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linux/include/rdma/ib_mad.h
Ira Weiny 1471cb6ca6 IB/mad: Add user space RMPP support 
Using the new registration mechanism, define a flag that indicates the
user wishes to process RMPP messages in user space rather than have
the kernel process them.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
2014-08-10 20:36:00 -07:00

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/*
* Copyright (c) 2004 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2004 Infinicon Corporation. All rights reserved.
* Copyright (c) 2004 Intel Corporation. All rights reserved.
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2004-2006 Voltaire Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#if !defined(IB_MAD_H)
#define IB_MAD_H
#include <linux/list.h>
#include <rdma/ib_verbs.h>
#include <uapi/rdma/ib_user_mad.h>
/* Management base version */
#define IB_MGMT_BASE_VERSION 1
/* Management classes */
#define IB_MGMT_CLASS_SUBN_LID_ROUTED 0x01
#define IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE 0x81
#define IB_MGMT_CLASS_SUBN_ADM 0x03
#define IB_MGMT_CLASS_PERF_MGMT 0x04
#define IB_MGMT_CLASS_BM 0x05
#define IB_MGMT_CLASS_DEVICE_MGMT 0x06
#define IB_MGMT_CLASS_CM 0x07
#define IB_MGMT_CLASS_SNMP 0x08
#define IB_MGMT_CLASS_DEVICE_ADM 0x10
#define IB_MGMT_CLASS_BOOT_MGMT 0x11
#define IB_MGMT_CLASS_BIS 0x12
#define IB_MGMT_CLASS_CONG_MGMT 0x21
#define IB_MGMT_CLASS_VENDOR_RANGE2_START 0x30
#define IB_MGMT_CLASS_VENDOR_RANGE2_END 0x4F
#define IB_OPENIB_OUI (0x001405)
/* Management methods */
#define IB_MGMT_METHOD_GET 0x01
#define IB_MGMT_METHOD_SET 0x02
#define IB_MGMT_METHOD_GET_RESP 0x81
#define IB_MGMT_METHOD_SEND 0x03
#define IB_MGMT_METHOD_TRAP 0x05
#define IB_MGMT_METHOD_REPORT 0x06
#define IB_MGMT_METHOD_REPORT_RESP 0x86
#define IB_MGMT_METHOD_TRAP_REPRESS 0x07
#define IB_MGMT_METHOD_RESP 0x80
#define IB_BM_ATTR_MOD_RESP cpu_to_be32(1)
#define IB_MGMT_MAX_METHODS 128
/* MAD Status field bit masks */
#define IB_MGMT_MAD_STATUS_SUCCESS 0x0000
#define IB_MGMT_MAD_STATUS_BUSY 0x0001
#define IB_MGMT_MAD_STATUS_REDIRECT_REQD 0x0002
#define IB_MGMT_MAD_STATUS_BAD_VERSION 0x0004
#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD 0x0008
#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB 0x000c
#define IB_MGMT_MAD_STATUS_INVALID_ATTRIB_VALUE 0x001c
/* RMPP information */
#define IB_MGMT_RMPP_VERSION 1
#define IB_MGMT_RMPP_TYPE_DATA 1
#define IB_MGMT_RMPP_TYPE_ACK 2
#define IB_MGMT_RMPP_TYPE_STOP 3
#define IB_MGMT_RMPP_TYPE_ABORT 4
#define IB_MGMT_RMPP_FLAG_ACTIVE 1
#define IB_MGMT_RMPP_FLAG_FIRST (1<<1)
#define IB_MGMT_RMPP_FLAG_LAST (1<<2)
#define IB_MGMT_RMPP_NO_RESPTIME 0x1F
