netdev - [PATCH bpf-next v2 0/4] xsk: Tx improvements

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Date:   Thu, 16 Dec 2021 14:59:54 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, magnus.karlsson@...el.com,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH bpf-next v2 0/4] xsk: Tx improvements

Hi,
this time we're on Tx side of AF_XDP and we touch i40e and ice drivers.
Unfortunately, similar scalability issues that were addressed for XDP
processing in ice, exist on AF_XDP side. Let's resolve them in mostly
the same way as we did on [0] and utilize the Tx batching API from xsk
buffer pool.

Magnus moves the array of Tx descriptors that is used with batching
approach to the xsk buffer pool. This means that future users of this
API will not have carry the array on their own side, they can simple
refer to pool's tx_desc array, which can be seen on patch from Magnus.
Described patch is based on i40e as it is the only user of this API.
Tx batching is still left to be tried out for ice, though.

v2:
* introduce new patch that resets @next_dd and @next_rs fields
* use batching API for AF_XDP Tx on ice side

Thanks,
Magnus & Maciej

[0]: https://lore.kernel.org/bpf/20211015162908.145341-8-anthony.l.nguyen@intel.com/

Maciej Fijalkowski (3):
  ice: xsk: avoid potential dead AF_XDP Tx processing
  ice: xsk: improve AF_XDP ZC Tx and use batching API
  ice: xsk: borrow xdp_tx_active logic from i40e

Magnus Karlsson (1):
  i40e: xsk: move tmp desc array from driver to pool

 drivers/net/ethernet/intel/i40e/i40e_txrx.c   |  11 -
 drivers/net/ethernet/intel/i40e/i40e_txrx.h   |   1 -
 drivers/net/ethernet/intel/i40e/i40e_xsk.c    |   4 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c     |   4 +-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |   5 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c |   1 +
 drivers/net/ethernet/intel/ice/ice_xsk.c      | 255 ++++++++++++------
 drivers/net/ethernet/intel/ice/ice_xsk.h      |  26 +-
 include/net/xdp_sock_drv.h                    |   5 +-
 include/net/xsk_buff_pool.h                   |   1 +
 net/xdp/xsk.c                                 |  13 +-
 net/xdp/xsk_buff_pool.c                       |   7 +
 net/xdp/xsk_queue.h                           |  12 +-
 13 files changed, 216 insertions(+), 129 deletions(-)

-- 
2.33.1