOR_DATA];
 202 };
 203
 204 struct ib_class_port_info {
 205         u8                      base_version;
 206         u8                      class_version;
 207         __be16                  capability_mask;
 208         u8                      reserved[3];
 209         u8                      resp_time_value;
 210         u8                      redirect_gid[16];
 211         __be32                  redirect_tcslfl;
 212         __be16                  redirect_lid;
 213         __be16                  redirect_pkey;
 214         __be32                  redirect_qp;
 215         __be32                  redirect_qkey;
 216         u8                      trap_gid[16];
 217         __be32                  trap_tcslfl;
 218         __be16                  trap_lid;
 219         __be16                  trap_pkey;
 220         __be32                  trap_hlqp;
 221         __be32                  trap_qkey;
 222 };
 223
 224 /**
 225  * ib_mad_send_buf - MAD data buffer and work request for sends.
 226  * @next: A pointer used to chain together MADs for posting.
 227  * @mad: References an allocated MAD data buffer for MADs that do not have
 228  *   RMPP active.  For MADs using RMPP, references the common and management
 229  *   class specific headers.
 230  * @mad_agent: MAD agent that allocated the buffer.
 231  * @ah: The address handle to use when sending the MAD.
 232  * @context: User-controlled context fields.
 233  * @hdr_len: Indicates the size of the data header of the MAD.  This length
 234  *   includes the common MAD, RMPP, and class specific headers.
 235  * @data_len: Indicates the total size of user-transferred data.
 236  * @seg_count: The number of RMPP segments allocated for this send.
 237  * @seg_size: Size of each RMPP segment.
 238  * @timeout_ms: Time to wait for a response.
 239  * @retries: Number of times to retry a request for a response.  For MADs
 240  *   using RMPP, this applies per window.  On completion, returns the number
 241  *   of retries needed to complete the transfer.
 242  *
 243  * Users are responsible for initializing the MAD buffer itself, with the
 244  * exception of any RMPP header.  Additional segment buffer space allocated
 245  * beyond data_len is padding.
 246  */
 247 struct ib_mad_send_buf {
 248         struct ib_mad_send_buf  *next;
 249         void                    *mad;
 250         struct ib_mad_agent     *mad_agent;
 251         struct ib_ah            *ah;
 252         void                    *context[2];
 253         int                     hdr_len;
 254         int                     data_len;
 255         int                     seg_count;
 256         int                     seg_size;
 257         int                     timeout_ms;
 258         int                     retries;
 259 };
 260
 261 /**
 262  * ib_response_mad - Returns if the specified MAD has been generated in
 263  *   response to a sent request or trap.
 264  */
 265 int ib_response_mad(struct ib_mad *mad);
 266
 267 /**
 268  * ib_get_rmpp_resptime - Returns the RMPP response time.
 269  * @rmpp_hdr: An RMPP header.
 270  */
 271 static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
 272 {
 273         return rmpp_hdr->rmpp_rtime_flags >> 3;
 274 }
 275
 276 /**
 277  * ib_get_rmpp_flags - Returns the RMPP flags.
 278  * @rmpp_hdr: An RMPP header.
 279  */
 280 static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
 281 {
 282         return rmpp_hdr->rmpp_rtime_flags & 0x7;
 283 }
 284
 285 /**
 286  * ib_set_rmpp_resptime - Sets the response time in an RMPP header.
 287  * @rmpp_hdr: An RMPP header.
 288  * @rtime: The response time to set.
 289  */
 290 static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
 291 {
 292         rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
 293 }
 294
 295 /**
 296  * ib_set_rmpp_flags - Sets the flags in an RMPP header.
 297  * @rmpp_hdr: An RMPP header.
 298  * @flags: The flags to set.
 299  */
 300 static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
 301 {
 302         rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF8) |
 303                                      (flags & 0x7);
 304 }
 305
 306 struct ib_mad_agent;
 307 struct ib_mad_send_wc;
 308 struct ib_mad_recv_wc;
 309
 310 /**
 311  * ib_mad_send_handler - callback handler for a sent MAD.
