Mina Almasry says:

====================
Abstract page from net stack

This series is a prerequisite to the devmem TCP series. For a full
snapshot of the code which includes these changes, feel free to check:

https://github.com/mina/linux/commits/tcpdevmem-rfcv5/

Currently these components in the net stack use the struct page
directly:

1. Drivers.
2. Page pool.
3. skb_frag_t.

To add support for new (non struct page) memory types to the net stack, we
must first abstract the current memory type.

Originally the plan was to reuse struct page* for the new memory types,
and to set the LSB on the page* to indicate it's not really a page.
However, for safe compiler type checking we need to introduce a new type.

struct netmem is introduced to abstract the underlying memory type.
Currently it's a no-op abstraction that is always a struct page underneath.
In parallel there is an undergoing effort to add support for devmem to the
net stack:

https://lore.kernel.org/netdev/20231208005250.2910004-1-almasrymina@google.com/

Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Yunsheng Lin <linyunsheng@huawei.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
====================

Link: https://lore.kernel.org/r/20240214223405.1972973-1-almasrymina@google.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Use struct netmem* instead of page in skb_frag_t. Currently struct
netmem* is always a struct page underneath, but the abstraction
allows efforts to add support for skb frags not backed by pages.

There is unfortunately 1 instance where the skb_frag_t is assumed to be
a exactly a bio_vec in kcm. For this case, WARN_ON_ONCE and return error
before doing a cast.

Add skb[_frag]_fill_netmem_*() and skb_add_rx_frag_netmem() helpers so
that the API can be used to create netmem skbs.
Signed-off-by: Mina Almasry <almasrymina@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Add the netmem_ref type, an abstraction for network memory.

To add support for new memory types to the net stack, we must first
abstract the current memory type. Currently parts of the net stack
use struct page directly:

- page_pool
- drivers
- skb_frag_t

Originally the plan was to reuse struct page* for the new memory types,
and to set the LSB on the page* to indicate it's not really a page.
However, for compiler type checking we need to introduce a new type.

netmem_ref is introduced to abstract the underlying memory type.
Currently it's a no-op abstraction that is always a struct page
underneath. In parallel there is an undergoing effort to add support
for devmem to the net stack:

https://lore.kernel.org/netdev/20231208005250.2910004-1-almasrymina@google.com/

netmem_ref can be pointers to different underlying memory types, and the
low bits are set to indicate the memory type. Helpers are provided
to convert netmem pointers to the underlying memory type (currently only
struct page). In the devmem series helpers are provided so that calling
code can use netmem without worrying about the underlying memory type
unless absolutely necessary.
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Creation of sysfs entries is expensive, mainly for workloads that
constantly creates netdev and netns often.

Do not create BQL sysfs entries for devices that don't need,
basically those that do not have a real queue, i.e, devices that has
NETIF_F_LLTX and IFF_NO_QUEUE, such as `lo` interface.

This will remove the /sys/class/net/eth0/queues/tx-X/byte_queue_limits/
directory for these devices.

In the example below, eth0 has the `byte_queue_limits` directory but not
`lo`.

	# ls /sys/class/net/lo/queues/tx-0/
	traffic_class  tx_maxrate  tx_timeout  xps_cpus  xps_rxqs

	# ls /sys/class/net/eth0/queues/tx-0/byte_queue_limits/
	hold_time  inflight  limit  limit_max  limit_min

This also removes the #ifdefs, since we can also use netdev_uses_bql() to
check if the config is enabled. (as suggested by Jakub).
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20240216094154.3263843-1-leitao@debian.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Use global percpu page_pool_recycle_stats counter for system page_pool
allocator instead of allocating a separate percpu variable for each
(also percpu) page pool instance.
Reviewed-by: Toke Hoiland-Jorgensen <toke@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://lore.kernel.org/r/87f572425e98faea3da45f76c3c68815c01a20ee.1708075412.git.lorenzo@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Now that direct recycling is performed basing on pool->cpuid when set,
memory leaks are possible:

1. A pool is destroyed.
2. Alloc cache is emptied (it's done only once).
3. pool->cpuid is still set.
4. napi_pp_put_page() does direct recycling basing on pool->cpuid.
5. Now alloc cache is not empty, but it won't ever be freed.

