Shannon Nelson says:

====================
ionic bits and bytes

These are a few little updates to the ionic driver while we are in between
other feature work.  While these are mostly Fixes, they are almost all low
priority and needn't be promoted to net.  The one higher need is patch 1,
but it is fixing something that hasn't made it out of net-next yet.

v3: allow decode of unknown transciever and use type
    codes from sfp.h
v2: add Fixes tags to patches 1-4, and a little
    description for patch 5
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add decoding for a new firmware error code.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

If we don't recognize the transceiver type, set the xcvr type
and data length such that ethtool can at least print the first
256 bytes and the reader can figure out why the transceiver
is not recognized.

While we're here, we can update the phy_id type values to use
the enum values in sfp.h.

Fixes: 4d03e00a ("ionic: Add initial ethtool support")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove the adminq's napi struct when tearing down
the adminq.

Fixes: 1d062b7b ("ionic: Add basic adminq support")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

Don't bother de-initing RSS if it wasn't selected.

Fixes: aa319881 ("ionic: Add RSS support")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

If we don't set a port type, the devlink code will eventually
print a WARN in the kernel log.  Because the mgmt device is
not really a useful port, don't register it as a devlink port.

Fixes: b3f064e9 ("ionic: add support for device id 0x1004")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

Eric Dumazet says:

====================
net_sched: allow use of hrtimer slack

Packet schedulers have used hrtimers with exact expiry times.

Some of them can afford having a slack, in order to reduce
the number of timer interrupts and feed bigger batches
to increase efficiency.

FQ for example does not care if throttled packets are
sent with an additional (small) delay.

Original observation of having maybe too many interrupts
was made by Willem de Bruijn.

v2: added strict netlink checking (Jakub Kicinski)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a new attribute to control the fq qdisc hrtimer slack.

Default is set to 10 usec.

When/if packets are throttled, fq set up an hrtimer that can
lead to one interrupt per packet in the throttled queue.

By using a timer slack, we allow better use of timer interrupts,
by giving them a chance to call multiple timer callbacks
at each hardware interrupt.

Also, giving a slack allows FQ to dequeue batches of packets
instead of a single one, thus increasing xmit_more efficiency.

This has no negative effect on the rate a TCP flow can sustain,
since each TCP flow maintains its own precise vtime (tp->tcp_wstamp_ns)

v2: added strict netlink checking (as feedback from Jakub Kicinski)

Tested:
 1000 concurrent flows all using paced packets.
 1,000,000 packets sent per second.

Before the patch :

$ vmstat 2 10
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0 60726784  23628 3485992    0    0   138     1  977  535  0 12 87  0  0
 0  0      0 60714700  23628 3485628    0    0     0     0 1568827 26462  0 22 78  0  0
 1  0      0 60716012  23628 3485656    0    0     0     0 1570034 26216  0 22 78  0  0
 0  0      0 60722420  23628 3485492    0    0     0     0 1567230 26424  0 22 78  0  0
 0  0      0 60727484  23628 3485556    0    0     0     0 1568220 26200  0 22 78  0  0
 2  0      0 60718900  23628 3485380    0    0     0    40 1564721 26630  0 22 78  0  0
 2  0      0 60718096  23628 3485332    0    0     0     0 1562593 26432  0 22 78  0  0
 0  0      0 60719608  23628 3485064    0    0     0     0 1563806 26238  0 22 78  0  0
 1  0      0 60722876  23628 3485236    0    0     0   130 1565874 26566  0 22 78  0  0
 1  0      0 60722752  23628 3484908    0    0     0     0 1567646 26247  0 22 78  0  0

After the patch, slack of 10 usec, we can see a reduction of interrupts
per second, and a small decrease of reported cpu usage.

$ vmstat 2 10
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 60722564  23628 3484728    0    0   133     1  696  545  0 13 87  0  0
 1  0      0 60722568  23628 3484824    0    0     0     0 977278 25469  0 20 80  0  0
 0  0      0 60716396  23628 3484764    0    0     0     0 979997 25326  0 20 80  0  0
 0  0      0 60713844  23628 3484960    0    0     0     0 981394 25249  0 20 80  0  0
 2  0      0 60720468  23628 3484916    0    0     0     0 982860 25062  0 20 80  0  0
 1  0      0 60721236  23628 3484856    0    0     0     0 982867 25100  0 20 80  0  0
 1  0      0 60722400  23628 3484456    0    0     0     8 982698 25303  0 20 80  0  0
 0  0      0 60715396  23628 3484428    0    0     0     0 981777 25176  0 20 80  0  0
 0  0      0 60716520  23628 3486544    0    0     0    36 978965 27857  0 21 79  0  0
 0  0      0 60719592  23628 3486516    0    0     0    22 977318 25106  0 20 80  0  0
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

qdisc_watchdog_schedule_range_ns() can use the newly added slack
and avoid rearming the hrtimer a bit earlier than the current
value. This patch has no effect if delta_ns parameter
is zero.

