Kurt Kanzenbach c857946a4e net/core: Enable socket busy polling on -RT ... Busy polling is currently not allowed on PREEMPT_RT, because it disables preemption while invoking the NAPI callback. It is not possible to acquire sleeping locks with disabled preemption. For details see commit 20ab39d13e ("net/core: disable NET_RX_BUSY_POLL on PREEMPT_RT"). However, strict cyclic and/or low latency network applications may prefer busy polling e.g., using AF_XDP instead of interrupt driven communication. The preempt_disable() is used in order to prevent the poll_owner and NAPI owner to be preempted while owning the resource to ensure progress. Netpoll performs busy polling in order to acquire the lock. NAPI is locked by setting the NAPIF_STATE_SCHED flag. There is no busy polling if the flag is set and the "owner" is preempted. Worst case is that the task owning NAPI gets preempted and NAPI processing stalls. This is can be prevented by properly prioritising the tasks within the system. Allow RX_BUSY_POLL on PREEMPT_RT if NETPOLL is disabled. Don't disable preemption on PREEMPT_RT within the busy poll loop. Tested on x86 hardware with v6.1-RT and v6.3-RT on Intel i225 (igc) with AF_XDP/ZC sockets configured to run in busy polling mode. Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>		2023-05-26 08:51:26 +01:00
..
6lowpan	6lowpan: Remove redundant initialisation.	2023-03-29 08:22:52 +01:00
9p	Including fixes from netfilter.	2023-05-05 19:12:01 -07:00
802
8021q	vlan: fix a potential uninit-value in vlan_dev_hard_start_xmit()	2023-05-17 12:55:39 +01:00
appletalk
atm	atm: hide unused procfs functions	2023-05-17 21:27:30 -07:00
ax25
batman-adv	net: vlan: introduce skb_vlan_eth_hdr()	2023-04-23 14:16:44 +01:00
bluetooth	Bluetooth: Unlink CISes when LE disconnects in hci_conn_del	2023-05-19 15:37:45 -07:00
bpf	net: introduce and use skb_frag_fill_page_desc()	2023-05-13 19:47:56 +01:00
bpfilter
bridge	bridge: always declare tunnel functions	2023-05-17 21:28:58 -07:00
caif	net: caif: Fix use-after-free in cfusbl_device_notify()	2023-03-02 22:22:07 -08:00
can	can: j1939: recvmsg(): allow MSG_CMSG_COMPAT flag	2023-05-15 22:24:46 +02:00
ceph	Networking changes for 6.3.	2023-02-21 18:24:12 -08:00
core	net/core: Enable socket busy polling on -RT	2023-05-26 08:51:26 +01:00
dcb	net: dcb: add helper functions to retrieve PCP and DSCP rewrite maps	2023-01-20 09:33:22 +00:00
dccp	netfilter: keep conntrack reference until IPsecv6 policy checks are done	2023-03-22 21:50:23 +01:00
devlink	devlink: pass devlink_port pointer to ops->port_del() instead of index	2023-05-24 10:34:26 +01:00
dns_resolver
dsa	net: dsa: tag_ocelot: call only the relevant portion of __skb_vlan_pop() on TX	2023-04-23 14:16:45 +01:00
ethernet
ethtool	ethtool: Fix uninitialized number of lanes	2023-05-03 09:13:20 +01:00
handshake	net/handshake: Enable the SNI extension to work properly	2023-05-24 22:05:24 -07:00
hsr	hsr: ratelimit only when errors are printed	2023-03-16 21:11:03 -07:00
ieee802154	Revert "net: Remove low_thresh in ip defrag"	2023-05-16 20:46:30 -07:00
ife
ipv4	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2023-05-25 19:57:39 -07:00
ipv6	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2023-05-25 19:57:39 -07:00
iucv	net/iucv: Fix size of interrupt data	2023-03-16 17:34:40 -07:00
kcm	net/sock: Introduce trace_sk_data_ready()	2023-01-23 11:26:50 +00:00
