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Vladimir Oltean 2f530df76c net/sched: taprio: give higher priority to higher TCs in software dequeue mode 
Current taprio software implementation is haunted by the shadow of the
igb/igc hardware model. It iterates over child qdiscs in increasing
order of TXQ index, therefore giving higher xmit priority to TXQ 0 and
lower to TXQ N. According to discussions with Vinicius, that is the
default (perhaps even unchangeable) prioritization scheme used for the
NICs that taprio was first written for (igb, igc), and we have a case of
two bugs canceling out, resulting in a functional setup on igb/igc, but
a less sane one on other NICs.

To the best of my understanding, taprio should prioritize based on the
traffic class, so it should really dequeue starting with the highest
traffic class and going down from there. We get to the TXQ using the
tc_to_txq[] netdev property.

TXQs within the same TC have the same (strict) priority, so we should
pick from them as fairly as we can. We can achieve that by implementing
something very similar to q->curband from multiq_dequeue().

Since igb/igc really do have TXQ 0 of higher hardware priority than
TXQ 1 etc, we need to preserve the behavior for them as well. We really
have no choice, because in txtime-assist mode, taprio is essentially a
software scheduler towards offloaded child tc-etf qdiscs, so the TXQ
selection really does matter (not all igb TXQs support ETF/SO_TXTIME,
says Kurt Kanzenbach).

To preserve the behavior, we need a capability bit so that taprio can
determine if it's running on igb/igc, or on something else. Because igb
doesn't offload taprio at all, we can't piggyback on the
qdisc_offload_query_caps() call from taprio_enable_offload(), but
instead we need a separate call which is also made for software
scheduling.

Introduce two static keys to minimize the performance penalty on systems
which only have igb/igc NICs, and on systems which only have other NICs.
For mixed systems, taprio will have to dynamically check whether to
dequeue using one prioritization algorithm or using the other.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2023-02-08 09:48:52 +00:00
..
9p net/9p: distinguish zero-copy requests 2022-12-06 07:30:55 +09:00
bluetooth Bluetooth: Add quirk to disable MWS Transport Configuration 2022-12-12 14:19:24 -08:00
caif net: remove the caif_hsi driver 2021-07-01 13:19:48 -07:00
iucv net/af_iucv: Use struct_group() to zero struct iucv_sock region 2021-11-19 11:52:25 +00:00
mana net: mana: Fix IRQ name - add PCI and queue number 2023-01-20 18:17:17 -08:00
netfilter netfilter: flowtable: cache info of last offload 2023-02-03 09:31:24 +00:00
netns net: xsk: Don't include <linux/rculist.h> 2022-12-06 20:04:34 -08:00
nfc NFC: add NCI_UNREG flag to eliminate the race 2021-11-17 20:17:05 -08:00
phonet net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
sctp sctp: delete free member from struct sctp_sched_ops 2022-12-01 20:14:23 -08:00
tc_act net/sched: transition act_pedit to rcu and percpu stats 2023-02-02 13:19:02 +01:00
6lowpan.h
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Space.h wan: remove sbni/granch driver 2021-08-03 13:05:26 +01:00
act_api.h net/sched: move struct action_ops definition out of ifdef 2022-12-09 09:18:07 +00:00
addrconf.h ipv6/addrconf: fix a null-ptr-deref bug for ip6_ptr 2022-07-28 10:42:44 -07:00
af_ieee802154.h
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af_rxrpc.h rxrpc: Tidy up abort generation infrastructure 2023-01-06 09:43:32 +00:00
af_unix.h af_unix: Remove unix_table_locks. 2022-06-22 12:59:43 +01:00
af_vsock.h vsock: add API call for data ready 2022-08-23 10:43:11 +02:00
ah.h
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amt.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
arp.h ipv4: Invalidate neighbour for broadcast address upon address addition 2022-02-21 11:44:30 +00:00
atmclip.h
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ax25.h ax25: fix incorrect dev_tracker usage 2022-07-28 22:06:15 -07:00
ax88796.h ax88796: Fix some typo in a comment 2022-08-09 22:14:02 -07:00
bareudp.h bareudp: Move definition of struct bareudp_conf to bareudp.c 2021-12-13 12:34:09 +00:00
bond_3ad.h net: bonding: Share lacpdu_mcast_addr definition 2022-09-16 14:34:01 +01:00
bond_alb.h bonding (gcc13): synchronize bond_{a,t}lb_xmit() types 2022-11-02 20:38:13 -07:00
bond_options.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
bonding.h bond: Disable TLS features indication 2022-10-27 12:45:38 +02:00
bpf_sk_storage.h bpf: struct sock is declared twice in bpf_sk_storage header 2021-03-26 17:43:55 +01:00
busy_poll.h net: Fix a data-race around sysctl_net_busy_poll. 2022-08-24 13:46:58 +01:00
