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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/Documentation/target
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/Documentation/target')
-rwxr-xr-xkernel/Documentation/target/tcm_mod_builder.py968
-rw-r--r--kernel/Documentation/target/tcm_mod_builder.txt145
-rw-r--r--kernel/Documentation/target/tcmu-design.txt372
3 files changed, 1485 insertions, 0 deletions
diff --git a/kernel/Documentation/target/tcm_mod_builder.py b/kernel/Documentation/target/tcm_mod_builder.py
new file mode 100755
index 000000000..2ba71cea0
--- /dev/null
+++ b/kernel/Documentation/target/tcm_mod_builder.py
@@ -0,0 +1,968 @@
+#!/usr/bin/python
+# The TCM v4 multi-protocol fabric module generation script for drivers/target/$NEW_MOD
+#
+# Copyright (c) 2010 Rising Tide Systems
+# Copyright (c) 2010 Linux-iSCSI.org
+#
+# Author: nab@kernel.org
+#
+import os, sys
+import subprocess as sub
+import string
+import re
+import optparse
+
+tcm_dir = ""
+
+fabric_ops = []
+fabric_mod_dir = ""
+fabric_mod_port = ""
+fabric_mod_init_port = ""
+
+def tcm_mod_err(msg):
+ print msg
+ sys.exit(1)
+
+def tcm_mod_create_module_subdir(fabric_mod_dir_var):
+
+ if os.path.isdir(fabric_mod_dir_var) == True:
+ return 1
+
+ print "Creating fabric_mod_dir: " + fabric_mod_dir_var
+ ret = os.mkdir(fabric_mod_dir_var)
+ if ret:
+ tcm_mod_err("Unable to mkdir " + fabric_mod_dir_var)
+
+ return
+
+def tcm_mod_build_FC_include(fabric_mod_dir_var, fabric_mod_name):
+ global fabric_mod_port
+ global fabric_mod_init_port
+ buf = ""
+
+ f = fabric_mod_dir_var + "/" + fabric_mod_name + "_base.h"
+ print "Writing file: " + f
+
+ p = open(f, 'w');
+ if not p:
+ tcm_mod_err("Unable to open file: " + f)
+
+ buf = "#define " + fabric_mod_name.upper() + "_VERSION \"v0.1\"\n"
+ buf += "#define " + fabric_mod_name.upper() + "_NAMELEN 32\n"
+ buf += "\n"
+ buf += "struct " + fabric_mod_name + "_nacl {\n"
+ buf += " /* Binary World Wide unique Port Name for FC Initiator Nport */\n"
+ buf += " u64 nport_wwpn;\n"
+ buf += " /* ASCII formatted WWPN for FC Initiator Nport */\n"
+ buf += " char nport_name[" + fabric_mod_name.upper() + "_NAMELEN];\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_nodeacl() */\n"
+ buf += " struct se_node_acl se_node_acl;\n"
+ buf += "};\n"
+ buf += "\n"
+ buf += "struct " + fabric_mod_name + "_tpg {\n"
+ buf += " /* FC lport target portal group tag for TCM */\n"
+ buf += " u16 lport_tpgt;\n"
+ buf += " /* Pointer back to " + fabric_mod_name + "_lport */\n"
+ buf += " struct " + fabric_mod_name + "_lport *lport;\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_tpg() */\n"
+ buf += " struct se_portal_group se_tpg;\n"
+ buf += "};\n"
+ buf += "\n"
+ buf += "struct " + fabric_mod_name + "_lport {\n"
+ buf += " /* SCSI protocol the lport is providing */\n"
+ buf += " u8 lport_proto_id;\n"
+ buf += " /* Binary World Wide unique Port Name for FC Target Lport */\n"
+ buf += " u64 lport_wwpn;\n"
+ buf += " /* ASCII formatted WWPN for FC Target Lport */\n"
+ buf += " char lport_name[" + fabric_mod_name.upper() + "_NAMELEN];\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_lport() */\n"
+ buf += " struct se_wwn lport_wwn;\n"
+ buf += "};\n"
+
+ ret = p.write(buf)
+ if ret:
+ tcm_mod_err("Unable to write f: " + f)
+
+ p.close()
+
+ fabric_mod_port = "lport"
+ fabric_mod_init_port = "nport"
+
+ return
+
+def tcm_mod_build_SAS_include(fabric_mod_dir_var, fabric_mod_name):
+ global fabric_mod_port
+ global fabric_mod_init_port
+ buf = ""
+
+ f = fabric_mod_dir_var + "/" + fabric_mod_name + "_base.h"
+ print "Writing file: " + f
+
+ p = open(f, 'w');
+ if not p:
+ tcm_mod_err("Unable to open file: " + f)
+
+ buf = "#define " + fabric_mod_name.upper() + "_VERSION \"v0.1\"\n"
+ buf += "#define " + fabric_mod_name.upper() + "_NAMELEN 32\n"
+ buf += "\n"
+ buf += "struct " + fabric_mod_name + "_nacl {\n"
+ buf += " /* Binary World Wide unique Port Name for SAS Initiator port */\n"
+ buf += " u64 iport_wwpn;\n"
+ buf += " /* ASCII formatted WWPN for Sas Initiator port */\n"
+ buf += " char iport_name[" + fabric_mod_name.upper() + "_NAMELEN];\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_nodeacl() */\n"
+ buf += " struct se_node_acl se_node_acl;\n"
+ buf += "};\n\n"
+ buf += "struct " + fabric_mod_name + "_tpg {\n"
+ buf += " /* SAS port target portal group tag for TCM */\n"
+ buf += " u16 tport_tpgt;\n"
+ buf += " /* Pointer back to " + fabric_mod_name + "_tport */\n"
+ buf += " struct " + fabric_mod_name + "_tport *tport;\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_tpg() */\n"
+ buf += " struct se_portal_group se_tpg;\n"
+ buf += "};\n\n"
+ buf += "struct " + fabric_mod_name + "_tport {\n"
+ buf += " /* SCSI protocol the tport is providing */\n"
+ buf += " u8 tport_proto_id;\n"
+ buf += " /* Binary World Wide unique Port Name for SAS Target port */\n"
+ buf += " u64 tport_wwpn;\n"
+ buf += " /* ASCII formatted WWPN for SAS Target port */\n"
+ buf += " char tport_name[" + fabric_mod_name.upper() + "_NAMELEN];\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_tport() */\n"
+ buf += " struct se_wwn tport_wwn;\n"
+ buf += "};\n"
+
+ ret = p.write(buf)
+ if ret:
+ tcm_mod_err("Unable to write f: " + f)
+
+ p.close()
+
+ fabric_mod_port = "tport"
+ fabric_mod_init_port = "iport"
+
+ return
+
+def tcm_mod_build_iSCSI_include(fabric_mod_dir_var, fabric_mod_name):
+ global fabric_mod_port
+ global fabric_mod_init_port
+ buf = ""
+
+ f = fabric_mod_dir_var + "/" + fabric_mod_name + "_base.h"
+ print "Writing file: " + f
+
+ p = open(f, 'w');
+ if not p:
+ tcm_mod_err("Unable to open file: " + f)
+
+ buf = "#define " + fabric_mod_name.upper() + "_VERSION \"v0.1\"\n"
+ buf += "#define " + fabric_mod_name.upper() + "_NAMELEN 32\n"
+ buf += "\n"
+ buf += "struct " + fabric_mod_name + "_nacl {\n"
+ buf += " /* ASCII formatted InitiatorName */\n"
+ buf += " char iport_name[" + fabric_mod_name.upper() + "_NAMELEN];\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_nodeacl() */\n"
+ buf += " struct se_node_acl se_node_acl;\n"
+ buf += "};\n\n"
+ buf += "struct " + fabric_mod_name + "_tpg {\n"
+ buf += " /* iSCSI target portal group tag for TCM */\n"
+ buf += " u16 tport_tpgt;\n"
+ buf += " /* Pointer back to " + fabric_mod_name + "_tport */\n"
+ buf += " struct " + fabric_mod_name + "_tport *tport;\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_tpg() */\n"
+ buf += " struct se_portal_group se_tpg;\n"
+ buf += "};\n\n"
+ buf += "struct " + fabric_mod_name + "_tport {\n"
+ buf += " /* SCSI protocol the tport is providing */\n"
+ buf += " u8 tport_proto_id;\n"
+ buf += " /* ASCII formatted TargetName for IQN */\n"
+ buf += " char tport_name[" + fabric_mod_name.upper() + "_NAMELEN];\n"
+ buf += " /* Returned by " + fabric_mod_name + "_make_tport() */\n"
+ buf += " struct se_wwn tport_wwn;\n"
+ buf += "};\n"
+
+ ret = p.write(buf)
+ if ret:
+ tcm_mod_err("Unable to write f: " + f)
+
+ p.close()
+
+ fabric_mod_port = "tport"
+ fabric_mod_init_port = "iport"
+
+ return
+
+def tcm_mod_build_base_includes(proto_ident, fabric_mod_dir_val, fabric_mod_name):
