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071c0fc6fb
Extend drop reasons to make them usable by subsystems other than core by reserving the high 16 bits for a new subsystem ID, of which 0 of course is used for the existing reasons immediately. To still be able to have string reasons, restructure that code a bit to make the loopup under RCU, the only user of this (right now) is drop_monitor. Link: https://lore.kernel.org/netdev/00659771ed54353f92027702c5bbb84702da62ce.camel@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
32 lines
890 B
C
32 lines
890 B
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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/** @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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