|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] netback: allow arbitrary mtu size until frontend connects
# HG changeset patch # User Keir Fraser <keir@xxxxxxx> # Date 1297240735 0 # Node ID f6bae96cb09472afa9b3b1bd0e6ed2996b33713b # Parent 647366713aefe653d6892cba750bdfda5b180f7e netback: allow arbitrary mtu size until frontend connects Allow arbitrary mtu size until the frontend is connected. Once the connection is established, adjust mtu by checking if the backend supports the 'feature-sg'. If the backend does support it, keep the current mtu. Otherwise set it to the default value, which is 1500. based on two commits from https://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git bee2eec2355c4bf4e149a426d5e30527162de566 This allows large MTU to be configured by the VIF hotplug script. Previously this would fail because at the point the hotplug script runs the VIF features have most likely not been negotiated with the frontend and so SG has not yet been enabled. Invert this behaviour so that SG is assumed present until negotiations prove otherwise and reduce MTU at that point. Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx> d532fa93d4eeabbfc0176a6a9a93b0d6ade3f6c4 Make sure that if a feature flag is disabled by ethtool on netback that we do not gratuitously re-enabled it when we check the frontend features during ring connection. Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx> --- drivers/xen/netback/common.h | 12 +++++- drivers/xen/netback/interface.c | 72 ++++++++++++++++++++++++++++++++-------- drivers/xen/netback/netback.c | 2 - drivers/xen/netback/xenbus.c | 31 +++++++---------- 4 files changed, 81 insertions(+), 36 deletions(-) diff -r 647366713aef -r f6bae96cb094 drivers/xen/netback/common.h --- a/drivers/xen/netback/common.h Wed Jan 26 11:37:23 2011 +0000 +++ b/drivers/xen/netback/common.h Wed Feb 09 08:38:55 2011 +0000 @@ -75,8 +75,13 @@ typedef struct netif_st { struct vm_struct *tx_comms_area; struct vm_struct *rx_comms_area; - /* Set of features that can be turned on in dev->features. */ - int features; + /* Flags that must not be set in dev->features */ + int features_disabled; + + /* Frontend feature information. */ + u8 can_sg:1; + u8 gso:1; + u8 csum:1; /* Internal feature information. */ u8 can_queue:1; /* can queue packets for receiver? */ @@ -182,6 +187,7 @@ void netif_accel_init(void); void netif_disconnect(netif_t *netif); +void netif_set_features(netif_t *netif); netif_t *netif_alloc(struct device *parent, domid_t domid, unsigned int handle); int netif_map(netif_t *netif, unsigned long tx_ring_ref, unsigned long rx_ring_ref, unsigned int evtchn); @@ -214,7 +220,7 @@ static inline int netbk_can_sg(struct ne static inline int netbk_can_sg(struct net_device *dev) { netif_t *netif = netdev_priv(dev); - return netif->features & NETIF_F_SG; + return netif->can_sg; } #endif /* __NETIF__BACKEND__COMMON_H__ */ diff -r 647366713aef -r f6bae96cb094 drivers/xen/netback/interface.c --- a/drivers/xen/netback/interface.c Wed Jan 26 11:37:23 2011 +0000 +++ b/drivers/xen/netback/interface.c Wed Feb 09 08:38:55 2011 +0000 @@ -93,28 +93,69 @@ static int netbk_change_mtu(struct net_d return 0; } +void netif_set_features(netif_t *netif) +{ + struct net_device *dev = netif->dev; + int features = dev->features; + + if (netif->can_sg) + features |= NETIF_F_SG; + if (netif->gso) + features |= NETIF_F_TSO; + if (netif->csum) + features |= NETIF_F_IP_CSUM; + + features &= ~(netif->features_disabled); + + if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) + dev->mtu = ETH_DATA_LEN; + + dev->features = features; +} + +static int netbk_set_tx_csum(struct net_device *dev, u32 data) +{ + netif_t *netif = netdev_priv(dev); + if (data) { + if (!netif->csum) + return -ENOSYS; + netif->features_disabled &= ~NETIF_F_IP_CSUM; + } else { + netif->features_disabled |= NETIF_F_IP_CSUM; + } + + netif_set_features(netif); + return 0; +} + static int netbk_set_sg(struct net_device *dev, u32 data) { + netif_t *netif = netdev_priv(dev); if (data) { - netif_t *netif = netdev_priv(dev); - - if (!