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[RFC PATCH v3 0/6] eBPF RSS support for virtio-net

Andrew Melnychenko posted 6 patches 4 years, 8 months ago
Test checkpatch failed
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20210114211612.387052-1-andrew@daynix.com
Maintainers: Jason Wang <jasowang@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>
There is a newer version of this series
MAINTAINERS                    |   8 +
configure                      |  33 +++
docs/ebpf_rss.rst              | 125 ++++++++
ebpf/ebpf_rss-stub.c           |  40 +++
ebpf/ebpf_rss.c                | 165 +++++++++++
ebpf/ebpf_rss.h                |  44 +++
ebpf/meson.build               |   1 +
ebpf/rss.bpf.skeleton.h        | 397 ++++++++++++++++++++++++++
ebpf/trace-events              |   4 +
ebpf/trace.h                   |   2 +
hw/net/vhost_net.c             |   2 +
hw/net/virtio-net.c            | 125 +++++++-
include/hw/virtio/virtio-net.h |   4 +
include/net/net.h              |   2 +
meson.build                    |  13 +
net/tap-bsd.c                  |   5 +
net/tap-linux.c                |  13 +
net/tap-linux.h                |   1 +
net/tap-solaris.c              |   5 +
net/tap-stub.c                 |   5 +
net/tap.c                      |   9 +
net/tap_int.h                  |   1 +
net/vhost-vdpa.c               |   2 +
tools/ebpf/Makefile.ebpf       |  33 +++
tools/ebpf/rss.bpf.c           | 505 +++++++++++++++++++++++++++++++++
25 files changed, 1540 insertions(+), 4 deletions(-)
create mode 100644 docs/ebpf_rss.rst
create mode 100644 ebpf/ebpf_rss-stub.c
create mode 100644 ebpf/ebpf_rss.c
create mode 100644 ebpf/ebpf_rss.h
create mode 100644 ebpf/meson.build
create mode 100644 ebpf/rss.bpf.skeleton.h
create mode 100644 ebpf/trace-events
create mode 100644 ebpf/trace.h
create mode 100755 tools/ebpf/Makefile.ebpf
create mode 100644 tools/ebpf/rss.bpf.c
[RFC PATCH v3 0/6] eBPF RSS support for virtio-net
Posted by Andrew Melnychenko 4 years, 8 months ago 
This set of patches introduces the usage of eBPF for packet steering
and RSS hash calculation:
* RSS(Receive Side Scaling) is used to distribute network packets to
guest virtqueues by calculating packet hash
* Additionally adding support for the usage of RSS with vhost

The eBPF works on kernels 5.8+
On earlier kerneld it fails to load and the RSS feature is reported
only without vhost and implemented in 'in-qemu' software.

Implementation notes:
Linux TAP TUNSETSTEERINGEBPF ioctl was used to set the eBPF program.
Added libbpf dependency and eBPF support.
The eBPF program is part of the qemu and presented as an array
of BPF ELF file data. The eBPF array file initially generated by bpftool.
The compilation of eBPF is not part of QEMU build and can be done
using provided Makefile.ebpf(need to adjust 'linuxhdrs').
Added changes to virtio-net and vhost, primary eBPF RSS is used.
'in-qemu' RSS used in the case of hash population and as a fallback option.
For vhost, the hash population feature is not reported to the guest.

Please also see the documentation in PATCH 6/6.

I am sending those patches as RFC to initiate the discussions and get
feedback on the following points:
* Fallback when eBPF is not supported by the kernel
* Live migration to the kernel that doesn't have eBPF support
* Integration with current QEMU build
* Additional usage for eBPF for packet filtering

Known issues:
* hash population not supported by eBPF RSS: 'in-qemu' RSS used
as a fallback, also, hash population feature is not reported to guests
with vhost.

Changes since v1:
* using libbpf instead of direct 'bpf' system call.
* added libbpf dependency to the configure/meson scripts.
* changed python script for eBPF .h file generation.
* changed eBPF program - reading L3 proto from ethernet frame.
* added TUNSETSTEERINGEBPF define for TUN.
* changed the maintainer's info.
* added license headers.
* refactored code.Changes since v1:
* using libbpf instead of direct 'bpf' system call.
* added libbpf dependency to the configure/meson scripts.
* changed python script for eBPF .h file generation.
* changed eBPF program - reading L3 proto from ethernet frame.
* added TUNSETSTEERINGEBPF define for TUN.
* changed the maintainer's info.
* added license headers.
* refactored code.

