From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Esben Haabendal <esben@geanix.com>,
netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
Michal Simek <michal.simek@xilinx.com>,
Yang Wei <yang.wei9@zte.com.cn>,
YueHaibing <yuehaibing@huawei.com>,
Luis Chamberlain <mcgrof@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/12] net: ll_temac: Fix support for 64-bit platforms
Date: Fri, 26 Apr 2019 15:30:56 -0700 [thread overview]
Message-ID: <20190426153056.6c8f64ba@cakuba.netronome.com> (raw)
In-Reply-To: <20190426220226.GW4041@lunn.ch>
On Sat, 27 Apr 2019 00:02:26 +0200, Andrew Lunn wrote:
> On Fri, Apr 26, 2019 at 02:08:56PM -0700, Jakub Kicinski wrote:
> > On Fri, 26 Apr 2019 22:59:12 +0200, Andrew Lunn wrote:
> > > On Fri, Apr 26, 2019 at 11:40:13AM -0700, Jakub Kicinski wrote:
> > > > On Fri, 26 Apr 2019 09:32:22 +0200, Esben Haabendal wrote:
> > > > > The use of buffer descriptor APP4 field (32-bit) for storing skb pointer
> > > > > obviously does not work on 64-bit platforms.
> > > > > As APP3 is also unused, we can use that to store the other half of 64-bit
> > > > > pointer values.
> > > > >
> > > > > Contrary to what is hinted at in commit message of commit 15bfe05c8d63
> > > > > ("net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit")
> > > > > there are no other pointers stored in cdmac_bd.
> > > > >
> > > > > Signed-off-by: Esben Haabendal <esben@geanix.com>
> > > >
> > > > This is a bit strange, the driver stores the host's virtual address into
> > > > the HW descriptor?
>
> Lets try that again
>
> Hi Jakub
:)
> > > Hi Jukub
> >
> > I need to start keeping track of all the ways my name gets spelled :)
> > I find it entertaining :)
>
> Sorry.
>
> And i prefer entertaining over offended :-)
Certainly no offence taken! :)
> > > This is reasonably common. You need some sort of cookie which links
> > > the hardware descriptor to the skbuf it points to. The hardware makes
> > > no use of it, it is just a cookie.
> >
> > Right, but accesses to HW descriptor memory ring are significantly
> > more expensive, especially on platforms which are not coherent with
> > DMA operations (everything but x86?)
> >
> > A preferable design is to have two descriptor rings - one for HW
> > descriptors and one for software context, no?
>
> Modern drivers do that. But this driver seems to be quite old. And if
> you look at what it is used on, PPC & MICROBLAZE, they are old
> architectures, i don't think hardware access are that as expensive as
> for modern architectures.
True, my comment was certainly more of a suggestion than a blocker.
Looking closer at the series it kind of looks like a soft IP.
Esben, is there anything architecture specific here? Should we perhaps
drop the dependency on the architectures in patch 6 completely?
next prev parent reply other threads:[~2019-04-26 22:31 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-26 7:32 [PATCH 00/12] net: ll_temac: x86_64 support Esben Haabendal
2019-04-26 7:32 ` [PATCH 01/12] net: ll_temac: Fix and simplify error handling by using devres functions Esben Haabendal
2019-04-26 7:32 ` [PATCH 02/12] net: ll_temac: Extend support to non-device-tree platforms Esben Haabendal
2019-04-26 13:58 ` Andrew Lunn
2019-04-26 7:32 ` [PATCH 03/12] net: ll_temac: Fix support for 64-bit platforms Esben Haabendal
2019-04-26 18:40 ` Jakub Kicinski
2019-04-26 20:59 ` Andrew Lunn
2019-04-26 21:08 ` Jakub Kicinski
2019-04-26 22:02 ` Andrew Lunn
2019-04-26 22:30 ` Jakub Kicinski [this message]
2019-04-27 8:49 ` Esben Haabendal
2019-04-26 7:32 ` [PATCH 04/12] net: ll_temac: Add support for non-native register endianness Esben Haabendal
2019-04-26 7:32 ` [PATCH 05/12] net: ll_temac: Fix support for little-endian platforms Esben Haabendal
2019-04-26 7:32 ` [PATCH 06/12] net: ll_temac: Allow use on x86 platforms Esben Haabendal
2019-04-26 14:05 ` Andrew Lunn
