diff options
Diffstat (limited to 'drivers/net/xen-netback')
-rw-r--r-- | drivers/net/xen-netback/common.h | 1 | ||||
-rw-r--r-- | drivers/net/xen-netback/interface.c | 28 | ||||
-rw-r--r-- | drivers/net/xen-netback/netback.c | 94 | ||||
-rw-r--r-- | drivers/net/xen-netback/xenbus.c | 17 |
4 files changed, 88 insertions, 52 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index a197743..5715318 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -184,6 +184,7 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, unsigned long rx_ring_ref, unsigned int tx_evtchn, unsigned int rx_evtchn); void xenvif_disconnect(struct xenvif *vif); +void xenvif_free(struct xenvif *vif); int xenvif_xenbus_init(void); void xenvif_xenbus_fini(void); diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index 625c6f4..01bb854 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -353,6 +353,9 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, } netdev_dbg(dev, "Successfully created xenvif\n"); + + __module_get(THIS_MODULE); + return vif; } @@ -366,8 +369,6 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, if (vif->tx_irq) return 0; - __module_get(THIS_MODULE); - err = xenvif_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref); if (err < 0) goto err; @@ -406,7 +407,7 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, init_waitqueue_head(&vif->wq); vif->task = kthread_create(xenvif_kthread, - (void *)vif, vif->dev->name); + (void *)vif, "%s", vif->dev->name); if (IS_ERR(vif->task)) { pr_warn("Could not allocate kthread for %s\n", vif->dev->name); err = PTR_ERR(vif->task); @@ -452,12 +453,6 @@ void xenvif_carrier_off(struct xenvif *vif) void xenvif_disconnect(struct xenvif *vif) { - /* Disconnect funtion might get called by generic framework - * even before vif connects, so we need to check if we really - * need to do a module_put. - */ - int need_module_put = 0; - if (netif_carrier_ok(vif->dev)) xenvif_carrier_off(vif); @@ -468,23 +463,22 @@ void xenvif_disconnect(struct xenvif *vif) unbind_from_irqhandler(vif->tx_irq, vif); unbind_from_irqhandler(vif->rx_irq, vif); } - /* vif->irq is valid, we had a module_get in - * xenvif_connect. - */ - need_module_put = 1; + vif->tx_irq = 0; } if (vif->task) kthread_stop(vif->task); + xenvif_unmap_frontend_rings(vif); +} + +void xenvif_free(struct xenvif *vif) +{ netif_napi_del(&vif->napi); unregister_netdev(vif->dev); - xenvif_unmap_frontend_rings(vif); - free_netdev(vif->dev); - if (need_module_put) - module_put(THIS_MODULE); + module_put(THIS_MODULE); } diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 956130c..f3e591c 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -212,6 +212,49 @@ static bool start_new_rx_buffer(int offset, unsigned long size, int head) return false; } +struct xenvif_count_slot_state { + unsigned long copy_off; + bool head; +}; + +unsigned int xenvif_count_frag_slots(struct xenvif *vif, + unsigned long offset, unsigned long size, + struct xenvif_count_slot_state *state) +{ + unsigned count = 0; + + offset &= ~PAGE_MASK; + + while (size > 0) { + unsigned long bytes; + + bytes = PAGE_SIZE - offset; + + if (bytes > size) + bytes = size; + + if (start_new_rx_buffer(state->copy_off, bytes, state->head)) { + count++; + state->copy_off = 0; + } + + if (state->copy_off + bytes > MAX_BUFFER_OFFSET) + bytes = MAX_BUFFER_OFFSET - state->copy_off; + + state->copy_off += bytes; + + offset += bytes; + size -= bytes; + + if (offset == PAGE_SIZE) + offset = 0; + + state->head = false; + } + + return count; +} + /* * Figure out how many ring slots we're going to need to send @skb to * the guest. This function is essentially a dry run of @@ -219,48 +262,39 @@ static bool start_new_rx_buffer(int offset, unsigned long size, int head) */ unsigned int xenvif_count_skb_slots(struct xenvif *vif, struct sk_buff *skb) { + struct xenvif_count_slot_state state; unsigned int count; - int i, copy_off; + unsigned char *data; + unsigned i; - count = DIV_ROUND_UP(skb_headlen(skb), PAGE_SIZE); + state.head = true; + state.copy_off = 0; - copy_off = skb_headlen(skb) % PAGE_SIZE; + /* Slot for the first (partial) page of data. */ + count = 1; + /* Need a slot for the GSO prefix for GSO extra data? */ if (skb_shinfo(skb)->gso_size) count++; - for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { - unsigned long size = skb_frag_size(&skb_shinfo(skb)->frags[i]); - unsigned long offset = skb_shinfo(skb)->frags[i].page_offset; - unsigned long bytes; - - offset &= ~PAGE_MASK; - - while (size > 0) { - BUG_ON(offset >= PAGE_SIZE); - BUG_ON(copy_off > MAX_BUFFER_OFFSET); - - bytes = PAGE_SIZE - offset; - - if (bytes > size) - bytes = size; + data = skb->data; + while (data < skb_tail_pointer(skb)) { + unsigned long offset = offset_in_page(data); + unsigned long size = PAGE_SIZE - offset; - if (start_new_rx_buffer(copy_off, bytes, 0)) { - count++; - copy_off = 0; - } + if (data + size > skb_tail_pointer(skb)) + size = skb_tail_pointer(skb) - data; - if (copy_off + bytes > MAX_BUFFER_OFFSET) - bytes = MAX_BUFFER_OFFSET - copy_off; + count += xenvif_count_frag_slots(vif, offset, size, &state); - copy_off += bytes; + data += size; + } - offset += bytes; - size -= bytes; + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + unsigned long size = skb_frag_size(&skb_shinfo(skb)->frags[i]); + unsigned long offset = skb_shinfo(skb)->frags[i].page_offset; - if (offset == PAGE_SIZE) - offset = 0; - } + count += xenvif_count_frag_slots(vif, offset, size, &state); } return count; } diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index 1fe48fe3..a53782e 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -42,7 +42,7 @@ static int netback_remove(struct xenbus_device *dev) if (be->vif) { kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); - xenvif_disconnect(be->vif); + xenvif_free(be->vif); be->vif = NULL; } kfree(be); @@ -213,9 +213,18 @@ static void disconnect_backend(struct xenbus_device *dev) { struct backend_info *be = dev_get_drvdata(&dev->dev); + if (be->vif) + xenvif_disconnect(be->vif); +} + +static void destroy_backend(struct xenbus_device *dev) +{ + struct backend_info *be = dev_get_drvdata(&dev->dev); + if (be->vif) { + kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); - xenvif_disconnect(be->vif); + xenvif_free(be->vif); be->vif = NULL; } } @@ -246,14 +255,11 @@ static void frontend_changed(struct xenbus_device *dev, case XenbusStateConnected: if (dev->state == XenbusStateConnected) break; - backend_create_xenvif(be); if (be->vif) connect(be); break; case XenbusStateClosing: - if (be->vif) - kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); disconnect_backend(dev); xenbus_switch_state(dev, XenbusStateClosing); break; @@ -262,6 +268,7 @@ static void frontend_changed(struct xenbus_device *dev, xenbus_switch_state(dev, XenbusStateClosed); if (xenbus_dev_is_online(dev)) break; + destroy_backend(dev); /* fall through if not online */ case XenbusStateUnknown: device_unregister(&dev->dev); |