Changes since v2:
* using bpftool for eBPF skeleton generation.
* ebpf_rss is refactored to use skeleton generated by bpftool.
* added/adjasted license in comment sections and in eBPF file.
* rss.bpf.c and Makefile.ebpf moved to the tool/ebpf folder.
* virtio-net eBPF rss refactored. Now eBPF initialized during realize().

Andrew (6):
  net/tap: Added TUNSETSTEERINGEBPF code.
  net: Added SetSteeringEBPF method for NetClientState.
  ebpf: Added eBPF RSS program.
  ebpf: Added eBPF RSS loader.
  virtio-net: Added eBPF RSS to virtio-net.
  docs: Added eBPF documentation.

 MAINTAINERS                    |   8 +
 configure                      |  33 +++
 docs/ebpf_rss.rst              | 125 ++++++++
 ebpf/ebpf_rss-stub.c           |  40 +++
 ebpf/ebpf_rss.c                | 165 +++++++++++
 ebpf/ebpf_rss.h                |  44 +++
 ebpf/meson.build               |   1 +
 ebpf/rss.bpf.skeleton.h        | 397 ++++++++++++++++++++++++++
 ebpf/trace-events              |   4 +
 ebpf/trace.h                   |   2 +
 hw/net/vhost_net.c             |   2 +
 hw/net/virtio-net.c            | 125 +++++++-
 include/hw/virtio/virtio-net.h |   4 +
 include/net/net.h              |   2 +
 meson.build                    |  13 +
 net/tap-bsd.c                  |   5 +
 net/tap-linux.c                |  13 +
 net/tap-linux.h                |   1 +
 net/tap-solaris.c              |   5 +
 net/tap-stub.c                 |   5 +
 net/tap.c                      |   9 +
 net/tap_int.h                  |   1 +
 net/vhost-vdpa.c               |   2 +
 tools/ebpf/Makefile.ebpf       |  33 +++
 tools/ebpf/rss.bpf.c           | 505 +++++++++++++++++++++++++++++++++
 25 files changed, 1540 insertions(+), 4 deletions(-)
 create mode 100644 docs/ebpf_rss.rst
 create mode 100644 ebpf/ebpf_rss-stub.c
 create mode 100644 ebpf/ebpf_rss.c
 create mode 100644 ebpf/ebpf_rss.h
 create mode 100644 ebpf/meson.build
 create mode 100644 ebpf/rss.bpf.skeleton.h
 create mode 100644 ebpf/trace-events
 create mode 100644 ebpf/trace.h
 create mode 100755 tools/ebpf/Makefile.ebpf
 create mode 100644 tools/ebpf/rss.bpf.c

-- 
2.30.0
Re: [RFC PATCH v3 0/6] eBPF RSS support for virtio-net
Posted by Jason Wang 4 years, 8 months ago 
On 2021/1/15 上午5:16, Andrew Melnychenko wrote:
> This set of patches introduces the usage of eBPF for packet steering
> and RSS hash calculation:
> * RSS(Receive Side Scaling) is used to distribute network packets to
> guest virtqueues by calculating packet hash
> * Additionally adding support for the usage of RSS with vhost
>
> The eBPF works on kernels 5.8+
> On earlier kerneld it fails to load and the RSS feature is reported
> only without vhost and implemented in 'in-qemu' software.
>
> Implementation notes:
> Linux TAP TUNSETSTEERINGEBPF ioctl was used to set the eBPF program.
> Added libbpf dependency and eBPF support.
> The eBPF program is part of the qemu and presented as an array
> of BPF ELF file data. The eBPF array file initially generated by bpftool.
> The compilation of eBPF is not part of QEMU build and can be done
> using provided Makefile.ebpf(need to adjust 'linuxhdrs').
> Added changes to virtio-net and vhost, primary eBPF RSS is used.
> 'in-qemu' RSS used in the case of hash population and as a fallback option.
> For vhost, the hash population feature is not reported to the guest.
>
> Please also see the documentation in PATCH 6/6.
>
> I am sending those patches as RFC to initiate the discussions and get
> feedback on the following points:
> * Fallback when eBPF is not supported by the kernel
> * Live migration to the kernel that doesn't have eBPF support
> * Integration with current QEMU build
> * Additional usage for eBPF for packet filtering
>
> Known issues:
> * hash population not supported by eBPF RSS: 'in-qemu' RSS used
> as a fallback, also, hash population feature is not reported to guests
> with vhost.