#define IB_MGMT_RMPP_STATUS_SUCCESS 0
#define IB_MGMT_RMPP_STATUS_RESX 1
#define IB_MGMT_RMPP_STATUS_ABORT_MIN 118
#define IB_MGMT_RMPP_STATUS_T2L 118
#define IB_MGMT_RMPP_STATUS_BAD_LEN 119
#define IB_MGMT_RMPP_STATUS_BAD_SEG 120
#define IB_MGMT_RMPP_STATUS_BADT 121
#define IB_MGMT_RMPP_STATUS_W2S 122
#define IB_MGMT_RMPP_STATUS_S2B 123
#define IB_MGMT_RMPP_STATUS_BAD_STATUS 124
#define IB_MGMT_RMPP_STATUS_UNV 125
#define IB_MGMT_RMPP_STATUS_TMR 126
#define IB_MGMT_RMPP_STATUS_UNSPEC 127
#define IB_MGMT_RMPP_STATUS_ABORT_MAX 127
#define IB_QP0 0
#define IB_QP1 cpu_to_be32(1)
#define IB_QP1_QKEY 0x80010000
#define IB_QP_SET_QKEY 0x80000000
#define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
#define IB_DEFAULT_PKEY_FULL 0xFFFF
enum {
IB_MGMT_MAD_HDR = 24,
IB_MGMT_MAD_DATA = 232,
IB_MGMT_RMPP_HDR = 36,
IB_MGMT_RMPP_DATA = 220,
IB_MGMT_VENDOR_HDR = 40,
IB_MGMT_VENDOR_DATA = 216,
IB_MGMT_SA_HDR = 56,
IB_MGMT_SA_DATA = 200,
IB_MGMT_DEVICE_HDR = 64,
IB_MGMT_DEVICE_DATA = 192,
};
struct ib_mad_hdr {
u8 base_version;
u8 mgmt_class;
u8 class_version;
u8 method;
__be16 status;
__be16 class_specific;
__be64 tid;
__be16 attr_id;
__be16 resv;
__be32 attr_mod;
};
struct ib_rmpp_hdr {
u8 rmpp_version;
u8 rmpp_type;
u8 rmpp_rtime_flags;
u8 rmpp_status;
__be32 seg_num;
__be32 paylen_newwin;
};
typedef u64 __bitwise ib_sa_comp_mask;
#define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << (n)))
/*
* ib_sa_hdr and ib_sa_mad structures must be packed because they have
* 64-bit fields that are only 32-bit aligned. 64-bit architectures will
* lay them out wrong otherwise. (And unfortunately they are sent on
* the wire so we can't change the layout)
*/
struct ib_sa_hdr {
__be64 sm_key;
__be16 attr_offset;
__be16 reserved;
ib_sa_comp_mask comp_mask;
} __attribute__ ((packed));
struct ib_mad {
struct ib_mad_hdr mad_hdr;
u8 data[IB_MGMT_MAD_DATA];
};
struct ib_rmpp_mad {
struct ib_mad_hdr mad_hdr;
struct ib_rmpp_hdr rmpp_hdr;
u8 data[IB_MGMT_RMPP_DATA];
};
struct ib_sa_mad {
struct ib_mad_hdr mad_hdr;
struct ib_rmpp_hdr rmpp_hdr;
struct ib_sa_hdr sa_hdr;
u8 data[IB_MGMT_SA_DATA];
} __attribute__ ((packed));
struct ib_vendor_mad {
struct ib_mad_hdr mad_hdr;
struct ib_rmpp_hdr rmpp_hdr;
u8 reserved;
u8 oui[3];
u8 data[IB_MGMT_VENDOR_DATA];
};
struct ib_class_port_info {
u8 base_version;
u8 class_version;
__be16 capability_mask;
u8 reserved[3];
u8 resp_time_value;
u8 redirect_gid[16];
__be32 redirect_tcslfl;
__be16 redirect_lid;
__be16 redirect_pkey;
__be32 redirect_qp;
__be32 redirect_qkey;
u8 trap_gid[16];
__be32 trap_tcslfl;
__be16 trap_lid;
__be16 trap_pkey;
__be32 trap_hlqp;
__be32 trap_qkey;
};
/**
* ib_mad_send_buf - MAD data buffer and work request for sends.
