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 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 2775 2005-07-02 13:42:12Z halr $
  37  */
  38
  39 #if !defined( IB_MAD_H )
  40 #define IB_MAD_H
  41
  42 #include <linux/pci.h>
  43
  44 #include <rdma/ib_verbs.h>
  45
  46 /* Management base version */
  47 #define IB_MGMT_BASE_VERSION                    1
  48
  49 /* Management classes */
  50 #define IB_MGMT_CLASS_SUBN_LID_ROUTED           0x01
  51 #define IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE       0x81
  52 #define IB_MGMT_CLASS_SUBN_ADM                  0x03
  53 #define IB_MGMT_CLASS_PERF_MGMT                 0x04
  54 #define IB_MGMT_CLASS_BM                        0x05
  55 #define IB_MGMT_CLASS_DEVICE_MGMT               0x06
  56 #define IB_MGMT_CLASS_CM                        0x07
  57 #define IB_MGMT_CLASS_SNMP                      0x08
  58 #define IB_MGMT_CLASS_VENDOR_RANGE2_START       0x30
  59 #define IB_MGMT_CLASS_VENDOR_RANGE2_END         0x4F
  60
  61 #define IB_OPENIB_OUI                           (0x001405)
  62
  63 /* Management methods */
  64 #define IB_MGMT_METHOD_GET                      0x01
  65 #define IB_MGMT_METHOD_SET                      0x02
  66 #define IB_MGMT_METHOD_GET_RESP                 0x81
  67 #define IB_MGMT_METHOD_SEND                     0x03
  68 #define IB_MGMT_METHOD_TRAP                     0x05
  69 #define IB_MGMT_METHOD_REPORT                   0x06
  70 #define IB_MGMT_METHOD_REPORT_RESP              0x86
  71 #define IB_MGMT_METHOD_TRAP_REPRESS             0x07
  72
  73 #define IB_MGMT_METHOD_RESP                     0x80
  74
  75 #define IB_MGMT_MAX_METHODS                     128
  76
  77 /* RMPP information */
  78 #define IB_MGMT_RMPP_VERSION                    1
  79
  80 #define IB_MGMT_RMPP_TYPE_DATA                  1
  81 #define IB_MGMT_RMPP_TYPE_ACK                   2
  82 #define IB_MGMT_RMPP_TYPE_STOP                  3
  83 #define IB_MGMT_RMPP_TYPE_ABORT                 4
  84
  85 #define IB_MGMT_RMPP_FLAG_ACTIVE                1
  86 #define IB_MGMT_RMPP_FLAG_FIRST                 (1<<1)
  87 #define IB_MGMT_RMPP_FLAG_LAST                  (1<<2)
  88
  89 #define IB_MGMT_RMPP_NO_RESPTIME                0x1F
  90
  91 #define IB_MGMT_RMPP_STATUS_SUCCESS             0
  92 #define IB_MGMT_RMPP_STATUS_RESX                1
  93 #define IB_MGMT_RMPP_STATUS_ABORT_MIN           118
  94 #define IB_MGMT_RMPP_STATUS_T2L                 118
  95 #define IB_MGMT_RMPP_STATUS_BAD_LEN             119
  96 #define IB_MGMT_RMPP_STATUS_BAD_SEG             120
  97 #define IB_MGMT_RMPP_STATUS_BADT                121
  98 #define IB_MGMT_RMPP_STATUS_W2S                 122
  99 #define IB_MGMT_RMPP_STATUS_S2B                 123
 100 #define IB_MGMT_RMPP_STATUS_BAD_STATUS          124
 101 #define IB_MGMT_RMPP_STATUS_UNV                 125
 102 #define IB_MGMT_RMPP_STATUS_TMR                 126
 103 #define IB_MGMT_RMPP_STATUS_UNSPEC              127
 104 #define IB_MGMT_RMPP_STATUS_ABORT_MAX           127
 105
 106 #define IB_QP0          0
 107 #define IB_QP1          __constant_htonl(1)
 108 #define IB_QP1_QKEY     0x80010000
 109 #define IB_QP_SET_QKEY  0x80000000
 110
 111 struct ib_mad_hdr {
 112         u8      base_version;
 113         u8      mgmt_class;
 114         u8      class_version;
 115         u8      method;
 116         __be16  status;
 117         __be16  class_specific;
 118         __be64  tid;
 119         __be16  attr_id;
 120         __be16  resv;
 121         __be32  attr_mod;
 122 };
 123
 124 struct ib_rmpp_hdr {
 125         u8      rmpp_version;
 126         u8      rmpp_type;
 127         u8      rmpp_rtime_flags;