Note that this means the max slack is potentially doubled.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Some packet schedulers might want to add a slack
when programming hrtimers. This can reduce number
of interrupts and increase batch sizes and thus
give good xmit_more savings.

This commit adds qdisc_watchdog_schedule_range_ns()
helper, with an extra delta_ns parameter.

Legacy qdisc_watchdog_schedule_n() becomes an inline
passing a zero slack.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jakub Kicinski says:

====================
net: rename flow_action stats and set NFP type

Jiri, I hope this is okay with you, I just dropped the "type" from
the helper and value names, and now things should be able to fit
on a line, within 80 characters.

Second patch makes the NFP able to offload DELAYED stats, which
is the type it supports.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

NFP flower offload uses delayed stats. Kernel recently gained
the ability to specify stats types. Make nfp accept DELAYED
stats, not just the catch all "any".
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

flow_action_hw_stats_types_check() helper takes one of the
FLOW_ACTION_HW_STATS_*_BIT values as input. If we align
the arguments to the opening bracket of the helper there
is no way to call this helper and stay under 80 characters.

Remove the "types" part from the new flow_action helpers
and enum values.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Heiner Kallweit says:

====================
net: phy: improve phy_driver callback handle_interrupt

did_interrupt() clears the interrupt, therefore handle_interrupt() can
not check which event triggered the interrupt. To overcome this
constraint and allow more flexibility for customer interrupt handlers,
let's decouple handle_interrupt() from parts of the phylib interrupt
handling. Custom interrupt handlers now have to implement the
did_interrupt() functionality in handle_interrupt() if needed.

Fortunately we have just one custom interrupt handler so far (in the
mscc PHY driver), convert it to the changed API and make use of the
benefits.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Trigger the respective interrupt handler functionality only if the
related interrupt source bit is set.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

did_interrupt() clears the interrupt, therefore handle_interrupt() can
not check which event triggered the interrupt. To overcome this
constraint and allow more flexibility for customer interrupt handlers,
let's decouple handle_interrupt() from parts of the phylib interrupt
handling. Custom interrupt handlers now have to implement the
did_interrupt() functionality in handle_interrupt() if needed.

Fortunately we have just one custom interrupt handler so far (in the
mscc PHY driver), convert it to the changed API.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jakub Kicinski says:

====================
ethtool: consolidate irq coalescing - last part

Convert remaining drivers following the groundwork laid in a recent
patch set [1] and continued in [2], [3], [4], [5]. The aim of
the effort is to consolidate irq coalescing parameter validation
in the core.

This set is the sixth and last installment. It converts the remaining
8 drivers in drivers/net/ethernet. The last patch makes declaring
supported IRQ coalescing parameters a requirement.

[1] https://lore.kernel.org/netdev/20200305051542.991898-1-kuba@kernel.org/
[2] https://lore.kernel.org/netdev/20200306010602.1620354-1-kuba@kernel.org/
[3] https://lore.kernel.org/netdev/20200310021512.1861626-1-kuba@kernel.org/
[4] https://lore.kernel.org/netdev/20200311223302.2171564-1-kuba@kernel.org/
[5] https://lore.kernel.org/netdev/20200313040803.2367590-1-kuba@kernel.org/
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Now that all in-tree drivers have been updated we can
make the supported_coalesce_params mandatory.

To save debugging time in case some driver was missed
(or is out of tree) add a warning when netdev is registered
with set_coalesce but without supported_coalesce_params.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver already correctly rejected all unsupported
parameters. No functional changes.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver already correctly rejected all unsupported
parameters. No functional changes.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver did not previously reject unsupported parameters.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver did not previously reject unsupported parameters.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver did not previously reject unsupported parameters.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver already correctly rejected all unsupported
parameters.

While at it remove unnecessary zeroing on get.

No functional changes.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver did not previously reject unsupported parameters.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.

This driver did not previously reject unsupported parameters.
The check for use_adaptive_tx_coalesce will now be done by
the core.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pengcheng Yang says:

====================
tcp: fix stretch ACK bugs in congestion control modules

"stretch ACKs" (caused by LRO, GRO, delayed ACKs or middleboxes)
can cause serious performance shortfalls in common congestion
control algorithms. Neal Cardwell submitted a series of patches
starting with commit e73ebb08 ("tcp: stretch ACK fixes prep")
to handle stretch ACKs and fixed stretch ACK bugs in Reno and
CUBIC congestion control algorithms.

This patch series continues to fix bic, scalable, veno and yeah
congestion control algorithms to handle stretch ACKs.

