From: Remi Pommarel <repk@triplefau.lt>
To: Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Jose Abreu <joabreu@synopsys.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Remi Pommarel <repk@triplefau.lt>,
linux-amlogic@lists.infradead.org,
"David S. Miller" <davem@davemloft.net>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] net: stmmac: dwmac1000: Disable ACS if enhanced descs are not used
Date: Fri, 6 Mar 2020 20:30:36 +0100 [thread overview]
Message-ID: <20200306193036.18414-1-repk@triplefau.lt> (raw)
ACS (auto PAD/FCS stripping) removes FCS off 802.3 packets (LLC) so that
there is no need to manually strip it for such packets. The enhanced DMA
descriptors allow to flag LLC packets so that the receiving callback can
use that to strip FCS manually or not. On the other hand, normal
descriptors do not support that.
Thus in order to not truncate LLC packet ACS should be disabled when
using normal DMA descriptors.
Signed-off-by: Remi Pommarel <repk@triplefau.lt>
---
drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
index d0356fbd1e43..b468acf03b00 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
@@ -25,6 +25,7 @@ static void dwmac1000_core_init(struct mac_device_info *hw,
struct net_device *dev)
{
void __iomem *ioaddr = hw->pcsr;
+ struct stmmac_priv *priv = netdev_priv(dev);
u32 value = readl(ioaddr + GMAC_CONTROL);
int mtu = dev->mtu;
@@ -35,7 +36,7 @@ static void dwmac1000_core_init(struct mac_device_info *hw,
* Broadcom tags can look like invalid LLC/SNAP packets and cause the
* hardware to truncate packets on reception.
*/
- if (netdev_uses_dsa(dev))
+ if (netdev_uses_dsa(dev) || !priv->plat->enh_desc)
value &= ~GMAC_CONTROL_ACS;
if (mtu > 1500)
--
2.25.0
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
next reply other threads:[~2020-03-06 19:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-06 19:30 Remi Pommarel [this message]
2020-03-07 17:34 ` Jose Abreu
2020-03-08 9:25 ` Remi Pommarel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200306193036.18414-1-repk@triplefau.lt \
--to=repk@triplefau.lt \
--cc=alexandre.torgue@st.com \
--cc=davem@davemloft.net \
--cc=joabreu@synopsys.com \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=peppe.cavallaro@st.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®