strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

ethtool_sprintf() is designed specifically for get_strings() usage.
Let's replace strncpy in favor of this dedicated helper function.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231012-strncpy-drivers-net-phy-smsc-c-v1-1-00528f7524b3@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

Considering the above, a suitable replacement is `strscpy` [2] due to
the fact that it guarantees NUL-termination on the destination buffer
without unnecessarily NUL-padding.

Other implementations of .*get_drvinfo also use strscpy so this patch
brings keystone_get_drvinfo() in line as well:

igb/igb_ethtool.c +851
static void igb_get_drvinfo(struct net_device *netdev,

igbvf/ethtool.c
167:static void igbvf_get_drvinfo(struct net_device *netdev,

i40e/i40e_ethtool.c
1999:static void i40e_get_drvinfo(struct net_device *netdev,

e1000/e1000_ethtool.c
529:static void e1000_get_drvinfo(struct net_device *netdev,

ixgbevf/ethtool.c
211:static void ixgbevf_get_drvinfo(struct net_device *netdev,

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20231012-strncpy-drivers-net-ethernet-ti-netcp_ethss-c-v1-1-93142e620864@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

TCP pingpong threshold is 1 by default. But some applications, like SQL DB
may prefer a higher pingpong threshold to activate delayed acks in quick
ack mode for better performance.

The pingpong threshold and related code were changed to 3 in the year
2019 in:
  commit 4a41f453 ("tcp: change pingpong threshold to 3")
And reverted to 1 in the year 2022 in:
  commit 4d8f24ee ("Revert "tcp: change pingpong threshold to 3"")

There is no single value that fits all applications.
Add net.ipv4.tcp_pingpong_thresh sysctl tunable, so it can be tuned for
optimal performance based on the application needs.
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/1697056244-21888-1-git-send-email-haiyangz@microsoft.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Add an initial user for the newly added tcf_set_drop_reason() helper to set the
drop reason for internal errors leading to TC_ACT_SHOT inside {__,}tcf_classify().

Right now this only adds a very basic SKB_DROP_REASON_TC_ERROR as a generic
fallback indicator to mark drop locations. Where needed, such locations can be
converted to more specific codes, for example, when hitting the reclassification
limit, etc.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Victor Nogueira <victor@mojatatu.com>
Link: https://lore.kernel.org/r/20231009092655.22025-2-daniel@iogearbox.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Currently, the kfree_skb_reason() in sch_handle_{ingress,egress}() can only
express a basic SKB_DROP_REASON_TC_INGRESS or SKB_DROP_REASON_TC_EGRESS reason.

Victor kicked-off an initial proposal to make this more flexible by disambiguating
verdict from return code by moving the verdict into struct tcf_result and
letting tcf_classify() return a negative error. If hit, then two new drop
reasons were added in the proposal, that is SKB_DROP_REASON_TC_INGRESS_ERROR
as well as SKB_DROP_REASON_TC_EGRESS_ERROR. Further analysis of the actual
error codes would have required to attach to tcf_classify via kprobe/kretprobe
to more deeply debug skb and the returned error.

In order to make the kfree_skb_reason() in sch_handle_{ingress,egress}() more
extensible, it can be addressed in a more straight forward way, that is: Instead
of placing the verdict into struct tcf_result, we can just put the drop reason
in there, which does not require changes throughout various classful schedulers
given the existing verdict logic can stay as is.

Then, SKB_DROP_REASON_TC_ERROR{,_*} can be added to the enum skb_drop_reason
to disambiguate between an error or an intentional drop. New drop reason error
codes can be added successively to the tc code base.

For internal error locations which have not yet been annotated with a
SKB_DROP_REASON_TC_ERROR{,_*}, the fallback is SKB_DROP_REASON_TC_INGRESS and
SKB_DROP_REASON_TC_EGRESS, respectively. Generic errors could be marked with a
SKB_DROP_REASON_TC_ERROR code until they are converted to more specific ones
if it is found that they would be useful for troubleshooting.

While drop reasons have infrastructure for subsystem specific error codes which
are currently used by mac80211 and ovs, Jakub mentioned that it is preferred
for tc to use the enum skb_drop_reason core codes given it is a better fit and
currently the tooling support is better, too.

