netdev - [RFC bpf-next 0/4] add partial rx hw csum offload support for XDP

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Date:   Fri, 28 May 2021 19:43:40 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        daniel@...earbox.net, ast@...nel.org, echaudro@...hat.com,
        dsahern@...il.com, magnus.karlsson@...el.com, toke@...hat.com,
        brouer@...hat.com, bjorn@...nel.org, maciej.fijalkowski@...el.com,
        john.fastabend@...il.com
Subject: [RFC bpf-next 0/4] add partial rx hw csum offload support for XDP

Enable xdp rx checksum offload support for CHECKSUM_UNNECESSARY use-case.
Introduce flag field in xdp_buff/xdp_frame in order to save the checksum
result from the NIC and have a fast access to it performing XDP_REDIRECT.
CHECKSUM_COMPLETE is not supported yet since it will require adding the
csum result to the xdp_metadata area.
Moreover flag field will be reused for xdp multi-buff support.
This series has been tested generating UDP traffic with pktgen and performing
a xdp_redirect from an ixgbe device to a remote CPUMAP entry. PPS results show
a negligible penalty respect to the baseline where the UDP checksum has been
disabled. More info about the test can be found here [0].

[0] https://github.com/xdp-project/xdp-project/blob/master/areas/core/xdp_frame01_checksum.org

Lorenzo Bianconi (4):
  net: xdp: introduce flags field in xdp_buff and xdp_frame
  mvneta: return csum computation result from mvneta_rx_csum
  net: mvneta: report csum result in xdp_buff
  net: xdp: update csum building the skb

 drivers/net/ethernet/marvell/mvneta.c | 27 ++++++++------------
 include/net/xdp.h                     | 36 +++++++++++++++++++++++++++
 net/core/xdp.c                        |  2 +-
 3 files changed, 48 insertions(+), 17 deletions(-)

-- 
2.31.1