[PATCH net-next 0/3] net: stmmac: page pool Tx buffer quirk

From: Nazim Amirul <[email protected]>

This series adds optional use of page pool buffers for stmmac transmit
instead of per-packet streaming dma map/unmap.

On platforms with an IOMMU, the invalidate cost of map/unmap can dominate
small-packet Tx performance. Copying into recycled, already-mapped page
pool buffers can be cheaper. The feature is opt-in via a new DT flag
snps,pagepool-tx-buf-quirk, and is enabled for Agilex5 GMACs.

Page pool Tx buffers are only used for single-fragment, non-TSO frames.

Patches 1-2 are based on netdev/net-next. Patch 3 (DTS) is based on
Dinh Nguyen's socfpga for-next tree.

Nazim Amirul (3):
  dt-bindings: net: snps,dwmac: Add snps,pagepool-tx-buf-quirk
  net: stmmac: Use pagepool instead of streaming buffers for Tx
  arm64: dts: agilex5: Enable pagepool Tx buffer quirk

 .../devicetree/bindings/net/snps,dwmac.yaml   |  8 +++
 .../boot/dts/intel/socfpga_agilex5.dtsi       |  3 +
 .../net/ethernet/stmicro/stmmac/stmmac.h      |  3 +
 .../ethernet/stmicro/stmmac/stmmac_main.c     | 75 +++++++++++++++++--
 .../ethernet/stmicro/stmmac/stmmac_platform.c |  2 +
 include/linux/stmmac.h                        |  1 +
 6 files changed, 81 insertions(+), 11 deletions(-)

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2.43.7