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92 lines
2.9 KiB
92 lines
2.9 KiB
From: jbeulich@novell.com
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Subject: netback: use multicall for send multiple notifications
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Patch-mainline: obsolete
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This also yields a small fairness improvement since now notifications
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get sent in the order requests came in rather than in the inverse one.
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--- head-2011-02-08.orig/drivers/xen/core/evtchn.c 2011-02-16 08:29:29.000000000 +0100
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+++ head-2011-02-08/drivers/xen/core/evtchn.c 2011-02-16 08:29:50.000000000 +0100
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@@ -1473,6 +1473,27 @@ void notify_remote_via_irq(int irq)
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}
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EXPORT_SYMBOL_GPL(notify_remote_via_irq);
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+#if defined(CONFIG_XEN_BACKEND) || defined(CONFIG_XEN_BACKEND_MODULE)
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+int multi_notify_remote_via_irq(multicall_entry_t *mcl, int irq)
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+{
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+ const struct irq_cfg *cfg = irq_cfg(irq);
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+ int evtchn;
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+
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+ if (WARN_ON_ONCE(!cfg))
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+ return -EINVAL;
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+ BUG_ON(type_from_irq_cfg(cfg) == IRQT_VIRQ);
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+ BUG_IF_IPI(cfg);
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+
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+ evtchn = evtchn_from_irq_cfg(cfg);
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+ if (!VALID_EVTCHN(evtchn))
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+ return -EINVAL;
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+
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+ multi_notify_remote_via_evtchn(mcl, evtchn);
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(multi_notify_remote_via_irq);
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+#endif
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+
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int irq_to_evtchn_port(int irq)
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{
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const struct irq_cfg *cfg = irq_cfg(irq);
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--- head-2011-02-08.orig/drivers/xen/netback/netback.c 2011-01-03 13:30:08.000000000 +0100
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+++ head-2011-02-08/drivers/xen/netback/netback.c 2011-01-03 13:30:15.000000000 +0100
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@@ -767,10 +767,20 @@ static void net_rx_action(unsigned long
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npo.meta_cons += nr_frags + 1;
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}
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- while (notify_nr != 0) {
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- irq = notify_list[--notify_nr];
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+ if (notify_nr == 1) {
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+ irq = *notify_list;
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__clear_bit(irq, rx_notify);
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notify_remote_via_irq(irq + DYNIRQ_BASE);
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+ } else {
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+ for (count = ret = 0; ret < notify_nr; ++ret) {
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+ irq = notify_list[ret];
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+ __clear_bit(irq, rx_notify);
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+ if (!multi_notify_remote_via_irq(rx_mcl + count,
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+ irq + DYNIRQ_BASE))
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+ ++count;
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+ }
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+ if (HYPERVISOR_multicall(rx_mcl, count))
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+ BUG();
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}
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/* More work to do? */
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--- head-2011-02-08.orig/include/xen/evtchn.h 2010-11-23 16:18:23.000000000 +0100
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+++ head-2011-02-08/include/xen/evtchn.h 2010-11-23 16:20:08.000000000 +0100
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@@ -193,6 +193,18 @@ static inline void notify_remote_via_evt
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VOID(HYPERVISOR_event_channel_op(EVTCHNOP_send, &send));
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}
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+static inline void
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+multi_notify_remote_via_evtchn(multicall_entry_t *mcl, int port)
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+{
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+ struct evtchn_send *send = (void *)(mcl->args + 2);
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+
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+ BUILD_BUG_ON(sizeof(*send) > sizeof(mcl->args) - 2 * sizeof(*mcl->args));
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+ send->port = port;
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+ mcl->op = __HYPERVISOR_event_channel_op;
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+ mcl->args[0] = EVTCHNOP_send;
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+ mcl->args[1] = (unsigned long)send;
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+}
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+
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static inline int close_evtchn(int port)
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{
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struct evtchn_close close = { .port = port };
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@@ -207,6 +219,7 @@ int xen_test_irq_pending(int irq);
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* by bind_*_to_irqhandler().
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*/
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void notify_remote_via_irq(int irq);
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+int multi_notify_remote_via_irq(multicall_entry_t *, int irq);
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int irq_to_evtchn_port(int irq);
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#if defined(CONFIG_SMP) && !defined(MODULE) && defined(CONFIG_X86)
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