Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Paul Durrant | 2145 | 41.68% | 16 | 23.19% |
Ian Campbell | 967 | 18.79% | 3 | 4.35% |
Zoltan Kiss | 767 | 14.90% | 5 | 7.25% |
Wei Liu | 346 | 6.72% | 7 | 10.14% |
Imre Palik | 225 | 4.37% | 3 | 4.35% |
Andrew J. Bennieston | 189 | 3.67% | 1 | 1.45% |
Jeremy Fitzhardinge | 104 | 2.02% | 1 | 1.45% |
Denis Kirjanov | 104 | 2.02% | 1 | 1.45% |
David Vrabel | 76 | 1.48% | 6 | 8.70% |
Igor Druzhinin | 70 | 1.36% | 3 | 4.35% |
Juergen Gross | 38 | 0.74% | 2 | 2.90% |
SeongJae Park | 34 | 0.66% | 2 | 2.90% |
Filipe Manco | 18 | 0.35% | 1 | 1.45% |
Alexey Khoroshilov | 15 | 0.29% | 1 | 1.45% |
Insu Yun | 12 | 0.23% | 1 | 1.45% |
Jan Beulich | 7 | 0.14% | 3 | 4.35% |
Yangtao Li | 5 | 0.10% | 1 | 1.45% |
Gustavo A. R. Silva | 3 | 0.06% | 1 | 1.45% |
Arnd Bergmann | 3 | 0.06% | 1 | 1.45% |
Josh Boyer | 3 | 0.06% | 1 | 1.45% |
Kees Cook | 3 | 0.06% | 1 | 1.45% |
Joe Perches | 2 | 0.04% | 1 | 1.45% |
Thomas Gleixner | 2 | 0.04% | 1 | 1.45% |
Dongli Zhang | 2 | 0.04% | 1 | 1.45% |
Lee Jones | 2 | 0.04% | 1 | 1.45% |
Chi Minghao | 1 | 0.02% | 1 | 1.45% |
Dawei Li | 1 | 0.02% | 1 | 1.45% |
Greg Kroah-Hartman | 1 | 0.02% | 1 | 1.45% |
Marek Marczykowski-Górecki | 1 | 0.02% | 1 | 1.45% |
Total | 5146 | 69 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Xenbus code for netif backend * * Copyright (C) 2005 Rusty Russell <rusty@rustcorp.com.au> * Copyright (C) 2005 XenSource Ltd */ #include "common.h" #include <linux/vmalloc.h> #include <linux/rtnetlink.h> static int connect_data_rings(struct backend_info *be, struct xenvif_queue *queue); static void connect(struct backend_info *be); static int read_xenbus_vif_flags(struct backend_info *be); static int backend_create_xenvif(struct backend_info *be); static void unregister_hotplug_status_watch(struct backend_info *be); static void xen_unregister_watchers(struct xenvif *vif); static void set_backend_state(struct backend_info *be, enum xenbus_state state); #ifdef CONFIG_DEBUG_FS struct dentry *xen_netback_dbg_root = NULL; static int xenvif_read_io_ring(struct seq_file *m, void *v) { struct xenvif_queue *queue = m->private; struct xen_netif_tx_back_ring *tx_ring = &queue->tx; struct xen_netif_rx_back_ring *rx_ring = &queue->rx; struct netdev_queue *dev_queue; if (tx_ring->sring) { struct xen_netif_tx_sring *sring = tx_ring->sring; seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id, tx_ring->nr_ents); seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", sring->req_prod, sring->req_prod - sring->rsp_prod, tx_ring->req_cons, tx_ring->req_cons - sring->rsp_prod, sring->req_event, sring->req_event - sring->rsp_prod); seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n", sring->rsp_prod, tx_ring->rsp_prod_pvt, tx_ring->rsp_prod_pvt - sring->rsp_prod, sring->rsp_event, sring->rsp_event - sring->rsp_prod); seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n", queue->pending_prod, queue->pending_cons, nr_pending_reqs(queue)); seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n", queue->dealloc_prod, queue->dealloc_cons, queue->dealloc_prod - queue->dealloc_cons); } if (rx_ring->sring) { struct xen_netif_rx_sring *sring = rx_ring->sring; seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents); seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", sring->req_prod, sring->req_prod - sring->rsp_prod, rx_ring->req_cons, rx_ring->req_cons - sring->rsp_prod, sring->req_event, sring->req_event - sring->rsp_prod); seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n", sring->rsp_prod, rx_ring->rsp_prod_pvt, rx_ring->rsp_prod_pvt - sring->rsp_prod, sring->rsp_event, sring->rsp_event - sring->rsp_prod); } seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n" "Credit timer_pending: %d, credit: %lu, usec: %lu\n" "remaining: %lu, expires: %lu, now: %lu\n", queue->napi.state, queue->napi.weight, skb_queue_len(&queue->tx_queue), timer_pending(&queue->credit_timeout), queue->credit_bytes, queue->credit_usec, queue->remaining_credit, queue->credit_timeout.expires, jiffies); dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id); seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n", queue->rx_queue_len, queue->rx_queue_max, skb_queue_len(&queue->rx_queue), netif_tx_queue_stopped(dev_queue) ? "stopped" : "running"); return 0; } #define XENVIF_KICK_STR "kick" #define BUFFER_SIZE 32 static ssize_t xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count, loff_t *ppos) { struct xenvif_queue *queue = ((struct seq_file *)filp->private_data)->private; int len; char write[BUFFER_SIZE]; /* don't allow partial writes and check the length */ if (*ppos != 0) return 0; if (count >= sizeof(write)) return -ENOSPC; len = simple_write_to_buffer(write, sizeof(write) - 1, ppos, buf, count); if (len < 0) return len; write[len] = '\0'; if (!strncmp(write, XENVIF_KICK_STR, sizeof(XENVIF_KICK_STR) - 1)) xenvif_interrupt(0, (void *)queue); else { pr_warn("Unknown command to io_ring_q%d. Available: kick\n", queue->id); count = -EINVAL; } return count; } static int xenvif_io_ring_open(struct inode *inode, struct file *filp) { int ret; void *queue = NULL; if (inode->i_private) queue = inode->i_private; ret = single_open(filp, xenvif_read_io_ring, queue); filp->f_mode |= FMODE_PWRITE; return ret; } static const struct file_operations xenvif_dbg_io_ring_ops_fops = { .owner = THIS_MODULE, .open = xenvif_io_ring_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .write = xenvif_write_io_ring, }; static int xenvif_ctrl_show(struct seq_file *m, void *v) { struct xenvif *vif = m->private; xenvif_dump_hash_info(vif, m); return 0; } DEFINE_SHOW_ATTRIBUTE(xenvif_ctrl); static void xenvif_debugfs_addif(struct xenvif *vif) { int i; vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name, xen_netback_dbg_root); for (i = 0; i < vif->num_queues; ++i) { char filename[sizeof("io_ring_q") + 4]; snprintf(filename, sizeof(filename), "io_ring_q%d", i); debugfs_create_file(filename, 0600, vif->xenvif_dbg_root, &vif->queues[i], &xenvif_dbg_io_ring_ops_fops); } if (vif->ctrl_irq) debugfs_create_file("ctrl", 0400, vif->xenvif_dbg_root, vif, &xenvif_ctrl_fops); } static void xenvif_debugfs_delif(struct xenvif *vif) { debugfs_remove_recursive(vif->xenvif_dbg_root); vif->xenvif_dbg_root = NULL; } #endif /* CONFIG_DEBUG_FS */ /* * Handle the creation of the hotplug script environment. We add the script * and vif variables to the environment, for the benefit of the vif-* hotplug * scripts. */ static int netback_uevent(const struct xenbus_device *xdev, struct kobj_uevent_env *env) { struct backend_info *be = dev_get_drvdata(&xdev->dev); if (!be) return 0; if (add_uevent_var(env, "script=%s", be->hotplug_script)) return -ENOMEM; if (!be->vif) return 0; return add_uevent_var(env, "vif=%s", be->vif->dev->name); } static int backend_create_xenvif(struct backend_info *be) { int err; long handle; struct xenbus_device *dev = be->dev; struct xenvif *vif; if (be->vif != NULL) return 0; err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); if (err != 1) { xenbus_dev_fatal(dev, err, "reading handle"); return (err < 0) ? err : -EINVAL; } vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); if (IS_ERR(vif)) { err = PTR_ERR(vif); xenbus_dev_fatal(dev, err, "creating interface"); return err; } be->vif = vif; vif->be = be; kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); return 0; } static void backend_disconnect(struct backend_info *be) { struct xenvif *vif = be->vif; if (vif) { unsigned int num_queues = vif->num_queues; unsigned int queue_index; xen_unregister_watchers(vif); #ifdef CONFIG_DEBUG_FS xenvif_debugfs_delif(vif); #endif /* CONFIG_DEBUG_FS */ xenvif_disconnect_data(vif); /* At this point some of the handlers may still be active * so we need to have additional synchronization here. */ vif->num_queues = 0; synchronize_net(); for (queue_index = 0; queue_index < num_queues; ++queue_index) xenvif_deinit_queue(&vif->queues[queue_index]); vfree(vif->queues); vif->queues = NULL; xenvif_disconnect_ctrl(vif); } } static void backend_connect(struct backend_info *be) { if (be->vif) connect(be); } static inline void backend_switch_state(struct backend_info *be, enum xenbus_state state) { struct xenbus_device *dev = be->dev; pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); be->state = state; /* If we are waiting for a hotplug script then defer the * actual xenbus state change. */ if (!be->have_hotplug_status_watch) xenbus_switch_state(dev, state); } /* Handle backend state transitions: * * The backend state starts in Initialising and the following transitions are * allowed. * * Initialising -> InitWait -> Connected * \ * \ ^ \ | * \ | \ | * \ | \ | * \ | \ | * \ | \ | * \ | \ | * V | V V * * Closed <-> Closing * * The state argument specifies the eventual state of the backend and the * function transitions to that state via the shortest path. */ static void set_backend_state(struct backend_info *be, enum xenbus_state state) { while (be->state != state) { switch (be->state) { case XenbusStateInitialising: switch (state) { case XenbusStateInitWait: case XenbusStateConnected: case XenbusStateClosing: backend_switch_state(be, XenbusStateInitWait); break; case XenbusStateClosed: backend_switch_state(be, XenbusStateClosed); break; default: BUG(); } break; case XenbusStateClosed: switch (state) { case XenbusStateInitWait: case XenbusStateConnected: backend_switch_state(be, XenbusStateInitWait); break; case XenbusStateClosing: backend_switch_state(be, XenbusStateClosing); break; default: BUG(); } break; case XenbusStateInitWait: switch (state) { case XenbusStateConnected: backend_connect(be); backend_switch_state(be, XenbusStateConnected); break; case XenbusStateClosing: case XenbusStateClosed: backend_switch_state(be, XenbusStateClosing); break; default: BUG(); } break; case XenbusStateConnected: switch (state) { case XenbusStateInitWait: case XenbusStateClosing: case XenbusStateClosed: backend_disconnect(be); backend_switch_state(be, XenbusStateClosing); break; default: BUG(); } break; case XenbusStateClosing: switch (state) { case XenbusStateInitWait: case XenbusStateConnected: case XenbusStateClosed: backend_switch_state(be, XenbusStateClosed); break; default: BUG(); } break; default: BUG(); } } } static void read_xenbus_frontend_xdp(struct backend_info *be, struct xenbus_device *dev) { struct xenvif *vif = be->vif; u16 headroom; int err; err = xenbus_scanf(XBT_NIL, dev->otherend, "xdp-headroom", "%hu", &headroom); if (err != 1) { vif->xdp_headroom = 0; return; } if (headroom > XEN_NETIF_MAX_XDP_HEADROOM) headroom = XEN_NETIF_MAX_XDP_HEADROOM; vif->xdp_headroom = headroom; } /* * Callback