>-----Original Message-----
>From: Nguyen, Anthony L <anthony.l.nguyen@xxxxxxxxx>
>Sent: Tuesday, September 27, 2022 2:02 AM
>To: davem@xxxxxxxxxxxxx; kuba@xxxxxxxxxx; pabeni@xxxxxxxxxx;
>edumazet@xxxxxxxxxx
>Cc: Sokolowski, Jan <jan.sokolowski@xxxxxxxxx>; netdev@xxxxxxxxxxxxxxx;
>Nguyen, Anthony L <anthony.l.nguyen@xxxxxxxxx>; bjorn@xxxxxxxxxx;
>Fijalkowski, Maciej <maciej.fijalkowski@xxxxxxxxx>; Karlsson, Magnus
><magnus.karlsson@xxxxxxxxx>; ast@xxxxxxxxxx; daniel@xxxxxxxxxxxxx;
>hawk@xxxxxxxxxx; john.fastabend@xxxxxxxxx; bpf@xxxxxxxxxxxxxxx; Rout,
>ChandanX <chandanx.rout@xxxxxxxxx>
>Subject: [PATCH net 3/3] i40e: Fix DMA mappings leak
>
>From: Jan Sokolowski <jan.sokolowski@xxxxxxxxx>
>
>During reallocation of RX buffers, new DMA mappings are created for those
>buffers. New buffers with different RX ring count should substitute older
>ones, but those buffers were freed in i40e_configure_rx_ring and reallocated
>again with i40e_alloc_rx_bi, thus kfree on rx_bi caused leak of already
>mapped DMA.
>
>In case of non XDP ring, do not free rx_bi and reuse already existing buffer,
>move kfree to XDP rings only, remove unused i40e_alloc_rx_bi function.
>
>steps for reproduction:
>while :
>do
>for ((i=0; i<=8160; i=i+32))
>do
>ethtool -G enp130s0f0 rx $i tx $i
>sleep 0.5
>ethtool -g enp130s0f0
>done
>done
>
>Fixes: be1222b585fd ("i40e: Separate kernel allocated rx_bi rings from AF_XDP
>rings")
>Signed-off-by: Jan Sokolowski <jan.sokolowski@xxxxxxxxx>
>Tested-by: Chandan <chandanx.rout@xxxxxxxxx> (A Contingent Worker at
>Intel)
>Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
>---
> .../net/ethernet/intel/i40e/i40e_ethtool.c | 3 -
> drivers/net/ethernet/intel/i40e/i40e_main.c | 13 ++--
> drivers/net/ethernet/intel/i40e/i40e_txrx.c | 13 ++--
> drivers/net/ethernet/intel/i40e/i40e_txrx.h | 1 -
> drivers/net/ethernet/intel/i40e/i40e_xsk.c | 67 ++++++++++++++++---
> drivers/net/ethernet/intel/i40e/i40e_xsk.h | 2 +-
> 6 files changed, 71 insertions(+), 28 deletions(-)
Tested-by: Chandan <chandanx.rout@xxxxxxxxx> (A Contingent Worker at Intel)
