Test different encapsulation modes of the bareudp module:
  * Unicast MPLS,
  * IPv4 only,
  * IPv4 in multiproto mode (that is, IPv4 and IPv6),
  * IPv6.

Each mode is tested with both an IPv4 and an IPv6 underlay.

v2:
  * Add build dependencies in config file (Willem de Bruijn).
  * The MPLS test now uses its own IP addresses. This minimises
    the amount of cleanup between tests and simplifies the script.
  * Verify that iproute2 supports bareudp tunnels before running the
    script (and other minor usability improvements).
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Link: https://lore.kernel.org/r/8abc0e58f8a7eeb404f82466505a73110bc43ab8.1604088587.git.gnault@redhat.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Ivan Mikhaylov says:

====================
add ast2400/2500 phy-handle support

This patch introduces ast2400/2500 phy-handle support with an embedded
MDIO controller. At the current moment it is not possible to set options
with this format on ast2400/2500:

mac {
	phy-handle = <&phy>;
	phy-mode = "rgmii";

	mdio {
		#address-cells = <1>;
		#size-cells = <0>;

		phy: ethernet-phy@0 {
			compatible = "ethernet-phy-idxxxx.yyyy";
			reg = <0>;
		};
	};
};

The patch fixes it and gets possible PHYs and register them with
of_mdiobus_register.

Changes from v3:
   1. add dt-bindings description of MDIO node and phy-handle option
      with example.

Changes from v2:
   1. change manual phy interface type check on phy_interface_mode_is_rgmii
      function.
   2. add err_phy_connect label.
   3. split ftgmac100_destroy_mdio into ftgmac100_phy_disconnect and
      ftgmac100_destroy_mdio.
   4. remove unneeded mdio_np checks.

Changes from v1:
   1. split one patch into two.
====================

Link: https://lore.kernel.org/r/20201030133707.12099-1-i.mikhaylov@yadro.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Add the phy-handle and MDIO description and add the example with
PHY and MDIO nodes.
Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

phy-handle can't be handled well for ast2400/2500 which has an embedded
MDIO controller. Add ftgmac100_mdio_setup for ast2400/2500 and initialize
PHYs from mdio child node with of_mdiobus_register.
Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Split MDIO registration and PHY connect into ftgmac100_setup_mdio and
ftgmac100_mii_probe.
Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

The timestamping tool is supporting now only PTPv1 (IEEE-1588 2002) while
modern HW often supports also/only PTPv2.

Hence timestamping tool is still useful for sanity testing of PTP drivers
HW timestamping capabilities it's reasonable to upstate it to support
PTPv2. This patch adds corresponding support which can be enabled by using
new parameter "PTPV2".
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://lore.kernel.org/r/20201029190931.30883-1-grygorii.strashko@ti.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/9p/client.c:420: warning: Function parameter or member 'c' not described in 'p9_client_cb'
net/9p/client.c:420: warning: Function parameter or member 'req' not described in 'p9_client_cb'
net/9p/client.c:420: warning: Function parameter or member 'status' not described in 'p9_client_cb'
net/9p/client.c:568: warning: Function parameter or member 'uidata' not described in 'p9_check_zc_errors'
net/9p/trans_common.c:23: warning: Function parameter or member 'nr_pages' not described in 'p9_release_pages'
net/9p/trans_common.c:23: warning: Function parameter or member 'pages' not described in 'p9_release_pages'
net/9p/trans_fd.c:132: warning: Function parameter or member 'rreq' not described in 'p9_conn'
net/9p/trans_fd.c:132: warning: Function parameter or member 'wreq' not described in 'p9_conn'
net/9p/trans_fd.c:56: warning: Function parameter or member 'privport' not described in 'p9_fd_opts'
net/9p/trans_rdma.c:113: warning: Function parameter or member 'cqe' not described in 'p9_rdma_context'
net/9p/trans_rdma.c:129: warning: Function parameter or member 'privport' not described in 'p9_rdma_opts'
net/9p/trans_virtio.c:215: warning: Function parameter or member 'limit' not described in 'pack_sg_list_p'
net/9p/trans_virtio.c:83: warning: Function parameter or member 'chan_list' not described in 'virtio_chan'
net/9p/trans_virtio.c:83: warning: Function parameter or member 'p9_max_pages' not described in 'virtio_chan'
net/9p/trans_virtio.c:83: warning: Function parameter or member 'ring_bufs_avail' not described in 'virtio_chan'
net/9p/trans_virtio.c:83: warning: Function parameter or member 'tag' not described in 'virtio_chan'
net/9p/trans_virtio.c:83: warning: Function parameter or member 'vc_wq' not described in 'virtio_chan'
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Dominique Martinet <asmadeus@codewreck.org>
Link: https://lore.kernel.org/r/20201031182655.1082065-1-andrew@lunn.chSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The commit cited below has changed only the functional prototype of
br_multicast_querier_exists, but forgot to do that for the stub
prototype (the one where CONFIG_BRIDGE_IGMP_SNOOPING is disabled).

