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ca30707dee
So far drop monitor supported only one alert mode in which a summary of locations in which packets were recently dropped was sent to user space. This alert mode is sufficient in order to understand that packets were dropped, but lacks information to perform a more detailed analysis. Add a new alert mode in which the dropped packet itself is passed to user space along with metadata: The drop location (as program counter and resolved symbol), ingress netdevice and drop timestamp. More metadata can be added in the future. To avoid performing expensive operations in the context in which kfree_skb() is invoked (can be hard IRQ), the dropped skb is cloned and queued on per-CPU skb drop list. Then, in process context the netlink message is allocated, prepared and finally sent to user space. The per-CPU skb drop list is limited to 1000 skbs to prevent exhausting the system's memory. Subsequent patches will make this limit configurable and also add a counter that indicates how many skbs were tail dropped. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
101 lines
2 KiB
C
101 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef __NET_DROPMON_H
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#define __NET_DROPMON_H
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#include <linux/types.h>
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#include <linux/netlink.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_PACKET_ALERT,
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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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enum net_dm_attr {
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NET_DM_ATTR_UNSPEC,
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NET_DM_ATTR_ALERT_MODE, /* u8 */
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NET_DM_ATTR_PC, /* u64 */
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NET_DM_ATTR_SYMBOL, /* string */
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NET_DM_ATTR_IN_PORT, /* nested */
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NET_DM_ATTR_TIMESTAMP, /* struct timespec */
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NET_DM_ATTR_PROTO, /* u16 */
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NET_DM_ATTR_PAYLOAD, /* binary */
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NET_DM_ATTR_PAD,
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__NET_DM_ATTR_MAX,
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NET_DM_ATTR_MAX = __NET_DM_ATTR_MAX - 1
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};
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/**
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* enum net_dm_alert_mode - Alert mode.
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* @NET_DM_ALERT_MODE_SUMMARY: A summary of recent drops is sent to user space.
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* @NET_DM_ALERT_MODE_PACKET: Each dropped packet is sent to user space along
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* with metadata.
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*/
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enum net_dm_alert_mode {
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NET_DM_ALERT_MODE_SUMMARY,
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NET_DM_ALERT_MODE_PACKET,
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};
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enum {
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NET_DM_ATTR_PORT_NETDEV_IFINDEX, /* u32 */
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__NET_DM_ATTR_PORT_MAX,
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NET_DM_ATTR_PORT_MAX = __NET_DM_ATTR_PORT_MAX - 1
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};
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#endif
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