Merge branch 'net-marvell-prestera-add-nexthop-routes-offloading'
Yevhen Orlov says: ==================== net: marvell: prestera: add nexthop routes offloading Add support for nexthop routes for Marvell Prestera driver. Subscribe on NEIGH_UPDATE events. Add features: - Support connected route adding e.g.: "ip address add 1.1.1.1/24 dev sw1p1" e.g.: "ip route add 6.6.6/24 dev sw1p1" - Support nexthop route adding e.g.: "ip route add 5.5.5/24 via 1.1.1.2" - Support ECMP route adding e.g.: "ip route add 5.5.5/24 nexthop via 1.1.1.2 nexthop via 1.1.1.3" - Support "offload" and "trap" flags per each nexthop - Support "offload" flag for neighbours Limitations: - Only "local" and "main" tables supported - Only generic interfaces supported for router (no bridges or vlans) Flags meaning: ip route add 5.5.5/24 nexthop via 2.2.2.2 nexthop via 2.2.2.3 ip route show ... 5.5.5.0/24 rt_offload nexthop via 2.2.2.2 dev sw1p31 weight 1 trap nexthop via 2.2.2.3 dev sw1p31 weight 1 trap ... # When you just add route - lpm entry became occupied # in HW ("rt_offload" flag), but related to nexthops neighbours # still not resolved ("trap" flag). # # After some time... ip route show ... 5.5.5.0/24 rt_offload nexthop via 2.2.2.2 dev sw1p31 weight 1 offload nexthop via 2.2.2.3 dev sw1p31 weight 1 offload ... # You will see, that appropriate neighbours was resolved and nexthop # entries occupied in HW too ("offload" flag) Co-developed-by: Taras Chornyi <tchornyi@marvell.com> Signed-off-by: Taras Chornyi <tchornyi@marvell.com> Co-developed-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu> Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.eu> Changes for v2: * Add more reviewers in CC * Check if route nexthop or direct with fib_nh_gw_family instead of fib_nh_scope This is needed after, 747c1430 ("ip: fix dflt addr selection for connected nexthop"), because direct route is now with the same scope as nexthop (RT_SCOPE_LINK) Changes for v3: * Resolve "unused functions" warnings, after patch ("net: marvell: prestera: Add heplers to interact ... "), and before patch ("net: marvell: prestera: Add neighbour cache accounting") Changes for v4: * Rebase to the latest master to resolve patch applying issues Changes for v5: * Repack structures to prevent holes * Remove unused variables * Fix misspeling issues Changes for v6: * Rebase on top of master * Fix smatch warnings Changes for v7: * Rebase on top of master * Refactor: use "fib_lookup" instead of "fib_new_table"+"fib_table_lookup", according to Paolo Abeni suggestion * Refactor: use "rhashtable_free_and_destroy" instead of rhashtable walk, according to Paolo Abeni suggestion ==================== Link: https://lore.kernel.org/r/20221001093417.22388-1-yevhen.orlov@plvision.euSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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