Petr Machata says:

====================
Add a new Qdisc, ETS

The IEEE standard 802.1Qaz (and 802.1Q-2014) specifies four principal
transmission selection algorithms: strict priority, credit-based shaper,
ETS (bandwidth sharing), and vendor-specific. All these have their
corresponding knobs in DCB. But DCB does not have interfaces to configure
RED and ECN, unlike Qdiscs.

In the Qdisc land, strict priority is implemented by PRIO. Credit-based
transmission selection algorithm can then be modeled by having e.g. TBF or
CBS Qdisc below some of the PRIO bands. ETS would then be modeled by
placing a DRR Qdisc under the last PRIO band.

The problem with this approach is that DRR on its own, as well as the
combination of PRIO and DRR, are tricky to configure and tricky to offload
to 802.1Qaz-compliant hardware. This is due to several reasons:

- As any classful Qdisc, DRR supports adding classifiers to decide in which
  class to enqueue packets. Unlike PRIO, there's however no fallback in the
  form of priomap. A way to achieve classification based on packet priority
  is e.g. like this:

    # tc filter add dev swp1 root handle 1: \
		basic match 'meta(priority eq 0)' flowid 1:10

  Expressing the priomap in this manner however forces drivers to deep dive
  into the classifier block to parse the individual rules.

  A possible solution would be to extend the classes with a "defmap" a la
  split / defmap mechanism of CBQ, and introduce this as a last resort
  classification. However, unlike priomap, this doesn't have the guarantee
  of covering all priorities. Traffic whose priority is not covered is
  dropped by DRR as unclassified. But ASICs tend to implement dropping in
  the ACL block, not in scheduling pipelines. The need to treat these
  configurations correctly (if only to decide to not offload at all)
  complicates a driver.

  It's not clear how to retrofit priomap with all its benefits to DRR
  without changing it beyond recognition.

- The interplay between PRIO and DRR is also causing problems. 802.1Qaz has
  all ETS TCs as a last resort. Switch ASICs that support ETS at all are
  likely to handle ETS traffic this way as well. However, the Linux model
  is more generic, allowing the DRR block in any band. Drivers would need
  to be careful to handle this case correctly, otherwise the offloaded
  model might not match the slow-path one.

  In a similar vein, PRIO and DRR need to agree on the list of priorities
  assigned to DRR. This is doubly problematic--the user needs to take care
  to keep the two in sync, and the driver needs to watch for any holes in
  DRR coverage and treat the traffic correctly, as discussed above.

  Note that at the time that DRR Qdisc is added, it has no classes, and
  thus any priorities assigned to that PRIO band are not covered. Thus this
  case is surprisingly rather common, and needs to be handled gracefully by
  the driver.

- Similarly due to DRR flexibility, when a Qdisc (such as RED) is attached
  below it, it is not immediately clear which TC the class represents. This
  is unlike PRIO with its straightforward classid scheme. When DRR is
  combined with PRIO, the relationship between classes and TCs gets even
  more murky.

  This is a problem for users as well: the TC mapping is rather important
  for (devlink) shared buffer configuration and (ethtool) counters.

So instead, this patch set introduces a new Qdisc, which is based on
802.1Qaz wording. It is PRIO-like in how it is configured, meaning one
needs to specify how many bands there are, how many are strict and how many
are ETS, quanta for the latter, and priomap.

The new Qdisc operates like the PRIO / DRR combo would when configured as
per the standard. The strict classes, if any, are tried for traffic first.
When there's no traffic in any of the strict queues, the ETS ones (if any)
are treated in the same way as in DRR.

The chosen interface makes the overall system both reasonably easy to
configure, and reasonably easy to offload. The extra code to support ETS in
mlxsw (which already supports PRIO) is about 150 lines, of which perhaps 20
lines is bona fide new business logic.

Credit-based shaping transmission selection algorithm can be configured by
adding a CBS Qdisc under one of the strict bands (e.g. TBF can be used to a
similar effect as well). As a non-work-conserving Qdisc, CBS can't be
hooked under the ETS bands. This is detected and handled identically to DRR
Qdisc at runtime. Note that offloading CBS is not subject of this patchset.

The patchset proceeds in four stages:

- Patches #1-#3 are cleanups.
- Patches #4 and #5 contain the new Qdisc.
- Patches #6 and #7 update mlxsw to offload the new Qdisc.
- Patches #8-#10 add selftests for ETS.