 312  * @mad_agent: MAD agent that sent the MAD.
 313  * @mad_send_wc: Send work completion information on the sent MAD.
 314  */
 315 typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
 316                                     struct ib_mad_send_wc *mad_send_wc);
 317
 318 /**
 319  * ib_mad_snoop_handler - Callback handler for snooping sent MADs.
 320  * @mad_agent: MAD agent that snooped the MAD.
 321  * @send_wr: Work request information on the sent MAD.
 322  * @mad_send_wc: Work completion information on the sent MAD.  Valid
 323  *   only for snooping that occurs on a send completion.
 324  *
 325  * Clients snooping MADs should not modify data referenced by the @send_wr
 326  * or @mad_send_wc.
 327  */
 328 typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,
 329                                      struct ib_mad_send_buf *send_buf,
 330                                      struct ib_mad_send_wc *mad_send_wc);
 331
 332 /**
 333  * ib_mad_recv_handler - callback handler for a received MAD.
 334  * @mad_agent: MAD agent requesting the received MAD.
 335  * @mad_recv_wc: Received work completion information on the received MAD.
 336  *
 337  * MADs received in response to a send request operation will be handed to
 338  * the user before the send operation completes.  All data buffers given
 339  * to registered agents through this routine are owned by the receiving
 340  * client, except for snooping agents.  Clients snooping MADs should not
 341  * modify the data referenced by @mad_recv_wc.
 342  */
 343 typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
 344                                     struct ib_mad_recv_wc *mad_recv_wc);
 345
 346 /**
 347  * ib_mad_agent - Used to track MAD registration with the access layer.
 348  * @device: Reference to device registration is on.
 349  * @qp: Reference to QP used for sending and receiving MADs.
 350  * @mr: Memory region for system memory usable for DMA.
 351  * @recv_handler: Callback handler for a received MAD.
 352  * @send_handler: Callback handler for a sent MAD.
 353  * @snoop_handler: Callback handler for snooped sent MADs.
 354  * @context: User-specified context associated with this registration.
 355  * @hi_tid: Access layer assigned transaction ID for this client.
 356  *   Unsolicited MADs sent by this client will have the upper 32-bits
 357  *   of their TID set to this value.
 358  * @port_num: Port number on which QP is registered
 359  * @rmpp_version: If set, indicates the RMPP version used by this agent.
 360  */
 361 struct ib_mad_agent {
 362         struct ib_device        *device;
 363         struct ib_qp            *qp;
 364         struct ib_mr            *mr;
 365         ib_mad_recv_handler     recv_handler;
 366         ib_mad_send_handler     send_handler;
 367         ib_mad_snoop_handler    snoop_handler;
 368         void                    *context;
 369         u32                     hi_tid;
 370         u8                      port_num;
 371         u8                      rmpp_version;
 372 };
 373
 374 /**
 375  * ib_mad_send_wc - MAD send completion information.
 376  * @send_buf: Send MAD data buffer associated with the send MAD request.
 377  * @status: Completion status.
 378  * @vendor_err: Optional vendor error information returned with a failed
 379  *   request.
 380  */
 381 struct ib_mad_send_wc {
 382         struct ib_mad_send_buf  *send_buf;
 383         enum ib_wc_status       status;
 384         u32                     vendor_err;
 385 };
 386
 387 /**
 388  * ib_mad_recv_buf - received MAD buffer information.
 389  * @list: Reference to next data buffer for a received RMPP MAD.
 390  * @grh: References a data buffer containing the global route header.
 391  *   The data refereced by this buffer is only valid if the GRH is
 392  *   valid.
 393  * @mad: References the start of the received MAD.