 128         u8      rmpp_status;
 129         __be32  seg_num;
 130         __be32  paylen_newwin;
 131 };
 132
 133 typedef u64 __bitwise ib_sa_comp_mask;
 134
 135 #define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << n))
 136
 137 /*
 138  * ib_sa_hdr and ib_sa_mad structures must be packed because they have
 139  * 64-bit fields that are only 32-bit aligned. 64-bit architectures will
 140  * lay them out wrong otherwise.  (And unfortunately they are sent on
 141  * the wire so we can't change the layout)
 142  */
 143 struct ib_sa_hdr {
 144         __be64                  sm_key;
 145         __be16                  attr_offset;
 146         __be16                  reserved;
 147         ib_sa_comp_mask         comp_mask;
 148 } __attribute__ ((packed));
 149
 150 struct ib_mad {
 151         struct ib_mad_hdr       mad_hdr;
 152         u8                      data[232];
 153 };
 154
 155 struct ib_rmpp_mad {
 156         struct ib_mad_hdr       mad_hdr;
 157         struct ib_rmpp_hdr      rmpp_hdr;
 158         u8                      data[220];
 159 };
 160
 161 struct ib_sa_mad {
 162         struct ib_mad_hdr       mad_hdr;
 163         struct ib_rmpp_hdr      rmpp_hdr;
 164         struct ib_sa_hdr        sa_hdr;
 165         u8                      data[200];
 166 } __attribute__ ((packed));
 167
 168 struct ib_vendor_mad {
 169         struct ib_mad_hdr       mad_hdr;
 170         struct ib_rmpp_hdr      rmpp_hdr;
 171         u8                      reserved;
 172         u8                      oui[3];
 173         u8                      data[216];
 174 };
 175
 176 struct ib_class_port_info
 177 {
 178         u8                      base_version;
 179         u8                      class_version;
 180         __be16                  capability_mask;
 181         u8                      reserved[3];
 182         u8                      resp_time_value;
 183         u8                      redirect_gid[16];
 184         __be32                  redirect_tcslfl;
 185         __be16                  redirect_lid;
 186         __be16                  redirect_pkey;
 187         __be32                  redirect_qp;
 188         __be32                  redirect_qkey;
 189         u8                      trap_gid[16];
 190         __be32                  trap_tcslfl;
 191         __be16                  trap_lid;
 192         __be16                  trap_pkey;
 193         __be32                  trap_hlqp;
 194         __be32                  trap_qkey;
 195 };
 196
 197 /**
 198  * ib_mad_send_buf - MAD data buffer and work request for sends.
 199  * @mad: References an allocated MAD data buffer.  The size of the data
 200  *   buffer is specified in the @send_wr.length field.
 201  * @mapping: DMA mapping information.
 202  * @mad_agent: MAD agent that allocated the buffer.
 203  * @context: User-controlled context fields.
 204  * @send_wr: An initialized work request structure used when sending the MAD.
 205  *   The wr_id field of the work request is initialized to reference this
 206  *   data structure.
 207  * @sge: A scatter-gather list referenced by the work request.
 208  *
 209  * Users are responsible for initializing the MAD buffer itself, with the
 210  * exception of specifying the payload length field in any RMPP MAD.
 211  */
 212 struct ib_mad_send_buf {
 213         struct ib_mad           *mad;
 214         DECLARE_PCI_UNMAP_ADDR(mapping)
 215         struct ib_mad_agent     *mad_agent;
 216         void                    *context[2];
 217         struct ib_send_wr       send_wr;
 218         struct ib_sge           sge;
 219 };
 220
 221 /**
 222  * ib_get_rmpp_resptime - Returns the RMPP response time.
