Re: [PATCH net-next v3 09/13] octeontx2-af: npc: cn20k: virtual index support

[Ratheesh Kannoth]

On 2026-01-11 at 04:22:52, Jakub Kicinski (kuba@xxxxxxxxxx) wrote:
> On Fri, 9 Jan 2026 11:18:24 +0530 Ratheesh Kannoth wrote:
> > This patch adds support for virtual MCAM index allocation and
> > improves CN20K MCAM defragmentation handling. A new field is
> > introduced in the non-ref, non-contiguous MCAM allocation mailbox
> > request to indicate that virtual indexes should be returned instead
> > of physical ones. Virtual indexes allow the hardware to move mapped
> > MCAM entries internally, enabling defragmentation and preventing
> > scattered allocations across subbanks. The patch also enhances
> > defragmentation by treating non-ref, non-contiguous allocations as
> > ideal candidates for packing sparsely used regions, which can free
> > up subbanks for potential x2 or x4 configuration. All such
> > allocations are tracked and always returned as virtual indexes so
> > they remain stable even when entries are moved during defrag.
> > During defragmentation, MCAM entries may shift between subbanks,
> > but their virtual indexes remain unchanged. Additionally, this
> > update fixes an issue where entry statistics were not being
> > restored correctly after defragmentation.
>
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'xa_idx2vidx_map' not described in 'npc_priv_t'
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'xa_vidx2idx_map' not described in 'npc_priv_t'
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'defrag_lh' not described in 'npc_priv_t'
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'lock' not described in 'npc_priv_t'
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'xa_idx2vidx_map' not described in 'npc_priv_t'
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'xa_vidx2idx_map' not described in 'npc_priv_t'
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'defrag_lh' not described in 'npc_priv_t'
> Warning: drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.h:203 struct member 'lock' not described in 'npc_priv_t'
ACK.