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net: macb: restart tx after tx used bit read 

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: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Claudiu Beznea 2018-12-17 10:02:42 +00:00 committed by David S. Miller
parent b26322d2ac
commit 4298388574
1 changed files with 20 additions and 1 deletions
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21
drivers/net/ethernet/cadence/macb_main.c
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@ -61,7 +61,8 @@
#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
@ -1312,6 +1313,21 @@ static void macb_hresp_error_task(unsigned long data)
netif_tx_start_all_queues(dev);
}
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;
@ -1369,6 +1385,9 @@ 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.
*/