Looks good overall. I think a formal series could be posted for the next 
version.

Please see comments in the patch and I think we need to add a migration 
blocker if RSS is supported by virtio-net. (And implement migration in 
the future).

Thanks


>
> Changes since v1:
> * using libbpf instead of direct 'bpf' system call.
> * added libbpf dependency to the configure/meson scripts.
> * changed python script for eBPF .h file generation.
> * changed eBPF program - reading L3 proto from ethernet frame.
> * added TUNSETSTEERINGEBPF define for TUN.
> * changed the maintainer's info.
> * added license headers.
> * refactored code.Changes since v1:
> * using libbpf instead of direct 'bpf' system call.
> * added libbpf dependency to the configure/meson scripts.
> * changed python script for eBPF .h file generation.
> * changed eBPF program - reading L3 proto from ethernet frame.
> * added TUNSETSTEERINGEBPF define for TUN.
> * changed the maintainer's info.
> * added license headers.
> * refactored code.
>
> Changes since v2:
> * using bpftool for eBPF skeleton generation.
> * ebpf_rss is refactored to use skeleton generated by bpftool.
> * added/adjasted license in comment sections and in eBPF file.
> * rss.bpf.c and Makefile.ebpf moved to the tool/ebpf folder.
> * virtio-net eBPF rss refactored. Now eBPF initialized during realize().
>
> Andrew (6):
>    net/tap: Added TUNSETSTEERINGEBPF code.
>    net: Added SetSteeringEBPF method for NetClientState.
>    ebpf: Added eBPF RSS program.
>    ebpf: Added eBPF RSS loader.
>    virtio-net: Added eBPF RSS to virtio-net.
>    docs: Added eBPF documentation.
>
>   MAINTAINERS                    |   8 +
>   configure                      |  33 +++
>   docs/ebpf_rss.rst              | 125 ++++++++
>   ebpf/ebpf_rss-stub.c           |  40 +++
>   ebpf/ebpf_rss.c                | 165 +++++++++++
>   ebpf/ebpf_rss.h                |  44 +++
>   ebpf/meson.build               |   1 +
>   ebpf/rss.bpf.skeleton.h        | 397 ++++++++++++++++++++++++++
>   ebpf/trace-events              |   4 +
>   ebpf/trace.h                   |   2 +
>   hw/net/vhost_net.c             |   2 +
>   hw/net/virtio-net.c            | 125 +++++++-
>   include/hw/virtio/virtio-net.h |   4 +
>   include/net/net.h              |   2 +
>   meson.build                    |  13 +
>   net/tap-bsd.c                  |   5 +
>   net/tap-linux.c                |  13 +
>   net/tap-linux.h                |   1 +
>   net/tap-solaris.c              |   5 +
>   net/tap-stub.c                 |   5 +
>   net/tap.c                      |   9 +
>   net/tap_int.h                  |   1 +
>   net/vhost-vdpa.c               |   2 +
>   tools/ebpf/Makefile.ebpf       |  33 +++
>   tools/ebpf/rss.bpf.c           | 505 +++++++++++++++++++++++++++++++++
>   25 files changed, 1540 insertions(+), 4 deletions(-)
>   create mode 100644 docs/ebpf_rss.rst
>   create mode 100644 ebpf/ebpf_rss-stub.c
>   create mode 100644 ebpf/ebpf_rss.c
>   create mode 100644 ebpf/ebpf_rss.h
>   create mode 100644 ebpf/meson.build
>   create mode 100644 ebpf/rss.bpf.skeleton.h
>   create mode 100644 ebpf/trace-events
>   create mode 100644 ebpf/trace.h
>   create mode 100755 tools/ebpf/Makefile.ebpf
>   create mode 100644 tools/ebpf/rss.bpf.c
>
Re: [RFC PATCH v3 0/6] eBPF RSS support for virtio-net
Posted by no-reply@patchew.org 4 years, 8 months ago 
Patchew URL: https://patchew.org/QEMU/20210114211612.387052-1-andrew@daynix.com/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Type: series
Message-id: 20210114211612.387052-1-andrew@daynix.com
Subject: [RFC PATCH v3 0/6] eBPF RSS support for virtio-net