 394  */
 395 struct ib_mad_recv_buf {
 396         struct list_head        list;
 397         struct ib_grh           *grh;
 398         struct ib_mad           *mad;
 399 };
 400
 401 /**
 402  * ib_mad_recv_wc - received MAD information.
 403  * @wc: Completion information for the received data.
 404  * @recv_buf: Specifies the location of the received data buffer(s).
 405  * @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.
 406  * @mad_len: The length of the received MAD, without duplicated headers.
 407  *
 408  * For received response, the wr_id contains a pointer to the ib_mad_send_buf
 409  *   for the corresponding send request.
 410  */
 411 struct ib_mad_recv_wc {
 412         struct ib_wc            *wc;
 413         struct ib_mad_recv_buf  recv_buf;
 414         struct list_head        rmpp_list;
 415         int                     mad_len;
 416 };
 417
 418 /**
 419  * ib_mad_reg_req - MAD registration request
 420  * @mgmt_class: Indicates which management class of MADs should be receive
 421  *   by the caller.  This field is only required if the user wishes to
 422  *   receive unsolicited MADs, otherwise it should be 0.
 423  * @mgmt_class_version: Indicates which version of MADs for the given
 424  *   management class to receive.
 425  * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
 426  *   in the range from 0x30 to 0x4f. Otherwise not used.
 427  * @method_mask: The caller will receive unsolicited MADs for any method
 428  *   where @method_mask = 1.
 429  */
 430 struct ib_mad_reg_req {
 431         u8      mgmt_class;
 432         u8      mgmt_class_version;
 433         u8      oui[3];
 434         DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
 435 };
 436
 437 /**
 438  * ib_register_mad_agent - Register to send/receive MADs.
 439  * @device: The device to register with.
 440  * @port_num: The port on the specified device to use.
 441  * @qp_type: Specifies which QP to access.  Must be either
 442  *   IB_QPT_SMI or IB_QPT_GSI.
 443  * @mad_reg_req: Specifies which unsolicited MADs should be received
 444  *   by the caller.  This parameter may be NULL if the caller only
 445  *   wishes to receive solicited responses.
 446  * @rmpp_version: If set, indicates that the client will send
 447  *   and receive MADs that contain the RMPP header for the given version.
 448  *   If set to 0, indicates that RMPP is not used by this client.
 449  * @send_handler: The completion callback routine invoked after a send
 450  *   request has completed.
 451  * @recv_handler: The completion callback routine invoked for a received
 452  *   MAD.
 453  * @context: User specified context associated with the registration.
 454  */
 455 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 456                                            u8 port_num,
 457                                            enum ib_qp_type qp_type,
 458                                            struct ib_mad_reg_req *mad_reg_req,
 459                                            u8 rmpp_version,
 460                                            ib_mad_send_handler send_handler,
 461                                            ib_mad_recv_handler recv_handler,
 462                                            void *context);
 463
 464 enum ib_mad_snoop_flags {
 465         /*IB_MAD_SNOOP_POSTED_SENDS        = 1,*/
 466         /*IB_MAD_SNOOP_RMPP_SENDS          = (1<<1),*/
 467         IB_MAD_SNOOP_SEND_COMPLETIONS      = (1<<2),
 468         /*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
 469         IB_MAD_SNOOP_RECVS                 = (1<<4)
 470         /*IB_MAD_SNOOP_RMPP_RECVS          = (1<<5),*/
 471         /*IB_MAD_SNOOP_REDIRECTED_QPS      = (1<<6)*/
 472 };
 473
 474 /**
 475  * ib_register_mad_snoop - Register to snoop sent and received MADs.
 476  * @device: The device to register with.
 477  * @port_num: The port on the specified device to use.
 478  * @qp_type: Specifies which QP traffic to snoop.  Must be either
 479  *   IB_QPT_SMI or IB_QPT_GSI.
 480  * @mad_snoop_flags: Specifies information where snooping occurs.
 481  * @send_handler: The callback routine invoked for a snooped send.
 482  * @recv_handler: The callback routine invoked for a snooped receive.
