GRETH: resolve SMP issues and other problems

Fixes the following:
1. POLL should not enable IRQ when work is not completed
2. No locking between TX descriptor cleaning and XMIT descriptor handling
3. No locking between RX POLL and XMIT modifying control register
4. Since TX cleaning (called from POLL) is running in parallel with XMIT
   unnecessary locking is needed.
5. IRQ handler looks at RX frame status solely, this is wrong when IRQ is
   temporarily disabled (in POLL), and when IRQ is shared.
6. IRQ handler clears IRQ status, which is unnecessary
7. TX queue was stopped in preventing cause when not MAX_SKB_FRAGS+1
   descriptors were available after a SKB been scheduled by XMIT. Instead
   the TX queue is stopped first when not enough descriptors are available
   upon entering XMIT.

It was hard to split up this patch in smaller pieces since all are tied
together somehow.

Note the RX flag used in the interrupt handler does not signal that
interrupt was asserted, but that a frame was received. Same goes for TX.
Also, IRQ is not asserted when the RX flag is set before enabling IRQ
enable until a new frame is received. So extra care must be taken to
avoid enabling IRQ and all descriptors are already used, hence dead lock
will upon us. See new POLL implementation that enableds IRQ then look at
the RX flag to determine if one or more IRQs may have been missed. TX/RX
flags are cleared before handling previously enabled descriptors, this
ensures that the RX/TX flags are valid when determining if IRQ should be
turned on again.

By moving TX cleaning from POLL to XMIT in the standard case, removes some
locking trouble. Enabling TX cleaning from poll only when not enough TX
descriptors are available is safe because the TX queue is at the same time
stopped, thus XMIT will not be called. The TX queue is woken up again when
enough descriptrs are available.

TX Frames are always enabled with IRQ, however the TX IRQ Enable flag will
not be enabled until XMIT must wait for free descriptors.

Locking RX and XMIT parts of the driver from each other is needed because
the RX/TX enable bits share the same register.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/greth.c

@@ -1,7 +1,7 @@
 /*
  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
  *
- * 2005-2009 (c) Aeroflex Gaisler AB
+ * 2005-2010 (c) Aeroflex Gaisler AB
  *
  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
  * available in the GRLIB VHDL IP core library.
@@ -392,12 +392,20 @@ greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct greth_private *greth = netdev_priv(dev);
 	struct greth_bd *bdp;
 	int err = NETDEV_TX_OK;
-	u32 status, dma_addr;
+	u32 status, dma_addr, ctrl;
+	unsigned long flags;
 
-	bdp = greth->tx_bd_base + greth->tx_next;
+	/* Clean TX Ring */
+	greth_clean_tx(greth->netdev);
 
 	if (unlikely(greth->tx_free <= 0)) {
+		spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
+		ctrl = GRETH_REGLOAD(greth->regs->control);
+		/* Enable TX IRQ only if not already in poll() routine */
+		if (ctrl & GRETH_RXI)
+			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 		netif_stop_queue(dev);
+		spin_unlock_irqrestore(&greth->devlock, flags);
 		return NETDEV_TX_BUSY;
 	}
 
@@ -410,13 +418,14 @@ greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		goto out;
 	}
 
+	bdp = greth->tx_bd_base + greth->tx_next;
 	dma_addr = greth_read_bd(&bdp->addr);
 
 	memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 
 	dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 
-	status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
+	status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 
 	/* Wrap around descriptor ring */
 	if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
@@ -426,22 +435,11 @@ greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	greth->tx_next = NEXT_TX(greth->tx_next);
 	greth->tx_free--;
 
-	/* No more descriptors */
-	if (unlikely(greth->tx_free == 0)) {
-
-		/* Free transmitted descriptors */
-		greth_clean_tx(dev);
-
-		/* If nothing was cleaned, stop queue & wait for irq */
-		if (unlikely(greth->tx_free == 0)) {
-			status |= GRETH_BD_IE;
-			netif_stop_queue(dev);
-		}
-	}
-
 	/* Write descriptor control word and enable transmission */
 	greth_write_bd(&bdp->stat, status);
+	spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 	greth_enable_tx(greth);
+	spin_unlock_irqrestore(&greth->devlock, flags);
 
 out:
 	dev_kfree_skb(skb);
@@ -454,13 +452,23 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct greth_private *greth = netdev_priv(dev);
 	struct greth_bd *bdp;
-	u32 status = 0, dma_addr;
+	u32 status = 0, dma_addr, ctrl;
 	int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
+	unsigned long flags;
 
 	nr_frags = skb_shinfo(skb)->nr_frags;
 