With regards to the latter:

  [...] I think Alastair (bpftrace) is working on auto-prettifying enums when
  bpftrace outputs maps. So we can do something like:

  $ bpftrace -e 'tracepoint:skb:kfree_skb { @[args->reason] = count(); }'
  Attaching 1 probe...
  ^C

  @[SKB_DROP_REASON_TC_INGRESS]: 2
  @[SKB_CONSUMED]: 34

  ^^^^^^^^^^^^ names!!

  Auto-magically. [...]

Add a small helper tcf_set_drop_reason() which can be used to set the drop reason
into the tcf_result.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Victor Nogueira <victor@mojatatu.com>
Link: https://lore.kernel.org/netdev/20231006063233.74345d36@kernel.orgReviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20231009092655.22025-1-daniel@iogearbox.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The tsnep network controller is able to extend the descriptor directly
with data to be transmitted. In this case no TX data DMA address is
necessary. Instead of the TX data DMA address the TX data buffer is
placed at the end of the descriptor.

The descriptor is read with a 64 bytes DMA read by the tsnep network
controller. If the sum of descriptor data and TX data is less than or
equal to 64 bytes, then no additional DMA read is necessary to read the
TX data. Therefore, it makes sense to inline small fragments up to this
limit within the descriptor ring.

Inlined fragments need to be copied to the descriptor ring. On the other
hand DMA mapping is not necessary. At most 40 bytes are copied, so
copying should be faster than DMA mapping.

For A53 1.2 GHz copying takes <100ns and DMA mapping takes >200ns. So
inlining small fragments should result in lower CPU load. Performance
improvement is small. Thus, comparision of CPU load with and without
inlining of small fragments did not show any significant difference.
With this optimization less DMA reads will be done, which decreases the
load of the interconnect.
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Beniamino Galvani says:

====================
net: consolidate IPv4 route lookup for UDP tunnels

At the moment different UDP tunnels rely on different functions for
IPv4 route lookup, and those functions all implement the same
logic. Only bareudp uses the generic ip_route_output_tunnel(), while
geneve and vxlan basically duplicate it slightly differently.

This series first extends the generic lookup function so that it is
suitable for all UDP tunnel implementations. Then, bareudp, geneve and
vxlan are adapted to use them.

This results in code with less duplication and hopefully better
maintainability.

After this series is merged, IPv6 will be converted in a similar way.

Changelog:
v2
 - fix compilation with IPv6 disabled
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

The route lookup can be done now via generic function
udp_tunnel_dst_lookup() to replace the custom implementations in
vxlan_get_route().

Note that this patch only touches IPv4, while IPv6 still uses
vxlan6_get_route(). After IPv6 route lookup gets converted as well,
vxlan_xmit_one() can be simplified by removing local variables that
will be passed via "struct ip_tunnel_key", such as remote_ip,
local_ip, flow_flags, label.
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The route lookup can be done now via generic function
udp_tunnel_dst_lookup() to replace the custom implementation in
geneve_get_v4_rt().
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a helper function to compute the tos/dsfield. In this way, we can
factor out some duplicate code. Also, the helper will be called from
more places in the next commit.
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Commit 451ef36b ("ip_tunnels: Add new flow flags field to
ip_tunnel_key") added a new field to struct ip_tunnel_key to control
route lookups. Currently the flag is used by vxlan and geneve tunnels;
use it also in udp_tunnel_dst_lookup() so that it affects all tunnel
types relying on this function.
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

We want to make the function more generic so that it can be used by
other UDP tunnel implementations such as geneve and vxlan. To do that,
add the following arguments:

 - source and destination UDP port;
 - ifindex of the output interface, needed by vxlan;
 - the tos, because in some cases it is not taken from struct
   ip_tunnel_info (for example, when it's inherited from the inner
   packet);
 - the dst cache, because not all tunnel types (e.g. vxlan) want to
   use the one from struct ip_tunnel_info.

With these parameters, the function no longer needs the full struct
ip_tunnel_info as argument and we can pass only the relevant part of
it (struct ip_tunnel_key).
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The function is now UDP-specific, the protocol is always IPPROTO_UDP.
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

At the moment ip_route_output_tunnel() is used only by bareudp.
Ideally, other UDP tunnel implementations should use it, but to do so
the function needs to accept new parameters that are specific for UDP
tunnels, such as the ports.