+
+ if proto_ident == "FC":
+ tcm_mod_build_FC_include(fabric_mod_dir_val, fabric_mod_name)
+ elif proto_ident == "SAS":
+ tcm_mod_build_SAS_include(fabric_mod_dir_val, fabric_mod_name)
+ elif proto_ident == "iSCSI":
+ tcm_mod_build_iSCSI_include(fabric_mod_dir_val, fabric_mod_name)
+ else:
+ print "Unsupported proto_ident: " + proto_ident
+ sys.exit(1)
+
+ return
+
+def tcm_mod_build_configfs(proto_ident, fabric_mod_dir_var, fabric_mod_name):
+ buf = ""
+
+ f = fabric_mod_dir_var + "/" + fabric_mod_name + "_configfs.c"
+ print "Writing file: " + f
+
+ p = open(f, 'w');
+ if not p:
+ tcm_mod_err("Unable to open file: " + f)
+
+ buf = "#include <linux/module.h>\n"
+ buf += "#include <linux/moduleparam.h>\n"
+ buf += "#include <linux/version.h>\n"
+ buf += "#include <generated/utsrelease.h>\n"
+ buf += "#include <linux/utsname.h>\n"
+ buf += "#include <linux/init.h>\n"
+ buf += "#include <linux/slab.h>\n"
+ buf += "#include <linux/kthread.h>\n"
+ buf += "#include <linux/types.h>\n"
+ buf += "#include <linux/string.h>\n"
+ buf += "#include <linux/configfs.h>\n"
+ buf += "#include <linux/ctype.h>\n"
+ buf += "#include <asm/unaligned.h>\n\n"
+ buf += "#include <target/target_core_base.h>\n"
+ buf += "#include <target/target_core_fabric.h>\n"
+ buf += "#include <target/target_core_fabric_configfs.h>\n"
+ buf += "#include <target/target_core_configfs.h>\n"
+ buf += "#include <target/configfs_macros.h>\n\n"
+ buf += "#include \"" + fabric_mod_name + "_base.h\"\n"
+ buf += "#include \"" + fabric_mod_name + "_fabric.h\"\n\n"
+
+ buf += "static const struct target_core_fabric_ops " + fabric_mod_name + "_ops;\n\n"
+
+ buf += "static struct se_node_acl *" + fabric_mod_name + "_make_nodeacl(\n"
+ buf += " struct se_portal_group *se_tpg,\n"
+ buf += " struct config_group *group,\n"
+ buf += " const char *name)\n"
+ buf += "{\n"
+ buf += " struct se_node_acl *se_nacl, *se_nacl_new;\n"
+ buf += " struct " + fabric_mod_name + "_nacl *nacl;\n"
+
+ if proto_ident == "FC" or proto_ident == "SAS":
+ buf += " u64 wwpn = 0;\n"
+
+ buf += " u32 nexus_depth;\n\n"
+ buf += " /* " + fabric_mod_name + "_parse_wwn(name, &wwpn, 1) < 0)\n"
+ buf += " return ERR_PTR(-EINVAL); */\n"
+ buf += " se_nacl_new = " + fabric_mod_name + "_alloc_fabric_acl(se_tpg);\n"
+ buf += " if (!se_nacl_new)\n"
+ buf += " return ERR_PTR(-ENOMEM);\n"
+ buf += "//#warning FIXME: Hardcoded nexus depth in " + fabric_mod_name + "_make_nodeacl()\n"
+ buf += " nexus_depth = 1;\n"
+ buf += " /*\n"
+ buf += " * se_nacl_new may be released by core_tpg_add_initiator_node_acl()\n"
+ buf += " * when converting a NodeACL from demo mode -> explict\n"
+ buf += " */\n"
+ buf += " se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,\n"
+ buf += " name, nexus_depth);\n"
+ buf += " if (IS_ERR(se_nacl)) {\n"
+ buf += " " + fabric_mod_name + "_release_fabric_acl(se_tpg, se_nacl_new);\n"
+ buf += " return se_nacl;\n"
+ buf += " }\n"
+ buf += " /*\n"
+ buf += " * Locate our struct " + fabric_mod_name + "_nacl and set the FC Nport WWPN\n"
+ buf += " */\n"
+ buf += " nacl = container_of(se_nacl, struct " + fabric_mod_name + "_nacl, se_node_acl);\n"
+
+ if proto_ident == "FC" or proto_ident == "SAS":
+ buf += " nacl->" + fabric_mod_init_port + "_wwpn = wwpn;\n"
+
+ buf += " /* " + fabric_mod_name + "_format_wwn(&nacl->" + fabric_mod_init_port + "_name[0], " + fabric_mod_name.upper() + "_NAMELEN, wwpn); */\n\n"
+ buf += " return se_nacl;\n"
+ buf += "}\n\n"
+ buf += "static void " + fabric_mod_name + "_drop_nodeacl(struct se_node_acl *se_acl)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_nacl *nacl = container_of(se_acl,\n"
+ buf += " struct " + fabric_mod_name + "_nacl, se_node_acl);\n"
+ buf += " core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);\n"
+ buf += " kfree(nacl);\n"
+ buf += "}\n\n"
+
+ buf += "static struct se_portal_group *" + fabric_mod_name + "_make_tpg(\n"
+ buf += " struct se_wwn *wwn,\n"
+ buf += " struct config_group *group,\n"
+ buf += " const char *name)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + "*" + fabric_mod_port + " = container_of(wwn,\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + ", " + fabric_mod_port + "_wwn);\n\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg;\n"
+ buf += " unsigned long tpgt;\n"
+ buf += " int ret;\n\n"
+ buf += " if (strstr(name, \"tpgt_\") != name)\n"
+ buf += " return ERR_PTR(-EINVAL);\n"
+ buf += " if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)\n"
+ buf += " return ERR_PTR(-EINVAL);\n\n"
+ buf += " tpg = kzalloc(sizeof(struct " + fabric_mod_name + "_tpg), GFP_KERNEL);\n"
+ buf += " if (!tpg) {\n"
+ buf += " printk(KERN_ERR \"Unable to allocate struct " + fabric_mod_name + "_tpg\");\n"
+ buf += " return ERR_PTR(-ENOMEM);\n"
+ buf += " }\n"
+ buf += " tpg->" + fabric_mod_port + " = " + fabric_mod_port + ";\n"
+ buf += " tpg->" + fabric_mod_port + "_tpgt = tpgt;\n\n"
+ buf += " ret = core_tpg_register(&" + fabric_mod_name + "_ops, wwn,\n"
+ buf += " &tpg->se_tpg, tpg,\n"
+ buf += " TRANSPORT_TPG_TYPE_NORMAL);\n"
+ buf += " if (ret < 0) {\n"
+ buf += " kfree(tpg);\n"
+ buf += " return NULL;\n"
+ buf += " }\n"
+ buf += " return &tpg->se_tpg;\n"
+ buf += "}\n\n"
+ buf += "static void " + fabric_mod_name + "_drop_tpg(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg = container_of(se_tpg,\n"
+ buf += " struct " + fabric_mod_name + "_tpg, se_tpg);\n\n"
+ buf += " core_tpg_deregister(se_tpg);\n"
+ buf += " kfree(tpg);\n"
+ buf += "}\n\n"
+
+ buf += "static struct se_wwn *" + fabric_mod_name + "_make_" + fabric_mod_port + "(\n"
+ buf += " struct target_fabric_configfs *tf,\n"
+ buf += " struct config_group *group,\n"
+ buf += " const char *name)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + " *" + fabric_mod_port + ";\n"
+
+ if proto_ident == "FC" or proto_ident == "SAS":
+ buf += " u64 wwpn = 0;\n\n"
+
+ buf += " /* if (" + fabric_mod_name + "_parse_wwn(name, &wwpn, 1) < 0)\n"
+ buf += " return ERR_PTR(-EINVAL); */\n\n"
+ buf += " " + fabric_mod_port + " = kzalloc(sizeof(struct " + fabric_mod_name + "_" + fabric_mod_port + "), GFP_KERNEL);\n"
+ buf += " if (!" + fabric_mod_port + ") {\n"
+ buf += " printk(KERN_ERR \"Unable to allocate struct " + fabric_mod_name + "_" + fabric_mod_port + "\");\n"
+ buf += " return ERR_PTR(-ENOMEM);\n"
+ buf += " }\n"
+
+ if proto_ident == "FC" or proto_ident == "SAS":
+ buf += " " + fabric_mod_port + "->" + fabric_mod_port + "_wwpn = wwpn;\n"
+
+ buf += " /* " + fabric_mod_name + "_format_wwn(&" + fabric_mod_port + "->" + fabric_mod_port + "_name[0], " + fabric_mod_name.upper() + "_NAMELEN, wwpn); */\n\n"
+ buf += " return &" + fabric_mod_port + "->" + fabric_mod_port + "_wwn;\n"
+ buf += "}\n\n"
+ buf += "static void " + fabric_mod_name + "_drop_" + fabric_mod_port + "(struct se_wwn *wwn)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + " *" + fabric_mod_port + " = container_of(wwn,\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + ", " + fabric_mod_port + "_wwn);\n"
+ buf += " kfree(" + fabric_mod_port + ");\n"
+ buf += "}\n\n"
