dtschema defines label as string, so $ref in other bindings is
redundant.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jason Xing says:

====================
introduce drop reasons for tcp receive path

When I was debugging the reason about why the skb should be dropped in
syn cookie mode, I found out that this NOT_SPECIFIED reason is too
general. Thus I decided to refine it.

v10
Link: https://lore.kernel.org/netdev/20240223193321.6549-1-kuniyu@amazon.com/
1. fix three nit problems (Kuniyuki)
2. add reviewed-by tag (Kuniyuki)

v9
Link: https://lore.kernel.org/netdev/20240222113003.67558-1-kerneljasonxing@gmail.com/
1. nit: remove one unneeded 'else' (David)
2. add reviewed-by tags (Eric, David)

v8
Link: https://lore.kernel.org/netdev/20240221025732.68157-1-kerneljasonxing@gmail.com/
1. refine part of codes in patch [03/10] and patch [10/10] (Eric)
2. squash patch [11/11] in the last version into patch [10/11] (Eric)
3. add reviewed-by tags (Eric)

v7
Link: https://lore.kernel.org/all/20240219032838.91723-1-kerneljasonxing@gmail.com/
1. fix some misspelled problem (Kuniyuki)
2. remove redundant codes in tcp_v6_do_rcv() (Kuniyuki)
3. add reviewed-by tag in patch [02/11] (Kuniyuki)

v6
Link: https://lore.kernel.org/all/c987d2c79e4a4655166eb8eafef473384edb37fb.camel@redhat.com/
Link: https://lore.kernel.org/all/CAL+tcoAgSjwsmFnDh_Gs9ZgMi-y5awtVx+4VhJPNRADjo7LLSA@mail.gmail.com/
1. Take one case into consideration in tcp_v6_do_rcv(), behave like old
days, or else it will trigger errors (Paolo).
2. Extend NO_SOCKET reason to consider two more reasons for request
socket and child socket.

v5:
Link: https://lore.kernel.org/netdev/20240213134205.8705-1-kerneljasonxing@gmail.com/
Link: https://lore.kernel.org/netdev/20240213140508.10878-1-kerneljasonxing@gmail.com/
1. Use SKB_DROP_REASON_IP_OUTNOROUTES instead of introducing a new
   one (Eric, David)
2. Reuse SKB_DROP_REASON_NOMEM to handle failure of request socket
   allocation (Eric)
3. Reuse NO_SOCKET instead of introducing COOKIE_NOCHILD
4. avoid duplication of these opt_skb tests/actions (Eric)
5. Use new name (TCP_ABORT_ON_DATA) for readability (David)
6. Reuse IP_OUTNOROUTES instead of INVALID_DST (Eric)

---
HISTORY
This series is combined with 2 series sent before suggested by Jakub. So
I'm going to separately write changelogs for each of them.

PATCH 1/11 - 5/11
preivious Link: https://lore.kernel.org/netdev/20240213134205.8705-1-kerneljasonxing@gmail.com/
Summary
1. introduce all the dropreasons we need, [1/11] patch.
2. use new dropreasons in ipv4 cookie check, [2/11],[3/11] patch.
3. use new dropreasons ipv6 cookie check, [4/11],[5/11] patch.

v4:
Link: https://lore.kernel.org/netdev/20240212172302.3f95e454@kernel.org/
1. Fix misspelled name in Kdoc as suggested by Jakub.

v3:
Link: https://lore.kernel.org/all/CANn89iK40SoyJ8fS2U5kp3pDruo=zfQNPL-ppOF+LYaS9z-MVA@mail.gmail.com/
1. Split that patch into some smaller ones as suggested by Eric.

v2:
Link: https://lore.kernel.org/all/20240204104601.55760-1-kerneljasonxing@gmail.com/
1. change the title of 2/2 patch.
2. fix some warnings checkpatch tool showed before.
3. use return value instead of adding more parameters suggested by Eric.

