[net-next,v2,00/12] net: dpaa2-eth: AF_XDP zero-copy support

Message

Ioana Ciornei Sept. 23, 2022, 3:45 p.m. UTC

This patch set adds support for AF_XDP zero-copy in the dpaa2-eth
driver. The support is available on the LX2160A SoC and its variants and
only on interfaces (DPNIs) with a maximum of 8 queues (HW limitations
are the root cause).

We are first implementing the .get_channels() callback since this a
dependency for further work.

Patches 2-3 are working on making the necessary changes for multiple
buffer pools on a single interface. By default, without an AF_XDP socket
attached, only a single buffer pool will be used and shared between all
the queues. The changes in the functions are made in this patch, but the
actual allocation and setup of a new BP is done in patch#10.

Patches 4-5 are improving the information exposed in debugfs. We are
exposing a new file to show which buffer pool is used by what channels
and how many buffers it currently has.

The 6th patch updates the dpni_set_pools() firmware API so that we are
capable of setting up a different buffer per queue in later patches.

In the 7th patch the generic dev_open/close APIs are used instead of the
dpaa2-eth internal ones.

Patches 8-9 are rearranging the existing code in dpaa2-eth.c in order to
create new functions which will be used in the XSK implementation in
dpaa2-xsk.c

Finally, the last 3 patches are adding the actual support for both the
Rx and Tx path of AF_XDP zero-copy and some associated tracepoints.
Details on the implementation can be found in the actual patch.

Changes in v2:
 - 3/12:  Export dpaa2_eth_allocate_dpbp/dpaa2_eth_free_dpbp in this
   patch to avoid a build warning. The functions will be used in next
   patches.
 - 6/12:  Use __le16 instead of u16 for the dpbp_id field.
 - 12/12: Use xdp_buff->data_hard_start when tracing the BP seeding.

Ioana Ciornei (4):
  net: dpaa2-eth: rearrange variable in dpaa2_eth_get_ethtool_stats
  net: dpaa2-eth: export the CH#<index> in the 'ch_stats' debug file
  net: dpaa2-eth: export buffer pool info into a new debugfs file
  net: dpaa2-eth: use dev_close/open instead of the internal functions

Robert-Ionut Alexa (8):
  net: dpaa2-eth: add support to query the number of queues through
    ethtool
  net: dpaa2-eth: add support for multiple buffer pools per DPNI
  net: dpaa2-eth: update the dpni_set_pools() API to support per QDBIN
    pools
  net: dpaa2-eth: create and export the dpaa2_eth_alloc_skb function
  net: dpaa2-eth: create and export the dpaa2_eth_receive_skb() function
  net: dpaa2-eth: AF_XDP RX zero copy support
  net: dpaa2-eth: AF_XDP TX zero copy support
  net: dpaa2-eth: add trace points on XSK events

 MAINTAINERS                                   |   1 +
 drivers/net/ethernet/freescale/dpaa2/Makefile |   2 +-
 .../freescale/dpaa2/dpaa2-eth-debugfs.c       |  57 +-
 .../freescale/dpaa2/dpaa2-eth-trace.h         | 142 +++--
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.c  | 486 ++++++++++++------
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.h  | 101 +++-
 .../ethernet/freescale/dpaa2/dpaa2-ethtool.c  |  58 ++-
 .../net/ethernet/freescale/dpaa2/dpaa2-xsk.c  | 454 ++++++++++++++++
 .../net/ethernet/freescale/dpaa2/dpni-cmd.h   |  19 +-
 drivers/net/ethernet/freescale/dpaa2/dpni.c   |   6 +-
 drivers/net/ethernet/freescale/dpaa2/dpni.h   |   9 +
 11 files changed, 1093 insertions(+), 242 deletions(-)
 create mode 100644 drivers/net/ethernet/freescale/dpaa2/dpaa2-xsk.c