linux-2.6-microblaze.git
3 years agodrivers: net: vxlan.c: Fix declaration issue
Sanjana Srinidhi [Sat, 13 Mar 2021 08:36:49 +0000 (14:06 +0530)]
drivers: net: vxlan.c: Fix declaration issue

Added a blank line after structure declaration.
This is done to maintain code uniformity.

Signed-off-by: Sanjana Srinidhi <sanjanasrinidhi1810@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: ethernet: marvell: Fixed typo in the file sky2.c
Bhaskar Chowdhury [Sat, 13 Mar 2021 05:45:36 +0000 (11:15 +0530)]
net: ethernet: marvell: Fixed typo in the file sky2.c

s/calclation/calculation/

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'dsa-hewllcreek-dumps'
David S. Miller [Sat, 13 Mar 2021 22:30:48 +0000 (14:30 -0800)]
Merge branch 'dsa-hewllcreek-dumps'

Kurt Kanzenbach says:

====================
net: dsa: hellcreek: Add support for dumping tables

add support for dumping the VLAN and FDB table via devlink. As the driver uses
internal VLANs and static FDB entries, this is a useful debugging feature.

Changes since v1:

 * Drop memory reporting as there are better APIs to expose this
 * Move comment to VLAN patch

Previous versions:

 * https://lkml.kernel.org/netdev/20210311175344.3084-1-kurt@kmk-computers.de/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: dsa: hellcreek: Add devlink FDB region
Kurt Kanzenbach [Sat, 13 Mar 2021 09:39:39 +0000 (10:39 +0100)]
net: dsa: hellcreek: Add devlink FDB region

Allow to dump the FDB table via devlink. This is a useful debugging feature.

Signed-off-by: Kurt Kanzenbach <kurt@kmk-computers.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: dsa: hellcreek: Move common code to helper
Kurt Kanzenbach [Sat, 13 Mar 2021 09:39:38 +0000 (10:39 +0100)]
net: dsa: hellcreek: Move common code to helper

There are two functions which need to populate fdb entries. Move that to a
helper function.

Signed-off-by: Kurt Kanzenbach <kurt@kmk-computers.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: dsa: hellcreek: Use boolean value
Kurt Kanzenbach [Sat, 13 Mar 2021 09:39:37 +0000 (10:39 +0100)]
net: dsa: hellcreek: Use boolean value

hellcreek_select_vlan() takes a boolean instead of an integer.
So, use false accordingly.

Signed-off-by: Kurt Kanzenbach <kurt@kmk-computers.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: dsa: hellcreek: Add devlink VLAN region
Kurt Kanzenbach [Sat, 13 Mar 2021 09:39:36 +0000 (10:39 +0100)]
net: dsa: hellcreek: Add devlink VLAN region

Allow to dump the VLAN table via devlink. This especially useful, because the
driver internally leverages VLANs for the port separation. These are not visible
via the bridge utility.

Signed-off-by: Kurt Kanzenbach <kurt@kmk-computers.de>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge tag 'batadv-next-pullrequest-20210312' of git://git.open-mesh.org/linux-merge
David S. Miller [Sat, 13 Mar 2021 22:27:56 +0000 (14:27 -0800)]
Merge tag 'batadv-next-pullrequest-20210312' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
There is only a single patch this time:

 - Use netif_rx_any_context(), by Sebastian Andrzej Siewior
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'pps-policing'
David S. Miller [Sat, 13 Mar 2021 22:18:10 +0000 (14:18 -0800)]
Merge branch 'pps-policing'

Simon Horman says:

====================
net/sched: act_police: add support for packet-per-second policing

This series enhances the TC policer action implementation to allow a
policer action instance to enforce a rate-limit based on
packets-per-second, configurable using a packet-per-second rate and burst
parameters.

In the hope of aiding review this is broken up into three patches.

* [PATCH 1/3] flow_offload: add support for packet-per-second policing

  Add support for this feature to the flow_offload API that is used to allow
  programming flows, including TC rules and their actions, into hardware.

* [PATCH 2/3] flow_offload: reject configuration of packet-per-second policing in offload drivers

  Teach all exiting users of the flow_offload API that allow offload of
  policer action instances to reject offload if packet-per-second rate
  limiting is configured: none support it at this time

* [PATCH 3/3] net/sched: act_police: add support for packet-per-second policing

  With the above ground-work in place add the new feature to the TC policer
  action itself

With the above in place the feature may be used.

As follow-ups we plan to provide:
* Corresponding updates to iproute2
* Corresponding self tests (which depend on the iproute2 changes)
* Hardware offload support for the NFP driver

Key changes since v2:
* Added patches 1 and 2, which makes adding patch 3 safe for existing
  hardware offload of the policer action
* Re-worked patch 3 so that a TC policer action instance may be configured
  for packet-per-second or byte-per-second rate limiting, but not both.
* Corrected kdoc usage
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet/sched: act_police: add support for packet-per-second policing
Baowen Zheng [Fri, 12 Mar 2021 14:08:31 +0000 (15:08 +0100)]
net/sched: act_police: add support for packet-per-second policing

Allow a policer action to enforce a rate-limit based on packets-per-second,
configurable using a packet-per-second rate and burst parameters.

e.g.
tc filter add dev tap1 parent ffff: u32 match \
        u32 0 0 police pkts_rate 3000 pkts_burst 1000

Testing was unable to uncover a performance impact of this change on
existing features.

Signed-off-by: Baowen Zheng <baowen.zheng@corigine.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Louis Peens <louis.peens@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoflow_offload: reject configuration of packet-per-second policing in offload drivers
Baowen Zheng [Fri, 12 Mar 2021 14:08:30 +0000 (15:08 +0100)]
flow_offload: reject configuration of packet-per-second policing in offload drivers

A follow-up patch will allow users to configures packet-per-second policing
in the software datapath. In preparation for this, teach all drivers that
support offload of the policer action to reject such configuration as
currently none of them support it.

Signed-off-by: Baowen Zheng <baowen.zheng@corigine.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Louis Peens <louis.peens@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoflow_offload: add support for packet-per-second policing
Xingfeng Hu [Fri, 12 Mar 2021 14:08:29 +0000 (15:08 +0100)]
flow_offload: add support for packet-per-second policing

Allow flow_offload API to configure packet-per-second policing using rate
and burst parameters.

Dummy implementations of tcf_police_rate_pkt_ps() and
tcf_police_burst_pkt() are supplied which return 0, the unconfigured state.
This is to facilitate splitting the offload, driver, and TC code portion of
this feature into separate patches with the aim of providing a logical flow
for review. And the implementation of these helpers will be filled out by a
follow-up patch.

Signed-off-by: Xingfeng Hu <xingfeng.hu@corigine.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Louis Peens <louis.peens@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'hns3-imp-phys'
David S. Miller [Sat, 13 Mar 2021 22:11:29 +0000 (14:11 -0800)]
Merge branch 'hns3-imp-phys'

Huazhong Tan says:

====================
net: hns3: support imp-controlled PHYs

This series adds support for imp-controlled PHYs in the HNS3
ethernet driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: hns3: add phy loopback support for imp-controlled PHYs
Guangbin Huang [Fri, 12 Mar 2021 08:50:16 +0000 (16:50 +0800)]
net: hns3: add phy loopback support for imp-controlled PHYs

If the imp-controlled PHYs feature is enabled, driver can not
call phy driver interface to set loopback anymore and needs
to send command to firmware to start phy loopback.

Driver reuses the existing firmware command 0x0315 to start
phy loopback, just add a setting bit in this command. As this
command is not only for serdes loopback anymore, rename this
command to "xxx_COMMON_LOOPBACK", and modify function name,
macro name and logs related to it.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: hns3: add ioctl support for imp-controlled PHYs
Guangbin Huang [Fri, 12 Mar 2021 08:50:15 +0000 (16:50 +0800)]
net: hns3: add ioctl support for imp-controlled PHYs

When the imp-controlled PHYs feature is enabled, driver will not
register mdio bus. In order to support ioctl ops for phy tool to
read or write phy register in this case, the firmware implement
a new command for driver and driver implement ioctl by using this
new command.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: hns3: add get/set pause parameters support for imp-controlled PHYs
Guangbin Huang [Fri, 12 Mar 2021 08:50:14 +0000 (16:50 +0800)]
net: hns3: add get/set pause parameters support for imp-controlled PHYs

When the imp-controlled PHYs feature is enabled, phydev is NULL.
In this case, the autoneg is always off when user uses ethtool -a
command to get pause parameters because  hclge_get_pauseparam()
uses phydev to check whether device is TP port. To fit this new
feature, use media type to check whether device is TP port.

And when user set pause parameters, these parameters need to
always set to mac, no matter whether autoneg is off.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: hns3: add support for imp-controlled PHYs
Guangbin Huang [Fri, 12 Mar 2021 08:50:13 +0000 (16:50 +0800)]
net: hns3: add support for imp-controlled PHYs

IMP(Intelligent Management Processor) firmware add a new feature
to take control of PHYs for some new devices, PF driver adds
support for this feature.

Driver queries device's capability to check whether IMP supports
this feature, it will tell IMP to enable this feature by firmware
compatible command if it is supported.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'sh_eth-reg-defs'
David S. Miller [Sat, 13 Mar 2021 01:50:42 +0000 (17:50 -0800)]
Merge branch 'sh_eth-reg-defs'

Sergey Shtylyov says:

====================
sh_eth: Improve the register/bit definitions in the Ether driver

Here are 4 patches against DaveM's 'net-next' repo. Mainly I'm renaming the register *enum*
tags/entries to match the SoC manuals,and also moving the RX-TX descriptor *enum*s closer to
the corresponding *struct*s...
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agosh_eth: place RX/TX descriptor *enum*s after their *struct*s
Sergey Shtylyov [Fri, 12 Mar 2021 20:47:02 +0000 (23:47 +0300)]
sh_eth: place RX/TX descriptor *enum*s after their *struct*s

Place the RX/TX descriptor bit *enum*s where they belong -- after the
corresponding RX/TX descriptor *struct*s and, while at it, switch to
declaring one *enum* entry per line...

Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agosh_eth: rename *enum*s still not matching register names
Sergey Shtylyov [Fri, 12 Mar 2021 20:45:48 +0000 (23:45 +0300)]
sh_eth: rename *enum*s still not matching register names

Finally, rename the rest of the *enum* tags still not (exactly) matching
the abbreviated register names from the manuals...

Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agosh_eth: rename PSR bits
Sergey Shtylyov [Fri, 12 Mar 2021 20:44:53 +0000 (23:44 +0300)]
sh_eth: rename PSR bits

In all the SoC manuals (except R-Car gen2) the PHY status register's name
is abbreviated to  PSR with the only valid bit 0 named LMON.  Follow the
suit and rename the corresponding *enum* tag/entry.

Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agosh_eth: rename TRSCER bits
Sergey Shtylyov [Fri, 12 Mar 2021 20:43:46 +0000 (23:43 +0300)]
sh_eth: rename TRSCER bits

In all the SoC manuals the TRSCER register bits match the corresponding
EESR registers's bits, but only on the R-Car gen2 SoC those are named
RINT<n> and TINT<n>.  Follow the suit and rename the *enum* tag/entries
from DESC_I_* to TRSCER_*.

Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'mptcp-Include-multiple-address-ids-in-RM_ADDR'
David S. Miller [Sat, 13 Mar 2021 01:47:46 +0000 (17:47 -0800)]
Merge branch 'mptcp-Include-multiple-address-ids-in-RM_ADDR'

Mat Martineau says:

====================
mptcp: Include multiple address ids in RM_ADDR

Here's a patch series from the MPTCP tree that extends the capabilities
of the MPTCP RM_ADDR header.

MPTCP peers can exchange information about their IP addresses that are
available for additional MPTCP subflows. IP addresses are advertised
with an ADD_ADDR header type, and those advertisements are revoked with
the RM_ADDR header type. RFC 8684 allows the RM_ADDR header to include
more than one address ID, so multiple advertisements can be revoked in a
single header. Previous kernel versions have only used RM_ADDR with a
single address ID, so multiple removals required multiple packets.

Patches 1-4 plumb address id list structures around the MPTCP code,
where before only a single address ID was passed.

Patches 5-8 make use of the address lists at the path manager layer that
tracks available addresses for both peers.

Patches 9-11 update the selftests to cover the new use of RM_ADDR with
multiple address IDs.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: mptcp: add testcases for removing addrs
Geliang Tang [Sat, 13 Mar 2021 01:16:21 +0000 (17:16 -0800)]
selftests: mptcp: add testcases for removing addrs

This patch added the testcases for removing a list of addresses. Used
the netlink to flush the addresses in the testcases.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: mptcp: set addr id for removing testcases
Geliang Tang [Sat, 13 Mar 2021 01:16:20 +0000 (17:16 -0800)]
selftests: mptcp: set addr id for removing testcases

The removing testcases can only delete the addresses from id 1, this
patch added the support for deleting the addresses from any id that user
set.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: mptcp: add invert argument for chk_rm_nr
Geliang Tang [Sat, 13 Mar 2021 01:16:19 +0000 (17:16 -0800)]
selftests: mptcp: add invert argument for chk_rm_nr

Some of the removing testcases used two zeros as arguments for chk_rm_nr
like this: chk_rm_nr 0 0. This doesn't mean that no RM_ADDR has been sent.
It only means that RM_ADDR had been sent in the opposite direction that
chk_rm_nr is checking.

This patch added a new argument invert for chk_rm_nr to allow it can
check the RM_ADDR from the opposite direction.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: remove a list of addrs when flushing
Geliang Tang [Sat, 13 Mar 2021 01:16:18 +0000 (17:16 -0800)]
mptcp: remove a list of addrs when flushing

This patch invoked mptcp_nl_remove_addrs_list to remove a list of addresses
when the netlink flushes addresses, instead of using
mptcp_nl_remove_subflow_and_signal_addr to remove them one by one.

And dropped the unused parameter net in __flush_addrs too.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: remove multi addresses and subflows in PM
Geliang Tang [Sat, 13 Mar 2021 01:16:17 +0000 (17:16 -0800)]
mptcp: remove multi addresses and subflows in PM

This patch implemented the function to remove a list of addresses and
subflows, named mptcp_nl_remove_addrs_list, which had a input parameter
rm_list as the removing addresses list.

In mptcp_nl_remove_addrs_list, traverse all the existing msk sockets to
invoke mptcp_pm_remove_addrs_and_subflows to remove a list of addresses
for each msk socket.

In mptcp_pm_remove_addrs_and_subflows, traverse all the addresses in the
removing addresses list, to find whether this address is in the conn_list
or anno_list. If it is, put the address ID into the removing address list
or the removing subflow list, and pass the two lists to
mptcp_pm_remove_addr and mptcp_pm_remove_subflow.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: remove multi subflows in PM
Geliang Tang [Sat, 13 Mar 2021 01:16:16 +0000 (17:16 -0800)]
mptcp: remove multi subflows in PM

This patch dealt with removing multi subflows in PM:

In mptcp_pm_remove_subflow, changed the input parameter local_id as an
list of removing address ids, and passed the list to
mptcp_pm_nl_rm_subflow_received.

In mptcp_pm_nl_rm_subflow_received, iterated each address id from the
received ids list. Then shut down and closed each address id's subsocket.

In mptcp_nl_remove_subflow_and_signal_addr, put the single address id into
an ids list, and passed it to mptcp_pm_remove_subflow.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: remove multi addresses in PM
Geliang Tang [Sat, 13 Mar 2021 01:16:15 +0000 (17:16 -0800)]
mptcp: remove multi addresses in PM

This patch dropped the member rm_id of struct mptcp_pm_data. Use
rm_list_rx in mptcp_pm_nl_rm_addr_received instead of using rm_id.

In mptcp_pm_nl_rm_addr_received, iterated each address id from
pm.rm_list_rx, then shut down and closed each address id's subsocket.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: add rm_list_rx in mptcp_pm_data
Geliang Tang [Sat, 13 Mar 2021 01:16:14 +0000 (17:16 -0800)]
mptcp: add rm_list_rx in mptcp_pm_data

This patch added a new member rm_list_rx for struct mptcp_pm_data as an
list of the removing address ids on the incoming direction. Initialized
its nr field to zero in mptcp_pm_data_init.

In mptcp_pm_rm_addr_received, set it as the input rm_list.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: add rm_list in mptcp_options_received
Geliang Tang [Sat, 13 Mar 2021 01:16:13 +0000 (17:16 -0800)]
mptcp: add rm_list in mptcp_options_received

This patch changed the member rm_id in struct mptcp_options_received as a
list of the removing address ids, and renamed it to rm_list.

In mptcp_parse_option, parsed the RM_ADDR suboption and filled them into
the rm_list in struct mptcp_options_received.

In mptcp_incoming_options, passed this rm_list to the function
mptcp_pm_rm_addr_received.

It also changed the parameter type of mptcp_pm_rm_addr_received.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: add rm_list_tx in mptcp_pm_data
Geliang Tang [Sat, 13 Mar 2021 01:16:12 +0000 (17:16 -0800)]
mptcp: add rm_list_tx in mptcp_pm_data

This patch added a new member rm_list_tx for struct mptcp_pm_data as the
removing address list on the outgoing direction. Initialize its nr field
to zero in mptcp_pm_data_init.

In mptcp_pm_remove_anno_addr, put the single address id into an removing
list, and passed it to mptcp_pm_remove_addr.

In mptcp_pm_remove_addr, save the input rm_list to rm_list_tx in struct
mptcp_pm_data.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomptcp: add rm_list in mptcp_out_options
Geliang Tang [Sat, 13 Mar 2021 01:16:11 +0000 (17:16 -0800)]
mptcp: add rm_list in mptcp_out_options

This patch defined a new struct mptcp_rm_list, the ids field was an
array of the removing address ids, the nr field was the valid number of
removing address ids in the array. The array size was definced as a new
macro MPTCP_RM_IDS_MAX. Changed the member rm_id of struct
mptcp_out_options to rm_list.

In mptcp_established_options_rm_addr, invoked mptcp_pm_rm_addr_signal to
get the rm_list. According the number of addresses in it, calculated
the padded RM_ADDR suboption length. And saved the ids array in struct
mptcp_out_options's rm_list member.

In mptcp_write_options, iterated each address id from struct
mptcp_out_options's rm_list member, set the invalid ones as TCPOPT_NOP,
then filled them into the RM_ADDR suboption.

Changed TCPOLEN_MPTCP_RM_ADDR_BASE from 4 to 3.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'resil-nhgroups-netdevsim-selftests'
David S. Miller [Sat, 13 Mar 2021 01:44:10 +0000 (17:44 -0800)]
Merge branch 'resil-nhgroups-netdevsim-selftests'

Petr Machata says:

====================
net: Resilient NH groups: netdevsim, selftests

Support for resilient next-hop groups was added in a previous patch set.
Resilient next hop groups add a layer of indirection between the SKB hash
and the next hop. Thus the hash is used to reference a hash table bucket,
which is then used to reference a particular next hop. This allows the
system more flexibility when assigning SKB hash space to next hops.
Previously, each next hop had to be assigned a continuous range of SKB hash
space. With a hash table as an intermediate layer, it is possible to
reassign next hops with a hash table bucket granularity. In turn, this
mends issues with traffic flow redirection resulting from next hop removal
or adjustments in next-hop weights.

This patch set introduces mock offloading of resilient next hop groups by
the netdevsim driver, and a suite of selftests.