+ buf += "static ssize_t " + fabric_mod_name + "_wwn_show_attr_version(\n"
+ buf += " struct target_fabric_configfs *tf,\n"
+ buf += " char *page)\n"
+ buf += "{\n"
+ buf += " return sprintf(page, \"" + fabric_mod_name.upper() + " fabric module %s on %s/%s\"\n"
+ buf += " \"on \"UTS_RELEASE\"\\n\", " + fabric_mod_name.upper() + "_VERSION, utsname()->sysname,\n"
+ buf += " utsname()->machine);\n"
+ buf += "}\n\n"
+ buf += "TF_WWN_ATTR_RO(" + fabric_mod_name + ", version);\n\n"
+ buf += "static struct configfs_attribute *" + fabric_mod_name + "_wwn_attrs[] = {\n"
+ buf += " &" + fabric_mod_name + "_wwn_version.attr,\n"
+ buf += " NULL,\n"
+ buf += "};\n\n"
+
+ buf += "static const struct target_core_fabric_ops " + fabric_mod_name + "_ops = {\n"
+ buf += " .module = THIS_MODULE,\n"
+ buf += " .name = " + fabric_mod_name + ",\n"
+ buf += " .get_fabric_proto_ident = " + fabric_mod_name + "_get_fabric_proto_ident,\n"
+ buf += " .get_fabric_name = " + fabric_mod_name + "_get_fabric_name,\n"
+ buf += " .get_fabric_proto_ident = " + fabric_mod_name + "_get_fabric_proto_ident,\n"
+ buf += " .tpg_get_wwn = " + fabric_mod_name + "_get_fabric_wwn,\n"
+ buf += " .tpg_get_tag = " + fabric_mod_name + "_get_tag,\n"
+ buf += " .tpg_get_default_depth = " + fabric_mod_name + "_get_default_depth,\n"
+ buf += " .tpg_get_pr_transport_id = " + fabric_mod_name + "_get_pr_transport_id,\n"
+ buf += " .tpg_get_pr_transport_id_len = " + fabric_mod_name + "_get_pr_transport_id_len,\n"
+ buf += " .tpg_parse_pr_out_transport_id = " + fabric_mod_name + "_parse_pr_out_transport_id,\n"
+ buf += " .tpg_check_demo_mode = " + fabric_mod_name + "_check_false,\n"
+ buf += " .tpg_check_demo_mode_cache = " + fabric_mod_name + "_check_true,\n"
+ buf += " .tpg_check_demo_mode_write_protect = " + fabric_mod_name + "_check_true,\n"
+ buf += " .tpg_check_prod_mode_write_protect = " + fabric_mod_name + "_check_false,\n"
+ buf += " .tpg_alloc_fabric_acl = " + fabric_mod_name + "_alloc_fabric_acl,\n"
+ buf += " .tpg_release_fabric_acl = " + fabric_mod_name + "_release_fabric_acl,\n"
+ buf += " .tpg_get_inst_index = " + fabric_mod_name + "_tpg_get_inst_index,\n"
+ buf += " .release_cmd = " + fabric_mod_name + "_release_cmd,\n"
+ buf += " .shutdown_session = " + fabric_mod_name + "_shutdown_session,\n"
+ buf += " .close_session = " + fabric_mod_name + "_close_session,\n"
+ buf += " .sess_get_index = " + fabric_mod_name + "_sess_get_index,\n"
+ buf += " .sess_get_initiator_sid = NULL,\n"
+ buf += " .write_pending = " + fabric_mod_name + "_write_pending,\n"
+ buf += " .write_pending_status = " + fabric_mod_name + "_write_pending_status,\n"
+ buf += " .set_default_node_attributes = " + fabric_mod_name + "_set_default_node_attrs,\n"
+ buf += " .get_task_tag = " + fabric_mod_name + "_get_task_tag,\n"
+ buf += " .get_cmd_state = " + fabric_mod_name + "_get_cmd_state,\n"
+ buf += " .queue_data_in = " + fabric_mod_name + "_queue_data_in,\n"
+ buf += " .queue_status = " + fabric_mod_name + "_queue_status,\n"
+ buf += " .queue_tm_rsp = " + fabric_mod_name + "_queue_tm_rsp,\n"
+ buf += " .aborted_task = " + fabric_mod_name + "_aborted_task,\n"
+ buf += " /*\n"
+ buf += " * Setup function pointers for generic logic in target_core_fabric_configfs.c\n"
+ buf += " */\n"
+ buf += " .fabric_make_wwn = " + fabric_mod_name + "_make_" + fabric_mod_port + ",\n"
+ buf += " .fabric_drop_wwn = " + fabric_mod_name + "_drop_" + fabric_mod_port + ",\n"
+ buf += " .fabric_make_tpg = " + fabric_mod_name + "_make_tpg,\n"
+ buf += " .fabric_drop_tpg = " + fabric_mod_name + "_drop_tpg,\n"
+ buf += " .fabric_post_link = NULL,\n"
+ buf += " .fabric_pre_unlink = NULL,\n"
+ buf += " .fabric_make_np = NULL,\n"
+ buf += " .fabric_drop_np = NULL,\n"
+ buf += " .fabric_make_nodeacl = " + fabric_mod_name + "_make_nodeacl,\n"
+ buf += " .fabric_drop_nodeacl = " + fabric_mod_name + "_drop_nodeacl,\n"
+ buf += "\n"
+ buf += " .tfc_wwn_attrs = " + fabric_mod_name + "_wwn_attrs;\n"
+ buf += "};\n\n"
+
+ buf += "static int __init " + fabric_mod_name + "_init(void)\n"
+ buf += "{\n"
+ buf += " return target_register_template(" + fabric_mod_name + "_ops);\n"
+ buf += "};\n\n"
+
+ buf += "static void __exit " + fabric_mod_name + "_exit(void)\n"
+ buf += "{\n"
+ buf += " target_unregister_template(" + fabric_mod_name + "_ops);\n"
+ buf += "};\n\n"
+
+ buf += "MODULE_DESCRIPTION(\"" + fabric_mod_name.upper() + " series fabric driver\");\n"
+ buf += "MODULE_LICENSE(\"GPL\");\n"
+ buf += "module_init(" + fabric_mod_name + "_init);\n"
+ buf += "module_exit(" + fabric_mod_name + "_exit);\n"
+
+ ret = p.write(buf)
+ if ret:
+ tcm_mod_err("Unable to write f: " + f)
+
+ p.close()
+
+ return
+
+def tcm_mod_scan_fabric_ops(tcm_dir):
+
+ fabric_ops_api = tcm_dir + "include/target/target_core_fabric.h"
+
+ print "Using tcm_mod_scan_fabric_ops: " + fabric_ops_api
+ process_fo = 0;
+
+ p = open(fabric_ops_api, 'r')
+
+ line = p.readline()
+ while line:
+ if process_fo == 0 and re.search('struct target_core_fabric_ops {', line):
+ line = p.readline()
+ continue
+
+ if process_fo == 0:
+ process_fo = 1;
+ line = p.readline()
+ # Search for function pointer
+ if not re.search('\(\*', line):
+ continue
+
+ fabric_ops.append(line.rstrip())
+ continue
+
+ line = p.readline()
+ # Search for function pointer
+ if not re.search('\(\*', line):
+ continue
+
+ fabric_ops.append(line.rstrip())
+
+ p.close()
+ return
+
+def tcm_mod_dump_fabric_ops(proto_ident, fabric_mod_dir_var, fabric_mod_name):
+ buf = ""
+ bufi = ""
+
+ f = fabric_mod_dir_var + "/" + fabric_mod_name + "_fabric.c"
+ print "Writing file: " + f
+
+ p = open(f, 'w')
+ if not p:
+ tcm_mod_err("Unable to open file: " + f)
+
+ fi = fabric_mod_dir_var + "/" + fabric_mod_name + "_fabric.h"
+ print "Writing file: " + fi
+
+ pi = open(fi, 'w')
+ if not pi:
+ tcm_mod_err("Unable to open file: " + fi)
+
+ buf = "#include <linux/slab.h>\n"
+ buf += "#include <linux/kthread.h>\n"
+ buf += "#include <linux/types.h>\n"
+ buf += "#include <linux/list.h>\n"
+ buf += "#include <linux/types.h>\n"
+ buf += "#include <linux/string.h>\n"
+ buf += "#include <linux/ctype.h>\n"
+ buf += "#include <asm/unaligned.h>\n"
+ buf += "#include <scsi/scsi.h>\n"
+ buf += "#include <scsi/scsi_host.h>\n"
+ buf += "#include <scsi/scsi_device.h>\n"
+ buf += "#include <scsi/scsi_cmnd.h>\n"
+ buf += "#include <scsi/libfc.h>\n\n"
+ buf += "#include <target/target_core_base.h>\n"
+ buf += "#include <target/target_core_fabric.h>\n"
+ buf += "#include <target/target_core_configfs.h>\n\n"
+ buf += "#include \"" + fabric_mod_name + "_base.h\"\n"
+ buf += "#include \"" + fabric_mod_name + "_fabric.h\"\n\n"
+
+ buf += "int " + fabric_mod_name + "_check_true(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " return 1;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_check_true(struct se_portal_group *);\n"
+
+ buf += "int " + fabric_mod_name + "_check_false(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_check_false(struct se_portal_group *);\n"
+
+ total_fabric_ops = len(fabric_ops)
+ i = 0
+
+ while i < total_fabric_ops:
+ fo = fabric_ops[i]