Prepare for these changes by renaming the function to
udp_tunnel_dst_lookup() and move it to file
net/ipv4/udp_tunnel_core.c.
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

These variables are never referenced in the code, just remove them
Signed-off-by: zhujun2 <zhujun2@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Simplify logic for rspq_check_napi.
Drop redundant and wrong napi_is_scheduled call as it's not race free
and directly use the output of napi_schedule to understand if a napi is
pending or not.

rspq_check_napi main logic is to check if is_new_response is true and
check if a napi is not scheduled. The result of this function is then
used to detect if we are missing some interrupt and act on top of
this... With this knowing, we can rework and simplify the logic and make
it less problematic with testing an internal bit for napi.
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Xabier Marquiegui says:

====================
ptp: Support for multiple filtered timestamp event queue readers

On systems with multiple timestamp event channels, there can be scenarios
where multiple userspace readers want to access the timestamping data for
various purposes.

One such example is wanting to use a pps out for time synchronization, and
wanting to timestamp external events with the synchronized time base
simultaneously.

Timestmp event consumers on the other hand, are often interested in a
subset of the available timestamp channels. linuxptp ts2phc, for example,
is not happy if more than one timestamping channel is active on the device
it is reading from.

Linked lists are introduced to support multiple timestamp event queue
consumers, and timestamp event channel filters through IOCTLs, as well as
a debugfs interface to do some simple verifications.

Xabier Marquiegui (6):
  posix-clock: introduce posix_clock_context concept
  ptp: Replace timestamp event queue with linked list
  ptp: support multiple timestamp event readers
  ptp: support event queue reader channel masks
  ptp: add debugfs interface to see applied channel masks
  ptp: add testptp mask test

 drivers/ptp/ptp_chardev.c                   | 129 ++++++++++++++++----
 drivers/ptp/ptp_clock.c                     |  45 ++++++-
 drivers/ptp/ptp_private.h                   |  28 +++--
 drivers/ptp/ptp_sysfs.c                     |  13 +-
 include/linux/posix-clock.h                 |  35 ++++--
 include/uapi/linux/ptp_clock.h              |   2 +
 kernel/time/posix-clock.c                   |  36 ++++--
 tools/testing/selftests/ptp/ptpchmaskfmt.sh |  14 +++
 tools/testing/selftests/ptp/testptp.c       |  19 ++-
 9 files changed, 261 insertions(+), 60 deletions(-)
 create mode 100644 tools/testing/selftests/ptp/ptpchmaskfmt.sh

---
v6:
  - correct commit message
  - correct coding style
v5: https://lore.kernel.org/netdev/cover.1696804243.git.reibax@gmail.com/
  - fix spelling on commit message
  - fix memory leak on ptp_open
v4: https://lore.kernel.org/netdev/cover.1696511486.git.reibax@gmail.com/
  - split modifications in different patches for improved organization
  - rename posix_clock_user to posix_clock_context
  - remove unnecessary flush_users clock operation
  - remove unnecessary tests
  - simpler queue clean procedure
  - fix/clean comment lines
  - simplified release procedures
  - filter modifications exclusive to currently open instance for
    simplicity and security
  - expand mask to 2048 channels
  - make more secure and simple: mask is only applied to the testptp
    instance. Use debugfs to verify effects.
v3: https://lore.kernel.org/netdev/20230928133544.3642650-1-reibax@gmail.com/
  - add this patchset overview file
  - fix use of safe and non safe linked lists for loops
  - introduce new posix_clock private_data and ida object ids for better
    dicrimination of timestamp consumers
  - safer resource release procedures
  - filter application by object id, aided by process id
  - friendlier testptp implementation of event queue channel filters
v2: https://lore.kernel.org/netdev/20230912220217.2008895-1-reibax@gmail.com/
  - fix ptp_poll() return value
  - Style changes to comform to checkpatch strict suggestions
  - more coherent ptp_read error exit routines
  - fix testptp compilation error: unknown type name 'pid_t'
  - rename mask variable for easier code traceability
  - more detailed commit message with two examples
v1: https://lore.kernel.org/netdev/20230906104754.1324412-2-reibax@gmail.com/
====================
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add option to test timestamp event queue mask manipulation in testptp.

Option -F allows the user to specify a single channel that will be
applied on the mask filter via IOCTL.

The test program will maintain the file open until user input is
received.

