Some return variables are never changed until function returned.
These variables are unneeded for their functions. Therefore, the
unneeded return variables can be removed safely by returning their
initial values.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a documentation entry for the DPAA2 switch listing its
requirements, features and some examples to go along them.
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Mark Gray says:

====================
openvswitch: per-cpu upcall patchwork issues

Some issues were raised by patchwork at:
https://patchwork.kernel.org/project/netdevbpf/patch/20210630095350.817785-1-mark.d.gray@redhat.com/#24285159
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

fix incorrect type in argument 1 (different address spaces)

../net/openvswitch/datapath.c:169:17: warning: incorrect type in argument 1 (different address spaces)
../net/openvswitch/datapath.c:169:17:    expected void const *
../net/openvswitch/datapath.c:169:17:    got struct dp_nlsk_pids [noderef] __rcu *upcall_portids

Found at: https://patchwork.kernel.org/project/netdevbpf/patch/20210630095350.817785-1-mark.d.gray@redhat.com/#24285159Signed-off-by: Mark Gray <mark.d.gray@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Mark Gray <mark.d.gray@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Mark Gray <mark.d.gray@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the case when nlh is NULL in nlmsg_report(),
so that the caller doesn't need to deal with this case.
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently, all drivers depend on the bool CONFIG_NET_SWITCHDEV, but only
the drivers that call some sort of function exported by the bridge, like
br_vlan_enabled() or whatever, have an extra dependency on CONFIG_BRIDGE.

Since the blamed commit, all switchdev drivers have a functional
dependency upon switchdev_bridge_port_{,un}offload(), which is a pair of
functions exported by the bridge module and not by the bridge-independent
part of CONFIG_NET_SWITCHDEV.

Problems appear when we have:

CONFIG_BRIDGE=m
CONFIG_NET_SWITCHDEV=y
CONFIG_TI_CPSW_SWITCHDEV=y

because cpsw, am65_cpsw and sparx5 will then be built-in but they will
call a symbol exported by a loadable module. This is not possible and
will result in the following build error:

drivers/net/ethernet/ti/cpsw_new.o: in function `cpsw_netdevice_event':
drivers/net/ethernet/ti/cpsw_new.c:1520: undefined reference to
					`switchdev_bridge_port_offload'
drivers/net/ethernet/ti/cpsw_new.c:1537: undefined reference to
					`switchdev_bridge_port_unoffload'

As mentioned, the other switchdev drivers don't suffer from this because
switchdev_bridge_port_offload() is not the first symbol exported by the
bridge that they are calling, so they already needed to deal with this
in the same way.

Fixes: 2f5dc00f ("net: bridge: switchdev: let drivers inform which bridge ports are offloaded")
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In the cited commit, copy_to_user() got called with the wrong pointer,
instead of passing the actual buffer ptr to copy from, a pointer to
the pointer got passed, which causes a buffer overflow calltrace to pop
up when executing "ethtool -x ethX".

Fix ethtool_rxnfc_copy_to_user() to use the rxnfc pointer as passed
to the function, instead of a pointer to it.

