[PATCH 1/2] net: fs_enet: Remove non NAPI RX

[Christophe Leroy]

In the probe function, use_napi is inconditionnaly set to 1. This patch removes
all the code which is conditional to !use_napi, and removes use_napi which has
then become useless.

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>

---
 .../net/ethernet/freescale/fs_enet/fs_enet-main.c  | 164 ++-------------------
 include/linux/fs_enet_pd.h                         |   1 -
 2 files changed, 15 insertions(+), 150 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
index 748fd24..71a25b4 100644
--- a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
+++ b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
@@ -215,128 +215,6 @@ static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
 	return received;
 }
 
-/* non NAPI receive function */
-static int fs_enet_rx_non_napi(struct net_device *dev)
-{
-	struct fs_enet_private *fep = netdev_priv(dev);
-	const struct fs_platform_info *fpi = fep->fpi;
-	cbd_t __iomem *bdp;
-	struct sk_buff *skb, *skbn, *skbt;
-	int received = 0;
-	u16 pkt_len, sc;
-	int curidx;
-	/*
-	 * First, grab all of the stats for the incoming packet.
-	 * These get messed up if we get called due to a busy condition.
-	 */
-	bdp = fep->cur_rx;
-
-	while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
-
-		curidx = bdp - fep->rx_bd_base;
-
-		/*
-		 * Since we have allocated space to hold a complete frame,
-		 * the last indicator should be set.
-		 */
-		if ((sc & BD_ENET_RX_LAST) == 0)
-			dev_warn(fep->dev, "rcv is not +last\n");
-
-		/*
-		 * Check for errors.
-		 */
-		if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
-			  BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
-			fep->stats.rx_errors++;
-			/* Frame too long or too short. */
-			if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
-				fep->stats.rx_length_errors++;
-			/* Frame alignment */
-			if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
-				fep->stats.rx_frame_errors++;
-			/* CRC Error */
-			if (sc & BD_ENET_RX_CR)
-				fep->stats.rx_crc_errors++;
-			/* FIFO overrun */
-			if (sc & BD_ENET_RX_OV)
-				fep->stats.rx_crc_errors++;
-
-			skb = fep->rx_skbuff[curidx];
-
-			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
-				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
-				DMA_FROM_DEVICE);
-
-			skbn = skb;
-
-		} else {
-
-			skb = fep->rx_skbuff[curidx];
-
-			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
-				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
-				DMA_FROM_DEVICE);
-
-			/*
-			 * Process the incoming frame.
-			 */
-			fep->stats.rx_packets++;
-			pkt_len = CBDR_DATLEN(bdp) - 4;	/* remove CRC */
-			fep->stats.rx_bytes += pkt_len + 4;
-
-			if (pkt_len <= fpi->rx_copybreak) {
-				/* +2 to make IP header L1 cache aligned */
-				skbn = netdev_alloc_skb(dev, pkt_len + 2);
-				if (skbn != NULL) {
-					skb_reserve(skbn, 2);	/* align IP header */
-					skb_copy_from_linear_data(skb,
-						      skbn->data, pkt_len);
-					/* swap */
-					skbt = skb;
-					skb = skbn;
-					skbn = skbt;
-				}
-			} else {
-				skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
-
-				if (skbn)
-					skb_align(skbn, ENET_RX_ALIGN);
-			}
-
-			if (skbn != NULL) {
-				skb_put(skb, pkt_len);	/* Make room */
-				skb->protocol = eth_type_trans(skb, dev);
-				received++;
-				netif_rx(skb);
-			} else {
-				fep->stats.rx_dropped++;
-				skbn = skb;
-			}
-		}
-
-		fep->rx_skbuff[curidx] = skbn;
-		CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
-			     L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
-			     DMA_FROM_DEVICE));
-		CBDW_DATLEN(bdp, 0);
-		CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
-
-		/*
-		 * Update BD pointer to next entry.
-		 */
-		if ((sc & BD_ENET_RX_WRAP) == 0)
-			bdp++;
-		else
-			bdp = fep->rx_bd_base;
-
-		(*fep->ops->rx_bd_done)(dev);
-	}
-
-	fep->cur_rx = bdp;
-
-	return 0;
-}
-
 static void fs_enet_tx(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
@@ -453,8 +331,7 @@ fs_enet_interrupt(int irq, void *dev_id)
 		nr++;
 
 		int_clr_events = int_events;
-		if (fpi->use_napi)
-			int_clr_events &= ~fep->ev_napi_rx;
+		int_clr_events &= ~fep->ev_napi_rx;
 
