From: David Laight <David.Laight@ACULAB.COM>
To: 'Paul Burton' <paul.burton@mips.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Cc: Hassan Naveed <hassan.naveed@mips.com>,
Matt Redfearn <matt.redfearn@mips.com>,
"David S . Miller" <davem@davemloft.net>,
"linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
Subject: RE: [PATCH v5 07/14] net: pch_gbe: Fix handling of TX padding
Date: Mon, 19 Feb 2018 14:01:25 +0000 [thread overview]
Message-ID: <33d3777368d244a79c6287b2e955853f@AcuMS.aculab.com> (raw)
In-Reply-To: <20180217201037.3006-8-paul.burton@mips.com>
From: Paul Burton
> Sent: 17 February 2018 20:11
>
> The ethernet controller found in the Intel EG20T Platform Controller
> Hub requires that we place 2 bytes of padding between the ethernet
> header & the packet payload. Our pch_gbe driver handles this by copying
> packets to be transmitted to a temporary struct skb with the padding
> bytes inserted
...
Uggg WFT is the driver doing that for?
I'd guess that the two byte pad is there so that a 4 byte aligned
frame is still 4 byte aligned when the 14 byte ethernet header is added.
So instead of copying the entire frame the MAC header should be built
(or rebuilt?) two bytes further from the actual data.
David
next prev parent reply other threads:[~2018-02-19 14:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-17 20:10 [PATCH v5 00/14] net: pch_gbe: Fixes & MIPS support Paul Burton
2018-02-17 20:10 ` [PATCH v5 01/14] net: pch_gbe: Mark Minnow PHY reset GPIO active low Paul Burton
2018-02-17 22:14 ` Andrew Lunn
2018-02-17 20:10 ` [PATCH v5 02/14] net: pch_gbe: Pull PHY GPIO handling out of Minnow code Paul Burton
2018-02-17 22:29 ` Andrew Lunn
2018-02-17 22:50 ` Paul Burton
2018-02-17 23:34 ` Andrew Lunn
2018-02-18 15:51 ` Paul Burton
2018-02-18 16:14 ` Andrew Lunn
2018-02-17 20:10 ` [PATCH v5 03/14] dt-bindings: net: Document Intel pch_gbe binding Paul Burton
[not found] ` <20180217201037.3006-4-paul.burton-8NJIiSa5LzA@public.gmane.org>
2018-02-17 22:32 ` Andrew Lunn
2018-02-17 20:10 ` [PATCH v5 04/14] net: pch_gbe: Add device tree support Paul Burton
2018-02-17 20:10 ` [PATCH v5 05/14] net: pch_gbe: Always reset PHY along with MAC Paul Burton
2018-02-17 20:10 ` [PATCH v5 06/14] net: pch_gbe: Allow longer for resets Paul Burton
2018-02-18 15:29 ` kbuild test robot
2018-02-17 20:10 ` [PATCH v5 07/14] net: pch_gbe: Fix handling of TX padding Paul Burton
2018-02-19 14:01 ` David Laight [this message]
2018-02-19 16:42 ` Paul Burton
2018-02-19 16:41 ` David Miller
2018-02-17 20:10 ` [PATCH v5 08/14] net: pch_gbe: Fold pch_gbe_setup_[rt]ctl into pch_gbe_configure_[rt]x Paul Burton
2018-02-17 20:10 ` [PATCH v5 09/14] net: pch_gbe: Use pch_gbe_disable_dma_rx() in pch_gbe_configure_rx() Paul Burton
2018-02-17 20:10 ` [PATCH v5 10/14] net: pch_gbe: Disable TX DMA whilst configuring descriptors Paul Burton
2018-02-17 20:10 ` [PATCH v5 11/14] net: pch_gbe: Ensure DMA is ordered with descriptor writes Paul Burton
2018-02-17 20:10 ` [PATCH v5 12/14] net: pch_gbe: Fix TX RX descriptor accesses for big endian systems Paul Burton
2018-02-18 16:01 ` kbuild test robot
2018-02-17 20:10 ` [PATCH v5 13/14] ptp: pch: Allow build on MIPS platforms Paul Burton
2018-02-17 20:10 ` [PATCH v5 14/14] net: pch_gbe: " Paul Burton
2018-02-18 15:31 ` [PATCH v5 00/14] net: pch_gbe: Fixes & MIPS support David Miller
2018-02-18 17:03 ` Paul Burton
2018-02-18 17:56 ` Andrew Lunn
2018-02-18 22:09 ` Paul Burton
2018-02-19 1:15 ` David Miller
2018-02-19 2:17 ` Florian Fainelli
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