PATCH 6/11 - 11/11
previous Link: https://lore.kernel.org/netdev/20240213140508.10878-1-kerneljasonxing@gmail.com/
v4:
Link: https://lore.kernel.org/netdev/CANn89iJar+H3XkQ8HpsirH7b-_sbFe9NBUdAAO3pNJK3CKr_bg@mail.gmail.com/
Link: https://lore.kernel.org/netdev/20240213131205.4309-1-kerneljasonxing@gmail.com/
Already got rid of @acceptable in tcp_rcv_state_process(), so I need to
remove *TCP_CONNREQNOTACCEPTABLE related codes which I wrote in the v3
series.

v3:
Link: https://lore.kernel.org/all/CANn89iK40SoyJ8fS2U5kp3pDruo=zfQNPL-ppOF+LYaS9z-MVA@mail.gmail.com/
1. Split that patch into some smaller ones as suggested by Eric.

v2:
Link: https://lore.kernel.org/all/20240204104601.55760-1-kerneljasonxing@gmail.com/
1. change the title of 2/2 patch.
2. fix some warnings checkpatch tool showed before.
3. use return value instead of adding more parameters suggested by Eric.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

It's time to let it work right now. We've already prepared for this:)
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Update three callers including both ipv4 and ipv6 and let the dropreason
mechanism work in reality.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In this patch, I equipped this function with more dropreasons, but
it still doesn't work yet, which I will do later.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch does two things:
1) add two more new reasons
2) only change the return value(1) to various drop reason values
for the future use

For now, we still cannot trace those two reasons. We'll implement the full
function in the subsequent patch in this series.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Soon later patches can use these relatively more accurate
reasons to recognise and find out the cause.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Like what I did to ipv4 mode, refine this part: adding more drop
reasons for better tracing.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Like previous patch does, only moving skb drop logical code to
cookie_v6_check() for later refinement.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Now it's time to use the prepared definitions to refine this part.
Four reasons used might enough for now, I think.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Only move the skb drop from tcp_v4_do_rcv() to cookie_v4_check() itself,
no other changes made. It can help us refine the specific drop reasons
later.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adding one drop reason to detect the condition of skb dropped
because of hook points in cookie check and extending NO_SOCKET
to consider another two cases can be used later.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch adds /proc/sys/net/core/mem_pcpu_rsv sysctl file,
to make SK_MEMORY_PCPU_RESERV tunable.

Commit 3cd3399d ("net: implement per-cpu reserves for
memory_allocated") introduced per-cpu forward alloc cache:

"Implement a per-cpu cache of +1/-1 MB, to reduce number
of changes to sk->sk_prot->memory_allocated, which
would otherwise be cause of false sharing."

sk_prot->memory_allocated points to global atomic variable:
atomic_long_t tcp_memory_allocated ____cacheline_aligned_in_smp;

If increasing the per-cpu cache size from 1MB to e.g. 16MB,
changes to sk->sk_prot->memory_allocated can be further reduced.
Performance may be improved on system with many cores.
Signed-off-by: Adam Li <adamli@os.amperecomputing.com>
Reviewed-by: Christoph Lameter (Ampere) <cl@linux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Luiz Angelo Daros de Luca says:

====================
net: dsa: realtek: support reset controller and update docs

The driver previously supported reset pins using GPIO, but it lacked
support for reset controllers. Although a reset method is generally not
required, the driver fails to detect the switch if the reset was kept
asserted by a previous driver.

This series adds support to reset a Realtek switch using a reset
controller. It also updates the binding documentation to remove the
requirement of a reset method and to add the new reset controller
property.

It was tested on a TL-WR1043ND v1 router (rtl8366rb via SMI).
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
---
Changes in v5:
- Fixed error checking logic when reset controller (de)assert fails
- Link to v4: https://lore.kernel.org/r/20240219-realtek-reset-v4-0-858b82a29503@gmail.com

Changes in v4:
- do not test for priv->reset,priv->reset_ctl
- updated commit message
- Link to v3: https://lore.kernel.org/r/20240213-realtek-reset-v3-0-37837e574713@gmail.com

Changes in v3:
- Rebased on the Realtek DSA driver refactoring (08f62716)
- Dropped the reset controller example in bindings
- Used %pe in error printing
- Linked to v2: https://lore.kernel.org/r/20231027190910.27044-1-luizluca@gmail.com/

