The tests themselves are the same as the ISA device ones.
Only the main() changes as the "tpm-tis-device" device gets
instantiated. Also the base address of the device is not
0xFED40000 anymore but matches the base address of the
ARM virt platform bus.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-id: 20200305165149.618-11-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

ISA and sysbus TPM-TIS devices will share their tests. Only
the main() will change (instantiation option is different).
Also the base address of the TPM-TIS device is going to be
different. on x86 it is located at 0xFED40000 while on ARM
it can be located at any location, discovered through the
device tree description.

So we put shared test functions in a new object module.
Each test needs to set tpm_tis_base_addr global variable.

Also take benefit of this move to fix "block comments using
a leading */ on a separate line" checkpatch warnings.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-id: 20200305165149.618-10-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

We plan to use swtpm test functions on ARM for testing the
sysbus TPM-TIS device. However on ARM there is no default machine
type. So we need to explictly pass some machine options on startup.
Let's allow this by adding a new parameter to both swtpm test
functions and update all call sites.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-id: 20200305165149.618-9-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

Update the documentation with recent changes related to the
sysbus TPM_TIS device addition and add the command line
to be used with arm VIRT.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-id: 20200305165149.618-8-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

Let the TPM TIS SYSBUS device be dynamically instantiable
in ARM virt.  A device tree node is dynamically created
(TPM via MMIO).

The TPM Physical Presence interface (PPI) is not supported.

To run with the swtmp TPM emulator, the qemu command line must
be augmented with:

        -chardev socket,id=chrtpm,path=swtpm-sock \
        -tpmdev emulator,id=tpm0,chardev=chrtpm \
        -device tpm-tis-device,tpmdev=tpm0 \

swtpm/libtpms command line example:

swtpm socket --tpm2 -t -d --tpmstate dir=/tmp/tpm \
--ctrl type=unixio,path=swtpm-sock

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 20200305165149.618-7-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

Introduce the tpm-tis-device which is a sysbus device
and is bound to be used on ARM.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 20200305165149.618-6-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

Let's separate the compilation of tpm_tis_common.c from
the compilation of tpm_tis_isa.c

The common part will be also compiled along with the
tpm_tis_sysbus device.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 20200305165149.618-5-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

Move the device agnostic code into tpm_tis_common.c and
put the ISA device specific code into tpm_tis_isa.c

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 20200305165149.618-4-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

As we plan to introduce a SysBus TPM TIS device, let's
make the TPMState a common struct usable by both the
ISADevice and the SysBusDevice. TPMStateISA embeds the
struct and inherits from the ISADevice.

The prototype of functions bound to be used by both
the ISA and SysBus devices is changed to take TPMState
handle.

A bunch of structs also are renamed to be specialized
for the ISA device. Besides those transformations, no
functional change is expected.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 20200305165149.618-3-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

As we plan to introduce a sysbus TPM_TIS, let's rename
TPM_TIS into TPM_TIS_ISA.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 20200305165149.618-2-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

QAPI patches for 2020-03-05

# gpg: Signature made Thu 05 Mar 2020 12:42:15 GMT
# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg:                issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-qapi-2020-03-05:
  qapi: Brush off some (py)lint
  qapi: Use super() now we have Python 3
  qapi: Drop conditionals for Python 2
  qapi: Inheriting from object is pointless with Python 3, drop

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Testing updates

  - some clean-ups for tests/vm
  - enable tools build for MacOSX
  - bump avocado to a newer version
  - bump travis env for avocado

# gpg: Signature made Wed 04 Mar 2020 10:00:19 GMT
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8  DF35 FBD0 DB09 5A9E 2A44

* remotes/stsquad/tags/pull-testing-040320-1:
  travis.yml: install python3 numpy and opencv libraries
  tests/acceptance: bump avocado requirements to 76.0
  configure: detect and report genisoimage
  travis: enable tools build on OS X
  tests/vm: Added gen_cloud_init_iso() to basevm.py
  tests/vm: give wait_ssh() option to wait for root
  tests/vm: increased max timeout for vm boot.
  tests/vm: Debug mode shows ssh output.
  tests/vm: use $(PYTHON) consistently

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200304155932.20452-5-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200304155932.20452-4-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200304155932.20452-3-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200304155932.20452-2-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>

These are used for the acceptance framebuffer tests to count Tux. As
we need slightly newer python3 for opencv we bump up to bionic.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Message-Id: <20200303150622.20133-10-alex.bennee@linaro.org>

If we want to use @skipUnless decorations on the class we need a
newer version of avocado.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200303150622.20133-9-alex.bennee@linaro.org>

This is used for some of the vm-build tests so lets detect it and
behave sanely when it is not installed.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200303150622.20133-8-alex.bennee@linaro.org>

As we can build tools on OS X we should check we don't break build
when we submit new codes.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200302154630.45620-3-lvivier@redhat.com>
Message-Id: <20200303150622.20133-7-alex.bennee@linaro.org>

This method was located in both centos and ubuntu.i386.