* @next: A pointer used to chain together MADs for posting.
* @mad: References an allocated MAD data buffer for MADs that do not have
* RMPP active. For MADs using RMPP, references the common and management
* class specific headers.
* @mad_agent: MAD agent that allocated the buffer.
* @ah: The address handle to use when sending the MAD.
* @context: User-controlled context fields.
* @hdr_len: Indicates the size of the data header of the MAD. This length
* includes the common MAD, RMPP, and class specific headers.
* @data_len: Indicates the total size of user-transferred data.
* @seg_count: The number of RMPP segments allocated for this send.
* @seg_size: Size of each RMPP segment.
* @timeout_ms: Time to wait for a response.
* @retries: Number of times to retry a request for a response. For MADs
* using RMPP, this applies per window. On completion, returns the number
* of retries needed to complete the transfer.
*
* Users are responsible for initializing the MAD buffer itself, with the
* exception of any RMPP header. Additional segment buffer space allocated
* beyond data_len is padding.
*/
struct ib_mad_send_buf {
struct ib_mad_send_buf *next;
void *mad;
struct ib_mad_agent *mad_agent;
struct ib_ah *ah;
void *context[2];
int hdr_len;
int data_len;
int seg_count;
int seg_size;
int timeout_ms;
int retries;
};
/**
* ib_response_mad - Returns if the specified MAD has been generated in
* response to a sent request or trap.
*/
int ib_response_mad(struct ib_mad *mad);
/**
* ib_get_rmpp_resptime - Returns the RMPP response time.
* @rmpp_hdr: An RMPP header.
*/
static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
{
return rmpp_hdr->rmpp_rtime_flags >> 3;
}
/**
* ib_get_rmpp_flags - Returns the RMPP flags.
* @rmpp_hdr: An RMPP header.
*/
static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
{
return rmpp_hdr->rmpp_rtime_flags & 0x7;
}
/**
* ib_set_rmpp_resptime - Sets the response time in an RMPP header.
* @rmpp_hdr: An RMPP header.
* @rtime: The response time to set.
*/
static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
{
rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
}
/**
* ib_set_rmpp_flags - Sets the flags in an RMPP header.
* @rmpp_hdr: An RMPP header.
* @flags: The flags to set.
*/
static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
{
rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF8) |
(flags & 0x7);
}
struct ib_mad_agent;
struct ib_mad_send_wc;
struct ib_mad_recv_wc;
/**
* ib_mad_send_handler - callback handler for a sent MAD.
* @mad_agent: MAD agent that sent the MAD.
* @mad_send_wc: Send work completion information on the sent MAD.
*/
typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
struct ib_mad_send_wc *mad_send_wc);
/**
* ib_mad_snoop_handler - Callback handler for snooping sent MADs.
* @mad_agent: MAD agent that snooped the MAD.
* @send_wr: Work request information on the sent MAD.
* @mad_send_wc: Work completion information on the sent MAD. Valid
* only for snooping that occurs on a send completion.
*
* Clients snooping MADs should not modify data referenced by the @send_wr
* or @mad_send_wc.
*/
typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,
struct ib_mad_send_buf *send_buf,
struct ib_mad_send_wc *mad_send_wc);
/**
* ib_mad_recv_handler - callback handler for a received MAD.
* @mad_agent: MAD agent requesting the received MAD.
* @mad_recv_wc: Received work completion information on the received MAD.
*
* MADs received in response to a send request operation will be handed to
* the user before the send operation completes. All data buffers given
* to registered agents through this routine are owned by the receiving
* client, except for snooping agents. Clients snooping MADs should not
* modify the data referenced by @mad_recv_wc.
*/
typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
struct ib_mad_recv_wc *mad_recv_wc);
/**
* ib_mad_agent - Used to track MAD registration with the access layer.
* @device: Reference to device registration is on.
* @qp: Reference to QP used for sending and receiving MADs.