=== TEST SCRIPT BEGIN ===
#!/bin/bash
git rev-parse base > /dev/null || exit 0
git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram
./scripts/checkpatch.pl --mailback base..
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
 - [tag update]      patchew/20210109143637.29645-1-bmeng.cn@gmail.com -> patchew/20210109143637.29645-1-bmeng.cn@gmail.com
 - [tag update]      patchew/20210112164045.98565-1-thuth@redhat.com -> patchew/20210112164045.98565-1-thuth@redhat.com
 - [tag update]      patchew/20210114165730.31607-1-alex.bennee@linaro.org -> patchew/20210114165730.31607-1-alex.bennee@linaro.org
 - [tag update]      patchew/20210114170304.87507-1-mreitz@redhat.com -> patchew/20210114170304.87507-1-mreitz@redhat.com
 - [tag update]      patchew/20210114174509.2944817-1-philmd@redhat.com -> patchew/20210114174509.2944817-1-philmd@redhat.com
 * [new tag]         patchew/20210114211612.387052-1-andrew@daynix.com -> patchew/20210114211612.387052-1-andrew@daynix.com
Switched to a new branch 'test'
32a7d31 docs: Added eBPF documentation.
5829b35 virtio-net: Added eBPF RSS to virtio-net.
c1e16f7 ebpf: Added eBPF RSS loader.
67e8d5f ebpf: Added eBPF RSS program.
9955cbd net: Added SetSteeringEBPF method for NetClientState.
7255813 net/tap: Added TUNSETSTEERINGEBPF code.

=== OUTPUT BEGIN ===
1/6 Checking commit 725581347a66 (net/tap: Added TUNSETSTEERINGEBPF code.)
2/6 Checking commit 9955cbd7e95d (net: Added SetSteeringEBPF method for NetClientState.)
3/6 Checking commit 67e8d5f1220d (ebpf: Added eBPF RSS program.)
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#18: 
new file mode 100755

WARNING: line over 80 characters
#216: FILE: tools/ebpf/rss.bpf.c:155:
+ * According to https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml

WARNING: line over 80 characters
#219: FILE: tools/ebpf/rss.bpf.c:158:
+ * Need to choose reasonable amount of maximum extensions/options we may check to find

WARNING: line over 80 characters
#279: FILE: tools/ebpf/rss.bpf.c:218:
+                        *l4_offset + opt_offset + offsetof(struct ipv6_destopt_hao, addr),

total: 0 errors, 4 warnings, 538 lines checked

Patch 3/6 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
4/6 Checking commit c1e16f784c92 (ebpf: Added eBPF RSS loader.)
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#91: 
new file mode 100644

WARNING: architecture specific defines should be avoided
#373: FILE: ebpf/rss.bpf.skeleton.h:4:
+#ifndef __RSS_BPF_SKEL_H__

ERROR: code indent should never use tabs
#380: FILE: ebpf/rss.bpf.skeleton.h:11:
+^Istruct bpf_object_skeleton *skeleton;$

ERROR: code indent should never use tabs
#381: FILE: ebpf/rss.bpf.skeleton.h:12:
+^Istruct bpf_object *obj;$

ERROR: code indent should never use tabs
#382: FILE: ebpf/rss.bpf.skeleton.h:13:
+^Istruct {$

ERROR: code indent should never use tabs
#383: FILE: ebpf/rss.bpf.skeleton.h:14:
+^I^Istruct bpf_map *tap_rss_map_configurations;$

ERROR: code indent should never use tabs
#384: FILE: ebpf/rss.bpf.skeleton.h:15:
+^I^Istruct bpf_map *tap_rss_map_indirection_table;$

ERROR: code indent should never use tabs
#385: FILE: ebpf/rss.bpf.skeleton.h:16:
+^I^Istruct bpf_map *tap_rss_map_toeplitz_key;$

ERROR: code indent should never use tabs
#386: FILE: ebpf/rss.bpf.skeleton.h:17:
+^I} maps;$

ERROR: code indent should never use tabs
#387: FILE: ebpf/rss.bpf.skeleton.h:18:
+^Istruct {$

ERROR: code indent should never use tabs
#388: FILE: ebpf/rss.bpf.skeleton.h:19:
+^I^Istruct bpf_program *tun_rss_steering_prog;$