+	/* Clean TX Ring */
+	greth_clean_tx_gbit(dev);
+
 	if (greth->tx_free < nr_frags + 1) {
+		spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
+		ctrl = GRETH_REGLOAD(greth->regs->control);
+		/* Enable TX IRQ only if not already in poll() routine */
+		if (ctrl & GRETH_RXI)
+			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 		netif_stop_queue(dev);
+		spin_unlock_irqrestore(&greth->devlock, flags);
 		err = NETDEV_TX_BUSY;
 		goto out;
 	}
@@ -513,14 +521,8 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 		/* More fragments left */
 		if (i < nr_frags - 1)
 			status |= GRETH_TXBD_MORE;
-
-		/* ... last fragment, check if out of descriptors  */
-		else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
-
-			/* Enable interrupts and stop queue */
-			status |= GRETH_BD_IE;
-			netif_stop_queue(dev);
-		}
+		else
+			status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 
 		greth_write_bd(&bdp->stat, status);
 
@@ -548,7 +550,9 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 
 	wmb();
 
+	spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 	greth_enable_tx(greth);
+	spin_unlock_irqrestore(&greth->devlock, flags);
 
 	return NETDEV_TX_OK;
 
@@ -570,12 +574,11 @@ out:
 	return err;
 }
 
-
 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 {
 	struct net_device *dev = dev_id;
 	struct greth_private *greth;
-	u32 status;
+	u32 status, ctrl;
 	irqreturn_t retval = IRQ_NONE;
 
 	greth = netdev_priv(dev);
@@ -585,14 +588,15 @@ static irqreturn_t greth_interrupt(int irq, void *dev_id)
 	/* Get the interrupt events that caused us to be here. */
 	status = GRETH_REGLOAD(greth->regs->status);
 
-	/* Handle rx and tx interrupts through poll */
-	if (status & (GRETH_INT_RE | GRETH_INT_RX |
-		      GRETH_INT_TE | GRETH_INT_TX)) {
+	/* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
+	 * set regardless of whether IRQ is enabled or not. Especially
+	 * important when shared IRQ.
+	 */
+	ctrl = GRETH_REGLOAD(greth->regs->control);
 
-		/* Clear interrupt status */
-		GRETH_REGSAVE(greth->regs->status,
-			      status & (GRETH_INT_RE | GRETH_INT_RX |
-					GRETH_INT_TE | GRETH_INT_TX));
+	/* Handle rx and tx interrupts through poll */
+	if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
+	    ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 		retval = IRQ_HANDLED;
 
 		/* Disable interrupts and schedule poll() */
@@ -616,6 +620,8 @@ static void greth_clean_tx(struct net_device *dev)
 
 	while (1) {
 		bdp = greth->tx_bd_base + greth->tx_last;
+		GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
+		mb();
 		stat = greth_read_bd(&bdp->stat);
 
 		if (unlikely(stat & GRETH_BD_EN))
@@ -676,7 +682,10 @@ static void greth_clean_tx_gbit(struct net_device *dev)
 
 		/* We only clean fully completed SKBs */
 		bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
-		stat = bdp_last_frag->stat;
+
+		GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
+		mb();
+		stat = greth_read_bd(&bdp_last_frag->stat);
 
 		if (stat & GRETH_BD_EN)
 			break;
@@ -708,21 +717,9 @@ static void greth_clean_tx_gbit(struct net_device *dev)
 		greth->tx_free += nr_frags+1;
 		dev_kfree_skb(skb);
 	}
-	if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
-		netif_wake_queue(dev);
-	}
-}
 
-static int greth_pending_packets(struct greth_private *greth)
-{
-	struct greth_bd *bdp;
-	u32 status;
-	bdp = greth->rx_bd_base + greth->rx_cur;
-	status = greth_read_bd(&bdp->stat);
-	if (status & GRETH_BD_EN)
-		return 0;
-	else
-		return 1;
+	if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
+		netif_wake_queue(dev);
 }
 
 static int greth_rx(struct net_device *dev, int limit)
@@ -733,20 +730,24 @@ static int greth_rx(struct net_device *dev, int limit)
 	int pkt_len;
 	int bad, count;
 	u32 status, dma_addr;
+	unsigned long flags;
 
 	greth = netdev_priv(dev);
 
 	for (count = 0; count < limit; ++count) {
 
 		bdp = greth->rx_bd_base + greth->rx_cur;
+		GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
+		mb();
 		status = greth_read_bd(&bdp->stat);
-		dma_addr = greth_read_bd(&bdp->addr);
-		bad = 0;
 
 		if (unlikely(status & GRETH_BD_EN)) {
 			break;
 		}
 
+		dma_addr = greth_read_bd(&bdp->addr);
+		bad = 0;
+
 		/* Check status for errors. */
 		if (unlikely(status & GRETH_RXBD_STATUS)) {
 			if (status & GRETH_RXBD_ERR_FT) {
@@ -808,7 +809,9 @@ static int greth_rx(struct net_device *dev, int limit)
 
 		dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 
+		spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 		greth_enable_rx(greth);
+		spin_unlock_irqrestore(&greth->devlock, flags);
 
 		greth->rx_cur = NEXT_RX(greth->rx_cur);
 	}
@@ -842,6 +845,7 @@ static int greth_rx_gbit(struct net_device *dev, int limit)
 	int pkt_len;
 	int bad, count = 0;
 	u32 status, dma_addr;
+	unsigned long flags;
 
 	greth = netdev_priv(dev);
 
@@ -849,6 +853,8 @@ static int greth_rx_gbit(struct net_device *dev, int limit)
 
 		bdp = greth->rx_bd_base + greth->rx_cur;
 		skb = greth->rx_skbuff[greth->rx_cur];
+		GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
+		mb();
 		status = greth_read_bd(&bdp->stat);
 		bad = 0;
 
@@ -936,7 +942,9 @@ static int greth_rx_gbit(struct net_device *dev, int limit)
 
 		wmb();
 		greth_write_bd(&bdp->stat, status);
+		spin_lock_irqsave(&greth->devlock, flags);
 		greth_enable_rx(greth);
+		spin_unlock_irqrestore(&greth->devlock, flags);
 		greth->rx_cur = NEXT_RX(greth->rx_cur);
 	}
 
@@ -948,15 +956,18 @@ static int greth_poll(struct napi_struct *napi, int budget)
 {
 	struct greth_private *greth;
 	int work_done = 0;
+	unsigned long flags;
+	u32 mask, ctrl;
 	greth = container_of(napi, struct greth_private, napi);
 
-	if (greth->gbit_mac) {
-		greth_clean_tx_gbit(greth->netdev);
-	} else {
-		greth_clean_tx(greth->netdev);
+restart_txrx_poll:
+	if (netif_queue_stopped(greth->netdev)) {
+		if (greth->gbit_mac)
+			greth_clean_tx_gbit(greth->netdev);
+		else
+			greth_clean_tx(greth->netdev);
 	}
 
-restart_poll:
 	if (greth->gbit_mac) {
 		work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 	} else {
@@ -965,15 +976,29 @@ restart_poll:
 
 	if (work_done < budget) {
 
-		napi_complete(napi);
+		spin_lock_irqsave(&greth->devlock, flags);
 
-		if (greth_pending_packets(greth)) {
-			napi_reschedule(napi);
-			goto restart_poll;
+		ctrl = GRETH_REGLOAD(greth->regs->control);
+		if (netif_queue_stopped(greth->netdev)) {
+			GRETH_REGSAVE(greth->regs->control,
+					ctrl | GRETH_TXI | GRETH_RXI);
+			mask = GRETH_INT_RX | GRETH_INT_RE |
+			       GRETH_INT_TX | GRETH_INT_TE;
+		} else {
+			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
+			mask = GRETH_INT_RX | GRETH_INT_RE;
+		}
+
+		if (GRETH_REGLOAD(greth->regs->status) & mask) {
+			GRETH_REGSAVE(greth->regs->control, ctrl);
+			spin_unlock_irqrestore(&greth->devlock, flags);
+			goto restart_txrx_poll;
+		} else {
+			__napi_complete(napi);
+			spin_unlock_irqrestore(&greth->devlock, flags);
 		}
 	}
 
-	greth_enable_irqs(greth);
 	return work_done;
 }
 
@@ -1168,11 +1193,11 @@ static const struct ethtool_ops greth_ethtool_ops = {
 };
 
 static struct net_device_ops greth_netdev_ops = {
-	.ndo_open = greth_open,
-	.ndo_stop = greth_close,
-	.ndo_start_xmit = greth_start_xmit,
-	.ndo_set_mac_address = greth_set_mac_add,
-	.ndo_validate_addr 	= eth_validate_addr,
+	.ndo_open		= greth_open,
+	.ndo_stop		= greth_close,
+	.ndo_start_xmit		= greth_start_xmit,
+	.ndo_set_mac_address	= greth_set_mac_add,
+	.ndo_validate_addr	= eth_validate_addr,
 };
 
 static inline int wait_for_mdio(struct greth_private *greth)