sfc: move common rx code

The moved code deals with managing rx buffers and queues.
A tiny bit of refactoring was required in other files to stitch the
code together.
Signed-off-by: Alexandru-Mihai Maftei <amaftei@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/Makefile

 # SPDX-License-Identifier: GPL-2.0
 sfc-y			+= efx.o efx_common.o efx_channels.o nic.o \
 			   farch.o siena.o ef10.o \
-			   tx.o rx.o \
+			   tx.o rx.o rx_common.o \
 			   selftest.o ethtool.o ptp.o tx_tso.o \
 			   mcdi.o mcdi_port.o \
 			   mcdi_mon.o

drivers/net/ethernet/sfc/ef10.c

@@ -5,6 +5,7 @@
  */
 
 #include "net_driver.h"
+#include "rx_common.h"
 #include "ef10_regs.h"
 #include "io.h"
 #include "mcdi.h"

drivers/net/ethernet/sfc/efx.c

@@ -128,17 +128,6 @@ static int efx_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **xdpfs,
 			ASSERT_RTNL();			\
 	} while (0)
 
-/**************************************************************************
- *
- * Channel handling
- *
- *************************************************************************/
-
-void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
-{
-	mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(10));
-}
-
 /**************************************************************************
  *
  * Port handling

drivers/net/ethernet/sfc/efx.h

@@ -37,6 +37,9 @@ static inline void efx_rx_flush_packet(struct efx_channel *channel)
 		__efx_rx_packet(channel);
 }
 
+void efx_init_rx_recycle_ring(struct efx_rx_queue *rx_queue);
+struct page *efx_reuse_page(struct efx_rx_queue *rx_queue);
+
 #define EFX_MAX_DMAQ_SIZE 4096UL
 #define EFX_DEFAULT_DMAQ_SIZE 1024UL
 #define EFX_MIN_DMAQ_SIZE 512UL