From: Claudiu Manoil <claudiu.manoil@nxp.com>
Date: Tue, 10 Mar 2020 12:51:23 +0000 (+0200)
Subject: enetc: Clean up Rx BD iteration
X-Git-Tag: v5.10.7~2946^2~208^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=714239ac630a85919839f200d4499b7f811c7003;p=platform%2Fkernel%2Flinux-rpi.git

enetc: Clean up Rx BD iteration

Improve maintainability of the code iterating the Rx buffer
descriptors to prepare it to support iterating extended Rx BD
descriptors as well.
Don't increment by one the h/w descriptor pointers explicitly,
provide an iterator that takes care of the h/w details.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 1f79e36..f1bbaef 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -451,7 +451,7 @@ static int enetc_refill_rx_ring(struct enetc_bdr *rx_ring, const int buff_cnt)
 
 	i = rx_ring->next_to_use;
 	rx_swbd = &rx_ring->rx_swbd[i];
-	rxbd = ENETC_RXBD(*rx_ring, i);
+	rxbd = enetc_rxbd(rx_ring, i);
 
 	for (j = 0; j < buff_cnt; j++) {
 		/* try reuse page */
@@ -468,13 +468,12 @@ static int enetc_refill_rx_ring(struct enetc_bdr *rx_ring, const int buff_cnt)
 		/* clear 'R" as well */
 		rxbd->r.lstatus = 0;
 
+		rxbd = enetc_rxbd_next(rx_ring, rxbd, i);
 		rx_swbd++;
-		rxbd++;
 		i++;
 		if (unlikely(i == rx_ring->bd_count)) {
 			i = 0;
 			rx_swbd = rx_ring->rx_swbd;
-			rxbd = ENETC_RXBD(*rx_ring, 0);
 		}
 	}
 
@@ -655,7 +654,7 @@ static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 			cleaned_cnt -= count;
 		}
 
-		rxbd = ENETC_RXBD(*rx_ring, i);
+		rxbd = enetc_rxbd(rx_ring, i);
 		bd_status = le32_to_cpu(rxbd->r.lstatus);
 		if (!bd_status)
 			break;
@@ -670,12 +669,10 @@ static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 		enetc_get_offloads(rx_ring, rxbd, skb);
 
 		cleaned_cnt++;
-		rxbd++;
-		i++;
-		if (unlikely(i == rx_ring->bd_count)) {
+
+		rxbd = enetc_rxbd_next(rx_ring, rxbd, i);
+		if (unlikely(++i == rx_ring->bd_count))
 			i = 0;
-			rxbd = ENETC_RXBD(*rx_ring, 0);
-		}
 
 		if (unlikely(bd_status &
 			     ENETC_RXBD_LSTATUS(ENETC_RXBD_ERR_MASK))) {
@@ -683,12 +680,10 @@ static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 			while (!(bd_status & ENETC_RXBD_LSTATUS_F)) {
 				dma_rmb();
 				bd_status = le32_to_cpu(rxbd->r.lstatus);
-				rxbd++;
-				i++;
-				if (unlikely(i == rx_ring->bd_count)) {
+
+				rxbd = enetc_rxbd_next(rx_ring, rxbd, i);
+				if (unlikely(++i == rx_ring->bd_count))
 					i = 0;
-					rxbd = ENETC_RXBD(*rx_ring, 0);
-				}
 			}
 
 			rx_ring->ndev->stats.rx_dropped++;
@@ -710,12 +705,10 @@ static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 			enetc_add_rx_buff_to_skb(rx_ring, i, size, skb);
 
 			cleaned_cnt++;
-			rxbd++;
-			i++;
-			if (unlikely(i == rx_ring->bd_count)) {
+
+			rxbd = enetc_rxbd_next(rx_ring, rxbd, i);
+			if (unlikely(++i == rx_ring->bd_count))
 				i = 0;
-				rxbd = ENETC_RXBD(*rx_ring, 0);
-			}
 		}
 
 		rx_byte_cnt += skb->len;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index 9938f7a..1cd4cdd 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -104,7 +104,22 @@ struct enetc_cbdr {
 };
 
 #define ENETC_TXBD(BDR, i) (&(((union enetc_tx_bd *)((BDR).bd_base))[i]))
-#define ENETC_RXBD(BDR, i) (&(((union enetc_rx_bd *)((BDR).bd_base))[i]))
+
+static inline union enetc_rx_bd *enetc_rxbd(struct enetc_bdr *rx_ring, int i)
+{
+	return &(((union enetc_rx_bd *)rx_ring->bd_base)[i]);
+}
+
+static inline union enetc_rx_bd *enetc_rxbd_next(struct enetc_bdr *rx_ring,
+						 union enetc_rx_bd *rxbd,
+						 int i)
+{
+	rxbd++;
+	if (unlikely(++i == rx_ring->bd_count))
+		rxbd = rx_ring->bd_base;
+
+	return rxbd;
+}
 
 struct enetc_msg_swbd {
 	void *vaddr;