From 72abf2179969a54c16c03b1649b922ec179b364a Mon Sep 17 00:00:00 2001 From: Harini Katakam Date: Fri, 17 Mar 2023 17:09:43 +0530 Subject: net: macb: Reset TX when TX halt times out Reset TX when halt times out i.e. disable TX, clean up TX BDs, interrupts (already done) and enable TX. This addresses the issue observed when iperf is run at 10Mps Half duplex where, after multiple collisions and retries, TX halts. Signed-off-by: Harini Katakam Signed-off-by: Michal Simek Signed-off-by: Radhey Shyam Pandey Reviewed-by: Michal Swiatkowski Acked-by: Nicolas Ferre Signed-off-by: David S. Miller --- drivers/net/ethernet/cadence/macb_main.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'drivers/net/ethernet/cadence') diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 7698719b1909..f77bd1223c8f 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -1070,6 +1070,7 @@ static void macb_tx_error_task(struct work_struct *work) { struct macb_queue *queue = container_of(work, struct macb_queue, tx_error_task); + bool halt_timeout = false; struct macb *bp = queue->bp; struct macb_tx_skb *tx_skb; struct macb_dma_desc *desc; @@ -1097,9 +1098,11 @@ static void macb_tx_error_task(struct work_struct *work) * (in case we have just queued new packets) * macb/gem must be halted to write TBQP register */ - if (macb_halt_tx(bp)) - /* Just complain for now, reinitializing TX path can be good */ + if (macb_halt_tx(bp)) { netdev_err(bp->dev, "BUG: halt tx timed out\n"); + macb_writel(bp, NCR, macb_readl(bp, NCR) & (~MACB_BIT(TE))); + halt_timeout = true; + } /* Treat frames in TX queue including the ones that caused the error. * Free transmit buffers in upper layer. @@ -1170,6 +1173,9 @@ static void macb_tx_error_task(struct work_struct *work) macb_writel(bp, TSR, macb_readl(bp, TSR)); queue_writel(queue, IER, MACB_TX_INT_FLAGS); + if (halt_timeout) + macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TE)); + /* Now we are ready to start transmission again */ netif_tx_start_all_queues(bp->dev); macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); -- cgit