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Create new enum qdisc_drop_reason and trace_qdisc_drop tracepoint for qdisc layer drop diagnostics with direct qdisc context visibility. The new tracepoint includes qdisc handle, parent, kind (name), and device information. Existing SKB_DROP_REASON_QDISC_DROP is retained for backwards compatibility via kfree_skb_reason(). Convert qdiscs with drop reasons to use the new infrastructure. Change CAKE's cobalt_should_drop() return type from enum skb_drop_reason to enum qdisc_drop_reason to fix implicit enum conversion warnings. Use QDISC_DROP_UNSPEC as the 'not dropped' sentinel instead of SKB_NOT_DROPPED_YET. Both have the same compiled value (0), so the comparison logic remains semantically equivalent. Signed-off-by: Jesper Dangaard Brouer <hawk@kernel.org> Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com> Link: https://patch.msgid.link/177211345275.3011628.1974310302645218067.stgit@firesoul Signed-off-by: Jakub Kicinski <kuba@kernel.org>
50 lines
1.3 KiB
C
50 lines
1.3 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_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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/**
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* @SKB_DROP_REASON_SUBSYS_QDISC: TC qdisc drop reasons,
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* see include/net/dropreason-qdisc.h
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*/
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SKB_DROP_REASON_SUBSYS_QDISC,
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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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