 223  * @rmpp_hdr: An RMPP header.
 224  */
 225 static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
 226 {
 227         return rmpp_hdr->rmpp_rtime_flags >> 3;
 228 }
 229
 230 /**
 231  * ib_get_rmpp_flags - Returns the RMPP flags.
 232  * @rmpp_hdr: An RMPP header.
 233  */
 234 static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
 235 {
 236         return rmpp_hdr->rmpp_rtime_flags & 0x7;
 237 }
 238
 239 /**
 240  * ib_set_rmpp_resptime - Sets the response time in an RMPP header.
 241  * @rmpp_hdr: An RMPP header.
 242  * @rtime: The response time to set.
 243  */
 244 static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
 245 {
 246         rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
 247 }
 248
 249 /**
 250  * ib_set_rmpp_flags - Sets the flags in an RMPP header.
 251  * @rmpp_hdr: An RMPP header.
 252  * @flags: The flags to set.
 253  */
 254 static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
 255 {
 256         rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF1) |
 257                                      (flags & 0x7);
 258 }
 259
 260 struct ib_mad_agent;
 261 struct ib_mad_send_wc;
 262 struct ib_mad_recv_wc;
 263
 264 /**
 265  * ib_mad_send_handler - callback handler for a sent MAD.
 266  * @mad_agent: MAD agent that sent the MAD.
 267  * @mad_send_wc: Send work completion information on the sent MAD.
 268  */
 269 typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
 270                                     struct ib_mad_send_wc *mad_send_wc);
 271
 272 /**
 273  * ib_mad_snoop_handler - Callback handler for snooping sent MADs.
 274  * @mad_agent: MAD agent that snooped the MAD.
 275  * @send_wr: Work request information on the sent MAD.
 276  * @mad_send_wc: Work completion information on the sent MAD.  Valid
 277  *   only for snooping that occurs on a send completion.
 278  *
 279  * Clients snooping MADs should not modify data referenced by the @send_wr
 280  * or @mad_send_wc.
 281  */
 282 typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,
 283                                      struct ib_send_wr *send_wr,
 284                                      struct ib_mad_send_wc *mad_send_wc);
 285
 286 /**
 287  * ib_mad_recv_handler - callback handler for a received MAD.
 288  * @mad_agent: MAD agent requesting the received MAD.
 289  * @mad_recv_wc: Received work completion information on the received MAD.
 290  *
 291  * MADs received in response to a send request operation will be handed to
 292  * the user after the send operation completes.  All data buffers given
 293  * to registered agents through this routine are owned by the receiving
 294  * client, except for snooping agents.  Clients snooping MADs should not
 295  * modify the data referenced by @mad_recv_wc.
 296  */
 297 typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
 298                                     struct ib_mad_recv_wc *mad_recv_wc);
 299
 300 /**
 301  * ib_mad_agent - Used to track MAD registration with the access layer.
 302  * @device: Reference to device registration is on.
 303  * @qp: Reference to QP used for sending and receiving MADs.
 304  * @mr: Memory region for system memory usable for DMA.
 305  * @recv_handler: Callback handler for a received MAD.
 306  * @send_handler: Callback handler for a sent MAD.
 307  * @snoop_handler: Callback handler for snooped sent MADs.
 308  * @context: User-specified context associated with this registration.
 309  * @hi_tid: Access layer assigned transaction ID for this client.
 310  *   Unsolicited MADs sent by this client will have the upper 32-bits
 311  *   of their TID set to this value.
 312  * @port_num: Port number on which QP is registered
 313  * @rmpp_version: If set, indicates the RMPP version used by this agent.
 314  */
 315 struct ib_mad_agent {
 316         struct ib_device        *device;
 317         struct ib_qp            *qp;
 318         struct ib_mr            *mr;
 319         ib_mad_recv_handler     recv_handler;
 320         ib_mad_send_handler     send_handler;
 321         ib_mad_snoop_handler    snoop_handler;
 322         void                    *context;
 323         u32                     hi_tid;
 324         u8                      port_num;
 325         u8                      rmpp_version;
 326 };
 327
 328 /**
 329  * ib_mad_send_wc - MAD send completion information.