 483  * @context: User specified context associated with the registration.
 484  */
 485 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 486                                            u8 port_num,
 487                                            enum ib_qp_type qp_type,
 488                                            int mad_snoop_flags,
 489                                            ib_mad_snoop_handler snoop_handler,
 490                                            ib_mad_recv_handler recv_handler,
 491                                            void *context);
 492
 493 /**
 494  * ib_unregister_mad_agent - Unregisters a client from using MAD services.
 495  * @mad_agent: Corresponding MAD registration request to deregister.
 496  *
 497  * After invoking this routine, MAD services are no longer usable by the
 498  * client on the associated QP.
 499  */
 500 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);
 501
 502 /**
 503  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 504  *   with the registered client.
 505  * @send_buf: Specifies the information needed to send the MAD(s).
 506  * @bad_send_buf: Specifies the MAD on which an error was encountered.  This
 507  *   parameter is optional if only a single MAD is posted.
 508  *
 509  * Sent MADs are not guaranteed to complete in the order that they were posted.
 510  *
 511  * If the MAD requires RMPP, the data buffer should contain a single copy
 512  * of the common MAD, RMPP, and class specific headers, followed by the class
 513  * defined data.  If the class defined data would not divide evenly into
 514  * RMPP segments, then space must be allocated at the end of the referenced
 515  * buffer for any required padding.  To indicate the amount of class defined
 516  * data being transferred, the paylen_newwin field in the RMPP header should
 517  * be set to the size of the class specific header plus the amount of class
 518  * defined data being transferred.  The paylen_newwin field should be
 519  * specified in network-byte order.
 520  */
 521 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
 522                      struct ib_mad_send_buf **bad_send_buf);
 523
 524
 525 /**
 526  * ib_free_recv_mad - Returns data buffers used to receive a MAD.
 527  * @mad_recv_wc: Work completion information for a received MAD.
 528  *
 529  * Clients receiving MADs through their ib_mad_recv_handler must call this
 530  * routine to return the work completion buffers to the access layer.
 531  */
 532 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);
 533
 534 /**
 535  * ib_cancel_mad - Cancels an outstanding send MAD operation.
 536  * @mad_agent: Specifies the registration associated with sent MAD.
 537  * @send_buf: Indicates the MAD to cancel.
 538  *
 539  * MADs will be returned to the user through the corresponding
 540  * ib_mad_send_handler.
 541  */
 542 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
 543                    struct ib_mad_send_buf *send_buf);
 544
 545 /**
 546  * ib_modify_mad - Modifies an outstanding send MAD operation.
 547  * @mad_agent: Specifies the registration associated with sent MAD.
 548  * @send_buf: Indicates the MAD to modify.
 549  * @timeout_ms: New timeout value for sent MAD.
 550  *
 551  * This call will reset the timeout value for a sent MAD to the specified
 552  * value.
 553  */
 554 int ib_modify_mad(struct ib_mad_agent *mad_agent,
 555                   struct ib_mad_send_buf *send_buf, u32 timeout_ms);
 556
 557 /**
 558  * ib_redirect_mad_qp - Registers a QP for MAD services.
 559  * @qp: Reference to a QP that requires MAD services.
 560  * @rmpp_version: If set, indicates that the client will send
 561  *   and receive MADs that contain the RMPP header for the given version.
 562  *   If set to 0, indicates that RMPP is not used by this client.
 563  * @send_handler: The completion callback routine invoked after a send
 564  *   request has completed.
 565  * @recv_handler: The completion callback routine invoked for a received
 566  *   MAD.
 567  * @context: User specified context associated with the registration.
 568  *
 569  * Use of this call allows clients to use MAD services, such as RMPP,
 570  * on user-owned QPs.  After calling this routine, users may send
 571  * MADs on the specified QP by calling ib_mad_post_send.