received when the frontend's state changes. */ static void frontend_changed(struct xenbus_device *dev, enum xenbus_state frontend_state) { struct backend_info *be = dev_get_drvdata(&dev->dev); pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); be->frontend_state = frontend_state; switch (frontend_state) { case XenbusStateInitialising: set_backend_state(be, XenbusStateInitWait); break; case XenbusStateInitialised: break; case XenbusStateConnected: set_backend_state(be, XenbusStateConnected); break; case XenbusStateReconfiguring: read_xenbus_frontend_xdp(be, dev); xenbus_switch_state(dev, XenbusStateReconfigured); break; case XenbusStateClosing: set_backend_state(be, XenbusStateClosing); break; case XenbusStateClosed: set_backend_state(be, XenbusStateClosed); if (xenbus_dev_is_online(dev)) break; fallthrough; /* if not online */ case XenbusStateUnknown: set_backend_state(be, XenbusStateClosed); device_unregister(&dev->dev); break; default: xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", frontend_state); break; } } static void xen_net_read_rate(struct xenbus_device *dev, unsigned long *bytes, unsigned long *usec) { char *s, *e; unsigned long b, u; char *ratestr; /* Default to unlimited bandwidth. */ *bytes = ~0UL; *usec = 0; ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); if (IS_ERR(ratestr)) return; s = ratestr; b = simple_strtoul(s, &e, 10); if ((s == e) || (*e != ',')) goto fail; s = e + 1; u = simple_strtoul(s, &e, 10); if ((s == e) || (*e != '\0')) goto fail; *bytes = b; *usec = u; kfree(ratestr); return; fail: pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); kfree(ratestr); } static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) { char *s, *e, *macstr; int i; macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); if (IS_ERR(macstr)) return PTR_ERR(macstr); for (i = 0; i < ETH_ALEN; i++) { mac[i] = simple_strtoul(s, &e, 16); if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { kfree(macstr); return -ENOENT; } s = e+1; } kfree(macstr); return 0; } static void xen_net_rate_changed(struct xenbus_watch *watch, const char *path, const char *token) { struct xenvif *vif = container_of(watch, struct xenvif, credit_watch); struct xenbus_device *dev = xenvif_to_xenbus_device(vif); unsigned long credit_bytes; unsigned long credit_usec; unsigned int queue_index; xen_net_read_rate(dev, &credit_bytes, &credit_usec); for (queue_index = 0; queue_index < vif->num_queues; queue_index++) { struct xenvif_queue *queue = &vif->queues[queue_index]; queue->credit_bytes = credit_bytes; queue->credit_usec = credit_usec; if (!mod_timer_pending(&queue->credit_timeout, jiffies) && queue->remaining_credit > queue->credit_bytes) { queue->remaining_credit = queue->credit_bytes; } } } static int xen_register_credit_watch(struct xenbus_device *dev, struct xenvif *vif) { int err = 0; char *node; unsigned maxlen = strlen(dev->nodename) + sizeof("/rate"); if (vif->credit_watch.node) return -EADDRINUSE; node = kmalloc(maxlen, GFP_KERNEL); if (!node) return -ENOMEM; snprintf(node, maxlen, "%s/rate", dev->nodename); vif->credit_watch.node = node; vif->credit_watch.will_handle = NULL; vif->credit_watch.callback = xen_net_rate_changed; err = register_xenbus_watch(&vif->credit_watch); if (err) { pr_err("Failed to set watcher %s\n", vif->credit_watch.node); kfree(node); vif->credit_watch.node = NULL; vif->credit_watch.will_handle = NULL; vif->credit_watch.callback = NULL; } return err; } static void xen_unregister_credit_watch(struct xenvif *vif) { if (vif->credit_watch.node) { unregister_xenbus_watch(&vif->credit_watch); kfree(vif->credit_watch.node); vif->credit_watch.node = NULL; } } static void xen_mcast_ctrl_changed(struct xenbus_watch *watch, const char *path, const char *token) { struct xenvif *vif = container_of(watch, struct xenvif, mcast_ctrl_watch); struct xenbus_device *dev = xenvif_to_xenbus_device(vif); vif->multicast_control = !!xenbus_read_unsigned(dev->otherend, "request-multicast-control", 0); } static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev, struct xenvif *vif) { int err = 0; char *node; unsigned maxlen = strlen(dev->otherend) + sizeof("/request-multicast-control"); if (vif->mcast_ctrl_watch.node) { pr_err_ratelimited("Watch is already registered\n"); return -EADDRINUSE; } node = kmalloc(maxlen, GFP_KERNEL); if (!node) { pr_err("Failed to allocate memory for watch\n"); return -ENOMEM; } snprintf(node, maxlen, "%s/request-multicast-control", dev->otherend); vif->mcast_ctrl_watch.node = node; vif->mcast_ctrl_watch.will_handle = NULL; vif->mcast_ctrl_watch.callback = xen_mcast_ctrl_changed; err = register_xenbus_watch(&vif->mcast_ctrl_watch); if (err) { pr_err("Failed to set watcher %s\n", vif->mcast_ctrl_watch.node); kfree(node); vif->mcast_ctrl_watch.node = NULL; vif->mcast_ctrl_watch.will_handle = NULL; vif->mcast_ctrl_watch.callback = NULL; } return err; } static void xen_unregister_mcast_ctrl_watch(struct xenvif *vif) { if (vif->mcast_ctrl_watch.node) { unregister_xenbus_watch(&vif->mcast_ctrl_watch); kfree(vif->mcast_ctrl_watch.node); vif->mcast_ctrl_watch.node = NULL; } } static void xen_register_watchers(struct xenbus_device *dev, struct xenvif *vif) { xen_register_credit_watch(dev, vif); xen_register_mcast_ctrl_watch(dev, vif); } static void xen_unregister_watchers(struct xenvif *vif) { xen_unregister_mcast_ctrl_watch(vif); xen_unregister_credit_watch(vif); } static void unregister_hotplug_status_watch(struct backend_info *be) { if (be->have_hotplug_status_watch) { unregister_xenbus_watch(&be->hotplug_status_watch); kfree(be->hotplug_status_watch.node); } be->have_hotplug_status_watch = 0; } static void hotplug_status_changed(struct xenbus_watch *watch, const char *path, const char *token) { struct backend_info *be = container_of(watch, struct backend_info, hotplug_status_watch); char *str; unsigned int len; str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); if (IS_ERR(str)) return; if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { /* Complete any pending state change */ xenbus_switch_state(be->dev, be->state); /* Not interested in this watch anymore. */ unregister_hotplug_status_watch(be); } kfree(str); } static int connect_ctrl_ring(struct backend_info *be) { struct xenbus_device *dev = be->dev; struct xenvif *vif = be->vif; unsigned int val; grant_ref_t ring_ref; unsigned int evtchn; int err; err = xenbus_scanf(XBT_NIL, dev->otherend, "ctrl-ring-ref", "%u", &val); if (err < 0) goto done; /* The frontend does not have a control ring */ ring_ref = val; err = xenbus_scanf(XBT_NIL, dev->otherend, "event-channel-ctrl", "%u", &val); if (err < 0) { xenbus_dev_fatal(dev, err, "reading %s/event-channel-ctrl", dev->otherend); goto fail; } evtchn = val; err = xenvif_connect_ctrl(vif, ring_ref, evtchn); if (err) { xenbus_dev_fatal(dev, err, "mapping shared-frame %u port %u", ring_ref, evtchn); goto fail; } done: return 0; fail: return err; } static void connect(struct backend_info *be) { int err; struct xenbus_device *dev = be->dev; unsigned long credit_bytes, credit_usec; unsigned int queue_index; unsigned int