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authorNeil Horman <nhorman@tuxdriver.com>2009-05-21 11:36:08 +0400
committerDavid S. Miller <davem@davemloft.net>2009-05-22 03:50:21 +0400
commit4ea7e38696c7e798c47ebbecadfd392f23f814f9 (patch)
tree1e144d0c79fb667860ff7fa0ed203984e888ddab /include/linux/net_dropmon.h
parentd95ed9275edcb8995bda31005bb3f55e087626d7 (diff)
downloadlinux-4ea7e38696c7e798c47ebbecadfd392f23f814f9.tar.xz
dropmon: add ability to detect when hardware dropsrxpackets
Patch to add the ability to detect drops in hardware interfaces via dropwatch. Adds a tracepoint to net_rx_action to signal everytime a napi instance is polled. The dropmon code then periodically checks to see if the rx_frames counter has changed, and if so, adds a drop notification to the netlink protocol, using the reserved all-0's vector to indicate the drop location was in hardware, rather than somewhere in the code. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> include/linux/net_dropmon.h | 8 ++ include/trace/napi.h | 11 +++ net/core/dev.c | 5 + net/core/drop_monitor.c | 124 ++++++++++++++++++++++++++++++++++++++++++-- net/core/net-traces.c | 4 + net/core/netpoll.c | 2 6 files changed, 149 insertions(+), 5 deletions(-) Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/net_dropmon.h')
-rw-r--r--include/linux/net_dropmon.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/net_dropmon.h b/include/linux/net_dropmon.h
index 0217fb81a630..e8a8b5c50ed0 100644
--- a/include/linux/net_dropmon.h
+++ b/include/linux/net_dropmon.h
@@ -2,12 +2,20 @@
#define __NET_DROPMON_H
#include <linux/netlink.h>
+#include <linux/types.h>
struct net_dm_drop_point {
__u8 pc[8];
__u32 count;
};
+#define is_drop_point_hw(x) do {\
+ int ____i, ____j;\
+ for (____i = 0; ____i < 8; i ____i++)\
+ ____j |= x[____i];\
+ ____j;\
+} while (0)
+
#define NET_DM_CFG_VERSION 0
#define NET_DM_CFG_ALERT_COUNT 1
#define NET_DM_CFG_ALERT_DELAY 2