In order to avoid that, rewrite pool->cpuid to -1 when unlinking NAPI to
make sure no direct recycling will be possible after emptying the cache.
This involves a bit of overhead as pool->cpuid now must be accessed
via READ_ONCE() to avoid partial reads.
Rename page_pool_unlink_napi() -> page_pool_disable_direct_recycling()
to reflect what it actually does and unexport it.
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20240215113905.96817-1-aleksander.lobakin@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

iMX8QM have iommu. Add proerty 'iommus'.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240201-8qm_smmu-v2-2-3d12a80201a3@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct tc_pedit.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Shannon Nelson says:

====================
pds_core: AER handling

Add simple handlers for the PCI AER callbacks, and improve
the reset handling.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

We get the benefit of all the PCI reset locking and recovery if
we use the existing pci_reset_function() that will call our
local reset handlers.
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When the VF is hit with a reset, remove the aux device in
the prepare for reset and try to restore it after the reset.
The userland mechanics will need to recover and rebuild whatever
uses the device afterwards.
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set up the pci_error_handlers error_detected and resume to be
useful in handling AER events.
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

-queue

Tony Nguyen says:

====================
i40e: Simplify VSI and VEB handling

Ivan Vecera says:

The series simplifies handling of VSIs and VEBs by introducing for-each
iterating macros, 'find' helper functions. Also removes the VEB
recursion because the VEBs cannot have sub-VEBs according datasheet and
fixes the support for floating VEBs.

The series content:
Patch 1 - Uses existing helper function for find FDIR VSI instead of loop
Patch 2 - Adds and uses macros to iterate VSI and VEB arrays
Patch 3 - Adds 2 helper functions to find VSIs and VEBs by their SEID
Patch 4 - Fixes broken support for floating VEBs
Patch 5 - Removes VEB recursion and simplifies VEB handling
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

If message contains unknown attribute and user passes
"--process-unknown" command line option, _decode() gets called with space
arg set to None. In that case, attr_space variable is not initialized
used which leads to following trace:

Traceback (most recent call last):
  File "./tools/net/ynl/cli.py", line 77, in <module>
    main()
  File "./tools/net/ynl/cli.py", line 68, in main
    reply = ynl.dump(args.dump, attrs)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "tools/net/ynl/lib/ynl.py", line 909, in dump
    return self._op(method, vals, [], dump=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "tools/net/ynl/lib/ynl.py", line 894, in _op
    rsp_msg = self._decode(decoded.raw_attrs, op.attr_set.name)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "tools/net/ynl/lib/ynl.py", line 639, in _decode
    self._rsp_add(rsp, attr_name, None, self._decode_unknown(attr))
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "tools/net/ynl/lib/ynl.py", line 569, in _decode_unknown
    return self._decode(NlAttrs(attr.raw), None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "tools/net/ynl/lib/ynl.py", line 630, in _decode
    search_attrs = SpaceAttrs(attr_space, rsp, outer_attrs)
                              ^^^^^^^^^^
UnboundLocalError: cannot access local variable 'attr_space' where it is not associated with a value

Fix this by moving search_attrs assignment under the if statement
above it to make sure attr_space is initialized.

Fixes: bf8b8323 ("tools/net/ynl: Support sub-messages in nested attribute spaces")
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Avoid the following warnings by removing the ena_select_queue() function
and rely on the net core to do the queue selection, The issue happen
when an skb received from an interface with more queues than ena is
forwarded to the ena interface.

[ 1176.159959] eth0 selects TX queue 11, but real number of TX queues is 8
[ 1176.863976] eth0 selects TX queue 14, but real number of TX queues is 8
[ 1180.767877] eth0 selects TX queue 14, but real number of TX queues is 8
[ 1188.703742] eth0 selects TX queue 14, but real number of TX queues is 8

Fixes: 1738cd3e ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Kamal Heib <kheib@redhat.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Aquantia AQR813 is the Octal Port variant of the AQR113. Add PHY ID for
it to provide support for it.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

It is impossible to disable BQL individually today, since there is no
prompt for the Kconfig entry, so, the BQL is always enabled if SYSFS is
enabled.

