Differential D23348 Diff 67363 sys/dev/xen/netback/netback.c

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sys/dev/xen/netback/netback.c

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* Transfers packets from the Xen ring to the host's generic networking stack		* Transfers packets from the Xen ring to the host's generic networking stack
*		*
* \param arg Callback argument registerd during event channel		* \param arg Callback argument registerd during event channel
* binding - the xnb_softc for this instance.		* binding - the xnb_softc for this instance.
*/		*/
static void		static void
xnb_intr(void *arg)		xnb_intr(void *arg)
{		{
		struct epoch_tracker et;
struct xnb_softc *xnb;		struct xnb_softc *xnb;
struct ifnet *ifp;		struct ifnet *ifp;
netif_tx_back_ring_t *txb;		netif_tx_back_ring_t *txb;
RING_IDX req_prod_local;		RING_IDX req_prod_local;

xnb = (struct xnb_softc *)arg;		xnb = (struct xnb_softc *)arg;
ifp = xnb->xnb_ifp;		ifp = xnb->xnb_ifp;
txb = &xnb->ring_configs[XNB_RING_TYPE_TX].back_ring.tx_ring;		txb = &xnb->ring_configs[XNB_RING_TYPE_TX].back_ring.tx_ring;

mtx_lock(&xnb->tx_lock);		mtx_lock(&xnb->tx_lock);
		NET_EPOCH_ENTER(et);
do {		do {
int notify;		int notify;
req_prod_local = txb->sring->req_prod;		req_prod_local = txb->sring->req_prod;
xen_rmb();		xen_rmb();

for (;;) {		for (;;) {
struct mbuf *mbufc;		struct mbuf *mbufc;
int err;		int err;
Show All 9 Lines	do {

RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(txb, notify);		RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(txb, notify);
if (notify != 0)		if (notify != 0)
xen_intr_signal(xnb->xen_intr_handle);		xen_intr_signal(xnb->xen_intr_handle);

txb->sring->req_event = txb->req_cons + 1;		txb->sring->req_event = txb->req_cons + 1;
xen_mb();		xen_mb();
} while (txb->sring->req_prod != req_prod_local) ;		} while (txb->sring->req_prod != req_prod_local) ;
		NET_EPOCH_EXIT(et);
mtx_unlock(&xnb->tx_lock);		mtx_unlock(&xnb->tx_lock);

xnb_start(ifp);		xnb_start(ifp);
}		}


/**		/**
* Build a struct xnb_pkt based on netif_tx_request's from a netif tx ring.		* Build a struct xnb_pkt based on netif_tx_request's from a netif tx ring.
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