[PATCH 3/5] net: cpsw: cpsw_process should only handle rx channels for its own port

[Michael Grzeschik <m.grzeschik@pengutronix.de>]

The driver is currently processing the whole channel list, so it is
possible that it handles a channel of the wrong interface. We limit the
rx_chan handling for its desired port.

The cpsw_send is removing finished tx_chan transfers on each send, so this
has no directional limitation.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
---
 drivers/net/cpsw.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/net/cpsw.c b/drivers/net/cpsw.c
index 55d7ad5f5b..aabfc76ad6 100644
--- a/drivers/net/cpsw.c
+++ b/drivers/net/cpsw.c
@@ -52,6 +52,9 @@
 #define CPDMA_DESC_EOP		BIT(30)
 #define CPDMA_DESC_OWNER	BIT(29)
 #define CPDMA_DESC_EOQ		BIT(28)
+#define CPDMA_FROM_TO_PORT_SHIFT	16
+#define CPDMA_RX_SOURCE_PORT(__status__)	\
+	(((__status__) >> CPDMA_FROM_TO_PORT_SHIFT) & 0x7)
 
 #define SLIVER_SIZE		0x40
 
@@ -758,10 +761,11 @@ done:
 	return 0;
 }
 
-static int cpdma_process(struct cpsw_priv *priv, struct cpdma_chan *chan,
+static int cpdma_process(struct cpsw_slave *slave, struct cpdma_chan *chan,
 			 void **buffer, int *len)
 {
 	struct cpdma_desc *desc = chan->head;
+	struct cpsw_priv *priv = slave->cpsw;
 	u32 status;
 
 	if (!desc)
@@ -783,6 +787,14 @@ static int cpdma_process(struct cpsw_priv *priv, struct cpdma_chan *chan,
 		return -EBUSY;
 	}
 
+	/* cpsw_send is cleaning finished descriptors on next send
+	 * so we only have to check for rx channel here
+	 */
+	if (CPDMA_RX_SOURCE_PORT(status) != BIT(slave->slave_num) &&
+	    chan == &priv->rx_chan) {
+		return -ENOMSG;
+	}
+
 	chan->head = (void *)readl(&desc->hw_next);
 
 	writel((u32)desc, chan->cp);
@@ -917,7 +929,7 @@ static int cpsw_send(struct eth_device *edev, void *packet, int length)
 	dev_dbg(&slave->dev, "* %s slave %d\n", __func__, slave->slave_num);
 
 	/* first reap completed packets */
-	while (cpdma_process(priv, &priv->tx_chan, &buffer, &len) >= 0);
+	while (cpdma_process(slave, &priv->tx_chan, &buffer, &len) >= 0);
 
 	dev_dbg(&slave->dev, "%s: %i bytes @ 0x%p\n", __func__, length, packet);
 
@@ -935,7 +947,7 @@ static int cpsw_recv(struct eth_device *edev)
 	void *buffer;
 	int len;
 
-	while (cpdma_process(priv, &priv->rx_chan, &buffer, &len) >= 0) {
+	while (cpdma_process(slave, &priv->rx_chan, &buffer, &len) >= 0) {
 		dma_sync_single_for_cpu((unsigned long)buffer, len,
 				DMA_FROM_DEVICE);
 		net_receive(edev, buffer, len);
-- 
2.26.2


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