On Fri, Nov 09, 2018 at 07:24:55AM -0500, Eelco Chaudron wrote:
> When the netdev link flags are changed, !NETDEV_UP, the DPDK ports are not
> actually going down. This is causing problems for people trying to bring
> down a bond member. The bond link is no longer being used to receive or
> transmit traffic, however, the other end keeps sending data as the link
> remains up.
>
> With OVS 2.6 the link was brought down, and this was changed with commit
> 3b1fb0779. In this commit, it's explicitly mentioned that the link down/up
> DPDK APIs are not called as not all PMD devices support it.
>
> However, this patch does call the appropriate DPDK APIs and ignoring
> errors due to the PMD not supporting it. PMDs not supporting this should
> be fixed in DPDK upstream.
>
> I verified this patch is working correctly using the
> ovs-appctl netdev-dpdk/set-admin-state <port> {up|down} and
> ovs-ofctl mod-port <bridge> <port> {up|down} commands on a XL710
> and 82599ES.
>
> Fixes: 3b1fb0779b87 ("netdev-dpdk: Don't call rte_dev_stop() in
> update_flags().")
> Signed-off-by: Eelco Chaudron <echau...@redhat.com>
>
> ---
> * V4:
> - Use netdev_get_name() instead of dev->up.name directly
>
> * V3:
> - Update log message and changed the level to INFO
>
> * V2:
> - Only call link state change function if the upstate changed
> - Restore original flags on error
> - Log a message when the NIC does not support the link state API
>
> lib/netdev-dpdk.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
> index 7e0a593..00f5acc 100644
> --- a/lib/netdev-dpdk.c
> +++ b/lib/netdev-dpdk.c
> @@ -2942,6 +2942,24 @@ netdev_dpdk_update_flags__(struct netdev_dpdk *dev,
> }
>
> if (dev->type == DPDK_DEV_ETH) {
> +
> + if ((dev->flags ^ *old_flagsp) & NETDEV_UP) {
> + int err;
> +
> + if (dev->flags & NETDEV_UP) {
> + err = rte_eth_dev_set_link_up(dev->port_id);
> + } else {
> + err = rte_eth_dev_set_link_down(dev->port_id);
> + }
> + if (err == -ENOTSUP) {
> + VLOG_INFO("Interface %s does not support link state "
> + "configuration", netdev_get_name(&dev->up));
> + } else if (err < 0) {
The netdev_dpdk_set_admin_state__() ignores the return value so we
won't know if the there is a problem or not.
Maybe worth to fix the caller or add a msg here too?
(sorry to come up late)
fbl
> + dev->flags = *old_flagsp;
> + return -err;
> + }
> + }
> +
> if (dev->flags & NETDEV_PROMISC) {
> rte_eth_promiscuous_enable(dev->port_id);
> }
>
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--
Flavio
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