Examples:

- Add a Qdisc with 6 bands, 3 strict and 3 ETS with 45%-30%-25% weights:

    # tc qdisc add dev swp1 root handle 1: \
	ets strict 3 quanta 4500 3000 2500 priomap 0 1 1 1 2 3 4 5
    # tc qdisc sh dev swp1
    qdisc ets 1: root refcnt 2 bands 6 strict 3 quanta 4500 3000 2500 priomap 0 1 1 1 2 3 4 5 5 5 5 5 5 5 5 5

- Tweak quantum of one of the classes of the previous Qdisc:

    # tc class ch dev swp1 classid 1:4 ets quantum 1000
    # tc qdisc sh dev swp1
    qdisc ets 1: root refcnt 2 bands 6 strict 3 quanta 1000 3000 2500 priomap 0 1 1 1 2 3 4 5 5 5 5 5 5 5 5 5
    # tc class ch dev swp1 classid 1:3 ets quantum 1000
    Error: Strict bands do not have a configurable quantum.

- Purely strict Qdisc with 1:1 mapping between priorities and TCs:

    # tc qdisc add dev swp1 root handle 1: \
	ets strict 8 priomap 7 6 5 4 3 2 1 0
    # tc qdisc sh dev swp1
    qdisc ets 1: root refcnt 2 bands 8 strict 8 priomap 7 6 5 4 3 2 1 0 7 7 7 7 7 7 7 7

- Use "bands" to specify number of bands explicitly. Underspecified bands
  are implicitly ETS and their quantum is taken from MTU. The following
  thus gives each band the same weight:

    # tc qdisc add dev swp1 root handle 1: \
	ets bands 8 priomap 7 6 5 4 3 2 1 0
    # tc qdisc sh dev swp1
    qdisc ets 1: root refcnt 2 bands 8 quanta 1514 1514 1514 1514 1514 1514 1514 1514 priomap 7 6 5 4 3 2 1 0 7 7 7 7 7 7 7 7

v2:
- This addresses points raised by David Miller.
- Patch #4:
    - sch_ets.c: Add a comment with description of the Qdisc and the
      dequeuing algorithm.
    - Kconfig: Add a high-level description to the help blurb.

v1:
- No changes, first upstream submission after RFC.

v3 (internal):
- This addresses review from Jiri Pirko.
- Patch #3:
    - Rename to _HR_ instead of to _HIERARCHY_.
- Patch #4:
    - pkt_sched.h: Keep all the TCA_ETS_ constants in one enum.
    - pkt_sched.h: Rename TCA_ETS_BANDS to _NBANDS, _STRICT to _NSTRICT,
      _BAND_QUANTUM to _QUANTA_BAND and _PMAP_BAND to _PRIOMAP_BAND.
    - sch_ets.c: Update to reflect the above changes. Add a new policy,
      ets_class_policy, which is used when parsing class changes.
      Currently that policy is the same as the quanta policy, but that
      might change.
    - sch_ets.c: Move MTU handling from ets_quantum_parse() to the one
      caller that makes use of it.
    - sch_ets.c: ets_qdisc_priomap_parse(): WARN_ON_ONCE on invalid
      attribute instead of returning an extack.
- Patch #6:
    - __mlxsw_sp_qdisc_ets_replace(): Pass the weights argument to this
      function in this patch already. Drop the weight computation.
    - mlxsw_sp_qdisc_prio_replace(): Rename "quanta" to "zeroes" and
      pass for the abovementioned "weights".
    - mlxsw_sp_qdisc_prio_graft(): Convert to a wrapper around
      __mlxsw_sp_qdisc_ets_graft(), instead of invoking the latter
      directly from mlxsw_sp_setup_tc_prio().
    - Update to follow the _HIERARCHY_ -> _HR_ renaming.
- Patch #7:
    - __mlxsw_sp_qdisc_ets_replace(): The "weights" argument passing and
      weight computation removal are now done in a previous patch.
    - mlxsw_sp_setup_tc_ets(): Drop case TC_ETS_REPLACE, which is handled
      earlier in the function.
- Patch #3 (iproute2):
    - Add an example output to the commit message.
    - tc-ets.8: Fix output of two examples.
    - tc-ets.8: Describe default values of "bands", "quanta".
    - q_ets.c: A number of fixes in error messages.
    - q_ets.c: Comment formatting: /*padding*/ -> /* padding */
    - q_ets.c: parse_nbands: Move duplicate checking to callers.
    - q_ets.c: Don't accept both "quantum" and "quanta" as equivalent.