Fixes: 955062b0 ("net: bridge: mcast: add support for raw L2 multicast groups")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20201101000845.190009-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

We can safely runtime-suspend the chip if rtl_open() fails. Therefore
switch the error path to use pm_runtime_put_sync() as well.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/aa093b1e-f295-5700-1cb7-954b54dd8f17@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tp->dirty_tx isn't changed outside rtl_tx(). Therefore I see no need
to guarantee a specific order of reading tp->dirty_tx and tp->cur_tx.
Having said that we can remove the memory barrier.
In addition use READ_ONCE() when reading tp->cur_tx because it can
change in parallel to rtl_tx().
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/2264563a-fa9e-11b0-2c42-31bc6b8e2790@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Correct a typo in ne.c and ne2k-pci.c which
prevented activation of the RW-Bugfix.
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20201029143357.7008-1-W_Armin@gmx.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

This patch adds support for 10GBASE-R interface to the linux driver for
Cadence's ethernet controller.
This controller has separate MAC's and PCS'es for low and high speed paths.
High speed PCS supports 100M, 1G, 2.5G, 5G and 10G through rate adaptation
implementation. However, since it doesn't support auto negotiation, linux
driver is modified to support 10GBASE-R instead of USXGMII.
Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
Link: https://lore.kernel.org/r/1603975627-18338-1-git-send-email-pthombar@cadence.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

To allow better problem diagnosis the return codes for SMC-Dv2 are
improved by this patch. A few more CLC DECLINE codes are defined and
sent to the peer when an SMC connection cannot be established.
There are now multiple SMC variations that are offered by the client and
the server may encounter problems to initialize all of them.
Because only one diagnosis code can be sent to the client the decision
was made to send the first code that was encountered. Because the server
tries the variations in the order of importance (SMC-Dv2, SMC-D, SMC-R)
this makes sure that the diagnosis code of the most important variation
is sent.

v2: initialize rc in smc_listen_v2_check().
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20201031181938.69903-1-kgraul@linux.ibm.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Subbaraya Sundeep says:

====================
Support for OcteonTx2 98xx silicon

OcteonTx2 series of silicons have multiple variants, the
98xx variant has two network interface controllers (NIX blocks)
each of which supports upto 100Gbps. Similarly 98xx supports
two crypto blocks (CPT) to double the crypto performance.
The current RVU drivers support a single NIX and
CPT blocks, this patchset adds support for multiple
blocks of same type to be active at the same time.

Also the number of serdes controllers (CGX) have increased
from three to five on 98xx. Each of the CGX block supports
upto 4 physical interfaces depending on the serdes mode ie
upto 20 physical interfaces. At a time each CGX block can
be mapped to a single NIX. The HW configuration to map CGX
and NIX blocks is done by firmware.

NPC has two new interfaces added NIX1_RX and NIX1_TX
similar to NIX0 interfaces. Also MCAM entries is increased
from 4k to 16k. To support the 16k entries extended set
is added in hardware which are at completely different
register offsets. Fortunately new constant registers
can be read to figure out the extended set is present
or not.