Create a prompt entry for BQL, so, it could be enabled or disabled at
build time independently of SYSFS.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Heiner Kallweit says:

====================
net: phy: add support for the EEE 2 registers

This series adds support for the EEE 2 registers. Most relevant and
for now the only supported modes are 2500baseT and 5000baseT.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for handling the EEE advertisement 2 register.
For now only 2500baseT and 5000baseT modes are supported.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for reading EEE link partner ability 2 register.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add and use genphy_c45_read_eee_cap2(), complementing
genphy_c45_read_eee_cap1().
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

As a prerequisite for adding EEE CAP2 register support, complement
PHY_EEE_CAP1_FEATURES with PHY_EEE_CAP2_FEATURES.
For now only 2500baseT and 5000baseT modes are supported.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This adds helpers for accessing the EEE CAP2 registers.
For now only 2500baseT and 5000baseT modes are supported.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The VEB (virtual embedded switch) as a switch element can be
connected according datasheet though its uplink to:
- Physical port
- Port Virtualizer (not used directly by i40e driver but can
  be present in MFP mode where the physical port is shared
  between PFs)
- No uplink (aka floating VEB)

But VEB uplink cannot be connected to another VEB and any attempt
to do so results in:

"i40e 0000:02:00.0: couldn't add VEB, err -EIO aq_err I40E_AQ_RC_ENOENT"

that indicates "the uplink SEID does not point to valid element".

Remove this logic from the driver code this way:

1) For debugfs only allow to build floating VEB (uplink_seid == 0)
   or main VEB (uplink_seid == mac_seid)
2) Do not recurse in i40e_veb_link_event() as no VEB cannot have
   sub-VEBs
3) Ditto for i40e_veb_rebuild() + simplify the function as we know
   that the VEB for rebuild can be only the main LAN VEB or some
   of the floating VEBs
4) In i40e_rebuild() there is no need to check veb->uplink_seid
   as the possible ones are 0 and MAC SEID
5) In i40e_vsi_release() do not take into account VEBs whose
   uplink is another VEB as this is not possible
6) Remove veb_idx field from i40e_veb as a VEB cannot have
   sub-VEBs

Tested using i40e debugfs interface:
1) Initial state
[root@cnb-03 net-next]# CMD="/sys/kernel/debug/i40e/0000:02:00.0/command"
[root@cnb-03 net-next]# echo dump switch > $CMD
[root@cnb-03 net-next]# dmesg -c
[   98.440641] i40e 0000:02:00.0: header: 3 reported 3 total
[   98.446053] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[   98.452593] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[   98.458856] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16

2) Add floating VEB
[root@cnb-03 net-next]# echo add relay > $CMD
[root@cnb-03 net-next]# dmesg -c
[  122.745630] i40e 0000:02:00.0: added relay 162
[root@cnb-03 net-next]# echo dump switch > $CMD
[root@cnb-03 net-next]# dmesg -c
[  136.650049] i40e 0000:02:00.0: header: 4 reported 4 total
[  136.655466] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  136.661994] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  136.668264] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16
[  136.674787] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0

3) Add VMDQ2 VSI to this new VEB
[root@cnb-03 net-next]# dmesg -c
[  168.351763] i40e 0000:02:00.0: added VSI 394 to relay 162
[  168.374652] enp2s0f0np0v0: NIC Link is Up, 40 Gbps Full Duplex, Flow Control: None
[root@cnb-03 net-next]# echo dump switch > $CMD
[root@cnb-03 net-next]# dmesg -c
[  195.683204] i40e 0000:02:00.0: header: 5 reported 5 total
[  195.688611] i40e 0000:02:00.0: type=19 seid=394 uplink=162 downlink=16
[  195.695143] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0
[  195.701410] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  195.707935] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  195.714201] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16

4) Try to delete the VEB
[root@cnb-03 net-next]# echo del relay 162 > $CMD
[root@cnb-03 net-next]# dmesg -c
[  239.260901] i40e 0000:02:00.0: deleting relay 162
[  239.265621] i40e 0000:02:00.0: can't remove VEB 162 with 1 VSIs left

5) Do PF reset and check switch status after rebuild
[root@cnb-03 net-next]# echo pfr > $CMD
[root@cnb-03 net-next]# echo dump switch > $CMD
[root@cnb-03 net-next]# dmesg -c
...
[  272.333655] i40e 0000:02:00.0: header: 5 reported 5 total
[  272.339066] i40e 0000:02:00.0: type=19 seid=394 uplink=162 downlink=16
[  272.345599] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0
[  272.351862] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  272.358387] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  272.364654] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16

