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Eric Dumazet ffe4ccd359 net: add net.core.qdisc_max_burst 
In blamed commit, I added a check against the temporary queue
built in __dev_xmit_skb(). Idea was to drop packets early,
before any spinlock was acquired.

if (unlikely(defer_count > READ_ONCE(q->limit))) {
	kfree_skb_reason(skb, SKB_DROP_REASON_QDISC_DROP);
	return NET_XMIT_DROP;
}

It turned out that HTB Qdisc has a zero q->limit.
HTB limits packets on a per-class basis.
Some of our tests became flaky.

Add a new sysctl : net.core.qdisc_max_burst to control
how many packets can be stored in the temporary lockless queue.

Also add a new QDISC_BURST_DROP drop reason to better diagnose
future issues.

Thanks Neal !

Fixes: 100dfa74ca ("net: dev_queue_xmit() llist adoption")
Reported-and-bisected-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Link: https://patch.msgid.link/20260107104159.3669285-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
 		2026-01-13 10:12:11 +01:00
..
6lowpan
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9p - fix a bug with O_APPEND in cached mode causing data to be written multiple times on server 2025-12-07 08:29:09 -08:00
802
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8021q net: vlan: sync VLAN features with lower device 2025-10-31 17:42:35 -07:00
appletalk net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-27 12:19:08 -08:00
ax25 net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-10-31 06:46:03 -07:00
bluetooth Bluetooth: hci_sync: enable PA Sync Lost event 2026-01-09 16:03:57 -05:00
bpf bpf: Do not let BPF test infra emit invalid GSO types to stack 2025-10-20 13:16:10 -07:00
bridge net: bridge: annotate data-races around fdb->{updated,used} 2026-01-09 17:36:21 -08:00
caif caif: fix integer underflow in cffrml_receive() 2025-12-11 01:35:41 -08:00
can can: j1939: make j1939_sk_bind() fail if device is no longer registered 2025-12-17 10:47:33 +01:00
ceph We have a patch that adds an initial set of tracepoints to the MDS 2025-12-14 15:24:10 +12:00
core net: add net.core.qdisc_max_burst 2026-01-13 10:12:11 +01:00
dcb Revert "Documentation: net: add flow control guide and document ethtool API" 2025-10-01 09:48:21 +02:00
devlink tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
dns_resolver net/dns_resolver: use credential guards in dns_query() 2025-11-04 12:36:51 +01:00
dsa net: dsa: fix missing put_device() in dsa_tree_find_first_conduit() 2025-12-23 10:32:08 +01:00
ethernet net: optimize eth_type_trans() vs CONFIG_STACKPROTECTOR_STRONG=y 2025-11-24 19:27:31 -08:00
ethtool ethtool: Avoid overflowing userspace buffer on stats query 2025-12-18 12:24:25 +01:00
handshake net/handshake: Fix null-ptr-deref in handshake_complete() 2025-12-22 12:36:40 +01:00
hsr net/hsr: fix NULL pointer dereference in prp_get_untagged_frame() 2025-12-04 11:15:13 +01:00
ieee802154 net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
ife
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ipv4 ipv4: ip_gre: make ipgre_header() robust 2026-01-10 12:06:22 -08:00
ipv6 ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv() 2026-01-09 18:14:08 -08:00
iucv net: Remove KMSG_COMPONENT macro 2025-11-28 19:20:27 -08:00
kcm Networking changes for 6.19. 2025-12-03 17:24:33 -08:00
key pfkey: Deprecate pfkey 2025-10-30 09:03:12 +01:00
l2tp l2tp: correct debugfs label for tunnel tx stats 2025-12-01 12:03:09 -08:00
l3mdev
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lapb
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llc net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
mac80211 wifi: mac80211: collect station statistics earlier when disconnect 2026-01-08 13:33:11 +01:00
mac802154
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mctp net: mctp: test: move TX packetqueue from dst to dev 2025-12-01 13:52:13 -08:00
mpls mpls: Drop RTNL for RTM_NEWROUTE, RTM_DELROUTE, and RTM_GETROUTE. 2025-11-03 17:40:54 -08:00
mptcp mptcp: ensure context reset on disconnect() 2025-12-23 09:12:25 +01:00
ncsi
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netfilter netfilter: nf_conncount: update last_gc only when GC has been performed 2026-01-02 10:44:28 +01:00
netlabel
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netlink net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
netrom netrom: Fix memory leak in nr_sendmsg() 2025-12-04 11:01:17 +01:00
nfc net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write 2025-12-28 09:15:42 +01:00
nsh
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openvswitch net: openvswitch: Avoid needlessly taking the RTNL on vport destroy 2025-12-22 12:25:11 +01:00
packet net: Convert struct sockaddr to fixed-size "sa_data[14]" 2025-11-04 19:10:33 -08:00
phonet net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
psample
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psp tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
qrtr net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
rds net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
rfkill net: replace use of system_wq with system_percpu_wq 2025-09-22 17:40:30 -07:00
rose net: rose: fix invalid array index in rose_kill_by_device() 2025-12-30 11:45:51 +01:00
rxrpc net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
sched net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset 2026-01-08 08:22:28 -08:00
sctp sctp: Clear inet_opt in sctp_v6_copy_ip_options(). 2025-12-18 16:18:00 +01:00
shaper tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
smc net: smc: SMC_HS_CTRL_BPF should depend on BPF_JIT 2025-12-04 11:07:18 -08:00
strparser Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-13 12:35:38 -08:00
sunrpc nfsd-6.19 fixes: 2025-12-24 09:23:04 -08:00
switchdev
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tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-13 12:35:38 -08:00
tls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-10-31 06:46:03 -07:00
unix net: do not write to msg_get_inq in callee 2026-01-08 08:45:13 -08:00
vmw_vsock vsock: Make accept()ed sockets use custom setsockopt() 2026-01-05 16:14:50 -08:00
wireless wifi: avoid kernel-infoleak from struct iw_point 2026-01-08 13:33:05 +01:00
x25 net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
xdp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-27 12:19:08 -08:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-11-20 09:13:26 -08:00
Kconfig net: Kconfig: discourage drop_monitor enablement 2025-10-17 16:29:26 -07:00
Kconfig.debug
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Makefile psp: base PSP device support 2025-09-18 12:32:06 +02:00
compat.c socket: Unify getsockname and getpeername implementation 2025-11-26 13:45:23 -07:00
devres.c
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socket.c vfs-6.19-rc1.fixes 2025-12-05 15:52:30 -08:00
sysctl_net.c
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