- Patch #1 adds a netdevsim-specific lock to protect next-hop hashtable.
  Previously, netdevsim relied on RTNL to maintain mutual exclusion.
  Patch #2 extracts a helper to make the following patches clearer.

- Patch #3 implements the support for offloading of resilient next-hop
  groups.

- Patch #4 introduces a new debugfs interface to set activity on a selected
  next-hop bucket. This simulates how HW can periodically report bucket
  activity, and buckets thus marked are expected to be exempt from
  migration to new next hops when the group changes.

- Patches #5 and #6 clean up the fib_nexthop selftests.

- Patches #7, #8 and #9 add tests for resilient next hop groups. Patch #7
  adds resilient-hashing counterparts to fib_nexthops.sh. Patch #8 adds a
  new traffic test for resilient next-hop groups. Patch #9 adds a new
  traffic test for tunneling.

- Patch #10 actually leverages the netdevsim offload to implement a suite
  of algorithmic tests that verify how and when buckets are migrated under
  various simulated workload scenarios.

The overall plan is to contribute approximately the following patchsets:

1) Nexthop policy refactoring (already pushed)
2) Preparations for resilient next hop groups (already pushed)
3) Implementation of resilient next hop group (already pushed)
4) Netdevsim offload plus a suite of selftests (this patchset)
5) Preparations for mlxsw offload of resilient next-hop groups
6) mlxsw offload including selftests

Interested parties can look at the complete code at [2].

[1] https://tools.ietf.org/html/rfc2992
[2] https://github.com/idosch/linux/commits/submit/res_integ_v1
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: netdevsim: Add test for resilient nexthop groups offload API
Ido Schimmel [Fri, 12 Mar 2021 16:50:26 +0000 (17:50 +0100)]
selftests: netdevsim: Add test for resilient nexthop groups offload API

Test various aspects of the resilient nexthop group offload API on top
of the netdevsim implementation. Both good and bad flows are tested.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Co-developed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: forwarding: Add resilient multipath tunneling nexthop test
Ido Schimmel [Fri, 12 Mar 2021 16:50:25 +0000 (17:50 +0100)]
selftests: forwarding: Add resilient multipath tunneling nexthop test

Add a resilient nexthop objects version of gre_multipath_nh.sh. Test
that both IPv4 and IPv6 overlays work with resilient nexthop groups
where the nexthops are two GRE tunnels.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: forwarding: Add resilient hashing test
Ido Schimmel [Fri, 12 Mar 2021 16:50:24 +0000 (17:50 +0100)]
selftests: forwarding: Add resilient hashing test

Verify that IPv4 and IPv6 multipath forwarding works correctly with
resilient nexthop groups and with different weights.

Test that when the idle timer is not zero, the resilient groups are not
rebalanced - because the nexthop buckets are considered active - and the
initial weights (1:1) are used.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: fib_nexthops: Test resilient nexthop groups
Ido Schimmel [Fri, 12 Mar 2021 16:50:23 +0000 (17:50 +0100)]
selftests: fib_nexthops: Test resilient nexthop groups

Add test cases for resilient nexthop groups. Exhaustive forwarding tests
are added separately under net/forwarding/.

Examples:

 # ./fib_nexthops.sh -t basic_res

Basic resilient nexthop group functional tests
----------------------------------------------
TEST: Add a nexthop group with default parameters                   [ OK ]
TEST: Get a nexthop group with default parameters                   [ OK ]
TEST: Get a nexthop group with non-default parameters               [ OK ]
TEST: Add a nexthop group with 0 buckets                            [ OK ]
TEST: Replace nexthop group parameters                              [ OK ]
TEST: Get a nexthop group after replacing parameters                [ OK ]
TEST: Replace idle timer                                            [ OK ]
TEST: Get a nexthop group after replacing idle timer                [ OK ]
TEST: Replace unbalanced timer                                      [ OK ]
TEST: Get a nexthop group after replacing unbalanced timer          [ OK ]
TEST: Replace with no parameters                                    [ OK ]
TEST: Get a nexthop group after replacing no parameters             [ OK ]
TEST: Replace nexthop group type - implicit                         [ OK ]
TEST: Replace nexthop group type - explicit                         [ OK ]
TEST: Replace number of nexthop buckets                             [ OK ]
TEST: Get a nexthop group after replacing with invalid parameters   [ OK ]
TEST: Dump all nexthop buckets                                      [ OK ]
TEST: Dump all nexthop buckets in a group                           [ OK ]
TEST: Dump all nexthop buckets with a specific nexthop device       [ OK ]
TEST: Dump all nexthop buckets with a specific nexthop identifier   [ OK ]
TEST: Dump all nexthop buckets in a non-existent group              [ OK ]
TEST: Dump all nexthop buckets in a non-resilient group             [ OK ]
TEST: Dump all nexthop buckets using a non-existent device          [ OK ]
TEST: Dump all nexthop buckets with invalid 'groups' keyword        [ OK ]
TEST: Dump all nexthop buckets with invalid 'fdb' keyword           [ OK ]
TEST: Get a valid nexthop bucket                                    [ OK ]
TEST: Get a nexthop bucket with valid group, but invalid index      [ OK ]
TEST: Get a nexthop bucket from a non-resilient group               [ OK ]
TEST: Get a nexthop bucket from a non-existent group                [ OK ]

Tests passed:  29
Tests failed:   0

 # ./fib_nexthops.sh -t ipv4_large_res_grp

IPv4 large resilient group (128k buckets)
-----------------------------------------
TEST: Dump large (x131072) nexthop buckets                          [ OK ]

Tests passed:   1
Tests failed:   0

 # ./fib_nexthops.sh -t ipv6_large_res_grp

IPv6 large resilient group (128k buckets)
-----------------------------------------
TEST: Dump large (x131072) nexthop buckets                          [ OK ]

Tests passed:   1
Tests failed:   0

 # ./fib_nexthops.sh -t ipv4_res_torture

IPv4 runtime resilient nexthop group torture
--------------------------------------------
TEST: IPv4 resilient nexthop group torture test                     [ OK ]

Tests passed:   1
Tests failed:   0

 # ./fib_nexthops.sh -t ipv6_res_torture

IPv6 runtime resilient nexthop group torture
--------------------------------------------
TEST: IPv6 resilient nexthop group torture test                     [ OK ]

Tests passed:   1
Tests failed:   0

 # ./fib_nexthops.sh -t ipv4_res_grp_fcnal

IPv4 resilient groups functional
--------------------------------
TEST: Nexthop group updated when entry is deleted                   [ OK ]
TEST: Nexthop buckets updated when entry is deleted                 [ OK ]
TEST: Nexthop group updated after replace                           [ OK ]
TEST: Nexthop buckets updated after replace                         [ OK ]
TEST: Nexthop group updated when entry is deleted - nECMP           [ OK ]
TEST: Nexthop buckets updated when entry is deleted - nECMP         [ OK ]
TEST: Nexthop group updated after replace - nECMP                   [ OK ]
TEST: Nexthop buckets updated after replace - nECMP                 [ OK ]

Tests passed:   8
Tests failed:   0

 # ./fib_nexthops.sh -t ipv6_res_grp_fcnal

IPv6 resilient groups functional
--------------------------------
TEST: Nexthop group updated when entry is deleted                   [ OK ]
TEST: Nexthop buckets updated when entry is deleted                 [ OK ]
TEST: Nexthop group updated after replace                           [ OK ]
TEST: Nexthop buckets updated after replace                         [ OK ]
TEST: Nexthop group updated when entry is deleted - nECMP           [ OK ]
TEST: Nexthop buckets updated when entry is deleted - nECMP         [ OK ]
TEST: Nexthop group updated after replace - nECMP                   [ OK ]
TEST: Nexthop buckets updated after replace - nECMP                 [ OK ]

Tests passed:   8
Tests failed:   0

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Co-developed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: fib_nexthops: List each test case in a different line
Ido Schimmel [Fri, 12 Mar 2021 16:50:22 +0000 (17:50 +0100)]
selftests: fib_nexthops: List each test case in a different line

The lines with the IPv4 and IPv6 test cases are already very long and
more test cases will be added in subsequent patches.

List each test case in a different line to make it easier to extend the
test with more test cases.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoselftests: fib_nexthops: Declutter test output
Ido Schimmel [Fri, 12 Mar 2021 16:50:21 +0000 (17:50 +0100)]
selftests: fib_nexthops: Declutter test output

Before:

 # ./fib_nexthops.sh -t ipv4_torture

IPv4 runtime torture
--------------------
TEST: IPv4 torture test                                             [ OK ]
./fib_nexthops.sh: line 213: 19376 Killed                  ipv4_del_add_loop1
./fib_nexthops.sh: line 213: 19377 Killed                  ipv4_grp_replace_loop
./fib_nexthops.sh: line 213: 19378 Killed                  ip netns exec me ping -f 172.16.101.1 > /dev/null 2>&1
./fib_nexthops.sh: line 213: 19380 Killed                  ip netns exec me ping -f 172.16.101.2 > /dev/null 2>&1
./fib_nexthops.sh: line 213: 19381 Killed                  ip netns exec me mausezahn veth1 -B 172.16.101.2 -A 172.16.1.1 -c 0 -t tcp "dp=1-1023, flags=syn" > /dev/null 2>&1

Tests passed:   1
Tests failed:   0

 # ./fib_nexthops.sh -t ipv6_torture

IPv6 runtime torture
--------------------
TEST: IPv6 torture test                                             [ OK ]
./fib_nexthops.sh: line 213: 24453 Killed                  ipv6_del_add_loop1
./fib_nexthops.sh: line 213: 24454 Killed                  ipv6_grp_replace_loop
./fib_nexthops.sh: line 213: 24456 Killed                  ip netns exec me ping -f 2001:db8:101::1 > /dev/null 2>&1
./fib_nexthops.sh: line 213: 24457 Killed                  ip netns exec me ping -f 2001:db8:101::2 > /dev/null 2>&1
./fib_nexthops.sh: line 213: 24458 Killed                  ip netns exec me mausezahn -6 veth1 -B 2001:db8:101::2 -A 2001:db8:91::1 -c 0 -t tcp "dp=1-1023, flags=syn" > /dev/null 2>&1

Tests passed:   1
Tests failed:   0

After:

 # ./fib_nexthops.sh -t ipv4_torture

IPv4 runtime torture
--------------------
TEST: IPv4 torture test                                             [ OK ]

Tests passed:   1
Tests failed:   0

 # ./fib_nexthops.sh -t ipv6_torture

IPv6 runtime torture
--------------------
TEST: IPv6 torture test                                             [ OK ]

Tests passed:   1
Tests failed:   0

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonetdevsim: Allow reporting activity on nexthop buckets
Ido Schimmel [Fri, 12 Mar 2021 16:50:20 +0000 (17:50 +0100)]
netdevsim: Allow reporting activity on nexthop buckets

A key component of the resilient hashing algorithm is the hash buckets'
activity. If a bucket is active, it will not be populated with a new
nexthop in order not to break existing flows. Therefore, in order to
easily and thoroughly test the algorithm, we need to be in full control
over the reported activity.