+ i += 1
+# print "fabric_ops: " + fo
+
+ if re.search('get_fabric_name', fo):
+ buf += "char *" + fabric_mod_name + "_get_fabric_name(void)\n"
+ buf += "{\n"
+ buf += " return \"" + fabric_mod_name + "\";\n"
+ buf += "}\n\n"
+ bufi += "char *" + fabric_mod_name + "_get_fabric_name(void);\n"
+ continue
+
+ if re.search('get_fabric_proto_ident', fo):
+ buf += "u8 " + fabric_mod_name + "_get_fabric_proto_ident(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg = container_of(se_tpg,\n"
+ buf += " struct " + fabric_mod_name + "_tpg, se_tpg);\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + " *" + fabric_mod_port + " = tpg->" + fabric_mod_port + ";\n"
+ buf += " u8 proto_id;\n\n"
+ buf += " switch (" + fabric_mod_port + "->" + fabric_mod_port + "_proto_id) {\n"
+ if proto_ident == "FC":
+ buf += " case SCSI_PROTOCOL_FCP:\n"
+ buf += " default:\n"
+ buf += " proto_id = fc_get_fabric_proto_ident(se_tpg);\n"
+ buf += " break;\n"
+ elif proto_ident == "SAS":
+ buf += " case SCSI_PROTOCOL_SAS:\n"
+ buf += " default:\n"
+ buf += " proto_id = sas_get_fabric_proto_ident(se_tpg);\n"
+ buf += " break;\n"
+ elif proto_ident == "iSCSI":
+ buf += " case SCSI_PROTOCOL_ISCSI:\n"
+ buf += " default:\n"
+ buf += " proto_id = iscsi_get_fabric_proto_ident(se_tpg);\n"
+ buf += " break;\n"
+
+ buf += " }\n\n"
+ buf += " return proto_id;\n"
+ buf += "}\n\n"
+ bufi += "u8 " + fabric_mod_name + "_get_fabric_proto_ident(struct se_portal_group *);\n"
+
+ if re.search('get_wwn', fo):
+ buf += "char *" + fabric_mod_name + "_get_fabric_wwn(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg = container_of(se_tpg,\n"
+ buf += " struct " + fabric_mod_name + "_tpg, se_tpg);\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + " *" + fabric_mod_port + " = tpg->" + fabric_mod_port + ";\n\n"
+ buf += " return &" + fabric_mod_port + "->" + fabric_mod_port + "_name[0];\n"
+ buf += "}\n\n"
+ bufi += "char *" + fabric_mod_name + "_get_fabric_wwn(struct se_portal_group *);\n"
+
+ if re.search('get_tag', fo):
+ buf += "u16 " + fabric_mod_name + "_get_tag(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg = container_of(se_tpg,\n"
+ buf += " struct " + fabric_mod_name + "_tpg, se_tpg);\n"
+ buf += " return tpg->" + fabric_mod_port + "_tpgt;\n"
+ buf += "}\n\n"
+ bufi += "u16 " + fabric_mod_name + "_get_tag(struct se_portal_group *);\n"
+
+ if re.search('get_default_depth', fo):
+ buf += "u32 " + fabric_mod_name + "_get_default_depth(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " return 1;\n"
+ buf += "}\n\n"
+ bufi += "u32 " + fabric_mod_name + "_get_default_depth(struct se_portal_group *);\n"
+
+ if re.search('get_pr_transport_id\)\(', fo):
+ buf += "u32 " + fabric_mod_name + "_get_pr_transport_id(\n"
+ buf += " struct se_portal_group *se_tpg,\n"
+ buf += " struct se_node_acl *se_nacl,\n"
+ buf += " struct t10_pr_registration *pr_reg,\n"
+ buf += " int *format_code,\n"
+ buf += " unsigned char *buf)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg = container_of(se_tpg,\n"
+ buf += " struct " + fabric_mod_name + "_tpg, se_tpg);\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + " *" + fabric_mod_port + " = tpg->" + fabric_mod_port + ";\n"
+ buf += " int ret = 0;\n\n"
+ buf += " switch (" + fabric_mod_port + "->" + fabric_mod_port + "_proto_id) {\n"
+ if proto_ident == "FC":
+ buf += " case SCSI_PROTOCOL_FCP:\n"
+ buf += " default:\n"
+ buf += " ret = fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,\n"
+ buf += " format_code, buf);\n"
+ buf += " break;\n"
+ elif proto_ident == "SAS":
+ buf += " case SCSI_PROTOCOL_SAS:\n"
+ buf += " default:\n"
+ buf += " ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,\n"
+ buf += " format_code, buf);\n"
+ buf += " break;\n"
+ elif proto_ident == "iSCSI":
+ buf += " case SCSI_PROTOCOL_ISCSI:\n"
+ buf += " default:\n"
+ buf += " ret = iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,\n"
+ buf += " format_code, buf);\n"
+ buf += " break;\n"
+
+ buf += " }\n\n"
+ buf += " return ret;\n"
+ buf += "}\n\n"
+ bufi += "u32 " + fabric_mod_name + "_get_pr_transport_id(struct se_portal_group *,\n"
+ bufi += " struct se_node_acl *, struct t10_pr_registration *,\n"
+ bufi += " int *, unsigned char *);\n"
+
+ if re.search('get_pr_transport_id_len\)\(', fo):
+ buf += "u32 " + fabric_mod_name + "_get_pr_transport_id_len(\n"
+ buf += " struct se_portal_group *se_tpg,\n"
+ buf += " struct se_node_acl *se_nacl,\n"
+ buf += " struct t10_pr_registration *pr_reg,\n"
+ buf += " int *format_code)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg = container_of(se_tpg,\n"
+ buf += " struct " + fabric_mod_name + "_tpg, se_tpg);\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + " *" + fabric_mod_port + " = tpg->" + fabric_mod_port + ";\n"
+ buf += " int ret = 0;\n\n"
+ buf += " switch (" + fabric_mod_port + "->" + fabric_mod_port + "_proto_id) {\n"
+ if proto_ident == "FC":
+ buf += " case SCSI_PROTOCOL_FCP:\n"
+ buf += " default:\n"
+ buf += " ret = fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,\n"
+ buf += " format_code);\n"
+ buf += " break;\n"
+ elif proto_ident == "SAS":
+ buf += " case SCSI_PROTOCOL_SAS:\n"
+ buf += " default:\n"
+ buf += " ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,\n"
+ buf += " format_code);\n"
+ buf += " break;\n"
+ elif proto_ident == "iSCSI":
+ buf += " case SCSI_PROTOCOL_ISCSI:\n"
+ buf += " default:\n"
+ buf += " ret = iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,\n"
+ buf += " format_code);\n"
+ buf += " break;\n"
+
+
+ buf += " }\n\n"
+ buf += " return ret;\n"
+ buf += "}\n\n"
+ bufi += "u32 " + fabric_mod_name + "_get_pr_transport_id_len(struct se_portal_group *,\n"
+ bufi += " struct se_node_acl *, struct t10_pr_registration *,\n"
+ bufi += " int *);\n"
+
+ if re.search('parse_pr_out_transport_id\)\(', fo):
+ buf += "char *" + fabric_mod_name + "_parse_pr_out_transport_id(\n"
+ buf += " struct se_portal_group *se_tpg,\n"
+ buf += " const char *buf,\n"
+ buf += " u32 *out_tid_len,\n"
+ buf += " char **port_nexus_ptr)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_tpg *tpg = container_of(se_tpg,\n"
+ buf += " struct " + fabric_mod_name + "_tpg, se_tpg);\n"
+ buf += " struct " + fabric_mod_name + "_" + fabric_mod_port + " *" + fabric_mod_port + " = tpg->" + fabric_mod_port + ";\n"
+ buf += " char *tid = NULL;\n\n"
+ buf += " switch (" + fabric_mod_port + "->" + fabric_mod_port + "_proto_id) {\n"
+ if proto_ident == "FC":
+ buf += " case SCSI_PROTOCOL_FCP:\n"
+ buf += " default:\n"
+ buf += " tid = fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,\n"
+ buf += " port_nexus_ptr);\n"
+ elif proto_ident == "SAS":
+ buf += " case SCSI_PROTOCOL_SAS:\n"
+ buf += " default:\n"
+ buf += " tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,\n"
+ buf += " port_nexus_ptr);\n"
+ elif proto_ident == "iSCSI":
+ buf += " case SCSI_PROTOCOL_ISCSI:\n"
+ buf += " default:\n"
+ buf += " tid = iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,\n"
+ buf += " port_nexus_ptr);\n"
+
+ buf += " }\n\n"
+ buf += " return tid;\n"
+ buf += "}\n\n"
