Merge branch 'net-lan969x-add-fdma-support'

Daniel Machon says:

====================
net: lan969x: add FDMA support

== Description:

This series is the last of a multi-part series, that prepares and adds
support for the new lan969x switch driver.

The upstreaming efforts has been split into multiple series:

        1) Prepare the Sparx5 driver for lan969x (merged)

        2) Add support for lan969x (same basic features as Sparx5
           provides excl. FDMA and VCAP, merged).

        3) Add lan969x VCAP functionality (merged).

        4) Add RGMII support (merged).

    --> 5) Add FDMA support.

== FDMA support:

The lan969x switch device uses the same FDMA engine as the Sparx5 switch
device, with the same number of channels etc. This means we can utilize
the newly added FDMA library, that is already in use by the lan966x and
sparx5 drivers.

As previous lan969x series, the FDMA implementation will hook into the
Sparx5 implementation where possible, however both RX and TX handling
will be done differently on lan969x and therefore requires a separate
implementation of the RX and TX path.

Details are in the commit description of the individual patches

== Patch breakdown:

Patch #1: Enable FDMA support on lan969x
Patch #2: Split start()/stop() functions
Patch #3: Activate TX FDMA in start()
Patch #4: Ops out a few functions that differ on the two platforms
Patch #5: Add FDMA implementation for lan969x

v1: https://lore.kernel.org/20250109-sparx5-lan969x-switch-driver-5-v1-0-13d6d8451e63@microchip.com
====================

Link: https://patch.msgid.link/20250113-sparx5-lan969x-switch-driver-5-v2-0-c468f02fd623@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/microchip/sparx5/Kconfig

@@ -28,5 +28,6 @@ config SPARX5_DCB
 config LAN969X_SWITCH
 	bool "Lan969x switch driver"
 	depends on SPARX5_SWITCH
+	select PAGE_POOL
 	help
 	  This driver supports the lan969x family of network switch devices.

drivers/net/ethernet/microchip/sparx5/Makefile

@@ -21,7 +21,8 @@ sparx5-switch-$(CONFIG_LAN969X_SWITCH) += lan969x/lan969x_regs.o \
 					  lan969x/lan969x_calendar.o \
 					  lan969x/lan969x_vcap_ag_api.o \
 					  lan969x/lan969x_vcap_impl.o \
-					  lan969x/lan969x_rgmii.o
+					  lan969x/lan969x_rgmii.o \
+					  lan969x/lan969x_fdma.o
 
 # Provide include files
 ccflags-y += -I$(srctree)/drivers/net/ethernet/microchip/vcap

drivers/net/ethernet/microchip/sparx5/lan969x/lan969x.c

@@ -341,6 +341,10 @@ static const struct sparx5_ops lan969x_ops = {
 	.ptp_irq_handler         = &lan969x_ptp_irq_handler,
 	.dsm_calendar_calc       = &lan969x_dsm_calendar_calc,
 	.port_config_rgmii       = &lan969x_port_config_rgmii,
+	.fdma_init               = &lan969x_fdma_init,
+	.fdma_deinit             = &lan969x_fdma_deinit,
+	.fdma_poll               = &lan969x_fdma_napi_poll,
+	.fdma_xmit               = &lan969x_fdma_xmit,
 };
 
 const struct sparx5_match_data lan969x_desc = {

drivers/net/ethernet/microchip/sparx5/lan969x/lan969x.h

@@ -72,4 +72,11 @@ int lan969x_dsm_calendar_calc(struct sparx5 *sparx5, u32 taxi,
 int lan969x_port_config_rgmii(struct sparx5_port *port,
 			      struct sparx5_port_config *conf);
 
+/* lan969x_fdma.c */
+int lan969x_fdma_init(struct sparx5 *sparx5);
+int lan969x_fdma_deinit(struct sparx5 *sparx5);
+int lan969x_fdma_napi_poll(struct napi_struct *napi, int weight);
+int lan969x_fdma_xmit(struct sparx5 *sparx5, u32 *ifh, struct sk_buff *skb,
+		      struct net_device *dev);
+
 #endif