* @mr: Memory region for system memory usable for DMA.
* @recv_handler: Callback handler for a received MAD.
* @send_handler: Callback handler for a sent MAD.
* @snoop_handler: Callback handler for snooped sent MADs.
* @context: User-specified context associated with this registration.
* @hi_tid: Access layer assigned transaction ID for this client.
* Unsolicited MADs sent by this client will have the upper 32-bits
* of their TID set to this value.
* @flags: registration flags
* @port_num: Port number on which QP is registered
* @rmpp_version: If set, indicates the RMPP version used by this agent.
*/
enum {
IB_MAD_USER_RMPP = IB_USER_MAD_USER_RMPP,
};
struct ib_mad_agent {
struct ib_device *device;
struct ib_qp *qp;
struct ib_mr *mr;
ib_mad_recv_handler recv_handler;
ib_mad_send_handler send_handler;
ib_mad_snoop_handler snoop_handler;
void *context;
u32 hi_tid;
u32 flags;
u8 port_num;
u8 rmpp_version;
};
/**
* ib_mad_send_wc - MAD send completion information.
* @send_buf: Send MAD data buffer associated with the send MAD request.
* @status: Completion status.
* @vendor_err: Optional vendor error information returned with a failed
* request.
*/
struct ib_mad_send_wc {
struct ib_mad_send_buf *send_buf;
enum ib_wc_status status;
u32 vendor_err;
};
/**
* ib_mad_recv_buf - received MAD buffer information.
* @list: Reference to next data buffer for a received RMPP MAD.
* @grh: References a data buffer containing the global route header.
* The data refereced by this buffer is only valid if the GRH is
* valid.
* @mad: References the start of the received MAD.
*/
struct ib_mad_recv_buf {
struct list_head list;
struct ib_grh *grh;
struct ib_mad *mad;
};
/**
* ib_mad_recv_wc - received MAD information.
* @wc: Completion information for the received data.
* @recv_buf: Specifies the location of the received data buffer(s).
* @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.
* @mad_len: The length of the received MAD, without duplicated headers.
*
* For received response, the wr_id contains a pointer to the ib_mad_send_buf
* for the corresponding send request.
*/
struct ib_mad_recv_wc {
struct ib_wc *wc;
struct ib_mad_recv_buf recv_buf;
struct list_head rmpp_list;
int mad_len;
};
/**
* ib_mad_reg_req - MAD registration request
* @mgmt_class: Indicates which management class of MADs should be receive
* by the caller. This field is only required if the user wishes to
* receive unsolicited MADs, otherwise it should be 0.
* @mgmt_class_version: Indicates which version of MADs for the given
* management class to receive.
* @oui: Indicates IEEE OUI when mgmt_class is a vendor class
* in the range from 0x30 to 0x4f. Otherwise not used.
* @method_mask: The caller will receive unsolicited MADs for any method
* where @method_mask = 1.
*
*/
struct ib_mad_reg_req {
u8 mgmt_class;
u8 mgmt_class_version;
u8 oui[3];
DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
};
/**
* ib_register_mad_agent - Register to send/receive MADs.
* @device: The device to register with.
* @port_num: The port on the specified device to use.
* @qp_type: Specifies which QP to access. Must be either
* IB_QPT_SMI or IB_QPT_GSI.
* @mad_reg_req: Specifies which unsolicited MADs should be received
* by the caller. This parameter may be NULL if the caller only
* wishes to receive solicited responses.
* @rmpp_version: If set, indicates that the client will send
* and receive MADs that contain the RMPP header for the given version.
* If set to 0, indicates that RMPP is not used by this client.
* @send_handler: The completion callback routine invoked after a send
* request has completed.
* @recv_handler: The completion callback routine invoked for a received
* MAD.
* @context: User specified context associated with the registration.