6) Delete VSI and delete VEB
[  297.199116] i40e 0000:02:00.0: deleting VSI 394
[  299.807580] i40e 0000:02:00.0: deleting relay 162
[  309.767905] i40e 0000:02:00.0: header: 3 reported 3 total
[  309.773318] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  309.779845] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  309.786111] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Although the i40e supports so-called floating VEB (VEB without
an uplink connection to external network), this support is
broken. This functionality is currently unused (except debugfs)
but it will be used by subsequent series for switchdev mode
slow-path. Fix this by following:

1) Handle correctly floating VEB (VEB with uplink_seid == 0)
   in i40e_reconstitute_veb() and look for owner VSI and
   create it only for non-floating VEBs and also set bridge
   mode only for such VEBs as the floating ones are using
   always VEB mode.
2) Handle correctly floating VEB in i40e_veb_release() and
   disallow its release when there are some VSIs. This is
   different from regular VEB that have owner VSI that is
   connected to VEB's uplink after VEB deletion by FW.
3) Fix i40e_add_veb() to handle 'vsi' that is NULL for floating
   VEBs. For floating VEB use 0 for downlink SEID and 'true'
   for 'default_port' parameters as per datasheet.
4) Fix 'add relay' command in i40e_dbg_command_write() to allow
   to create floating VEB by 'add relay 0 0' or 'add relay'

Tested using debugfs:
1) Initial state
[root@host net-next]# echo dump switch > $CMD
[root@host net-next]# dmesg -c
[  173.701286] i40e 0000:02:00.0: header: 3 reported 3 total
[  173.706701] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  173.713241] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  173.719507] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16

2) Add floating VEB
[root@host net-next]# CMD="/sys/kernel/debug/i40e/0000:02:00.0/command"
[root@host net-next]# echo add relay > $CMD
[root@host net-next]# dmesg -c
[  245.551720] i40e 0000:02:00.0: added relay 162
[root@host net-next]# echo dump switch > $CMD
[root@host net-next]# dmesg -c
[  276.984371] i40e 0000:02:00.0: header: 4 reported 4 total
[  276.989779] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  276.996302] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  277.002569] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16
[  277.009091] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0

3) Add VMDQ2 VSI to this new VEB
[root@host net-next]# echo add vsi 162 > $CMD
[root@host net-next]# dmesg -c
[  332.314030] i40e 0000:02:00.0: added VSI 394 to relay 162
[  332.337486] enp2s0f0np0v0: NIC Link is Up, 40 Gbps Full Duplex, Flow Control: None
[root@host net-next]# echo dump switch > $CMD
[root@host net-next]# dmesg -c
[  387.284490] i40e 0000:02:00.0: header: 5 reported 5 total
[  387.289904] i40e 0000:02:00.0: type=19 seid=394 uplink=162 downlink=16
[  387.296446] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0
[  387.302708] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  387.309234] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  387.315500] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16

4) Try to delete the VEB
[root@host net-next]# echo del relay 162 > $CMD
[root@host net-next]# dmesg -c
[  428.749297] i40e 0000:02:00.0: deleting relay 162
[  428.754011] i40e 0000:02:00.0: can't remove VEB 162 with 1 VSIs left

5) Do PF reset and check switch status after rebuild
[root@host net-next]# echo pfr > $CMD
[root@host net-next]# echo dump switch > $CMD
[root@host net-next]# dmesg -c
[  738.056172] i40e 0000:02:00.0: header: 5 reported 5 total
[  738.061577] i40e 0000:02:00.0: type=19 seid=394 uplink=162 downlink=16
[  738.068104] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0
[  738.074367] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[  738.080892] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[  738.087160] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16

6) Delete VSI and delete VEB
[root@host net-next]# echo del vsi 394 > $CMD
[root@host net-next]# echo del relay 162 > $CMD
[root@host net-next]# echo dump switch > $CMD
[root@host net-next]# dmesg -c
[ 1233.081126] i40e 0000:02:00.0: deleting VSI 394
[ 1239.345139] i40e 0000:02:00.0: deleting relay 162
[ 1244.886920] i40e 0000:02:00.0: header: 3 reported 3 total
[ 1244.892328] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16
[ 1244.898853] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0
[ 1244.905119] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Add two helpers i40e_(veb|vsi)_get_by_seid() to find corresponding
VEB or VSI by their SEID value and use these helpers to replace
existing open-coded loops.
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Introduce i40e_for_each_vsi() and i40e_for_each_veb() helper
macros and use them to iterate relevant arrays.

