net: stmmac: Refactor FPE as a separate module

Refactor FPE implementation by moving common code for DWMAC4 and DWXGMAC into a separate FPE module.

FPE implementation for DWMAC4 and DWXGMAC differs only for:
1) Offset address of MAC_FPE_CTRL_STS and MTL_FPE_CTRL_STS
2) FPRQ(Frame Preemption Residue Queue) field in MAC_RxQ_Ctrl1
3) Bit offset of Frame Preemption Interrupt Enable

Tested on DWMAC CORE 5.20a and DWXGMAC CORE 3.20a

Changes in v8:
1. Reorder functions in their natural calling order
2. Unexport stmmac_fpe_configure() and make it static
3. Swap 3rd patch and 4th patch in V7

V7:

    https://patchwork.kernel.org/project/netdevbpf/list/?series=905021&state=%2A&archive=both

Changes in v7:
1. Split stmmac_fpe_supported() changes into a separate patch
2. Unexport stmmac_fpe_send_mpacket() and make it static
3. Convert to netdev_get_num_tc()
4. Commit message update for the 3rd patch

V6:

    https://patchwork.kernel.org/project/netdevbpf/list/?series=904502&state=%2A&archive=both

Changes in v6:
1. Introduce stmmac_fpe_supported() to improve compatibility
2. Remove redundant fpesel check
3. Remove redundant parameters of stmmac_fpe_configure()

V5:

    https://patchwork.kernel.org/project/netdevbpf/list/?series=903628&state=%2A&archive=both

Changes in v5:
1. Fix build errors reported by kernel test robot:
https://lore.kernel.org/oe-kbuild-all/[email protected]/

Changes in v4:
1. Update FPE IRQ handling
2. Check fpesel bit and stmmac_fpe_reg pointer to guarantee that driver does not crash on a certain platform that FPE is to be implemented

Changes in v3:
1. Drop stmmac_fpe_ops and refactor FPE functions to generic version to avoid function pointers
2. Drop the _SHIFT macro definitions

Changes in v2:
1. Split patches to easily review
2. Use struct as function param to keep param list short
3. Typo fixes in commit message and title

Furong Xu (8):
net: stmmac: Introduce separate files for FPE implementation
net: stmmac: Rework macro definitions for gmac4 and xgmac
net: stmmac: Introduce stmmac_fpe_supported()
net: stmmac: Refactor FPE functions to generic version
net: stmmac: Get the TC number of net_device by netdev_get_num_tc()
net: stmmac: xgmac: Rename XGMAC_RQ to XGMAC_FPRQ
net: stmmac: xgmac: Complete FPE support
net: stmmac: xgmac: Enable FPE for tc-mqprio/tc-taprio

 drivers/net/ethernet/stmicro/stmmac/Makefile  |   2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac4.h  |   1 -
 .../net/ethernet/stmicro/stmmac/dwmac4_core.c |  11 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac5.c  | 150 -------
 drivers/net/ethernet/stmicro/stmmac/dwmac5.h  |  26 --
 .../net/ethernet/stmicro/stmmac/dwxgmac2.h    |   6 +-
 .../ethernet/stmicro/stmmac/dwxgmac2_core.c   |  31 +-
 drivers/net/ethernet/stmicro/stmmac/hwif.c    |   7 +
 drivers/net/ethernet/stmicro/stmmac/hwif.h    |  20 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  11 +-
 .../ethernet/stmicro/stmmac/stmmac_ethtool.c  |   8 +-
 .../net/ethernet/stmicro/stmmac/stmmac_fpe.c  | 413 ++++++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_fpe.h  |  33 ++
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 165 +------
 .../net/ethernet/stmicro/stmmac/stmmac_tc.c   |   4 +-
 15 files changed, 476 insertions(+), 412 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_fpe.c
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_fpe.h

2.34.1