 572  */
 573 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
 574                                         u8 rmpp_version,
 575                                         ib_mad_send_handler send_handler,
 576                                         ib_mad_recv_handler recv_handler,
 577                                         void *context);
 578
 579 /**
 580  * ib_process_mad_wc - Processes a work completion associated with a
 581  *   MAD sent or received on a redirected QP.
 582  * @mad_agent: Specifies the registered MAD service using the redirected QP.
 583  * @wc: References a work completion associated with a sent or received
 584  *   MAD segment.
 585  *
 586  * This routine is used to complete or continue processing on a MAD request.
 587  * If the work completion is associated with a send operation, calling
 588  * this routine is required to continue an RMPP transfer or to wait for a
 589  * corresponding response, if it is a request.  If the work completion is
 590  * associated with a receive operation, calling this routine is required to
 591  * process an inbound or outbound RMPP transfer, or to match a response MAD
 592  * with its corresponding request.
 593  */
 594 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
 595                       struct ib_wc *wc);
 596
 597 /**
 598  * ib_create_send_mad - Allocate and initialize a data buffer and work request
 599  *   for sending a MAD.
 600  * @mad_agent: Specifies the registered MAD service to associate with the MAD.
 601  * @remote_qpn: Specifies the QPN of the receiving node.
 602  * @pkey_index: Specifies which PKey the MAD will be sent using.  This field
 603  *   is valid only if the remote_qpn is QP 1.
 604  * @rmpp_active: Indicates if the send will enable RMPP.
 605  * @hdr_len: Indicates the size of the data header of the MAD.  This length
 606  *   should include the common MAD header, RMPP header, plus any class
 607  *   specific header.
 608  * @data_len: Indicates the size of any user-transferred data.  The call will
 609  *   automatically adjust the allocated buffer size to account for any
 610  *   additional padding that may be necessary.
 611  * @gfp_mask: GFP mask used for the memory allocation.
 612  *
 613  * This routine allocates a MAD for sending.  The returned MAD send buffer
 614  * will reference a data buffer usable for sending a MAD, along
 615  * with an initialized work request structure.  Users may modify the returned
 616  * MAD data buffer before posting the send.
 617  *
 618  * The returned MAD header, class specific headers, and any padding will be
 619  * cleared.  Users are responsible for initializing the common MAD header,
 620  * any class specific header, and MAD data area.
 621  * If @rmpp_active is set, the RMPP header will be initialized for sending.
 622  */
 623 struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
 624                                            u32 remote_qpn, u16 pkey_index,
 625                                            int rmpp_active,
 626                                            int hdr_len, int data_len,
 627                                            gfp_t gfp_mask);
 628
 629 /**
 630  * ib_is_mad_class_rmpp - returns whether given management class
 631  * supports RMPP.
 632  * @mgmt_class: management class
 633  *
 634  * This routine returns whether the management class supports RMPP.
 635  */
 636 int ib_is_mad_class_rmpp(u8 mgmt_class);
 637
 638 /**
 639  * ib_get_mad_data_offset - returns the data offset for a given
 640  * management class.
 641  * @mgmt_class: management class
 642  *
 643  * This routine returns the data offset in the MAD for the management
 644  * class requested.
 645  */
 646 int ib_get_mad_data_offset(u8 mgmt_class);
 647
 648 /**
 649  * ib_get_rmpp_segment - returns the data buffer for a given RMPP segment.
 650  * @send_buf: Previously allocated send data buffer.
 651  * @seg_num: number of segment to return
 652  *
 653  * This routine returns a pointer to the data buffer of an RMPP MAD.
 654  * Users must provide synchronization to @send_buf around this call.
 655  */
 656 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num);
 657
 658 /**
 659  * ib_free_send_mad - Returns data buffers used to send a MAD.
 660  * @send_buf: Previously allocated send data buffer.
 661  */
 662 void ib_free_send_mad(struct ib_mad_send_buf *send_buf);
 663
 664 #endif /* IB_MAD_H */