<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux-stable.git/Documentation/bpf, branch v5.3</title>
<subtitle>Linux kernel stable tree</subtitle>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/'/>
<entry>
<title>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next</title>
<updated>2019-07-11T17:55:49+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2019-07-11T17:55:49+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=237f83dfbe668443b5e31c3c7576125871cca674'/>
<id>237f83dfbe668443b5e31c3c7576125871cca674</id>
<content type='text'>
Pull networking updates from David Miller:
 "Some highlights from this development cycle:

   1) Big refactoring of ipv6 route and neigh handling to support
      nexthop objects configurable as units from userspace. From David
      Ahern.

   2) Convert explored_states in BPF verifier into a hash table,
      significantly decreased state held for programs with bpf2bpf
      calls, from Alexei Starovoitov.

   3) Implement bpf_send_signal() helper, from Yonghong Song.

   4) Various classifier enhancements to mvpp2 driver, from Maxime
      Chevallier.

   5) Add aRFS support to hns3 driver, from Jian Shen.

   6) Fix use after free in inet frags by allocating fqdirs dynamically
      and reworking how rhashtable dismantle occurs, from Eric Dumazet.

   7) Add act_ctinfo packet classifier action, from Kevin
      Darbyshire-Bryant.

   8) Add TFO key backup infrastructure, from Jason Baron.

   9) Remove several old and unused ISDN drivers, from Arnd Bergmann.

  10) Add devlink notifications for flash update status to mlxsw driver,
      from Jiri Pirko.

  11) Lots of kTLS offload infrastructure fixes, from Jakub Kicinski.

  12) Add support for mv88e6250 DSA chips, from Rasmus Villemoes.

  13) Various enhancements to ipv6 flow label handling, from Eric
      Dumazet and Willem de Bruijn.

  14) Support TLS offload in nfp driver, from Jakub Kicinski, Dirk van
      der Merwe, and others.

  15) Various improvements to axienet driver including converting it to
      phylink, from Robert Hancock.

  16) Add PTP support to sja1105 DSA driver, from Vladimir Oltean.

  17) Add mqprio qdisc offload support to dpaa2-eth, from Ioana
      Radulescu.

  18) Add devlink health reporting to mlx5, from Moshe Shemesh.

  19) Convert stmmac over to phylink, from Jose Abreu.

  20) Add PTP PHC (Physical Hardware Clock) support to mlxsw, from
      Shalom Toledo.

  21) Add nftables SYNPROXY support, from Fernando Fernandez Mancera.

  22) Convert tcp_fastopen over to use SipHash, from Ard Biesheuvel.

  23) Track spill/fill of constants in BPF verifier, from Alexei
      Starovoitov.

  24) Support bounded loops in BPF, from Alexei Starovoitov.

  25) Various page_pool API fixes and improvements, from Jesper Dangaard
      Brouer.

  26) Just like ipv4, support ref-countless ipv6 route handling. From
      Wei Wang.

  27) Support VLAN offloading in aquantia driver, from Igor Russkikh.

  28) Add AF_XDP zero-copy support to mlx5, from Maxim Mikityanskiy.

  29) Add flower GRE encap/decap support to nfp driver, from Pieter
      Jansen van Vuuren.

  30) Protect against stack overflow when using act_mirred, from John
      Hurley.

  31) Allow devmap map lookups from eBPF, from Toke Høiland-Jørgensen.

  32) Use page_pool API in netsec driver, Ilias Apalodimas.

  33) Add Google gve network driver, from Catherine Sullivan.

  34) More indirect call avoidance, from Paolo Abeni.

  35) Add kTLS TX HW offload support to mlx5, from Tariq Toukan.

  36) Add XDP_REDIRECT support to bnxt_en, from Andy Gospodarek.

  37) Add MPLS manipulation actions to TC, from John Hurley.

  38) Add sending a packet to connection tracking from TC actions, and
      then allow flower classifier matching on conntrack state. From
      Paul Blakey.

