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net/mlx5e: TC, anchor peer-flow reverse index on the duplicated flow

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A TC eswitch flow offloaded to a shared FDB is duplicated onto every
peer eswitch. Besides the forward list of duplicates on the origin flow
(mlx5e_tc_flow.peer_flows), the eswitch keeps a reverse index,
esw->offloads.peer_flows[], an array of per-peer list heads keyed by the
peer's LAG sequence number, used to tear down a peer's duplicates when
it is removed.

That reverse index was anchored on the origin: since one origin can have
a duplicate on every peer, the origin carried per-peer storage sized to
the max port count - a peer[MLX5_MAX_PORTS] array of list nodes plus a
peer_used bitmap - and each duplicate stored its peer_index.

Anchor it on the duplicate instead, which belongs to a single peer. Give
each flow one list node, mlx5e_tc_flow.peer, and place the duplicate -
not the origin - on its peer's list through it; add a peer_orig back-ref
so del can reach the origin from the duplicate. One node then replaces
the origin's per-peer array, and del unlinks the duplicate directly, so
peer[], peer_used and peer_index are dropped.

The per-peer list heads remain the fixed esw->offloads.peer_flows[]
array keyed by the LAG sequence number - that array is replaced in the
next patch.  No functional change.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Akiva Goldberger <agoldberger@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260923103830.1183-8-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Shay Drory 2026-09-23 13:38:24 +03:00 • committed by Jakub Kicinski
commit 675956237b
2 changed files with 29 additions and 44 deletions
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