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Sean Anderson 0c3e10cb44 net: phy: Add support for rate matching 
This adds support for rate matching (also known as rate adaptation) to
the phy subsystem. The general idea is that the phy interface runs at
one speed, and the MAC throttles the rate at which it sends packets to
the link speed. There's a good overview of several techniques for
achieving this at [1]. This patch adds support for three: pause-frame
based (such as in Aquantia phys), CRS-based (such as in 10PASS-TS and
2BASE-TL), and open-loop-based (such as in 10GBASE-W).

This patch makes a few assumptions and a few non assumptions about the
types of rate matching available. First, it assumes that different phys
may use different forms of rate matching. Second, it assumes that phys
can use rate matching for any of their supported link speeds (e.g. if a
phy supports 10BASE-T and XGMII, then it can adapt XGMII to 10BASE-T).
Third, it does not assume that all interface modes will use the same
form of rate matching. Fourth, it does not assume that all phy devices
will support rate matching (even if some do). Relaxing or strengthening
these (non-)assumptions could result in a different API. For example, if
all interface modes were assumed to use the same form of rate matching,
then a bitmask of interface modes supportting rate matching would
suffice.

For some better visibility into the process, the current rate matching
mode is exposed as part of the ethtool ksettings. For the moment, only
read access is supported. I'm not sure what userspace might want to
configure yet (disable it altogether, disable just one mode, specify the
mode to use, etc.). For the moment, since only pause-based rate
adaptation support is added in the next few commits, rate matching can
be disabled altogether by adjusting the advertisement.

802.3 calls this feature "rate adaptation" in clause 49 (10GBASE-R) and
"rate matching" in clause 61 (10PASS-TL and 2BASE-TS). Aquantia also calls
this feature "rate adaptation". I chose "rate matching" because it is
shorter, and because Russell doesn't think "adaptation" is correct in this
context.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-09-23 11:55:35 +01:00
..
caif tty: cumulate and document tty_struct::flow* members 2021-05-13 16:57:16 +02:00
device_drivers docs: networking: device drivers: flexcan: fix invalid email 2022-09-06 08:32:12 +02:00
devlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-09-01 12:58:02 -07:00
dsa docs: net: dsa: update information about multiple CPU ports 2022-09-20 10:32:36 +02:00
mac80211_hwsim
6lowpan.rst
6pack.rst docs: networking: convert 6pack.txt to ReST 2020-04-28 14:38:38 -07:00
af_xdp.rst doc, af_xdp: Fix bind flags option typo 2021-07-12 16:55:01 +02:00
alias.rst
arcnet-hardware.rst docs: networking: arcnet-hardware.rst: don't duplicate chapter names 2020-05-01 12:24:43 -07:00
arcnet.rst Documentation: networking: arcnet: drop doubled word 2020-07-04 17:46:21 -07:00
atm.rst docs: networking: convert atm.txt to ReST 2020-04-28 14:38:38 -07:00
ax25.rst Documentation: networking: ax25: drop doubled word 2020-07-04 17:46:21 -07:00
bareudp.rst Documentation: bareudp: Corrected description of bareudp module. 2020-07-28 17:53:03 -07:00
batman-adv.rst batman-adv: Move IRC channel to hackint.org 2021-08-08 20:05:46 +02:00
bonding.rst Documentation: bonding: clarify supported modes for tlb_dynamic_lb 2022-08-30 23:17:54 -07:00
bridge.rst
can_ucan_protocol.rst Documentation: networking: can_ucan_protocol: drop doubled words 2020-07-04 17:46:21 -07:00
can.rst can: Break loopback loop on loopback documentation 2022-06-11 22:40:13 +02:00
cdc_mbim.rst docs: networking: convert cdc_mbim.txt to ReST 2020-04-28 14:38:39 -07:00
checksum-offloads.rst docs: networking: convert netdev-features.txt to ReST 2020-04-30 12:56:36 -07:00
dccp.rst net: dccp: Add SIOCOUTQ IOCTL support (send buffer fill) 2020-07-22 17:00:37 -07:00
dctcp.rst docs: networking: convert dctcp.txt to ReST 2020-04-28 14:38:39 -07:00