  39) Netfilter hw offload support, from Pablo Neira Ayuso"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (2080 commits)
  net/mlx5e: Return in default case statement in tx_post_resync_params
  mlx5: Return -EINVAL when WARN_ON_ONCE triggers in mlx5e_tls_resync().
  net: dsa: add support for BRIDGE_MROUTER attribute
  pkt_sched: Include const.h
  net: netsec: remove static declaration for netsec_set_tx_de()
  net: netsec: remove superfluous if statement
  netfilter: nf_tables: add hardware offload support
  net: flow_offload: rename tc_cls_flower_offload to flow_cls_offload
  net: flow_offload: add flow_block_cb_is_busy() and use it
  net: sched: remove tcf block API
  drivers: net: use flow block API
  net: sched: use flow block API
  net: flow_offload: add flow_block_cb_{priv, incref, decref}()
  net: flow_offload: add list handling functions
  net: flow_offload: add flow_block_cb_alloc() and flow_block_cb_free()
  net: flow_offload: rename TCF_BLOCK_BINDER_TYPE_* to FLOW_BLOCK_BINDER_TYPE_*
  net: flow_offload: rename TC_BLOCK_{UN}BIND to FLOW_BLOCK_{UN}BIND
  net: flow_offload: add flow_block_cb_setup_simple()
  net: hisilicon: Add an tx_desc to adapt HI13X1_GMAC
  net: hisilicon: Add an rx_desc to adapt HI13X1_GMAC
  ...
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull networking updates from David Miller:
 "Some highlights from this development cycle:

   1) Big refactoring of ipv6 route and neigh handling to support
      nexthop objects configurable as units from userspace. From David
      Ahern.

   2) Convert explored_states in BPF verifier into a hash table,
      significantly decreased state held for programs with bpf2bpf
      calls, from Alexei Starovoitov.

   3) Implement bpf_send_signal() helper, from Yonghong Song.

   4) Various classifier enhancements to mvpp2 driver, from Maxime
      Chevallier.

   5) Add aRFS support to hns3 driver, from Jian Shen.

   6) Fix use after free in inet frags by allocating fqdirs dynamically
      and reworking how rhashtable dismantle occurs, from Eric Dumazet.

   7) Add act_ctinfo packet classifier action, from Kevin
      Darbyshire-Bryant.

   8) Add TFO key backup infrastructure, from Jason Baron.

   9) Remove several old and unused ISDN drivers, from Arnd Bergmann.

  10) Add devlink notifications for flash update status to mlxsw driver,
      from Jiri Pirko.

  11) Lots of kTLS offload infrastructure fixes, from Jakub Kicinski.

  12) Add support for mv88e6250 DSA chips, from Rasmus Villemoes.

  13) Various enhancements to ipv6 flow label handling, from Eric
      Dumazet and Willem de Bruijn.

  14) Support TLS offload in nfp driver, from Jakub Kicinski, Dirk van
      der Merwe, and others.

  15) Various improvements to axienet driver including converting it to
      phylink, from Robert Hancock.

  16) Add PTP support to sja1105 DSA driver, from Vladimir Oltean.

  17) Add mqprio qdisc offload support to dpaa2-eth, from Ioana
      Radulescu.

  18) Add devlink health reporting to mlx5, from Moshe Shemesh.

  19) Convert stmmac over to phylink, from Jose Abreu.

  20) Add PTP PHC (Physical Hardware Clock) support to mlxsw, from
      Shalom Toledo.

  21) Add nftables SYNPROXY support, from Fernando Fernandez Mancera.

  22) Convert tcp_fastopen over to use SipHash, from Ard Biesheuvel.

  23) Track spill/fill of constants in BPF verifier, from Alexei
      Starovoitov.

  24) Support bounded loops in BPF, from Alexei Starovoitov.

  25) Various page_pool API fixes and improvements, from Jesper Dangaard
      Brouer.

  26) Just like ipv4, support ref-countless ipv6 route handling. From
      Wei Wang.

  27) Support VLAN offloading in aquantia driver, from Igor Russkikh.

  28) Add AF_XDP zero-copy support to mlx5, from Maxim Mikityanskiy.

  29) Add flower GRE encap/decap support to nfp driver, from Pieter
      Jansen van Vuuren.

  30) Protect against stack overflow when using act_mirred, from John
      Hurley.

  31) Allow devmap map lookups from eBPF, from Toke Høiland-Jørgensen.

  32) Use page_pool API in netsec driver, Ilias Apalodimas.

  33) Add Google gve network driver, from Catherine Sullivan.

  34) More indirect call avoidance, from Paolo Abeni.

  35) Add kTLS TX HW offload support to mlx5, from Tariq Toukan.