ERROR: code indent should never use tabs
#389: FILE: ebpf/rss.bpf.skeleton.h:20:
+^I} progs;$

ERROR: code indent should never use tabs
#390: FILE: ebpf/rss.bpf.skeleton.h:21:
+^Istruct {$

ERROR: code indent should never use tabs
#391: FILE: ebpf/rss.bpf.skeleton.h:22:
+^I^Istruct bpf_link *tun_rss_steering_prog;$

ERROR: code indent should never use tabs
#392: FILE: ebpf/rss.bpf.skeleton.h:23:
+^I} links;$

ERROR: code indent should never use tabs
#398: FILE: ebpf/rss.bpf.skeleton.h:29:
+^Iif (!obj)$

ERROR: braces {} are necessary for all arms of this statement
#398: FILE: ebpf/rss.bpf.skeleton.h:29:
+       if (!obj)
[...]

ERROR: code indent should never use tabs
#399: FILE: ebpf/rss.bpf.skeleton.h:30:
+^I^Ireturn;$

ERROR: code indent should never use tabs
#400: FILE: ebpf/rss.bpf.skeleton.h:31:
+^Iif (obj->skeleton)$

ERROR: braces {} are necessary for all arms of this statement
#400: FILE: ebpf/rss.bpf.skeleton.h:31:
+       if (obj->skeleton)
[...]

ERROR: code indent should never use tabs
#401: FILE: ebpf/rss.bpf.skeleton.h:32:
+^I^Ibpf_object__destroy_skeleton(obj->skeleton);$

ERROR: code indent should never use tabs
#402: FILE: ebpf/rss.bpf.skeleton.h:33:
+^Ifree(obj);$

ERROR: code indent should never use tabs
#411: FILE: ebpf/rss.bpf.skeleton.h:42:
+^Istruct rss_bpf *obj;$

ERROR: code indent should never use tabs
#413: FILE: ebpf/rss.bpf.skeleton.h:44:
+^Iobj = (struct rss_bpf *)calloc(1, sizeof(*obj));$

ERROR: code indent should never use tabs
#414: FILE: ebpf/rss.bpf.skeleton.h:45:
+^Iif (!obj)$

ERROR: braces {} are necessary for all arms of this statement
#414: FILE: ebpf/rss.bpf.skeleton.h:45:
+       if (!obj)
[...]

ERROR: code indent should never use tabs
#415: FILE: ebpf/rss.bpf.skeleton.h:46:
+^I^Ireturn NULL;$

ERROR: code indent should never use tabs
#416: FILE: ebpf/rss.bpf.skeleton.h:47:
+^Iif (rss_bpf__create_skeleton(obj))$

ERROR: braces {} are necessary for all arms of this statement
#416: FILE: ebpf/rss.bpf.skeleton.h:47:
+       if (rss_bpf__create_skeleton(obj))
[...]

ERROR: code indent should never use tabs
#417: FILE: ebpf/rss.bpf.skeleton.h:48:
+^I^Igoto err;$

ERROR: code indent should never use tabs
#418: FILE: ebpf/rss.bpf.skeleton.h:49:
+^Iif (bpf_object__open_skeleton(obj->skeleton, opts))$

ERROR: braces {} are necessary for all arms of this statement
#418: FILE: ebpf/rss.bpf.skeleton.h:49:
+       if (bpf_object__open_skeleton(obj->skeleton, opts))
[...]

ERROR: code indent should never use tabs
#419: FILE: ebpf/rss.bpf.skeleton.h:50:
+^I^Igoto err;$

ERROR: code indent should never use tabs
#421: FILE: ebpf/rss.bpf.skeleton.h:52:
+^Ireturn obj;$

ERROR: code indent should never use tabs
#423: FILE: ebpf/rss.bpf.skeleton.h:54:
+^Irss_bpf__destroy(obj);$

ERROR: code indent should never use tabs
#424: FILE: ebpf/rss.bpf.skeleton.h:55:
+^Ireturn NULL;$

ERROR: code indent should never use tabs
#430: FILE: ebpf/rss.bpf.skeleton.h:61:
+^Ireturn rss_bpf__open_opts(NULL);$

ERROR: code indent should never use tabs
#436: FILE: ebpf/rss.bpf.skeleton.h:67:
+^Ireturn bpf_object__load_skeleton(obj->skeleton);$

ERROR: code indent should never use tabs
#442: FILE: ebpf/rss.bpf.skeleton.h:73:
+^Istruct rss_bpf *obj;$

ERROR: code indent should never use tabs
#444: FILE: ebpf/rss.bpf.skeleton.h:75:
+^Iobj = rss_bpf__open();$

ERROR: code indent should never use tabs
#445: FILE: ebpf/rss.bpf.skeleton.h:76:
+^Iif (!obj)$

ERROR: braces {} are necessary for all arms of this statement
#445: FILE: ebpf/rss.bpf.skeleton.h:76:
+       if (!obj)
[...]

