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Date: Wed, 5 Dec 2007 11:19:45 +0000
From: Gerrit Renker <gerrit@....abdn.ac.uk>
To: dccp@...r.kernel.org
Cc: netdev@...r.kernel.org, Gerrit Renker <gerrit@....abdn.ac.uk>
Subject: [PATCH v2 0/3][BUG-FIX]: Test tree updates and bug fixes
This fixes a problem in the initial revision of the patch: The loss interval
history was not de-allocated when the initialisation of the packet history
failed. The identification of this problem is also thanks due to Arnaldo.
The interdiff to the previous revision is:
--- b/net/dccp/ccids/lib/tfrc_module.c
+++ b/net/dccp/ccids/lib/tfrc_module.c
@@ -26,7 +26,12 @@
if (rc == 0)
rc = packet_history_init();
+ if (rc == 0)
+ goto out;
+out_free_loss_intervals:
+ dccp_li_exit();
+out:
return rc;
}
-------------------------> Patch v2 <---------------------------------------
[TFRC]: Provide central source file and debug facility
This patch changes the tfrc_lib module in the following manner:
(1) a dedicated tfrc_module source file (this is later populated
with TX/RX hist and LI Database routines);
(2) a dedicated tfrc_pr_debug macro with toggle switch `tfrc_debug'.
Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@...di.co.nz>
---
net/dccp/ccids/Kconfig | 12 +++++---
net/dccp/ccids/lib/Makefile | 3 +-
net/dccp/ccids/lib/loss_interval.c | 2 -
net/dccp/ccids/lib/packet_history.c | 28 ++------------------
net/dccp/ccids/lib/packet_history.h | 3 --
net/dccp/ccids/lib/tfrc.h | 17 +++++++++---
net/dccp/ccids/lib/tfrc_module.c | 50 ++++++++++++++++++++++++++++++++++++
7 files changed, 78 insertions(+), 37 deletions(-)
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -39,8 +39,7 @@
#include <linux/ktime.h>
#include <linux/list.h>
#include <linux/slab.h>
-
-#include "../../dccp.h"
+#include "tfrc.h"
/* Number of later packets received before one is considered lost */
#define TFRC_RECV_NUM_LATE_LOSS 3
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -35,7 +35,6 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <linux/module.h>
#include <linux/string.h>
#include "packet_history.h"
@@ -277,39 +276,18 @@ void dccp_rx_hist_purge(struct dccp_rx_h
EXPORT_SYMBOL_GPL(dccp_rx_hist_purge);
-extern int __init dccp_li_init(void);
-extern void dccp_li_exit(void);
-
-static __init int packet_history_init(void)
+int __init packet_history_init(void)
{
- if (dccp_li_init() != 0)
- goto out;
-
tfrc_tx_hist = kmem_cache_create("tfrc_tx_hist",
sizeof(struct tfrc_tx_hist_entry), 0,
SLAB_HWCACHE_ALIGN, NULL);
- if (tfrc_tx_hist == NULL)
- goto out_li_exit;
-
- return 0;
-out_li_exit:
- dccp_li_exit();
-out:
- return -ENOBUFS;
+ return tfrc_tx_hist == NULL ? -ENOBUFS : 0;
}
-module_init(packet_history_init);
-static __exit void packet_history_exit(void)
+void __exit packet_history_exit(void)
{
if (tfrc_tx_hist != NULL) {
kmem_cache_destroy(tfrc_tx_hist);
tfrc_tx_hist = NULL;
}
- dccp_li_exit();
}
-module_exit(packet_history_exit);
-
-MODULE_AUTHOR("Ian McDonald <ian.mcdonald@...di.co.nz>, "
- "Arnaldo Carvalho de Melo <acme@...stprotocols.net>");
-MODULE_DESCRIPTION("DCCP TFRC library");
-MODULE_LICENSE("GPL");
--- a/net/dccp/ccids/lib/tfrc.h
+++ b/net/dccp/ccids/lib/tfrc.h
@@ -3,10 +3,11 @@
/*
* net/dccp/ccids/lib/tfrc.h
*
- * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- * Copyright (c) 2005 Ian McDonald <ian.mcdonald@...di.co.nz>
- * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@...ectiva.com.br>
- * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
+ * Copyright (c) 2007 The University of Aberdeen, Scotland, UK
+ * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
+ * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@...di.co.nz>
+ * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@...ectiva.com.br>
+ * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
*
* 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
@@ -15,6 +16,14 @@
*/
#include <linux/types.h>
#include <asm/div64.h>
+#include "../../dccp.h"
+
+#ifdef CONFIG_IP_DCCP_TFRC_DEBUG
+extern int tfrc_debug;
+#define tfrc_pr_debug(format, a...) DCCP_PR_DEBUG(tfrc_debug, format, ##a)
+#else
+#define tfrc_pr_debug(format, a...)
