From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: zhiyong.yang@intel.com, dev@dpdk.org
Cc: jianfeng.tan@intel.com, zhihong.wang@intel.com,
thomas@monjalon.net, dong1.wang@intel.com, tiwei.bie@intel.com
Subject: Re: [dpdk-dev] [PATCH v3 4/4] net/vhost: add NULL pointer checking
Date: Thu, 29 Mar 2018 15:19:43 +0200 [thread overview]
Message-ID: <1b93fd09-9802-bff7-bea4-5b4839860983@redhat.com> (raw)
In-Reply-To: <20180321030343.64399-5-zhiyong.yang@intel.com>
Hi,
On 03/21/2018 04:03 AM, zhiyong.yang@intel.com wrote:
> When vhost user PMD works in client mode to connect/reconnect virtio-user
> with server mode, new thread sometimes may run to new_device before
> queue_setup has been done, So have to wait until memory allocation is
> done.
>
> Release note is updated in the patch.
>
> Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
> ---
> doc/guides/rel_notes/release_18_05.rst | 7 +++++++
> drivers/net/vhost/rte_eth_vhost.c | 9 +++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/doc/guides/rel_notes/release_18_05.rst b/doc/guides/rel_notes/release_18_05.rst
> index 3923dc253..7b301f021 100644
> --- a/doc/guides/rel_notes/release_18_05.rst
> +++ b/doc/guides/rel_notes/release_18_05.rst
> @@ -41,6 +41,13 @@ New Features
> Also, make sure to start the actual text at the margin.
> =========================================================
>
> +* **Added support for virtio-user server mode.**
> +
> + In a container environment if the vhost-user backend restarts, there's no way
> + for it to reconnect to virtio-user. To address this, support for server mode
> + is added. In this mode the socket file is created by virtio-user, which the
> + backend then connects to. This means that if the backend restarts, it can
> + reconnect to virtio-user and continue communications.
I think this shouldn't be part of this patch.
>
> API Changes
> -----------
> diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
> index 3aae01c39..2490bad0b 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -580,6 +580,15 @@ new_device(int vid)
> eth_dev->data->numa_node = newnode;
> #endif
>
> + /* The thread may run here before eth_dev->data->rx_queues or
> + * eth_dev->data->tx_queues have gotten valid memory, so have to
> + * wait until memory allocation is done.
> + */
> + while (!eth_dev->data->rx_queues ||
> + !eth_dev->data->tx_queues) {
> + usleep(1);
> + }
> +
> for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
> vq = eth_dev->data->rx_queues[i];
> if (vq == NULL)
>
I don't like the idea of polling here.
It looks like Junjie is addressing the problem in a different way [0],
do you confirm it would work in your case?
Thanks,
Maxime
[0]: http://dpdk.org/dev/patchwork/patch/36643/
next prev parent reply other threads:[~2018-03-29 13:19 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-14 14:53 [dpdk-dev] [PATCH 0/4] add to support for virtio-user server mode Zhiyong Yang
2018-02-14 14:53 ` [dpdk-dev] [PATCH 1/4] vhost: move fdset functions from fd_man.c to fd_man.h Zhiyong Yang
2018-02-27 17:51 ` Maxime Coquelin
2018-02-28 1:36 ` Yang, Zhiyong