+ bufi += "char *" + fabric_mod_name + "_parse_pr_out_transport_id(struct se_portal_group *,\n"
+ bufi += " const char *, u32 *, char **);\n"
+
+ if re.search('alloc_fabric_acl\)\(', fo):
+ buf += "struct se_node_acl *" + fabric_mod_name + "_alloc_fabric_acl(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_nacl *nacl;\n\n"
+ buf += " nacl = kzalloc(sizeof(struct " + fabric_mod_name + "_nacl), GFP_KERNEL);\n"
+ buf += " if (!nacl) {\n"
+ buf += " printk(KERN_ERR \"Unable to allocate struct " + fabric_mod_name + "_nacl\\n\");\n"
+ buf += " return NULL;\n"
+ buf += " }\n\n"
+ buf += " return &nacl->se_node_acl;\n"
+ buf += "}\n\n"
+ bufi += "struct se_node_acl *" + fabric_mod_name + "_alloc_fabric_acl(struct se_portal_group *);\n"
+
+ if re.search('release_fabric_acl\)\(', fo):
+ buf += "void " + fabric_mod_name + "_release_fabric_acl(\n"
+ buf += " struct se_portal_group *se_tpg,\n"
+ buf += " struct se_node_acl *se_nacl)\n"
+ buf += "{\n"
+ buf += " struct " + fabric_mod_name + "_nacl *nacl = container_of(se_nacl,\n"
+ buf += " struct " + fabric_mod_name + "_nacl, se_node_acl);\n"
+ buf += " kfree(nacl);\n"
+ buf += "}\n\n"
+ bufi += "void " + fabric_mod_name + "_release_fabric_acl(struct se_portal_group *,\n"
+ bufi += " struct se_node_acl *);\n"
+
+ if re.search('tpg_get_inst_index\)\(', fo):
+ buf += "u32 " + fabric_mod_name + "_tpg_get_inst_index(struct se_portal_group *se_tpg)\n"
+ buf += "{\n"
+ buf += " return 1;\n"
+ buf += "}\n\n"
+ bufi += "u32 " + fabric_mod_name + "_tpg_get_inst_index(struct se_portal_group *);\n"
+
+ if re.search('\*release_cmd\)\(', fo):
+ buf += "void " + fabric_mod_name + "_release_cmd(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return;\n"
+ buf += "}\n\n"
+ bufi += "void " + fabric_mod_name + "_release_cmd(struct se_cmd *);\n"
+
+ if re.search('shutdown_session\)\(', fo):
+ buf += "int " + fabric_mod_name + "_shutdown_session(struct se_session *se_sess)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_shutdown_session(struct se_session *);\n"
+
+ if re.search('close_session\)\(', fo):
+ buf += "void " + fabric_mod_name + "_close_session(struct se_session *se_sess)\n"
+ buf += "{\n"
+ buf += " return;\n"
+ buf += "}\n\n"
+ bufi += "void " + fabric_mod_name + "_close_session(struct se_session *);\n"
+
+ if re.search('sess_get_index\)\(', fo):
+ buf += "u32 " + fabric_mod_name + "_sess_get_index(struct se_session *se_sess)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "u32 " + fabric_mod_name + "_sess_get_index(struct se_session *);\n"
+
+ if re.search('write_pending\)\(', fo):
+ buf += "int " + fabric_mod_name + "_write_pending(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_write_pending(struct se_cmd *);\n"
+
+ if re.search('write_pending_status\)\(', fo):
+ buf += "int " + fabric_mod_name + "_write_pending_status(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_write_pending_status(struct se_cmd *);\n"
+
+ if re.search('set_default_node_attributes\)\(', fo):
+ buf += "void " + fabric_mod_name + "_set_default_node_attrs(struct se_node_acl *nacl)\n"
+ buf += "{\n"
+ buf += " return;\n"
+ buf += "}\n\n"
+ bufi += "void " + fabric_mod_name + "_set_default_node_attrs(struct se_node_acl *);\n"
+
+ if re.search('get_task_tag\)\(', fo):
+ buf += "u32 " + fabric_mod_name + "_get_task_tag(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "u32 " + fabric_mod_name + "_get_task_tag(struct se_cmd *);\n"
+
+ if re.search('get_cmd_state\)\(', fo):
+ buf += "int " + fabric_mod_name + "_get_cmd_state(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_get_cmd_state(struct se_cmd *);\n"
+
+ if re.search('queue_data_in\)\(', fo):
+ buf += "int " + fabric_mod_name + "_queue_data_in(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_queue_data_in(struct se_cmd *);\n"
+
+ if re.search('queue_status\)\(', fo):
+ buf += "int " + fabric_mod_name + "_queue_status(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return 0;\n"
+ buf += "}\n\n"
+ bufi += "int " + fabric_mod_name + "_queue_status(struct se_cmd *);\n"
+
+ if re.search('queue_tm_rsp\)\(', fo):
+ buf += "void " + fabric_mod_name + "_queue_tm_rsp(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return;\n"
+ buf += "}\n\n"
+ bufi += "void " + fabric_mod_name + "_queue_tm_rsp(struct se_cmd *);\n"
+
+ if re.search('aborted_task\)\(', fo):
+ buf += "void " + fabric_mod_name + "_aborted_task(struct se_cmd *se_cmd)\n"
+ buf += "{\n"
+ buf += " return;\n"
+ buf += "}\n\n"
+ bufi += "void " + fabric_mod_name + "_aborted_task(struct se_cmd *);\n"
+
+ ret = p.write(buf)
+ if ret:
+ tcm_mod_err("Unable to write f: " + f)
+
+ p.close()
+
+ ret = pi.write(bufi)
+ if ret:
+ tcm_mod_err("Unable to write fi: " + fi)
+
+ pi.close()
+ return
+
+def tcm_mod_build_kbuild(fabric_mod_dir_var, fabric_mod_name):
+
+ buf = ""
+ f = fabric_mod_dir_var + "/Makefile"
+ print "Writing file: " + f
+
+ p = open(f, 'w')
+ if not p:
+ tcm_mod_err("Unable to open file: " + f)
+
+ buf += fabric_mod_name + "-objs := " + fabric_mod_name + "_fabric.o \\\n"
+ buf += " " + fabric_mod_name + "_configfs.o\n"
+ buf += "obj-$(CONFIG_" + fabric_mod_name.upper() + ") += " + fabric_mod_name + ".o\n"
+
+ ret = p.write(buf)
+ if ret:
+ tcm_mod_err("Unable to write f: " + f)
+
+ p.close()
+ return
+
+def tcm_mod_build_kconfig(fabric_mod_dir_var, fabric_mod_name):
+
+ buf = ""
+ f = fabric_mod_dir_var + "/Kconfig"
+ print "Writing file: " + f
+
+ p = open(f, 'w')
+ if not p:
+ tcm_mod_err("Unable to open file: " + f)
+
+ buf = "config " + fabric_mod_name.upper() + "\n"
+ buf += " tristate \"" + fabric_mod_name.upper() + " fabric module\"\n"
+ buf += " depends on TARGET_CORE && CONFIGFS_FS\n"
+ buf += " default n\n"
+ buf += " ---help---\n"
+ buf += " Say Y here to enable the " + fabric_mod_name.upper() + " fabric module\n"
+
+ ret = p.write(buf)
+ if ret:
+ tcm_mod_err("Unable to write f: " + f)
+
+ p.close()
+ return
+
+def tcm_mod_add_kbuild(tcm_dir, fabric_mod_name):
+ buf = "obj-$(CONFIG_" + fabric_mod_name.upper() + ") += " + fabric_mod_name.lower() + "/\n"
+ kbuild = tcm_dir + "/drivers/target/Makefile"
+
+ f = open(kbuild, 'a')
+ f.write(buf)
+ f.close()
+ return
+
+def tcm_mod_add_kconfig(tcm_dir, fabric_mod_name):
+ buf = "source \"drivers/target/" + fabric_mod_name.lower() + "/Kconfig\"\n"
+ kconfig = tcm_dir + "/drivers/target/Kconfig"
+
+ f = open(kconfig, 'a')
+ f.write(buf)
+ f.close()
+ return
+
+def main(modname, proto_ident):
+# proto_ident = "FC"
+# proto_ident = "SAS"
+# proto_ident = "iSCSI"
+
+ tcm_dir = os.getcwd();
+ tcm_dir += "/../../"
+ print "tcm_dir: " + tcm_dir
+ fabric_mod_name = modname
+ fabric_mod_dir = tcm_dir + "drivers/target/" + fabric_mod_name
+ print "Set fabric_mod_name: " + fabric_mod_name
+ print "Set fabric_mod_dir: " + fabric_mod_dir
+ print "Using proto_ident: " + proto_ident
+
+ if proto_ident != "FC" and proto_ident != "SAS" and proto_ident != "iSCSI":
+ print "Unsupported proto_ident: " + proto_ident
+ sys.exit(1)
+
+ ret = tcm_mod_create_module_subdir(fabric_mod_dir)
+ if ret:
+ print "tcm_mod_create_module_subdir() failed because module already exists!"
