[PATCH net-next v7 0/4] net: stmmac: introduce XDP rx multi-buff support

[Lorenzo Bianconi]

Rework stmmac_rx() to build the xdp_buff from all the descriptors that make
up a frame, so the XDP program runs on the whole (possibly fragmented)
packet instead of the first buffer only. Fix possible rx_q state leaks
when closing/opening the interface.

---
Changes in v7:
- Take into account the case where buf2_len is not 0 for the single
  descriptor case if the interface is running in xdp mode.
- Report rx_not_ls bit if the packet is splitted over multiple
  descriptors for dwmac100 and dwmac1000 cores.
- Link to v6: https://lore.kernel.org/r/20261012-stmmac-rx-mb-v6-0-2225050915c1@oss.qualcomm.com

Changes in v6:
- Drop patch 'net: stmmac: allow non-linear xdp_buff in XDP mode' since
  it requires some XDP fixes.
- Introduce patch 'net: stmmac: drop split frames on AF_XDP zero-copy
  RX' to always drop XDP multi-buff frames for AF_XDP mode since it not
  yet supported there.
- Introduce patch 'net: stmmac: drop multi-buffer frames in XDP mode' to
  fix pending bugs due to missing XDP multi-buffer support before patch
  'net: stmmac: rework stmmac_rx to support XDP rx multi-buff'
- Link to v5: https://lore.kernel.org/r/20261009-stmmac-rx-mb-v5-0-c38fa4eaa138@oss.qualcomm.com

Changes in v5:
- Fix possible read after bound issue in patch 1/3.
- Do not allow parsing non-linear XDP buffers if the program loaded does
  not support frags.
- Add patch 3/3 to remove MTU constraint for XDP prog.
- Link to v4: https://lore.kernel.org/r/20261006-stmmac-rx-mb-v4-0-efa4ca974e3d@oss.qualcomm.com

Changes in v4:
- Reset in_progress flag when the packet is fully consumed.
- Advetise NETDEV_XDP_ACT_RX_SG capability.
- Link to v3: https://lore.kernel.org/r/20261004-stmmac-rx-mb-v3-0-50fa171af9ec@oss.qualcomm.com

Changes in v3:
- Return secondary page in case of error.
- Introduce stmmac_xdp_shrink_tail() to remove the ethernet FCS.
- Add patch 'net: stmmac: take ownership of saved RX state at poll
  entry' from James.
- Link to v2: https://lore.kernel.org/r/20260921-stmmac-rx-mb-v2-1-6e826e1ff306@oss.qualcomm.com

Changes in v2:
- Rely on xdp_buff_add_frag() to create xdp fragments
- Fix bugs in rx_q state recording
- Fix the corner case where we receive more than MAX_SKB_FRAGS fragments
- Cosmetics
- Link to v1: https://lore.kernel.org/r/20260918-stmmac-rx-mb-v1-1-0b4517d404af@oss.qualcomm.com

---
Lorenzo Bianconi (4):
      net: stmmac: take ownership of saved RX state at poll entry
      net: stmmac: drop split frames on AF_XDP zero-copy RX
      net: stmmac: drop multi-buffer frames in XDP mode
      net: stmmac: rework stmmac_rx to support XDP rx multi-buff

 drivers/net/ethernet/stmicro/stmmac/enh_desc.c    |   2 +-
 drivers/net/ethernet/stmicro/stmmac/norm_desc.c   |   2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      |   3 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 407 ++++++++++++++--------
 4 files changed, 259 insertions(+), 155 deletions(-)
---
base-commit: 05b5019b01fb9443b09ae4ed34af1135a80a84c8
change-id: 20260918-stmmac-rx-mb-16469a2714ea

Best regards,
-- 
Lorenzo Bianconi <lorenzo.bianconi at oss.qualcomm.com>