This fixes below call trace:
[   15.533533] ------------[ cut here ]------------
[   15.539007] Buffer overflow detected (8 < 192)!
[   15.544110] WARNING: CPU: 3 PID: 1801 at include/linux/thread_info.h:200 copy_overflow+0x15/0x20
[   15.549308] Modules linked in:
[   15.551449] CPU: 3 PID: 1801 Comm: ethtool Not tainted 5.14.0-rc2+ #1058
[   15.553919] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[   15.558378] RIP: 0010:copy_overflow+0x15/0x20
[   15.560648] Code: e9 7c ff ff ff b8 a1 ff ff ff eb c4 66 0f 1f 84 00 00 00 00 00 55 48 89 f2 89 fe 48 c7 c7 88 55 78 8a 48 89 e5 e8 06 5c 1e 00 <0f> 0b 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 55
[   15.565114] RSP: 0018:ffffad49c0523bd0 EFLAGS: 00010286
[   15.566231] RAX: 0000000000000000 RBX: 00000000000000c0 RCX: 0000000000000000
[   15.567616] RDX: 0000000000000001 RSI: ffffffff8a7912e7 RDI: 00000000ffffffff
[   15.569050] RBP: ffffad49c0523bd0 R08: ffffffff8ab2ae28 R09: 00000000ffffdfff
[   15.570534] R10: ffffffff8aa4ae40 R11: ffffffff8aa4ae40 R12: 0000000000000000
[   15.571899] R13: 00007ffd4cc2a230 R14: ffffad49c0523c00 R15: 0000000000000000
[   15.573584] FS:  00007f538112f740(0000) GS:ffff96d5bdd80000(0000) knlGS:0000000000000000
[   15.575639] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.577092] CR2: 00007f5381226d40 CR3: 0000000013542000 CR4: 00000000001506e0
[   15.578929] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   15.580695] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   15.582441] Call Trace:
[   15.582970]  ethtool_rxnfc_copy_to_user+0x30/0x46
[   15.583815]  ethtool_get_rxnfc.cold+0x23/0x2b
[   15.584584]  dev_ethtool+0x29c/0x25f0
[   15.585286]  ? security_netlbl_sid_to_secattr+0x77/0xd0
[   15.586728]  ? do_set_pte+0xc4/0x110
[   15.587349]  ? _raw_spin_unlock+0x18/0x30
[   15.588118]  ? __might_sleep+0x49/0x80
[   15.588956]  dev_ioctl+0x2c1/0x490
[   15.589616]  sock_ioctl+0x18e/0x330
[   15.591143]  __x64_sys_ioctl+0x41c/0x990
[   15.591823]  ? irqentry_exit_to_user_mode+0x9/0x20
[   15.592657]  ? irqentry_exit+0x33/0x40
[   15.593308]  ? exc_page_fault+0x32f/0x770
[   15.593877]  ? exit_to_user_mode_prepare+0x3c/0x130
[   15.594775]  do_syscall_64+0x35/0x80
[   15.595397]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   15.596037] RIP: 0033:0x7f5381226d4b
[   15.596492] Code: 0f 1e fa 48 8b 05 3d b1 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 0d b1 0c 00 f7 d8 64 89 01 48
[   15.598743] RSP: 002b:00007ffd4cc2a1f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   15.599804] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5381226d4b
[   15.600795] RDX: 00007ffd4cc2a350 RSI: 0000000000008946 RDI: 0000000000000003
[   15.601712] RBP: 00007ffd4cc2a340 R08: 00007ffd4cc2a350 R09: 0000000000000001
[   15.602751] R10: 00007f538128a990 R11: 0000000000000246 R12: 0000000000000000
[   15.603882] R13: 00007ffd4cc2a350 R14: 00007ffd4cc2a4b0 R15: 0000000000000000
[   15.605042] ---[ end trace 325cf185e2795048 ]---

Fixes: dd98d289 ("ethtool: improve compat ioctl handling")
Reported-by: Shannon Nelson <snelson@pensando.io>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Christoph Hellwig <hch@lst.de>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Tested-by: Shannon Nelson <snelson@pensando.io>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Alex Elder says:

====================
net: ipa: defer taking uC proxy clock

This series rearranges some of the IPA initialization code.

The first patch gets rid of two trivial setup and teardown
functions, open-coding them in their callers instead.

The second patch has memory regions get configured before endpoints.

IPA interrupts do not depend on GSI being initialized.  Therefore
they can be initialized in the config phase rather than waiting for
setup.  The third patch moves this initialization earlier; memory
regions must already be defined, so it's done after memory config.

The microcontroller also has no dependency on GSI, though it does
require IPA interrupts to be configured.  The fourth patch moves
microcontroller initialization so it too happens during the config
phase rather than setup.

Finally, we currently take a "proxy clock" for the microcontroller
during the config phase, dropping it only after we learn the
microcontroller is initialized.  But microcontroller initialization
is started by the modem, so there's no point in taking that clock
reference before we know the modem has booted.  So the last patch
arranges to wait to take the "proxy clock" for the microcontroller
until we know the modem is about to boot.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

The first time it's booted, the modem loads and starts the
IPA-resident microcontroller.  Once the microcontroller has
completed its initialization, it notifies the AP it's "ready"
by sending an INIT_COMPLETED response message.

Until it receives that microcontroller message, the AP must ensure
the IPA core clock remains operational.  Currently, a "proxy" clock
reference is taken in ipa_uc_config(), dropping it again once the
message is received.

However there could be a long delay between when ipa_config()
completes and when modem actually starts.  And because the
microcontroller gets loaded by the modem, there's no need to
get the modem "proxy clock" until the first time it starts.