+ sys.exit(1)
+
+ tcm_mod_build_base_includes(proto_ident, fabric_mod_dir, fabric_mod_name)
+ tcm_mod_scan_fabric_ops(tcm_dir)
+ tcm_mod_dump_fabric_ops(proto_ident, fabric_mod_dir, fabric_mod_name)
+ tcm_mod_build_configfs(proto_ident, fabric_mod_dir, fabric_mod_name)
+ tcm_mod_build_kbuild(fabric_mod_dir, fabric_mod_name)
+ tcm_mod_build_kconfig(fabric_mod_dir, fabric_mod_name)
+
+ input = raw_input("Would you like to add " + fabric_mod_name + " to drivers/target/Makefile..? [yes,no]: ")
+ if input == "yes" or input == "y":
+ tcm_mod_add_kbuild(tcm_dir, fabric_mod_name)
+
+ input = raw_input("Would you like to add " + fabric_mod_name + " to drivers/target/Kconfig..? [yes,no]: ")
+ if input == "yes" or input == "y":
+ tcm_mod_add_kconfig(tcm_dir, fabric_mod_name)
+
+ return
+
+parser = optparse.OptionParser()
+parser.add_option('-m', '--modulename', help='Module name', dest='modname',
+ action='store', nargs=1, type='string')
+parser.add_option('-p', '--protoident', help='Protocol Ident', dest='protoident',
+ action='store', nargs=1, type='string')
+
+(opts, args) = parser.parse_args()
+
+mandatories = ['modname', 'protoident']
+for m in mandatories:
+ if not opts.__dict__[m]:
+ print "mandatory option is missing\n"
+ parser.print_help()
+ exit(-1)
+
+if __name__ == "__main__":
+
+ main(str(opts.modname), opts.protoident)
diff --git a/kernel/Documentation/target/tcm_mod_builder.txt b/kernel/Documentation/target/tcm_mod_builder.txt
new file mode 100644
index 000000000..84533d8e7
--- /dev/null
+++ b/kernel/Documentation/target/tcm_mod_builder.txt
@@ -0,0 +1,145 @@
+>>>>>>>>>> The TCM v4 fabric module script generator <<<<<<<<<<
+
+Greetings all,
+
+This document is intended to be a mini-HOWTO for using the tcm_mod_builder.py
+script to generate a brand new functional TCM v4 fabric .ko module of your very own,
+that once built can be immediately be loaded to start access the new TCM/ConfigFS
+fabric skeleton, by simply using:
+
+ modprobe $TCM_NEW_MOD
+ mkdir -p /sys/kernel/config/target/$TCM_NEW_MOD
+
+This script will create a new drivers/target/$TCM_NEW_MOD/, and will do the following
+
+ *) Generate new API callers for drivers/target/target_core_fabric_configs.c logic
+ ->make_nodeacl(), ->drop_nodeacl(), ->make_tpg(), ->drop_tpg()
+ ->make_wwn(), ->drop_wwn(). These are created into $TCM_NEW_MOD/$TCM_NEW_MOD_configfs.c
+ *) Generate basic infrastructure for loading/unloading LKMs and TCM/ConfigFS fabric module
+ using a skeleton struct target_core_fabric_ops API template.
+ *) Based on user defined T10 Proto_Ident for the new fabric module being built,
+ the TransportID / Initiator and Target WWPN related handlers for
+ SPC-3 persistent reservation are automatically generated in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c
+ using drivers/target/target_core_fabric_lib.c logic.
+ *) NOP API calls for all other Data I/O path and fabric dependent attribute logic
+ in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c
+
+tcm_mod_builder.py depends upon the mandatory '-p $PROTO_IDENT' and '-m
+$FABRIC_MOD_name' parameters, and actually running the script looks like:
+
+target:/mnt/sdb/lio-core-2.6.git/Documentation/target# python tcm_mod_builder.py -p iSCSI -m tcm_nab5000
+tcm_dir: /mnt/sdb/lio-core-2.6.git/Documentation/target/../../
+Set fabric_mod_name: tcm_nab5000
+Set fabric_mod_dir:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
+Using proto_ident: iSCSI
+Creating fabric_mod_dir:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
+Writing file:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_base.h
+Using tcm_mod_scan_fabric_ops:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../include/target/target_core_fabric_ops.h
+Writing file:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.c
+Writing file:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.h
+Writing file:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_configfs.c
+Writing file:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kbuild
+Writing file:
+/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kconfig
+Would you like to add tcm_nab5000to drivers/target/Kbuild..? [yes,no]: yes
+Would you like to add tcm_nab5000to drivers/target/Kconfig..? [yes,no]: yes
+
+At the end of tcm_mod_builder.py. the script will ask to add the following
+line to drivers/target/Kbuild:
+
+ obj-$(CONFIG_TCM_NAB5000) += tcm_nab5000/
+
+and the same for drivers/target/Kconfig:
+
+ source "drivers/target/tcm_nab5000/Kconfig"
+
+*) Run 'make menuconfig' and select the new CONFIG_TCM_NAB5000 item:
+
+ <M> TCM_NAB5000 fabric module
+
+*) Build using 'make modules', once completed you will have:
+
+target:/mnt/sdb/lio-core-2.6.git# ls -la drivers/target/tcm_nab5000/
+total 1348
+drwxr-xr-x 2 root root 4096 2010-10-05 03:23 .
+drwxr-xr-x 9 root root 4096 2010-10-05 03:22 ..
