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Subject[PATCH 5.4 087/104] net/sonic: Add mutual exclusion for accessing shared state
Date
From: Finn Thain <fthain@telegraphics.com.au>

commit 865ad2f2201dc18685ba2686f13217f8b3a9c52c upstream.

The netif_stop_queue() call in sonic_send_packet() races with the
netif_wake_queue() call in sonic_interrupt(). This causes issues
like "NETDEV WATCHDOG: eth0 (macsonic): transmit queue 0 timed out".
Fix this by disabling interrupts when accessing tx_skb[] and next_tx.
Update a comment to clarify the synchronization properties.

Fixes: efcce839360f ("[PATCH] macsonic/jazzsonic network drivers update")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/ethernet/natsemi/sonic.c | 49 +++++++++++++++++++++++++----------
drivers/net/ethernet/natsemi/sonic.h | 1
2 files changed, 36 insertions(+), 14 deletions(-)

--- a/drivers/net/ethernet/natsemi/sonic.c
+++ b/drivers/net/ethernet/natsemi/sonic.c
@@ -64,6 +64,8 @@ static int sonic_open(struct net_device

netif_dbg(lp, ifup, dev, "%s: initializing sonic driver\n", __func__);

+ spin_lock_init(&lp->lock);
+
for (i = 0; i < SONIC_NUM_RRS; i++) {
struct sk_buff *skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
if (skb == NULL) {
@@ -206,8 +208,6 @@ static void sonic_tx_timeout(struct net_
* wake the tx queue
* Concurrently with all of this, the SONIC is potentially writing to
* the status flags of the TDs.
- * Until some mutual exclusion is added, this code will not work with SMP. However,
- * MIPS Jazz machines and m68k Macs were all uni-processor machines.
*/

static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
@@ -215,7 +215,8 @@ static int sonic_send_packet(struct sk_b
struct sonic_local *lp = netdev_priv(dev);
dma_addr_t laddr;
int length;
- int entry = lp->next_tx;
+ int entry;
+ unsigned long flags;

netif_dbg(lp, tx_queued, dev, "%s: skb=%p\n", __func__, skb);

@@ -237,6 +238,10 @@ static int sonic_send_packet(struct sk_b
return NETDEV_TX_OK;
}

+ spin_lock_irqsave(&lp->lock, flags);
+
+ entry = lp->next_tx;
+
sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0); /* clear status */
sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1); /* single fragment */
sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
@@ -246,10 +251,6 @@ static int sonic_send_packet(struct sk_b
sonic_tda_put(dev, entry, SONIC_TD_LINK,
sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);

- /*
- * Must set tx_skb[entry] only after clearing status, and
- * before clearing EOL and before stopping queue
- */
wmb();
lp->tx_len[entry] = length;
lp->tx_laddr[entry] = laddr;
@@ -272,6 +273,8 @@ static int sonic_send_packet(struct sk_b

SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);

+ spin_unlock_irqrestore(&lp->lock, flags);
+
return NETDEV_TX_OK;
}

@@ -284,9 +287,21 @@ static irqreturn_t sonic_interrupt(int i
struct net_device *dev = dev_id;
struct sonic_local *lp = netdev_priv(dev);
int status;
+ unsigned long flags;
+
+ /* The lock has two purposes. Firstly, it synchronizes sonic_interrupt()
+ * with sonic_send_packet() so that the two functions can share state.
+ * Secondly, it makes sonic_interrupt() re-entrant, as that is required
+ * by macsonic which must use two IRQs with different priority levels.
+ */
+ spin_lock_irqsave(&lp->lock, flags);
+
+ status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT;
+ if (!status) {
+ spin_unlock_irqrestore(&lp->lock, flags);

- if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
return IRQ_NONE;
+ }

do {
if (status & SONIC_INT_PKTRX) {
@@ -300,11 +315,12 @@ static irqreturn_t sonic_interrupt(int i
int td_status;
int freed_some = 0;

- /* At this point, cur_tx is the index of a TD that is one of:
- * unallocated/freed (status set & tx_skb[entry] clear)
- * allocated and sent (status set & tx_skb[entry] set )
- * allocated and not yet sent (status clear & tx_skb[entry] set )
- * still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
+ /* The state of a Transmit Descriptor may be inferred
+ * from { tx_skb[entry], td_status } as follows.
+ * { clear, clear } => the TD has never been used
+ * { set, clear } => the TD was handed to SONIC
+ * { set, set } => the TD was handed back
+ * { clear, set } => the TD is available for re-use
*/

netif_dbg(lp, intr, dev, "%s: tx done\n", __func__);
@@ -406,7 +422,12 @@ static irqreturn_t sonic_interrupt(int i
/* load CAM done */
if (status & SONIC_INT_LCD)
SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
- } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
+
+ status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT;
+ } while (status);
+
+ spin_unlock_irqrestore(&lp->lock, flags);
+
return IRQ_HANDLED;
}

--- a/drivers/net/ethernet/natsemi/sonic.h
+++ b/drivers/net/ethernet/natsemi/sonic.h
@@ -322,6 +322,7 @@ struct sonic_local {
int msg_enable;
struct device *device; /* generic device */
struct net_device_stats stats;
+ spinlock_t lock;
};

#define TX_TIMEOUT (3 * HZ)

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