> > > I'll post few comments to v4 here. > > > > > static int > > > +dpdk_attach_vhost_pmd(struct netdev_dpdk *dev, int mode) > > > +{ > > > + char *devargs; > > > + int err = 0; > > > + uint8_t port_no = 0; > > > + uint32_t driver_id = -1; > > > + > > > + if (id_pool_alloc_id(dpdk_get_vhost_id_pool(), &driver_id)) { > > > + devargs = xasprintf("net_vhost%u,iface=%s,queues=%i,client=%i", > > > + driver_id, dev->vhost_id, > > > + MIN(OVS_VHOST_MAX_QUEUE_NUM, > > RTE_MAX_QUEUES_PER_PORT), > > > + mode); > > > + err = rte_eth_dev_attach(devargs, &port_no); > > > + if (!err) { > > > + dev->port_id = port_no; > > > + dev->vhost_pmd_id = driver_id; > > > + } else { > > > > id should be freed on error. > > Fixed in v5 > > > > > > + VLOG_ERR("Failed to attach vhost-user device %s to DPDK", > > > + dev->vhost_id); > > > + } > > > + } else { > > > + VLOG_ERR("Unable to create vhost-user device %s - too many > vhost- > > user" > > > + "devices registered with PMD", dev->vhost_id); > > > + err = ENODEV; > > > + } > > > + > > > + return err; > > > +} > > > > -------------- > > > > > static void > > > netdev_dpdk_vhost_destruct(struct netdev *netdev) > > > { > > > struct netdev_dpdk *dev = netdev_dpdk_cast(netdev); > > > - char *vhost_id; > > > > > > ovs_mutex_lock(&dpdk_mutex); > > > ovs_mutex_lock(&dev->mutex); > > > > > > - /* Guest becomes an orphan if still attached. */ > > > - if (netdev_dpdk_get_vid(dev) >= 0 > > > - && !(dev->vhost_driver_flags & RTE_VHOST_USER_CLIENT)) { > > > - VLOG_ERR("Removing port '%s' while vhost device still attached.", > > > - netdev->name); > > > - VLOG_ERR("To restore connectivity after re-adding of port, VM on > > > " > > > - "socket '%s' must be restarted.", dev->vhost_id); > > > > These log messages are useful. I think it's better to keep them somehow. > > Maybe we can check for link status here? > > Sure > > > > > > + if (rte_eth_dev_detach(dev->port_id, dev->vhost_id)) { > > > > 'rte_eth_dev_detach()' will call 'dpdk_vhost_driver_unregister()' and > > this will lead to link status change if vhost still attached. > > And as soon as 'dpdk_mutex' and 'dev->mutex' are taken, there will be > > deadlock > > inside the callback. > > > > See 3f891bbea61d ("netdev-dpdk: Fix deadlock in destroy_device().") for > > details. > > > > The problem here is that we can't call 'rte_eth_dev_detach()' without 'dev- > > >mutex'. > > Ok got it - I'm posting a v5 without this fix. Expect it in the v6. Not sure > how to > approach it just yet.
We might be ok here actually. The LSC callback to OVS where we try to acquire the mutex a second time will not occur after rte_eth_dev_detach(). We will fail in DPDK before then: DPDK: rte_eth_vhost.c: static void destroy_device(int vid) { ..... rte_vhost_get_ifname(vid, ifname, sizeof(ifname)); list = find_internal_resource(ifname); <--- port was removed from list during detach if (list == NULL) { RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname); return; <--- we fail here } ..... callback_to_ovs_lsc(); <--- we never reach this } Thanks, Ciara > > > > > > + VLOG_ERR("Error removing vhost device %s", dev->vhost_id); > > > + } else { > > > + if (dev->type == DPDK_DEV_VHOST) { > > > > "} else if {" ? > > > > > + fatal_signal_remove_file_to_unlink(dev->vhost_id); > > > + } > > > } > > > + id_pool_free_id(dpdk_get_vhost_id_pool(), dev->vhost_pmd_id); > > > > I guess, that It's better to call 'free()' only if id was allocated. > > I will introduce a check in v5. > > > > > > > > > - free(ovsrcu_get_protected(struct ingress_policer *, > > > - &dev->ingress_policer)); > > > - > > > - rte_free(dev->tx_q); > > > - ovs_list_remove(&dev->list_node); > > > - dpdk_mp_put(dev->dpdk_mp); > > > - > > > - vhost_id = xstrdup(dev->vhost_id); > > > + dpdk_destruct_helper(dev); > > > > > > ovs_mutex_unlock(&dev->mutex); > > > ovs_mutex_unlock(&dpdk_mutex); > > > - > > > - if (dpdk_vhost_driver_unregister(dev, vhost_id)) { > > > - VLOG_ERR("%s: Unable to unregister vhost driver for socket > '%s'.\n", > > > - netdev->name, vhost_id); > > > - } else if (!(dev->vhost_driver_flags & RTE_VHOST_USER_CLIENT)) { > > > - /* OVS server mode - remove this socket from list for deletion */ > > > - fatal_signal_remove_file_to_unlink(vhost_id); > > > - } > > > - free(vhost_id); > > > } > > > > Best regards, Ilya Maximets. _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev