diff options
Diffstat (limited to 'drivers/net/xen-netback/common.h')
| -rw-r--r-- | drivers/net/xen-netback/common.h | 270 |
1 files changed, 208 insertions, 62 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index 9d7f1723dd8..2532ce85d71 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -45,59 +45,187 @@ #include <xen/grant_table.h> #include <xen/xenbus.h> -struct xen_netbk; +typedef unsigned int pending_ring_idx_t; +#define INVALID_PENDING_RING_IDX (~0U) + +struct pending_tx_info { + struct xen_netif_tx_request req; /* tx request */ + /* Callback data for released SKBs. The callback is always + * xenvif_zerocopy_callback, desc contains the pending_idx, which is + * also an index in pending_tx_info array. It is initialized in + * xenvif_alloc and it never changes. + * skb_shinfo(skb)->destructor_arg points to the first mapped slot's + * callback_struct in this array of struct pending_tx_info's, then ctx + * to the next, or NULL if there is no more slot for this skb. + * ubuf_to_vif is a helper which finds the struct xenvif from a pointer + * to this field. + */ + struct ubuf_info callback_struct; +}; -struct xenvif { - /* Unique identifier for this interface. */ - domid_t domid; - unsigned int handle; +#define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) +#define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) + +struct xenvif_rx_meta { + int id; + int size; + int gso_type; + int gso_size; +}; - /* Reference to netback processing backend. */ - struct xen_netbk *netbk; +#define GSO_BIT(type) \ + (1 << XEN_NETIF_GSO_TYPE_ ## type) - u8 fe_dev_addr[6]; +/* Discriminate from any valid pending_idx value. */ +#define INVALID_PENDING_IDX 0xFFFF + +#define MAX_BUFFER_OFFSET PAGE_SIZE + +#define MAX_PENDING_REQS XEN_NETIF_TX_RING_SIZE + +/* It's possible for an skb to have a maximal number of frags + * but still be less than MAX_BUFFER_OFFSET in size. Thus the + * worst-case number of copy operations is MAX_SKB_FRAGS per + * ring slot. + */ +#define MAX_GRANT_COPY_OPS (MAX_SKB_FRAGS * XEN_NETIF_RX_RING_SIZE) + +#define NETBACK_INVALID_HANDLE -1 + +/* To avoid confusion, we define XEN_NETBK_LEGACY_SLOTS_MAX indicating + * the maximum slots a valid packet can use. Now this value is defined + * to be XEN_NETIF_NR_SLOTS_MIN, which is supposed to be supported by + * all backend. + */ +#define XEN_NETBK_LEGACY_SLOTS_MAX XEN_NETIF_NR_SLOTS_MIN - /* Physical parameters of the comms window. */ - unsigned int irq; +/* Queue name is interface name with "-qNNN" appended */ +#define QUEUE_NAME_SIZE (IFNAMSIZ + 5) - /* List of frontends to notify after a batch of frames sent. */ - struct list_head notify_list; +/* IRQ name is queue name with "-tx" or "-rx" appended */ +#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) - /* The shared rings and indexes. */ +struct xenvif; + +struct xenvif_stats { + /* Stats fields to be updated per-queue. + * A subset of struct net_device_stats that contains only the + * fields that are updated in netback.c for each queue. + */ + unsigned int rx_bytes; + unsigned int rx_packets; + unsigned int tx_bytes; + unsigned int tx_packets; + + /* Additional stats used by xenvif */ + unsigned long rx_gso_checksum_fixup; + unsigned long tx_zerocopy_sent; + unsigned long tx_zerocopy_success; + unsigned long tx_zerocopy_fail; + unsigned long tx_frag_overflow; +}; + +struct xenvif_queue { /* Per-queue data for xenvif */ + unsigned int id; /* Queue ID, 0-based */ + char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ + struct xenvif *vif; /* Parent VIF */ + + /* Use NAPI for guest TX */ + struct napi_struct napi; + /* When feature-split-event-channels = 0, tx_irq = rx_irq. */ + unsigned int tx_irq; + /* Only used when feature-split-event-channels = 1 */ + char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ struct xen_netif_tx_back_ring tx; + struct sk_buff_head tx_queue; + struct page *mmap_pages[MAX_PENDING_REQS]; + pending_ring_idx_t pending_prod; + pending_ring_idx_t pending_cons; + u16 pending_ring[MAX_PENDING_REQS]; + struct pending_tx_info pending_tx_info[MAX_PENDING_REQS]; + grant_handle_t grant_tx_handle[MAX_PENDING_REQS]; + + struct gnttab_copy tx_copy_ops[MAX_PENDING_REQS]; + struct gnttab_map_grant_ref tx_map_ops[MAX_PENDING_REQS]; + struct gnttab_unmap_grant_ref tx_unmap_ops[MAX_PENDING_REQS]; + /* passed to gnttab_[un]map_refs with pages under (un)mapping */ + struct page *pages_to_map[MAX_PENDING_REQS]; + struct page *pages_to_unmap[MAX_PENDING_REQS]; + + /* This prevents zerocopy callbacks to race over dealloc_ring */ + spinlock_t callback_lock; + /* This prevents dealloc thread and NAPI instance to race over response + * creation and pending_ring in xenvif_idx_release. In xenvif_tx_err + * it only protect response creation + */ + spinlock_t response_lock; + pending_ring_idx_t dealloc_prod; + pending_ring_idx_t dealloc_cons; + u16 dealloc_ring[MAX_PENDING_REQS]; + struct task_struct *dealloc_task; + wait_queue_head_t dealloc_wq; + + /* Use kthread for guest RX */ + struct task_struct *task; + wait_queue_head_t wq; + /* When feature-split-event-channels = 0, tx_irq = rx_irq. */ + unsigned int rx_irq; + /* Only used when feature-split-event-channels = 1 */ + char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ struct xen_netif_rx_back_ring rx; + struct sk_buff_head rx_queue; + RING_IDX rx_last_skb_slots; + bool rx_queue_purge; - /* Frontend feature information. */ - u8 can_sg:1; - u8 gso:1; - u8 gso_prefix:1; - u8 csum:1; + struct timer_list wake_queue; - /* Internal feature information. */ - u8 can_queue:1; /* can queue packets for receiver? */ + struct gnttab_copy grant_copy_op[MAX_GRANT_COPY_OPS]; - /* - * Allow xenvif_start_xmit() to peek ahead in the rx request - * ring. This is a prediction of what rx_req_cons will be - * once all queued skbs are put on the ring. + /* We create one meta structure per ring request we consume, so + * the maximum number is the same as the ring size. */ - RING_IDX rx_req_cons_peek; + struct xenvif_rx_meta meta[XEN_NETIF_RX_RING_SIZE]; /* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */ unsigned long credit_bytes; unsigned long credit_usec; unsigned long remaining_credit; struct timer_list credit_timeout; + u64 credit_window_start; /* Statistics */ - unsigned long rx_gso_checksum_fixup; + struct xenvif_stats stats; +}; + +struct xenvif { + /* Unique identifier for this interface. */ + domid_t domid; + unsigned int handle; + + u8 fe_dev_addr[6]; + + /* Frontend feature information. */ + int gso_mask; + int gso_prefix_mask; + + u8 can_sg:1; + u8 ip_csum:1; + u8 ipv6_csum:1; + + /* Internal feature information. */ + u8 can_queue:1; /* can queue packets for receiver? */ + + /* Is this interface disabled? True when backend discovers + * frontend is rogue. + */ + bool disabled; + + /* Queues */ + struct xenvif_queue *queues; + unsigned int num_queues; /* active queues, resource allocated */ /* Miscellaneous private stuff. */ - struct list_head schedule_list; - atomic_t refcnt; struct net_device *dev; - - wait_queue_head_t waiting_to_free; }; static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif) @@ -105,56 +233,74 @@ static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif) return