* @registration_flags: Registration flags to set for this agent
*/
struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
u8 port_num,
enum ib_qp_type qp_type,
struct ib_mad_reg_req *mad_reg_req,
u8 rmpp_version,
ib_mad_send_handler send_handler,
ib_mad_recv_handler recv_handler,
void *context,
u32 registration_flags);
enum ib_mad_snoop_flags {
/*IB_MAD_SNOOP_POSTED_SENDS = 1,*/
/*IB_MAD_SNOOP_RMPP_SENDS = (1<<1),*/
IB_MAD_SNOOP_SEND_COMPLETIONS = (1<<2),
/*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
IB_MAD_SNOOP_RECVS = (1<<4)
/*IB_MAD_SNOOP_RMPP_RECVS = (1<<5),*/
/*IB_MAD_SNOOP_REDIRECTED_QPS = (1<<6)*/
};
/**
* ib_register_mad_snoop - Register to snoop sent and received MADs.
* @device: The device to register with.
* @port_num: The port on the specified device to use.
* @qp_type: Specifies which QP traffic to snoop. Must be either
* IB_QPT_SMI or IB_QPT_GSI.
* @mad_snoop_flags: Specifies information where snooping occurs.
* @send_handler: The callback routine invoked for a snooped send.
* @recv_handler: The callback routine invoked for a snooped receive.
* @context: User specified context associated with the registration.
*/
struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
u8 port_num,
enum ib_qp_type qp_type,
int mad_snoop_flags,
ib_mad_snoop_handler snoop_handler,
ib_mad_recv_handler recv_handler,
void *context);
/**
* ib_unregister_mad_agent - Unregisters a client from using MAD services.
* @mad_agent: Corresponding MAD registration request to deregister.
*
* After invoking this routine, MAD services are no longer usable by the
* client on the associated QP.
*/
int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);
/**
* ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
* with the registered client.
* @send_buf: Specifies the information needed to send the MAD(s).
* @bad_send_buf: Specifies the MAD on which an error was encountered. This
* parameter is optional if only a single MAD is posted.
*
* Sent MADs are not guaranteed to complete in the order that they were posted.
*
* If the MAD requires RMPP, the data buffer should contain a single copy
* of the common MAD, RMPP, and class specific headers, followed by the class
* defined data. If the class defined data would not divide evenly into
* RMPP segments, then space must be allocated at the end of the referenced
* buffer for any required padding. To indicate the amount of class defined
* data being transferred, the paylen_newwin field in the RMPP header should
* be set to the size of the class specific header plus the amount of class
* defined data being transferred. The paylen_newwin field should be
* specified in network-byte order.
*/
int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
struct ib_mad_send_buf **bad_send_buf);
/**
* ib_free_recv_mad - Returns data buffers used to receive a MAD.
* @mad_recv_wc: Work completion information for a received MAD.
*
* Clients receiving MADs through their ib_mad_recv_handler must call this
* routine to return the work completion buffers to the access layer.
*/
void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);
/**
* ib_cancel_mad - Cancels an outstanding send MAD operation.
* @mad_agent: Specifies the registration associated with sent MAD.
* @send_buf: Indicates the MAD to cancel.
*
* MADs will be returned to the user through the corresponding
* ib_mad_send_handler.
*/
void ib_cancel_mad(struct ib_mad_agent *mad_agent,
struct ib_mad_send_buf *send_buf);
/**
* ib_modify_mad - Modifies an outstanding send MAD operation.
* @mad_agent: Specifies the registration associated with sent MAD.
* @send_buf: Indicates the MAD to modify.
* @timeout_ms: New timeout value for sent MAD.
*
* This call will reset the timeout value for a sent MAD to the specified
* value.
*/
int ib_modify_mad(struct ib_mad_agent *mad_agent,
struct ib_mad_send_buf *send_buf, u32 timeout_ms);
/**
* ib_redirect_mad_qp - Registers a QP for MAD services.
* @qp: Reference to a QP that requires MAD services.
* @rmpp_version: If set, indicates that the client will send
* and receive MADs that contain the RMPP header for the given version.
