[PATCH net-next 1/5] sfc: add new helper macros to iterate channels by type

["Íñigo Huguet" <ihuguet@redhat.com>]

Sometimes in the driver it's needed to iterate a subset of the channels
depending on whether it is an rx, tx or xdp channel. Now it's done
iterating over all channels and checking if it's of the desired type,
leading to too much nested and a bit complex to understand code.

Add new iterator macros to allow iterating only over a single type of
channel.

Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
---
 drivers/net/ethernet/sfc/net_driver.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 318db906a154..7f665ba6a082 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -1501,6 +1501,27 @@ efx_get_channel(struct efx_nic *efx, unsigned index)
 	     _channel = (_channel->channel + 1 < (_efx)->n_channels) ?	\
 		     (_efx)->channel[_channel->channel + 1] : NULL)
 
+#define efx_for_each_rx_channel(_channel, _efx)				    \
+	for (_channel = (_efx)->channel[0];				    \
+	     _channel;							    \
+	     _channel = (_channel->channel + 1 < (_efx)->n_rx_channels) ?   \
+		     (_efx)->channel[_channel->channel + 1] : NULL)
+
+#define efx_for_each_tx_channel(_channel, _efx)				    \
+	for (_channel = (_efx)->channel[efx->tx_channel_offset];	    \
+	     _channel;							    \
+	     _channel = (_channel->channel + 1 <			    \
+		     (_efx)->tx_channel_offset + (_efx)->n_tx_channels) ?   \
+		     (_efx)->channel[_channel->channel + 1] : NULL)
+
+#define efx_for_each_xdp_channel(_channel, _efx)			    \
+	for (_channel = ((_efx)->n_xdp_channels > 0) ?			    \
+		     (_efx)->channel[efx->xdp_channel_offset] : NULL;	    \
+	     _channel;							    \
+	     _channel = (_channel->channel + 1 <			    \
+		     (_efx)->xdp_channel_offset + (_efx)->n_xdp_channels) ? \
+		     (_efx)->channel[_channel->channel + 1] : NULL)
+
 /* Iterate over all used channels in reverse */
 #define efx_for_each_channel_rev(_channel, _efx)			\
 	for (_channel = (_efx)->channel[(_efx)->n_channels - 1];	\
-- 
2.34.1