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Sebastian Andrzej Siewior 64445dda9d net: dev: Always serialize on Qdisc::busylock in __dev_xmit_skb() on PREEMPT_RT. 
The root-lock is dropped before dev_hard_start_xmit() is invoked and after
setting the __QDISC___STATE_RUNNING bit. If the Qdisc owner is preempted
by another sender/task with a higher priority then this new sender won't
be able to submit packets to the NIC directly instead they will be
enqueued into the Qdisc. The NIC will remain idle until the Qdisc owner
is scheduled again and finishes the job.

By serializing every task on the ->busylock then the task will be
preempted by a sender only after the Qdisc has no owner.

Always serialize on the busylock on PREEMPT_RT.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-12-13 14:57:03 +00:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-07-22 16:19:03 +02:00
9p 9p: fix a bunch of checkpatch warnings 2021-11-04 21:04:25 +09:00
802 net: 802: Use memset_startat() to clear struct fields 2021-11-19 11:23:23 +00:00
8021q vlan: add net device refcount tracker 2021-12-07 20:44:58 -08:00
appletalk net: socket: rework compat_ifreq_ioctl() 2021-07-23 14:20:25 +01:00
atm net: atm: use address setting helpers 2021-10-24 13:59:45 +01:00
ax25 ax25: add net device refcount tracker 2021-12-07 20:44:59 -08:00
batman-adv Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
bluetooth bluetooth-next pull request for net-next: 2021-11-17 14:52:44 +00:00
bpf bpf: Add dummy BPF STRUCT_OPS for test purpose 2021-11-01 14:10:00 -07:00
bpfilter
bridge net: bridge: add net device refcount tracker 2021-12-07 20:44:58 -08:00
caif net: caif: get ready for const netdev->dev_addr 2021-10-24 13:59:45 +01:00
can can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM_BAM 2021-11-06 17:29:32 +01:00
ceph libceph, ceph: move ceph_osdc_copy_from() into cephfs code 2021-11-08 03:29:52 +01:00
core net: dev: Always serialize on Qdisc::busylock in __dev_xmit_skb() on PREEMPT_RT. 2021-12-13 14:57:03 +00:00
dcb
dccp dccp: Inline dccp_listen_start(). 2021-11-23 20:16:22 -08:00
decnet net: Remove redundant if statements 2021-08-05 13:27:50 +01:00
dns_resolver
dsa net: dsa: tag_sja1105: split sja1105_tagger_data into private and public sections 2021-12-12 12:51:34 +00:00
ethernet gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 2021-11-24 17:21:42 -08:00
ethtool Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-09 13:23:02 -08:00
hsr net: Write lock dev_base_lock without disabling bottom halves. 2021-11-29 12:12:36 +00:00
ieee802154 net: drop nopreempt requirement on sock_prot_inuse_add() 2021-11-16 13:20:45 +00:00
ife
ipv4 Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-10 15:56:13 -08:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-09 13:23:02 -08:00
iucv net/af_iucv: Use struct_group() to zero struct iucv_sock region 2021-11-19 11:52:25 +00:00
kcm
key
l2tp l2tp: add netns refcount tracker to l2tp_dfs_seq_data 2021-12-10 06:38:27 -08:00
l3mdev
lapb
llc sock: Use sock_owned_by_user_nocheck() instead of sk_lock.owned. 2021-12-10 19:43:00 -08:00
mac80211 ethtool: extend ringparam setting/getting API with rx_buf_len 2021-11-22 12:31:49 +00:00
mac802154 mac802154: use dev_addr_set() - manual 2021-10-20 14:27:40 +01:00
mctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-02 11:44:56 -08:00
mpls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-02 11:44:56 -08:00
mptcp mptcp: support TCP_CORK and TCP_NODELAY 2021-12-07 11:36:31 -08:00
ncsi net/ncsi : Add payload to be 32-bit aligned to fix dropped packets 2021-11-24 11:53:17 +00:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-09 13:23:02 -08:00
netlabel net: fix NULL pointer reference in cipso_v4_doi_free 2021-08-30 12:23:18 +01:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-02 11:44:56 -08:00
netrom ax25: constify dev_addr passing 2021-10-13 09:40:45 -07:00
nfc nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done 2021-12-09 07:50:32 -08:00
nsh
openvswitch openvswitch: add net device refcount tracker to struct vport 2021-12-07 20:45:00 -08:00
packet net: drop nopreempt requirement on sock_prot_inuse_add() 2021-11-16 13:20:45 +00:00
phonet net: Remove redundant if statements 2021-08-05 13:27:50 +01:00
psample
qrtr net: qrtr: combine nameservice into main module 2021-09-28 17:36:43 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-02 11:44:56 -08:00
rfkill
rose rose: constify dev_addr passing 2021-10-13 09:40:45 -07:00
rxrpc rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() 2021-11-29 15:40:02 +00:00
sched Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-09 13:23:02 -08:00
sctp sctp: make the raise timer more simple and accurate 2021-11-25 21:00:45 -08:00
smc net/smc: add net device tracker to struct smc_pnetentry 2021-12-07 20:44:59 -08:00
strparser bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding 2021-11-09 01:05:28 +01:00
sunrpc NFS client bugfixes for Linux 5.16 2021-11-27 10:33:55 -08:00
switchdev net: switchdev: add net device refcount tracker 2021-12-07 20:44:58 -08:00
tipc tipc: discard MSG_CRYPTO msgs when key_exchange_enabled is not set 2021-12-13 12:31:36 +00:00
tls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-02 11:44:56 -08:00
unix net: Enable max_dgram_qlen unix sysctl to be configurable by non-init user namespaces 2021-12-13 12:47:47 +00:00
vmw_vsock hv_sock: Extract hvs_send_data() helper that takes only header 2021-12-07 21:49:19 -08:00
wireless nl80211: fix radio statistics in survey dump 2021-11-15 10:51:51 +01:00
x25 net: x25: drop harmless check of !more 2021-12-09 18:35:11 -08:00
xdp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-11-18 13:13:16 -08:00
xfrm xfrm: add net device refcount tracker to struct xfrm_state_offload 2021-12-10 08:16:33 -08:00
compat.c
devres.c
Kconfig net: kunit: add a test for dev_addr_lists 2021-11-20 12:25:57 +00:00
Kconfig.debug net: add networking namespace refcount tracker 2021-12-10 06:38:26 -08:00
Makefile mctp: Add MCTP base 2021-07-29 15:06:49 +01:00
socket.c Core: 2021-08-31 16:43:06 -07:00
sysctl_net.c sections: move and rename core_kernel_data() to is_kernel_core_data() 2021-11-09 10:02:50 -08:00