dns_resolver.rst docs: networking: convert dns_resolver.txt to ReST 2020-04-28 14:39:46 -07:00
driver.rst Documentation: networking: correct possessive "its" 2022-08-31 12:36:08 -07:00
eql.rst docs: networking: convert eql.txt to ReST 2020-04-28 14:39:46 -07:00
ethtool-netlink.rst net: phy: Add support for rate matching 2022-09-23 11:55:35 +01:00
failover.rst
fib_trie.rst docs: networking: convert fib_trie.txt to ReST 2020-04-28 14:39:46 -07:00
filter.rst bpf, docs: Split general purpose eBPF documentation out of filter.rst 2021-11-30 10:52:11 -08:00
gen_stats.rst docs: networking: convert gen_stats.txt to ReST 2020-04-28 14:39:46 -07:00
generic_netlink.rst docs: networking: convert generic_netlink.txt to ReST 2020-04-28 14:39:46 -07:00
generic-hdlc.rst docs: networking: convert generic-hdlc.txt to ReST 2020-04-28 14:39:46 -07:00
gtp.rst docs: networking: convert gtp.txt to ReST 2020-04-28 14:39:46 -07:00
ieee802154.rst docs: net: ieee802154.rst: fix C expressions 2020-10-15 07:49:41 +02:00
ila.rst docs: networking: convert ila.txt to ReST 2020-04-28 14:39:47 -07:00
index.rst docs: net: add an explanation of VF (and other) Representors 2022-09-21 07:31:38 -07:00
ioam6-sysctl.rst ipv6: ioam: Documentation for new IOAM sysctls 2021-07-21 08:14:33 -07:00
ip_dynaddr.rst docs: networking: convert ip_dynaddr.txt to ReST 2020-04-28 14:39:47 -07:00
ip-sysctl.rst tcp: Introduce optional per-netns ehash. 2022-09-20 10:21:50 -07:00
ipddp.rst docs: networking: convert ipddp.txt to ReST 2020-04-28 14:39:47 -07:00
ipsec.rst docs: networking: convert ipsec.txt to ReST 2020-04-28 14:39:47 -07:00
ipv6.rst docs: networking: convert ipv6.txt to ReST 2020-04-28 14:40:18 -07:00
ipvlan.rst Documentation: networking: correct possessive "its" 2022-08-31 12:36:08 -07:00
ipvs-sysctl.rst netfilter: ipvs: Fix reuse connection if RS weight is 0 2021-11-08 11:42:47 +01:00
j1939.rst can: j1939: add tables for the CAN identifier and its fields 2020-11-20 09:43:29 +01:00
kapi.rst wimax: move out to staging 2020-10-29 19:27:45 +01:00
kcm.rst docs: networking: convert kcm.txt to ReST 2020-04-28 14:40:19 -07:00
l2tp.rst Documentation: networking: correct possessive "its" 2022-08-31 12:36:08 -07:00
lapb-module.rst docs: networking: convert lapb-module.txt to ReST 2020-04-30 12:56:35 -07:00
mac80211-auth-assoc-deauth.txt
mac80211-injection.rst doc: networking: wireless: fix wiki website url 2020-06-08 10:05:53 +02:00
mctp.rst mctp: Add SIOCMCTP{ALLOC,DROP}TAG ioctls for tag control 2022-02-09 12:00:11 +00:00
mpls-sysctl.rst docs: networking: convert mpls-sysctl.txt to ReST 2020-04-30 12:56:36 -07:00
mptcp-sysctl.rst Documentation: mptcp: fix pm_type formatting 2022-09-13 10:18:44 +02:00
msg_zerocopy.rst docs: use the lore redirector everywhere 2021-10-12 13:58:19 -06:00
multiqueue.rst docs: networking: convert multiqueue.txt to ReST 2020-04-30 12:56:36 -07:00
net_dim.rst docs: networking: add full DIM API 2020-04-10 18:11:04 -07:00
net_failover.rst Documentation: networking: net_failover: Fix documentation 2021-11-17 13:59:49 +00:00
netconsole.rst docs: networking: convert netconsole.txt to ReST 2020-04-30 12:56:36 -07:00
netdev-features.rst net: hsr: add offloading support 2021-02-11 13:24:44 -08:00
netdevices.rst net: bonding: move ioctl handling to private ndo operation 2021-07-27 20:11:45 +01:00
netfilter-sysctl.rst docs: networking: convert netfilter-sysctl.txt to ReST 2020-04-30 12:56:36 -07:00
netif-msg.rst docs: networking: convert netif-msg.txt to ReST 2020-04-30 12:56:36 -07:00
nexthop-group-resilient.rst Documentation: net: Document resilient next-hop groups 2021-03-29 13:51:38 -07:00
nf_conntrack-sysctl.rst netfilter: conntrack: remove nf_conntrack_helper documentation 2022-09-20 23:50:03 +02:00
nf_flowtable.rst docs: nf_flowtable: fix compilation and warnings 2021-03-25 17:42:02 -07:00
nfc.rst
openvswitch.rst docs: networking: convert openvswitch.txt to ReST 2020-04-30 12:56:36 -07:00
operstates.rst docs: operstates: document IF_OPER_TESTING 2021-08-02 15:16:04 +01:00
