net: macb: Restart tx only if queue pointer is lagging

[ Upstream commit 5ad7f18cd82cee8e773d40cc7a1465a526f2615c ]

commit 4298388574da ("net: macb: restart tx after tx used bit read")
added support for restarting transmission. Restarting tx does not work
in case controller asserts TXUBR interrupt and TQBP is already at the end
of the tx queue. In that situation, restarting tx will immediately cause
assertion of another TXUBR interrupt. The driver will end up in an infinite
interrupt loop which it cannot break out of.

For cases where TQBP is at the end of the tx queue, instead
only clear TX_USED interrupt. As more data gets pushed to the queue,
transmission will resume.

This issue was observed on a Xilinx Zynq-7000 based board.
During stress test of the network interface,
driver would get stuck on interrupt loop within seconds or minutes
causing CPU to stall.

Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220407161659.14532-1-tomas.melin@vaisala.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 9705c49655ad3c9a3439067ded3e3431f0b8dce2..217c1a0f8940b663646b99e7189eb145fc535161 100644 (file)
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -1689,6 +1689,7 @@ 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;
+       unsigned int head_idx, tbqp;
 
        if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
                queue_writel(queue, ISR, MACB_BIT(TXUBR));
@@ -1696,6 +1697,13 @@ static void macb_tx_restart(struct macb_queue *queue)
        if (head == tail)
                return;
 
+       tbqp = queue_readl(queue, TBQP) / macb_dma_desc_get_size(bp);
+       tbqp = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, tbqp));
+       head_idx = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, head));
+
+       if (tbqp == head_idx)
+               return;
+
        macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
 }