netdev - [PATCH net-next V3 09/16] net: fec: eliminate calls to fec_enet_get

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Date:	Tue,  5 Apr 2016 19:25:55 -0700
From:	Troy Kisky <troy.kisky@...ndarydevices.com>
To:	netdev@...r.kernel.org, davem@...emloft.net, fugang.duan@....com,
	lznuaa@...il.com
Cc:	fabio.estevam@....com, l.stach@...gutronix.de, andrew@...n.ch,
	tremyfr@...il.com, gerg@...inux.org,
	linux-arm-kernel@...ts.infradead.org, johannes@...solutions.net,
	stillcompiling@...il.com, sergei.shtylyov@...entembedded.com,
	arnd@...db.de, Troy Kisky <troy.kisky@...ndarydevices.com>
Subject: [PATCH net-next V3 09/16] net: fec: eliminate calls to fec_enet_get_prevdesc

Eliminating calls to fec_enet_get_prevdesc shrinks
the code a little.

Signed-off-by: Troy Kisky <troy.kisky@...ndarydevices.com>

---
v3: Change commit message

s/unsigned status/unsigned int status/ as requested
---
 drivers/net/ethernet/freescale/fec_main.c | 37 +++++++++----------------------
 1 file changed, 11 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 21d2cd0..349fda1 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -758,6 +758,7 @@ static void fec_enet_bd_init(struct net_device *dev)
 	struct bufdesc *bdp;
 	unsigned int i;
 	unsigned int q;
+	unsigned int status;
 
 	for (q = 0; q < fep->num_rx_queues; q++) {
 		/* Initialize the receive buffer descriptors. */
@@ -765,19 +766,13 @@ static void fec_enet_bd_init(struct net_device *dev)
 		bdp = rxq->bd.base;
 
 		for (i = 0; i < rxq->bd.ring_size; i++) {
-
 			/* Initialize the BD for every fragment in the page. */
-			if (bdp->cbd_bufaddr)
-				bdp->cbd_sc = cpu_to_fec16(BD_ENET_RX_EMPTY);
-			else
-				bdp->cbd_sc = cpu_to_fec16(0);
+			status = bdp->cbd_bufaddr ? BD_ENET_RX_EMPTY : 0;
+			if (bdp == rxq->bd.last)
+				status |= BD_SC_WRAP;
+			bdp->cbd_sc = cpu_to_fec16(status);
 			bdp = fec_enet_get_nextdesc(bdp, &rxq->bd);
 		}
-
-		/* Set the last buffer to wrap */
-		bdp = fec_enet_get_prevdesc(bdp, &rxq->bd);
-		bdp->cbd_sc |= cpu_to_fec16(BD_SC_WRAP);
-
 		rxq->bd.cur = rxq->bd.base;
 	}
 
@@ -789,18 +784,16 @@ static void fec_enet_bd_init(struct net_device *dev)
 
 		for (i = 0; i < txq->bd.ring_size; i++) {
 			/* Initialize the BD for every fragment in the page. */
-			bdp->cbd_sc = cpu_to_fec16(0);
 			if (txq->tx_skbuff[i]) {
 				dev_kfree_skb_any(txq->tx_skbuff[i]);
 				txq->tx_skbuff[i] = NULL;
 			}
 			bdp->cbd_bufaddr = cpu_to_fec32(0);
+			bdp->cbd_sc = cpu_to_fec16((bdp == txq->bd.last) ?
+					BD_SC_WRAP : 0);
 			bdp = fec_enet_get_nextdesc(bdp, &txq->bd);
 		}
-
-		/* Set the last buffer to wrap */
 		bdp = fec_enet_get_prevdesc(bdp, &txq->bd);
-		bdp->cbd_sc |= cpu_to_fec16(BD_SC_WRAP);
 		txq->dirty_tx = bdp;
 	}
 }
@@ -2717,19 +2710,16 @@ fec_enet_alloc_rxq_buffers(struct net_device *ndev, unsigned int queue)
 		}
 
 		rxq->rx_skbuff[i] = skb;
-		bdp->cbd_sc = cpu_to_fec16(BD_ENET_RX_EMPTY);
 
 		if (fep->bufdesc_ex) {
 			struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
 			ebdp->cbd_esc = cpu_to_fec32(BD_ENET_RX_INT);
 		}
+		bdp->cbd_sc = cpu_to_fec16(BD_ENET_RX_EMPTY |
+				((bdp == rxq->bd.last) ? BD_SC_WRAP : 0));
 
 		bdp = fec_enet_get_nextdesc(bdp, &rxq->bd);
 	}
-
-	/* Set the last buffer to wrap. */
-	bdp = fec_enet_get_prevdesc(bdp, &rxq->bd);
-	bdp->cbd_sc |= cpu_to_fec16(BD_SC_WRAP);
 	return 0;
 
  err_alloc:
@@ -2752,21 +2742,16 @@ fec_enet_alloc_txq_buffers(struct net_device *ndev, unsigned int queue)
 		if (!txq->tx_bounce[i])
 			goto err_alloc;
 
-		bdp->cbd_sc = cpu_to_fec16(0);
 		bdp->cbd_bufaddr = cpu_to_fec32(0);
 
 		if (fep->bufdesc_ex) {
 			struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
 			ebdp->cbd_esc = cpu_to_fec32(BD_ENET_TX_INT);
 		}
-
+		bdp->cbd_sc = cpu_to_fec16((bdp == txq->bd.last) ?
+				BD_SC_WRAP : 0);
 		bdp = fec_enet_get_nextdesc(bdp, &txq->bd);
 	}
-
-	/* Set the last buffer to wrap. */
-	bdp = fec_enet_get_prevdesc(bdp, &txq->bd);
-	bdp->cbd_sc |= cpu_to_fec16(BD_SC_WRAP);
-
 	return 0;
 
  err_alloc:
-- 
2.5.0