to_xenbus_device(vif->dev->dev.parent); } -#define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) -#define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) - struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, unsigned int handle); -int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, - unsigned long rx_ring_ref, unsigned int evtchn); -void xenvif_disconnect(struct xenvif *vif); +int xenvif_init_queue(struct xenvif_queue *queue); +void xenvif_deinit_queue(struct xenvif_queue *queue); -void xenvif_get(struct xenvif *vif); -void xenvif_put(struct xenvif *vif); +int xenvif_connect(struct xenvif_queue *queue, 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); int xenvif_schedulable(struct xenvif *vif); -int xen_netbk_rx_ring_full(struct xenvif *vif); +int xenvif_must_stop_queue(struct xenvif_queue *queue); -int xen_netbk_must_stop_queue(struct xenvif *vif); +int xenvif_queue_stopped(struct xenvif_queue *queue); +void xenvif_wake_queue(struct xenvif_queue *queue); /* (Un)Map communication rings. */ -void xen_netbk_unmap_frontend_rings(struct xenvif *vif); -int xen_netbk_map_frontend_rings(struct xenvif *vif, - grant_ref_t tx_ring_ref, - grant_ref_t rx_ring_ref); - -/* (De)Register a xenvif with the netback backend. */ -void xen_netbk_add_xenvif(struct xenvif *vif); -void xen_netbk_remove_xenvif(struct xenvif *vif); - -/* (De)Schedule backend processing for a xenvif */ -void xen_netbk_schedule_xenvif(struct xenvif *vif); -void xen_netbk_deschedule_xenvif(struct xenvif *vif); +void xenvif_unmap_frontend_rings(struct xenvif_queue *queue); +int xenvif_map_frontend_rings(struct xenvif_queue *queue, + grant_ref_t tx_ring_ref, + grant_ref_t rx_ring_ref); /* Check for SKBs from frontend and schedule backend processing */ -void xen_netbk_check_rx_xenvif(struct xenvif *vif); -/* Receive an SKB from the frontend */ -void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb); - -/* Queue an SKB for transmission to the frontend */ -void xen_netbk_queue_tx_skb(struct xenvif *vif, struct sk_buff *skb); -/* Notify xenvif that ring now has space to send an skb to the frontend */ -void xenvif_notify_tx_completion(struct xenvif *vif); +void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue); /* Prevent the device from generating any further traffic. */ void xenvif_carrier_off(struct xenvif *vif); -/* Returns number of ring slots required to send an skb to the frontend */ -unsigned int xen_netbk_count_skb_slots(struct xenvif *vif, struct sk_buff *skb); +int xenvif_tx_action(struct xenvif_queue *queue, int budget); + +int xenvif_kthread_guest_rx(void *data); +void xenvif_kick_thread(struct xenvif_queue *queue); + +int xenvif_dealloc_kthread(void *data); + +/* Determine whether the needed number of slots (req) are available, + * and set req_event if not. + */ +bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue, int needed); + +void xenvif_carrier_on(struct xenvif *vif); + +/* Callback from stack when TX packet can be released */ +void xenvif_zerocopy_callback(struct ubuf_info *ubuf, bool zerocopy_success); + +/* Unmap a pending page and release it back to the guest */ +void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx); + +static inline pending_ring_idx_t nr_pending_reqs(struct xenvif_queue *queue) +{ + return MAX_PENDING_REQS - + queue->pending_prod + queue->pending_cons; +} + +/* Callback from stack when TX packet can be released */ +void xenvif_zerocopy_callback(struct ubuf_info *ubuf, bool zerocopy_success); + +extern bool separate_tx_rx_irq; + +extern unsigned int rx_drain_timeout_msecs; +extern unsigned int rx_drain_timeout_jiffies; +extern unsigned int xenvif_max_queues; #endif /* __XEN_NETBACK__COMMON_H__ */ |