[PATCH V3 0/4] dmaengine: xilinx_dma: MCDMA descriptor and metadata handling improvements

[Srinivas Neeli]

This series improves the Xilinx AXI DMA and MCDMA driver's descriptor
handling and metadata reporting. It fixes direction-specific descriptor
field usage, ensures completion is based on the hardware completion bit
(important with interrupt coalescing), and extends metadata handling to
expose status and sideband fields alongside APP fields.

The axienet driver is updated to derive RX frame length from the standard
dmaengine residue mechanism rather than descriptor APP fields, making it
work on designs where the AXI4-Stream status/control interface is not
present.

Changes in V3:
 - Patch 1: Renamed subject, added static_assert for descriptor size,
   refactored residue calculation for clarity.
 - Patch 2: Added Fixes tag, expanded commit message explaining interrupt
   coalescing scenario, simplified completion check logic.
 - Patch 3: New patch - axienet now uses result->residue for RX length
   instead of APP metadata, removing dependency on status/control stream.
 - Patch 4: Complete rewrite - metadata pointer now starts at status field
   (index 0) exposing status/sideband to clients; uses EOF descriptor;
   removed 'chan' field from descriptor struct.
 - Dropped V2 patches 4/5 (dt-bindings) and 5/5 (xferred_bytes) as the
   approach changed to use standard residue mechanism.

Changes in V2:
 - Rebased on the AXI DMA binding YAML conversion.
 - Added xlnx,include-stscntrl-strm in the YAML binding.
 - Clarified cover letter to reflect metadata behavior with and without
   APP fields.
https://lore.kernel.org/all/20260309033444.3472359-1-abin.joseph@xxxxxxx/

Srinivas Neeli (3):
  dmaengine: xilinx_dma: Fix MCDMA descriptor fields based on DMA
    direction
  dmaengine: xilinx_dma: Move descriptors to done list based on
    completion bit
  net: xilinx: axienet: Derive RX frame length from DMA residue

Suraj Gupta (1):
  dmaengine: xilinx_dma: Extend metadata handling for AXI DMA and MCDMA

 drivers/dma/xilinx/xilinx_dma.c               | 85 ++++++++++++++++---
 .../net/ethernet/xilinx/xilinx_axienet_main.c | 14 ++-
 2 files changed, 76 insertions(+), 23 deletions(-)

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2.25.1