ERROR: code indent should never use tabs
#446: FILE: ebpf/rss.bpf.skeleton.h:77:
+^I^Ireturn NULL;$

ERROR: code indent should never use tabs
#447: FILE: ebpf/rss.bpf.skeleton.h:78:
+^Iif (rss_bpf__load(obj)) {$

ERROR: code indent should never use tabs
#448: FILE: ebpf/rss.bpf.skeleton.h:79:
+^I^Irss_bpf__destroy(obj);$

ERROR: code indent should never use tabs
#449: FILE: ebpf/rss.bpf.skeleton.h:80:
+^I^Ireturn NULL;$

ERROR: code indent should never use tabs
#450: FILE: ebpf/rss.bpf.skeleton.h:81:
+^I}$

ERROR: code indent should never use tabs
#451: FILE: ebpf/rss.bpf.skeleton.h:82:
+^Ireturn obj;$

ERROR: code indent should never use tabs
#457: FILE: ebpf/rss.bpf.skeleton.h:88:
+^Ireturn bpf_object__attach_skeleton(obj->skeleton);$

ERROR: code indent should never use tabs
#463: FILE: ebpf/rss.bpf.skeleton.h:94:
+^Ireturn bpf_object__detach_skeleton(obj->skeleton);$

ERROR: code indent should never use tabs
#469: FILE: ebpf/rss.bpf.skeleton.h:100:
+^Istruct bpf_object_skeleton *s;$

ERROR: code indent should never use tabs
#471: FILE: ebpf/rss.bpf.skeleton.h:102:
+^Is = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));$

ERROR: code indent should never use tabs
#472: FILE: ebpf/rss.bpf.skeleton.h:103:
+^Iif (!s)$

ERROR: braces {} are necessary for all arms of this statement
#472: FILE: ebpf/rss.bpf.skeleton.h:103:
+       if (!s)
[...]

ERROR: code indent should never use tabs
#473: FILE: ebpf/rss.bpf.skeleton.h:104:
+^I^Ireturn -1;$

ERROR: code indent should never use tabs
#474: FILE: ebpf/rss.bpf.skeleton.h:105:
+^Iobj->skeleton = s;$

ERROR: code indent should never use tabs
#476: FILE: ebpf/rss.bpf.skeleton.h:107:
+^Is->sz = sizeof(*s);$

ERROR: code indent should never use tabs
#477: FILE: ebpf/rss.bpf.skeleton.h:108:
+^Is->name = "rss_bpf";$

ERROR: code indent should never use tabs
#478: FILE: ebpf/rss.bpf.skeleton.h:109:
+^Is->obj = &obj->obj;$

ERROR: code indent should never use tabs
#480: FILE: ebpf/rss.bpf.skeleton.h:111:
+^I/* maps */$

ERROR: code indent should never use tabs
#481: FILE: ebpf/rss.bpf.skeleton.h:112:
+^Is->map_cnt = 3;$

ERROR: code indent should never use tabs
#482: FILE: ebpf/rss.bpf.skeleton.h:113:
+^Is->map_skel_sz = sizeof(*s->maps);$

ERROR: code indent should never use tabs
#483: FILE: ebpf/rss.bpf.skeleton.h:114:
+^Is->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz);$

ERROR: code indent should never use tabs
#484: FILE: ebpf/rss.bpf.skeleton.h:115:
+^Iif (!s->maps)$

ERROR: braces {} are necessary for all arms of this statement
#484: FILE: ebpf/rss.bpf.skeleton.h:115:
+       if (!s->maps)
[...]

