diff mbox series

[V5,net,5/5] net: stmmac: re-init rx buffers when mac resume back

Message ID 20210225090114.17562-6-qiangqing.zhang@nxp.com
State New
Headers show
Series ethernet: fixes for stmmac driver | expand

Commit Message

Joakim Zhang Feb. 25, 2021, 9:01 a.m. UTC 
During suspend/resume stress test, we found descriptor write back by DMA
could exhibit unusual behavior, e.g.:
	003 [0xc4310030]: 0x0 0x40 0x0 0xb5010040

We can see that desc3 write back is 0xb5010040, it is still ownd by DMA,
so application would not recycle this buffer. It will trigger fatal bus
error when DMA try to use this descriptor again. To fix this issue, we
should re-init all rx buffers when mac resume back.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 84 ++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6cf6ba59c07f..0c97d1a5504e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1379,6 +1379,88 @@  static void stmmac_free_tx_buffer(struct stmmac_priv *priv, u32 queue, int i)
 	}
 }
 
+/**
+ * stmmac_reinit_rx_buffers - reinit the RX descriptor buffer.
+ * @priv: driver private structure
+ * Description: this function is called to re-allocate a receive buffer, perform
+ * the DMA mapping and init the descriptor.
+ */
+static void stmmac_reinit_rx_buffers(struct stmmac_priv *priv)
+{
+	u32 rx_count = priv->plat->rx_queues_to_use;
+	u32 queue;
+	int i;
+
+	for (queue = 0; queue < rx_count; queue++) {
+		struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
+
+		for (i = 0; i < priv->dma_rx_size; i++) {
+			struct stmmac_rx_buffer *buf = &rx_q->buf_pool[i];
+
+			if (buf->page) {
+				page_pool_recycle_direct(rx_q->page_pool, buf->page);
+				buf->page = NULL;
+			}
+
+			if (priv->sph && buf->sec_page) {
+				page_pool_recycle_direct(rx_q->page_pool, buf->sec_page);
+				buf->sec_page = NULL;
+			}
+		}
+	}
+
+	for (queue = 0; queue < rx_count; queue++) {
+		struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
+
+		for (i = 0; i < priv->dma_rx_size; i++) {
+			struct stmmac_rx_buffer *buf = &rx_q->buf_pool[i];
+			struct dma_desc *p;
+
+			if (priv->extend_desc)
+				p = &((rx_q->dma_erx + i)->basic);
+			else
+				p = rx_q->dma_rx + i;
+
+			if (!buf->page) {
+				buf->page = page_pool_dev_alloc_pages(rx_q->page_pool);
+				if (!buf->page)
+					goto err_reinit_rx_buffers;
+
+				buf->addr = page_pool_get_dma_addr(buf->page);
+			}
+
+			if (priv->sph && !buf->sec_page) {
+				buf->sec_page = page_pool_dev_alloc_pages(rx_q->page_pool);
+				if (!buf->sec_page)
+					goto err_reinit_rx_buffers;
+
+				buf->sec_addr = page_pool_get_dma_addr(buf->sec_page);
+			}
+
+			stmmac_set_desc_addr(priv, p, buf->addr);
+			if (priv->sph)
+				stmmac_set_desc_sec_addr(priv, p, buf->sec_addr, true);
+			else
+				stmmac_set_desc_sec_addr(priv, p, buf->sec_addr, false);
+			if (priv->dma_buf_sz == BUF_SIZE_16KiB)
+				stmmac_init_desc3(priv, p);
+		}
+	}
+
+	return;
+
+err_reinit_rx_buffers:
+	do {
+		while (--i >= 0)
+			stmmac_free_rx_buffer(priv, queue, i);
+
+		if (queue == 0)
+			break;
+
+		i = priv->dma_rx_size;
+	} while (queue-- > 0);
+}
+
 /**
  * init_dma_rx_desc_rings - init the RX descriptor rings
  * @dev: net device structure
@@ -5343,7 +5425,7 @@  int stmmac_resume(struct device *dev)
 	mutex_lock(&priv->lock);
 
 	stmmac_reset_queues_param(priv);
-
+	stmmac_reinit_rx_buffers(priv);
 	stmmac_free_tx_skbufs(priv);
 	stmmac_clear_descriptors(priv);