calipso.h
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cfg80211-wext.h wifi: cfg80211: Avoid clashing function prototypes 2022-11-16 11:31:47 +02:00
cfg80211.h wifi: cfg80211: Use MLD address to indicate MLD STA disconnection 2023-01-18 17:31:50 +01:00
cfg802154.h ieee802154: Advertize coordinators discovery 2022-11-29 15:34:22 +01:00
checksum.h net: checksum: drop the linux/uaccess.h include 2023-01-27 11:19:46 +00:00
cipso_ipv4.h
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cls_cgroup.h
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codel.h codel: remove unnecessary pkt_sched.h include 2021-12-22 15:03:51 -08:00
codel_impl.h codel: remove unnecessary sock.h include 2021-12-22 15:03:47 -08:00
codel_qdisc.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
compat.h net: copy from user before calling __get_compat_msghdr 2022-07-24 18:39:17 -06:00
datalink.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
dcbevent.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
dcbnl.h net: dcb: add helper functions to retrieve PCP and DSCP rewrite maps 2023-01-20 09:33:22 +00:00
devlink.h devlink: remove devlink features 2023-01-30 08:37:46 +00:00
dropreason.h tcp: add TCP_MINTTL drop reason 2023-02-02 21:14:50 -08:00
dsa.h net: dsa: add plumbing for changing and getting MAC merge layer state 2023-01-23 12:44:18 +00:00
dsfield.h
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dst.h net: add atomic_long_t to net_device_stats fields 2022-11-16 12:48:44 +00:00
dst_cache.h wireguard: device: reset peer src endpoint when netns exits 2021-11-29 19:50:45 -08:00
dst_metadata.h xfrm: interface: Add unstable helpers for setting/getting XFRM metadata from TC-BPF 2022-12-05 21:58:27 -08:00
dst_ops.h ipv6: remove max_size check inline with ipv4 2023-01-13 20:59:14 -08:00
erspan.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
esp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
espintcp.h
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ethoc.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
failover.h net: failover: add net device refcount tracker 2021-12-06 16:06:02 -08:00
fib_notifier.h
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fib_rules.h fib: expand fib_rule_policy 2021-12-16 07:18:35 -08:00
firewire.h firewire: net: Make use of get_unaligned_be48(), put_unaligned_be48() 2022-07-28 22:21:54 -07:00
flow.h net: remove unnecessary includes from net/flow.h 2023-01-27 11:19:46 +00:00
flow_dissector.h flow_dissector: Add L2TPv3 dissectors 2022-09-20 09:13:38 +02:00
flow_offload.h net: flow_offload: add support for ARP frame matching 2022-11-14 11:24:16 +00:00
fou.h
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fq.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
fq_impl.h wifi: mac80211: add support for restricting netdev features per vif 2022-12-01 15:09:10 +01:00
garp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
gen_stats.h net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
genetlink.h mptcp: more detailed error reporting on endpoint creation 2022-11-21 13:09:07 +00:00
geneve.h net: geneve: fix array of flexible structures warnings 2022-10-31 10:43:04 +00:00
gre.h ip_gre: add csum offload support for gre header 2021-01-29 20:39:14 -08:00
gro.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-08-25 16:07:42 -07:00
gro_cells.h
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gtp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
gue.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
hwbm.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
icmp.h ipv6: ICMPV6: add response to ICMPV6 RFC 8335 PROBE messages 2021-06-28 14:29:45 -07:00
ieee80211_radiotap.h ieee80211: radiotap: fix -Wcast-qual warnings 2022-02-04 16:25:21 +01:00
ieee802154_netdev.h Merge tag 'ieee802154-for-net-next-2022-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next 2022-10-26 15:24:36 +01:00
if_inet6.h ipv6: fix locking issues with loops over idev->addr_list 2022-04-06 22:09:39 -07:00
ife.h
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ila.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
inet6_connection_sock.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
inet6_hashtables.h net: allow unbound socket for packets in VRF when tcp_l3mdev_accept set 2022-07-29 11:58:54 +01:00
inet_common.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
inet_connection_sock.h net: Add a bhash2 table hashed by port and address 2022-08-24 19:30:07 -07:00
inet_dscp.h ipv6: Define dscp_t and stop taking ECN bits into account in fib6-rules 2022-02-07 20:12:45 -08:00
inet_ecn.h net: add skb_get_dsfield() helper 2021-10-15 11:33:08 +01:00
inet_frag.h net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT 2022-10-31 20:14:27 -07:00