v2 (internal):
- This addresses review from Ido Schimmel and comments from Alexander
  Kushnarov.
- Patch #2:
    - s/coment/comment in the commit message.
- Patch #4:
    - sch_ets: ets_class_is_strict(), ets_class_id(): Constify an argument
    - ets_class_find(): RXTify
- Patch #3 (iproute2):
    - tc-ets.8: some spelling fixes
    - tc-ets.8: add another example
    - tc.8: add an ETS to "CLASSFUL QDISCS" section

v1 (internal):
- This addresses RFC reviews from Ido Schimmel and Roman Mashak, bugs found
  by Alexander Petrovskiy and myself, and other improvements.
- Patch #2:
    - Expand the explanation with an explicit example.
- Patch #4:
    - Kconfig: s/sch_drr/sch_ets/
    - sch_ets: Reorder includes to be in alphabetical order
    - sch_ets: ets_quantum_parse(): Rename the return-pointer argument
      from pquantum to quantum, and use it directly, not going through a
      local temporary.
    - sch_ets: ets_qdisc_quanta_parse(): Convert syntax of function
      argument "quanta" from an array to a pointer.
    - sch_ets: ets_qdisc_priomap_parse(): Likewise with "priomap".
    - sch_ets: ets_qdisc_quanta_parse(), ets_qdisc_priomap_parse(): Invoke
      __nla_validate_nested directly instead of nl80211_validate_nested().
    - sch_ets: ets_qdisc_quanta_parse(): WARN_ON_ONCE on invalid attribute
      instead of returning an extack.
    - sch_ets: ets_qdisc_change(): Make the last band the default one for
      unmentioned priomap priorities.
    - sch_ets: Fix a panic when an offloaded child in a bandwidth-sharing
      band notified its ETS parent.
    - sch_ets: When ungrafting, add the newly-created invisible FIFO to
      the Qdisc hash
- Patch #5:
    - pkt_cls.h: Note that quantum=0 signifies a strict band.
    - Fix error path handling when ets_offload_dump() fails.
- Patch #6:
    - __mlxsw_sp_qdisc_ets_replace(): Convert syntax of function arguments
      "quanta" and "priomap" from arrays to pointers.
- Patch #7:
    - __mlxsw_sp_qdisc_ets_replace(): Convert syntax of function argument
      "weights" from an array to a pointer.
- Patch #9:
    - mlxsw/sch_ets.sh: Add a comment explaining packet prioritization.
    - Adjust the whole suite to allow testing of traffic classifiers
      in addition to testing priomap.
- Patch #10:
    - Add a number of new tests to test default priomap band, overlarge
      number of bands, zeroes in quanta, and altogether missing quanta.
- Patch #1 (iproute2):
    - State motivation for inclusion of this patch in the patcheset in the
      commit message.
- Patch #3 (iproute2):
    - tc-ets.8: it is now December
    - tc-ets.8: explain inactivity WRT using non-WC Qdiscs under ETS band
    - tc-ets.8: s/flow/band in explanation of quantum
    - tc-ets.8: explain what happens with priorities not covered by priomap
    - tc-ets.8: default priomap band is now the last one
    - q_ets.c: ets_parse_opt(): Remove unnecessary initialization of
      priomap and quanta.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add TDC coverage for the new ETS Qdisc.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This tests the newly-added ETS Qdisc. It runs two to three streams of
traffic, each with a different priority. ETS Qdisc is supposed to allocate
bandwidth according to the DRR algorithm and given weights. After running
the traffic for a while, counters are compared for each stream to check
that the expected ratio is in fact observed.

In order for the DRR process to kick in, a traffic bottleneck must exist in
the first place. In slow path, such bottleneck can be implemented by
wrapping the ETS Qdisc inside a TBF or other shaper. This might however
make the configuration unoffloadable. Instead, on HW datapath, the
bottleneck would be set up by lowering port speed and configuring shared
buffer suitably.

Therefore the test is structured as a core component that implements the
testing, with two wrapper scripts that implement the details of slow path
resp. fast path configuration.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

These two functions are used for starting several streams of traffic, and
then stopping them later. They will be handy for the test coverage of ETS
Qdisc. Move them from mlxsw-specific qos_lib.sh to the generic lib.sh.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Handle TC_SETUP_QDISC_ETS, add a new ops structure for the ETS Qdisc.
Invoke the extended prio handlers implemented in the previous patch. For
stats ops, invoke directly the prio callbacks, which are not sensitive to
differences between PRIO and ETS.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Thanks to the similarity between PRIO and ETS it is possible to simply
reuse most of the code for offloading PRIO Qdisc. Extract the common
functionality into separate functions, making the current PRIO handlers
thin API adapters.

