fix(agw): Fix for the issue related to earlier kernels as reported in #13831

[jordanvrtanoski]

Summary

Introduced conditional code block in the source of vport_gtp as a patch to OVS to fix issue reported with #13831. The code block contains implementation of the IPv6 flow lookup that is compliant to earlier kernels. The conditional block is activated only in case of kernels prior 5.4.5 and 5.3.18

Test Plan

Standard OVS integration tests ware executed.

## ------------------------------ ##
## openvswitch 2.15.4 test suite. ##
## ------------------------------ ##

layer3-tunnels

144: layer3 - ping over GTP                          ok
145: layer3 - IPv6 packets over IPv6 GTP             ok
146: layer3 - IPv6 packets over IPv4 GTP             ok
147: layer3 - IPv4 packets over IPv6 GTP             ok
148: layer3 - GTP echo match test                    ok
149: layer3 - IPv6 GTP echo match test               ok
150: layer3 - GTP echo response test                 ok
151: layer3 - IPv6 GTP echo response test            ok
152: layer3 - GTP echo response test multi endpoint  ok
153: layer3 - IPv6 GTP echo response test multi endpoint ok
154: layer3 - GTP end marker test                    ok
155: layer3 - IPv6 GTP end marker test               ok
156: layer3 - Qfi value set for uplink over GTP      ok
157: layer3 - Qfi value set for downlink over GTP    ok

## ------------- ##
## Test results. ##
## ------------- ##

All 14 tests were successful.

The patch was verified on devices with earlier kernel by using srsRAN

Additional Information

Closes #13831

[github-actions]

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[github-actions]

dp-workflow

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Results for commit f1e9850.

[github-actions]

❌ The Semantic PR check ended with status failure. See instructions on formatting your commit and pull request titles.

[m-govind]

Looks good to me.

[m-govind]

Looks good to me

[maxhbr]

Error: Unknown scope "ovs" found in pull request title "fix(ovs): Fix for the issue related to earlier kernels as reported in #13831 ". Use one of the available scopes: aaa_server, agw, amf, ci, cloud, connectiond, control_proxy, csfb, ctraced, cwg, deps, deps-dev, directoryd, dp, eap, eap_aka, eap_sim, enodebd, envoy_controller, eventd, feg, feg_hello, feg_relay, health, lte, magmad, mme, mobilityd, monitord, nms, orc8r, pipelined, policydb, radiusd, redirectd, redis, s6a_proxy, s8_proxy, sctpd, session_proxy, sessiond, smf, smsd, state, subscriberdb, swx_proxy, td-agent-bit, upf.

@jordanvrtanoski , you need to change the scope in the PR title

[MoritzThomasHuebner]

@jordanvrtanoski Is this PR still relevant, or can it be closed? I changed the scope so in theory it could be merged with approval.

[github-actions]

DP Lint & Test

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0 suites  0 💤
0 files    0 ❌

Results for commit 63d1662.

♻️ This comment has been updated with latest results.

[prabinakpattnaik]

Looks OK to me. Please rebase with Master.

[lucasgonze]

The failing tests are trivial.