linux/include/net
Kuniyuki Iwashima fc1f97929a bonding: Optimise is_netpoll_tx_blocked().
bond_start_xmit() spends some cycles in is_netpoll_tx_blocked():

  if (unlikely(is_netpoll_tx_blocked(dev)))
      return NETDEV_TX_BUSY;

because of the "pushf;pop reg" sequence (aka irqs_disabled()).

Let's swap the conditions in is_netpoll_tx_blocked() and
convert netpoll_block_tx to a static key.

Before:

   1.23 │       mov    %gs:0x28,%rax
   1.24 │       mov    %rax,0x18(%rsp)
  29.45 │       pushfq
   0.50 │       pop    %rax
   0.47 │       test   $0x200,%eax
        │     ↓ je     1b4
   0.49 │ 32:   lea    0x980(%rsi),%rbx

After:

   0.72 │       mov    %gs:0x28,%rax
   0.81 │       mov    %rax,0x18(%rsp)
   0.82 │       nop
   2.77 │ 2a:   lea    0x980(%rsi),%rbx

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260223230749.2376145-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-02-24 18:13:38 -08:00
..
9p
bluetooth Bluetooth: L2CAP: Fix not tracking outstanding TX ident 2026-01-29 13:36:35 -05:00
caif
iucv net/iucv: clean up iucv kernel-doc warnings 2026-02-04 20:39:58 -08:00
libeth
mana RDMA v7.0 merge window 2026-02-12 17:05:20 -08:00
netfilter netfilter pull request nf-next-26-02-06 2026-02-10 20:25:38 -08:00
netns inet: move icmp_global_{credit,stamp} to a separate cache line 2026-02-18 16:46:36 -08:00
nfc nfc: nci: Fix race between rfkill and nci_unregister_device(). 2026-01-28 19:32:26 -08:00
page_pool Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'" 2026-01-20 18:06:01 -08:00
phonet
phy net: phy: realtek: add dummy PHY driver for RTL8127ATF 2026-01-12 19:29:11 -08:00
psp
sctp
tc_act
6lowpan.h
Space.h
act_api.h
addrconf.h ipv6: addrconf: reduce default temp_valid_lft to 2 days 2026-02-17 17:12:06 -08:00
af_ieee802154.h
af_rxrpc.h
af_unix.h
af_vsock.h vsock: add netns to vsock core 2026-01-27 10:45:38 +01:00
ah.h
aligned_data.h
amt.h
arp.h
atmclip.h
ax25.h Summary 2026-02-18 10:45:36 -08:00
ax88796.h
bareudp.h
bond_3ad.h
bond_alb.h
bond_options.h
bonding.h bonding: Optimise is_netpoll_tx_blocked(). 2026-02-24 18:13:38 -08:00
bpf_sk_storage.h
busy_poll.h
calipso.h
can.h can: add CAN skb extension infrastructure 2026-02-05 11:58:39 +01:00
cfg80211-wext.h
cfg80211.h wifi: cfg80211: add initial UHR support 2026-02-02 10:11:07 +01:00
cfg802154.h
checksum.h
cipso_ipv4.h
cls_cgroup.h
codel.h
codel_impl.h
codel_qdisc.h
compat.h
datalink.h
dcbevent.h
dcbnl.h
devlink.h
dropreason-core.h net: add net.core.qdisc_max_burst 2026-01-13 10:12:11 +01:00
dropreason.h
dsa.h net: dsa: add tag format for MxL862xx switches 2026-02-11 11:27:57 +01:00
dsa_stubs.h
dscp.h
dsfield.h
dst.h inet: add dst4_mtu() and dst6_mtu() helpers 2026-02-02 17:49:29 -08:00
dst_cache.h
dst_metadata.h
dst_ops.h
eee.h
erspan.h
esp.h
espintcp.h
ethoc.h
failover.h
fib_notifier.h
fib_rules.h
firewire.h
flow.h
flow_dissector.h
flow_offload.h net: dsa: eliminate local type for tc policers 2026-02-10 15:30:11 +01:00
fou.h
fq.h
fq_impl.h
garp.h
gen_stats.h
genetlink.h
geneve.h
gre.h
gro.h gro: inline tcp6_gro_complete() 2026-01-21 19:28:32 -08:00
gro_cells.h
gso.h
gtp.h
gue.h
handshake.h
hotdata.h net: add net.core.qdisc_max_burst 2026-01-13 10:12:11 +01:00
hwbm.h
icmp.h
ieee8021q.h
ieee80211_radiotap.h
ieee802154_netdev.h
if_inet6.h
ife.h
inet6_connection_sock.h tcp: move inet6_csk_update_pmtu() to tcp_ipv6.c 2026-02-24 17:47:27 -08:00
inet6_hashtables.h
inet_common.h
