netdev - [PATCH net-next v2 0/6] tsnep: XDP socket zero-copy support

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Date:   Sat, 15 Apr 2023 16:42:50 +0200
From:   Gerhard Engleder <gerhard@...leder-embedded.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com,
        pabeni@...hat.com, bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, jonathan.lemon@...il.com,
        Gerhard Engleder <gerhard@...leder-embedded.com>
Subject: [PATCH net-next v2 0/6] tsnep: XDP socket zero-copy support

Implement XDP socket zero-copy support for tsnep driver. I tried to
follow existing drivers like igc as far as possible. But one main
difference is that tsnep does not need any reconfiguration for XDP BPF
program setup. So I decided to keep this behavior no matter if a XSK
pool is used or not. As a result, tsnep starts using the XSK pool even
if no XDP BPF program is available.

Another difference is that I tried to prevent potentially failing
allocations during XSK pool setup. E.g. both memory models for page pool
and XSK pool are registered all the time. Thus, XSK pool setup cannot
end up with not working queues.

Some prework is done to reduce the last two XSK commits to actual XSK
changes.

v2:
- eliminate modulo op in TX/RX path (Maciej Fijalkowski)
- eliminate retval variable in tsnep_rx_alloc_zc() (Maciej Fijalkowski)
- scope variable entry within loop (Maciej Fijalkowski)
- use DMA_ATTR_SKIP_CPU_SYNC directly (Maciej Fijalkowski)
- union for page/xdp in tsnep_rx_entry (Maciej Fijalkowski)
- provide performance numbers (Maciej Fijalkowski)
- use xsk_buff_alloc_batch() (Maciej Fijalkowski)
- use xsk_tx_peek_release_desc_batch() (Maciej Fijalkowski)
- don't call tsnep_rx_reopen() if netdev is down
- init adapter pointer of queue only once

Gerhard Engleder (6):
  tsnep: Replace modulo operation with mask
  tsnep: Rework TX/RX queue initialization
  tsnep: Add functions for queue enable/disable
  tsnep: Move skb receive action to separate function
  tsnep: Add XDP socket zero-copy RX support
  tsnep: Add XDP socket zero-copy TX support

 drivers/net/ethernet/engleder/tsnep.h      |  16 +-
 drivers/net/ethernet/engleder/tsnep_main.c | 864 ++++++++++++++++++---
 drivers/net/ethernet/engleder/tsnep_xdp.c  |  66 ++
 3 files changed, 823 insertions(+), 123 deletions(-)

-- 
2.30.2