Create a new function ipa_uc_clock() which takes the "proxy" clock
reference for the microcontroller.  Call it when we get remoteproc
SSR notification that the modem is about to start.  Keep an
additional flag to record whether this proxy clock reference needs
to be dropped at shutdown time, and issue a warning if we get the
microcontroller message either before the clock reference is taken,
or after it has already been dropped.

Drop the nearby use of "hh" length modifiers, which are no longer
encouraged in the kernel.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Initializing up the IPA-resident microcontroller requires the IPA
clock, and sets up two IPA interrupt handlers, but this does not
require GSI access.  The interrupt handlers also require the clock
to be enabled, and require the IPA memory regions to be configured,
but neither requires GSI access.  As a result, the microcontroller
can be initialized during the "config" rather than "setup" phase of
IPA initialization.

Initialize the microcontroller in ipa_config() rather than
ipa_setup(), and rename the called function ipa_uc_config().
Do the inverse in ipa_deconfig() rather than ipa_teardown(),
and rename the function for that case ipa_uc_deconfig().
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Initialization of the IPA driver has several phases:
   - "init" phase can be done without any access to IPA hardware
   - "config" phase requires the IPA hardware to be clocked
   - "setup" phase requires the GSI layer to be functional

Currently, initialization for the IPA interrupt handling code occurs
in the setup phase.  It requires access to the IPA hardware but does
not need GSI, so it can be moved to the config phase instead.

Call the interrupt configuration function early in ipa_config()
rather than from ipa_setup().  Rename ipa_interrupt_setup() to be
ipa_interrupt_config(), and ipa_interrupt_teardown() to be
ipa_interupt_deconfig(), so their names properly indicate when
they get called.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

IPA-resident memory is one of the most primitive resources that
needs initialization, so call init_mem_config() early in
ipa_config().

This is in preparation for initializing the IPA-resident
microcontroller earlier.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The functions ipa_modem_setup() and ipa_modem_teardown() are trivial
wrappers that call ipa_qmi_setup() and ipa_qmi_teardown().  Just
call the QMI functions directly, and get rid of the wrappers.

Improve the documentation of what setting up QMI does.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix the following out-of-bounds warnings:

    net/core/flow_dissector.c: In function '__skb_flow_dissect':
>> net/core/flow_dissector.c:1104:4: warning: 'memcpy' offset [24, 39] from the object at '<unknown>' is out of the bounds of referenced subobject 'saddr' with type 'struct in6_addr' at offset 8 [-Warray-bounds]
     1104 |    memcpy(&key_addrs->v6addrs, &iph->saddr,
          |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     1105 |           sizeof(key_addrs->v6addrs));
          |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    In file included from include/linux/ipv6.h:5,
                     from net/core/flow_dissector.c:6:
    include/uapi/linux/ipv6.h:133:18: note: subobject 'saddr' declared here
      133 |  struct in6_addr saddr;
          |                  ^~~~~
>> net/core/flow_dissector.c:1059:4: warning: 'memcpy' offset [16, 19] from the object at '<unknown>' is out of the bounds of referenced subobject 'saddr' with type 'unsigned int' at offset 12 [-Warray-bounds]
     1059 |    memcpy(&key_addrs->v4addrs, &iph->saddr,
          |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     1060 |           sizeof(key_addrs->v4addrs));
          |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    In file included from include/linux/ip.h:17,
                     from net/core/flow_dissector.c:5:
    include/uapi/linux/ip.h:103:9: note: subobject 'saddr' declared here
      103 |  __be32 saddr;
          |         ^~~~~

The problem is that the original code is trying to copy data into a
couple of struct members adjacent to each other in a single call to
memcpy().  So, the compiler legitimately complains about it. As these
are just a couple of members, fix this by copying each one of them in
separate calls to memcpy().

This helps with the ongoing efforts to globally enable -Warray-bounds
and get us closer to being able to tighten the FORTIFY_SOURCE routines
on memcpy().

Link: https://github.com/KSPP/linux/issues/109Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/d5ae2e65-1f18-2577-246f-bada7eee6ccd@intel.com/Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix the following out-of-bounds warning:

    In function 'ip_copy_addrs',
        inlined from '__ip_queue_xmit' at net/ipv4/ip_output.c:517:2:
net/ipv4/ip_output.c:449:2: warning: 'memcpy' offset [40, 43] from the object at 'fl' is out of the bounds of referenced subobject 'saddr' with type 'unsigned int' at offset 36 [-Warray-bounds]
      449 |  memcpy(&iph->saddr, &fl4->saddr,
          |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      450 |         sizeof(fl4->saddr) + sizeof(fl4->daddr));
          |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The problem is that the original code is trying to copy data into a
couple of struct members adjacent to each other in a single call to
memcpy(). This causes a legitimate compiler warning because memcpy()
overruns the length of &iph->saddr and &fl4->saddr. As these are just
a couple of struct members, fix this by using direct assignments,
instead of memcpy().