packet_mmap.rst docs: networking: Replace strncpy() with strscpy() 2021-06-04 11:21:43 -06:00
page_pool.rst Documentation: update networking/page_pool.rst 2022-03-03 09:55:28 +00:00
phonet.rst docs: networking: convert phonet.txt to ReST 2020-04-30 12:56:37 -07:00
phy.rst net: phy: Add 1000BASE-KX interface mode 2022-09-05 14:30:42 +01:00
pktgen.rst pktgen: document the latest pktgen usage options 2021-08-25 13:44:30 +01:00
plip.rst docs: networking: convert PLIP.txt to ReST 2020-04-30 12:56:37 -07:00
ppp_generic.rst docs: update ppp_generic.rst to document new ioctls 2020-12-10 13:57:36 -08:00
proc_net_tcp.rst docs: networking: convert proc_net_tcp.txt to ReST 2020-04-30 12:56:37 -07:00
radiotap-headers.rst docs: networking: convert radiotap-headers.txt to ReST 2020-04-30 12:56:37 -07:00
rds.rst Doc: networking: Fix the title's Sphinx overline in rds.rst 2021-11-29 15:18:21 -07:00
regulatory.rst doc: networking: wireless: fix wiki website url 2020-06-08 10:05:53 +02:00
representors.rst docs: net: add an explanation of VF (and other) Representors 2022-09-21 07:31:38 -07:00
rxrpc.rst rxrpc: Remove rxrpc_get_reply_time() which is no longer used 2022-09-01 11:44:13 +01:00
scaling.rst docs: networking: update XPS to account for netif_set_xps_queue 2020-10-13 16:21:54 -07:00
sctp.rst docs: networking: convert sctp.txt to ReST 2020-04-30 12:56:38 -07:00
secid.rst docs: networking: convert secid.txt to ReST 2020-04-30 12:56:38 -07:00
seg6-sysctl.rst doc: move seg6_flowlabel to seg6-sysctl.rst 2021-04-14 13:13:15 -07:00
segmentation-offloads.rst
sfp-phylink.rst doc: sfp-phylink: Fix a broken reference 2022-08-02 21:45:07 -07:00
skbuff.rst skbuff: render the checksum comment to documentation 2022-05-10 17:48:37 -07:00
smc-sysctl.rst net/smc: Unbind r/w buffer size from clcsock and make them tunable 2022-09-22 12:58:21 +02:00
snmp_counter.rst net-next: docs: Fix typos in snmp_counter.rst 2021-01-05 17:07:38 -08:00
statistics.rst docs: networking: extend the statistics documentation 2021-04-16 16:59:20 -07:00
strparser.rst docs: networking: convert strparser.txt to ReST 2020-04-30 12:56:38 -07:00
switchdev.rst docs: net: add an explanation of VF (and other) Representors 2022-09-21 07:31:38 -07:00
sysfs-tagging.rst Documentation: better locations for sysfs-pci, sysfs-tagging 2020-10-09 09:33:23 -06:00
tc-actions-env-rules.rst docs: networking: convert tc-actions-env-rules.txt to ReST 2020-04-30 12:56:38 -07:00
tcp-thin.rst docs: networking: convert tcp-thin.txt to ReST 2020-04-30 12:56:38 -07:00
team.rst docs: networking: convert team.txt to ReST 2020-04-30 12:56:38 -07:00
timestamping.rst docs: networking: Use netif_rx(). 2022-03-04 12:02:19 +00:00
tipc.rst Documentation: add more details in tipc.rst 2021-07-01 13:18:18 -07:00
tls-offload-layers.svg
tls-offload-reorder-bad.svg
tls-offload-reorder-good.svg
tls-offload.rst net: Disable NETIF_F_HW_TLS_RX when RXCSUM is disabled 2021-01-19 15:58:05 -08:00
tls.rst tls: rx: add counter for NoPad violations 2022-07-11 19:48:33 -07:00
tproxy.rst docs: networking: convert tproxy.txt to ReST 2020-04-30 12:56:38 -07:00
tuntap.rst docs: networking: Replace strncpy() with strscpy() 2021-06-04 11:21:43 -06:00
udplite.rst docs: networking: convert udplite.txt to ReST 2020-05-01 12:24:40 -07:00
vrf.rst doc: Document unexpected tcp_l3mdev_accept=1 behavior 2021-08-23 11:53:24 +01:00
vxlan.rst docs: vxlan: add info about device features 2020-09-28 12:50:12 -07:00
x25-iface.rst net: x25: Queue received packets in the drivers instead of per-CPU queues 2021-04-05 11:42:12 -07:00
x25.rst net: x25: Remove unimplemented X.25-over-LLC code stubs 2020-12-12 17:15:33 -08:00
xfrm_device.rst docs: networking: Fix a typo 2021-03-20 19:02:42 -07:00
xfrm_proc.rst docs: networking: convert xfrm_proc.txt to ReST 2020-05-01 12:24:40 -07:00
xfrm_sync.rst docs: networking: convert xfrm_sync.txt to ReST 2020-05-01 12:24:41 -07:00
xfrm_sysctl.rst docs: networking: convert xfrm_sysctl.txt to ReST 2020-05-01 12:24:41 -07:00