[net-next,00/12] xdp: a fistful of generic changes pt. II

Message

Alexander Lobakin Dec. 11, 2024, 5:26 p.m. UTC

XDP for idpf is currently 5.5 chapters:
* convert Rx to libeth;
* convert Tx and stats to libeth;
* generic XDP and XSk code changes;
* generic XDP and XSk code additions (you are here);
* actual XDP for idpf via new libeth_xdp;
* XSk for idpf (via ^).

Part III.2 does the following:
* allows mixing pages from several Page Pools within one XDP frame;
* optimizes &xdp_frame structure and removes no-more-used field;
* adds generic functions to build skbs from xdp_buffs (regular and
  XSk) and attach frags to xdp_buffs (regular and XSk);
* adds helper to optimize XSk xmit in drivers;
* makes XDP core and Page Pool a bit more netmem-friendly.

Everything is prereq for libeth_xdp, but will be useful standalone
as well: faster xdp_return_frame_bulk() and xdp_frame fields access,
less code in drivers, faster XSk XDP_PASS, smaller object code.

Alexander Lobakin (12):
  page_pool: allow mixing PPs within one bulk
  xdp: get rid of xdp_frame::mem.id
  xdp: make __xdp_return() MP-agnostic
  xdp: add generic xdp_buff_add_frag()
  xdp: add generic xdp_build_skb_from_buff()
  xsk: make xsk_buff_add_frag really add the frag via
    __xdp_buff_add_frag()
  xsk: add generic XSk &xdp_buff -> skb conversion
  xsk: add helper to get &xdp_desc's DMA and meta pointer in one go
  page_pool: add a couple of netmem counterparts
  skbuff: allow 2-4-argument skb_frag_dma_map()
  jump_label: export static_key_slow_{inc,dec}_cpuslocked()
  unroll: add generic loop unroll helpers

 include/net/page_pool/types.h                 |   6 +-
 include/linux/skbuff.h                        |  47 ++-
 include/linux/unroll.h                        |  44 +++
 include/net/page_pool/helpers.h               |  46 ++-
 include/net/xdp.h                             | 130 +++++++-
 include/net/xdp_sock_drv.h                    |  41 ++-
 include/net/xsk_buff_pool.h                   |   8 +
 .../net/ethernet/freescale/dpaa/dpaa_eth.c    |   2 +-
 drivers/net/ethernet/intel/i40e/i40e_xsk.c    |  30 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  32 +-
 drivers/net/veth.c                            |   4 +-
 kernel/bpf/cpumap.c                           |   2 +-
 kernel/jump_label.c                           |   2 +
 net/bpf/test_run.c                            |   4 +-
 net/core/filter.c                             |  17 +-
 net/core/page_pool.c                          | 109 ++++---
 net/core/xdp.c                                | 290 ++++++++++++++----
 net/xdp/xsk_buff_pool.c                       |  40 +++
 18 files changed, 645 insertions(+), 209 deletions(-)

---
Each patch except trivial 0003 and 0009 was on the lists already.

* 0001 now includes Jakub's suggestions (pre-pass + while(count));
* 0004 doesn't leak refcounts anymore (also Jakub).