2018-02-28 8:45 ` Maxime Coquelin
2018-03-01 6:02 ` Tan, Jianfeng
2018-03-01 14:13 ` Thomas Monjalon
2018-03-05 7:43 ` Yang, Zhiyong
2018-03-05 8:54 ` Thomas Monjalon
2018-03-13 8:46 ` Yang, Zhiyong
[not found] ` <9059097.ABoCBN0gVk@xps>
2018-03-13 9:50 ` Yang, Zhiyong
2018-03-15 9:32 ` Thomas Monjalon
2018-03-16 8:43 ` Yang, Zhiyong
2018-03-21 6:51 ` Yang, Zhiyong
2018-03-15 9:45 ` [dpdk-dev] [PATCH v2 0/5] add support for virtio-user server mode zhiyong.yang
2018-03-15 9:45 ` [dpdk-dev] [PATCH v2 1/5] net/virtio: fix add pointer checking zhiyong.yang
2018-03-15 9:45 ` [dpdk-dev] [PATCH v2 2/5] net/virtio: add checking for cvq zhiyong.yang
2018-03-15 9:45 ` [dpdk-dev] [PATCH v2 3/5] eal: expose fdset related APIs zhiyong.yang
2018-03-15 9:45 ` [dpdk-dev] [PATCH v2 4/5] net/virtio-user: add support for server mode zhiyong.yang
2018-03-15 9:45 ` [dpdk-dev] [PATCH v2 5/5] net/vhost: add memory checking zhiyong.yang
2018-02-14 14:53 ` [dpdk-dev] [PATCH 2/4] net/virtio-user: add data members to support server mode Zhiyong Yang
2018-02-27 17:53 ` Maxime Coquelin
2018-02-28 1:38 ` Yang, Zhiyong
2018-02-14 14:53 ` [dpdk-dev] [PATCH 3/4] net/virtio-user: " Zhiyong Yang
2018-02-27 18:01 ` Maxime Coquelin
2018-02-28 1:53 ` Yang, Zhiyong
2018-02-28 8:33 ` Maxime Coquelin
2018-02-14 14:53 ` [dpdk-dev] [PATCH 4/4] net/vhost: add memory checking to support client mode Zhiyong Yang
2018-03-21 3:03 ` [dpdk-dev] [PATCH v3 0/4] add support for virtio-user server mode zhiyong.yang
2018-03-21 3:03 ` [dpdk-dev] [PATCH v3 1/4] net/virtio: fix add pointer checking zhiyong.yang
2018-03-28 7:26 ` Tan, Jianfeng
2018-03-28 7:48 ` Yang, Zhiyong
2018-03-29 11:59 ` Maxime Coquelin
2018-03-29 12:01 ` Maxime Coquelin
2018-03-21 3:03 ` [dpdk-dev] [PATCH v3 2/4] net/virtio: add checking for cvq zhiyong.yang
2018-03-28 8:34 ` Tan, Jianfeng
2018-03-29 11:59 ` Maxime Coquelin
2018-03-29 12:06 ` Maxime Coquelin
2018-03-21 3:03 ` [dpdk-dev] [PATCH v3 3/4] net/virtio-user: add support for server mode zhiyong.yang
2018-03-28 15:14 ` Tan, Jianfeng
2018-03-30 2:08 ` Yang, Zhiyong
2018-03-21 3:03 ` [dpdk-dev] [PATCH v3 4/4] net/vhost: add NULL pointer checking zhiyong.yang
2018-03-29 13:19 ` Maxime Coquelin [this message]
2018-03-30 2:00 ` Yang, Zhiyong
2018-03-30 7:41 ` Yang, Zhiyong
2018-04-03 12:20 ` [dpdk-dev] [PATCH v4 0/1] server mode virtio-user zhiyong.yang
2018-04-03 12:20 ` [dpdk-dev] [PATCH v4 1/1] net/virtio-user: add support for server mode zhiyong.yang
2018-04-03 15:16 ` Tan, Jianfeng
2018-04-04 3:31 ` Yang, Zhiyong
2018-04-04 3:47 ` Tan, Jianfeng
2018-04-04 5:37 ` Tiwei Bie
2018-04-04 9:59 ` Yang, Zhiyong
2018-04-04 14:57 ` Yang, Zhiyong
2018-04-04 17:17 ` [dpdk-dev] [PATCH v5] " zhiyong.yang
2018-04-05 8:29 ` Tiwei Bie
2018-04-05 9:19 ` Yang, Zhiyong
2018-04-06 7:22 ` Yang, Zhiyong
2018-04-05 9:21 ` Yang, Zhiyong
2018-04-06 0:18 ` [dpdk-dev] [PATCH v6] " zhiyong.yang
2018-04-05 18:13 ` Tan, Jianfeng
2018-04-06 7:14 ` Yang, Zhiyong
2018-04-06 9:25 ` [dpdk-dev] [PATCH v7] " zhiyong.yang
2018-04-08 0:36 ` Tan, Jianfeng
2018-04-10 11:55 ` Maxime Coquelin
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