Automated cherry pick of #5942: Update maximum number of buckets in an OVS group message #6017
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hongliangl
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) The current implementation limits the maximum number of buckets in an OVS group add/insert_bucket message to 800. This constraint is based on the fact that each bucket has 3 actions, such as `set_field:0xa0a0007->reg0`, `set_field:0x50/0xffff->reg4`, and `resubmit(,EndpointDNAT)`. However, an update in antrea-io#5205 introduced a new action, `set_field:0x4000000/0x4000000->reg4`, for remote Endpoints, making it impossible to accommodate 800 buckets with 4 actions in an OVS group add/insert_bucket message. To overcome the limitation, we set the maximum number of buckets to 700, considering the worst-case scenario where each bucket includes all available actions. For example, a bucket with all available actions, which is for a remote non-hostNetwork IPv6 Service Endpoint like this: `set_field:0xa0a0007->xxreg0`, `set_field:0x50/0xffff->reg4`, `set_field:0x100000/0x100000->reg4`, and `resubmit(,EndpointDNAT)`. The size of such bucket is 88 bytes, and the header size of an OVS group message is 24 bytes. According to https://opennetworking.org/wp-content/uploads/2014/10/openflow-switch-v1.5.1.pdf, the max size of an Openflow 1.5 message is 65535 bytes, as a result, a message can have a maximum of 744 buckets, calculated with (65535-24)/88, using the largest possible size. Signed-off-by: Hongliang Liu <lhongliang@vmware.com>
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Cherry pick of #5942 on release-1.14.
#5942: Update maximum number of buckets in an OVS group message
For details on the cherry pick process, see the cherry pick requests page.