Add a debugfs interface that allows user space to have netdevsim report
a nexthop bucket within a resilient nexthop group as active. For
example:

 # echo 10 23 > /sys/kernel/debug/netdevsim/netdevsim10/fib/nexthop_bucket_activity

Will mark bucket 23 in nexthop group 10 as active.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonetdevsim: Add support for resilient nexthop groups
Ido Schimmel [Fri, 12 Mar 2021 16:50:19 +0000 (17:50 +0100)]
netdevsim: Add support for resilient nexthop groups

Allow resilient nexthop groups to be programmed and account their
occupancy according to their number of buckets. The nexthop group itself
as well as its buckets are marked with hardware flags (i.e.,
'RTNH_F_TRAP').

Replacement of a single nexthop bucket can fail using the following
debugfs knob:

 # cat /sys/kernel/debug/netdevsim/netdevsim10/fib/fail_nexthop_bucket_replace
 N
 # echo 1 > /sys/kernel/debug/netdevsim/netdevsim10/fib/fail_nexthop_bucket_replace
 # cat /sys/kernel/debug/netdevsim/netdevsim10/fib/fail_nexthop_bucket_replace
 Y

Replacement of a resilient nexthop group can fail using the following
debugfs knob:

 # cat /sys/kernel/debug/netdevsim/netdevsim10/fib/fail_res_nexthop_group_replace
 N
 # echo 1 > /sys/kernel/debug/netdevsim/netdevsim10/fib/fail_res_nexthop_group_replace
 # cat /sys/kernel/debug/netdevsim/netdevsim10/fib/fail_res_nexthop_group_replace
 Y

This enables testing of various error paths.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonetdevsim: Create a helper for setting nexthop hardware flags
Ido Schimmel [Fri, 12 Mar 2021 16:50:18 +0000 (17:50 +0100)]
netdevsim: Create a helper for setting nexthop hardware flags

Instead of calling nexthop_set_hw_flags(), call a helper. It will be
used to also set nexthop bucket flags in a subsequent patch.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonetdevsim: fib: Introduce a lock to guard nexthop hashtable
Petr Machata [Fri, 12 Mar 2021 16:50:17 +0000 (17:50 +0100)]
netdevsim: fib: Introduce a lock to guard nexthop hashtable

Currently netdevsim relies on RTNL to maintain exclusivity in accessing the
nexthop hash table. However, bucket notification may be called without RTNL
having been held. Instead, introduce a custom lock to guard the table.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'ptp-warnings'
David S. Miller [Sat, 13 Mar 2021 01:09:34 +0000 (17:09 -0800)]
Merge branch 'ptp-warnings'

Lee Jones says:

====================
Rid W=1 warnings from PTP

This set is part of a larger effort attempting to clean-up W=1
kernel builds, which are currently overwhelmingly riddled with
niggly little warnings.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoptp: ptp_p: Demote non-conformant kernel-doc headers and supply a param description
Lee Jones [Fri, 12 Mar 2021 11:09:10 +0000 (11:09 +0000)]
ptp: ptp_p: Demote non-conformant kernel-doc headers and supply a param description

Fixes the following W=1 kernel build warning(s):

 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'control' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'event' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'addend' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'accum' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'test' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'ts_compare' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'rsystime_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'rsystime_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'systime_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'systime_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'trgt_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'trgt_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'asms_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'asms_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'amms_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'amms_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'ch_control' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'ch_event' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'tx_snap_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'tx_snap_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'rx_snap_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'rx_snap_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'src_uuid_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'src_uuid_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'can_status' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'can_snap_lo' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'can_snap_hi' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'ts_sel' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'ts_st' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'reserve1' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'stl_max_set_en' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'stl_max_set' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'reserve2' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:78: warning: Function parameter or member 'srst' not described in 'pch_ts_regs'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'regs' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'ptp_clock' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'caps' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'exts0_enabled' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'exts1_enabled' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'mem_base' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'mem_size' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'irq' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'pdev' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:121: warning: Function parameter or member 'register_lock' not described in 'pch_dev'
 drivers/ptp/ptp_pch.c:128: warning: Function parameter or member 'station' not described in 'pch_params'
 drivers/ptp/ptp_pch.c:291: warning: Function parameter or member 'pdev' not described in 'pch_set_station_address'

Cc: Richard Cochran <richardcochran@gmail.com>
Cc: LAPIS SEMICONDUCTOR <tshimizu818@gmail.com>
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoptp: ptp_clockmatrix: Demote non-kernel-doc header to standard comment
Lee Jones [Fri, 12 Mar 2021 11:09:09 +0000 (11:09 +0000)]
ptp: ptp_clockmatrix: Demote non-kernel-doc header to standard comment

Fixes the following W=1 kernel build warning(s):

 drivers/ptp/ptp_clockmatrix.c:1408: warning: Cannot understand  * @brief Maximum absolute value for write phase offset in picoseconds
 drivers/ptp/ptp_clockmatrix.c:1408: warning: Cannot understand  * @brief Maximum absolute value for write phase offset in picoseconds
 drivers/ptp/ptp_clockmatrix.c:1408: warning: Cannot understand  * @brief Maximum absolute value for write phase offset in picoseconds
 drivers/ptp/ptp_clockmatrix.c:1408: warning: Cannot understand  * @brief Maximum absolute value for write phase offset in picoseconds
 drivers/ptp/ptp_clockmatrix.c:1408: warning: Cannot understand  * @brief Maximum absolute value for write phase offset in picoseconds

Cc: Richard Cochran <richardcochran@gmail.com>
Cc: IDT-support-1588@lm.renesas.com
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoptp_pch: Move 'pch_*()' prototypes to shared header
Lee Jones [Fri, 12 Mar 2021 11:09:08 +0000 (11:09 +0000)]
ptp_pch: Move 'pch_*()' prototypes to shared header

Fixes the following W=1 kernel build warning(s):

 drivers/ptp/ptp_pch.c:193:6: warning: no previous prototype for ‘pch_ch_control_write’ [-Wmissing-prototypes]
 drivers/ptp/ptp_pch.c:201:5: warning: no previous prototype for ‘pch_ch_event_read’ [-Wmissing-prototypes]
 drivers/ptp/ptp_pch.c:212:6: warning: no previous prototype for ‘pch_ch_event_write’ [-Wmissing-prototypes]
 drivers/ptp/ptp_pch.c:220:5: warning: no previous prototype for ‘pch_src_uuid_lo_read’ [-Wmissing-prototypes]
 drivers/ptp/ptp_pch.c:231:5: warning: no previous prototype for ‘pch_src_uuid_hi_read’ [-Wmissing-prototypes]
 drivers/ptp/ptp_pch.c:242:5: warning: no previous prototype for ‘pch_rx_snap_read’ [-Wmissing-prototypes]
 drivers/ptp/ptp_pch.c:259:5: warning: no previous prototype for ‘pch_tx_snap_read’ [-Wmissing-prototypes]
 drivers/ptp/ptp_pch.c:300:5: warning: no previous prototype for ‘pch_set_station_address’ [-Wmissing-prototypes]

Cc: Richard Cochran <richardcochran@gmail.com> (maintainer:PTP HARDWARE CLOCK SUPPORT)
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Flavio Suligoi <f.suligoi@asem.it>
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoptp_pch: Remove unused function 'pch_ch_control_read()'
Lee Jones [Fri, 12 Mar 2021 11:09:07 +0000 (11:09 +0000)]
ptp_pch: Remove unused function 'pch_ch_control_read()'

Fixes the following W=1 kernel build warning(s):

 drivers/ptp/ptp_pch.c:182:5: warning: no previous prototype for ‘pch_ch_control_read’ [-Wmissing-prototypes]

Cc: Richard Cochran <richardcochran@gmail.com> (maintainer:PTP HARDWARE CLOCK SUPPORT)
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Flavio Suligoi <f.suligoi@asem.it>
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: dsa: bcm_sf2: setup BCM4908 internal crossbar
Rafał Miłecki [Fri, 12 Mar 2021 10:41:08 +0000 (11:41 +0100)]
net: dsa: bcm_sf2: setup BCM4908 internal crossbar

On some SoCs (e.g. BCM4908, BCM631[345]8) SF2 has an integrated
crossbar. It allows connecting its selected external ports to internal
ports. It's used by vendors to handle custom Ethernet setups.

BCM4908 has following 3x2 crossbar. On Asus GT-AC5300 rgmii is used for
connecting external BCM53134S switch. GPHY4 is usually used for WAN
port. More fancy devices use SerDes for 2.5 Gbps Ethernet.