Replace pattern:
for (i = 0; i < pf->num_alloc_vsi; i++)
by:
i40e_for_each_vsi(pf, i, vsi)

and pattern:
for (i = 0; i < I40E_MAX_VEB; i++)
by
i40e_for_each_veb(pf, i, veb)

These macros also check if array item pf->vsi[i] or pf->veb[i]
are not NULL and skip such items so we can remove redundant
checks from loop bodies.
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Use existing i40e_find_vsi_by_type() to find a VSI
associated with flow director.
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Add Aquantia AQR113 PHY ID. Aquantia AQR113 is just a chip size variant of
the already supported AQR133C where the only difference is the PHY ID
and the hw chip size.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove the duplicate calls to prueth_emac_stop() and
prueth_cleanup_tx_chns() in emac_ndo_stop().
Signed-off-by: Diogo Ivo <diogo.ivo@siemens.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Reviewed-by: MD Danish Anwar <danishanwar@ti.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix a misspelling of "circuit".
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

Shannon Nelson says:

====================
ionic: add XDP support

This patchset is new support in ionic for XDP processing,
including basic XDP on Rx packets, TX and REDIRECT, and frags
for jumbo frames.

Since ionic has not yet been converted to use the page_pool APIs,
this uses the simple MEM_TYPE_PAGE_ORDER0 buffering.  There are plans
to convert the driver in the near future.

v4:
 - removed "inline" from short utility functions
 - changed to use "goto err_out" in ionic_xdp_register_rxq_info()
 - added "continue" to reduce nesting in ionic_xdp_queues_config()
 - used xdp_prog in ionic_rx_clean() to flag whether or not to sync
   the rx buffer after calling ionix_xdp_run()
 - swapped order of XDP_TX and XDP_REDIRECT cases in ionic_xdp_run()
   to make patch 6 a little cleaner

v3:
https://lore.kernel.org/netdev/20240210004827.53814-1-shannon.nelson@amd.com/
 - removed budget==0 patch, sent it separately to net

v2:
https://lore.kernel.org/netdev/20240208005725.65134-1-shannon.nelson@amd.com/
 - added calls to txq_trans_cond_update()
 - added a new patch to catch NAPI budget==0

v1:
https://lore.kernel.org/netdev/20240130013042.11586-1-shannon.nelson@amd.com/

RFC:
https://lore.kernel.org/netdev/20240118192500.58665-1-shannon.nelson@amd.com/
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for using scatter-gather / frags in XDP in both
Rx and Tx paths.
Co-developed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When our ndo_xdp_xmit is called we mark the buffer with
XDP_REDIRECT so we know to return it to the XDP stack for
cleaning.
Co-developed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The XDP_REDIRECT packets are given to the XDP stack and
we drop the use of the related page: it will get freed
by the driver that ends up doing the Tx.  Because we have
some hardware configurations with limited queue resources,
we use the existing datapath Tx queues rather than creating
and managing a separate set of xdp_tx queues.
Co-developed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The XDP_TX packets get fed back into the Rx queue's partnered
Tx queue as an xdp_frame.
Co-developed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If an xdp program is loaded, add headroom at the beginning
of the frame to allow for editing and insertions that an XDP
program might need room for, and tailroom used later for XDP
frame tracking.  These are only needed in the first Rx buffer
in a packet, not for any trailing frags.
Co-developed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Set up the basics for running Rx packets through XDP programs.
Add new queue setup and teardown steps for adding/removing an
XDP program, and add the call to run the XDP on a packet.

The XDP frame size needs to be the MTU plus standard ethernet
header, plus head room for XDP scribblings and tail room for a
struct skb_shared_info.  Also, at this point, we don't support
XDP frags, only a single contiguous Rx buffer.  This means
that our page splitting is not very useful, so when XDP is in
use we need to use the full Rx buffer size and not do sharing.
Co-developed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Convert Rx datapath handling to use the DMA range APIs
in preparation for adding XDP handling.
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

These helpers clean up some of the code around DMA mapping
and other buffer references, and will be used in the next
few patches for the XDP support.
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>