This allows checking the effect of the IOCTL in debugfs.

eg:

Console 1:
```
Channel 12 exclusively enabled. Check on debugfs.
Press any key to continue
```

Console 2:
```
0x00000000 0x00000001 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000
```
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use debugfs to be able to view channel mask applied to every timestamp
event queue.

Every time the device is opened, a new entry is created in
`$DEBUGFS_MOUNTPOINT/ptpN/$INSTANCE_ADDRESS/mask`.

The mask value can be viewed grouped in 32bit decimal values using cat,
or converted to hexadecimal with the included `ptpchmaskfmt.sh` script.
32 bit values are listed from least significant to most significant.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

On systems with multiple timestamp event channels, some readers might
want to receive only a subset of those channels.

Add the necessary modifications to support timestamp event channel
filtering, including two IOCTL operations:

- Clear all channels
- Enable one channel

The mask modification operations will be applied exclusively on the
event queue assigned to the file descriptor used on the IOCTL operation,
so the typical procedure to have a reader receiving only a subset of the
enabled channels would be:

- Open device file
- ioctl: clear all channels
- ioctl: enable one channel
- start reading

Calling the enable one channel ioctl more than once will result in
multiple enabled channels.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use linked lists to create one event queue per open file. This enables
simultaneous readers for timestamp event queues.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Introduce linked lists to access the timestamp event queue.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the necessary structure to support custom private-data per
posix-clock user.

The previous implementation of posix-clock assumed all file open
instances need access to the same clock structure on private_data.

The need for individual data structures per file open instance has been
identified when developing support for multiple timestamp event queue
users for ptp_clock.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Arkadiusz Kubalewski says:

====================
dpll: add phase-offset and phase-adjust

Improve monitoring and control over dpll devices.
Allow user to receive measurement of phase difference between signals
on pin and dpll (phase-offset).
Allow user to receive and control adjustable value of pin's signal
phase (phase-adjust).

v4->v5:
- rebase series on top of net-next/main, fix conflict - remove redundant
  attribute type definition in subset definition

v3->v4:
- do not increase do version of uAPI header as it is not needed (v3 did
  not have this change)
- fix spelling around commit messages, argument descriptions and docs
- add missing extack errors on failure set callbacks for pin phase
  adjust and frequency
- remove ice check if value is already set, now redundant as checked in
  the dpll subsystem

v2->v3:
- do not increase do version of uAPI header as it is not needed

v1->v2:
- improve handling for error case of requesting the phase adjust set
- align handling for error case of frequency set request with the
approach introduced for phase adjust
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Align the approach of pin frequency set behavior with the approach
introduced with pin phase adjust set.
Fail the request if any of devices did not registered the callback ops.
If callback op on any pin's registered device fails, return error and
rollback the value to previous one.
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Implement new callback ops related to measurement and adjustment of
signal phase for pin-dpll in ice driver.
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add callback ops for pin-dpll phase measurement.
Add callback for pin signal phase adjustment.
Add min and max phase adjustment values to pin proprties.
Invoke callbacks in dpll_netlink.c when filling the pin details to
provide user with phase related attribute values.
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add attributes for providing the user with:
- measurement of signals phase offset between pin and dpll
- ability to adjust the phase of pin signal
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add documentation on:
- measurement of phase of signal between pin and dpll
- adjustment of pin signal phase
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Ivan Vecera says:

====================
i40e: Add basic devlink support

The series adds initial support for devlink to i40e driver.

Patch-set overview:
Patch 1: Adds initial devlink support (devlink and port registration)
Patch 2: Refactors and split i40e_nvm_version_str()
Patch 3: Adds support for 'devlink dev info'
Patch 4: Refactors existing helper function to read PBA ID
Patch 5: Adds 'board.id' to 'devlink dev info' using PBA ID
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Expose stored PBA ID string as unique board identifier via
devlink's .info_get command.
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Function i40e_read_pba_string() is currently unused but will be used
by subsequent patch to provide board ID via devlink device info.

The function reads PBA block from NVM so it cannot be called during
adapter reset and as we would like to provide PBA ID via devlink
info it is better to read the PBA ID during i40e_probe() and cache
it in i40e_hw structure to avoid a waiting for potential adapter
reset in devlink info callback.