inet_hashtables.h tcp: Add TIME_WAIT sockets in bhash2. 2022-12-30 07:25:52 +00:00
inet_sock.h inet: Add IP_LOCAL_PORT_RANGE socket option 2023-01-25 22:45:00 -08:00
inet_timewait_sock.h tcp: Add TIME_WAIT sockets in bhash2. 2022-12-30 07:25:52 +00:00
inetpeer.h
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ioam6.h treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00
ip.h inet: Add IP_LOCAL_PORT_RANGE socket option 2023-01-25 22:45:00 -08:00
ip6_checksum.h net: move gro definitions to include/net/gro.h 2021-11-16 13:16:54 +00:00
ip6_fib.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
ip6_route.h ipv6: Make ip6_route_output_flags_noref() static. 2023-01-24 18:12:52 -08:00
ip6_tunnel.h ip_gre, ip6_gre: Fix race condition on o_seqno in collect_md mode 2022-04-25 11:40:45 +01:00
ip_fib.h ipv4: Use dscp_t in struct fib_entry_notifier_info 2022-04-11 17:37:50 -07:00
ip_tunnels.h net: Add helper function to parse netlink msg of ip_tunnel_parm 2022-10-03 07:59:06 +01:00
ip_vs.h ipvs: run_estimation should control the kthread tasks 2022-12-10 22:44:43 +01:00
ipcomp.h xfrm: ipcomp: add extack to ipcomp{4,6}_init_state 2022-09-29 07:18:00 +02:00
ipconfig.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
ipv6.h IPv6/GRO: generic helper to remove temporary HBH/jumbo header in driver 2022-12-12 15:41:44 -08:00
ipv6_frag.h net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT 2022-10-31 20:14:27 -07:00
ipv6_stubs.h bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt() 2022-09-02 20:34:32 -07:00
iw_handler.h
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kcm.h
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l3mdev.h
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lag.h
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lapb.h net: lapb: Make "lapb_t1timer_running" able to detect an already running timer 2021-03-23 14:14:50 -07:00
lib80211.h
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llc.h llc: fix out-of-bound array index in llc_sk_dev_hash() 2021-11-07 19:25:29 +00:00
llc_c_ac.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_c_ev.h
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llc_c_st.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_conn.h llc: add net device refcount tracker 2021-12-07 20:44:59 -08:00
llc_if.h llc/snap: constify dev_addr passing 2021-10-13 09:40:46 -07:00
llc_pdu.h net: llc: fix skb_over_panic 2021-07-27 13:05:56 +01:00
llc_s_ac.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_s_ev.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_s_st.h add missing includes and forward declarations to networking includes under linux/ 2022-07-28 11:29:36 +02:00
llc_sap.h
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lwtunnel.h netfilter: add netfilter hooks to SRv6 data plane 2021-08-30 01:51:36 +02:00
mac80211.h wifi: mac80211: drop extra 'e' from ieeee80211... name 2023-01-19 14:57:51 +01:00
mac802154.h mac802154: Drop IEEE802154_HW_RX_DROP_BAD_CKSUM 2022-10-12 12:57:19 +02:00
macsec.h net: macsec: remove the prepare flag from the MACsec offloading context 2022-09-23 06:56:08 -07:00
mctp.h mctp: Use output netdev to allocate skb headroom 2022-04-01 12:04:15 +01:00
mctpdevice.h mctp: Pass flow data & flow release events to drivers 2021-10-29 13:23:51 +01:00
mip6.h
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mld.h mld: add new workqueues for process mld events 2021-03-26 15:14:56 -07:00
mpls.h
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mpls_iptunnel.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
mptcp.h mptcp: remove MPTCP 'ifdef' in TCP SYN cookies 2022-12-12 13:11:24 -08:00
mrp.h mrp: introduce active flags to prevent UAF when applicant uninit 2022-11-18 12:14:55 +00:00
ncsi.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
ndisc.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-03-03 11:55:12 -08:00
neighbour.h net: neigh: decrement the family specific qlen 2022-11-18 10:29:50 +00:00
net_debug.h net: add CONFIG_DEBUG_NET 2022-05-11 12:43:10 +01:00
net_failover.h
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net_namespace.h net: add a refcount tracker for kernel sockets 2022-10-24 11:04:43 +01:00
net_ratelimit.h
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net_trackers.h net: add networking namespace refcount tracker 2021-12-10 06:38:26 -08:00
netevent.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
netlabel.h
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netlink.h net: netlink: recommend policy range validation 2023-01-28 00:33:51 -08:00
netprio_cgroup.h
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netrom.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
