linux-toradex.git/include/linux/netdevice.h, branch v4.15

net: accept UFO datagrams from tuntap and packet

2017-11-23T16:37:35+00:00

Tuntap and similar devices can inject GSO packets. Accept type
VIRTIO_NET_HDR_GSO_UDP, even though not generating UFO natively.

Processes are expected to use feature negotiation such as TUNSETOFFLOAD
to detect supported offload types and refrain from injecting other
packets. This process breaks down with live migration: guest kernels
do not renegotiate flags, so destination hosts need to expose all
features that the source host does.

Partially revert the UFO removal from 182e0b6b5846~1..d9d30adf5677.
This patch introduces nearly(*) no new code to simplify verification.
It brings back verbatim tuntap UFO negotiation, VIRTIO_NET_HDR_GSO_UDP
insertion and software UFO segmentation.

It does not reinstate protocol stack support, hardware offload
(NETIF_F_UFO), SKB_GSO_UDP tunneling in SKB_GSO_SOFTWARE or reception
of VIRTIO_NET_HDR_GSO_UDP packets in tuntap.

To support SKB_GSO_UDP reappearing in the stack, also reinstate
logic in act_csum and openvswitch. Achieve equivalence with v4.13 HEAD
by squashing in commit 939912216fa8 ("net: skb_needs_check() removes
CHECKSUM_UNNECESSARY check for tx.") and reverting commit 8d63bee643f1
("net: avoid skb_warn_bad_offload false positives on UFO").

(*) To avoid having to bring back skb_shinfo(skb)->ip6_frag_id,
ipv6_proxy_select_ident is changed to return a __be32 and this is
assigned directly to the frag_hdr. Also, SKB_GSO_UDP is inserted
at the end of the enum to minimize code churn.

Tested
  Booted a v4.13 guest kernel with QEMU. On a host kernel before this
  patch `ethtool -k eth0` shows UFO disabled. After the patch, it is
  enabled, same as on a v4.13 host kernel.

  A UFO packet sent from the guest appears on the tap device:
    host:
      nc -l -p -u 8000 &
      tcpdump -n -i tap0

    guest:
      dd if=/dev/zero of=payload.txt bs=1 count=2000
      nc -u 192.16.1.1 8000 < payload.txt

  Direct tap to tap transmission of VIRTIO_NET_HDR_GSO_UDP succeeds,
  packets arriving fragmented:

    ./with_tap_pair.sh ./tap_send_ufo tap0 tap1
    (from https://github.com/wdebruij/kerneltools/tree/master/tests)

Changes
  v1 -> v2
    - simplified set_offload change (review comment)
    - documented test procedure

Link: http://lkml.kernel.org/r/
Fixes: fb652fdfe837 ("macvlan/macvtap: Remove NETIF_F_UFO advertisement.")
Reported-by: Michal Kubecek 
Signed-off-by: Willem de Bruijn 
Acked-by: Jason Wang 
Signed-off-by: David S. Miller

net: fix incorrect comment with regard to VLAN packet handling

2017-11-10T09:04:21+00:00

The commit bcc6d4790361 ("net: vlan: make non-hw-accel rx path similar
to hw-accel") unified accel and non-accel path for VLAN RX. With that
fix we do not register any packet_type handler for VLANs anymore, so fix
the incorrect comment.

Signed-off-by: Girish Moodalbail 
Signed-off-by: David S. Miller

net: Introduce netdev_*_once functions

2017-11-09T04:27:01+00:00

Extend the net device error logging with netdev_*_once macros.
netdev_*_once are the equivalents of the dev_*_once macros which are
useful for messages that should only be logged once.

Also add netdev_WARN_ONCE, which is the "once" extension for the already
existing netdev_WARN macro.

Signed-off-by: Gal Pressman 
Signed-off-by: Saeed Mahameed

net_sch: cbs: Change TC_SETUP_CBS to TC_SETUP_QDISC_CBS

2017-11-08T03:23:38+00:00

Change TC_SETUP_CBS to TC_SETUP_QDISC_CBS to match the new convention..