              ┌──────────┐
SerDes ─── 0 ─┤          │
              │   3x2    ├─ 0 ─── switch port 7
 GPHY4 ─── 1 ─┤          │
              │ crossbar ├─ 1 ─── runner (accelerator)
 rgmii ─── 2 ─┤          │
              └──────────┘

Use setup data based on DT info to configure BCM4908's switch port 7.
Right now only GPHY and rgmii variants are supported. Handling SerDes
can be implemented later.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: dsa: bcm_sf2: store PHY interface/mode in port structure
Rafał Miłecki [Fri, 12 Mar 2021 10:41:07 +0000 (11:41 +0100)]
net: dsa: bcm_sf2: store PHY interface/mode in port structure

It's needed later for proper switch / crossbar setup.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: ipv4: route.c: Fix indentation of multi line comment.
Shubhankar Kuranagatti [Fri, 12 Mar 2021 07:30:05 +0000 (13:00 +0530)]
net: ipv4: route.c: Fix indentation of multi line comment.

All comment lines inside the comment block have been aligned.
Every line of comment starts with a * (uniformity in code).

Signed-off-by: Shubhankar Kuranagatti <shubhankarvk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: broadcom: bcm4908_enet: support TX interrupt
Rafał Miłecki [Thu, 11 Mar 2021 12:35:21 +0000 (13:35 +0100)]
net: broadcom: bcm4908_enet: support TX interrupt

It appears that each DMA channel has its own interrupt and both rings
can be configured (the same way) to handle interrupts.

1. Make ring interrupts code generic (make it operate on given ring)
2. Move napi to ring (so each has its own)
3. Make IRQ handler generic (match ring against received IRQ number)
4. Add (optional) support for TX interrupt

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agodt-bindings: net: bcm4908-enet: add optional TX interrupt
Rafał Miłecki [Thu, 11 Mar 2021 12:35:20 +0000 (13:35 +0100)]
dt-bindings: net: bcm4908-enet: add optional TX interrupt

I discovered that hardware actually supports two interrupts, one per DMA
channel (RX and TX).

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'macb-fixed-link-fixes'
David S. Miller [Sat, 13 Mar 2021 00:44:46 +0000 (16:44 -0800)]
Merge branch 'macb-fixed-link-fixes'

Robert Hancock says:

====================
macb SGMII fixed-link fixes

Some fixes to the macb driver for use in SGMII mode with a fixed-link (such as
for chip-to-chip connectivity).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: macb: Disable PCS auto-negotiation for SGMII fixed-link mode
Robert Hancock [Thu, 11 Mar 2021 20:18:13 +0000 (14:18 -0600)]
net: macb: Disable PCS auto-negotiation for SGMII fixed-link mode

When using a fixed-link configuration in SGMII mode, it's not really
sensible to have auto-negotiation enabled since the link settings are
fixed by definition. In other configurations, such as an SGMII
connection to a PHY, it should generally be enabled.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet: macb: poll for fixed link state in SGMII mode
Robert Hancock [Thu, 11 Mar 2021 20:18:12 +0000 (14:18 -0600)]
net: macb: poll for fixed link state in SGMII mode

When using a fixed-link configuration with GEM in SGMII mode, such as
for a chip-to-chip interconnect, the link state was always showing as
established regardless of the actual connectivity state. We can monitor
the pcs_link_state bit in the Network Status register to determine
whether the PCS link state is actually up.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge tag 'mlx5-updates-2021-03-12' of git://git.kernel.org/pub/scm/linux/kernel...
David S. Miller [Sat, 13 Mar 2021 00:36:07 +0000 (16:36 -0800)]
Merge tag 'mlx5-updates-2021-03-12' of git://git./linux/kernel/git/saeed/linux

Saeed Mahameed says:

====================
mlx5-updates-2021-03-12

1) TC support for ICMP parameters
2) TC connection tracking with mirroring
3) A round of trivial fixups and cleanups
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonet/mlx5e: Allow to match on ICMP parameters
Maor Dickman [Sun, 24 Jan 2021 13:56:36 +0000 (15:56 +0200)]
net/mlx5e: Allow to match on ICMP parameters

Support matching on ICMPv4/6 type and code parameters using misc3
section of match parameters.

Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: CT: Add support for mirroring
Paul Blakey [Mon, 21 Sep 2020 08:49:26 +0000 (11:49 +0300)]
net/mlx5: CT: Add support for mirroring

Add support for mirroring before the CT action by spliting the pre ct rule.
Mirror outputs are done first on the tc chain,prio table rule (the fwd
rule), which will then forward to a per port fwd table.
On this fwd table, we insert the original pre ct rule that forwards to
ct/ct nat table.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: Display the command index in command mailbox dump
Alaa Hleihel [Thu, 31 Dec 2020 14:24:51 +0000 (16:24 +0200)]
net/mlx5: Display the command index in command mailbox dump

Multiple commands can be printed at the same time which can
lead to wrong order of their lines in dmesg output.
As a result, it's hard to match data dumps to the correct command
or which command was fully dumped at some point.

Fix this by displaying the corresponding command index, and also
indicate when a command was fully dumped.

Signed-off-by: Alaa Hleihel <alaa@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5e: allocate 'indirection_rqt' buffer dynamically
Arnd Bergmann [Mon, 8 Mar 2021 15:32:57 +0000 (16:32 +0100)]
net/mlx5e: allocate 'indirection_rqt' buffer dynamically

Increasing the size of the indirection_rqt array from 128 to 256 bytes
pushed the stack usage of the mlx5e_hairpin_fill_rqt_rqns() function
over the warning limit when building with clang and CONFIG_KASAN:

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:970:1: error: stack frame size of 1180 bytes in function 'mlx5e_tc_add_nic_flow' [-Werror,-Wframe-larger-than=]

Using dynamic allocation here is safe because the caller does the
same, and it reduces the stack usage of the function to just a few
bytes.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5e: Dump ICOSQ WQE descriptor on CQE with error events
Tariq Toukan [Wed, 17 Feb 2021 09:43:28 +0000 (11:43 +0200)]
net/mlx5e: Dump ICOSQ WQE descriptor on CQE with error events

Dump the ICOSQ's WQE descriptor when a completion with error is received.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5e: Use net_prefetchw instead of prefetchw in MPWQE TX datapath
Maxim Mikityanskiy [Fri, 29 Jan 2021 16:43:31 +0000 (18:43 +0200)]
net/mlx5e: Use net_prefetchw instead of prefetchw in MPWQE TX datapath

Commit e20f0dbf204f ("net/mlx5e: RX, Add a prefetch command for small
L1_CACHE_BYTES") switched to using net_prefetchw at all places in mlx5e.
In the same time frame, commit 5af75c747e2a ("net/mlx5e: Enhanced TX
MPWQE for SKBs") added one more usage of prefetchw. When these two
changes were merged, this new occurrence of prefetchw wasn't replaced
with net_prefetchw.

This commit fixes this last occurrence of prefetchw in
mlx5e_tx_mpwqe_session_start, making the same change that was done in
mlx5e_xdp_mpwqe_session_start.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5e: Remove redundant newline in NL_SET_ERR_MSG_MOD
Roi Dayan [Tue, 9 Mar 2021 16:25:59 +0000 (18:25 +0200)]
net/mlx5e: Remove redundant newline in NL_SET_ERR_MSG_MOD

Fix the following coccicheck warnings:

drivers/net/ethernet/mellanox/mlx5/core/devlink.c:145:29-66: WARNING
avoid newline at end of message in NL_SET_ERR_MSG_MOD
drivers/net/ethernet/mellanox/mlx5/core/devlink.c:140:29-77: WARNING
avoid newline at end of message in NL_SET_ERR_MSG_MOD

Signed-off-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: Read congestion counters from all ports when lag is active
Mark Zhang [Tue, 2 Feb 2021 11:28:29 +0000 (13:28 +0200)]
net/mlx5: Read congestion counters from all ports when lag is active

Read congestion counters from all ports in any lag mode rather than
only in RoCE lag mode (e.g., VF lag).

Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: remove unneeded semicolon
Jiapeng Chong [Mon, 22 Feb 2021 09:56:59 +0000 (17:56 +0800)]
net/mlx5: remove unneeded semicolon

Fix the following coccicheck warnings:

./drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c:495:2-3: Unneeded
semicolon.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: use kvfree() for memory allocated with kvzalloc()
Junlin Yang [Wed, 3 Mar 2021 02:40:19 +0000 (10:40 +0800)]
net/mlx5: use kvfree() for memory allocated with kvzalloc()

It is allocated with kvzalloc(), the corresponding release function
should not be kfree(), use kvfree() instead.

Generated by: scripts/coccinelle/api/kfree_mismatch.cocci

Signed-off-by: Junlin Yang <yangjunlin@yulong.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: DR, Add missing vhca_id consume from STEv1
Yevgeny Kliteynik [Sat, 6 Feb 2021 20:41:41 +0000 (22:41 +0200)]
net/mlx5: DR, Add missing vhca_id consume from STEv1

The field source_eswitch_owner_vhca_id was not consumed
in the same way as in STEv0. Added the missing set.

Fixes: 10b694186410 ("net/mlx5: DR, Add HW STEv1 match logic")
Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: DR, Remove unneeded rx_decap_l3 function for STEv1
Yevgeny Kliteynik [Sat, 6 Feb 2021 13:39:25 +0000 (15:39 +0200)]
net/mlx5: DR, Remove unneeded rx_decap_l3 function for STEv1

Remove the dr_ste_v1_set_rx_decap_l3 function that was
replaced by another function - fixing a rebase error.