nexthop.h net: ipv4: Fix rtnexthop len when RTA_FLOW is present 2021-09-24 14:07:10 +01:00
nl802154.h ieee802154: Advertize coordinators discovery 2022-11-29 15:34:22 +01:00
nsh.h
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p8022.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
page_pool.h net: page_pool: use in_softirq() instead 2023-02-06 09:15:22 +00:00
pie.h
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ping.h inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
pkt_cls.h net/sched: move struct tc_mqprio_qopt_offload from pkt_cls.h to pkt_sched.h 2023-02-06 10:06:43 +00:00
pkt_sched.h net/sched: taprio: give higher priority to higher TCs in software dequeue mode 2023-02-08 09:48:52 +00:00
pptp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
protocol.h tcp/udp: Make early_demux back namespacified. 2022-07-15 18:50:35 -07:00
psample.h psample: Add a fwd declaration for skbuff 2021-08-09 15:34:21 -07:00
psnap.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
raw.h raw: use net_hash_mix() in hash function 2023-02-03 19:56:23 -08:00
rawv6.h raw: convert raw sockets to RCU 2022-06-19 10:00:02 +01:00
red.h treewide: use get_random_u32() when possible 2022-10-11 17:42:58 -06:00
regulatory.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
request_sock.h tcp: Use BPF timeout setting for SYN ACK RTO 2022-02-02 14:45:18 +00:00
rose.h net: rose: add netdev ref tracker to 'struct rose_sock' 2022-08-01 11:59:23 -07:00
route.h net: add a couple of helpers for iph tot_len 2023-02-01 20:54:27 -08:00
rpl.h
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rsi_91x.h
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rtnetlink.h rtnetlink: Honour NLM_F_ECHO flag in rtnl_delete_link 2022-10-31 18:10:21 -07:00
rtnh.h
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sch_generic.h net/sched: sch_taprio: fix possible use-after-free 2023-01-16 13:25:34 +00:00
scm.h
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secure_seq.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
seg6.h udp6: Use Segment Routing Header for dest address if present 2022-01-04 12:17:35 +00:00
seg6_hmac.h
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seg6_local.h
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selftests.h net: selftest: fix build issue if INET is disabled 2021-04-28 14:06:45 -07:00
slhc_vj.h
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smc.h net/smc: De-tangle ism and smc device initialization 2023-01-25 09:46:49 +00:00
snmp.h
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sock.h net: add sock_init_data_uid() 2023-02-06 10:16:55 +00:00
sock_reuseport.h soreuseport: Fix socket selection for SO_INCOMING_CPU. 2022-10-25 11:35:16 +02:00
stp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
strparser.h tls: rx: remove the message decrypted tracking 2022-07-18 11:24:10 +01:00
switchdev.h bridge: switchdev: Allow device drivers to install locked FDB entries 2022-11-09 19:06:13 -08:00
tc_wrapper.h net/sched: fix retpoline wrapper compilation on configs without tc filters 2022-12-28 12:11:32 +00:00
tcp.h bpf-next-for-netdev 2022-12-12 11:27:42 -08:00
tcp_states.h
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timewait_sock.h
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tipc.h
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tls.h net/tls: Describe ciphers sizes by const structs 2022-09-22 17:27:41 -07:00
tls_toe.h
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transp_v6.h inet6: Remove inet6_destroy_sock(). 2022-10-24 09:40:39 +01:00
tso.h net: tso: inline tso_count_descs() 2022-12-12 15:04:39 -08:00
tun_proto.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
udp.h udp: track the forward memory release threshold in an hot cacheline 2022-10-24 10:52:50 +01:00
udp_tunnel.h net: Change the udp encap_err_rcv to allow use of {ip,ipv6}_icmp_error() 2022-11-08 16:42:28 +00:00
udplite.h tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct(). 2022-10-12 17:50:37 -07:00
vsock_addr.h
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vxlan.h drivers: vxlan: vnifilter: per vni stats 2022-03-01 08:38:02 +00:00
wext.h
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x25.h
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x25device.h
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xdp.h bpf: XDP metadata RX kfuncs 2023-01-23 09:38:11 -08:00
xdp_priv.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
xdp_sock.h net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
xdp_sock_drv.h xsk: Remove unused xsk_buff_discard 2022-09-30 07:55:46 -07:00
xfrm.h bpf-next-for-netdev 2022-12-12 11:27:42 -08:00
xsk_buff_pool.h xsk: Add cb area to struct xdp_buff_xsk 2023-01-23 09:58:23 -08:00