  36) Add XDP_REDIRECT support to bnxt_en, from Andy Gospodarek.

  37) Add MPLS manipulation actions to TC, from John Hurley.

  38) Add sending a packet to connection tracking from TC actions, and
      then allow flower classifier matching on conntrack state. From
      Paul Blakey.

  39) Netfilter hw offload support, from Pablo Neira Ayuso"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (2080 commits)
  net/mlx5e: Return in default case statement in tx_post_resync_params
  mlx5: Return -EINVAL when WARN_ON_ONCE triggers in mlx5e_tls_resync().
  net: dsa: add support for BRIDGE_MROUTER attribute
  pkt_sched: Include const.h
  net: netsec: remove static declaration for netsec_set_tx_de()
  net: netsec: remove superfluous if statement
  netfilter: nf_tables: add hardware offload support
  net: flow_offload: rename tc_cls_flower_offload to flow_cls_offload
  net: flow_offload: add flow_block_cb_is_busy() and use it
  net: sched: remove tcf block API
  drivers: net: use flow block API
  net: sched: use flow block API
  net: flow_offload: add flow_block_cb_{priv, incref, decref}()
  net: flow_offload: add list handling functions
  net: flow_offload: add flow_block_cb_alloc() and flow_block_cb_free()
  net: flow_offload: rename TCF_BLOCK_BINDER_TYPE_* to FLOW_BLOCK_BINDER_TYPE_*
  net: flow_offload: rename TC_BLOCK_{UN}BIND to FLOW_BLOCK_{UN}BIND
  net: flow_offload: add flow_block_cb_setup_simple()
  net: hisilicon: Add an tx_desc to adapt HI13X1_GMAC
  net: hisilicon: Add an rx_desc to adapt HI13X1_GMAC
  ...
</pre>
</div>
</content>
</entry>
<entry>
<title>bpf: add sockopt documentation</title>
<updated>2019-06-27T22:25:17+00:00</updated>
<author>
<name>Stanislav Fomichev</name>
<email>sdf@google.com</email>
</author>
<published>2019-06-27T20:38:54+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=0c51b3697a446e904e9e9fb70bbd7d08606a329a'/>
<id>0c51b3697a446e904e9e9fb70bbd7d08606a329a</id>
<content type='text'>
Provide user documentation about sockopt prog type and cgroup hooks.

v9:
* add details about setsockopt context and inheritance

v7:
* add description for retval=0 and optlen=-1

v6:
* describe cgroup chaining, add example

v2:
* use return code 2 for kernel bypass

Cc: Andrii Nakryiko &lt;andriin@fb.com&gt;
Cc: Martin Lau &lt;kafai@fb.com&gt;
Signed-off-by: Stanislav Fomichev &lt;sdf@google.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Provide user documentation about sockopt prog type and cgroup hooks.

v9:
* add details about setsockopt context and inheritance

v7:
* add description for retval=0 and optlen=-1

v6:
* describe cgroup chaining, add example

v2:
* use return code 2 for kernel bypass

Cc: Andrii Nakryiko &lt;andriin@fb.com&gt;
Cc: Martin Lau &lt;kafai@fb.com&gt;
Signed-off-by: Stanislav Fomichev &lt;sdf@google.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'v5.2-rc4' into mauro</title>
<updated>2019-06-14T20:18:53+00:00</updated>
<author>
<name>Jonathan Corbet</name>
<email>corbet@lwn.net</email>
</author>
<published>2019-06-14T20:18:53+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=8afecfb0ec961e37e61b2d19c4fa71617a9482de'/>
<id>8afecfb0ec961e37e61b2d19c4fa71617a9482de</id>
<content type='text'>
We need to pick up post-rc1 changes to various document files so they don't
get lost in Mauro's massive RST conversion push.
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
We need to pick up post-rc1 changes to various document files so they don't
get lost in Mauro's massive RST conversion push.
</pre>
</div>
</content>
</entry>
<entry>
<title>docs: bpf: get rid of two warnings</title>
<updated>2019-06-08T19:42:11+00:00</updated>
<author>
<name>Mauro Carvalho Chehab</name>
<email>mchehab+samsung@kernel.org</email>
</author>
<published>2019-06-07T18:54:21+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=d857a3ffd3d609d1c822b255d4fe4db8b3464e34'/>
<id>d857a3ffd3d609d1c822b255d4fe4db8b3464e34</id>
<content type='text'>
Documentation/bpf/btf.rst:154: WARNING: Unexpected indentation.
Documentation/bpf/btf.rst:163: WARNING: Unexpected indentation.