Extend the new functions to pass quanta for individual bands, which allows
configuring a subset of bands as WRR. Invoke mlxsw_sp_port_ets_set() as
appropriate to de/configure WRR-ness and weight of individual bands.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add hooks at appropriate points to make it possible to offload the ETS
Qdisc.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Introduces a new Qdisc, which is based on 802.1Q-2014 wording. It is
PRIO-like in how it is configured, meaning one needs to specify how many
bands there are, how many are strict and how many are dwrr, quanta for the
latter, and priomap.

The new Qdisc operates like the PRIO / DRR combo would when configured as
per the standard. The strict classes, if any, are tried for traffic first.
When there's no traffic in any of the strict queues, the ETS ones (if any)
are treated in the same way as in DRR.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

These enums want to be named MLXSW_REG_QEEC_HIERARCHY_, but due to a typo
lack the second H. That is confusing and complicates searching.

But actually the enumerators should be named _HR_, because that is how
their enum type is called. So rename them as appropriate.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Expand the comment at mlxsw_sp_qdisc_prio_graft() to make the problem that
this function is trying to handle clearer.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The bit about negating HW backlog left me scratching my head. Clarify the
comment.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Turns out tin_quantum_prio isn't used anymore and is a leftover from a
previous implementation of diffserv tins.  Since the variable isn't used
in any calculations it can be eliminated.

Drop variable and places where it was set.  Rename remaining variable
and consolidate naming of intermediate variables that set it.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Julian Wiedmann says:

====================
s390/qeth: features 2019-12-18

please apply the following patch series to your net-next tree.
Nothing major, just the usual mix of small improvements and cleanups.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

qeth_qdio_start_poll() is called from the qdio layer's IRQ handler,
while IRQs are masked.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Convert the old code to use struct qeth_ipa_caps, and while at it remove
all unused helper macros.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

As commit df2a2a52 ("s390/qeth: convert IP table spinlock to mutex")
converted the ip_lock to a mutex, we no longer have to yield it while
the subsequent IO sleep-waits for completion.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This is a leftover from back when a recovery action didn't go through
dev_close(), and was meant to shoot down all remaining af_iucv sockets
on the interface.

Now that the offline path always calls dev_close(), the
NETDEV_GOING_DOWN event from __dev_close_many() is sufficient and this
hack can be removed.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use inet_make_mask() to replace some complicated bit-fiddling.

Also use the right data types to replace some raw memcpy calls with
proper assignments.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Consolidate some duplicated code for adding RXIP/VIPA addresses, and
move the locking to where it's actually needed.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The current code that dumps the RXIP/VIPA/IPATO addresses via sysfs
first checks whether the buffer still provides sufficient space to hold
another formatted address.
But the maximum length of an formatted IPv4 address is 15 characters,
not 12. So we underestimate the max required length and if the buffer
was previously filled to _just_ the right level, a formatted address can
end up being truncated.

Revamp these code paths to use the _actually_ required length of the
formatted IP address, and while at it suppress a gratuitous newline.

Also use scnprintf() to format the output. In case of a truncation, this
would allow us to return the number of characters that were actually
written.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

card->wait_q is shared by different users, for different wake-up
conditions. qeth_irq() can potentially trigger multiple of these
conditions:
1) A change to channel->irq_pending, which qeth_send_control_data() is
   waiting for.
2) A change to card->state, which qeth_clear_channel() and
   qeth_halt_channel() are waiting for.

As qeth_irq() does only a single wake_up(), we might miss to wake up
a second eligible waiter. Luckily all waiters are guarded with a
timeout, so this situation should recover on its own eventually.

To make things work robustly, add an additional wake_up() for changes
to channel->state. And extract a helper that updates
channel->irq_pending along with the needed wake_up().
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

A qeth device that's offline should not be receiving any IRQs - all
pending IOs have been terminated, and we avoid starting any new ones.

So rather than immediately registering the IRQ handler when the device
is probed, only register it while the device is online.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jose Abreu says:

====================
net: stmmac: TSN support using TAPRIO API

This series adds TSN support (EST and Frame Preemption) for stmmac driver.

1) Adds the HW specific support for EST in GMAC5+ cores.

2) Adds the HW specific support for EST in XGMAC3+ cores.