This patch set modifies existing AF and PF drivers
in below order to support 98xx:
- Prepare for supporting multiple blocks of same type.
  Functions which operate with block type to get or set
  resources count are modified to operate with block address
- Manage allocating and freeing LFs from new NIX1 and CPT1 RVU blocks.
- NIX block specific initialization and teardown for NIX1
- Based on the mapping set by Firmware, assign the NIX block
  LFs to a PF/VF.
- Multicast entries context is setup for NIX1 along with NIX0
- NPC changes to support extended set of MCAM entries, counters
  and NIX1 interfaces to NPC.
- All the mailbox changes required for the new blocks in 98xx.
- Since there are more CGX links in 98xx the hardcoded LBK
  link value needed by netdev drivers is not sufficient any
  more. Hence AF consumers need to get the number of all links
  and calculate the LBK link.
- Debugfs changes to display NIX1 contexts similar to NIX0
- Debugfs change to display mapping between CGX, NIX and PF.
====================

Link: https://lore.kernel.org/r/1603948549-781-1-git-send-email-sundeep.lkml@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Unlike earlier silicon variants, OcteonTx2 98xx
silicon has 2 NIX blocks and each of the CGX is
mapped to either of the NIX blocks. Each NIX
block supports 100G. Mapping btw NIX blocks and
CGX is done by firmware based on CGX speed config
to have a maximum possible network bandwidth.
Since the mapping is not fixed, it's difficult
for a user to figure out. Hence added a debugfs
entry which displays mapping between CGX LMAC,
NIX block and RVU PF.
Sample result of this entry ::

~# cat /sys/kernel/debug/octeontx2/rvu_pf_cgx_map
PCI dev         RVU PF Func     NIX block       CGX     LMAC
0002:02:00.0    0x400           NIX0            CGX0    LMAC0
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

If NIX1 block is also implemented then add a new
directory for NIX1 in debugfs root. Stats of
NIX1 block can be read/writen from/to the files
in directory "/sys/kernel/debug/octeontx2/nix1/".
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

CGX links are followed by LBK links but number of
CGX and LBK links varies between platforms. Hence
get the number of links present in hardware from
AF and use it to calculate LBK link number.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This patch puts together all mailbox changes
for 98xx silicon:

Attach ->
Modify resource attach mailbox handler to
request LFs from a block address out of multiple
blocks of same type. If a PF/VF need LFs from two
blocks of same type then attach mbox should be
called twice.

Example:
        struct rsrc_attach *attach;
        .. Allocate memory for message ..
        attach->cptlfs = 3; /* 3 LFs from CPT0 */
        .. Send message ..
        .. Allocate memory for message ..
        attach->modify = 1;
        attach->cpt_blkaddr = BLKADDR_CPT1;
        attach->cptlfs = 2; /* 2 LFs from CPT1 */
        .. Send message ..

Detach ->
Update detach mailbox and its handler to detach
resources from CPT1 and NIX1 blocks.

MSIX ->
Updated the MSIX mailbox and its handler to return
MSIX offsets for the new block CPT1.

Free resources ->
Update free_rsrc mailbox and its handler to return
the free resources count of new blocks NIX1 and CPT1

Links ->
Number of CGX,LBK and SDP links may vary between
platforms. For example, in 98xx number of CGX and LBK
links are more than 96xx. Hence the info about number
of links present in hardware is useful for consumers to
request link configuration properly. This patch sends
this info in nix_lf_alloc_rsp.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

On 98xx silicon, NPC block has additional
mcam entries, counters and NIX1 interfaces.
Extended set of registers are present for the
new mcam entries and counters.
This patch does the following:
- updates the register accessing macros
  to use extended set if present.
- configures the MKEX profile for NIX1 interfaces also.
- updates mcam entry write functions to use assigned
  NIX0/1 interfaces for the PF/VF.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Initialize MCE context for the assigned NIX0/1
block for a CGX mapped PF. Modified rvu_nix_aq_enq_inst
function to work with nix_hw so that MCE contexts
for both NIX blocks can be inited.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Firmware configures NIX block mapping for all CGXs
to achieve maximum throughput. This patch reads
the configuration and create mapping between RVU
PF and NIX blocks. And for LBK VFs assign NIX0 for
even numbered VFs and NIX1 for odd numbered VFs.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This patch modifies NIX functions to operate
with nix_hw context so that existing functions
can be used for both NIX0 and NIX1 blocks. And
the NIX blocks present in the system are initialized
during driver init and freed during exit.
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

