From: Parav Pandit <parav@nvidia.com>
To: Parav Pandit <parav@nvidia.com>,
Alexander Duyck <alexander.duyck@gmail.com>,
David Ahern <dsahern@gmail.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
Saeed Mahameed <saeed@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Leon Romanovsky <leonro@nvidia.com>,
Netdev <netdev@vger.kernel.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
David Ahern <dsahern@kernel.org>,
Jacob Keller <jacob.e.keller@intel.com>,
"Sridhar Samudrala" <sridhar.samudrala@intel.com>,
"Ertman, David M" <david.m.ertman@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
"Kiran Patil" <kiran.patil@intel.com>,
Greg KH <gregkh@linuxfoundation.org>
Subject: RE: [net-next v4 00/15] Add mlx5 subfunction support
Date: Fri, 18 Dec 2020 05:36:48 +0000 [thread overview]
Message-ID: <BY5PR12MB4322E1121673E1DDB0C5B2C4DCC30@BY5PR12MB4322.namprd12.prod.outlook.com> (raw)
In-Reply-To: <BY5PR12MB43220950B3A93B9E548976C7DCC30@BY5PR12MB4322.namprd12.prod.outlook.com>
> From: Parav Pandit <parav@nvidia.com>
> Sent: Friday, December 18, 2020 10:51 AM
>
> > From: Alexander Duyck <alexander.duyck@gmail.com>
> > Sent: Friday, December 18, 2020 8:41 AM
> >
> > On Thu, Dec 17, 2020 at 5:30 PM David Ahern <dsahern@gmail.com> wrote:
> > >
> > > On 12/16/20 3:53 PM, Alexander Duyck wrote:
> > The problem is PCIe DMA wasn't designed to function as a network
> > switch fabric and when we start talking about a 400Gb NIC trying to
> > handle over 256 subfunctions it will quickly reduce the
> > receive/transmit throughput to gigabit or less speeds when encountering
> hardware multicast/broadcast replication.
> > With 256 subfunctions a simple 60B ARP could consume more than 19KB of
> > PCIe bandwidth due to the packet having to be duplicated so many
> > times. In my mind it should be simpler to simply clone a single skb
> > 256 times, forward that to the switchdev ports, and have them perform
> > a bypass (if available) to deliver it to the subfunctions. That's why
> > I was thinking it might be a good time to look at addressing it.
> Linux tc framework is rich to address this and already used by openvswich for
> years now.
> Today arp broadcasts are not offloaded. They go through software patch and
s/patch/path
> replicated in the L2 domain.
> It is a solved problem for many years now.
next prev parent reply other threads:[~2020-12-18 5:37 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 21:43 [net-next v4 00/15] Add mlx5 subfunction support Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 01/15] net/mlx5: Fix compilation warning for 32-bit platform Saeed Mahameed
2020-12-14 22:31 ` Alexander Duyck
2020-12-14 22:45 ` Saeed Mahameed
2020-12-15 4:59 ` Leon Romanovsky
2020-12-14 21:43 ` [net-next v4 02/15] devlink: Prepare code to fill multiple port function attributes Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 03/15] devlink: Introduce PCI SF port flavour and port attribute Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 04/15] devlink: Support add and delete devlink port Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 05/15] devlink: Support get and set state of port function Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 06/15] net/mlx5: Introduce vhca state event notifier Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 07/15] net/mlx5: SF, Add auxiliary device support Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 08/15] net/mlx5: SF, Add auxiliary device driver Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 09/15] net/mlx5: E-switch, Prepare eswitch to handle SF vport Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 10/15] net/mlx5: E-switch, Add eswitch helpers for " Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 11/15] net/mlx5: SF, Add port add delete functionality Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 12/15] net/mlx5: SF, Port function state change support Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 13/15] devlink: Add devlink port documentation Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 14/15] devlink: Extend devlink port documentation for subfunctions Saeed Mahameed
2020-12-14 21:43 ` [net-next v4 15/15] net/mlx5: Add devlink subfunction port documentation Saeed Mahameed
2020-12-15 1:53 ` [net-next v4 00/15] Add mlx5 subfunction support Alexander Duyck
2020-12-15 2:44 ` David Ahern
2020-12-15 16:16 ` Alexander Duyck
2020-12-15 16:59 ` Parav Pandit
2020-12-15 5:48 ` Parav Pandit
2020-12-15 18:47 ` Alexander Duyck
2020-12-15 20:05 ` Saeed Mahameed
2020-12-15 21:03 ` Jason Gunthorpe
2020-12-16 1:12 ` Edwin Peer
2020-12-16 2:39 ` Jason Gunthorpe
2020-12-16 3:12 ` Alexander Duyck
2020-12-15 20:59 ` David Ahern
2020-12-15 6:15 ` Saeed Mahameed
2020-12-15 19:12 ` Alexander Duyck
2020-12-15 20:35 ` Saeed Mahameed
2020-12-15 21:28 ` Jakub Kicinski
2020-12-16 6:50 ` Leon Romanovsky
2020-12-16 17:59 ` Saeed Mahameed
2020-12-15 21:41 ` Alexander Duyck
2020-12-16 0:19 ` Jason Gunthorpe
2020-12-16 2:19 ` Alexander Duyck
2020-12-16 3:03 ` Jason Gunthorpe
2020-12-16 4:13 ` Alexander Duyck
2020-12-16 4:45 ` Parav Pandit
2020-12-16 13:33 ` Jason Gunthorpe
2020-12-16 16:31 ` Alexander Duyck
2020-12-16 17:51 ` Jason Gunthorpe
2020-12-16 19:27 ` Alexander Duyck
2020-12-16 20:35 ` Jason Gunthorpe
2020-12-16 22:53 ` Alexander Duyck
2020-12-17 0:38 ` Jason Gunthorpe
2020-12-17 18:48 ` Alexander Duyck
2020-12-17 19:40 ` Jason Gunthorpe
2020-12-17 21:05 ` Alexander Duyck
2020-12-18 0:08 ` Jason Gunthorpe
2020-12-18 1:30 ` David Ahern
2020-12-18 3:11 ` Alexander Duyck
2020-12-18 3:55 ` David Ahern
2020-12-18 15:54 ` Alexander Duyck
2020-12-18 5:20 ` Parav Pandit
2020-12-18 5:36 ` Parav Pandit [this message]
2020-12-18 16:01 ` Alexander Duyck
2020-12-18 18:01 ` Parav Pandit
2020-12-18 19:22 ` Alexander Duyck
2020-12-18 20:18 ` Jason Gunthorpe
2020-12-19 0:03 ` Alexander Duyck
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