diff options
| author | Harini Katakam <harini.katakam@xilinx.com> | 2018-01-27 12:09:01 +0530 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-29 14:25:47 -0500 |
| commit | 032dc41ba6e2744a8105e1743607fc4ee155278d (patch) | |
| tree | ef820ab373218126c2ee71901e50101bbdd1e9b2 /drivers | |
| parent | 468330e886ee347778f106b343580cf018ad650f (diff) | |
net: macb: Handle HRESP error
Handle HRESP error by doing a SW reset of RX and TX and
re-initializing the descriptors, RX and TX queue pointers.
Signed-off-by: Harini Katakam <harinik@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/cadence/macb.h | 3 | ||||
| -rw-r--r-- | drivers/net/ethernet/cadence/macb_main.c | 59 |
2 files changed, 58 insertions, 4 deletions
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index c50c5ec49b1d..86659823b259 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -13,6 +13,7 @@ #include <linux/phy.h> #include <linux/ptp_clock_kernel.h> #include <linux/net_tstamp.h> +#include <linux/interrupt.h> #if defined(CONFIG_ARCH_DMA_ADDR_T_64BIT) || defined(CONFIG_MACB_USE_HWSTAMP) #define MACB_EXT_DESC @@ -1200,6 +1201,8 @@ struct macb { struct ethtool_rx_fs_list rx_fs_list; spinlock_t rx_fs_lock; unsigned int max_tuples; + + struct tasklet_struct hresp_err_tasklet; }; #ifdef CONFIG_MACB_USE_HWSTAMP diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 234667eaaa92..e84afcf1ecb5 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -1258,6 +1258,57 @@ static int macb_poll(struct napi_struct *napi, int budget) return work_done; } +static void macb_hresp_error_task(unsigned long data) +{ + struct macb *bp = (struct macb *)data; + struct net_device *dev = bp->dev; + struct macb_queue *queue = bp->queues; + unsigned int q; + u32 ctrl; + + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { + queue_writel(queue, IDR, MACB_RX_INT_FLAGS | + MACB_TX_INT_FLAGS | + MACB_BIT(HRESP)); + } + ctrl = macb_readl(bp, NCR); + ctrl &= ~(MACB_BIT(RE) | MACB_BIT(TE)); + macb_writel(bp, NCR, ctrl); + + netif_tx_stop_all_queues(dev); + netif_carrier_off(dev); + + bp->macbgem_ops.mog_init_rings(bp); + + /* Initialize TX and RX buffers */ + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { + queue_writel(queue, RBQP, lower_32_bits(queue->rx_ring_dma)); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + queue_writel(queue, RBQPH, + upper_32_bits(queue->rx_ring_dma)); +#endif + queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma)); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + queue_writel(queue, TBQPH, + upper_32_bits(queue->tx_ring_dma)); +#endif + + /* Enable interrupts */ + queue_writel(queue, IER, + MACB_RX_INT_FLAGS | + MACB_TX_INT_FLAGS | + MACB_BIT(HRESP)); + } + + ctrl |= MACB_BIT(RE) | MACB_BIT(TE); + macb_writel(bp, NCR, ctrl); + + netif_carrier_on(dev); + netif_tx_start_all_queues(dev); +} + static irqreturn_t macb_interrupt(int irq, void *dev_id) { struct macb_queue *queue = dev_id; @@ -1347,10 +1398,7 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id) } if (status & MACB_BIT(HRESP)) { - /* TODO: Reset the hardware, and maybe move the - * netdev_err to a lower-priority context as well - * (work queue?) - */ + tasklet_schedule(&bp->hresp_err_tasklet); netdev_err(dev, "DMA bus error: HRESP not OK\n"); if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) @@ -3937,6 +3985,9 @@ static int macb_probe(struct platform_device *pdev) goto err_out_unregister_mdio; } + tasklet_init(&bp->hresp_err_tasklet, macb_hresp_error_task, + (unsigned long)bp); + phy_attached_info(phydev); netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n", |