Changes in v2:
- Introduced a dedicated commit for removing the reset-gpios requirement
- Placed binding patches before code changes
- Removed the 'reset-names' property
- Moved the example from the commit message to realtek.yaml
- Split the reset function into _assert/_deassert variants
- Modified reset functions to return a warning instead of a value
- Utilized devm_reset_control_get_optional to prevent failure when the
  reset control is missing
- Used 'true' and 'false' for boolean values
- Removed the CONFIG_RESET_CONTROLLER check as stub methods are
  sufficient when undefined
- Linked to v1: https://lore.kernel.org/r/20231024205805.19314-1-luizluca@gmail.com/
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for resetting the device using a reset controller,
complementing the existing GPIO reset functionality (reset-gpios).

Although the reset is optional and the driver performs a soft reset
during setup, if the initial reset pin state was asserted, the driver
will not detect the device until the reset is deasserted.
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Realtek switches can use a reset controller instead of reset-gpios.
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Cc: devicetree@vger.kernel.org
Acked-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The 'reset-gpios' should not be mandatory. although they might be
required for some devices if the switch reset was left asserted by a
previous driver, such as the bootloader.
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Cc: devicetree@vger.kernel.org
Acked-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace macro MAC_ADDRESS_EQUAL() for null_mac_addr checking with inline
function__agg_has_partner(). When MAC_ADDRESS_EQUAL() is verifiying
aggregator's partner mac addr with null_mac_addr, means that seeing if
aggregator has a valid partner or not. Using __agg_has_partner() makes it
more clear to understand.

In ad_port_selection_logic(), since aggregator->partner_system and
port->partner_oper.system has been compared first as a prerequisite, it is
safe to replace the upcoming MAC_ADDRESS_EQUAL() for null_mac_addr checking
with __agg_has_partner().

Delete null_mac_addr, which is not required anymore in bond_3ad.c, since
all references to it are gone.
Signed-off-by: Jones Syue <jonessyue@qnap.com>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Link: https://lore.kernel.org/r/SI2PR04MB5097BCA8FF2A2F03D9A5A3EEDC5A2@SI2PR04MB5097.apcprd04.prod.outlook.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

This is an effort to get rid of all multiplications from allocation
functions in order to prevent integer overflows [1][2].

As the "port_prox" variable is a pointer to "struct port_proxy" and
this structure ends in a flexible array:

struct port_proxy {
	[...]
	struct t7xx_port ports[];
};

the preferred way in the kernel is to use the struct_size() helper to
do the arithmetic instead of the argument "size + size * count" in the
devm_kzalloc() function.

This way, the code is more readable and safer.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
Link: https://github.com/KSPP/linux/issues/160 [2]
Signed-off-by: Erick Archer <erick.archer@gmx.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Link: https://lore.kernel.org/r/20240224181932.2720-1-erick.archer@gmx.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The input parameter 'opt' in rawv6_err() is not used. Therefore, remove it.
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240224084121.2479603-1-shaozhengchao@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

This is a followup of commit 234ec0b6 ("netlink: fix potential
sleeping issue in mqueue_flush_file"), because vfree_atomic()
overhead is unfortunate for medium sized allocations.

1) If the allocation is smaller than PAGE_SIZE, do not bother
   with vmalloc() at all. Some arches have 64KB PAGE_SIZE,
   while NLMSG_GOODSIZE is smaller than 8KB.

2) Use kvmalloc(), which might allocate one high order page
   instead of vmalloc if memory is not too fragmented.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Zhengchao Shao <shaozhengchao@huawei.com>
Link: https://lore.kernel.org/r/20240224090630.605917-1-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

bnxt_alloc_mem() dereferences ::vnic_info in the variable declaration
block, but allocates it much later. As a result, the following crash
happens on my setup:

