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| author | Wei Liu <wei.liu2@citrix.com> | 2013-05-22 06:34:45 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-23 18:40:37 -0700 |
| commit | e1f00a69ec26e3eb9847c61c665b8fb3f0c6b477 (patch) | |
| tree | 5958617283d231a3a58229e0e78a4d4623a569a5 /drivers/net/xen-netback/common.h | |
| parent | 8892475386e819aa50856947948c546ccc964d96 (diff) | |
| download | linux-e1f00a69ec26e3eb9847c61c665b8fb3f0c6b477.tar.bz2 | |
xen-netback: split event channels support for Xen backend driver
Netback and netfront only use one event channel to do TX / RX notification,
which may cause unnecessary wake-up of processing routines. This patch adds a
new feature called feature-split-event-channels to netback, enabling it to
handle TX and RX events separately.
Netback will use tx_irq to notify guest for TX completion, rx_irq for RX
notification.
If frontend doesn't support this feature, tx_irq equals to rx_irq.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/xen-netback/common.h')
| -rw-r--r-- | drivers/net/xen-netback/common.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index 6102a6c59f4e..8a4d77ee9c5b 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -57,8 +57,12 @@ struct xenvif { u8 fe_dev_addr[6]; - /* Physical parameters of the comms window. */ - unsigned int irq; + /* When feature-split-event-channels = 0, tx_irq = rx_irq. */ + unsigned int tx_irq; + unsigned int rx_irq; + /* Only used when feature-split-event-channels = 1 */ + char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */ + char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */ /* List of frontends to notify after a batch of frames sent. */ struct list_head notify_list; @@ -113,7 +117,8 @@ struct xenvif *xenvif_alloc(struct device *parent, unsigned int handle); int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, - unsigned long rx_ring_ref, unsigned int evtchn); + unsigned long rx_ring_ref, unsigned int tx_evtchn, + unsigned int rx_evtchn); void xenvif_disconnect(struct xenvif *vif); void xenvif_get(struct xenvif *vif); @@ -158,4 +163,6 @@ 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); +extern bool separate_tx_rx_irq; + #endif /* __XEN_NETBACK__COMMON_H__ */ |