Changes in v2:
- Provide [PATCH 0/N] to describe the modifications of this patch series
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Change Yeah to properly handle stretch ACKs in additive
increase mode by passing in the count of ACKed packets
to tcp_cong_avoid_ai().

In addition, we re-implemented the scalable path using
tcp_cong_avoid_ai() and removed the pkts_acked variable.
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Change Veno to properly handle stretch ACKs in additive
increase mode by passing in the count of ACKed packets
to tcp_cong_avoid_ai().
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

No code logic has been changed in this patch.
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Change Scalable to properly handle stretch ACKs in additive
increase mode by passing in the count of ACKed packets to
tcp_cong_avoid_ai().

In addition, because we are now precisely accounting for
stretch ACKs, including delayed ACKs, we can now change
TCP_SCALABLE_AI_CNT to 100.
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Changes BIC to properly handle stretch ACKs in additive
increase mode by passing in the count of ACKed packets
to tcp_cong_avoid_ai().
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

XDP-redirect is broken in this driver sfc. XDP_REDIRECT requires
tailroom for skb_shared_info when creating an SKB based on the
redirected xdp_frame (both in cpumap and veth).

The fix requires some initial explaining. The driver uses RX page-split
when possible. It reserves the top 64 bytes in the RX-page for storing
dma_addr (struct efx_rx_page_state). It also have the XDP recommended
headroom of XDP_PACKET_HEADROOM (256 bytes). As it doesn't reserve any
tailroom, it can still fit two standard MTU (1500) frames into one page.

The sizeof struct skb_shared_info in 320 bytes. Thus drivers like ixgbe
and i40e, reduce their XDP headroom to 192 bytes, which allows them to
fit two frames with max 1536 bytes into a 4K page (192+1536+320=2048).

The fix is to reduce this drivers headroom to 128 bytes and add the 320
bytes tailroom. This account for reserved top 64 bytes in the page, and
still fit two frame in a page for normal MTUs.

We must never go below 128 bytes of headroom for XDP, as one cacheline
is for xdp_frame area and next cacheline is reserved for metadata area.

Fixes: eb9a36be ("sfc: perform XDP processing on received packets")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Rearrange the config files for remoteproc and IPA to fix their
interdependencies.

First, have CONFIG_QCOM_Q6V5_MSS select QCOM_Q6V5_IPA_NOTIFY so the
notification code is built regardless of whether IPA needs it.

Next, represent QCOM_IPA as being dependent on QCOM_Q6V5_MSS rather
than setting its value to match QCOM_Q6V5_COMMON (which is selected
by QCOM_Q6V5_MSS).

Drop all dependencies from QCOM_Q6V5_IPA_NOTIFY.  The notification
code will be built whenever QCOM_Q6V5_MSS is set, and it has no other
dependencies.
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

This path fixes the suspicious RCU usage warning reported by
kernel test robot.

net/kcm/kcmproc.c:#RCU-list_traversed_in_non-reader_section

There is no need to use list_for_each_entry_rcu() in
kcm_stats_seq_show() as the list is always traversed under
knet->mutex held.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove set but not used variables 'sw_comp_cons' and 'hw_comp_cons'
to fix gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/qlogic/qede/qede_ethtool.c: In function qede_selftest_receive_traffic:
drivers/net/ethernet/qlogic/qede/qede_ethtool.c:1569:20:
 warning: variable sw_comp_cons set but not used [-Wunused-but-set-variable]
drivers/net/ethernet/qlogic/qede/qede_ethtool.c: In function qede_selftest_receive_traffic:
drivers/net/ethernet/qlogic/qede/qede_ethtool.c:1569:6:
 warning: variable hw_comp_cons set but not used [-Wunused-but-set-variable]

After removing 'hw_comp_cons',the memory barrier 'rmb()' and its comments become useless,
so remove them as well.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

For a single pedit action, multiple offload entries may be used. Set the
hw_stats_type to all of them.

Fixes: 44f86580 ("sched: act: allow user to specify type of HW stats for a filter")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Dejin Zheng says:

====================
net: stmmac: Use readl_poll_timeout() to simplify the code

This patch sets just for replace the open-coded loop to the
readl_poll_timeout() helper macro for simplify the code in
stmmac driver.

v2 -> v3:
	- return whatever error code by readl_poll_timeout() returned.
v1 -> v2:
	- no changed. I am a newbie and sent this patch a month
	  ago (February 6th). So far, I have not received any comments or
	  suggestion. I think it may be lost somewhere in the world, so
	  resend it.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

The dwmac4_dma_reset() function use an open coded of readl_poll_timeout().
Replace the open coded handling with the proper function.
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The init_systime() function use an open coded of readl_poll_timeout().
Replace the open coded handling with the proper function.
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>