+#endif
/* integer-arithmetic divisions of type (a * 1000000)/b */
static inline u64 scaled_div(u64 a, u32 b)
--- /dev/null
+++ b/net/dccp/ccids/lib/tfrc_module.c
@@ -0,0 +1,50 @@
+/*
+ * TFRC: main module holding the pieces of the TFRC library together
+ *
+ * Copyright (c) 2007 The University of Aberdeen, Scotland, UK
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include "tfrc.h"
+
+/* Initialisation / Clean-up routines */
+extern int packet_history_init(void);
+extern void packet_history_exit(void);
+
+extern int dccp_li_init(void);
+extern void dccp_li_exit(void);
+
+#ifdef CONFIG_IP_DCCP_TFRC_DEBUG
+int tfrc_debug;
+module_param(tfrc_debug, bool, 0444);
+MODULE_PARM_DESC(tfrc_debug, "Enable debug messages");
+#endif
+
+static int __init tfrc_module_init(void)
+{
+ int rc = dccp_li_init();
+
+ if (rc == 0)
+ rc = packet_history_init();
+ if (rc == 0)
+ goto out;
+
+out_free_loss_intervals:
+ dccp_li_exit();
+out:
+ return rc;
+}
+module_init(tfrc_module_init);
+
+static void __exit tfrc_module_exit(void)
+{
+ packet_history_exit();
+ dccp_li_exit();
+}
+module_exit(tfrc_module_exit);
+
+MODULE_AUTHOR("Gerrit Renker <gerrit@....abdn.ac.uk>, "
+ "Ian McDonald <ian.mcdonald@...di.co.nz>, "
+ "Arnaldo Carvalho de Melo <acme@...stprotocols.net>");
+MODULE_DESCRIPTION("DCCP TFRC library");
+MODULE_LICENSE("GPL");
--- a/net/dccp/ccids/lib/Makefile
+++ b/net/dccp/ccids/lib/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_IP_DCCP_TFRC_LIB) += dccp_tfrc_lib.o
-dccp_tfrc_lib-y := loss_interval.o packet_history.o tfrc_equation.o
+dccp_tfrc_lib-y := tfrc_module.o tfrc_equation.o \
+ packet_history.o loss_interval.o
--- a/net/dccp/ccids/Kconfig
+++ b/net/dccp/ccids/Kconfig
@@ -63,10 +63,6 @@ config IP_DCCP_CCID3
If in doubt, say M.
-config IP_DCCP_TFRC_LIB
- depends on IP_DCCP_CCID3
- def_tristate IP_DCCP_CCID3
-
config IP_DCCP_CCID3_DEBUG
bool "CCID3 debugging messages"
depends on IP_DCCP_CCID3
@@ -110,5 +106,13 @@ config IP_DCCP_CCID3_RTO
is serious network congestion: experimenting with larger values should
therefore not be performed on WANs.
+# The TFRC Library: currently only has CCID 3 as customer
+config IP_DCCP_TFRC_LIB
+ depends on IP_DCCP_CCID3
+ def_tristate IP_DCCP_CCID3
+
+config IP_DCCP_TFRC_DEBUG
+ bool
+ default y if IP_DCCP_CCID3_DEBUG
endmenu
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -285,7 +285,7 @@ int __init dccp_li_init(void)
return dccp_li_cachep == NULL ? -ENOBUFS : 0;
}
-void dccp_li_exit(void)
+void __exit dccp_li_exit(void)
{
if (dccp_li_cachep != NULL) {
kmem_cache_destroy(dccp_li_cachep);
--
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