This helps with the ongoing efforts to globally enable -Warray-bounds
and get us closer to being able to tighten the FORTIFY_SOURCE routines
on memcpy().

Link: https://github.com/KSPP/linux/issues/109Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/d5ae2e65-1f18-2577-246f-bada7eee6ccd@intel.com/Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The RMNet and IPA drivers both support inline checksum offload now.
So enable it for the TX and RX modem endoints for IPA version 4.5+.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Alex Elder says:

====================
net: ipa: kill IPA_VALIDATION

A few months ago I proposed cleaning up some code that validates
certain things conditionally, arguing that doing so once is enough,
thus doing so always should not be necessary.
  https://lore.kernel.org/netdev/20210320141729.1956732-1-elder@linaro.org/
Leon Romanovsky felt strongly that this was a mistake, and in the
end I agreed to change my plans.

This series finally completes what I said I would do about this,
ultimately eliminating the IPA_VALIDATION symbol and conditional
code entirely.

The first patch both extends and simplifies some validation done for
IPA immediate commands, and performs those tests unconditionally.

The second patch fixes a bug that wasn't normally exposed because of
the conditional compilation (a reason Leon was right about this).
It makes filter and routing table validation occur unconditionally.

The third eliminates the remaining conditionally-defined code and
removes the line in the Makefile used to enable validation.

And the fourth removes all comments containing ipa_assert()
statements, replacing most of them with WARN_ON() calls.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

I've added commented assertions to record certain properties that
can be assumed to hold in certain places in the IPA code.  Convert
these into real WARN_ON() calls so the assertions are actually
checked, using the standard WARN_ON() mechanism.

Where errors can be returned, return an error if a warning is
triggered.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

There are only a few remaining spots that validate IPA code
conditional on whether a symbol is defined at compile time.
The checks are not expensive, so just build them always.

This completes the removal of all CONFIG_VALIDATE/CONFIG_VALIDATION
IPA code.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

All checks in ipa_table_validate_build() are computed at build time,
so build that unconditionally.

In ipa_table_valid() calls to ipa_table_valid_one() are missing the
IPA pointer parameter is missing in (a bug that shows up only when
IPA_VALIDATE is defined).  Don't bother checking whether hashed
table memory regions are valid if hashed tables are not supported.

With those things fixed, have these table validation functions built
unconditionally (not dependent on IPA_VALIDATE).
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Stop supporting different sizes for hashed and non-hashed filter or
route tables.  Add BUILD_BUG_ON() calls to verify the sizes of the
fields in the filter/route table initialization immediate command
are the same.

Add a check to ipa_cmd_table_valid() to ensure the size of the
memory region being checked fits within the immediate command field
that must hold it.

Remove two Boolean parameters used only for error reporting.  This
actually fixes a bug that would only show up if IPA_VALIDATE were
defined.  Define ipa_cmd_table_valid() unconditionally (no longer
dependent on IPA_VALIDATE).
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Vladimir Oltean says:

====================
Traffic termination for sja1105 ports under VLAN-aware bridge

This set of patches updates the sja1105 DSA driver to be able to send
and receive network stack packets on behalf of a VLAN-aware upper bridge
interface.

The reasons why this has traditionally been a problem are explained in
the "Traffic support" section of Documentation/networking/dsa/sja1105.rst.
(the entire documentation will be revised in a separate patch series).

The limitations that have prevented us from doing this so far have now
been partially lifted by the bridge's ability to send a packet with
skb->offload_fwd_mark = true, which means that the accelerator is
allowed to look up its hardware FDB when sending a packet and deliver it
to those destination ports. Basically skb->dev is now just a conduit to
the switchdev driver's ndo_start_xmit(), and does not guarantee that the
packet will really be transmitted on that port (but it will be
transmitted where it should, nonetheless).

