From: Simon Horman <simon.horman@corigine.com>
To: souradeep chakrabarti <schakrabarti@linux.microsoft.com>
Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, longli@microsoft.com,
sharmaajay@microsoft.com, leon@kernel.org, cai.huoqing@linux.dev,
ssengar@linux.microsoft.com, vkuznets@redhat.com,
tglx@linutronix.de, linux-hyperv@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-rdma@vger.kernel.org, stable@vger.kernel.org,
schakrabarti@microsoft.com
Subject: Re: [PATCH V2 net] net: mana: Fix MANA VF unload when host is unresponsive
Date: Fri, 23 Jun 2023 19:44:18 +0200 [thread overview]
Message-ID: <ZJXZ8mg5uw8MaKuP@corigine.com> (raw)
In-Reply-To: <1687505355-29212-1-git-send-email-schakrabarti@linux.microsoft.com>
On Fri, Jun 23, 2023 at 12:29:15AM -0700, souradeep chakrabarti wrote:
> From: Souradeep Chakrabarti <schakrabarti@linux.microsoft.com>
>
> This patch addresses the VF unload issue, where mana_dealloc_queues()
> gets stuck in infinite while loop, because of host unresponsiveness.
> It adds a timeout in the while loop, to fix it.
>
> Also this patch adds a new attribute in mana_context, which gets set when
> mana_hwc_send_request() hits a timeout because of host unresponsiveness.
> This flag then helps to avoid the timeouts in successive calls.
>
> Signed-off-by: Souradeep Chakrabarti <schakrabarti@linux.microsoft.com>
...
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index d907727c7b7a..cb2080b3a00c 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
...
> @@ -2348,13 +2351,26 @@ static int mana_dealloc_queues(struct net_device *ndev)
> *
> * Drain all the in-flight TX packets
> */
> +
> + timeout = jiffies + 120 * HZ;
> for (i = 0; i < apc->num_queues; i++) {
> txq = &apc->tx_qp[i].txq;
> -
> - while (atomic_read(&txq->pending_sends) > 0)
> + while (atomic_read(&txq->pending_sends) > 0 &&
> + time_before(jiffies, timeout)) {
> usleep_range(1000, 2000);
> + }
Hi Souradeep,
minor feedback from my side, as it seems there will be a new version anyway:
I think the braces - '{' '}' - are unnecessary above.
...
--
pw-bot: cr
prev parent reply other threads:[~2023-06-23 17:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-23 7:29 [PATCH V2 net] net: mana: Fix MANA VF unload when host is unresponsive souradeep chakrabarti
2023-06-23 9:43 ` Jiri Pirko
2023-06-23 17:44 ` Simon Horman [this message]
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