AF manages the tasks of allocating, freeing
LFs from RVU blocks to PF and VFs. With new
NIX1 and CPT1 blocks in 98xx, this patch
adds support for handling new blocks too.
Co-developed-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Since multiple blocks of same type are present in
98xx, modify functions which get resource count and
which update resource count to work with individual
block address instead of block type.
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Update the axienet driver to properly support the Xilinx PCS/PMA PHY
component which is used for 1000BaseX and SGMII modes, including
properly configuring the auto-negotiation mode of the PHY and reading
the negotiated state from the PHY.
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/20201028171429.1699922-1-robert.hancock@calian.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The previous commit added support for IPA having up to six source
and destination resources.  But currently nothing uses more than
four.  (Five of each are used in a newer version of the hardware.)

I find that in one of my build environments the compiler complains
about newly-added code in two spots.  Inspection shows that the
warnings have no merit, but this compiler does not recognize that.

    ipa_main.c:457:39: warning: array index 5 is past the end of the
        array (which contains 4 elements) [-Warray-bounds]
    (and the same warning at line 483)

We can make this warning go away by changing the number of elements
in the source and destination resource limit arrays--now rather than
waiting until we need it to support the newer hardware.  This change
was coming soon anyway; make it now to get rid of the warning.
Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20201031151524.32132-1-elder@linaro.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Heiner Kallweit says:

====================
net: add functionality to net core byte/packet counters and use it in r8169

This series adds missing functionality to the net core handling of
byte/packet counters and statistics. The extensions are then used
to remove private rx/tx byte/packet counters in r8169 driver.
====================

Link: https://lore.kernel.org/r/1fdb8ecd-be0a-755d-1d92-c62ed8399e77@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

After switching to the net core rx/tx byte/packet counters we can
remove the now unused private version.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Switch to the net core rx/tx byte/packet counter infrastructure.
This simplifies the code, only small drawback is some memory overhead
because we use just one queue, but allocate the counters per cpu.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

We have netdev_alloc_pcpu_stats(), and we have devm_alloc_percpu().
Add a managed version of netdev_alloc_pcpu_stats, e.g. for allocating
the per-cpu stats in the probe() callback of a driver. It needs to be
a macro for dealing properly with the type argument.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Add dev_sw_netstats_tx_add(), complementing already existing
dev_sw_netstats_rx_add(). Other than dev_sw_netstats_rx_add allow to
pass the number of packets as function argument.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Sebastian Andrzej Siewior says:

====================
in_interrupt() cleanup, part 2

in the discussion about preempt count consistency across kernel configurations:

  https://lore.kernel.org/r/20200914204209.256266093@linutronix.de/

Linus clearly requested that code in drivers and libraries which changes
behaviour based on execution context should either be split up so that
e.g. task context invocations and BH invocations have different interfaces
or if that's not possible the context information has to be provided by the
caller which knows in which context it is executing.

This includes conditional locking, allocation mode (GFP_*) decisions and
avoidance of code paths which might sleep.

In the long run, usage of 'preemptible, in_*irq etc.' should be banned from
driver code completely.

This is part two addressing remaining drivers except for orinoco-usb.
====================

Cherry picking only Ethernet changes.

Link: https://lore.kernel.org/r/20201027225454.3492351-1-bigeasy@linutronix.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

The driver uses in_irq() to determine if the tlan_priv::lock has to be
acquired in tlan_mii_read_reg() and tlan_mii_write_reg().

The interrupt handler acquires the lock outside of these functions so the
in_irq() check is meant to prevent a lock recursion deadlock. But this
check is incorrect when interrupt force threading is enabled because then
the handler runs in thread context and in_irq() correctly returns false.