 330  * @wr_id: Work request identifier associated with the send MAD request.
 331  * @status: Completion status.
 332  * @vendor_err: Optional vendor error information returned with a failed
 333  *   request.
 334  */
 335 struct ib_mad_send_wc {
 336         u64                     wr_id;
 337         enum ib_wc_status       status;
 338         u32                     vendor_err;
 339 };
 340
 341 /**
 342  * ib_mad_recv_buf - received MAD buffer information.
 343  * @list: Reference to next data buffer for a received RMPP MAD.
 344  * @grh: References a data buffer containing the global route header.
 345  *   The data refereced by this buffer is only valid if the GRH is
 346  *   valid.
 347  * @mad: References the start of the received MAD.
 348  */
 349 struct ib_mad_recv_buf {
 350         struct list_head        list;
 351         struct ib_grh           *grh;
 352         struct ib_mad           *mad;
 353 };
 354
 355 /**
 356  * ib_mad_recv_wc - received MAD information.
 357  * @wc: Completion information for the received data.
 358  * @recv_buf: Specifies the location of the received data buffer(s).
 359  * @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.
 360  * @mad_len: The length of the received MAD, without duplicated headers.
 361  *
 362  * For received response, the wr_id field of the wc is set to the wr_id
 363  *   for the corresponding send request.
 364  */
 365 struct ib_mad_recv_wc {
 366         struct ib_wc            *wc;
 367         struct ib_mad_recv_buf  recv_buf;
 368         struct list_head        rmpp_list;
 369         int                     mad_len;
 370 };
 371
 372 /**
 373  * ib_mad_reg_req - MAD registration request
 374  * @mgmt_class: Indicates which management class of MADs should be receive
 375  *   by the caller.  This field is only required if the user wishes to
 376  *   receive unsolicited MADs, otherwise it should be 0.
 377  * @mgmt_class_version: Indicates which version of MADs for the given
 378  *   management class to receive.
 379  * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
 380  *   in the range from 0x30 to 0x4f. Otherwise not used.
 381  * @method_mask: The caller will receive unsolicited MADs for any method
 382  *   where @method_mask = 1.
 383  */
 384 struct ib_mad_reg_req {
 385         u8      mgmt_class;
 386         u8      mgmt_class_version;
 387         u8      oui[3];
 388         DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
 389 };
 390
 391 /**
 392  * ib_register_mad_agent - Register to send/receive MADs.
 393  * @device: The device to register with.
 394  * @port_num: The port on the specified device to use.
 395  * @qp_type: Specifies which QP to access.  Must be either
 396  *   IB_QPT_SMI or IB_QPT_GSI.
 397  * @mad_reg_req: Specifies which unsolicited MADs should be received
 398  *   by the caller.  This parameter may be NULL if the caller only
 399  *   wishes to receive solicited responses.
 400  * @rmpp_version: If set, indicates that the client will send
 401  *   and receive MADs that contain the RMPP header for the given version.
 402  *   If set to 0, indicates that RMPP is not used by this client.
 403  * @send_handler: The completion callback routine invoked after a send
 404  *   request has completed.
 405  * @recv_handler: The completion callback routine invoked for a received
 406  *   MAD.
 407  * @context: User specified context associated with the registration.
 408  */
 409 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
 410                                            u8 port_num,
 411                                            enum ib_qp_type qp_type,
 412                                            struct ib_mad_reg_req *mad_reg_req,
 413                                            u8 rmpp_version,
 414                                            ib_mad_send_handler send_handler,
 415                                            ib_mad_recv_handler recv_handler,
 416                                            void *context);
 417
 418 enum ib_mad_snoop_flags {
 419         /*IB_MAD_SNOOP_POSTED_SENDS        = 1,*/
 420         /*IB_MAD_SNOOP_RMPP_SENDS          = (1<<1),*/
 421         IB_MAD_SNOOP_SEND_COMPLETIONS      = (1<<2),
 422         /*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
 423         IB_MAD_SNOOP_RECVS                 = (1<<4)
 424         /*IB_MAD_SNOOP_RMPP_RECVS          = (1<<5),*/
 425         /*IB_MAD_SNOOP_REDIRECTED_QPS      = (1<<6)*/
 426 };
 427
 428 /**
 429  * ib_register_mad_snoop - Register to snoop sent and received MADs.
