From: Numan Siddique <[email protected]>
This is an RFC series to address the MTU issues for OVN reported
here [1].
To address this issue, a new OVS action - check_pkt_larger is added.
A new datapath action is also added - check_pkt_len.
The datapath patch is submitted here to get feedback before submitting
to the kernel net-dev ML.
v1 of RFC included patches for datapath and OVS. This v2 series also
includes the corresponding OVN changes.
In v1, check_pkt_len datapath action was implemented as
- check_pkt_len(pkt_len, condition, userspace action if condition matches)
Eg.
check_pkt_len( > 1500 ? userspace(pid=<PID>,slow_path(check_pkt_len))
If the packet length is greater than 1500 bytes, send it to userspace.
In v2 a different approach is taken
- check_pkt_len(> pkt_len ? (set of action to apply) : (another set of
actions to apply))
Eg. check_pkt_len(> 1500 ? (2): (3))
If the packet length is greater than 1500, output to port 2, else
output to port 3.
ovs-vswitchd is modified accordingly.
The ovs action - check_pkt_larger is unchanged. It looks like
- check_pkt_larger(pkt_len)->REGISTER_BIT.
Eg. check_pkt_larger(1500)->NXM_NX_REG0[0]
If the packet is larger than 1500 bytes, REG0[0] will be set to 1.
More details in the patches.
If the approach seems reasonable, I will submit the datapath patch first
to net-dev ML first.
[1] - https://mail.openvswitch.org/pipermail/ovs-discuss/2018-July/047039.html
Datapath patch
-------------
Numan Siddique (1):
datapath: Add a new action check_pkt_len
include/uapi/linux/openvswitch.h | 25 ++++-
net/openvswitch/actions.c | 55 +++++++++-
net/openvswitch/flow_netlink.c | 175 +++++++++++++++++++++++++++++++
3 files changed, 253 insertions(+), 2 deletions(-)
OVS patches
-----------
Numan Siddique (4):
Add a new OVS action check_pkt_larger
ovn: Add a new OVN field icmp4.frag_mtu
ovn: Support OVS action 'check_pkt_larger' in OVN
ovn: Generate ICMPv4 packet in router pipeline for larger packets
.../linux/compat/include/linux/openvswitch.h | 30 ++-
include/openvswitch/ofp-actions.h | 18 ++
include/ovn/actions.h | 33 ++-
include/ovn/automake.mk | 3 +-
include/ovn/expr.h | 5 +
{ovn/lib => include/ovn}/logical-fields.h | 41 ++++
lib/dpif-netdev.c | 1 +
lib/dpif.c | 1 +
lib/odp-execute.c | 4 +
lib/odp-util.c | 36 ++++
lib/ofp-actions.c | 98 ++++++++-
lib/ofp-parse.c | 10 +
ofproto/ofproto-dpif-ipfix.c | 1 +
ofproto/ofproto-dpif-sflow.c | 1 +
ofproto/ofproto-dpif-xlate.c | 108 ++++++++++
ofproto/ofproto-dpif.c | 47 +++++
ofproto/ofproto-dpif.h | 5 +-
ovn/controller/lflow.c | 1 +
ovn/controller/lflow.h | 2 +-
ovn/controller/pinctrl.c | 38 +++-
ovn/lib/actions.c | 188 ++++++++++++++---
ovn/lib/automake.mk | 1 -
ovn/lib/expr.c | 17 +-
ovn/lib/logical-fields.c | 36 +++-
ovn/northd/ovn-northd.8.xml | 83 +++++++-
ovn/northd/ovn-northd.c | 91 ++++++++-
ovn/ovn-sb.xml | 32 +++
ovn/utilities/ovn-trace.c | 9 +-
tests/ovn.at | 193 +++++++++++++++++-
tests/test-ovn.c | 2 +-
30 files changed, 1072 insertions(+), 63 deletions(-)
rename {ovn/lib => include/ovn}/logical-fields.h (71%)
--
2.20.1
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