[dpdk-dev] [PATCH v3 2/2] net/virtio: add link speed devarg

Maxime Coquelin maxime.coquelin at redhat.com
Wed Feb 12 11:40:40 CET 2020



On 2/12/20 11:35 AM, Tiwei Bie wrote:
> On Fri, Feb 07, 2020 at 02:25:26PM +0300, Ivan Dyukov wrote:
>> Some applications like pktgen use link_speed to calculate
>> transmit rate. It limits outcome traffic to hardcoded 10G.
>>
>> This patch adds link_speed devarg which allows to configure
>> link_speed of virtio device.
>>
>> Signed-off-by: Ivan Dyukov <i.dyukov at samsung.com>
>> ---
>>  doc/guides/nics/virtio.rst         |   7 ++
>>  drivers/net/virtio/virtio_ethdev.c | 101 ++++++++++++++++++++++++-----
>>  drivers/net/virtio/virtio_pci.h    |   1 +
>>  3 files changed, 92 insertions(+), 17 deletions(-)
> 
> Maybe I missed something.. Why not enable the VIRTIO_NET_F_SPEED_DUPLEX
> support directly? When that feature is supported and negotiated,
> we will ignore this devarg?

IMHO, yes. When VIRTIO_NET_F_SPEED_DUPLEX will be implemented and
negotiated, this devarg will be ignored.

> If we want this devarg, it looks better to support it in virtio-user
> as well (most code is shared between virtio-PMD and virtio-user).

That's a valid point, Virtio-user should also support it.
Ivan, can you send a new revision with Virtio-user support as well?

Thanks,
Maxime

> Thanks!
> Tiwei
> 



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