2019-04-26 7:32 ` [PATCH 07/12] net: ll_temac: Support indirect_mutex share within TEMAC IP Esben Haabendal
2019-04-26 14:14 ` Andrew Lunn
2019-04-26 7:32 ` [PATCH 08/12] net: ll_temac: Fix iommu/swiotlb leak Esben Haabendal
2019-04-26 14:21 ` Andrew Lunn
2019-04-26 14:43 ` Robin Murphy
2019-04-26 15:37 ` Andrew Lunn
2019-04-26 7:32 ` [PATCH 09/12] net: ll_temac: Fix bug causing buffer descriptor overrun Esben Haabendal
2019-04-26 7:32 ` [PATCH 10/12] net: ll_temac: Replace bad usage of msleep() with usleep_range() Esben Haabendal
2019-04-26 14:01 ` Andrew Lunn
2019-04-26 7:32 ` [PATCH 11/12] net: ll_temac: Allow configuration of IRQ coalescing Esben Haabendal
2019-04-26 7:32 ` [PATCH 12/12] net: ll_temac: Enable DMA when ready, not before Esben Haabendal
2019-04-29 8:34 ` [PATCH 00/12] net: ll_temac: x86_64 support Esben Haabendal
2019-04-29 8:34 ` [PATCH 01/12] net: ll_temac: Fix and simplify error handling by using devres functions Esben Haabendal
2019-04-29 8:34 ` [PATCH 02/12] net: ll_temac: Extend support to non-device-tree platforms Esben Haabendal
2019-04-29 8:34 ` [PATCH 03/12] net: ll_temac: Fix support for 64-bit platforms Esben Haabendal
2019-04-29 22:06 ` Andrew Lunn
2019-04-29 8:34 ` [PATCH 04/12] net: ll_temac: Add support for non-native register endianness Esben Haabendal
2019-04-29 8:34 ` [PATCH 05/12] net: ll_temac: Fix support for little-endian platforms Esben Haabendal
2019-04-29 8:34 ` [PATCH 06/12] net: ll_temac: Allow use on x86 platforms Esben Haabendal
2019-04-29 22:06 ` Andrew Lunn
2019-04-29 8:34 ` [PATCH 07/12] net: ll_temac: Support indirect_mutex share within TEMAC IP Esben Haabendal
2019-04-29 22:12 ` Andrew Lunn
2019-04-30 6:54 ` Esben Haabendal
2019-04-29 8:34 ` [PATCH 08/12] net: ll_temac: Fix iommu/swiotlb leak Esben Haabendal
2019-04-29 8:34 ` [PATCH 09/12] net: ll_temac: Fix bug causing buffer descriptor overrun Esben Haabendal
2019-04-29 8:34 ` [PATCH 10/12] net: ll_temac: Replace bad usage of msleep() with usleep_range() Esben Haabendal
2019-04-29 8:34 ` [PATCH 11/12] net: ll_temac: Allow configuration of IRQ coalescing Esben Haabendal
2019-04-29 8:34 ` [PATCH 12/12] net: ll_temac: Enable DMA when ready, not before Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 00/12] net: ll_temac: x86_64 support Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 01/12] net: ll_temac: Fix and simplify error handling by using devres functions Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 02/12] net: ll_temac: Extend support to non-device-tree platforms Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 03/12] net: ll_temac: Fix support for 64-bit platforms Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 04/12] net: ll_temac: Add support for non-native register endianness Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 05/12] net: ll_temac: Fix support for little-endian platforms Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 06/12] net: ll_temac: Allow use on x86 platforms Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 07/12] net: ll_temac: Support indirect_mutex share within TEMAC IP Esben Haabendal
2019-04-30 16:59 ` Andrew Lunn
2019-04-30 7:17 ` [PATCH v3 08/12] net: ll_temac: Fix iommu/swiotlb leak Esben Haabendal
2019-04-30 17:00 ` Andrew Lunn
2019-04-30 7:17 ` [PATCH v3 09/12] net: ll_temac: Fix bug causing buffer descriptor overrun Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 10/12] net: ll_temac: Replace bad usage of msleep() with usleep_range() Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 11/12] net: ll_temac: Allow configuration of IRQ coalescing Esben Haabendal
2019-04-30 7:17 ` [PATCH v3 12/12] net: ll_temac: Enable DMA when ready, not before Esben Haabendal
2019-05-01 18:33 ` [PATCH v3 00/12] net: ll_temac: x86_64 support David Miller
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