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authorNeil Horman <nhorman@tuxdriver.com>2009-05-21 07:36:08 +0000
committerDavid S. Miller <davem@davemloft.net>2009-05-21 16:50:21 -0700
commit4ea7e38696c7e798c47ebbecadfd392f23f814f9 (patch)
tree1e144d0c79fb667860ff7fa0ed203984e888ddab /net/core/net-traces.c
parentd95ed9275edcb8995bda31005bb3f55e087626d7 (diff)
downloadlinux-4ea7e38696c7e798c47ebbecadfd392f23f814f9.tar.bz2
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 'net/core/net-traces.c')
-rw-r--r--net/core/net-traces.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index c8fb45665e4f..b07b25bd2cde 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -20,6 +20,7 @@
#include <linux/netlink.h>
#include <linux/net_dropmon.h>
#include <trace/skb.h>
+#include <trace/napi.h>
#include <asm/unaligned.h>
#include <asm/bitops.h>
@@ -27,3 +28,6 @@
DEFINE_TRACE(kfree_skb);
EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);
+
+DEFINE_TRACE(napi_poll);
+EXPORT_TRACEPOINT_SYMBOL_GPL(napi_poll);