inet_connection_sock.h tcp: make tcp_v{4,6}_send_check() static 2026-02-24 17:16:09 -08:00
inet_dscp.h
inet_ecn.h tcp: ECT_1_NEGOTIATION and NEEDS_ACCECN identifiers 2026-02-03 15:13:24 +01:00
inet_frag.h
inet_hashtables.h
inet_sock.h ipv6: colocate inet6_cork in inet_cork_full 2026-02-02 17:49:30 -08:00
inet_timewait_sock.h
inetpeer.h
ioam6.h ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data() 2026-02-13 12:24:05 -08:00
ip.h
ip6_checksum.h udp: move udp6_csum_init() back to net/ipv6/udp.c 2026-02-24 16:30:40 -08:00
ip6_fib.h
ip6_route.h inet: add dst4_mtu() and dst6_mtu() helpers 2026-02-02 17:49:29 -08:00
ip6_tunnel.h
ip_fib.h
ip_tunnels.h ipv4: ip_tunnel: spread netdev_lockdep_set_classes() 2026-01-08 18:02:35 -08:00
ip_vs.h
ipcomp.h
ipconfig.h
ipv6.h ipv6: fix a race in ip6_sock_set_v6only() 2026-02-17 16:45:29 -08:00
ipv6_frag.h
ipv6_stubs.h
iw_handler.h
kcm.h
l3mdev.h net: l3mdev: use skb_dst_dev_rcu() in l3mdev_l3_out() 2026-02-02 17:09:11 -08:00
lag.h
lapb.h
llc.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h
llc_if.h
llc_pdu.h
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
lwtunnel.h
mac80211.h wifi: mac80211: Add eMLSR/eMLMR action frame parsing support 2026-02-02 10:11:18 +01:00
mac802154.h
macsec.h
mctp.h
mctpdevice.h
mip6.h
mld.h
mpls.h
mpls_iptunnel.h
mptcp.h
mrp.h
ncsi.h
ndisc.h
neighbour.h
neighbour_tables.h
net_debug.h
net_failover.h
net_namespace.h netns: optimize netns cleaning by batching unhash_nsid calls 2026-02-06 20:01:31 -08:00
net_ratelimit.h
net_shaper.h
net_trackers.h
netdev_lock.h
netdev_netlink.h
netdev_queues.h net: add queue config validation callback 2026-01-23 11:49:02 -08:00
netdev_rx_queue.h Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'" 2026-01-20 18:06:01 -08:00
netevent.h
netkit.h
netlabel.h
netlink.h
netmem.h net: inline get_netmem() and put_netmem() 2026-01-25 13:18:53 -08:00
netprio_cgroup.h
netrom.h
nexthop.h
nl802154.h
nsh.h
pfcp.h
pie.h
ping.h
pkt_cls.h
pkt_sched.h net/sched: don't use dynamic lockdep keys with clsact/ingress/noqueue 2026-02-05 09:32:45 -08:00
pptp.h
proto_memory.h
protocol.h
psample.h
psnap.h
psp.h
raw.h
rawv6.h
red.h
regulatory.h
request_sock.h tcp: move __reqsk_free() out of line 2026-02-05 09:23:06 -08:00
rose.h
route.h
rpl.h
rps.h
rsi_91x.h
rstreason.h
rtnetlink.h
rtnh.h
sch_generic.h
sch_priv.h net/sched: Export mq functions for reuse 2026-01-13 11:54:29 +01:00
scm.h
secure_seq.h
seg6.h
seg6_hmac.h
seg6_local.h
selftests.h
slhc_vj.h
smc.h
snmp.h
sock.h net: __lock_sock() can be static 2026-02-24 16:30:33 -08:00
sock_reuseport.h
stp.h
strparser.h
switchdev.h
tc_wrapper.h
tcp.h tcp: make tcp_v{4,6}_send_check() static 2026-02-24 17:16:09 -08:00
tcp_ao.h
tcp_ecn.h tcp: accecn: add tcpi_ecn_mode and tcpi_option2 in tcp_info 2026-02-03 15:13:25 +01:00
tcp_states.h
tcx.h
timewait_sock.h
tipc.h
tls.h
tls_prot.h
tls_toe.h
transp_v6.h
tso.h
tun_proto.h
udp.h udp: udplite is unlikely 2026-01-06 17:06:03 -08:00
udp_tunnel.h geneve: expose gso partial features for tunnel offload 2026-01-23 11:31:14 -08:00
udplite.h
vsock_addr.h
vxlan.h
wext.h
x25.h
x25device.h
xdp.h
xdp_priv.h
xdp_sock.h
xdp_sock_drv.h Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'" 2026-01-20 18:06:01 -08:00
xfrm.h xfrm: reduce struct sec_path size 2026-02-10 20:21:48 -08:00
xsk_buff_pool.h xsk: move cq_cached_prod_lock to avoid touching a cacheline in sending path 2026-01-15 10:07:45 +01:00