From: chf.fritz@googlemail.com
To: barebox@lists.infradead.org
Subject: [PATCH 2/3] net cpsw: fix rx stability under heavy network load
Date: Wed, 30 Apr 2014 10:32:02 +0200 [thread overview]
Message-ID: <5360b519.c62a980a.05b6.526d@mx.google.com> (raw)
In-Reply-To: <1398846723-10241-1-git-send-email-y>
From: Christoph Fritz <chf.fritz@googlemail.com>
RX DMA Head Descriptor Pointer can get 0 when there is a lot of traffic,
which results in a timeout error. A good way to provoke this error is by
sending lots of ARP requests. This patch makes sure that the RX DMA Head
Descriptor Pointer is set.
The origin driver, from which this is derived, already contains this fix.
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
---
drivers/net/cpsw.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/cpsw.c b/drivers/net/cpsw.c
index 52adf50..ec3263d 100644
--- a/drivers/net/cpsw.c
+++ b/drivers/net/cpsw.c
@@ -741,8 +741,13 @@ static int cpdma_process(struct cpsw_priv *priv, struct cpdma_chan *chan,
if (buffer)
*buffer = (void *)readl(&desc->sw_buffer);
- if (status & CPDMA_DESC_OWNER)
+ if (status & CPDMA_DESC_OWNER) {
+ if (readl(chan->hdp) == 0) {
+ if (readl(&desc->hw_mode) & CPDMA_DESC_OWNER)
+ writel((u32)desc, chan->hdp);
+ }
return -EBUSY;
+ }
chan->head = (void *)readl(&desc->hw_next);
--
1.7.10.4
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next prev parent reply other threads:[~2014-04-30 8:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1398846723-10241-1-git-send-email-y>
2014-04-30 8:32 ` [PATCH 1/3] tftp: add timeframe when remote server is retransmitting chf.fritz
2014-05-05 7:20 ` Sascha Hauer
2014-04-30 8:32 ` chf.fritz [this message]
2014-05-05 7:21 ` [PATCH 2/3] net cpsw: fix rx stability under heavy network load Sascha Hauer
2014-04-30 8:32 ` [PATCH 3/3] net cpsw: check phy status on send and receive chf.fritz
2014-05-05 7:22 ` Sascha Hauer
2014-05-05 8:36 ` Christoph Fritz
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