So...
- Remove pba_num and pba_num_size arguments from the function,
  allocate resource managed buffer to store PBA ID string and
  save resulting pointer to i40e_hw->pba_id field
- Make the function void as the PBA ID can be missing and in this
  case (or in case of NVM reading failure) the i40e_hw->pba_id
  will be NULL
- Rename the function to i40e_get_pba_string() to align with other
  functions like i40e_get_oem_version() i40e_get_port_mac_addr()...
- Call this function on init during i40e_probe()
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Provide devlink .info_get callback to allow the driver to report
detailed version information. The following info is reported:

 "serial_number" -> The PCI DSN of the adapter
 "fw.mgmt" -> The version of the firmware
 "fw.mgmt.api" -> The API version of interface exposed over the AdminQ
 "fw.psid" -> The version of the NVM image
 "fw.bundle_id" -> Unique identifier for the combined flash image
 "fw.undi" -> The combo image version

With this, 'devlink dev info' provides at least the same amount
information as is reported by ETHTOOL_GDRVINFO:

$ ethtool -i enp2s0f0 | egrep '(driver|firmware)'
driver: i40e
firmware-version: 9.30 0x8000e5f3 1.3429.0

$ devlink dev info pci/0000:02:00.0
pci/0000:02:00.0:
  driver i40e
  serial_number c0-de-b7-ff-ff-ef-ec-3c
  versions:
      running:
        fw.mgmt 9.130.73618
        fw.mgmt.api 1.15
        fw.psid 9.30
        fw.bundle_id 0x8000e5f3
        fw.undi 1.3429.0
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The function formats NVM version string according adapter's
EETrackID value. If this value OEM specific (0xffffffff) then
the reported version is with format:
"<gen>.<snap>.<release>"
and in other case
"<nvm_maj>.<nvm_min> <eetrackid> <cvid_maj>.<cvid_bld>.<cvid_min>"

These versions are reported in the subsequent patch in this series
that implements devlink .info_get but separately.

So split the function into separate ones, refactor it to use them
and remove ugly static string buffer.
Additionally convert NVM/OEM version mask macros to use GENMASK and
use FIELD_GET/FIELD_PREP for them in i40e_nvm_version_str() and
i40e_get_oem_version(). This makes code more readable and allows
us to remove related shift macros.
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add an initial support for devlink interface to i40e driver.

Similarly to ice driver the implementation doe not enable devlink
to manage device-wide configuration and devlink instance is created
for each physical function of PCIe device.
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When we are trying to timestamp a TX packet, there may be
occasions when the TX timestamp register is still not
updated with the latest timestamp even if the timestamp
packet descriptor is marked as complete.
This usually happens in cases where the system is under
stress or flow control is affecting the transmit side.

We will solve this problem by saving the snapshot of the
timestamp register when we are posting the TX descriptor.
At this time, the register contains previously timestamped
packet's value and valid timestamp of the current packet must
be different than this.
Upon completion of the current descriptor, we will check if
the timestamp register is updated or not before timestamping
the skb. If not updated, we will schedule the ptp worker to
fetch the updated time later and timestamp the skb.
Also now we restrict number of outstanding PTP TX packet
requests to 1.
Reported-by: Simon White <Simon.White@viavisolutions.com>
Link: https://lore.kernel.org/netdev/CACKFLikGdN9XPtWk-fdrzxdcD=+bv-GHBvfVfSpJzHY7hrW39g@mail.gmail.com/Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a section to netdev maintainer doc encouraging reviewers
to chime in on the mailing list.

The questions about "when is it okay to share feedback"
keep coming up (most recently at netconf) and the answer
is "pretty much always".

Extend the section of 7.AdvancedTopics.rst which deals
with reviews a little bit to add stuff we had been recommending
locally.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Edward Cree says:

====================
sfc: support conntrack NAT offload

The EF100 MAE supports performing NAT (and NPT) on packets which match in
 the conntrack table.  This series adds that capability to the driver.
====================
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

If an IP address and/or L4 port for NAPT is available from a CT match,
 the MAE will perform the edits; if no CT lookup has been performed for
 this packet, the CT lookup did not return a match, or the matched CT
 entry did not include NAPT, the action will have no effect.
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The MAE can edit either address, L4 port, or both, for either source
 or destination.  These can't be mixed; i.e. it can edit source addr
 and source port, but not (say) source addr and dest port.
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>