drivers/target/iscsi/iscsi_target_device.c

   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
  20 void 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
  45 void 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 }
  57 EXPORT_SYMBOL(iscsit_increment_maxcmdsn);