 430  * @device: The device to register with.
 431  * @port_num: The port on the specified device to use.
 432  * @qp_type: Specifies which QP traffic to snoop.  Must be either
 433  *   IB_QPT_SMI or IB_QPT_GSI.
 434  * @mad_snoop_flags: Specifies information where snooping occurs.
 435  * @send_handler: The callback routine invoked for a snooped send.
 436  * @recv_handler: The callback routine invoked for a snooped receive.
 437  * @context: User specified context associated with the registration.
 438  */
 439 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
 440                                            u8 port_num,
 441                                            enum ib_qp_type qp_type,
 442                                            int mad_snoop_flags,
 443                                            ib_mad_snoop_handler snoop_handler,
 444                                            ib_mad_recv_handler recv_handler,
 445                                            void *context);
 446
 447 /**
 448  * ib_unregister_mad_agent - Unregisters a client from using MAD services.
 449  * @mad_agent: Corresponding MAD registration request to deregister.
 450  *
 451  * After invoking this routine, MAD services are no longer usable by the
 452  * client on the associated QP.
 453  */
 454 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);
 455
 456 /**
 457  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 458  *   with the registered client.
 459  * @mad_agent: Specifies the associated registration to post the send to.
 460  * @send_wr: Specifies the information needed to send the MAD(s).
 461  * @bad_send_wr: Specifies the MAD on which an error was encountered.
 462  *
 463  * Sent MADs are not guaranteed to complete in the order that they were posted.
 464  *
 465  * If the MAD requires RMPP, the data buffer should contain a single copy
 466  * of the common MAD, RMPP, and class specific headers, followed by the class
 467  * defined data.  If the class defined data would not divide evenly into
 468  * RMPP segments, then space must be allocated at the end of the referenced
 469  * buffer for any required padding.  To indicate the amount of class defined
 470  * data being transferred, the paylen_newwin field in the RMPP header should
 471  * be set to the size of the class specific header plus the amount of class
 472  * defined data being transferred.  The paylen_newwin field should be
 473  * specified in network-byte order.
 474  */
 475 int ib_post_send_mad(struct ib_mad_agent *mad_agent,
 476                      struct ib_send_wr *send_wr,
 477                      struct ib_send_wr **bad_send_wr);
 478
 479 /**
 480  * ib_coalesce_recv_mad - Coalesces received MAD data into a single buffer.
 481  * @mad_recv_wc: Work completion information for a received MAD.
 482  * @buf: User-provided data buffer to receive the coalesced buffers.  The
 483  *   referenced buffer should be at least the size of the mad_len specified
 484  *   by @mad_recv_wc.
 485  *
 486  * This call copies a chain of received MAD segments into a single data buffer,
 487  * removing duplicated headers.
 488  */
 489 void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc, void *buf);
 490
 491 /**
 492  * ib_free_recv_mad - Returns data buffers used to receive a MAD.
 493  * @mad_recv_wc: Work completion information for a received MAD.
 494  *
 495  * Clients receiving MADs through their ib_mad_recv_handler must call this
 496  * routine to return the work completion buffers to the access layer.
 497  */
 498 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);
 499
 500 /**
 501  * ib_cancel_mad - Cancels an outstanding send MAD operation.
 502  * @mad_agent: Specifies the registration associated with sent MAD.
 503  * @wr_id: Indicates the work request identifier of the MAD to cancel.
 504  *
 505  * MADs will be returned to the user through the corresponding
 506  * ib_mad_send_handler.
 507  */
 508 void ib_cancel_mad(struct ib_mad_agent *mad_agent, u64 wr_id);
 509
 510 /**
 511  * ib_modify_mad - Modifies an outstanding send MAD operation.
 512  * @mad_agent: Specifies the registration associated with sent MAD.
 513  * @wr_id: Indicates the work request identifier of the MAD to modify.
 514  * @timeout_ms: New timeout value for sent MAD.