 BUG: kernel NULL pointer dereference, address: 0000000000000090
 fbcon: Taking over console
 #PF: supervisor write access in kernel mode
 #PF: error_code (0x0002) - not-present page
 PGD 12f382067 P4D 0
 Oops: 8002 [#1] PREEMPT SMP NOPTI
 CPU: 47 PID: 2516 Comm: NetworkManager Not tainted 6.8.0-rc5-libeth+ #49
 Hardware name: Intel Corporation M50CYP2SBSTD/M58CYP2SBSTD, BIOS SE5C620.86B.01.01.0088.2305172341 05/17/2023
 RIP: 0010:bnxt_alloc_mem+0x1609/0x1910 [bnxt_en]
 Code: 81 c8 48 83 c8 08 31 c9 e9 d7 fe ff ff c7 44 24 Oc 00 00 00 00 49 89 d5 e9 2d fe ff ff 41 89 c6 e9 88 00 00 00 48 8b 44 24 50 <80> 88 90 00 00 00 Od 8b 43 74 a8 02 75 1e f6 83 14 02 00 00 80 74
 RSP: 0018:ff3f25580f3432c8 EFLAGS: 00010246
 RAX: 0000000000000000 RBX: ff15a5cfc45249e0 RCX: 0000002079777000
 RDX: ff15a5dfb9767000 RSI: 0000000000000000 RDI: 0000000000000000
 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
 R10: ff15a5dfb9777000 R11: ffffff8000000000 R12: 0000000000000000
 R13: 0000000000000000 R14: 0000000000000020 R15: ff15a5cfce34f540
 FS:  000007fb9a160500(0000) GS:ff15a5dfbefc0000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CRO: 0000000080050033
 CR2: 0000000000000090 CR3: 0000000109efc00Z CR4: 0000000000771ef0
 DR0: 0000000000000000 DR1: 0000000000000000 DRZ: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 PKRU: 55555554

 Call Trace:
 <TASK>
 ? __die_body+0x68/0xb0
 ? page_fault_oops+0x3a6/0x400
 ? exc_page_fault+0x7a/0x1b0
 ? asm_exc_page_fault+0x26/8x30
 ? bnxt_alloc_mem+0x1609/0x1910 [bnxt_en]
 ? bnxt_alloc_mem+0x1389/8x1918 [bnxt_en]
 _bnxt_open_nic+0x198/0xa50 [bnxt_en]
 ? bnxt_hurm_if_change+0x287/0x3d0 [bnxt_en]
 bnxt_open+0xeb/0x1b0 [bnxt_en]
 _dev_open+0x12e/0x1f0
 _dev_change_flags+0xb0/0x200
 dev_change_flags+0x25/0x60
 do_setlink+0x463/0x1260
 ? sock_def_readable+0x14/0xc0
 ? rtnl_getlink+0x4b9/0x590
 ? _nla_validate_parse+0x91/0xfa0
 rtnl_newlink+0xbac/0xe40
 <...>

Don't create a variable and dereference the first array member directly
since it's used only once in the code.

Fixes: ef4ee64e ("bnxt_en: Define BNXT_VNIC_DEFAULT for the default vnic index")
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20240226144911.1297336-1-aleksander.lobakin@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Commit 6151ff9c ("selftests: netdevsim: use suitable existing dummy
file for flash test") introduced a nice trick to the devlink flashing
test. Instead of user having to create a file under /lib/firmware
we just pick the first one that already exists.

Sadly, in AWS Linux there are no files directly under /lib/firmware,
only in subdirectories. Don't limit the search to -maxdepth 1.
We can use the %P print format to get the correct path for files
inside subdirectories:

$ find /lib/firmware -type f -printf '%P\n' | head -1
intel-ucode/06-1a-05

The full path is /lib/firmware/intel-ucode/06-1a-05

This works in GNU find, busybox doesn't have printf at all,
so we're not making it worse.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240224050658.930272-1-kuba@kernel.orgSigned-off-by: Paolo Abeni <pabeni@redhat.com>

The MMC IPC interrupt status and interrupt mask registers are
of little use as Ethernet statistics, but incrementing counters
based on the current interrupt and interrupt mask registers
makes them actively misleading.

