svn commit: r225707 - head/sys/dev/xen/netfront
Justin T. Gibbs
gibbs at FreeBSD.org
Wed Sep 21 00:08:25 UTC 2011
Author: gibbs
Date: Wed Sep 21 00:08:25 2011
New Revision: 225707
URL: http://svn.freebsd.org/changeset/base/225707
Log:
Correct suspend/resume support in the Netfront driver.
Sponsored by: BQ Internet
sys/dev/xen/netfront/netfront.c:
o Implement netfront_suspend(), a specialized suspend
handler for the netfront driver. This routine simply
disables the carrier so the driver is idle during
system suspend processing.
o Fix a leak when re-initializing LRO during a link reset.
o In netif_release_tx_bufs(), when cleaning up the grant
references for our TX ring, use gnttab_end_foreign_access_ref
instead of attempting to grant the page again.
o In netif_release_tx_bufs(), we do not track mbufs associated
with mbuf chains, but instead just free each mbuf directly.
Use m_free(), not m_freem(), to avoid double frees of mbufs.
o Refactor some code to enhance clarity.
Approved by: re
MFC after: 1 week
Modified:
head/sys/dev/xen/netfront/netfront.c
Modified: head/sys/dev/xen/netfront/netfront.c
==============================================================================
--- head/sys/dev/xen/netfront/netfront.c Wed Sep 21 00:06:02 2011 (r225706)
+++ head/sys/dev/xen/netfront/netfront.c Wed Sep 21 00:08:25 2011 (r225707)
@@ -159,6 +159,7 @@ static int xn_ioctl(struct ifnet *, u_l
static void xn_ifinit_locked(struct netfront_info *);
static void xn_ifinit(void *);
static void xn_stop(struct netfront_info *);
+static int xn_configure_lro(struct netfront_info *np);
#ifdef notyet
static void xn_watchdog(struct ifnet *);
#endif
@@ -174,7 +175,7 @@ static int talk_to_backend(device_t dev,
static int create_netdev(device_t dev);
static void netif_disconnect_backend(struct netfront_info *info);
static int setup_device(device_t dev, struct netfront_info *info);
-static void end_access(int ref, void *page);
+static void free_ring(int *ref, void *ring_ptr_ref);
static int xn_ifmedia_upd(struct ifnet *ifp);
static void xn_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
@@ -463,6 +464,18 @@ netfront_attach(device_t dev)
return 0;
}
+static int
+netfront_suspend(device_t dev)
+{
+ struct netfront_info *info = device_get_softc(dev);
+
+ XN_RX_LOCK(info);
+ XN_TX_LOCK(info);
+ netfront_carrier_off(info);
+ XN_TX_UNLOCK(info);
+ XN_RX_UNLOCK(info);
+ return (0);
+}
/**
* We are reconnecting to the backend, due to a suspend/resume, or a backend
@@ -749,10 +762,7 @@ netif_release_tx_bufs(struct netfront_in
*/
if (((uintptr_t)m) <= NET_TX_RING_SIZE)
continue;
- gnttab_grant_foreign_access_ref(np->grant_tx_ref[i],
- xenbus_get_otherend_id(np->xbdev),
- virt_to_mfn(mtod(m, vm_offset_t)),
- GNTMAP_readonly);
+ gnttab_end_foreign_access_ref(np->grant_tx_ref[i]);
gnttab_release_grant_reference(&np->gref_tx_head,
np->grant_tx_ref[i]);
np->grant_tx_ref[i] = GRANT_REF_INVALID;
@@ -761,7 +771,7 @@ netif_release_tx_bufs(struct netfront_in
if (np->xn_cdata.xn_tx_chain_cnt < 0) {
panic("netif_release_tx_bufs: tx_chain_cnt must be >= 0");
}
- m_freem(m);
+ m_free(m);
}
}
@@ -1914,6 +1924,7 @@ network_connect(struct netfront_info *np
netif_release_tx_bufs(np);
/* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
+ xn_configure_lro(np);
for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
struct mbuf *m;
u_long pfn;
@@ -1978,6 +1989,30 @@ show_device(struct netfront_info *sc)
#endif
}
+static int
+xn_configure_lro(struct netfront_info *np)
+{
+ int err;
+
+ err = 0;
+#if __FreeBSD_version >= 700000
+ if ((np->xn_ifp->if_capabilities & IFCAP_LRO) != 0)
+ tcp_lro_free(&np->xn_lro);
+ np->xn_ifp->if_capabilities &= ~IFCAP_LRO;
+ if (xn_enable_lro) {
+ err = tcp_lro_init(&np->xn_lro);
+ if (err) {
+ device_printf(np->xbdev, "LRO initialization failed\n");
+ } else {
+ np->xn_lro.ifp = np->xn_ifp;
+ np->xn_ifp->if_capabilities |= IFCAP_LRO;
+ }
+ }
+ np->xn_ifp->if_capenable = np->xn_ifp->if_capabilities;
+#endif
+ return (err);
+}
+
/** Create a network device.
* @param handle device handle
*/
@@ -2057,17 +2092,9 @@ create_netdev(device_t dev)
ifp->if_capabilities = IFCAP_HWCSUM;
#if __FreeBSD_version >= 700000
ifp->if_capabilities |= IFCAP_TSO4;
- if (xn_enable_lro) {
- int err = tcp_lro_init(&np->xn_lro);
- if (err) {
- device_printf(dev, "LRO initialization failed\n");
- goto exit;
- }
- np->xn_lro.ifp = ifp;
- ifp->if_capabilities |= IFCAP_LRO;
- }
#endif
ifp->if_capenable = ifp->if_capabilities;
+ xn_configure_lro(np);
ether_ifattach(ifp, np->mac);
callout_init(&np->xn_stat_ch, CALLOUT_MPSAFE);
@@ -2133,12 +2160,8 @@ netif_disconnect_backend(struct netfront
XN_TX_UNLOCK(info);
XN_RX_UNLOCK(info);
- end_access(info->tx_ring_ref, info->tx.sring);
- end_access(info->rx_ring_ref, info->rx.sring);
- info->tx_ring_ref = GRANT_REF_INVALID;
- info->rx_ring_ref = GRANT_REF_INVALID;
- info->tx.sring = NULL;
- info->rx.sring = NULL;
+ free_ring(&info->tx_ring_ref, &info->tx.sring);
+ free_ring(&info->rx_ring_ref, &info->rx.sring);
if (info->irq)
unbind_from_irqhandler(info->irq);
@@ -2146,12 +2169,17 @@ netif_disconnect_backend(struct netfront
info->irq = 0;
}
-
static void
-end_access(int ref, void *page)
+free_ring(int *ref, void *ring_ptr_ref)
{
- if (ref != GRANT_REF_INVALID)
- gnttab_end_foreign_access(ref, page);
+ void **ring_ptr_ptr = ring_ptr_ref;
+
+ if (*ref != GRANT_REF_INVALID) {
+ /* This API frees the associated storage. */
+ gnttab_end_foreign_access(*ref, *ring_ptr_ptr);
+ *ref = GRANT_REF_INVALID;
+ }
+ *ring_ptr_ptr = NULL;
}
static int
@@ -2174,7 +2202,7 @@ static device_method_t netfront_methods[
DEVMETHOD(device_attach, netfront_attach),
DEVMETHOD(device_detach, netfront_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
- DEVMETHOD(device_suspend, bus_generic_suspend),
+ DEVMETHOD(device_suspend, netfront_suspend),
DEVMETHOD(device_resume, netfront_resume),
/* Xenbus interface */
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