Commit 6e12baae authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Greg Kroah-Hartman

net: macb: restart tx after tx used bit read

[ Upstream commit 42983885 ]

On some platforms (currently detected only on SAMA5D4) TX might stuck
even the pachets are still present in DMA memories and TX start was
issued for them. This happens due to race condition between MACB driver
updating next TX buffer descriptor to be used and IP reading the same
descriptor. In such a case, the "TX USED BIT READ" interrupt is asserted.
GEM/MACB user guide specifies that if a "TX USED BIT READ" interrupt
is asserted TX must be restarted. Restart TX if used bit is read and
packets are present in software TX queue. Packets are removed from software
TX queue if TX was successful for them (see macb_tx_interrupt()).
Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 95b4b711
......@@ -60,7 +60,8 @@
#define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \
| MACB_BIT(ISR_RLE) \
| MACB_BIT(TXERR))
#define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP))
#define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP) \
| MACB_BIT(TXUBR))
/* Max length of transmit frame must be a multiple of 8 bytes */
#define MACB_TX_LEN_ALIGN 8
......@@ -1243,6 +1244,21 @@ static int macb_poll(struct napi_struct *napi, int budget)
return work_done;
}
static void macb_tx_restart(struct macb_queue *queue)
{
unsigned int head = queue->tx_head;
unsigned int tail = queue->tx_tail;
struct macb *bp = queue->bp;
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
queue_writel(queue, ISR, MACB_BIT(TXUBR));
if (head == tail)
return;
macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
}
static irqreturn_t macb_interrupt(int irq, void *dev_id)
{
struct macb_queue *queue = dev_id;
......@@ -1300,6 +1316,9 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
if (status & MACB_BIT(TCOMP))
macb_tx_interrupt(queue);
if (status & MACB_BIT(TXUBR))
macb_tx_restart(queue);
/* Link change detection isn't possible with RMII, so we'll
* add that if/when we get our hands on a full-blown MII PHY.
*/
......
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