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scsi: iscsi: Capture iscsi debug messages using tracepoints
This commit enhances iscsi initiator modules to capture iscsi debug messages using linux kernel tracepoint facility: https://www.kernel.org/doc/Documentation/trace/tracepoints.txt The following tracepoint events have been created under the iscsi tracepoint event group: iscsi_dbg_conn - to capture connection debug messages (libiscsi module) iscsi_dbg_session - to capture session debug messages (libiscsi module) iscsi_dbg_eh - to capture error handling debug messages (libiscsi module) iscsi_dbg_tcp - to capture iscsi tcp debug messages (libiscsi_tcp module) iscsi_dbg_sw_tcp - to capture iscsi sw tcp debug messages (iscsi_tcp module) iscsi_dbg_trans_session - to cpature iscsi transsport sess debug messages (scsi_transport_iscsi module) iscsi_dbg_trans_conn - to capture iscsi transport conn debug messages (scsi_transport_iscsi module) [mkp: typos] Signed-off-by: Fred Herard <fred.herard@oracle.com> Reviewed-by: Rajan Shanmugavelu <rajan.shanmugavelu@oracle.com> Reviewed-by: Lee Duncan <lduncan@suse.com> Reviewed-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -44,6 +44,7 @@
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include <trace/events/iscsi.h>
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#include "iscsi_tcp.h"
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@ -72,6 +73,9 @@ MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
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iscsi_conn_printk(KERN_INFO, _conn, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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iscsi_dbg_trace(trace_iscsi_dbg_sw_tcp, \
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&(_conn)->cls_conn->dev, \
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"%s " dbg_fmt, __func__, ##arg);\
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} while (0);
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@ -40,6 +40,7 @@
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include <scsi/libiscsi.h>
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#include <trace/events/iscsi.h>
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static int iscsi_dbg_lib_conn;
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module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
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@ -68,6 +69,9 @@ MODULE_PARM_DESC(debug_libiscsi_eh,
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iscsi_conn_printk(KERN_INFO, _conn, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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iscsi_dbg_trace(trace_iscsi_dbg_conn, \
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&(_conn)->cls_conn->dev, \
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"%s " dbg_fmt, __func__, ##arg);\
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} while (0);
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#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
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@ -76,6 +80,9 @@ MODULE_PARM_DESC(debug_libiscsi_eh,
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iscsi_session_printk(KERN_INFO, _session, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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iscsi_dbg_trace(trace_iscsi_dbg_session, \
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&(_session)->cls_session->dev, \
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"%s " dbg_fmt, __func__, ##arg); \
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} while (0);
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#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
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@ -84,6 +91,9 @@ MODULE_PARM_DESC(debug_libiscsi_eh,
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iscsi_session_printk(KERN_INFO, _session, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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iscsi_dbg_trace(trace_iscsi_dbg_eh, \
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&(_session)->cls_session->dev, \
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"%s " dbg_fmt, __func__, ##arg); \
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} while (0);
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inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
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@ -43,6 +43,7 @@
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include <trace/events/iscsi.h>
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#include "iscsi_tcp.h"
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@ -65,6 +66,9 @@ MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp "
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iscsi_conn_printk(KERN_INFO, _conn, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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iscsi_dbg_trace(trace_iscsi_dbg_tcp, \
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&(_conn)->cls_conn->dev, \
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"%s " dbg_fmt, __func__, ##arg);\
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} while (0);
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static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
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@ -37,6 +37,18 @@
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#define ISCSI_TRANSPORT_VERSION "2.0-870"
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#define CREATE_TRACE_POINTS
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#include <trace/events/iscsi.h>
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/*
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* Export tracepoint symbols to be used by other modules.
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*/
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EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
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EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
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EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
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EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
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EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
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static int dbg_session;
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module_param_named(debug_session, dbg_session, int,
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S_IRUGO | S_IWUSR);
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@ -59,6 +71,9 @@ MODULE_PARM_DESC(debug_conn,
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iscsi_cls_session_printk(KERN_INFO, _session, \
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"%s: " dbg_fmt, \
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__func__, ##arg); \
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iscsi_dbg_trace(trace_iscsi_dbg_trans_session, \
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&(_session)->dev, \
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"%s " dbg_fmt, __func__, ##arg); \
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} while (0);
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#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
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@ -66,7 +81,10 @@ MODULE_PARM_DESC(debug_conn,
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if (dbg_conn) \
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iscsi_cls_conn_printk(KERN_INFO, _conn, \
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"%s: " dbg_fmt, \
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__func__, ##arg); \
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__func__, ##arg); \
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iscsi_dbg_trace(trace_iscsi_dbg_trans_conn, \
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&(_conn)->dev, \
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"%s " dbg_fmt, __func__, ##arg); \
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} while (0);
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struct iscsi_internal {
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@ -4497,6 +4515,20 @@ int iscsi_unregister_transport(struct iscsi_transport *tt)
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}
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EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
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void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
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struct device *dev, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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trace(dev, &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
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static __init int iscsi_transport_init(void)
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{
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int err;
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107
include/trace/events/iscsi.h
Normal file
107
include/trace/events/iscsi.h
Normal file
@ -0,0 +1,107 @@
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM iscsi
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#if !defined(_TRACE_ISCSI_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_ISCSI_H
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#include <linux/tracepoint.h>
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/* max debug message length */
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#define ISCSI_MSG_MAX 256
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/*
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* Declare tracepoint helper function.
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*/
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void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
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struct device *dev, const char *fmt, ...);
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/*
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* Declare event class for iscsi debug messages.
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*/
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DECLARE_EVENT_CLASS(iscsi_log_msg,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf),
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TP_STRUCT__entry(
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__string(dname, dev_name(dev) )
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__dynamic_array(char, msg, ISCSI_MSG_MAX )
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),
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TP_fast_assign(
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__assign_str(dname, dev_name(dev));
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vsnprintf(__get_str(msg), ISCSI_MSG_MAX, vaf->fmt, *vaf->va);
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),
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TP_printk("%s: %s",__get_str(dname), __get_str(msg)
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)
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);
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/*
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* Define event to capture iscsi connection debug messages.
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*/
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DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_conn,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf)
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);
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/*
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* Define event to capture iscsi session debug messages.
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*/
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DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_session,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf)
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);
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/*
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* Define event to capture iscsi error handling debug messages.
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*/
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DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_eh,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf)
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);
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/*
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* Define event to capture iscsi tcp debug messages.
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*/
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DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_tcp,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf)
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);
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/*
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* Define event to capture iscsi sw tcp debug messages.
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*/
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DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_sw_tcp,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf)
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);
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/*
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* Define event to capture iscsi transport session debug messages.
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*/
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DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_trans_session,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf)
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);
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/*
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* Define event to capture iscsi transport connection debug messages.
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*/
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DEFINE_EVENT(iscsi_log_msg, iscsi_dbg_trans_conn,
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TP_PROTO(struct device *dev, struct va_format *vaf),
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TP_ARGS(dev, vaf)
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);
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#endif /* _TRACE_ISCSI_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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