[PATCH 4/6] net: fsl-fman: Store index for rxbd

[Sascha Hauer <s.hauer@pengutronix.de>]

Like done for the txbd, also store the index of the current rxbd in the
driver private data. This makes the code easier to follow.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/net/fsl-fman.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/net/fsl-fman.c b/drivers/net/fsl-fman.c
index 5dc7ed5090..196be3f6bd 100644
--- a/drivers/net/fsl-fman.c
+++ b/drivers/net/fsl-fman.c
@@ -104,8 +104,8 @@ struct fm_eth {
 	struct device_d *dev;
 	struct fm_port_global_pram *rx_pram; /* Rx parameter table */
 	struct fm_port_global_pram *tx_pram; /* Tx parameter table */
-	void *rx_bd_ring;		/* Rx BD ring base */
-	void *cur_rxbd;			/* current Rx BD */
+	struct fm_port_bd *rx_bd_ring;	/* Rx BD ring base */
+	int cur_rxbd_idx;		/* current Rx BD index */
 	void *rx_buf;			/* Rx buffer base */
 	struct fm_port_bd *tx_bd_ring;	/* Tx BD ring base */
 	int cur_txbd_idx;		/* current Tx BD index */
@@ -628,12 +628,13 @@ static int fm_eth_rx_port_parameter_init(struct fm_eth *fm_eth)
 
 	/* save them to fm_eth */
 	fm_eth->rx_bd_ring = rx_bd_ring_base;
-	fm_eth->cur_rxbd = rx_bd_ring_base;
+	fm_eth->cur_rxbd_idx = 0;
 	fm_eth->rx_buf = rx_buf_pool;
 
 	/* init Rx BDs ring */
-	rxbd = rx_bd_ring_base;
 	for (i = 0; i < RX_BD_RING_SIZE; i++) {
+		rxbd = &fm_eth->rx_bd_ring[i];
+
 		muram_writew(&rxbd->status, RxBD_EMPTY);
 		muram_writew(&rxbd->len, 0);
 		buf_hi = upper_32_bits(virt_to_phys(rx_buf_pool +
@@ -644,7 +645,6 @@ static int fm_eth_rx_port_parameter_init(struct fm_eth *fm_eth)
 					   MAX_RXBUF_LEN, DMA_FROM_DEVICE);
 		muram_writew(&rxbd->buf_ptr_hi, (u16)buf_hi);
 		out_be32(&rxbd->buf_ptr_lo, buf_lo);
-		rxbd++;
 	}
 
 	/* set the Rx queue descriptor */
@@ -891,7 +891,7 @@ static int fm_eth_recv(struct eth_device *edev)
 {
 	struct fm_eth *fm_eth = to_fm_eth(edev);
 	struct fm_port_global_pram *pram;
-	struct fm_port_bd *rxbd, *rxbd_base;
+	struct fm_port_bd *rxbd;
 	u16 status, len;
 	u32 buf_lo, buf_hi;
 	u8 *data;
@@ -899,9 +899,10 @@ static int fm_eth_recv(struct eth_device *edev)
 	int ret = 1;
 
 	pram = fm_eth->rx_pram;
-	rxbd = fm_eth->cur_rxbd;
 
 	while (1) {
+		rxbd = &fm_eth->rx_bd_ring[fm_eth->cur_rxbd_idx];
+
 		status = muram_readw(&rxbd->status);
 		if (status & RxBD_EMPTY)
 			break;
@@ -931,10 +932,7 @@ static int fm_eth_recv(struct eth_device *edev)
 		muram_writew(&rxbd->len, 0);
 
 		/* advance RxBD */
-		rxbd++;
-		rxbd_base = fm_eth->rx_bd_ring;
-		if (rxbd >= (rxbd_base + RX_BD_RING_SIZE))
-			rxbd = rxbd_base;
+		fm_eth->cur_rxbd_idx = (fm_eth->cur_rxbd_idx + 1) % RX_BD_RING_SIZE;
 
 		/* update RxQD */
 		offset_out = muram_readw(&pram->rxqd.offset_out);
@@ -943,7 +941,6 @@ static int fm_eth_recv(struct eth_device *edev)
 			offset_out = 0;
 		muram_writew(&pram->rxqd.offset_out, offset_out);
 	}
-	fm_eth->cur_rxbd = rxbd;
 
 	return ret;
 }
-- 
2.24.0


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