For example, if the interrupt mask is set to 0x08420842,
the current code will increment by that amount each iteration,
leading to the following sequence of nonsense:

mmc_rx_ipc_intr_mask: 969816526
mmc_rx_ipc_intr_mask: 1108361744

These registers have been included in the Ethernet statistics
since the first version of MMC back in 2011 (commit 1c901a46).
That commit also mentions the MMC interrupts as
"something to add later (if actually useful)".

If the registers are actually useful, they should probably
be part of the Ethernet register dump instead of statistics,
but for now, drop the counters for mmc_rx_ipc_intr and
mmc_rx_ipc_intr_mask completely.
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240223-stmmac_stats-v3-1-5d483c2a071a@axis.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

In order to do a clause 22 access to the PHY registers of the ADIN1110,
we have to write the MDIO frame to the ADIN1110_MDIOACC register, and
then poll the MDIO_TRDONE bit (for a 1) in the same register. The
device will set this bit to 1 once the internal MDIO transaction is
done. In practice, this bit takes ~50 - 60 us to be set.

The first attempt to poll the bit is right after the ADIN1110_MDIOACC
register is written, so it will always be read as 0. The next check will
only be done after 10 ms, which will result in the MDIO transactions
taking a long time to complete. Reduce this polling interval to 100 us.
Since this interval is short enough, switch the poll function to
readx_poll_timeout_atomic() instead.
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Ciprian Regus <ciprian.regus@analog.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240223162129.154114-1-ciprian.regus@analog.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Alex Elder says:

====================
net: ipa: don't abort system suspend

Currently the IPA code aborts an in-progress system suspend if an
IPA interrupt arrives before the suspend completes.  There is no
need to do that though, because the IPA driver handles a forced
suspend correctly, quiescing any hardware activity before finally
turning off clocks and interconnects.

This series drops the call to pm_wakeup_dev_event() if an IPA
SUSPEND interrupt arrives during system suspend.  Doing this
makes the two remaining IPA power flags unnecessary, and allows
some additional code to be cleaned up--and best of all, removed.
The result is much simpler (and I'm really glad not to be using
these flags any more).

The first patch implements the main change.  The second and
third remove the flags that were used to determine whether to
call pm_wakeup_dev_event().  The next two remove a function that
becomes a trivial wrapper, and the last one just avoids writing
a register unnecessarily.

Note that the first two patches will have checkpatch warnings,
because checkpatch disagrees with my compiler on what to do when
a block contains only a semicolon.  I went with what the compiler
recommends.

clang says: warning: suggest braces around empty body
checkpatch: WARNING: braces {} are not necessary for single statement blocks

====================

Link: https://lore.kernel.org/r/20240223133930.582041-1-elder@linaro.orgSigned-off-by: Paolo Abeni <pabeni@redhat.com>

In ipa_interrupt_suspend_clear_all(), if the SUSPEND_INFO register
read contains no set bits, there's no interrupt condition to clear.
Skip the write to the clear register in that case.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Now that ipa_power_suspend_handler() is a trivial wrapper around
ipa_interrupt_suspend_clear_all(), we can open-code it in the one
place it's used, and get rid of the function.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

The next patch makes ipa_interrupt_suspend_clear_all() static,
calling it only within "ipa_interrupt.c".  Move its definition
higher in the file so no declaration is needed.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

The IPA_POWER_FLAG_RESUMED was originally used to avoid calling
pm_wakeup_dev_event() more than once when handling a SUSPEND
interrupt.  This call is no longer made, so there' no need for the
flag, so get rid of it.

That leaves no more IPA power flags usefully defined, so just get
rid of the bitmap in the IPA power structure and the definition of
the ipa_power_flag enumerated type.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

The SYSTEM IPA power flag is set, cleared, and tested.  But nothing
happens based on its value when tested, so it serves no purpose.
Get rid of this flag.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

The IPA interrupt can fire if there is data to be delivered to a GSI
channel that is suspended.  This condition occurs in three scenarios.

First, runtime power management automatically suspends the IPA
hardware after half a second of inactivity.  This has nothing
to do with system suspend, so a SYSTEM IPA power flag is used to
avoid calling pm_wakeup_dev_event() when runtime suspended.