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agonet/mlx5: DR, Fixed typo in STE v0
Yevgeny Kliteynik [Sat, 6 Feb 2021 13:20:41 +0000 (15:20 +0200)]
net/mlx5: DR, Fixed typo in STE v0

"reforamt" -> "reformat"

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
3 years agodocs: networking: phy: Improve placement of parenthesis
Jonathan Neuschäfer [Thu, 11 Mar 2021 17:22:34 +0000 (18:22 +0100)]
docs: networking: phy: Improve placement of parenthesis

"either" is outside the parentheses, so the matching "or" should be too.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'tcp-delayed-completions'
David S. Miller [Fri, 12 Mar 2021 02:35:31 +0000 (18:35 -0800)]
Merge branch 'tcp-delayed-completions'

Eric Dumazet says:

====================
tcp: better deal with delayed TX completions

Jakub and Neil reported an increase of RTO timers whenever
TX completions are delayed a bit more (by increasing
NIC TX coalescing parameters)

While problems have been there forever, second patch might
introduce some regressions so I prefer not backport
them to stable releases before things settle.

Many thanks to FB team for their help and tests.

Few packetdrill tests need to be changed to reflect
the improvements brought by this series.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agotcp: remove obsolete check in __tcp_retransmit_skb()
Eric Dumazet [Thu, 11 Mar 2021 20:35:06 +0000 (12:35 -0800)]
tcp: remove obsolete check in __tcp_retransmit_skb()

TSQ provides a nice way to avoid bufferbloat on individual socket,
including retransmit packets. We can get rid of the old
heuristic:

/* Do not sent more than we queued. 1/4 is reserved for possible
 * copying overhead: fragmentation, tunneling, mangling etc.
 */
if (refcount_read(&sk->sk_wmem_alloc) >
    min_t(u32, sk->sk_wmem_queued + (sk->sk_wmem_queued >> 2),
  sk->sk_sndbuf))
return -EAGAIN;

This heuristic was giving false positives according to Jakub,
whenever TX completions are delayed above RTT. (Ack packets
are processed by TCP stack before clones are orphaned/freed)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jakub Kicinski <kuba@kernel.org>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agotcp: consider using standard rtx logic in tcp_rcv_fastopen_synack()
Eric Dumazet [Thu, 11 Mar 2021 20:35:05 +0000 (12:35 -0800)]
tcp: consider using standard rtx logic in tcp_rcv_fastopen_synack()

Jakub reported Data included in a Fastopen SYN that had to be
retransmit would have to wait for an RTO if TX completions are slow,
even with prior fix.

This is because tcp_rcv_fastopen_synack() does not use standard
rtx logic, meaning TSQ handler exits early in tcp_tsq_write()
because tp->lost_out == tp->retrans_out

Lets make tcp_rcv_fastopen_synack() use standard rtx logic,
by using tcp_mark_skb_lost() on the skb thats needs to be
sent again.

Not this raised a warning in tcp_fastretrans_alert() during my tests
since we consider the data not being aknowledged
by the receiver does not mean packet was lost on the network.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jakub Kicinski <kuba@kernel.org>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agotcp: plug skb_still_in_host_queue() to TSQ
Eric Dumazet [Thu, 11 Mar 2021 20:35:04 +0000 (12:35 -0800)]
tcp: plug skb_still_in_host_queue() to TSQ

Jakub and Neil reported an increase of RTO timers whenever
TX completions are delayed a bit more (by increasing
NIC TX coalescing parameters)

Main issue is that TCP stack has a logic preventing a packet
being retransmit if the prior clone has not yet been
orphaned or freed.

This logic came with commit 1f3279ae0c13 ("tcp: avoid
retransmits of TCP packets hanging in host queues")

Thankfully, in the case skb_still_in_host_queue() detects
the initial clone is still in flight, it can use TSQ logic
that will eventually retry later, at the moment the clone
is freed or orphaned.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Neil Spring <ntspring@fb.com>
Reported-by: Jakub Kicinski <kuba@kernel.org>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoisdn: remove extra spaces in the header file
Tong Zhang [Thu, 11 Mar 2021 04:27:55 +0000 (23:27 -0500)]
isdn: remove extra spaces in the header file

fix some coding style issues in the isdn header

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agotipc: clean up warnings detected by sparse
Hoang Huu Le [Thu, 11 Mar 2021 03:33:23 +0000 (10:33 +0700)]
tipc: clean up warnings detected by sparse

This patch fixes the following warning from sparse:

net/tipc/monitor.c:263:35: warning: incorrect type in assignment (different base types)
net/tipc/monitor.c:263:35:    expected unsigned int
net/tipc/monitor.c:263:35:    got restricted __be32 [usertype]
[...]
net/tipc/node.c:374:13: warning: context imbalance in 'tipc_node_read_lock' - wrong count at exit
net/tipc/node.c:379:13: warning: context imbalance in 'tipc_node_read_unlock' - unexpected unlock
net/tipc/node.c:384:13: warning: context imbalance in 'tipc_node_write_lock' - wrong count at exit
net/tipc/node.c:389:13: warning: context imbalance in 'tipc_node_write_unlock_fast' - unexpected unlock
net/tipc/node.c:404:17: warning: context imbalance in 'tipc_node_write_unlock' - unexpected unlock
[...]
net/tipc/crypto.c:1201:9: warning: incorrect type in initializer (different address spaces)
net/tipc/crypto.c:1201:9:    expected struct tipc_aead [noderef] __rcu *__tmp
net/tipc/crypto.c:1201:9:    got struct tipc_aead *
[...]

Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Hoang Huu Le <hoang.h.le@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agotipc: convert dest node's address to network order
Hoang Le [Thu, 11 Mar 2021 03:33:22 +0000 (10:33 +0700)]
tipc: convert dest node's address to network order

(struct tipc_link_info)->dest is in network order (__be32), so we must
convert the value to network order before assigning. The problem detected
by sparse:

net/tipc/netlink_compat.c:699:24: warning: incorrect type in assignment (different base types)
net/tipc/netlink_compat.c:699:24:    expected restricted __be32 [usertype] dest
net/tipc/netlink_compat.c:699:24:    got int

Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'mlxsw-Implement-sampling-using-mirroring'
David S. Miller [Fri, 12 Mar 2021 00:22:39 +0000 (16:22 -0800)]
Merge branch 'mlxsw-Implement-sampling-using-mirroring'

Ido Schimmel says:

====================
mlxsw: Implement sampling using mirroring

So far, sampling was implemented using a dedicated sampling mechanism
that is available on all Spectrum ASICs. Spectrum-2 and later ASICs
support sampling by mirroring packets to the CPU port with probability.
This method has a couple of advantages compared to the legacy method:

* Extra metadata per-packet: Egress port, egress traffic class, traffic
  class occupancy and end-to-end latency
* Ability to sample packets on egress / per-flow as opposed to only
  ingress

This series should not result in any user-visible changes and its aim is
to convert Spectrum-2 and later ASICs to perform sampling by mirroring
to the CPU port with probability. Future submissions will expose the
additional metadata and enable sampling using more triggers (e.g.,
egress).

Series overview:

Patches #1-#3 extend the SPAN (mirroring) module to accept new
parameters required for sampling. See individual commit messages for
detailed explanation.

Patch #4-#5 split sampling support between Spectrum-1 and later ASIC while
still using the legacy method for all ASIC generations.

Patch #6 converts Spectrum-2 and later ASICs to perform sampling by
mirroring to the CPU port with probability.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomlxsw: spectrum_matchall: Implement sampling using mirroring
Ido Schimmel [Thu, 11 Mar 2021 12:24:16 +0000 (14:24 +0200)]
mlxsw: spectrum_matchall: Implement sampling using mirroring

Spectrum-2 and later ASICs support sampling of packets by mirroring to
the CPU with probability. There are several advantages compared to the
legacy dedicated sampling mechanism:

* Extra metadata per-packet: Egress port, egress traffic class, traffic
  class occupancy and end-to-end latency
* Ability to sample packets on egress / per-flow

Convert Spectrum-2 and later ASICs to perform sampling by mirroring to
the CPU with probability.

Subsequent patches will add support for egress / per-flow sampling and
expose the extra metadata.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomlxsw: spectrum_trap: Split sampling traps between ASICs
Ido Schimmel [Thu, 11 Mar 2021 12:24:15 +0000 (14:24 +0200)]
mlxsw: spectrum_trap: Split sampling traps between ASICs

Sampling of ingress packets is supported using a dedicated sampling
mechanism on all Spectrum ASICs. However, Spectrum-2 and later ASICs
support more sophisticated sampling by mirroring packets to the CPU.

As a preparation for more advanced sampling configurations, split the trap
configuration used for sampled packets between Spectrum-1 and later ASICs.

This is needed since packets that are mirrored to the CPU are trapped
via a different trap identifier compared to packets that are sampled
using the dedicated sampling mechanism.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomlxsw: spectrum_matchall: Split sampling support between ASICs
Ido Schimmel [Thu, 11 Mar 2021 12:24:14 +0000 (14:24 +0200)]
mlxsw: spectrum_matchall: Split sampling support between ASICs

Sampling of ingress packets is supported using a dedicated sampling
mechanism on all Spectrum ASICs. However, Spectrum-2 and later ASICs
support more sophisticated sampling by mirroring packets to the CPU.

As a preparation for more advanced sampling configurations, split the
sampling operations between Spectrum-1 and later ASICs.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomlxsw: spectrum_span: Add SPAN probability rate support
Ido Schimmel [Thu, 11 Mar 2021 12:24:13 +0000 (14:24 +0200)]
mlxsw: spectrum_span: Add SPAN probability rate support

Currently, every packet that matches a mirroring trigger (e.g., received
packets, buffer dropped packets) is mirrored. Spectrum-2 and later ASICs
support mirroring with probability, where every 1 in N matched packets
is mirrored.

Extend the API that creates the binding between the trigger and the SPAN
agent with a probability rate parameter, which is an attribute of the
trigger. Set it to '1' to maintain existing behavior.

