This series fixes TCP HDS configuration in the fbnic driver and adds a devmem selftest for the intended behavior.
The issues fixed include setting the correct CSR for EN_HDR_SPLIT, adjusting the hds threshold clamp to avoid long headers overflowing into the payload page, and configuring the device to use L4/L3/L2 header boundaries when present by programming the DMA hint bit unconditionally for all steering rule types. Prior to these fixes, small payloads fail devmem.check_rx_hds(). Testing: IFC0=enp1s0 IFC1=eth0 export REMOTE_TYPE=netns export REMOTE_ARGS=ns-remote export NETIF=$IFC0 export LOCAL_V4=192.0.3.1 export REMOTE_V4=192.0.3.2 sysctl -w net.ipv6.conf.$IFC0.keep_addr_on_down=1 ./tools/testing/selftests/drivers/net/hw/devmem.py TAP version 13 1..4 ok 1 devmem.check_rx ok 2 devmem.check_tx ok 3 devmem.check_tx_chunks ok 4 devmem.check_rx_hds To: Alexander Duyck <[email protected]> To: Jakub Kicinski <[email protected]> To: [email protected] To: Andrew Lunn <[email protected]> To: David S. Miller <[email protected]> To: Eric Dumazet <[email protected]> To: Paolo Abeni <[email protected]> To: Mohsin Bashir <[email protected]> To: Shuah Khan <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Bobby Eshleman <[email protected]> --- Bobby Eshleman (4): eth: fbnic: set FBNIC_QUEUE_RDE_CTL0_EN_HDR_SPLIT on RDE_CTL0 eth: fbnic: increase FBNIC_HDR_BYTES_MIN from 128 to 256 bytes eth: fbnic: set DMA_HINT_L4 for all flows selftests: drv-net: add HDS payload sweep test for devmem TCP drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c | 3 +++ drivers/net/ethernet/meta/fbnic/fbnic_rpc.c | 5 ++--- drivers/net/ethernet/meta/fbnic/fbnic_txrx.c | 25 +++++++++++++---------- drivers/net/ethernet/meta/fbnic/fbnic_txrx.h | 2 +- tools/testing/selftests/drivers/net/hw/devmem.py | 19 ++++++++++++++++- tools/testing/selftests/drivers/net/hw/ncdevmem.c | 11 +++++++++- 6 files changed, 48 insertions(+), 17 deletions(-) --- base-commit: bf9cf80cab81e39701861a42877a28295ade266f change-id: 20260211-fbnic-tcp-hds-fixes-e38149aabab8 Best regards, -- Bobby Eshleman <[email protected]>