Signed-off-by: Mauro Carvalho Chehab &lt;mchehab+samsung@kernel.org&gt;
Acked-by: Song Liu &lt;songliubraving@fb.com&gt;
Signed-off-by: Jonathan Corbet &lt;corbet@lwn.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Documentation/bpf/btf.rst:154: WARNING: Unexpected indentation.
Documentation/bpf/btf.rst:163: WARNING: Unexpected indentation.

Signed-off-by: Mauro Carvalho Chehab &lt;mchehab+samsung@kernel.org&gt;
Acked-by: Song Liu &lt;songliubraving@fb.com&gt;
Signed-off-by: Jonathan Corbet &lt;corbet@lwn.net&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>bpf: doc: update answer for 32-bit subregister question</title>
<updated>2019-06-01T00:07:13+00:00</updated>
<author>
<name>Jiong Wang</name>
<email>jiong.wang@netronome.com</email>
</author>
<published>2019-05-30T20:23:18+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=c231c22a989af95fae3e75cac9d4511e0fe79377'/>
<id>c231c22a989af95fae3e75cac9d4511e0fe79377</id>
<content type='text'>
There has been quite a few progress around the two steps mentioned in the
answer to the following question:

  Q: BPF 32-bit subregister requirements

This patch updates the answer to reflect what has been done.

v2:
 - Add missing full stop. (Song Liu)
 - Minor tweak on one sentence. (Song Liu)

v1:
 - Integrated rephrase from Quentin and Jakub

Reviewed-by: Quentin Monnet &lt;quentin.monnet@netronome.com&gt;
Reviewed-by: Jakub Kicinski &lt;jakub.kicinski@netronome.com&gt;
Signed-off-by: Jiong Wang &lt;jiong.wang@netronome.com&gt;
Acked-by: Song Liu &lt;songliubraving@fb.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
There has been quite a few progress around the two steps mentioned in the
answer to the following question:

  Q: BPF 32-bit subregister requirements

This patch updates the answer to reflect what has been done.

v2:
 - Add missing full stop. (Song Liu)
 - Minor tweak on one sentence. (Song Liu)

v1:
 - Integrated rephrase from Quentin and Jakub

Reviewed-by: Quentin Monnet &lt;quentin.monnet@netronome.com&gt;
Reviewed-by: Jakub Kicinski &lt;jakub.kicinski@netronome.com&gt;
Signed-off-by: Jiong Wang &lt;jiong.wang@netronome.com&gt;
Acked-by: Song Liu &lt;songliubraving@fb.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>bpf: btf: fix the brackets of BTF_INT_OFFSET()</title>
<updated>2019-05-14T08:05:18+00:00</updated>
<author>
<name>Gary Lin</name>
<email>glin@suse.com</email>
</author>
<published>2019-05-13T09:45:48+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=948dc8c99a22d6bdcb34c194cde392e1a125928a'/>
<id>948dc8c99a22d6bdcb34c194cde392e1a125928a</id>
<content type='text'>
'VAL' should be protected by the brackets.

v2:
* Squash the fix for Documentation/bpf/btf.rst

Fixes: 69b693f0aefa ("bpf: btf: Introduce BPF Type Format (BTF)")
Signed-off-by: Gary Lin &lt;glin@suse.com&gt;
Signed-off-by: Daniel Borkmann &lt;daniel@iogearbox.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
'VAL' should be protected by the brackets.

v2:
* Squash the fix for Documentation/bpf/btf.rst

Fixes: 69b693f0aefa ("bpf: btf: Introduce BPF Type Format (BTF)")
Signed-off-by: Gary Lin &lt;glin@suse.com&gt;
Signed-off-by: Daniel Borkmann &lt;daniel@iogearbox.net&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>docs/btf: fix the missing section marks</title>
<updated>2019-05-09T22:59:59+00:00</updated>
<author>
<name>Gary Lin</name>
<email>glin@suse.com</email>
</author>
<published>2019-05-08T07:54:48+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=3ef4641fbf870ee1ecd5f890a54881b7f0e20b90'/>
<id>3ef4641fbf870ee1ecd5f890a54881b7f0e20b90</id>
<content type='text'>
The section titles of 3.4 and 3.5 are not marked correctly.