requested_num_queues; struct xenvif_queue *queue; /* Check whether the frontend requested multiple queues * and read the number requested. */ requested_num_queues = xenbus_read_unsigned(dev->otherend, "multi-queue-num-queues", 1); if (requested_num_queues > xenvif_max_queues) { /* buggy or malicious guest */ xenbus_dev_fatal(dev, -EINVAL, "guest requested %u queues, exceeding the maximum of %u.", requested_num_queues, xenvif_max_queues); return; } err = xen_net_read_mac(dev, be->vif->fe_dev_addr); if (err) { xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); return; } xen_net_read_rate(dev, &credit_bytes, &credit_usec); xen_unregister_watchers(be->vif); xen_register_watchers(dev, be->vif); read_xenbus_vif_flags(be); err = connect_ctrl_ring(be); if (err) { xenbus_dev_fatal(dev, err, "connecting control ring"); return; } /* Use the number of queues requested by the frontend */ be->vif->queues = vzalloc(array_size(requested_num_queues, sizeof(struct xenvif_queue))); if (!be->vif->queues) { xenbus_dev_fatal(dev, -ENOMEM, "allocating queues"); return; } be->vif->num_queues = requested_num_queues; be->vif->stalled_queues = requested_num_queues; for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) { queue = &be->vif->queues[queue_index]; queue->vif = be->vif; queue->id = queue_index; snprintf(queue->name, sizeof(queue->name), "%s-q%u", be->vif->dev->name, queue->id); err = xenvif_init_queue(queue); if (err) { /* xenvif_init_queue() cleans up after itself on * failure, but we need to clean up any previously * initialised queues. Set num_queues to i so that * earlier queues can be destroyed using the regular * disconnect logic. */ be->vif->num_queues = queue_index; goto err; } queue->credit_bytes = credit_bytes; queue->remaining_credit = credit_bytes; queue->credit_usec = credit_usec; err = connect_data_rings(be, queue); if (err) { /* connect_data_rings() cleans up after itself on * failure, but we need to clean up after * xenvif_init_queue() here, and also clean up any * previously initialised queues. */ xenvif_deinit_queue(queue); be->vif->num_queues = queue_index; goto err; } } #ifdef CONFIG_DEBUG_FS xenvif_debugfs_addif(be->vif); #endif /* CONFIG_DEBUG_FS */ /* Initialisation completed, tell core driver the number of * active queues. */ rtnl_lock(); netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues); netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues); rtnl_unlock(); xenvif_carrier_on(be->vif); unregister_hotplug_status_watch(be); err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, NULL, hotplug_status_changed, "%s/%s", dev->nodename, "hotplug-status"); if (!err) be->have_hotplug_status_watch = 1; netif_tx_wake_all_queues(be->vif->dev); return; err: if (be->vif->num_queues > 0) xenvif_disconnect_data(be->vif); /* Clean up existing queues */ for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index) xenvif_deinit_queue(&be->vif->queues[queue_index]); vfree(be->vif->queues); be->vif->queues = NULL; be->vif->num_queues = 0; xenvif_disconnect_ctrl(be->vif); return; } static int connect_data_rings(struct backend_info *be, struct xenvif_queue *queue) { struct xenbus_device *dev = be->dev; unsigned int num_queues = queue->vif->num_queues; unsigned long tx_ring_ref, rx_ring_ref; unsigned int tx_evtchn, rx_evtchn; int err; char *xspath; size_t xspathsize; const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */ /* If the frontend requested 1 queue, or we have fallen back * to single queue due to lack of frontend support for multi- * queue, expect the