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4ea7e38696
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>
64 lines
1.1 KiB
C
64 lines
1.1 KiB
C
#ifndef __NET_DROPMON_H
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#define __NET_DROPMON_H
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#include <linux/netlink.h>
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#include <linux/types.h>
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struct net_dm_drop_point {
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__u8 pc[8];
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__u32 count;
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};
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#define is_drop_point_hw(x) do {\
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int ____i, ____j;\
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for (____i = 0; ____i < 8; i ____i++)\
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____j |= x[____i];\
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____j;\
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} while (0)
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#define NET_DM_CFG_VERSION 0
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#define NET_DM_CFG_ALERT_COUNT 1
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#define NET_DM_CFG_ALERT_DELAY 2
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#define NET_DM_CFG_MAX 3
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struct net_dm_config_entry {
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__u32 type;
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__u64 data __attribute__((aligned(8)));
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};
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struct net_dm_config_msg {
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__u32 entries;
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struct net_dm_config_entry options[0];
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};
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struct net_dm_alert_msg {
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__u32 entries;
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struct net_dm_drop_point points[0];
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};
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struct net_dm_user_msg {
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union {
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struct net_dm_config_msg user;
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struct net_dm_alert_msg alert;
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} u;
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};
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/* These are the netlink message types for this protocol */
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enum {
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NET_DM_CMD_UNSPEC = 0,
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NET_DM_CMD_ALERT,
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NET_DM_CMD_CONFIG,
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NET_DM_CMD_START,
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NET_DM_CMD_STOP,
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_NET_DM_CMD_MAX,
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};
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#define NET_DM_CMD_MAX (_NET_DM_CMD_MAX - 1)
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/*
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* Our group identifiers
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*/
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#define NET_DM_GRP_ALERT 1
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#endif
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