Signed-off-by: Gary Lin &lt;glin@suse.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
The section titles of 3.4 and 3.5 are not marked correctly.

Signed-off-by: Gary Lin &lt;glin@suse.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>bpf: document the verifier limits</title>
<updated>2019-04-22T22:39:12+00:00</updated>
<author>
<name>Alexei Starovoitov</name>
<email>ast@kernel.org</email>
</author>
<published>2019-04-18T01:27:01+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=3b8802446d27522cd6d32178ba975cc492611f31'/>
<id>3b8802446d27522cd6d32178ba975cc492611f31</id>
<content type='text'>
Document the verifier limits.

Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
Acked-by: Yonghong Song &lt;yhs@fb.com&gt;
Signed-off-by: Daniel Borkmann &lt;daniel@iogearbox.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Document the verifier limits.

Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
Acked-by: Yonghong Song &lt;yhs@fb.com&gt;
Signed-off-by: Daniel Borkmann &lt;daniel@iogearbox.net&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>bpf: move BPF_PROG_TYPE_FLOW_DISSECTOR documentation to a new common place</title>
<updated>2019-04-18T23:59:42+00:00</updated>
<author>
<name>Stanislav Fomichev</name>
<email>sdf@google.com</email>
</author>
<published>2019-04-18T23:47:52+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=80695946737dff4cfc1ecdefd4ebf300f132d8ee'/>
<id>80695946737dff4cfc1ecdefd4ebf300f132d8ee</id>
<content type='text'>
In commit da7031491786 ("bpf: Document BPF_PROG_TYPE_CGROUP_SYSCTL")
Andrey proposes to put per-prog type docs under Documentation/bpf/

Let's move flow dissector documentation there as well.

Signed-off-by: Stanislav Fomichev &lt;sdf@google.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
In commit da7031491786 ("bpf: Document BPF_PROG_TYPE_CGROUP_SYSCTL")
Andrey proposes to put per-prog type docs under Documentation/bpf/

Let's move flow dissector documentation there as well.

Signed-off-by: Stanislav Fomichev &lt;sdf@google.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>bpf: Document BPF_PROG_TYPE_CGROUP_SYSCTL</title>
<updated>2019-04-18T23:05:36+00:00</updated>
<author>
<name>Andrey Ignatov</name>
<email>rdna@fb.com</email>
</author>
<published>2019-04-18T05:28:57+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=da70314917862d4da4a8d7601cd47339df8b3c23'/>
<id>da70314917862d4da4a8d7601cd47339df8b3c23</id>
<content type='text'>
Add documentation for BPF_PROG_TYPE_CGROUP_SYSCTL, including general
info, attach type, context, return code, helpers, example and usage
considerations.

A separate file prog_cgroup_sysctl.rst is added to Documentation/bpf/.

In the future more program types can be documented in their own
prog_&lt;name&gt;.rst files.

Another way to place program type specific documentation would be to
group program types somehow (e.g. cgroup.rst for all cgroup-bpf
programs), but it may not scale well since some program types may belong
to different groups, e.g. BPF_PROG_TYPE_CGROUP_SKB can be documented
together with either cgroup-bpf programs or programs that access skb.

The new file is added to the index and verified by `make htmldocs` /
sanity-check by lynx.

Signed-off-by: Andrey Ignatov &lt;rdna@fb.com&gt;
Acked-by: Yonghong Song &lt;yhs@fb.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Add documentation for BPF_PROG_TYPE_CGROUP_SYSCTL, including general
info, attach type, context, return code, helpers, example and usage
considerations.

A separate file prog_cgroup_sysctl.rst is added to Documentation/bpf/.

In the future more program types can be documented in their own
prog_&lt;name&gt;.rst files.

Another way to place program type specific documentation would be to
group program types somehow (e.g. cgroup.rst for all cgroup-bpf
programs), but it may not scale well since some program types may belong
to different groups, e.g. BPF_PROG_TYPE_CGROUP_SKB can be documented
together with either cgroup-bpf programs or programs that access skb.

The new file is added to the index and verified by `make htmldocs` /
sanity-check by lynx.

Signed-off-by: Andrey Ignatov &lt;rdna@fb.com&gt;
Acked-by: Yonghong Song &lt;yhs@fb.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
</pre>
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