 		(*fep->ops->clear_int_events)(dev, int_clr_events);
 
@@ -462,19 +339,15 @@ fs_enet_interrupt(int irq, void *dev_id)
 			(*fep->ops->ev_error)(dev, int_events);
 
 		if (int_events & fep->ev_rx) {
-			if (!fpi->use_napi)
-				fs_enet_rx_non_napi(dev);
-			else {
-				napi_ok = napi_schedule_prep(&fep->napi);
-
-				(*fep->ops->napi_disable_rx)(dev);
-				(*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
-
-				/* NOTE: it is possible for FCCs in NAPI mode    */
-				/* to submit a spurious interrupt while in poll  */
-				if (napi_ok)
-					__napi_schedule(&fep->napi);
-			}
+			napi_ok = napi_schedule_prep(&fep->napi);
+
+			(*fep->ops->napi_disable_rx)(dev);
+			(*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
+
+			/* NOTE: it is possible for FCCs in NAPI mode    */
+			/* to submit a spurious interrupt while in poll  */
+			if (napi_ok)
+				__napi_schedule(&fep->napi);
 		}
 
 		if (int_events & fep->ev_tx)
@@ -811,24 +684,21 @@ static int fs_enet_open(struct net_device *dev)
 	/* not doing this, will cause a crash in fs_enet_rx_napi */
 	fs_init_bds(fep->ndev);
 
-	if (fep->fpi->use_napi)
-		napi_enable(&fep->napi);
+	napi_enable(&fep->napi);
 
 	/* Install our interrupt handler. */
 	r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
 			"fs_enet-mac", dev);
 	if (r != 0) {
 		dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
-		if (fep->fpi->use_napi)
-			napi_disable(&fep->napi);
+		napi_disable(&fep->napi);
 		return -EINVAL;
 	}
 
 	err = fs_init_phy(dev);
 	if (err) {
 		free_irq(fep->interrupt, dev);
-		if (fep->fpi->use_napi)
-			napi_disable(&fep->napi);
+		napi_disable(&fep->napi);
 		return err;
 	}
 	phy_start(fep->phydev);
@@ -845,8 +715,7 @@ static int fs_enet_close(struct net_device *dev)
 
 	netif_stop_queue(dev);
 	netif_carrier_off(dev);
-	if (fep->fpi->use_napi)
-		napi_disable(&fep->napi);
+	napi_disable(&fep->napi);
 	phy_stop(fep->phydev);
 
 	spin_lock_irqsave(&fep->lock, flags);
@@ -1022,7 +891,6 @@ static int fs_enet_probe(struct platform_device *ofdev)
 	fpi->rx_ring = 32;
 	fpi->tx_ring = 32;
 	fpi->rx_copybreak = 240;
-	fpi->use_napi = 1;
 	fpi->napi_weight = 17;
 	fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
 	if (!fpi->phy_node && of_phy_is_fixed_link(ofdev->dev.of_node)) {
@@ -1102,9 +970,7 @@ static int fs_enet_probe(struct platform_device *ofdev)
 
 	ndev->netdev_ops = &fs_enet_netdev_ops;
 	ndev->watchdog_timeo = 2 * HZ;
-	if (fpi->use_napi)
-		netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
-		               fpi->napi_weight);
+	netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi, fpi->napi_weight);
 
 	ndev->ethtool_ops = &fs_ethtool_ops;
 
diff --git a/include/linux/fs_enet_pd.h b/include/linux/fs_enet_pd.h
index efb0596..77d783f 100644
--- a/include/linux/fs_enet_pd.h
+++ b/include/linux/fs_enet_pd.h
@@ -139,7 +139,6 @@ struct fs_platform_info {
 	int rx_ring, tx_ring;	/* number of buffers on rx     */
 	__u8 macaddr[ETH_ALEN];	/* mac address                 */
 	int rx_copybreak;	/* limit we copy small frames  */
-	int use_napi;		/* use NAPI                    */
 	int napi_weight;	/* NAPI weight                 */
 
 	int use_rmii;		/* use RMII mode 	       */
-- 
2.1.0

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