Signed-off-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Puhov <peter.puhov@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200219163537.22098-6-robert.foley@linaro.org>
Message-Id: <20200303150622.20133-6-alex.bennee@linaro.org>

Allow wait_ssh to wait for root user to be ready.
This solves the issue where we perform a wait_ssh()
successfully, but the root user is not yet ready
to be logged in.

Signed-off-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Puhov <peter.puhov@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200219163537.22098-5-robert.foley@linaro.org>
Message-Id: <20200303150622.20133-5-alex.bennee@linaro.org>

Add change to increase timeout waiting for VM to boot.
Needed for some emulation cases where it can take longer
than 5 minutes to boot.

Signed-off-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Puhov <peter.puhov@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200219163537.22098-4-robert.foley@linaro.org>
Message-Id: <20200303150622.20133-4-alex.bennee@linaro.org>

Add changes to tests/vm/basevm.py so that during debug mode we show ssh output.

Signed-off-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Peter Puhov <peter.puhov@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200219163537.22098-3-robert.foley@linaro.org>
Message-Id: <20200303150622.20133-3-alex.bennee@linaro.org>

Change Makefile.include to use $(PYTHON) so for vm-boot-ssh to be
consistent with other cases like vm-build.

Signed-off-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Puhov <peter.puhov@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200219163537.22098-2-robert.foley@linaro.org>
Message-Id: <20200303150622.20133-2-alex.bennee@linaro.org>

Virtiofsd pull 2020-03-03

xattr fixes from Misono.

# gpg: Signature made Tue 03 Mar 2020 15:15:04 GMT
# gpg:                using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert-gitlab/tags/pull-virtiofs-20200303:
  virtiofsd: Fix xattr operations
  virtiofsd: passthrough_ll: cleanup getxattr/listxattr

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Current virtiofsd has problems about xattr operations and
they does not work properly for directory/symlink/special file.

The fundamental cause is that virtiofsd uses openat() + f...xattr()
systemcalls for xattr operation but we should not open symlink/special
file in the daemon. Therefore the function is restricted.

Fix this problem by:
 1. during setup of each thread, call unshare(CLONE_FS)
 2. in xattr operations (i.e. lo_getxattr), if inode is not a regular
    file or directory, use fchdir(proc_loot_fd) + ...xattr() +
    fchdir(root.fd) instead of openat() + f...xattr()

    (Note: for a regular file/directory openat() + f...xattr()
     is still used for performance reason)

With this patch, xfstests generic/062 passes on virtiofs.

This fix is suggested by Miklos Szeredi and Stefan Hajnoczi.
The original discussion can be found here:
  https://www.redhat.com/archives/virtio-fs/2019-October/msg00046.html



Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Message-Id: <20200227055927.24566-3-misono.tomohiro@jp.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

This is a cleanup patch to simplify the following xattr fix and
there is no functional changes.

- Move memory allocation to head of the function
- Unify fgetxattr/flistxattr call for both size == 0 and
  size != 0 case
- Remove redundant lo_inode_put call in error path
  (Note: second call is ignored now since @inode is already NULL)

Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Message-Id: <20200227055927.24566-2-misono.tomohiro@jp.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

# gpg: Signature made Tue 03 Mar 2020 10:06:06 GMT
# gpg:                using RSA key EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 215D 46F4 8246 689E C77F  3562 EF04 965B 398D 6211

* remotes/jasowang/tags/net-pull-request: (23 commits)
  l2tpv3: fix RFC number typo in qemu-options.hx
  colo: Update Documentation for continuous replication
  net/filter.c: Add Options to insert filters anywhere in the filter list
  tests/test-replication.c: Add test for for secondary node continuing replication
  block/replication.c: Ignore requests after failover
  hw: net: cadence_gem: Fix build errors in DB_PRINT()
  NetRxPkt: fix hash calculation of IPV6 TCP
  NetRxPkt: Introduce support for additional hash types
  e1000e: Avoid hw_error if legacy mode used
  dp8393x: Don't stop reception upon RBE interrupt assertion
  dp8393x: Don't reset Silicon Revision register
  dp8393x: Always update RRA pointers and sequence numbers
  dp8393x: Clear descriptor in_use field to release packet
  dp8393x: Pad frames to word or long word boundary
  dp8393x: Use long-word-aligned RRA pointers in 32-bit mode
  dp8393x: Don't clobber packet checksum
  dp8393x: Implement packet size limit and RBAE interrupt
  dp8393x: Clear RRRA command register bit only when appropriate
  dp8393x: Update LLFA and CRDA registers from rx descriptor
  dp8393x: Have dp8393x_receive() return the packet size
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

RISC-V Patches for the 5.0 Soft Freeze, Part 3

This pull request is almost entirely an implementation of the draft hypervisor
extension.  This extension is still in draft and is expected to have
incompatible changes before being frozen, but we've had good luck managing
other RISC-V draft extensions in QEMU so far.

Additionally, there's a fix to PCI addressing and some improvements to the
M-mode timer.

This boots linux and passes make check for me.

