From: Jakub Kicinski <kuba@kernel.org>
To: Aya Levin <ayal@mellanox.com>
Cc: Saeed Mahameed <saeedm@mellanox.com>,
"David S. Miller" <davem@davemloft.net>,
"mkubecek@suse.cz" <mkubecek@suse.cz>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"helgaas@kernel.org" <helgaas@kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
Tariq Toukan <tariqt@mellanox.com>,
"alexander.h.duyck@linux.intel.com\""
<alexander.h.duyck@linux.intel.com>
Subject: Re: [net-next 10/10] net/mlx5e: Add support for PCI relaxed ordering
Date: Mon, 6 Jul 2020 09:52:17 -0700 [thread overview]
Message-ID: <20200706095217.55c34281@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <7b79eead-ceab-5d95-fd91-cabeeef82d6a@mellanox.com>
On Mon, 6 Jul 2020 16:00:59 +0300 Aya Levin wrote:
> Assuming the discussions with Bjorn will conclude in a well-trusted API
> that ensures relaxed ordering in enabled, I'd still like a method to
> turn off relaxed ordering for performance debugging sake.
> Bjorn highlighted the fact that the PCIe sub system can only offer a
> query method. Even if theoretically a set API will be provided, this
> will not fit a netdev debugging - I wonder if CPU vendors even support
> relaxed ordering set/unset...
> On the driver's side relaxed ordering is an attribute of the mkey and
> should be available for configuration (similar to number of CPU vs.
> number of channels).
> Based on the above, and binding the driver's default relaxed ordering to
> the return value from pcie_relaxed_ordering_enabled(), may I continue
> with previous direction of a private-flag to control the client side (my
> driver) ?
That's fine with me, chicken bit seems reasonable as long as the
default is dictated by the PCI subsystem. I have no particularly
strong feeling on the API used for the chicken bit, but others may.
next prev parent reply other threads:[~2020-07-06 16:52 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200623195229.26411-1-saeedm@mellanox.com>
[not found] ` <20200623195229.26411-11-saeedm@mellanox.com>
[not found] ` <20200623143118.51373eb7@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
[not found] ` <dda5c2b729bbaf025592aa84e2bdb84d0cda7570.camel@mellanox.com>
[not found] ` <082c6bfe-5146-c213-9220-65177717c342@mellanox.com>
2020-06-24 17:22 ` [net-next 10/10] net/mlx5e: Add support for PCI relaxed ordering Jakub Kicinski
2020-06-24 20:15 ` Saeed Mahameed
[not found] ` <20200624133018.5a4d238b@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
2020-07-06 13:00 ` Aya Levin
2020-07-06 16:52 ` Jakub Kicinski [this message]
2020-07-06 19:49 ` David Miller
2040-07-08 8:22 ` Aya Levin
2020-07-08 23:16 ` Bjorn Helgaas
2020-07-08 23:26 ` Jason Gunthorpe
2020-07-09 17:35 ` Jonathan Lemon
2020-07-09 18:20 ` Jason Gunthorpe
2020-07-09 19:47 ` Jakub Kicinski
2020-07-10 2:18 ` Saeed Mahameed
2020-07-10 12:21 ` Jason Gunthorpe
2020-07-09 20:33 ` Jonathan Lemon
2020-07-14 10:47 ` Aya Levin
2020-07-23 21:03 ` Alexander Duyck
2020-06-26 20:12 ` Bjorn Helgaas
2020-06-26 20:24 ` David Miller
2020-06-29 9:32 ` Aya Levin
2020-06-29 19:33 ` Bjorn Helgaas
2020-06-29 19:57 ` Raj, Ashok
2020-06-30 7:32 ` Ding Tianhong
2020-07-05 11:15 ` Aya Levin
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