LXR linux/drivers/target/iscsi/iscsi_target

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*******************************************************************************
   3 * This file contains the iSCSI Virtual Device and Disk Transport
   4 * agnostic related functions.
   5 *
   6 * (c) Copyright 2007-2013 Datera, Inc.
   7 *
   8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9 *
  10 ******************************************************************************/
  11
  12#include <target/target_core_base.h>
  13#include <target/target_core_fabric.h>
  14
  15#include <target/iscsi/iscsi_target_core.h>
  16#include "iscsi_target_device.h"
  17#include "iscsi_target_tpg.h"
  18#include "iscsi_target_util.h"
  19
  20void iscsit_determine_maxcmdsn(struct iscsi_session *sess)
  21{
  22        struct se_node_acl *se_nacl;
  23
  24        /*
  25         * This is a discovery session, the single queue slot was already
  26         * assigned in iscsi_login_zero_tsih().  Since only Logout and
  27         * Text Opcodes are allowed during discovery we do not have to worry
  28         * about the HBA's queue depth here.
  29         */
  30        if (sess->sess_ops->SessionType)
  31                return;
  32
  33        se_nacl = sess->se_sess->se_node_acl;
  34
  35        /*
  36         * This is a normal session, set the Session's CmdSN window to the
  37         * struct se_node_acl->queue_depth.  The value in struct se_node_acl->queue_depth
  38         * has already been validated as a legal value in
  39         * core_set_queue_depth_for_node().
  40         */
  41        sess->cmdsn_window = se_nacl->queue_depth;
  42        atomic_add(se_nacl->queue_depth - 1, &sess->max_cmd_sn);
  43}
  44
  45void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess)
  46{
  47        u32 max_cmd_sn;
  48
  49        if (cmd->immediate_cmd || cmd->maxcmdsn_inc)
  50                return;
  51
  52        cmd->maxcmdsn_inc = 1;
  53
  54        max_cmd_sn = atomic_inc_return(&sess->max_cmd_sn);
  55        pr_debug("Updated MaxCmdSN to 0x%08x\n", max_cmd_sn);
  56}
  57EXPORT_SYMBOL(iscsit_increment_maxcmdsn);
  58