+-rw-r--r-- 1 root root 282 2010-10-05 03:22 Kbuild
+-rw-r--r-- 1 root root 171 2010-10-05 03:22 Kconfig
+-rw-r--r-- 1 root root 49 2010-10-05 03:23 modules.order
+-rw-r--r-- 1 root root 738 2010-10-05 03:22 tcm_nab5000_base.h
+-rw-r--r-- 1 root root 9096 2010-10-05 03:22 tcm_nab5000_configfs.c
+-rw-r--r-- 1 root root 191200 2010-10-05 03:23 tcm_nab5000_configfs.o
+-rw-r--r-- 1 root root 40504 2010-10-05 03:23 .tcm_nab5000_configfs.o.cmd
+-rw-r--r-- 1 root root 5414 2010-10-05 03:22 tcm_nab5000_fabric.c
+-rw-r--r-- 1 root root 2016 2010-10-05 03:22 tcm_nab5000_fabric.h
+-rw-r--r-- 1 root root 190932 2010-10-05 03:23 tcm_nab5000_fabric.o
+-rw-r--r-- 1 root root 40713 2010-10-05 03:23 .tcm_nab5000_fabric.o.cmd
+-rw-r--r-- 1 root root 401861 2010-10-05 03:23 tcm_nab5000.ko
+-rw-r--r-- 1 root root 265 2010-10-05 03:23 .tcm_nab5000.ko.cmd
+-rw-r--r-- 1 root root 459 2010-10-05 03:23 tcm_nab5000.mod.c
+-rw-r--r-- 1 root root 23896 2010-10-05 03:23 tcm_nab5000.mod.o
+-rw-r--r-- 1 root root 22655 2010-10-05 03:23 .tcm_nab5000.mod.o.cmd
+-rw-r--r-- 1 root root 379022 2010-10-05 03:23 tcm_nab5000.o
+-rw-r--r-- 1 root root 211 2010-10-05 03:23 .tcm_nab5000.o.cmd
+
+*) Load the new module, create a lun_0 configfs group, and add new TCM Core
+ IBLOCK backstore symlink to port:
+
+target:/mnt/sdb/lio-core-2.6.git# insmod drivers/target/tcm_nab5000.ko
+target:/mnt/sdb/lio-core-2.6.git# mkdir -p /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0
+target:/mnt/sdb/lio-core-2.6.git# cd /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0/
+target:/sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0# ln -s /sys/kernel/config/target/core/iblock_0/lvm_test0 nab5000_port
+
+target:/sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0# cd -
+target:/mnt/sdb/lio-core-2.6.git# tree /sys/kernel/config/target/nab5000/
+/sys/kernel/config/target/nab5000/
+|-- discovery_auth
+|-- iqn.foo
+| `-- tpgt_1
+| |-- acls
+| |-- attrib
+| |-- lun
+| | `-- lun_0
+| | |-- alua_tg_pt_gp
+| | |-- alua_tg_pt_offline
+| | |-- alua_tg_pt_status
+| | |-- alua_tg_pt_write_md
+| | `-- nab5000_port -> ../../../../../../target/core/iblock_0/lvm_test0
+| |-- np
+| `-- param
+`-- version
+
+target:/mnt/sdb/lio-core-2.6.git# lsmod
+Module Size Used by
+tcm_nab5000 3935 4
+iscsi_target_mod 193211 0
+target_core_stgt 8090 0
+target_core_pscsi 11122 1
+target_core_file 9172 2
+target_core_iblock 9280 1
+target_core_mod 228575 31
+tcm_nab5000,iscsi_target_mod,target_core_stgt,target_core_pscsi,target_core_file,target_core_iblock
+libfc 73681 0
+scsi_debug 56265 0
+scsi_tgt 8666 1 target_core_stgt
+configfs 20644 2 target_core_mod
+
+----------------------------------------------------------------------
+
+Future TODO items:
+
+ *) Add more T10 proto_idents
+ *) Make tcm_mod_dump_fabric_ops() smarter and generate function pointer
+ defs directly from include/target/target_core_fabric_ops.h:struct target_core_fabric_ops
+ structure members.
+
+October 5th, 2010
+Nicholas A. Bellinger <nab@linux-iscsi.org>
diff --git a/kernel/Documentation/target/tcmu-design.txt b/kernel/Documentation/target/tcmu-design.txt
new file mode 100644
index 000000000..263b90751
--- /dev/null
+++ b/kernel/Documentation/target/tcmu-design.txt
@@ -0,0 +1,372 @@
+Contents:
+
+1) TCM Userspace Design
+ a) Background
+ b) Benefits
+ c) Design constraints
+ d) Implementation overview
+ i. Mailbox
+ ii. Command ring
+ iii. Data Area
+ e) Device discovery
+ f) Device events
+ g) Other contingencies
+2) Writing a user pass-through handler
+ a) Discovering and configuring TCMU uio devices
+ b) Waiting for events on the device(s)
+ c) Managing the command ring
+3) A final note
+
+
+TCM Userspace Design
+--------------------
+
+TCM is another name for LIO, an in-kernel iSCSI target (server).
+Existing TCM targets run in the kernel. TCMU (TCM in Userspace)
+allows userspace programs to be written which act as iSCSI targets.
+This document describes the design.
+
+The existing kernel provides modules for different SCSI transport
+protocols. TCM also modularizes the data storage. There are existing
+modules for file, block device, RAM or using another SCSI device as
+storage. These are called "backstores" or "storage engines". These
+built-in modules are implemented entirely as kernel code.
+
+Background:
+
+In addition to modularizing the transport protocol used for carrying
+SCSI commands ("fabrics"), the Linux kernel target, LIO, also modularizes
+the actual data storage as well. These are referred to as "backstores"
+or "storage engines". The target comes with backstores that allow a
+file, a block device, RAM, or another SCSI device to be used for the
+local storage needed for the exported SCSI LUN. Like the rest of LIO,
+these are implemented entirely as kernel code.
+
+These backstores cover the most common use cases, but not all. One new
+use case that other non-kernel target solutions, such as tgt, are able
+to support is using Gluster's GLFS or Ceph's RBD as a backstore. The
+target then serves as a translator, allowing initiators to store data
+in these non-traditional networked storage systems, while still only
+using standard protocols themselves.
+
+If the target is a userspace process, supporting these is easy. tgt,
+for example, needs only a small adapter module for each, because the
+modules just use the available userspace libraries for RBD and GLFS.
+
+Adding support for these backstores in LIO is considerably more
+difficult, because LIO is entirely kernel code. Instead of undertaking
+the significant work to port the GLFS or RBD APIs and protocols to the
+kernel, another approach is to create a userspace pass-through
+backstore for LIO, "TCMU".
+
+
+Benefits:
+
+In addition to allowing relatively easy support for RBD and GLFS, TCMU
+will also allow easier development of new backstores. TCMU combines
+with the LIO loopback fabric to become something similar to FUSE
+(Filesystem in Userspace), but at the SCSI layer instead of the
+filesystem layer. A SUSE, if you will.
+
+The disadvantage is there are more distinct components to configure, and
+potentially to malfunction. This is unavoidable, but hopefully not
+fatal if we're careful to keep things as simple as possible.
+
+Design constraints:
+
+- Good performance: high throughput, low latency
+- Cleanly handle if userspace:
+ 1) never attaches
+ 2) hangs
+ 3) dies
+ 4) misbehaves
+- Allow future flexibility in user & kernel implementations
+- Be reasonably memory-efficient
+- Simple to configure & run
+- Simple to write a userspace backend
+
+
+Implementation overview:
+
+The core of the TCMU interface is a memory region that is shared
+between kernel and userspace. Within this region is: a control area
+(mailbox); a lockless producer/consumer circular buffer for commands
+to be passed up, and status returned; and an in/out data buffer area.
+
+TCMU uses the pre-existing UIO subsystem. UIO allows device driver
+development in userspace, and this is conceptually very close to the
+TCMU use case, except instead of a physical device, TCMU implements a
+memory-mapped layout designed for SCSI commands. Using UIO also
+benefits TCMU by handling device introspection (e.g. a way for
+userspace to determine how large the shared region is) and signaling
+mechanisms in both directions.
+
+There are no embedded pointers in the memory region. Everything is
+expressed as an offset from the region's starting address. This allows
+the ring to still work if the user process dies and is restarted with
+the region mapped at a different virtual address.
+
+See target_core_user.h for the struct definitions.
+
+The Mailbox:
+
+The mailbox is always at the start of the shared memory region, and
+contains a version, details about the starting offset and size of the
+command ring, and head and tail pointers to be used by the kernel and
+userspace (respectively) to put commands on the ring, and indicate
+when the commands are completed.
+
+version - 1 (userspace should abort if otherwise)
+flags - none yet defined.
+cmdr_off - The offset of the start of the command ring from the start
+of the memory region, to account for the mailbox size.
+cmdr_size - The size of the command ring. This does *not* need to be a
+power of two.
+cmd_head - Modified by the kernel to indicate when a command has been
+placed on the ring.
+cmd_tail - Modified by userspace to indicate when it has completed
+processing of a command.
