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xen-netback: Minor refactoring of netback code

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This patch contains a few bits of refactoring before introducing the grant
mapping changes:
- introducing xenvif_tx_pending_slots_available(), as this is used several
  times, and will be used more often
- rename the thread to vifX.Y-guest-rx, to signify it does RX work from the
  guest point of view

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zoltan Kiss 2014-03-06 21:48:24 +00:00 • committed by David S. Miller
parent 8f13dd9612
commit 121fa4b777
3 changed files with 27 additions and 22 deletions
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23
drivers/net/xen-netback/common.h
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@ -108,6 +108,15 @@ struct xenvif_rx_meta {
*/
#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
struct xenvif {
/* Unique identifier for this interface. */
domid_t domid;
@ -216,7 +225,7 @@ void xenvif_carrier_off(struct xenvif *vif);
int xenvif_tx_action(struct xenvif *vif, int budget);
int xenvif_kthread(void *data);
int xenvif_kthread_guest_rx(void *data);
void xenvif_kick_thread(struct xenvif *vif);
/* Determine whether the needed number of slots (req) are available,
@ -226,6 +235,18 @@ bool xenvif_rx_ring_slots_available(struct xenvif *vif, int needed);
void xenvif_stop_queue(struct xenvif *vif);
static inline pending_ring_idx_t nr_pending_reqs(struct xenvif *vif)
{
return MAX_PENDING_REQS -
vif->pending_prod + vif->pending_cons;
}
static inline bool xenvif_tx_pending_slots_available(struct xenvif *vif)
{
return nr_pending_reqs(vif) + XEN_NETBK_LEGACY_SLOTS_MAX
< MAX_PENDING_REQS;
}
extern bool separate_tx_rx_irq;
#endif /* __XEN_NETBACK__COMMON_H__ */