From: Jakub Kicinski <kuba@kernel•org>
To: longli@linuxonhyperv•com
Cc: "K. Y. Srinivasan" <kys@microsoft•com>,
Haiyang Zhang <haiyangz@microsoft•com>,
Wei Liu <wei.liu@kernel•org>, Dexuan Cui <decui@microsoft•com>,
"David S. Miller" <davem@davemloft•net>,
Eric Dumazet <edumazet@google•com>,
Paolo Abeni <pabeni@redhat•com>,
linux-hyperv@vger•kernel.org, netdev@vger•kernel.org,
linux-kernel@vger•kernel.org, Long Li <longli@microsoft•com>
Subject: Re: [PATCH net-next v4] hv_netvsc: Mark VF as slave before exposing it to user-mode
Date: Wed, 8 Nov 2023 18:13:18 -0800 [thread overview]
Message-ID: <20231108181318.5360af18@kernel.org> (raw)
In-Reply-To: <1699484212-24079-1-git-send-email-longli@linuxonhyperv.com>
On Wed, 8 Nov 2023 14:56:52 -0800 longli@linuxonhyperv•com wrote:
> From: Long Li <longli@microsoft•com>
>
> When a VF is being exposed form the kernel, it should be marked as "slave"
> before exposing to the user-mode. The VF is not usable without netvsc running
> as master. The user-mode should never see a VF without the "slave" flag.
>
> An example of a user-mode program depending on this flag is cloud-init
> (https://github.com/canonical/cloud-init/blob/19.3/cloudinit/net/__init__.py)
Quick grep for "flags", "priv" and "slave" doesn't show anything.
Can you point me to the line of code?
> When scanning interfaces, it checks on if this interface has a master to
> decide if it should be configured. There are other user-mode programs perform
> similar checks.
>
> This commit moves the code of setting the slave flag to the time before VF is
> exposed to user-mode.
> Change since v3:
> Change target to net-next.
You don't consider this a fix? It seems like a race condition.
> - if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr)) {
> - netdev_notice(vf_netdev,
> - "falling back to mac addr based matching\n");
> + if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr) ||
> + ether_addr_equal(vf_netdev->dev_addr, ndev->perm_addr))
This change doesn't seem to be described in the commit message.
Please note that we have a rule against reposting patches within 24h:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#resending-after-review
next prev parent reply other threads:[~2023-11-09 2:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-08 22:56 [PATCH net-next v4] hv_netvsc: Mark VF as slave before exposing it to user-mode longli
2023-11-09 2:13 ` Jakub Kicinski [this message]
2023-11-10 0:43 ` Long Li
2023-11-10 20:05 ` Jakub Kicinski
2023-11-15 16:14 ` Stephen Hemminger
2023-11-18 17:38 ` Jakub Kicinski
2023-11-21 0:23 ` Long Li
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