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authoryuchenlin <yuchenlin@synology.com>2019-03-13 06:56:49 +0000
committerJason Wang <jasowang@redhat.com>2019-03-29 15:22:18 +0800
commit157628d067072118b15569661f0adf9141c34383 (patch)
treed31c2310b07ac49c5e34a516ec9e45691dc95881 /hw/net
parentfdec16e3c2a614e2861f3086b05d444b5d8c3406 (diff)
e1000: Delay flush queue when receive RCTL
Due to too early RCT0 interrput, win10x32 may hang on booting. This problem can be reproduced by doing power cycle on win10x32 guest. In our environment, we have 10 win10x32 and stress power cycle. The problem will happen about 20 rounds. Below shows some log with comment: The normal case: 22831@1551928392.984687:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 22831@1551928392.985655:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 22831@1551928392.985801:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: RCTL: 0, mac_reg[RCTL] = 0x0 22831@1551928393.056710:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: ICR read: 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: RCTL: 0, mac_reg[RCTL] = 0x0 22831@1551928393.077548:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: ICR read: 0 e1000: set_ics 2, ICR 0, IMR 0 e1000: set_ics 2, ICR 2, IMR 0 e1000: RCTL: 0, mac_reg[RCTL] = 0x0 22831@1551928393.102974:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 22831@1551928393.103267:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: RCTL: 255, mac_reg[RCTL] = 0x40002 <- win10x32 says it can handle RX now e1000: set_ics 0, ICR 2, IMR 9d <- unmask interrupt e1000: RCTL: 255, mac_reg[RCTL] = 0x48002 e1000: set_ics 80, ICR 2, IMR 9d <- interrupt and work! ... The bad case: 27744@1551930483.117766:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 27744@1551930483.118398:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: RCTL: 0, mac_reg[RCTL] = 0x0 27744@1551930483.198063:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: ICR read: 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: RCTL: 0, mac_reg[RCTL] = 0x0 27744@1551930483.218675:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: set_ics 0, ICR 0, IMR 0 e1000: ICR read: 0 e1000: set_ics 2, ICR 0, IMR 0 e1000: set_ics 2, ICR 2, IMR 0 e1000: RCTL: 0, mac_reg[RCTL] = 0x0 27744@1551930483.241768:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 27744@1551930483.241979:e1000x_rx_disabled Received packet dropped because receive is disabled RCTL = 0 e1000: RCTL: 255, mac_reg[RCTL] = 0x40002 <- win10x32 says it can handle RX now e1000: set_ics 80, ICR 2, IMR 0 <- flush queue (caused by setting RCTL) e1000: set_ics 0, ICR 82, IMR 9d <- unmask interrupt and because 0x82&0x9d != 0 generate interrupt, hang on here... To workaround this problem, simply delay flush queue. Also stop receiving when timer is going to run. Tested on CentOS, Win7SP1x64 and Win10x32. Signed-off-by: yuchenlin <yuchenlin@synology.com> Reviewed-by: Dmitry Fleytman <dmitry.fleytman@gmail.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'hw/net')
-rw-r--r--hw/net/e1000.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index 5e144cb4e4..9b39bccfb2 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -120,6 +120,8 @@ typedef struct E1000State_st {
bool mit_irq_level; /* Tracks interrupt pin level. */
uint32_t mit_ide; /* Tracks E1000_TXD_CMD_IDE bit. */
+ QEMUTimer *flush_queue_timer;
+
/* Compatibility flags for migration to/from qemu 1.3.0 and older */
#define E1000_FLAG_AUTONEG_BIT 0
#define E1000_FLAG_MIT_BIT 1
@@ -366,6 +368,7 @@ static void e1000_reset(void *opaque)
timer_del(d->autoneg_timer);
timer_del(d->mit_timer);
+ timer_del(d->flush_queue_timer);
d->mit_timer_on = 0;
d->mit_irq_level = 0;
d->mit_ide = 0;
@@ -392,6 +395,14 @@ set_ctrl(E1000State *s, int index, uint32_t val)
}
static void
+e1000_flush_queue_timer(void *opaque)
+{
+ E1000State *s = opaque;
+
+ qemu_flush_queued_packets(qemu_get_queue(s->nic));
+}
+
+static void
set_rx_control(E1000State *s, int index, uint32_t val)
{
s->mac_reg[RCTL] = val;
@@ -399,7 +410,8 @@ set_rx_control(E1000State *s, int index, uint32_t val)
s->rxbuf_min_shift = ((val / E1000_RCTL_RDMTS_QUAT) & 3) + 1;
DBGOUT(RX, "RCTL: %d, mac_reg[RCTL] = 0x%x\n", s->mac_reg[RDT],
s->mac_reg[RCTL]);
- qemu_flush_queued_packets(qemu_get_queue(s->nic));
+ timer_mod(s->flush_queue_timer,
+ qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 1000);
}
static void
@@ -837,7 +849,7 @@ e1000_can_receive(NetClientState *nc)
E1000State *s = qemu_get_nic_opaque(nc);
return e1000x_rx_ready(&s->parent_obj, s->mac_reg) &&
- e1000_has_rxbufs(s, 1);
+ e1000_has_rxbufs(s, 1) && !timer_pending(s->flush_queue_timer);
}
static uint64_t rx_desc_base(E1000State *s)
@@ -881,6 +893,10 @@ e1000_receive_iov(NetClientState *nc, const struct iovec *iov, int iovcnt)
return -1;
}
+ if (timer_pending(s->flush_queue_timer)) {
+ return 0;
+ }
+
/* Pad to minimum Ethernet frame length */
if (size < sizeof(min_buf)) {
iov_to_buf(iov, iovcnt, 0, min_buf, size);
@@ -1637,6 +1653,8 @@ pci_e1000_uninit(PCIDevice *dev)
timer_free(d->autoneg_timer);
timer_del(d->mit_timer);
timer_free(d->mit_timer);
+ timer_del(d->flush_queue_timer);
+ timer_free(d->flush_queue_timer);
qemu_del_nic(d->nic);
}
@@ -1700,6 +1718,8 @@ static void pci_e1000_realize(PCIDevice *pci_dev, Error **errp)
d->autoneg_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, e1000_autoneg_timer, d);
d->mit_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, e1000_mit_timer, d);
+ d->flush_queue_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
+ e1000_flush_queue_timer, d);
}
static void qdev_e1000_reset(DeviceState *dev)