+
+The Command Ring:
+
+Commands are placed on the ring by the kernel incrementing
+mailbox.cmd_head by the size of the command, modulo cmdr_size, and
+then signaling userspace via uio_event_notify(). Once the command is
+completed, userspace updates mailbox.cmd_tail in the same way and
+signals the kernel via a 4-byte write(). When cmd_head equals
+cmd_tail, the ring is empty -- no commands are currently waiting to be
+processed by userspace.
+
+TCMU commands are 8-byte aligned. They start with a common header
+containing "len_op", a 32-bit value that stores the length, as well as
+the opcode in the lowest unused bits. It also contains cmd_id and
+flags fields for setting by the kernel (kflags) and userspace
+(uflags).
+
+Currently only two opcodes are defined, TCMU_OP_CMD and TCMU_OP_PAD.
+
+When the opcode is CMD, the entry in the command ring is a struct
+tcmu_cmd_entry. Userspace finds the SCSI CDB (Command Data Block) via
+tcmu_cmd_entry.req.cdb_off. This is an offset from the start of the
+overall shared memory region, not the entry. The data in/out buffers
+are accessible via tht req.iov[] array. iov_cnt contains the number of
+entries in iov[] needed to describe either the Data-In or Data-Out
+buffers. For bidirectional commands, iov_cnt specifies how many iovec
+entries cover the Data-Out area, and iov_bidi_count specifies how many
+iovec entries immediately after that in iov[] cover the Data-In
+area. Just like other fields, iov.iov_base is an offset from the start
+of the region.
+
+When completing a command, userspace sets rsp.scsi_status, and
+rsp.sense_buffer if necessary. Userspace then increments
+mailbox.cmd_tail by entry.hdr.length (mod cmdr_size) and signals the
+kernel via the UIO method, a 4-byte write to the file descriptor.
+
+When the opcode is PAD, userspace only updates cmd_tail as above --
+it's a no-op. (The kernel inserts PAD entries to ensure each CMD entry
+is contiguous within the command ring.)
+
+More opcodes may be added in the future. If userspace encounters an
+opcode it does not handle, it must set UNKNOWN_OP bit (bit 0) in
+hdr.uflags, update cmd_tail, and proceed with processing additional
+commands, if any.
+
+The Data Area:
+
+This is shared-memory space after the command ring. The organization
+of this area is not defined in the TCMU interface, and userspace
+should access only the parts referenced by pending iovs.
+
+
+Device Discovery:
+
+Other devices may be using UIO besides TCMU. Unrelated user processes
+may also be handling different sets of TCMU devices. TCMU userspace
+processes must find their devices by scanning sysfs
+class/uio/uio*/name. For TCMU devices, these names will be of the
+format:
+
+tcm-user/<hba_num>/<device_name>/<subtype>/<path>
+
+where "tcm-user" is common for all TCMU-backed UIO devices. <hba_num>
+and <device_name> allow userspace to find the device's path in the
+kernel target's configfs tree. Assuming the usual mount point, it is
+found at:
+
+/sys/kernel/config/target/core/user_<hba_num>/<device_name>
+
+This location contains attributes such as "hw_block_size", that
+userspace needs to know for correct operation.
+
+<subtype> will be a userspace-process-unique string to identify the
+TCMU device as expecting to be backed by a certain handler, and <path>
+will be an additional handler-specific string for the user process to
+configure the device, if needed. The name cannot contain ':', due to
+LIO limitations.
+
+For all devices so discovered, the user handler opens /dev/uioX and
+calls mmap():
+
+mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)
+
+where size must be equal to the value read from
+/sys/class/uio/uioX/maps/map0/size.
+
+
+Device Events:
+
+If a new device is added or removed, a notification will be broadcast
+over netlink, using a generic netlink family name of "TCM-USER" and a
+multicast group named "config". This will include the UIO name as
+described in the previous section, as well as the UIO minor
+number. This should allow userspace to identify both the UIO device and
+the LIO device, so that after determining the device is supported
+(based on subtype) it can take the appropriate action.
+
+
+Other contingencies:
+
+Userspace handler process never attaches:
+
+- TCMU will post commands, and then abort them after a timeout period
+ (30 seconds.)
+
+Userspace handler process is killed:
+
+- It is still possible to restart and re-connect to TCMU
+ devices. Command ring is preserved. However, after the timeout period,
+ the kernel will abort pending tasks.
+
+Userspace handler process hangs:
+
+- The kernel will abort pending tasks after a timeout period.
+
+Userspace handler process is malicious:
+
+- The process can trivially break the handling of devices it controls,
+ but should not be able to access kernel memory outside its shared
+ memory areas.
+
+
+Writing a user pass-through handler (with example code)
+-------------------------------------------------------
+
+A user process handing a TCMU device must support the following:
+
+a) Discovering and configuring TCMU uio devices
+b) Waiting for events on the device(s)
+c) Managing the command ring: Parsing operations and commands,
+ performing work as needed, setting response fields (scsi_status and
+ possibly sense_buffer), updating cmd_tail, and notifying the kernel
+ that work has been finished
+
+First, consider instead writing a plugin for tcmu-runner. tcmu-runner
+implements all of this, and provides a higher-level API for plugin
+authors.
+
+TCMU is designed so that multiple unrelated processes can manage TCMU
+devices separately. All handlers should make sure to only open their
+devices, based opon a known subtype string.
+
+a) Discovering and configuring TCMU UIO devices:
+
+(error checking omitted for brevity)
+
+int fd, dev_fd;
+char buf[256];
+unsigned long long map_len;
+void *map;
+
+fd = open("/sys/class/uio/uio0/name", O_RDONLY);
+ret = read(fd, buf, sizeof(buf));
+close(fd);
+buf[ret-1] = '\0'; /* null-terminate and chop off the \n */
+
+/* we only want uio devices whose name is a format we expect */
+if (strncmp(buf, "tcm-user", 8))
+ exit(-1);
+
+/* Further checking for subtype also needed here */
+
+fd = open(/sys/class/uio/%s/maps/map0/size, O_RDONLY);
+ret = read(fd, buf, sizeof(buf));
+close(fd);
+str_buf[ret-1] = '\0'; /* null-terminate and chop off the \n */
+
+map_len = strtoull(buf, NULL, 0);
+
+dev_fd = open("/dev/uio0", O_RDWR);
+map = mmap(NULL, map_len, PROT_READ|PROT_WRITE, MAP_SHARED, dev_fd, 0);
+
+
+b) Waiting for events on the device(s)
+
+while (1) {
+ char buf[4];
+
+ int ret = read(dev_fd, buf, 4); /* will block */
+
+ handle_device_events(dev_fd, map);
+}
+
+
+c) Managing the command ring
+
+#include <linux/target_core_user.h>
+
+int handle_device_events(int fd, void *map)
+{
+ struct tcmu_mailbox *mb = map;
+ struct tcmu_cmd_entry *ent = (void *) mb + mb->cmdr_off + mb->cmd_tail;
+ int did_some_work = 0;
+
+ /* Process events from cmd ring until we catch up with cmd_head */
+ while (ent != (void *)mb + mb->cmdr_off + mb->cmd_head) {
+
+ if (tcmu_hdr_get_op(ent->hdr.len_op) == TCMU_OP_CMD) {
+ uint8_t *cdb = (void *)mb + ent->req.cdb_off;
+ bool success = true;
+
+ /* Handle command here. */
+ printf("SCSI opcode: 0x%x\n", cdb[0]);
+
+ /* Set response fields */
+ if (success)
+ ent->rsp.scsi_status = SCSI_NO_SENSE;
+ else {
+ /* Also fill in rsp->sense_buffer here */
+ ent->rsp.scsi_status = SCSI_CHECK_CONDITION;
+ }
+ }
+ else if (tcmu_hdr_get_op(ent->hdr.len_op) != TCMU_OP_PAD) {
+ /* Tell the kernel we didn't handle unknown opcodes */
+ ent->hdr.uflags |= TCMU_UFLAG_UNKNOWN_OP;
+ }
+ else {
+ /* Do nothing for PAD entries except update cmd_tail */
+ }
+
+ /* update cmd_tail */
+ mb->cmd_tail = (mb->cmd_tail + tcmu_hdr_get_len(&ent->hdr)) % mb->cmdr_size;
+ ent = (void *) mb + mb->cmdr_off + mb->cmd_tail;
+ did_some_work = 1;
+ }
+
+ /* Notify the kernel that work has been finished */
+ if (did_some_work) {
+ uint32_t buf = 0;
+
+ write(fd, &buf, 4);
+ }
+
+ return 0;
+}
+
+
+A final note
+------------
+
+Please be careful to return codes as defined by the SCSI
+specifications. These are different than some values defined in the
+scsi/scsi.h include file. For example, CHECK CONDITION's status code
+is 2, not 1.