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9d802da40b
Create a new drop reason subsystem for openvswitch and add the first drop reason to represent last-action drops. Last-action drops happen when a flow has an empty action list or there is no action that consumes the packet (output, userspace, recirc, etc). It is the most common way in which OVS drops packets. Implementation-wise, most of these skb-consuming actions already call "consume_skb" internally and return directly from within the do_execute_actions() loop so with minimal changes we can assume that any skb that exits the loop normally is a packet drop. Signed-off-by: Adrian Moreno <amorenoz@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _LINUX_DROPREASON_H
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#define _LINUX_DROPREASON_H
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#include <net/dropreason-core.h>
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/**
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* enum skb_drop_reason_subsys - subsystem tag for (extended) drop reasons
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*/
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enum skb_drop_reason_subsys {
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/** @SKB_DROP_REASON_SUBSYS_CORE: core drop reasons defined above */
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SKB_DROP_REASON_SUBSYS_CORE,
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/**
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* @SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE: mac80211 drop reasons
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* for unusable frames, see net/mac80211/drop.h
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*/
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SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE,
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/**
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* @SKB_DROP_REASON_SUBSYS_MAC80211_MONITOR: mac80211 drop reasons
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* for frames still going to monitor, see net/mac80211/drop.h
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*/
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SKB_DROP_REASON_SUBSYS_MAC80211_MONITOR,
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/**
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* @SKB_DROP_REASON_SUBSYS_OPENVSWITCH: openvswitch drop reasons,
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* see net/openvswitch/drop.h
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*/
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SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
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/** @SKB_DROP_REASON_SUBSYS_NUM: number of subsystems defined */
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SKB_DROP_REASON_SUBSYS_NUM
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};
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struct drop_reason_list {
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const char * const *reasons;
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size_t n_reasons;
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};
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/* Note: due to dynamic registrations, access must be under RCU */
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extern const struct drop_reason_list __rcu *
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drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_NUM];
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void drop_reasons_register_subsys(enum skb_drop_reason_subsys subsys,
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const struct drop_reason_list *list);
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void drop_reasons_unregister_subsys(enum skb_drop_reason_subsys subsys);
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#endif
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