diff options
Diffstat (limited to 'drivers/net/xen-netback/netback.c')
| -rw-r--r-- | drivers/net/xen-netback/netback.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 8518a0d1f6f9..bc943205a691 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -133,6 +133,11 @@ static inline pending_ring_idx_t pending_index(unsigned i) return i & (MAX_PENDING_REQS-1); } +static inline pending_ring_idx_t nr_free_slots(struct xen_netif_tx_back_ring *ring) +{ + return ring->nr_ents - (ring->sring->req_prod - ring->rsp_prod_pvt); +} + bool xenvif_rx_ring_slots_available(struct xenvif *vif, int needed) { RING_IDX prod, cons; @@ -1716,9 +1721,36 @@ static inline int tx_work_todo(struct xenvif *vif) return 0; } +static void xenvif_dealloc_delay(unsigned long data) +{ + struct xenvif *vif = (struct xenvif *)data; + + vif->dealloc_delay_timed_out = true; + wake_up(&vif->dealloc_wq); +} + static inline bool tx_dealloc_work_todo(struct xenvif *vif) { - return vif->dealloc_cons != vif->dealloc_prod; + if (vif->dealloc_cons != vif->dealloc_prod) { + if ((nr_free_slots(&vif->tx) > 2 * XEN_NETBK_LEGACY_SLOTS_MAX) && + (vif->dealloc_prod - vif->dealloc_cons < MAX_PENDING_REQS / 4) && + !vif->dealloc_delay_timed_out) { + if (!timer_pending(&vif->dealloc_delay)) { + vif->dealloc_delay.function = + xenvif_dealloc_delay; + vif->dealloc_delay.data = (unsigned long)vif; + mod_timer(&vif->dealloc_delay, + jiffies + msecs_to_jiffies(1)); + + } + return false; + } + del_timer_sync(&vif->dealloc_delay); + vif->dealloc_delay_timed_out = false; + return true; + } + + return false; } void xenvif_unmap_frontend_rings(struct xenvif *vif) |
