[PATCH net-next 00/15] eth: fbnic: support queue API and zero-copy Rx

[Jakub Kicinski <kuba@kernel.org>]

Add support for queue API to fbnic, enable zero-copy Rx.

The first patch adds page_pool_get(), I alluded to this
new helper when dicussing commit 64fdaa94bfe0 ("net: page_pool:
allow enabling recycling late, fix false positive warning").
For page pool-oriented reviewers another patch of interest
is patch 11, which adds a helper to test whether rxq wants
to create a unreadable page pool. mlx5 already has this
sort of a check, we said we will add a helper when more
drivers need it (IIRC), so I guess now is the time.

Patches 2-4 reshuffle the Rx init/allocation path to better
align structures and functions which operate on them. Notably
patch 2 moves the page pool pointer to the queue struct (from
NAPI).

Patch 5 converts the driver to use netmem_ref. The driver has
separate and explicit buffer queue for scatter / payloads,
so only references to those are converted.

Next 5 patches are more boring code shifts.

Patch 12 adds unreadable memory support to page pool allocation.

Patch 15 finally adds the support for queue API.

  $ ./tools/testing/selftests/drivers/net/hw/iou-zcrx.py
  TAP version 13
  1..3
  ok 1 iou-zcrx.test_zcrx
  ok 2 iou-zcrx.test_zcrx_oneshot
  ok 3 iou-zcrx.test_zcrx_rss
  # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0

Jakub Kicinski (15):
  net: page_pool: add page_pool_get()
  eth: fbnic: move page pool pointer from NAPI to the ring struct
  eth: fbnic: move xdp_rxq_info_reg() to resource alloc
  eth: fbnic: move page pool alloc to fbnic_alloc_rx_qt_resources()
  eth: fbnic: use netmem_ref where applicable
  eth: fbnic: request ops lock
  eth: fbnic: split fbnic_disable()
  eth: fbnic: split fbnic_flush()
  eth: fbnic: split fbnic_enable()
  eth: fbnic: split fbnic_fill()
  net: page_pool: add helper to pre-check if PP will be unreadable
  eth: fbnic: allocate unreadable page pool for the payloads
  eth: fbnic: defer page pool recycling activation to queue start
  eth: fbnic: don't pass NAPI into pp alloc
  eth: fbnic: support queue ops / zero-copy Rx

 drivers/net/ethernet/meta/fbnic/fbnic_txrx.h  |  20 +-
 include/net/page_pool/helpers.h               |  14 +
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  11 +-
 .../net/ethernet/mellanox/mlx5/core/en_main.c |  10 +-
 .../net/ethernet/meta/fbnic/fbnic_netdev.c    |   1 +
 drivers/net/ethernet/meta/fbnic/fbnic_pci.c   |   9 +-
 drivers/net/ethernet/meta/fbnic/fbnic_txrx.c  | 621 ++++++++++++------
 net/core/page_pool.c                          |   8 +
 8 files changed, 459 insertions(+), 235 deletions(-)

-- 
2.50.1