linux-imx

/*

 *   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 <linux/module.h>

#include <linux/highmem.h>

#include "smbdirect.h"

#include "cifs_debug.h"

#include "cifsproto.h"

#include "smb2proto.h"

​

static struct smbd_response *get_empty_queue_buffer(

        struct smbd_connection *info);

static struct smbd_response *get_receive_buffer(

        struct smbd_connection *info);

static void put_receive_buffer(

        struct smbd_connection *info,

        struct smbd_response *response);

static int allocate_receive_buffers(struct smbd_connection *info, int num_buf);

static void destroy_receive_buffers(struct smbd_connection *info);

​

static void put_empty_packet(

        struct smbd_connection *info, struct smbd_response *response);

static void enqueue_reassembly(

        struct smbd_connection *info,

        struct smbd_response *response, int data_length);

static struct smbd_response *_get_first_reassembly(

        struct smbd_connection *info);

​

static int smbd_post_recv(

        struct smbd_connection *info,

        struct smbd_response *response);

​

static int smbd_post_send_empty(struct smbd_connection *info);

static int smbd_post_send_data(

        struct smbd_connection *info,

        struct kvec *iov, int n_vec, int remaining_data_length);

static int smbd_post_send_page(struct smbd_connection *info,

        struct page *page, unsigned long offset,

        size_t size, int remaining_data_length);

​

static void destroy_mr_list(struct smbd_connection *info);

static int allocate_mr_list(struct smbd_connection *info);

​

/* 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 */