* If set to 0, indicates that RMPP is not used by this client.
* @send_handler: The completion callback routine invoked after a send
* request has completed.
* @recv_handler: The completion callback routine invoked for a received
* MAD.
* @context: User specified context associated with the registration.
*
* Use of this call allows clients to use MAD services, such as RMPP,
* on user-owned QPs. After calling this routine, users may send
* MADs on the specified QP by calling ib_mad_post_send.
*/
struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
u8 rmpp_version,
ib_mad_send_handler send_handler,
ib_mad_recv_handler recv_handler,
void *context);
/**
* ib_process_mad_wc - Processes a work completion associated with a
* MAD sent or received on a redirected QP.
* @mad_agent: Specifies the registered MAD service using the redirected QP.
* @wc: References a work completion associated with a sent or received
* MAD segment.
*
* This routine is used to complete or continue processing on a MAD request.
* If the work completion is associated with a send operation, calling
* this routine is required to continue an RMPP transfer or to wait for a
* corresponding response, if it is a request. If the work completion is
* associated with a receive operation, calling this routine is required to
* process an inbound or outbound RMPP transfer, or to match a response MAD
* with its corresponding request.
*/
int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
struct ib_wc *wc);
/**
* ib_create_send_mad - Allocate and initialize a data buffer and work request
* for sending a MAD.
* @mad_agent: Specifies the registered MAD service to associate with the MAD.
* @remote_qpn: Specifies the QPN of the receiving node.
* @pkey_index: Specifies which PKey the MAD will be sent using. This field
* is valid only if the remote_qpn is QP 1.
* @rmpp_active: Indicates if the send will enable RMPP.
* @hdr_len: Indicates the size of the data header of the MAD. This length
* should include the common MAD header, RMPP header, plus any class
* specific header.
* @data_len: Indicates the size of any user-transferred data. The call will
* automatically adjust the allocated buffer size to account for any
* additional padding that may be necessary.
* @gfp_mask: GFP mask used for the memory allocation.
*
* This routine allocates a MAD for sending. The returned MAD send buffer
* will reference a data buffer usable for sending a MAD, along
* with an initialized work request structure. Users may modify the returned
* MAD data buffer before posting the send.
*
* The returned MAD header, class specific headers, and any padding will be
* cleared. Users are responsible for initializing the common MAD header,
* any class specific header, and MAD data area.
* If @rmpp_active is set, the RMPP header will be initialized for sending.
*/
struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
u32 remote_qpn, u16 pkey_index,
int rmpp_active,
int hdr_len, int data_len,
gfp_t gfp_mask);
/**
* ib_is_mad_class_rmpp - returns whether given management class
* supports RMPP.
* @mgmt_class: management class
*
* This routine returns whether the management class supports RMPP.
*/
int ib_is_mad_class_rmpp(u8 mgmt_class);
/**
* ib_get_mad_data_offset - returns the data offset for a given
* management class.
* @mgmt_class: management class
*
* This routine returns the data offset in the MAD for the management
* class requested.
*/
int ib_get_mad_data_offset(u8 mgmt_class);
/**
* ib_get_rmpp_segment - returns the data buffer for a given RMPP segment.
* @send_buf: Previously allocated send data buffer.
* @seg_num: number of segment to return
*
* This routine returns a pointer to the data buffer of an RMPP MAD.
* Users must provide synchronization to @send_buf around this call.
*/
void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num);
/**
* ib_free_send_mad - Returns data buffers used to send a MAD.
* @send_buf: Previously allocated send data buffer.
*/
void ib_free_send_mad(struct ib_mad_send_buf *send_buf);
/**
* ib_mad_kernel_rmpp_agent - Returns if the agent is performing RMPP.
* @agent: the agent in question
* @return: true if agent is performing rmpp, false otherwise.
*/
int ib_mad_kernel_rmpp_agent(struct ib_mad_agent *agent);
#endif /* IB_MAD_H */
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