diff options
Diffstat (limited to 'drivers/net/xen-netback/common.h')
| -rw-r--r-- | drivers/net/xen-netback/common.h | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index 8f264df8818a..5a991266a394 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -79,6 +79,17 @@ struct pending_tx_info { * if it is head of one or more tx * reqs */ + /* 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; }; #define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) @@ -135,13 +146,31 @@ struct xenvif { 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]; /* Coalescing tx requests before copying makes number of grant * copy ops greater or equal to number of slots required. In * worst case a tx request consumes 2 gnttab_copy. */ struct gnttab_copy tx_copy_ops[2*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; @@ -228,6 +257,8 @@ int xenvif_tx_action(struct xenvif *vif, int budget); int xenvif_kthread_guest_rx(void *data); void xenvif_kick_thread(struct xenvif *vif); +int xenvif_dealloc_kthread(void *data); + /* Determine whether the needed number of slots (req) are available, * and set req_event if not. */ @@ -235,6 +266,12 @@ bool xenvif_rx_ring_slots_available(struct xenvif *vif, int needed); void xenvif_stop_queue(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 *vif, u16 pending_idx); + static inline pending_ring_idx_t nr_pending_reqs(struct xenvif *vif) { return MAX_PENDING_REQS - |