key	af_key: Reject optional tunnel/BEET mode templates in outbound policies	2023-05-10 07:04:51 +02:00
l2tp	l2tp: generate correct module alias strings	2023-03-31 09:25:12 +01:00
l3mdev
lapb
llc	net: deal with most data-races in sk_wait_event()	2023-05-10 10:03:32 +01:00
mac80211	wifi: mac80211: recalc chanctx mindef before assigning	2023-05-16 10:26:00 -07:00
mac802154	mac802154: Rename kfree_rcu() to kvfree_rcu_mightsleep()	2023-04-05 13:48:04 +00:00
mctp	mctp: remove MODULE_LICENSE in non-modules	2023-03-09 23:06:21 -08:00
mpls	net: mpls: fix stale pointer if allocation fails during device rename	2023-02-15 10:26:37 +00:00
mptcp	mptcp: introduces more address related mibs	2023-05-18 20:06:32 -07:00
ncsi	net/ncsi: clear Tx enable mode when handling a Config required AEN	2023-04-28 09:35:33 +01:00
netfilter	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2023-05-18 14:39:34 -07:00
netlabel
netlink	netlink: annotate accesses to nlk->cb_running	2023-05-10 09:28:38 +01:00
netrom	netrom: Fix use-after-free caused by accept on already connected socket	2023-01-30 07:30:47 +00:00
nfc	nfc: llcp: fix possible use of uninitialized variable in nfc_llcp_send_connect()	2023-05-15 13:03:34 +01:00
nsh	net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment()	2023-05-15 08:40:27 +01:00
openvswitch	net: openvswitch: Use struct_size()	2023-05-17 21:25:46 -07:00
packet	net: add vlan_get_protocol_and_depth() helper	2023-05-10 10:25:55 +01:00
phonet	net/sock: Introduce trace_sk_data_ready()	2023-01-23 11:26:50 +00:00
psample
qrtr	net: qrtr: Fix an uninit variable access bug in qrtr_tx_resume()	2023-04-13 09:35:30 +02:00
rds	rds: rds_rm_zerocopy_callback() correct order for list_add_tail()	2023-02-13 09:33:39 +00:00
rfkill	net: rfkill-gpio: Add explicit include for of.h	2023-04-06 20:36:27 +02:00
rose	net/rose: Fix to not accept on connected socket	2023-01-28 00:19:57 -08:00
rxrpc	Including fixes from netfilter.	2023-05-05 19:12:01 -07:00
sched	sch_htb: Allow HTB priority parameter in offload mode	2023-05-15 09:31:07 +01:00
sctp	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2023-05-25 19:57:39 -07:00
smc	net/smc: Reset connection when trying to use SMCRv2 fails.	2023-05-19 08:54:04 +01:00
strparser
sunrpc	NFS Client Bugfixes for Linux 6.4-rc	2023-05-22 12:01:13 -07:00
switchdev
tipc	tipc: check the bearer min mtu properly when setting it by netlink	2023-05-15 10:21:20 +01:00
tls	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2023-05-25 19:57:39 -07:00
unix	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2023-05-25 19:57:39 -07:00
vmw_vsock	bpf, sockmap: Pass skb ownership through read_skb	2023-05-23 16:09:47 +02:00
wireless	wifi: cfg80211: Drop entries with invalid BSSIDs in RNR	2023-05-16 10:09:50 -07:00
x25	net/x25: Fix to not accept on connected socket	2023-01-25 09:51:04 +00:00
xdp	xsk: Use pool->dma_pages to check for DMA	2023-04-27 22:24:51 +02:00
xfrm	espintcp: Inline do_tcp_sendpages()	2023-05-23 20:48:27 -07:00
compat.c	net/compat: Update msg_control_is_user when setting a kernel pointer	2023-04-14 11:09:27 +01:00
devres.c
Kconfig	net/core: Enable socket busy polling on -RT	2023-05-26 08:51:26 +01:00
Kconfig.debug
Makefile	net/handshake: Create a NETLINK service for handling handshake requests	2023-04-19 18:48:48 -07:00
socket.c	net: Declare MSG_SPLICE_PAGES internal sendmsg() flag	2023-05-23 20:48:27 -07:00
sysctl_net.c