# gpg: Signature made Tue 03 Mar 2020 00:23:20 GMT
# gpg:                using RSA key 2B3C3747446843B24A943A7A2E1319F35FBB1889
# gpg:                issuer "palmer@dabbelt.com"
# gpg: Good signature from "Palmer Dabbelt <palmer@dabbelt.com>" [unknown]
# gpg:                 aka "Palmer Dabbelt <palmer@sifive.com>" [unknown]
# gpg:                 aka "Palmer Dabbelt <palmerdabbelt@google.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 00CE 76D1 8349 60DF CE88  6DF8 EF4C A150 2CCB AB41
#      Subkey fingerprint: 2B3C 3747 4468 43B2 4A94  3A7A 2E13 19F3 5FBB 1889

* remotes/palmer/tags/riscv-for-master-5.0-sf3: (38 commits)
  hw/riscv: Provide rdtime callback for TCG in CLINT emulation
  target/riscv: Emulate TIME CSRs for privileged mode
  riscv: virt: Allow PCI address 0
  target/riscv: Allow enabling the Hypervisor extension
  target/riscv: Add the MSTATUS_MPV_ISSET helper macro
  target/riscv: Add support for the 32-bit MSTATUSH CSR
  target/riscv: Set htval and mtval2 on execptions
  target/riscv: Raise the new execptions when 2nd stage translation fails
  target/riscv: Implement second stage MMU
  target/riscv: Allow specifying MMU stage
  target/riscv: Respect MPRV and SPRV for floating point ops
  target/riscv: Mark both sstatus and msstatus_hs as dirty
  target/riscv: Disable guest FP support based on virtual status
  target/riscv: Only set TB flags with FP status if enabled
  target/riscv: Remove the hret instruction
  target/riscv: Add hfence instructions
  target/riscv: Add Hypervisor trap return support
  target/riscv: Add hypvervisor trap support
  target/riscv: Generate illegal instruction on WFI when V=1
  target/ricsv: Flush the TLB on virtulisation mode changes
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

The L2TPv3 RFC number is 3931:
https://tools.ietf.org/html/rfc3931



Reported-by: Henrik Johansson <henrikjohansson@rocketmail.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

Document the qemu command-line and qmp commands for continuous replication

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Signed-off-by: Jason Wang <jasowang@redhat.com>

To switch the Secondary to Primary, we need to insert new filters
before the filter-rewriter.

Add the options insert= and position= to be able to insert filters
anywhere in the filter list.

position should be "head" or "tail" to insert at the head or
tail of the filter list or it should be "id=<id>" to specify
the id of another filter.
insert should be either "before" or "behind" to specify where to
insert the new filter relative to the one specified with position.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Reviewed-by: Zhang Chen <chen.zhang@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

This simulates the case that happens when we resume COLO after failover.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Signed-off-by: Jason Wang <jasowang@redhat.com>

After failover the Secondary side of replication shouldn't change state, because
it now functions as our primary disk.

In replication_start, replication_do_checkpoint, replication_stop, ignore
the request if current state is BLOCK_REPLICATION_DONE (sucessful failover) or
BLOCK_REPLICATION_FAILOVER (failover in progres i.e. currently merging active
and hidden images into the base image).

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Reviewed-by: Zhang Chen <chen.zhang@intel.com>
Acked-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

When CADENCE_GEM_ERR_DEBUG is turned on, there are several
compilation errors in DB_PRINT(). Fix them.

While we are here, update to use appropriate modifiers in
the same DB_PRINT() call.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

When requested to calculate the hash for TCPV6 packet,
ignore overrides of source and destination addresses
in in extension headers.
Use these overrides when new hash type NetPktRssIpV6TcpEx
requested.
Use this type in e1000e hash calculation for IPv6 TCP, which
should take in account overrides of the addresses.

Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Acked-by: Dmitry Fleytman <dmitry.fleytman@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

Add support for following hash types:
IPV6 TCP with extension headers
IPV4 UDP
IPV6 UDP
IPV6 UDP with extension headers

Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Acked-by: Dmitry Fleytman <dmitry.fleytman@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

https://bugzilla.redhat.com/show_bug.cgi?id=1787142


The emulation issues hw_error if PSRCTL register
is written, for example, with zero value.
Such configuration does not present any problem when
DTYP bits of RCTL register define legacy format of
transfer descriptors. Current commit discards check
for BSIZE0 and BSIZE1 when legacy mode used.

Acked-by: Dmitry Fleytman <dmitry.fleytman@gmail.com>
Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

Section 3.4.7 of the datasheet explains that,

    The RBE bit in the Interrupt Status register is set when the
    SONIC finishes using the second to last receive buffer and reads
    the last RRA descriptor. Actually, the SONIC is not truly out of
    resources, but gives the system an early warning of an impending
    out of resources condition.

RBE does not mean actual receive buffer exhaustion, and reception should
not be stopped. This is important because Linux will not check and clear
the RBE interrupt until it receives another packet. But that won't
happen if can_receive returns false. This bug causes the SONIC to become
deaf (until reset).

Fix this with a new flag to indicate actual receive buffer exhaustion.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Jason Wang <jasowang@redhat.com>