The usage of in_*() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
seperated or the context be conveyed in an argument passed by the caller,
which usually knows the context.

tlan_set_timer() has this conditional as well, but this function is only
invoked from task context or the timer callback itself. So it always has to
lock and the check can be removed.

tlan_mii_read_reg(), tlan_mii_write_reg() and tlan_phy_print() are invoked
from interrupt and other contexts.

Split out the actual function body into helper variants which are called
from interrupt context and make the original functions wrappers which
acquire tlan_priv::lock unconditionally.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Samuel Chessman <chessman@tux.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

nv_update_stats() triggers a WARN_ON() when invoked from hard interrupt
context because the locks in use are not hard interrupt safe. It also has
an assert_spin_locked() which was the lock check before the lockdep era.

Lockdep has way broader locking correctness checks and covers both issues,
so replace the warning and the lock assert with lockdep_assert_held().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Rain River <rain.1986.08.12@gmail.com>
Cc: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

wait_for_cmd_complete() uses in_interrupt() to detect whether it is safe to
sleep or not.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be seperated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

in_interrupt() also is only partially correct because it fails to chose the
correct code path when just preemption or interrupts are disabled.

Add an argument 'may_block' to both functions and adjust the callers to
pass the context information.

The following call chains which end up invoking wait_for_cmd_complete()
were analyzed to be safe to sleep:

 s2io_card_up()
   s2io_set_multicast()

 init_nic()
   init_tti()

 s2io_close()
   do_s2io_delete_unicast_mc()
     do_s2io_add_mac()

 s2io_set_mac_addr()
   do_s2io_prog_unicast()
     do_s2io_add_mac()

 s2io_reset()
   do_s2io_restore_unicast_mc()
     do_s2io_add_mc()
       do_s2io_add_mac()

 s2io_open()
   do_s2io_prog_unicast()
     do_s2io_add_mac()

The following call chains which end up invoking wait_for_cmd_complete()
were analyzed to be safe to sleep:

 __dev_set_rx_mode()
    s2io_set_multicast()

 s2io_txpic_intr_handle()
   s2io_link()
     init_tti()

Add a may_sleep argument to wait_for_cmd_complete(), s2io_set_multicast()
and init_tti() and hand the context information in from the call sites.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Vladimir Oltean says:

====================
L2 multicast forwarding for Ocelot switch

This series enables the mscc_ocelot switch to forward raw L2 (non-IP)
mdb entries as configured by the bridge driver after this patch:

https://patchwork.ozlabs.org/project/netdev/patch/20201028233831.610076-1-vladimir.oltean@nxp.com/
====================

Link: https://lore.kernel.org/r/20201029022738.722794-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

There is one main difference in mscc_ocelot between IP multicast and L2
multicast. With IP multicast, destination ports are encoded into the
upper bytes of the multicast MAC address. Example: to deliver the
address 01:00:5E:11:22:33 to ports 3, 8, and 9, one would need to
program the address of 00:03:08:11:22:33 into hardware. Whereas for L2
multicast, the MAC table entry points to a Port Group ID (PGID), and
that PGID contains the port mask that the packet will be forwarded to.
As to why it is this way, no clue. My guess is that not all port
combinations can be supported simultaneously with the limited number of
PGIDs, and this was somehow an issue for IP multicast but not for L2
multicast. Anyway.

Prior to this change, the raw L2 multicast code was bogus, due to the
fact that there wasn't really any way to test it using the bridge code.
There were 2 issues:
- A multicast PGID was allocated for each MDB entry, but it wasn't in
  fact programmed to hardware. It was dummy.
- In fact we don't want to reserve a multicast PGID for every single MDB
  entry. That would be odd because we can only have ~60 PGIDs, but
  thousands of MDB entries. So instead, we want to reserve a multicast
  PGID for every single port combination for multicast traffic. And
  since we can have 2 (or more) MDB entries delivered to the same port
  group (and therefore PGID), we need to reference-count the PGIDs.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This saves a re-classification of the MDB address on deletion.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

It is Not Needed, a comment will suffice.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Since a helper is available for copying Ethernet addresses, let's use it.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>