Signed-off-by: Nogah Frankel 
Signed-off-by: Jiri Pirko 
Reviewed-by: Simon Horman 
Acked-by: Vinicius Costa Gomes 
Signed-off-by: David S. Miller

net_sch: mqprio: Change TC_SETUP_MQPRIO to TC_SETUP_QDISC_MQPRIO

2017-11-08T03:23:38+00:00

Change TC_SETUP_MQPRIO to TC_SETUP_QDISC_MQPRIO to match the new
convention.

Signed-off-by: Nogah Frankel 
Signed-off-by: Jiri Pirko 
Reviewed-by: Simon Horman 
Signed-off-by: David S. Miller

net_sch: red: Add offload ability to RED qdisc

2017-11-08T03:23:37+00:00

Add the ability to offload RED qdisc by using ndo_setup_tc.
There are four commands for RED offloading:
* TC_RED_SET: handles set and change.
* TC_RED_DESTROY: handle qdisc destroy.
* TC_RED_STATS: update the qdiscs counters (given as reference)
* TC_RED_XSTAT: returns red xstats.

Whether RED is being offloaded is being determined every time dump action
is being called because parent change of this qdisc could change its
offload state but doesn't require any RED function to be called.

Signed-off-by: Nogah Frankel 
Signed-off-by: Jiri Pirko 
Reviewed-by: Simon Horman 
Signed-off-by: David S. Miller

bpf: offload: add infrastructure for loading programs for a specific netdev

2017-11-05T13:26:18+00:00

The fact that we don't know which device the program is going
to be used on is quite limiting in current eBPF infrastructure.
We have to reverse or limit the changes which kernel makes to
the loaded bytecode if we want it to be offloaded to a networking
device.  We also have to invent new APIs for debugging and
troubleshooting support.

Make it possible to load programs for a specific netdev.  This
helps us to bring the debug information closer to the core
eBPF infrastructure (e.g. we will be able to reuse the verifer
log in device JIT).  It allows device JITs to perform translation
on the original bytecode.

__bpf_prog_get() when called to get a reference for an attachment
point will now refuse to give it if program has a device assigned.
Following patches will add a version of that function which passes
the expected netdev in. @type argument in __bpf_prog_get() is
renamed to attach_type to make it clearer that it's only set on
attachment.

All calls to ndo_bpf are protected by rtnl, only verifier callbacks
are not.  We need a wait queue to make sure netdev doesn't get
destroyed while verifier is still running and calling its driver.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Simon Horman 
Reviewed-by: Quentin Monnet 
Signed-off-by: David S. Miller

net: bpf: rename ndo_xdp to ndo_bpf

2017-11-05T13:26:18+00:00

ndo_xdp is a control path callback for setting up XDP in the
driver.  We can reuse it for other forms of communication
between the eBPF stack and the drivers.  Rename the callback
and associated structures and definitions.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Simon Horman 
Reviewed-by: Quentin Monnet 
Signed-off-by: David S. Miller

net: core: introduce mini_Qdisc and eliminate usage of tp->q for clsact fastpath

2017-11-03T12:57:24+00:00

In sch_handle_egress and sch_handle_ingress tp->q is used only in order
to update stats. So stats and filter list are the only things that are
needed in clsact qdisc fastpath processing. Introduce new mini_Qdisc
struct to hold those items. Also, introduce a helper to swap the
mini_Qdisc structures in case filter list head changes.

This removes need for tp->q usage without added overhead.

Signed-off-by: Jiri Pirko 
Signed-off-by: David S. Miller

net/sched: Add support for HW offloading for CBS

2017-10-27T16:49:24+00:00

This adds support for offloading the CBS algorithm to the controller,
if supported. Drivers wanting to support CBS offload must implement
the .ndo_setup_tc callback and handle the TC_SETUP_CBS (introduced
here) type.

Signed-off-by: Vinicius Costa Gomes 
Tested-by: Henrik Austad 
Signed-off-by: Jeff Kirsher