Second, if the system is suspended, the receipt of an IPA interrupt
should trigger a system resume.  Configuring the IPA interrupt for
wakeup accomplishes this.

Finally, if system suspend is underway and the IPA interrupt fires,
we currently call pm_wakeup_dev_event() to abort the system suspend.

The IPA driver correctly handles quiescing the hardware before
suspending it, so there's really no need to abort a suspend in
progress in the third case.  We can simply quiesce and suspend
things, and be done.

Incoming data can still wake the system after it's suspended.
The IPA interrupt has wakeup mode enabled, so if it fires *after*
we've suspended, it will trigger a wakeup (if not disabled via
sysfs).

Stop calling pm_wakeup_dev_event() to abort a system suspend in
progress in ipa_power_suspend_handler().
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Simplify the function, no functional change intended.

- Remove not needed variable unsupp, I think code is even better
  readable now.
- Move setting phydev->eee_enabled out of the if clause
- Simplify return value handling
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/442277c7-7431-4542-80b5-1d3d691714d7@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Matthieu Baerts says:

====================
mptcp: various small improvements

This series brings various small improvements to MPTCP and its
selftests:

Patch 1 prints an error if there are duplicated subtests names. It is
important to have unique (sub)tests names in TAP, because some CI
environments drop (sub)tests with duplicated names.

Patch 2 is a preparation for patches 3 and 4, which check the protocol
in tcp_sk() and mptcp_sk() with DEBUG_NET, only in code from net/mptcp/.
We recently had the case where an MPTCP socket was wrongly treated as a
TCP one, and fuzzers and static checkers never spot the issue. This
would prevent such issues in the future.

Patches 5 to 7 are some cleanup for the MPTCP selftests. These patches
are not supposed to change the behaviour.

Patch 8 sets the poll timeout in diag selftest to the same value as the
one used in the other selftests.
====================

Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-0-b6c8a10396bd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Even if it is set to 100ms from the beginning with commit
df62f2ec ("selftests/mptcp: add diag interface tests"), there is
no reason not to have it to 30ms like all the other tests. "diag.sh" is
not supposed to be slower than the other ones.

To maintain consistency with other scripts, this patch changes it to 30.
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-8-b6c8a10396bd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

To maintain consistency with other scripts, this patch changes vars
'capture' and 'checksum' as bool vars in mptcp_join.
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-7-b6c8a10396bd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The variables 'large', 'small', 'sout', 'cout', 'capout' and 'size' are
used in multiple functions, so they should be clearly defined as global
variables at the top of the file.

This patch redefines them at the beginning of simult_flows.sh.
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-6-b6c8a10396bd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The variable 'ret' are defined twice in pm_netlink.sh. This patch drops
this duplicate one that has been defined from the beginning, with
commit eedbc685 ("selftests: add PM netlink functional tests")
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-5-b6c8a10396bd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Fuzzers and static checkers might not detect when mptcp_sk() is used
with a non mptcp_sock structure.

This is similar to the parent commit, where it is easy to use mptcp_sk()
with a TCP sock, e.g. with a subflow sk.

So a new simple check is done when CONFIG_DEBUG_NET is enabled to tell
kernel devs when a non-MPTCP socket is being used as an MPTCP one.
'mptcp_sk()' macro is then defined differently: with an extra WARN to
complain when an unexpected socket is being used.
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-4-b6c8a10396bd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Fuzzers and static checkers might not detect when tcp_sk() is used with
a non tcp_sock structure.

This kind of mistake already happened a few times with MPTCP: when
wrongly using TCP-specific helpers with mptcp_sock pointers. On the
other hand, there are many 'tcp_xxx()' helpers that are taking a 'struct
sock' pointer as arguments, and some of them are only looking at fields
from 'struct sock', and nothing from 'struct tcp_sock'. It is then
tempting to use them with a 'struct mptcp_sock'.

So a new simple check is done when CONFIG_DEBUG_NET is enabled to tell
kernel devs when a non-TCP socket is being used as a TCP one. 'tcp_sk()'
macro is then re-defined to add a WARN when an unexpected socket is
being used.
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-3-b6c8a10396bd@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>