Apart from the ability to perform IP termination on VLAN-aware bridges
on top of sja1105 interfaces, we also gain the following features:
- VLAN-aware software bridging between sja1105 ports and "foreign"
  (non-DSA) interfaces
- software bridging between sja1105 bridge ports, and software LAG
  uppers of sja1105 ports (as long as the bridge is VLAN-aware)

The only things that don't work are:
1. to create an AF_PACKET socket on top of a sja1105 port that is under
   a VLAN-aware bridge. This is because the "imprecise RX" procedure
   selects an RX port for data plane* packets based on the assumption
   that the packet will land in the bridge's data path.  If ebtables
   rules are added to remove some packets from the bridge's data path,
   that assumption will be broken. Nonetheless, this is not a limitation
   that negatively impacts the known use cases with this switch.  If
   there was a way to impose user space restrictions against creating
   AF_PACKET sockets on this particular configuration, I could be
   interested in adding those restrictions, but I think there are other
   known broken configs already which are not checked by the kernel
   today (like for example that the bridge's rx_handler steals packets
   anyway from AF_PACKET sockets with exact-match ptype handlers, as
   opposed to ptype_all which are processed earlier; this is precisely
   the reason why ebtables rules are generally needed to avoid that).
2. to send traffic on behalf of an 8021q upper of a standalone interface,
   while other sja1105 ports are part of a VLAN-aware bridge. This is
   because sja1105 sets ds->vlan_filtering_is_global = true, so we
   cannot make the standalone port ignore the VLAN header from the
   packet on RX, so we cannot make tag_8021q enforce its own pvid for
   the packets belonging to that port's 8021q upper. So we cannot
   determine in the first place that packets come from that port, unless
   we iterate through all 8021q uppers of all ports, and enforce
   uniqueness of VLAN IDs. I am not sure if this is what I want / if it
   is worth it, so currently all 8021q uppers are denied, regardless of
   whether the switch has ports under a VLAN-aware bridge or not
   (otherwise it becomes complicated even to track the state).
   Nonetheless, the VID uniqueness of all 8021q uppers does raise
   another question: what to do with VID 0, which has no 8021q upper,
   but the 8021q module adds it to our RX filter with vlan_vid_add().
   I am honestly not sure what to do. The best I can do is enable a
   hardware bit in sja1105 which reclassifies VID 0 frames to the PVID,
   and they will be sent on the CPU port using either the tag_8021q pvid
   of standalone ports, or the bridge pvid of VLAN-aware ports. So at
   the very least, those packets are still 'kinda' processed as if they
   were untagged, but the VID 0 is lost, though. In my defence, Marvell
   appears to do the same thing with reclassifying VID 0 frames, see
   commit b8b79c41 ("net: dsa: mv88e6xxx: Fix adding vlan 0").

*Control packets (currently hardcoded in sja1105 as link-local packets
for MAC DA ranges 01-80-c2-xx-xx-xx and 01-1b-19-xx-xx-xx) are received
based on packet traps and their precise source port is always known.

I have taken one patch from Colin because my work conflicts with his,
and integrating it all through the same series avoids that.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

This reverts commit cc1939e4.

Currently 2 classes of DSA drivers are able to send/receive packets
directly through the DSA master:
- drivers with DSA_TAG_PROTO_NONE
- sja1105

Now that sja1105 has gained the ability to perform traffic termination
even under the tricky case (VLAN-aware bridge), and that is much more
functional (we can perform VLAN-aware bridging with foreign interfaces),
there is no reason to keep this code in the receive path of the network
core. So delete it.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The main desire for having this feature in sja1105 is to support network
stack termination for traffic coming from a VLAN-aware bridge.

For sja1105, offloading the bridge data plane means sending packets
as-is, with the proper VLAN tag, to the chip. The chip will look up its
FDB and forward them to the correct destination port.

But we support bridge data plane offload even for VLAN-unaware bridges,
and the implementation there is different. In fact, VLAN-unaware
bridging is governed by tag_8021q, so it makes sense to have the
.bridge_fwd_offload_add() implementation fully within tag_8021q.
The key difference is that we only support 1 VLAN-aware bridge, but we
support multiple VLAN-unaware bridges. So we need to make sure that the
forwarding domain is not crossed by packets injected from the stack.

For this, we introduce the concept of a tag_8021q TX VLAN for bridge
forwarding offload. As opposed to the regular TX VLANs which contain
only 2 ports (the user port and the CPU port), a bridge data plane TX
VLAN is "multicast" (or "imprecise"): it contains all the ports that are
part of a certain bridge, and the hardware will select where the packet
goes within this "imprecise" forwarding domain.