Subsequent patches will use it to perform more sophisticated sampling,
by mirroring packets to the CPU with probability.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomlxsw: reg: Extend mirroring registers with probability rate field
Ido Schimmel [Thu, 11 Mar 2021 12:24:12 +0000 (14:24 +0200)]
mlxsw: reg: Extend mirroring registers with probability rate field

The MPAR and MPAGR registers are used to configure the binding between
the mirroring trigger (e.g., received packet) and the SPAN agent. Add
probability rate field, which will allow us to support sampling by
mirroring to the CPU.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agomlxsw: spectrum_span: Add SPAN session identifier support
Ido Schimmel [Thu, 11 Mar 2021 12:24:11 +0000 (14:24 +0200)]
mlxsw: spectrum_span: Add SPAN session identifier support

When packets are mirrored to the CPU, the trap identifier with which the
packets are trapped is determined according to the session identifier of
the SPAN agent performing the mirroring. Packets that are trapped for
the same logical reason (e.g., buffer drops) should use the same session
identifier.

Currently, a single session is implicitly supported (identifier 0) and
is used for packets that are mirrored to the CPU due to buffer drops
(e.g., early drop).

Subsequent patches are going to mirror packets to the CPU due to
sampling, which will require a different session identifier.

Prepare for that by making the session identifier an attribute of the
SPAN agent.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge tag 'mlx5-updates-2021-03-11' of git://git.kernel.org/pub/scm/linux/kernel...
David S. Miller [Fri, 12 Mar 2021 00:17:43 +0000 (16:17 -0800)]
Merge tag 'mlx5-updates-2021-03-11' of git://git./linux/kernel/git/saeed/linux

Saeed Mahameed says:

====================
This series provides some cleanups to mlx5 driver
For more information please see tag log below.

Please pull and let me know if there is any problem.

mlx5-updates-2021-03-11

Cleanups for mlx5 driver

1) Fix build warnings form Arnd and Vlad
2) Leon improves locking for driver load/unload flows
3) From Roi, Lockdep false dependency warning
4) Other trivial cleanups
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agoMerge branch 'nexthop-Resilient-next-hop-groups'
David S. Miller [Fri, 12 Mar 2021 00:13:00 +0000 (16:13 -0800)]
Merge branch 'nexthop-Resilient-next-hop-groups'

Petr Machata says:

====================
nexthop: Resilient next-hop groups

At this moment, there is only one type of next-hop group: an mpath group.
Mpath groups implement the hash-threshold algorithm, described in RFC
2992[1].

To select a next hop, hash-threshold algorithm first assigns a range of
hashes to each next hop in the group, and then selects the next hop by
comparing the SKB hash with the individual ranges. When a next hop is
removed from the group, the ranges are recomputed, which leads to
reassignment of parts of hash space from one next hop to another. RFC 2992
illustrates it thus:

             +-------+-------+-------+-------+-------+
             |   1   |   2   |   3   |   4   |   5   |
             +-------+-+-----+---+---+-----+-+-------+
             |    1    |    2    |    4    |    5    |
             +---------+---------+---------+---------+

              Before and after deletion of next hop 3
      under the hash-threshold algorithm.

Note how next hop 2 gave up part of the hash space in favor of next hop 1,
and 4 in favor of 5. While there will usually be some overlap between the
previous and the new distribution, some traffic flows change the next hop
that they resolve to.

If a multipath group is used for load-balancing between multiple servers,
this hash space reassignment causes an issue that packets from a single
flow suddenly end up arriving at a server that does not expect them, which
may lead to TCP reset.

If a multipath group is used for load-balancing among available paths to
the same server, the issue is that different latencies and reordering along
the way causes the packets to arrive in the wrong order.

Resilient hashing is a technique to address the above problem. Resilient
next-hop group has another layer of indirection between the group itself
and its constituent next hops: a hash table. The selection algorithm uses a
straightforward modulo operation on the SKB hash to choose a hash table
bucket, then reads the next hop that this bucket contains, and forwards
traffic there.

This indirection brings an important feature. In the hash-threshold
algorithm, the range of hashes associated with a next hop must be
continuous. With a hash table, mapping between the hash table buckets and
the individual next hops is arbitrary. Therefore when a next hop is deleted
the buckets that held it are simply reassigned to other next hops:

             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
             |1|1|1|1|2|2|2|2|3|3|3|3|4|4|4|4|5|5|5|5|
             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      v v v v
             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
             |1|1|1|1|2|2|2|2|1|2|4|5|4|4|4|4|5|5|5|5|
             +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

              Before and after deletion of next hop 3
      under the resilient hashing algorithm.

When weights of next hops in a group are altered, it may be possible to
choose a subset of buckets that are currently not used for forwarding
traffic, and use those to satisfy the new next-hop distribution demands,
keeping the "busy" buckets intact. This way, established flows are ideally
kept being forwarded to the same endpoints through the same paths as before
the next-hop group change.

This patch set adds the implementation of resilient next-hop groups.

In a nutshell, the algorithm works as follows. Each next hop has a number
of buckets that it wants to have, according to its weight and the number of
buckets in the hash table. In case of an event that might cause bucket
allocation change, the numbers for individual next hops are updated,
similarly to how ranges are updated for mpath group next hops. Following
that, a new "upkeep" algorithm runs, and for idle buckets that belong to a
next hop that is currently occupying more buckets than it wants (it is
"overweight"), it migrates the buckets to one of the next hops that has
fewer buckets than it wants (it is "underweight"). If, after this, there
are still underweight next hops, another upkeep run is scheduled to a
future time.

Chances are there are not enough "idle" buckets to satisfy the new demands.
The algorithm has knobs to select both what it means for a bucket to be
idle, and for whether and when to forcefully migrate buckets if there keeps
being an insufficient number of idle ones.

To illustrate the usage, consider the following commands:

 # ip nexthop add id 1 via 192.0.2.2 dev dummy1
 # ip nexthop add id 2 via 192.0.2.3 dev dummy1
 # ip nexthop add id 10 group 1/2 type resilient \
buckets 8 idle_timer 60 unbalanced_timer 300

The last command creates a resilient next-hop group. It will have 8
buckets, each bucket will be considered idle when no traffic hits it for at
least 60 seconds, and if the table remains out of balance for 300 seconds,
it will be forcefully brought into balance.

If not present in netlink message, the idle timer defaults to 120 seconds,
and there is no unbalanced timer, meaning the group may remain unbalanced
indefinitely. The value of 120 is the default in Cumulus implementation of
resilient next-hop groups. To a degree the default is arbitrary, the only
value that certainly does not make sense is 0. Therefore going with an
existing deployed implementation is reasonable.

Unbalanced time, i.e. how long since the last time that all nexthops had as
many buckets as they should according to their weights, is reported when
the group is dumped:

 # ip nexthop show id 10
 id 10 group 1/2 type resilient buckets 8 idle_timer 60 unbalanced_timer 300 unbalanced_time 0

When replacing next hops or changing weights, if one does not specify some
parameters, their value is left as it was:

 # ip nexthop replace id 10 group 1,2/2 type resilient
 # ip nexthop show id 10
 id 10 group 1,2/2 type resilient buckets 8 idle_timer 60 unbalanced_timer 300 unbalanced_time 0

It is also possible to do a dump of individual buckets (and now you know
why there were only 8 of them in the example above):

 # ip nexthop bucket show id 10
 id 10 index 0 idle_time 5.59 nhid 1
 id 10 index 1 idle_time 5.59 nhid 1
 id 10 index 2 idle_time 8.74 nhid 2
 id 10 index 3 idle_time 8.74 nhid 2
 id 10 index 4 idle_time 8.74 nhid 1
 id 10 index 5 idle_time 8.74 nhid 1
 id 10 index 6 idle_time 8.74 nhid 1
 id 10 index 7 idle_time 8.74 nhid 1

Note the two buckets that have a shorter idle time. Those are the ones that
were migrated after the nexthop replace command to satisfy the new demand
that nexthop 1 be given 6 buckets instead of 4.

The patchset proceeds as follows:

- Patches #1 and #2 are small refactoring patches.

- Patch #3 adds a new flag to struct nh_group, is_multipath. This flag is
  meant to be set for all nexthop groups that in general have several
  nexthops from which they choose, and avoids a more expensive dispatch
  based on reading several flags, one for each nexthop group type.

- Patch #4 contains defines of new UAPI attributes and the new next-hop
  group type. At this point, the nexthop code is made to bounce the new
  type. As the resilient hashing code is gradually added in the following
  patch sets, it will remain dead. The last patch will make it accessible.

  This patch also adds a suite of new messages related to next hop buckets.
  This approach was taken instead of overloading the information on the
  existing RTM_{NEW,DEL,GET}NEXTHOP messages for the following reasons.

  First, a next-hop group can contain a large number of next-hop buckets
  (4k is not unheard of). This imposes limits on the amount of information
  that can be encoded for each next-hop bucket given a netlink message is
  limited to 64k bytes.

  Second, while RTM_NEWNEXTHOPBUCKET is only used for notifications at this
  point, in the future it can be extended to provide user space with
  control over next-hop buckets configuration.

- Patch #5 contains the meat of the resilient next-hop group support.

- Patches #6 and #7 implement support for notifications towards the
  drivers.

- Patch #8 adds an interface for the drivers to report resilient hash
  table bucket activity. Drivers will be able to report through this
  interface whether traffic is hitting a given bucket.

- Patch #9 adds an interface for the drivers to report whether a given
  hash table bucket is offloaded or trapping traffic.

- In patches #10, #11, #12 and #13, UAPI is implemented. This includes all
  the code necessary for creation of resilient groups, bucket dumping and
  getting, and bucket migration notifications.

- In patch #14 the next-hop groups are finally made available.

The overall plan is to contribute approximately the following patchsets:

1) Nexthop policy refactoring (already pushed)
2) Preparations for resilient next-hop groups (already pushed)
3) Implementation of resilient next-hop groups (this patchset)
4) Netdevsim offload plus a suite of selftests
5) Preparations for mlxsw offload of resilient next-hop groups
6) mlxsw offload including selftests

Interested parties can look at the current state of the code at [2] and
[3].