3) Integrates EST HW specific support with TAPRIO scheduler API.

4) Adds the Frame Preemption suppor on stmmac TAPRIO implementation.

5) Adds the HW specific support for Frame Preemption in GMAC5+ cores.

6) Adds the HW specific support for Frame Preemption in XGMAC3+ cores.

7) Adds support for HW debug counters for Frame Preemption available in
GMAC5+ cores.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

This can be useful for debug. Add these counters on GMAC5+ cores just
like we did for XGMAC.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds the HW specific support for Frame Preemption on XGMAC3+ cores.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds the HW specific support for Frame Preemption on GMAC5+ cores.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds the support for Frame Preemption using TAPRIO API. This works along
with EST feature and allows to select if preemptable traffic shall be
sent during specific queues opening time.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Now that we have the EST code for XGMAC and QoS we can use it with the
TAPRIO scheduler. Integrate it into the main driver and use the API to
configure the EST feature.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds the support for EST in XGMAC cores. This feature allows to offload
scheduling of queues opening time to the IP.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds the support for EST in GMAC5+ cores. This feature allows to offload
scheduling of queues opening time to the IP.
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jose Abreu says:

====================
net: stmmac: Improvements for -next

Misc improvements for stmmac.

1) Adds more information regarding HW Caps in the DebugFS file.

2) Allows interrupts to be independently enabled or disabled so that we don't
have to schedule both TX and RX NAPIs.

3) Stops using a magic number in coalesce timer re-arm.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

When we have pending packets we re-arm the TX timer with a magic value.

This changes the re-arm of the timer from 10us to the user-defined
coalesce value. As we support different speeds, having a magic value of
10us can be either too short or to large depending on the speed so we
let user configure it. The default value of the timer is 1ms but it can
be reconfigured by ethtool.

Changes from v1:
- Reword commit message (Jakub)
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

By using this mechanism we can get rid of the not so nice method of
scheduling TX NAPI when the RX was scheduled. No bandwidth reduction was
seen with this change.

Changes from v1:
- Remove useless comment (Jakub)
- Do not bind the TX clean to NAPI budget (Jakub)
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

DMA Capabilites have grown but the DebugFS that shows this info has not
been updated. Lets add the missing information.
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Removing the 'hotplug-status' node in netback_remove() is wrong; the script
may not have completed. Only remove the node once the watch has fired and
has been unregistered.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

...as the comment above the function states.

The switch to Initialising at the start of the function is somewhat bogus
as the toolstack will have set that initial state anyway. To behave
correctly, a backend should switch to InitWait once it has set up all
xenstore values that may be required by a initialising frontend. This
patch calls backend_switch_state() to make the transition at the
appropriate point.

NOTE: backend_switch_state() ignores errors from xenbus_switch_state()
      and so this patch removes an error path from netback_probe(). This
      means a failure to change state at this stage (in the absence of
      other failures) will leave the device instantiated. This is highly
      unlikley to happen as a failure to change state would indicate a
      failure to write to xenstore, and that will trigger other error
      paths. Also, a 'stuck' device can still be cleaned up using 'unbind'
      in any case.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

...of xenbus.c

This is a cosmetic function re-ordering to reduce churn in a subsequent
patch. Some style fix-up was done to make checkpatch.pl happier.

No functional change.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Shahjada Abul Husain says:

====================
cxgb4/chtls: fix issues related to high priority region

The high priority region introduced by:

commit c2193999 ("cxgb4: add support for high priority filters")

had caused regression in some code paths, leading to connection
failures for the ULDs.

This series of patches attempt to fix the regressions.

Patch 1 fixes some code paths that have been missed to consider
the high priority region.

Patch 2 fixes ULD connection failures due to wrong TID base that
had been shifted after the high priority region.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently, the hardware TID index is assumed to start from index 0.
However, with the following changeset,

commit c2193999 ("cxgb4: add support for high priority filters")

hardware TID index can start after the high priority region, which
has introduced a regression resulting in connection failures for
ULDs.

So, fix all related code to properly recalculate the TID start index
based on whether high priority filters are enabled or not.

Fixes: c2193999 ("cxgb4: add support for high priority filters")
Signed-off-by: Shahjada Abul Husain <shahjada@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

commit c2193999 ("cxgb4: add support for high priority filters")
has missed considering high priority region calculation in some code
paths. This patch fixes them.

Fixes: c2193999 ("cxgb4: add support for high priority filters")
Signed-off-by: Shahjada Abul Husain <shahjada@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>