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CIFS: SMBD: Add SMB Direct protocol initial values and constants

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To prepare for protocol implementation, add constants and user-configurable
values for the SMB Direct protocol.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber.redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
This commit is contained in:
Long Li 2017-11-07 01:54:56 -07:00 committed by Steve French
parent 8339dd32fb
commit 03bee01d62
2 changed files with 98 additions and 0 deletions
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77
fs/cifs/smbdirect.c Normal file
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/*
* Copyright (C) 2017, Microsoft Corporation.
*
* Author(s): Long Li <longli@microsoft.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*/
#include "smbdirect.h"
/* SMBD version number */
#define SMBD_V1 0x0100
/* Port numbers for SMBD transport */
#define SMB_PORT 445
#define SMBD_PORT 5445
/* Address lookup and resolve timeout in ms */
#define RDMA_RESOLVE_TIMEOUT 5000
/* SMBD negotiation timeout in seconds */
#define SMBD_NEGOTIATE_TIMEOUT 120
/* SMBD minimum receive size and fragmented sized defined in [MS-SMBD] */
#define SMBD_MIN_RECEIVE_SIZE 128
#define SMBD_MIN_FRAGMENTED_SIZE 131072
/*
* Default maximum number of RDMA read/write outstanding on this connection
* This value is possibly decreased during QP creation on hardware limit
*/
#define SMBD_CM_RESPONDER_RESOURCES 32
/* Maximum number of retries on data transfer operations */
#define SMBD_CM_RETRY 6
/* No need to retry on Receiver Not Ready since SMBD manages credits */
#define SMBD_CM_RNR_RETRY 0
/*
* User configurable initial values per SMBD transport connection
* as defined in [MS-SMBD] 3.1.1.1
* Those may change after a SMBD negotiation
*/
/* The local peer's maximum number of credits to grant to the peer */
int smbd_receive_credit_max = 255;
/* The remote peer's credit request of local peer */
int smbd_send_credit_target = 255;
/* The maximum single message size can be sent to remote peer */
int smbd_max_send_size = 1364;
/* The maximum fragmented upper-layer payload receive size supported */
int smbd_max_fragmented_recv_size = 1024 * 1024;
/* The maximum single-message size which can be received */
int smbd_max_receive_size = 8192;
/* The timeout to initiate send of a keepalive message on idle */
int smbd_keep_alive_interval = 120;
/*
* User configurable initial values for RDMA transport
* The actual values used may be lower and are limited to hardware capabilities
*/
/* Default maximum number of SGEs in a RDMA write/read */
int smbd_max_frmr_depth = 2048;
/* If payload is less than this byte, use RDMA send/recv not read/write */
int rdma_readwrite_threshold = 4096;

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/*
* Copyright (C) 2017, Microsoft Corporation.
*
* Author(s): Long Li <longli@microsoft.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*/
#ifndef _SMBDIRECT_H
#define _SMBDIRECT_H
/* Default maximum number of SGEs in a RDMA send/recv */
#define SMBDIRECT_MAX_SGE 16
#endif