ERROR: code indent should never use tabs
#485: FILE: ebpf/rss.bpf.skeleton.h:116:
+^I^Igoto err;$

ERROR: code indent should never use tabs
#487: FILE: ebpf/rss.bpf.skeleton.h:118:
+^Is->maps[0].name = "tap_rss_map_configurations";$

ERROR: code indent should never use tabs
#488: FILE: ebpf/rss.bpf.skeleton.h:119:
+^Is->maps[0].map = &obj->maps.tap_rss_map_configurations;$

ERROR: code indent should never use tabs
#490: FILE: ebpf/rss.bpf.skeleton.h:121:
+^Is->maps[1].name = "tap_rss_map_indirection_table";$

ERROR: code indent should never use tabs
#491: FILE: ebpf/rss.bpf.skeleton.h:122:
+^Is->maps[1].map = &obj->maps.tap_rss_map_indirection_table;$

ERROR: code indent should never use tabs
#493: FILE: ebpf/rss.bpf.skeleton.h:124:
+^Is->maps[2].name = "tap_rss_map_toeplitz_key";$

ERROR: code indent should never use tabs
#494: FILE: ebpf/rss.bpf.skeleton.h:125:
+^Is->maps[2].map = &obj->maps.tap_rss_map_toeplitz_key;$

ERROR: code indent should never use tabs
#496: FILE: ebpf/rss.bpf.skeleton.h:127:
+^I/* programs */$

ERROR: code indent should never use tabs
#497: FILE: ebpf/rss.bpf.skeleton.h:128:
+^Is->prog_cnt = 1;$

ERROR: code indent should never use tabs
#498: FILE: ebpf/rss.bpf.skeleton.h:129:
+^Is->prog_skel_sz = sizeof(*s->progs);$

WARNING: line over 80 characters
#499: FILE: ebpf/rss.bpf.skeleton.h:130:
+       s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);

ERROR: code indent should never use tabs
#499: FILE: ebpf/rss.bpf.skeleton.h:130:
+^Is->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);$

ERROR: code indent should never use tabs
#500: FILE: ebpf/rss.bpf.skeleton.h:131:
+^Iif (!s->progs)$

ERROR: braces {} are necessary for all arms of this statement
#500: FILE: ebpf/rss.bpf.skeleton.h:131:
+       if (!s->progs)
[...]

ERROR: code indent should never use tabs
#501: FILE: ebpf/rss.bpf.skeleton.h:132:
+^I^Igoto err;$

ERROR: code indent should never use tabs
#503: FILE: ebpf/rss.bpf.skeleton.h:134:
+^Is->progs[0].name = "tun_rss_steering_prog";$

ERROR: code indent should never use tabs
#504: FILE: ebpf/rss.bpf.skeleton.h:135:
+^Is->progs[0].prog = &obj->progs.tun_rss_steering_prog;$

ERROR: code indent should never use tabs
#505: FILE: ebpf/rss.bpf.skeleton.h:136:
+^Is->progs[0].link = &obj->links.tun_rss_steering_prog;$

ERROR: code indent should never use tabs
#507: FILE: ebpf/rss.bpf.skeleton.h:138:
+^Is->data_sz = 7088;$

ERROR: code indent should never use tabs
#508: FILE: ebpf/rss.bpf.skeleton.h:139:
+^Is->data = (void *)"\$

ERROR: code indent should never use tabs
#760: FILE: ebpf/rss.bpf.skeleton.h:391:
+^Ireturn 0;$

ERROR: code indent should never use tabs
#762: FILE: ebpf/rss.bpf.skeleton.h:393:
+^Ibpf_object__destroy_skeleton(s);$

ERROR: code indent should never use tabs
#763: FILE: ebpf/rss.bpf.skeleton.h:394:
+^Ireturn -1;$

total: 85 errors, 3 warnings, 756 lines checked

Patch 4/6 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

5/6 Checking commit 5829b35f89fc (virtio-net: Added eBPF RSS to virtio-net.)
WARNING: line over 80 characters
#192: FILE: hw/net/virtio-net.c:2868:
+                    warn_report("Can't post-load eBPF RSS - fallback to software RSS");

total: 0 errors, 1 warnings, 223 lines checked

Patch 5/6 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
6/6 Checking commit 32a7d313e818 (docs: Added eBPF documentation.)
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#33: 
new file mode 100644

total: 0 errors, 1 warnings, 139 lines checked

Patch 6/6 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/20210114211612.387052-1-andrew@daynix.com/testing.checkpatch/?type=message.
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