(netif->features & NETIF_F_SG)) + if (!netif->can_sg) return -ENOSYS; - } - - return ethtool_op_set_sg(dev, data); + netif->features_disabled &= ~NETIF_F_SG; + } else { + netif->features_disabled |= NETIF_F_SG; + } + + netif_set_features(netif); + return 0; } static int netbk_set_tso(struct net_device *dev, u32 data) { + netif_t *netif = netdev_priv(dev); if (data) { - netif_t *netif = netdev_priv(dev); - - if (!(netif->features & NETIF_F_TSO)) + if (!netif->gso) return -ENOSYS; - } - - return ethtool_op_set_tso(dev, data); + netif->features_disabled &= ~NETIF_F_TSO; + } else { + netif->features_disabled |= NETIF_F_TSO; + } + + netif_set_features(netif); + return 0; } static void netbk_get_drvinfo(struct net_device *dev, @@ -164,7 +205,7 @@ static struct ethtool_ops network_ethtoo .get_drvinfo = netbk_get_drvinfo, .get_tx_csum = ethtool_op_get_tx_csum, - .set_tx_csum = ethtool_op_set_tx_csum, + .set_tx_csum = netbk_set_tx_csum, .get_sg = ethtool_op_get_sg, .set_sg = netbk_set_sg, .get_tso = ethtool_op_get_tso, @@ -196,6 +237,8 @@ netif_t *netif_alloc(struct device *pare memset(netif, 0, sizeof(*netif)); netif->domid = domid; netif->handle = handle; + netif->can_sg = 1; + netif->csum = 1; atomic_set(&netif->refcnt, 1); init_waitqueue_head(&netif->waiting_to_free); netif->dev = dev; @@ -215,7 +258,8 @@ netif_t *netif_alloc(struct device *pare dev->open = net_open; dev->stop = net_close; dev->change_mtu = netbk_change_mtu; - dev->features = NETIF_F_IP_CSUM; + + netif_set_features(netif); SET_ETHTOOL_OPS(dev, &network_ethtool_ops); diff -r 647366713aef -r f6bae96cb094 drivers/xen/netback/netback.c --- a/drivers/xen/netback/netback.c Wed Jan 26 11:37:23 2011 +0000 +++ b/drivers/xen/netback/netback.c Wed Feb 09 08:38:55 2011 +0000 @@ -269,7 +269,7 @@ static struct sk_buff *netbk_copy_skb(st static inline int netbk_max_required_rx_slots(netif_t *netif) { - if (netif->features & (NETIF_F_SG|NETIF_F_TSO)) + if (netif->can_sg || netif->gso) return MAX_SKB_FRAGS + 2; /* header + extra_info + frags */ return 1; /* all in one */ } diff -r 647366713aef -r f6bae96cb094 drivers/xen/netback/xenbus.c --- a/drivers/xen/netback/xenbus.c Wed Jan 26 11:37:23 2011 +0000 +++ b/drivers/xen/netback/xenbus.c Wed Feb 09 08:38:55 2011 +0000 @@ -356,6 +356,7 @@ static void connect(struct backend_info static int connect_rings(struct backend_info *be) { + netif_t *netif = be->netif; struct xenbus_device *dev = be->dev; unsigned long tx_ring_ref, rx_ring_ref; unsigned int evtchn, rx_copy; @@ -386,44 +387,38 @@ static int connect_rings(struct backend_ dev->otherend); return err; } - be->netif->copying_receiver = !!rx_copy; - - if (be->netif->dev->tx_queue_len != 0) { + netif->copying_receiver = !!rx_copy; + + if (netif->dev->tx_queue_len != 0) { if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-rx-notify", "%d", &val) < 0) val = 0; if (val) - be->netif->can_queue = 1; + netif->can_queue = 1; else /* Must be non-zero for pfifo_fast to work. */ - be->netif->dev->tx_queue_len = 1; + netif->dev->tx_queue_len = 1; } if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg", "%d", &val) < 0) val = 0; - if (val) { - be->netif->features |= NETIF_F_SG; - be->netif->dev->features |= NETIF_F_SG; - } + netif->can_sg = !!val; if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4", "%d", &val) < 0) val = 0; - if (val) { - be->netif->features |= NETIF_F_TSO; - be->netif->dev->features |= NETIF_F_TSO; - } + netif->gso = !!val; if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload", "%d", &val) < 0) val = 0; - if (val) { - be->netif->features &= ~NETIF_F_IP_CSUM; - be->netif->dev->features &= ~NETIF_F_IP_CSUM; - } + netif->csum = !val; + + /* Set dev->features */ + netif_set_features(netif); /* Map the shared frame, irq etc. */ - err = netif_map(be->netif, tx_ring_ref, rx_ring_ref, evtchn); + err = netif_map(netif, tx_ring_ref, rx_ring_ref, evtchn); if (err) { xenbus_dev_fatal(dev, err, "mapping shared-frames %lu/%lu port %u", _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |