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authorDavid S. Miller <davem@davemloft.net>2014-09-23 18:09:27 +0200
committerDavid S. Miller <davem@davemloft.net>2014-09-23 18:09:27 +0200
commit1f6d80358dc9bbbeb56cb43384fa11fd645d9289 (patch)
tree152bfa5165292a8e4f06d536b6d222a68480e573 /drivers/net/ethernet/arc
parentnet: sched: fix compile warning in cls_u32 (diff)
parentMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff)
downloadlinux-1f6d80358dc9bbbeb56cb43384fa11fd645d9289.tar.xz
linux-1f6d80358dc9bbbeb56cb43384fa11fd645d9289.zip
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts: arch/mips/net/bpf_jit.c drivers/net/can/flexcan.c Both the flexcan and MIPS bpf_jit conflicts were cases of simple overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/arc')
-rw-r--r--drivers/net/ethernet/arc/emac_main.c53
1 files changed, 37 insertions, 16 deletions
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index dbea8472bfb4..abe1eabc0171 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -28,6 +28,17 @@
/**
+ * arc_emac_tx_avail - Return the number of available slots in the tx ring.
+ * @priv: Pointer to ARC EMAC private data structure.
+ *
+ * returns: the number of slots available for transmission in tx the ring.
+ */
+static inline int arc_emac_tx_avail(struct arc_emac_priv *priv)
+{
+ return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM;
+}
+
+/**
* arc_emac_adjust_link - Adjust the PHY link duplex.
* @ndev: Pointer to the net_device structure.
*
@@ -182,10 +193,15 @@ static void arc_emac_tx_clean(struct net_device *ndev)
txbd->info = 0;
*txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
-
- if (netif_queue_stopped(ndev))
- netif_wake_queue(ndev);
}
+
+ /* Ensure that txbd_dirty is visible to tx() before checking
+ * for queue stopped.
+ */
+ smp_mb();
+
+ if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv))
+ netif_wake_queue(ndev);
}
/**
@@ -300,7 +316,7 @@ static int arc_emac_poll(struct napi_struct *napi, int budget)
work_done = arc_emac_rx(ndev, budget);
if (work_done < budget) {
napi_complete(napi);
- arc_reg_or(priv, R_ENABLE, RXINT_MASK);
+ arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
}
return work_done;
@@ -329,9 +345,9 @@ static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
/* Reset all flags except "MDIO complete" */
arc_reg_set(priv, R_STATUS, status);
- if (status & RXINT_MASK) {
+ if (status & (RXINT_MASK | TXINT_MASK)) {
if (likely(napi_schedule_prep(&priv->napi))) {
- arc_reg_clr(priv, R_ENABLE, RXINT_MASK);
+ arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
__napi_schedule(&priv->napi);
}
}
@@ -442,7 +458,7 @@ static int arc_emac_open(struct net_device *ndev)
arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
/* Enable interrupts */
- arc_reg_set(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
+ arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
/* Set CONTROL */
arc_reg_set(priv, R_CTRL,
@@ -513,7 +529,7 @@ static int arc_emac_stop(struct net_device *ndev)
netif_stop_queue(ndev);
/* Disable interrupts */
- arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
+ arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
/* Disable EMAC */
arc_reg_clr(priv, R_CTRL, EN_MASK);
@@ -576,11 +592,9 @@ static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
len = max_t(unsigned int, ETH_ZLEN, skb->len);
- /* EMAC still holds this buffer in its possession.
- * CPU must not modify this buffer descriptor
- */
- if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) {
+ if (unlikely(!arc_emac_tx_avail(priv))) {
netif_stop_queue(ndev);
+ netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n");
return NETDEV_TX_BUSY;
}
@@ -609,12 +623,19 @@ static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
/* Increment index to point to the next BD */
*txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
- /* Get "info" of the next BD */
- info = &priv->txbd[*txbd_curr].info;
+ /* Ensure that tx_clean() sees the new txbd_curr before
+ * checking the queue status. This prevents an unneeded wake
+ * of the queue in tx_clean().
+ */
+ smp_mb();
- /* Check if if Tx BD ring is full - next BD is still owned by EMAC */
- if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC))
+ if (!arc_emac_tx_avail(priv)) {
netif_stop_queue(ndev);
+ /* Refresh tx_dirty */
+ smp_mb();
+ if (arc_emac_tx_avail(priv))
+ netif_start_queue(ndev);
+ }
arc_reg_set(priv, R_STATUS, TXPL_MASK);