cilium / cilium / 11593
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borkmann 
bpf: fix nodeport insns over limit regressions in netdev/overlay progs

When BPF-based nodeport is enabled, then we're running into a regression
when IPv4 + IPv6 is enabled.

  # uname -a
  Linux apoc 4.19.57 #1 SMP Thu Jul 4 12:08:20 CEST 2019 x86_64 x86_64 x86_64 GNU/Linux

With tunneling:

  level=warning msg="+ tc filter replace dev cilium_vxlan ingress prio 1 handle 1 bpf da obj bpf_overlay.o sec from-overlay" subsys=datapath-loader
  level=warning subsys=datapath-loader
  level=warning msg="Prog section '2/19' rejected: Argument list too long (7)!" subsys=datapath-loader
  level=warning msg=" - Type:         3" subsys=datapath-loader
  level=warning msg=" - Attach Type:  0" subsys=datapath-loader
  level=warning msg=" - Instructions: 4137 (41 over limit)" subsys=datapath-loader
  level=warning msg=" - License:      GPL" subsys=datapath-loader

Without tunneling:

  level=warning msg="+ tc filter replace dev eno1 egress prio 1 handle 1 bpf da obj bpf_netdev.o sec to-netdev" subsys=datapath-loader
  level=warning subsys=datapath-loader
  level=warning msg="Prog section 'to-netdev' rejected: Argument list too long (7)!" subsys=datapath-loader
  level=warning msg=" - Type:         3" subsys=datapath-loader
  level=warning msg=" - Attach Type:  0" subsys=datapath-loader
  level=warning msg=" - Instructions: 4137 (41 over limit)" subsys=datapath-loader
  level=warning msg=" - License:      GPL" subsys=datapath-loader

Given we have the full port range for NAT, it's fine and least amount of
complexity to just reduce the SNAT_COLLISION_RETRIES by one. Mid-term we'll
have a 4.19.57 kernel in our CI to avoid such regressions.

Fixes: #9451
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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Jobs
ID Job ID Ran Files Coverage
1 11593.1 0
45.34
 Travis Job 11593.1
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