remaining XenStore keys in the toplevel * directory. Otherwise, expect them in a subdirectory called * queue-N. */ if (num_queues == 1) { xspath = kstrdup(dev->otherend, GFP_KERNEL); if (!xspath) { xenbus_dev_fatal(dev, -ENOMEM, "reading ring references"); return -ENOMEM; } } else { xspathsize = strlen(dev->otherend) + xenstore_path_ext_size; xspath = kzalloc(xspathsize, GFP_KERNEL); if (!xspath) { xenbus_dev_fatal(dev, -ENOMEM, "reading ring references"); return -ENOMEM; } snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, queue->id); } err = xenbus_gather(XBT_NIL, xspath, "tx-ring-ref", "%lu", &tx_ring_ref, "rx-ring-ref", "%lu", &rx_ring_ref, NULL); if (err) { xenbus_dev_fatal(dev, err, "reading %s/ring-ref", xspath); goto err; } /* Try split event channels first, then single event channel. */ err = xenbus_gather(XBT_NIL, xspath, "event-channel-tx", "%u", &tx_evtchn, "event-channel-rx", "%u", &rx_evtchn, NULL); if (err < 0) { err = xenbus_scanf(XBT_NIL, xspath, "event-channel", "%u", &tx_evtchn); if (err < 0) { xenbus_dev_fatal(dev, err, "reading %s/event-channel(-tx/rx)", xspath); goto err; } rx_evtchn = tx_evtchn; } /* Map the shared frame, irq etc. */ err = xenvif_connect_data(queue, tx_ring_ref, rx_ring_ref, tx_evtchn, rx_evtchn); if (err) { xenbus_dev_fatal(dev, err, "mapping shared-frames %lu/%lu port tx %u rx %u", tx_ring_ref, rx_ring_ref, tx_evtchn, rx_evtchn); goto err; } err = 0; err: /* Regular return falls through with err == 0 */ kfree(xspath); return err; } static int read_xenbus_vif_flags(struct backend_info *be) { struct xenvif *vif = be->vif; struct xenbus_device *dev = be->dev; unsigned int rx_copy; int err; err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", &rx_copy); if (err == -ENOENT) { err = 0; rx_copy = 0; } if (err < 0) { xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", dev->otherend); return err; } if (!rx_copy) return -EOPNOTSUPP; if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) { /* - Reduce drain timeout to poll more frequently for * Rx requests. * - Disable Rx stall detection. */ be->vif->drain_timeout = msecs_to_jiffies(30); be->vif->stall_timeout = 0; } vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0); vif->gso_mask = 0; if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0)) vif->gso_mask |= GSO_BIT(TCPV4); if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0)) vif->gso_mask |= GSO_BIT(TCPV6); vif->ip_csum = !xenbus_read_unsigned(dev->otherend, "feature-no-csum-offload", 0); vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend, "feature-ipv6-csum-offload", 0); read_xenbus_frontend_xdp(be, dev); return 0; } static void netback_remove(struct xenbus_device *dev) { struct backend_info *be = dev_get_drvdata(&dev->dev); unregister_hotplug_status_watch(be); xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); if (be->vif) { kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); backend_disconnect(be); xenvif_free(be->vif); be->vif = NULL; } kfree(be->hotplug_script); kfree(be); dev_set_drvdata(&dev->dev, NULL); } /* * Entry point to this code when a new device is created. Allocate the basic * structures and switch to InitWait. */ static int netback_probe(struct xenbus_device *dev, const struct xenbus_device_id *id) { const char *message; struct xenbus_transaction xbt; int err; int sg; const char *script; struct backend_info *be = kzalloc(sizeof(*be), GFP_KERNEL); if (!be) { xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); return -ENOMEM; } be->dev = dev; dev_set_drvdata(&dev->dev, be); sg = 1; do { err = xenbus_transaction_start(&xbt); if (err) { xenbus_dev_fatal(dev, err, "starting transaction"); goto fail; } err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); if (err) { message = "writing feature-sg"; goto abort_transaction; } err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", sg); if (err) { message = "writing feature-gso-tcpv4"; goto abort_transaction; } err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", "%d", sg); if (err) { message = "writing feature-gso-tcpv6"; goto abort_transaction; } /* We support partial checksum setup for IPv6 packets */ err = xenbus_printf(xbt, dev->nodename, "feature-ipv6-csum-offload", "%d", 1); if (err) { message = "writing feature-ipv6-csum-offload"; goto abort_transaction; } /* We support rx-copy path. */ err = xenbus_printf(xbt, dev->nodename, "feature-rx-copy", "%d", 1); if (err) { message = "writing feature-rx-copy"; goto abort_transaction; } /* we can adjust a headroom for netfront XDP processing */ err = xenbus_printf(xbt, dev->nodename, "feature-xdp-headroom", "%d", provides_xdp_headroom); if (err) { message = "writing feature-xdp-headroom"; goto abort_transaction; } /* We don't support rx-flip path (except old guests who * don't grok this feature flag). */ err = xenbus_printf(xbt, dev->nodename, "feature-rx-flip", "%d", 0); if (err) { message = "writing feature-rx-flip"; goto abort_transaction; } /* We support dynamic multicast-control. */ err = xenbus_printf(xbt, dev->nodename, "feature-multicast-control", "%d", 1); if (err) { message = "writing feature-multicast-control"; goto abort_transaction; } err = xenbus_printf(xbt, dev->nodename, "feature-dynamic-multicast-control", "%d", 1); if (err) { message = "writing feature-dynamic-multicast-control"; goto abort_transaction; } err = xenbus_transaction_end(xbt, 0); } while (err == -EAGAIN); if (err) { xenbus_dev_fatal(dev, err, "completing transaction"); goto fail; } /* Split event channels support, this is optional so it is not * put inside the above loop. */ err = xenbus_printf(XBT_NIL, dev->nodename, "feature-split-event-channels", "%u", separate_tx_rx_irq); if (err) pr_debug("Error writing feature-split-event-channels\n"); /* Multi-queue support: This is an optional feature. */ err = xenbus_printf(XBT_NIL, dev->nodename, "multi-queue-max-queues", "%u", xenvif_max_queues); if (err) pr_debug("Error writing multi-queue-max-queues\n"); err = xenbus_printf(XBT_NIL, dev->nodename, "feature-ctrl-ring", "%u", true); if (err) pr_debug("Error writing feature-ctrl-ring\n"); backend_switch_state(be, XenbusStateInitWait); script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL); if (IS_ERR(script)) { err = PTR_ERR(script); xenbus_dev_fatal(dev, err, "reading script"); goto fail; } be->hotplug_script = script; /* This kicks hotplug scripts, so do it immediately. */ err = backend_create_xenvif(be); if (err) goto fail; return 0; abort_transaction: xenbus_transaction_end(xbt, 1); xenbus_dev_fatal(dev, err, "%s", message); fail: pr_debug("failed\n"); netback_remove(dev); return err; } static const struct xenbus_device_id netback_ids[] = { { "vif" }, { "" } }; static struct xenbus_driver netback_driver = { .ids = netback_ids, .probe = netback_probe, .remove = netback_remove, .uevent = netback_uevent, .otherend_changed = frontend_changed, .allow_rebind = true, }; int xenvif_xenbus_init(void) { return xenbus_register_backend(&netback_driver); } void xenvif_xenbus_fini(void) { return xenbus_unregister_driver(&netback_driver); }
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