Each VLAN-unaware bridge has its own "imprecise" TX VLAN, so we make use
of the unique "bridge_num" provided by DSA for the data plane offload.
We use the same 3 bits from the tag_8021q VLAN ID format to encode this
bridge number.

Note that these 3 bit positions have been used before for sub-VLANs in
best-effort VLAN filtering mode. The difference is that for best-effort,
the sub-VLANs were only valid on RX (and it was documented that the
sub-VLAN field needed to be transmitted as zero). Whereas for the bridge
data plane offload, these 3 bits are only valid on TX.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This is already common knowledge by now, but the sja1105 does not have
hardware support for DSA tagging for data plane packets, and tag_8021q
sets up a unique pvid per port, transmitted as VLAN-tagged towards the
CPU, for the source port to be decoded nonetheless.

When the port is part of a VLAN-aware bridge, the pvid committed to
hardware is taken from the bridge and not from tag_8021q, so we need to
work with that the best we can.

Configure the switches to send all packets to the CPU as VLAN-tagged
(even ones that were originally untagged on the wire) and make use of
dsa_untag_bridge_pvid() to get rid of it before we send those packets up
the network stack.

With the classified VLAN used by hardware known to the tagger, we first
peek at the VID in an attempt to figure out if the packet was received
from a VLAN-unaware port (standalone or under a VLAN-unaware bridge),
case in which we can continue to call dsa_8021q_rcv(). If that is not
the case, the packet probably came from a VLAN-aware bridge. So we call
the DSA helper that finds for us a "designated bridge port" - one that
is a member of the VLAN ID from the packet, and is in the proper STP
state - basically these are all checks performed by br_handle_frame() in
the software RX data path.

The bridge will accept the packet as valid even if the source port was
maybe wrong. So it will maybe learn the MAC SA of the packet on the
wrong port, and its software FDB will be out of sync with the hardware
FDB. So replies towards this same MAC DA will not work, because the
bridge will send towards a different netdev.

This is where the bridge data plane offload ("imprecise TX") added by
the next patch comes in handy. The software FDB is wrong, true, but the
hardware FDB isn't, and by offloading the bridge forwarding plane we
have a chance to right a wrong, and have the hardware look up the FDB
for us for the reply packet. So it all cancels out.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

With tag_sja1105.c's only ability being to perform an imprecise RX
procedure and identify whether a packet comes from a VLAN-aware bridge
or not, we have no way to determine whether a packet with VLAN ID 5
comes from, say, br0 or br1. Actually we could, but it would mean that
we need to restrict all VLANs from br0 to be different from all VLANs
from br1, and this includes the default_pvid, which makes a setup with 2
VLAN-aware bridges highly imprectical.

The fact of the matter is that this isn't even that big of a practical
limitation, since even with a single VLAN-aware bridge we can pretty
much enforce forwarding isolation based on the VLAN port membership.

So in the end, tell the user that they need to model their setup using a
single VLAN-aware bridge.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Now that best-effort VLAN filtering is gone and we are left with the
imprecise RX and imprecise TX based in VLAN-aware mode, where the tagger
just guesses the source port based on plausibility of the VLAN ID, 8021q
uppers installed on top of a standalone port, while other ports of that
switch are under a VLAN-aware bridge don't quite "just work".

In fact it could be possible to restrict the VLAN IDs used by the 8021q
uppers to not be shared with VLAN IDs used by that VLAN-aware bridge,
but then the tagger needs to be patched to search for 8021q uppers too,
not just for the "designated bridge port" which will be introduced in a
later patch.

I haven't given a possible implementation full thought, it seems maybe
possible but not worth the effort right now. The only certain thing is
that currently the tagger won't be able to figure out the source port
for these packets because they will come with the VLAN ID of the 8021q
upper and are no longer retagged to a tag_8021q sub-VLAN like the best
effort VLAN filtering code used to do. So just deny these for the
moment.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

With the best_effort_vlan_filtering mode now gone, the driver does not
have 3 operating modes anymore (VLAN-unaware, VLAN-aware and best effort),
but only 2.

The idea is that we will gain support for network stack I/O through a
VLAN-aware bridge, using the data plane offload framework (imprecise RX,
imprecise TX). So the VLAN-aware use case will be more functional.

But standalone ports that are part of the same switch when some other
ports are under a VLAN-aware bridge should work too. Termination on
those should work through the tag_8021q RX VLAN and TX VLAN.

