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67713dff63
DualPI2 drops packets during dequeue but was using kfree_skb_reason() directly, bypassing trace_qdisc_drop. Convert to qdisc_dequeue_drop() and add QDISC_DROP_L4S_STEP_NON_ECN to the qdisc drop reason enum. - Set TCQ_F_DEQUEUE_DROPS flag in dualpi2_init() - Use enum qdisc_drop_reason in drop_and_retry() - Replace kfree_skb_reason() with qdisc_dequeue_drop() Signed-off-by: Jesper Dangaard Brouer <hawk@kernel.org> Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com> Link: https://patch.msgid.link/177211351978.3011628.11267023360997620069.stgit@firesoul Signed-off-by: Jakub Kicinski <kuba@kernel.org>
115 lines
3.7 KiB
C
115 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _LINUX_DROPREASON_QDISC_H
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#define _LINUX_DROPREASON_QDISC_H
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#include <net/dropreason.h>
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#define DEFINE_QDISC_DROP_REASON(FN, FNe) \
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FN(UNSPEC) \
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FN(GENERIC) \
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FN(OVERLIMIT) \
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FN(CONGESTED) \
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FN(MAXFLOWS) \
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FN(FLOOD_PROTECTION) \
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FN(BAND_LIMIT) \
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FN(HORIZON_LIMIT) \
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FN(FLOW_LIMIT) \
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FN(L4S_STEP_NON_ECN) \
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FNe(MAX)
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#undef FN
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#undef FNe
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#define FN(reason) QDISC_DROP_##reason,
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#define FNe(reason) QDISC_DROP_##reason
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/**
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* enum qdisc_drop_reason - reason why a qdisc dropped a packet
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*
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* Qdisc-specific drop reasons for packet drops that occur within the
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* traffic control (TC) queueing discipline layer. These reasons provide
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* detailed diagnostics about why packets were dropped by various qdisc
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* algorithms, enabling fine-grained monitoring and troubleshooting of
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* queue behavior.
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*/
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enum qdisc_drop_reason {
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/**
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* @QDISC_DROP_UNSPEC: unspecified/invalid qdisc drop reason.
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* Value 0 serves as analogous to SKB_NOT_DROPPED_YET for enum skb_drop_reason.
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* Used for catching zero-initialized drop_reason fields.
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*/
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QDISC_DROP_UNSPEC = 0,
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/**
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* @__QDISC_DROP_REASON: subsystem base value for qdisc drop reasons
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*/
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__QDISC_DROP_REASON = SKB_DROP_REASON_SUBSYS_QDISC <<
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SKB_DROP_REASON_SUBSYS_SHIFT,
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/**
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* @QDISC_DROP_GENERIC: generic/default qdisc drop, used when no
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* more specific reason applies
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*/
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QDISC_DROP_GENERIC,
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/**
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* @QDISC_DROP_OVERLIMIT: packet dropped because the qdisc queue
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* length exceeded its configured limit (sch->limit). This typically
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* indicates the queue is full and cannot accept more packets.
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*/
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QDISC_DROP_OVERLIMIT,
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/**
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* @QDISC_DROP_CONGESTED: packet dropped due to active congestion
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* control algorithms (e.g., CoDel, PIE, RED) detecting network
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* congestion. The qdisc proactively dropped the packet to signal
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* congestion to the sender and prevent bufferbloat.
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*/
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QDISC_DROP_CONGESTED,
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/**
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* @QDISC_DROP_MAXFLOWS: packet dropped because the qdisc's flow
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* tracking table is full and no free slots are available to allocate
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* for a new flow. This indicates flow table exhaustion in flow-based
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* qdiscs that maintain per-flow state (e.g., SFQ).
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*/
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QDISC_DROP_MAXFLOWS,
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/**
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* @QDISC_DROP_FLOOD_PROTECTION: packet dropped by flood protection
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* mechanism detecting unresponsive flows (potential DoS/flood).
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* Used by qdiscs implementing probabilistic drop algorithms like
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* BLUE (e.g., CAKE's Cobalt AQM).
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*/
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QDISC_DROP_FLOOD_PROTECTION,
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/**
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* @QDISC_DROP_BAND_LIMIT: packet dropped because the priority band's
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* limit was reached. Used by qdiscs with priority bands that have
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* per-band packet limits (e.g., FQ).
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*/
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QDISC_DROP_BAND_LIMIT,
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/**
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* @QDISC_DROP_HORIZON_LIMIT: packet dropped because its timestamp
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* is too far in the future (beyond the configured horizon).
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* Used by qdiscs with time-based scheduling (e.g., FQ).
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*/
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QDISC_DROP_HORIZON_LIMIT,
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/**
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* @QDISC_DROP_FLOW_LIMIT: packet dropped because an individual flow
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* exceeded its per-flow packet/depth limit. Used by FQ and SFQ qdiscs
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* to enforce per-flow fairness and prevent a single flow from
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* monopolizing queue resources.
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*/
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QDISC_DROP_FLOW_LIMIT,
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/**
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* @QDISC_DROP_L4S_STEP_NON_ECN: DualPI2 qdisc dropped a non-ECN-capable
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* packet because the L4S queue delay exceeded the step threshold.
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* Since the packet cannot be ECN-marked, it must be dropped to signal
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* congestion. See RFC 9332 for the DualQ Coupled AQM step mechanism.
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*/
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QDISC_DROP_L4S_STEP_NON_ECN,
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/**
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* @QDISC_DROP_MAX: the maximum of qdisc drop reasons, which
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* shouldn't be used as a real 'reason' - only for tracing code gen
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*/
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QDISC_DROP_MAX,
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};
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#undef FN
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#undef FNe
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#endif
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