[1] https://tools.ietf.org/html/rfc2992
[2] https://github.com/idosch/linux/commits/submit/res_integ_v1
[3] https://github.com/idosch/iproute2/commits/submit/res_v1
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Enable resilient next-hop groups
Petr Machata [Thu, 11 Mar 2021 18:03:25 +0000 (19:03 +0100)]
nexthop: Enable resilient next-hop groups

Now that all the code is in place, stop rejecting requests to create
resilient next-hop groups.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Notify userspace about bucket migrations
Petr Machata [Thu, 11 Mar 2021 18:03:24 +0000 (19:03 +0100)]
nexthop: Notify userspace about bucket migrations

Nexthop replacements et.al. are notified through netlink, but if a delayed
work migrates buckets on the background, userspace will stay oblivious.
Notify these as RTM_NEWNEXTHOPBUCKET events.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Add netlink handlers for bucket get
Petr Machata [Thu, 11 Mar 2021 18:03:23 +0000 (19:03 +0100)]
nexthop: Add netlink handlers for bucket get

Allow getting (but not setting) individual buckets to inspect the next hop
mapped therein, idle time, and flags.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Add netlink handlers for bucket dump
Petr Machata [Thu, 11 Mar 2021 18:03:22 +0000 (19:03 +0100)]
nexthop: Add netlink handlers for bucket dump

Add a dump handler for resilient next hop buckets. When next-hop group ID
is given, it walks buckets of that group, otherwise it walks buckets of all
groups. It then dumps the buckets whose next hops match the given filtering
criteria.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Add netlink handlers for resilient nexthop groups
Petr Machata [Thu, 11 Mar 2021 18:03:21 +0000 (19:03 +0100)]
nexthop: Add netlink handlers for resilient nexthop groups

Implement the netlink messages that allow creation and dumping of resilient
nexthop groups.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Allow reporting activity of nexthop buckets
Ido Schimmel [Thu, 11 Mar 2021 18:03:20 +0000 (19:03 +0100)]
nexthop: Allow reporting activity of nexthop buckets

The kernel periodically checks the idle time of nexthop buckets to
determine if they are idle and can be re-populated with a new nexthop.

When the resilient nexthop group is offloaded to hardware, the kernel
will not see activity on nexthop buckets unless it is reported from
hardware.

Add a function that can be periodically called by device drivers to
report activity on nexthop buckets after querying it from the underlying
device.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Allow setting "offload" and "trap" indication of nexthop buckets
Ido Schimmel [Thu, 11 Mar 2021 18:03:19 +0000 (19:03 +0100)]
nexthop: Allow setting "offload" and "trap" indication of nexthop buckets

Add a function that can be called by device drivers to set "offload" or
"trap" indication on nexthop buckets following nexthop notifications and
other changes such as a neighbour becoming invalid.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Implement notifiers for resilient nexthop groups
Petr Machata [Thu, 11 Mar 2021 18:03:18 +0000 (19:03 +0100)]
nexthop: Implement notifiers for resilient nexthop groups

Implement the following notifications towards drivers:

- NEXTHOP_EVENT_REPLACE, when a resilient nexthop group is created.

- NEXTHOP_EVENT_BUCKET_REPLACE any time there is a change in assignment of
  next hops to hash table buckets. That includes replacements, deletions,
  and delayed upkeep cycles. Some bucket notifications can be vetoed by the
  driver, to make it possible to propagate bucket busy-ness flags from the
  HW back to the algorithm. Some are however forced, e.g. if a next hop is
  deleted, all buckets that use this next hop simply must be migrated,
  whether the HW wishes so or not.

- NEXTHOP_EVENT_RES_TABLE_PRE_REPLACE, before a resilient nexthop group is
  replaced. Usually the driver will get the bucket notifications as well,
  and could veto those. But in some cases, a bucket may not be migrated
  immediately, but during delayed upkeep, and that is too late to roll the
  transaction back. This notification allows the driver to take a look and
  veto the new proposed group up front, before anything is committed.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Add data structures for resilient group notifications
Ido Schimmel [Thu, 11 Mar 2021 18:03:17 +0000 (19:03 +0100)]
nexthop: Add data structures for resilient group notifications

Add data structures that will be used for in-kernel notifications about
addition / deletion of a resilient nexthop group and about changes to a
hash bucket within a resilient group.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Add implementation of resilient next-hop groups
Petr Machata [Thu, 11 Mar 2021 18:03:16 +0000 (19:03 +0100)]
nexthop: Add implementation of resilient next-hop groups

At this moment, there is only one type of next-hop group: an mpath group,
which implements the hash-threshold algorithm.

To select a next hop, hash-threshold algorithm first assigns a range of
hashes to each next hop in the group, and then selects the next hop by
comparing the SKB hash with the individual ranges. When a next hop is
removed from the group, the ranges are recomputed, which leads to
reassignment of parts of hash space from one next hop to another. While
there will usually be some overlap between the previous and the new
distribution, some traffic flows change the next hop that they resolve to.
That causes problems e.g. as established TCP connections are reset, because
the traffic is forwarded to a server that is not familiar with the
connection.

Resilient hashing is a technique to address the above problem. Resilient
next-hop group has another layer of indirection between the group itself
and its constituent next hops: a hash table. The selection algorithm uses a
straightforward modulo operation to choose a hash bucket, and then reads
the next hop that this bucket contains, and forwards traffic there.

This indirection brings an important feature. In the hash-threshold
algorithm, the range of hashes associated with a next hop must be
continuous. With a hash table, mapping between the hash table buckets and
the individual next hops is arbitrary. Therefore when a next hop is deleted
the buckets that held it are simply reassigned to other next hops. When
weights of next hops in a group are altered, it may be possible to choose a
subset of buckets that are currently not used for forwarding traffic, and
use those to satisfy the new next-hop distribution demands, keeping the
"busy" buckets intact. This way, established flows are ideally kept being
forwarded to the same endpoints through the same paths as before the
next-hop group change.

In a nutshell, the algorithm works as follows. Each next hop has a number
of buckets that it wants to have, according to its weight and the number of
buckets in the hash table. In case of an event that might cause bucket
allocation change, the numbers for individual next hops are updated,
similarly to how ranges are updated for mpath group next hops. Following
that, a new "upkeep" algorithm runs, and for idle buckets that belong to a
next hop that is currently occupying more buckets than it wants (it is
"overweight"), it migrates the buckets to one of the next hops that has
fewer buckets than it wants (it is "underweight"). If, after this, there
are still underweight next hops, another upkeep run is scheduled to a
future time.

Chances are there are not enough "idle" buckets to satisfy the new demands.
The algorithm has knobs to select both what it means for a bucket to be
idle, and for whether and when to forcefully migrate buckets if there keeps
being an insufficient number of idle buckets.

There are three users of the resilient data structures.

- The forwarding code accesses them under RCU, and does not modify them
  except for updating the time a selected bucket was last used.

- Netlink code, running under RTNL, which may modify the data.

- The delayed upkeep code, which may modify the data. This runs unlocked,
  and mutual exclusion between the RTNL code and the delayed upkeep is
  maintained by canceling the delayed work synchronously before the RTNL
  code touches anything. Later it restarts the delayed work if necessary.

The RTNL code has to implement next-hop group replacement, next hop
removal, etc. For removal, the mpath code uses a neat trick of having a
backup next hop group structure, doing the necessary changes offline, and
then RCU-swapping them in. However, the hash tables for resilient hashing
are about an order of magnitude larger than the groups themselves (the size
might be e.g. 4K entries), and it was felt that keeping two of them is an
overkill. Both the primary next-hop group and the spare therefore use the
same resilient table, and writers are careful to keep all references valid
for the forwarding code. The hash table references next-hop group entries
from the next-hop group that is currently in the primary role (i.e. not
spare). During the transition from primary to spare, the table references a
mix of both the primary group and the spare. When a next hop is deleted,
the corresponding buckets are not set to NULL, but instead marked as empty,
so that the pointer is valid and can be used by the forwarding code. The
buckets are then migrated to a new next-hop group entry during upkeep. The
only times that the hash table is invalid is the very beginning and very
end of its lifetime. Between those points, it is always kept valid.

This patch introduces the core support code itself. It does not handle
notifications towards drivers, which are kept as if the group were an mpath
one. It does not handle netlink either. The only bit currently exposed to
user space is the new next-hop group type, and that is currently bounced.
There is therefore no way to actually access this code.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
3 years agonexthop: Add netlink defines and enumerators for resilient NH groups
Ido Schimmel [Thu, 11 Mar 2021 18:03:15 +0000 (19:03 +0100)]
nexthop: Add netlink defines and enumerators for resilient NH groups

- RTM_NEWNEXTHOP et.al. that handle resilient groups will have a new nested
  attribute, NHA_RES_GROUP, whose elements are attributes NHA_RES_GROUP_*.

- RTM_NEWNEXTHOPBUCKET et.al. is a suite of new messages that will
  currently serve only for dumping of individual buckets of resilient next
  hop groups. For nexthop group buckets, these messages will carry a nested
  attribute NHA_RES_BUCKET, whose elements are attributes NHA_RES_BUCKET_*.

  There are several reasons why a new suite of messages is created for
  nexthop buckets instead of overloading the information on the existing
  RTM_{NEW,DEL,GET}NEXTHOP messages.

  First, a nexthop group can contain a large number of nexthop buckets (4k
  is not unheard of). This imposes limits on the amount of information that
  can be encoded for each nexthop bucket given a netlink message is limited
  to 64k bytes.

  Second, while RTM_NEWNEXTHOPBUCKET is only used for notifications at
  this point, in the future it can be extended to provide user space with
  control over nexthop buckets configuration.

- The new group type is NEXTHOP_GRP_TYPE_RES. Note that nexthop code is
  adjusted to bounce groups with that type for now.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>