This was not possible using the old logic, because:
- in VLAN-unaware mode, only the tag_8021q VLANs were committed to hw
- in VLAN-aware mode, only the bridge VLANs were committed to hw
- in best-effort VLAN mode, both the tag_8021q and bridge VLANs were
  committed to hw

The strategy for the new VLAN-aware mode is to allow the bridge and the
tag_8021q VLANs to coexist in the VLAN table at the same time.

[ yes, we need to make sure that the bridge cannot install a tag_8021q
  VLAN, but ]

This means that the save/restore logic introduced by commit ec5ae610
("net: dsa: sja1105: save/restore VLANs using a delta commit method")
does not serve a purpose any longer. We can delete it and restore the
old code that simply adds a VLAN to the VLAN table and calls it a day.

Note that we keep the sja1105_commit_pvid() function from those days,
but adapt it slightly. Ports that are under a VLAN-aware bridge use the
bridge's pvid, ports that are standalone or under a VLAN-unaware bridge
use the tag_8021q pvid, for local termination or VLAN-unaware forwarding.

Now, when the vlan_filtering property is toggled for the bridge, the
pvid of the ports beneath it is the only thing that's changing, we no
longer delete some VLANs and restore others.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The pointer table is being re-assigned with a value that is never
read. The assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Introduce a brother of br_vlan_get_info() which is protected by the RCU
mechanism, as opposed to br_vlan_get_info() which relies on taking the
write-side rtnl_mutex.

This is needed for drivers which need to find out whether a bridge port
has a VLAN configured or not. For example, certain DSA switches might
not offer complete source port identification to the CPU on RX, just the
VLAN in which the packet was received. Based on this VLAN, we cannot set
an accurate skb->dev ingress port, but at least we can configure one
that behaves the same as the correct one would (this is possible because
DSA sets skb->offload_fwd_mark = 1).

When we look at the bridge RX handler (br_handle_frame), we see that
what matters regarding skb->dev is the VLAN ID and the port STP state.
So we need to select an skb->dev that has the same bridge VLAN as the
packet we're receiving, and is in the LEARNING or FORWARDING STP state.
The latter is easy, but for the former, we should somehow keep a shadow
list of the bridge VLANs on each port, and a lookup table between VLAN
ID and the 'designated port for imprecise RX'. That is rather
complicated to keep in sync properly (the designated port per VLAN needs
to be updated on the addition and removal of a VLAN, as well as on the
join/leave events of the bridge on that port).

So, to avoid all that complexity, let's just iterate through our finite
number of ports and ask the bridge, for each packet: "do you have this
VLAN configured on this port?".

Cc: Roopa Prabhu <roopa@nvidia.com>
Cc: Nikolay Aleksandrov <nikolay@nvidia.com>
Cc: Ido Schimmel <idosch@nvidia.com>
Cc: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING is notified by the bridge from
two places:
- nbp_vlan_init(), during bridge port creation
- br_vlan_filter_toggle(), during a netlink/sysfs/ioctl change requested
  by user space

If a switchdev driver uses br_vlan_enabled(br_dev) inside its handler
for the SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING attribute notifier,
different things will be seen depending on whether the bridge calls from
the first path or the second:
- in nbp_vlan_init(), br_vlan_enabled() reflects the current state of
  the bridge
- in br_vlan_filter_toggle(), br_vlan_enabled() reflects the past state
  of the bridge

This can lead in some cases to complications in driver implementation,
which can be avoided if these could reliably use br_vlan_enabled().

Nothing seems to depend on this behavior, and it seems overall more
straightforward for br_vlan_enabled() to return the proper value even
during the SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING notifier, so
temporarily enable the bridge option, then revert it if the switchdev
notifier failed.

Cc: Roopa Prabhu <roopa@nvidia.com>
Cc: Nikolay Aleksandrov <nikolay@nvidia.com>
Cc: Ido Schimmel <idosch@nvidia.com>
Cc: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

mlx5-updates-2021-07-24

This series aims to reduce coupling in mlx5e, particularly between RX
resources (TIRs, RQTs) and numerous code units that use them.

This refactoring is required for upcoming features, ADQ and TX lag
hashing.

The issue with the current code is that TIRs and RQTs are unmanaged,
different places all over the driver create, destroy, track and
configure them, often in an uncoordinated way. The responsibilities of
different units become vague, leading to a lot of hidden dependencies
between numerous units and tight coupling between them, which is prone
to bugs and hard to maintain.