 515  *
 516  * This call will reset the timeout value for a sent MAD to the specified
 517  * value.
 518  */
 519 int ib_modify_mad(struct ib_mad_agent *mad_agent, u64 wr_id, u32 timeout_ms);
 520
 521 /**
 522  * ib_redirect_mad_qp - Registers a QP for MAD services.
 523  * @qp: Reference to a QP that requires MAD services.
 524  * @rmpp_version: If set, indicates that the client will send
 525  *   and receive MADs that contain the RMPP header for the given version.
 526  *   If set to 0, indicates that RMPP is not used by this client.
 527  * @send_handler: The completion callback routine invoked after a send
 528  *   request has completed.
 529  * @recv_handler: The completion callback routine invoked for a received
 530  *   MAD.
 531  * @context: User specified context associated with the registration.
 532  *
 533  * Use of this call allows clients to use MAD services, such as RMPP,
 534  * on user-owned QPs.  After calling this routine, users may send
 535  * MADs on the specified QP by calling ib_mad_post_send.
 536  */
 537 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
 538                                         u8 rmpp_version,
 539                                         ib_mad_send_handler send_handler,
 540                                         ib_mad_recv_handler recv_handler,
 541                                         void *context);
 542
 543 /**
 544  * ib_process_mad_wc - Processes a work completion associated with a
 545  *   MAD sent or received on a redirected QP.
 546  * @mad_agent: Specifies the registered MAD service using the redirected QP.
 547  * @wc: References a work completion associated with a sent or received
 548  *   MAD segment.
 549  *
 550  * This routine is used to complete or continue processing on a MAD request.
 551  * If the work completion is associated with a send operation, calling
 552  * this routine is required to continue an RMPP transfer or to wait for a
 553  * corresponding response, if it is a request.  If the work completion is
 554  * associated with a receive operation, calling this routine is required to
 555  * process an inbound or outbound RMPP transfer, or to match a response MAD
 556  * with its corresponding request.
 557  */
 558 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
 559                       struct ib_wc *wc);
 560
 561 /**
 562  * ib_create_send_mad - Allocate and initialize a data buffer and work request
 563  *   for sending a MAD.
 564  * @mad_agent: Specifies the registered MAD service to associate with the MAD.
 565  * @remote_qpn: Specifies the QPN of the receiving node.
 566  * @pkey_index: Specifies which PKey the MAD will be sent using.  This field
 567  *   is valid only if the remote_qpn is QP 1.
 568  * @ah: References the address handle used to transfer to the remote node.
 569  * @rmpp_active: Indicates if the send will enable RMPP.
 570  * @hdr_len: Indicates the size of the data header of the MAD.  This length
 571  *   should include the common MAD header, RMPP header, plus any class
 572  *   specific header.
 573  * @data_len: Indicates the size of any user-transferred data.  The call will
 574  *   automatically adjust the allocated buffer size to account for any
 575  *   additional padding that may be necessary.
 576  * @gfp_mask: GFP mask used for the memory allocation.
 577  *
 578  * This is a helper routine that may be used to allocate a MAD.  Users are
 579  * not required to allocate outbound MADs using this call.  The returned
 580  * MAD send buffer will reference a data buffer usable for sending a MAD, along
 581  * with an initialized work request structure.  Users may modify the returned
 582  * MAD data buffer or work request before posting the send.
 583  *
 584  * The returned data buffer will be cleared.  Users are responsible for
 585  * initializing the common MAD and any class specific headers.  If @rmpp_active
 586  * is set, the RMPP header will be initialized for sending.
 587  */
 588 struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
 589                                             u32 remote_qpn, u16 pkey_index,
 590                                             struct ib_ah *ah, int rmpp_active,
 591                                             int hdr_len, int data_len,
 592                                             unsigned int __nocast gfp_mask);
 593
 594 /**
 595  * ib_free_send_mad - Returns data buffers used to send a MAD.
 596  * @send_buf: Previously allocated send data buffer.
 597  */
 598 void ib_free_send_mad(struct ib_mad_send_buf *send_buf);
 599
 600 #endif /* IB_MAD_H */