The result of this refactoring is:

1. Creating a manager for RX resources, that controls their lifecycle
and provides a clear API, which restricts the set of actions that other
units can do.

2. Using object-oriented approach for TIRs, RQTs and RX resource
manager (struct mlx5e_rx_res).

3. Fixing a few bugs and misbehaviors found during the refactoring.

4. Reducing the amount of dependencies, removing hidden dependencies,
making them one-directional and organizing the code in clear abstraction
layers.

5. Explicitly exposing the remaining weird dependencies.

6. Simplifying and organizing code that creates and modifies TIRs and
RQTs.

Saeed Mahameed says:

====================
mlx5 updates 2021-07-24

This series provides some refactoring to mlx5e RX resource management,
it is required for upcoming ADQ and TX lag hashing features.

The first two patches in this series :
  net/mlx5e: Prohibit inner indir TIRs in IPoIB
  net/mlx5e: Block LRO if firmware asks for tunneled LRO
Were supposed to go to net, but due to dependency and timing they were
included here.
I would appreciate it if you'd apply them to net and mark for -stable.

For more information please see tag log below.

Please pull and let me know if there is any problem.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'linux-can-next-for-5.15-20210725' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

linux-can-next-for-5.15-20210725

Marc Kleine-Budde says:

====================
pull-request: can-next 2021-07-25

this is a pull request of 46 patches for net-next/master.

The first 6 patches target the CAN J1939 protocol. One is from
gushengxian, fixing a grammatical error, 5 are by me fixing a checkpatch
warning, make use of the fallthrough pseudo-keyword, and use
consistent variable naming.

The next 3 patches target the rx-offload helper, are by me and improve
the performance and fix the local softirq work pending error, when
napi_schedule() is called from threaded IRQ context.

The next 3 patches are by Vincent Mailhol and me update the CAN
bittiming and transmitter delay compensation, the documentation for
the struct can_tdc is fixed, clear data_bittiming if FD mode is turned
off and a redundant check is removed.

Followed by 4 patches targeting the m_can driver. Faiz Abbas's patches
add support for CAN PHY via the generic phy subsystem. Yang Yingliang
converts the driver to use devm_platform_ioremap_resource_byname().
And a patch by me which removes the unused support for custom bit
timing.

Andy Shevchenko contributes 2 patches for the mcp251xfd driver to
prepare the driver for ACPI support. A patch by me adds support for
shared IRQ handlers.

Zhen Lei contributes 3 patches to convert the esd_usb2, janz-ican3 and
the at91_can driver to make use of the DEVICE_ATTR_RO/RW() macros.

The next 8 patches are by Peng Li and provide general cleanups for the
at91_can driver.

The next 7 patches target the peak driver. Frist 2 cleanup patches by
me for the peak_pci driver, followed by Stephane Grosjean' patch to
print the name and firmware version of the detected hardware. The
peak_usb driver gets a cleanup patch, loopback and one-shot mode and
an upgrading of the bus state change handling in Stephane Grosjean's
patches.

Vincent Mailhol provides 6 cleanup patches for the etas_es58x driver.

In the last 3 patches Angelo Dureghello add support for the mcf5441x
SoC to the flexcan driver.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

One of the previous commits introduced a dedicated object for a TIR.
kTLS code creates a TIR per connection using the low-level mlx5_core
API. This commit converts it to the new mlx5e_tir API.
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

This commit moves the responsibility of keeping the RSS configuration
for different traffic types to en/rx_res.{c,h}, hiding the
implementation details behind the new getters, and abandons all usage of
struct mlx5e_tirc_config, which is no longer useful and superseded by
struct mlx5e_rss_params_traffic_type.
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Code related to TIR is now encapsulated into a dedicated object and put
into new files en/tir.{c,h}. All usages are converted.

The Builder pattern is used to initialize a TIR. It allows to create a
multitude of different configurations, turning on and off some specific
features in different combinations, without having long parameter lists,
initializers per usage and repeating code in initializers.
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

This commit introduces a new struct to store RSS hash parameters: hash
function and hash key. The existing usages are changed to use the new
struct.
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

In order to drop a dependency to mdev and make the function more
universal, stop passing mdev to mlx5e_build_indir_tir_ctx_common() and
pass transport domain directly instead. It also prepares this function
to be used in other contexts that need a custom transport domain, such
as hairpin.
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>