From: Shannon Nelson Date: Mon, 13 Feb 2017 18:57:04 +0000 (-0800) Subject: ldmvsw: disable tso and gso for bridge operations X-Git-Tag: v4.11-rc1~124^2~110^2 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=bc221a34ac473b444a7cfdd0c152b4c71f79326b;p=linux.git ldmvsw: disable tso and gso for bridge operations The ldmvsw driver is specifically for supporting the ldom virtual networking by running in the primary ldom and using the LDC to connect the remaining ldoms to the outside world via a bridge. With TSO and GSO supported while connected the bridge, things tend to misbehave as seen in our case by delayed packets, enough to begin triggering retransmits and affecting overall throughput. By turning off advertised support for TSO and GSO we restore stable traffic flow through the bridge. Orabug: 23293104 Signed-off-by: Shannon Nelson Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/sun/ldmvsw.c b/drivers/net/ethernet/sun/ldmvsw.c index f0fe6cf57cda..89952deae47f 100644 --- a/drivers/net/ethernet/sun/ldmvsw.c +++ b/drivers/net/ethernet/sun/ldmvsw.c @@ -234,8 +234,7 @@ static struct net_device *vsw_alloc_netdev(u8 hwaddr[], dev->ethtool_ops = &vsw_ethtool_ops; dev->watchdog_timeo = VSW_TX_TIMEOUT; - dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | - NETIF_F_HW_CSUM | NETIF_F_SG; + dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG; dev->features = dev->hw_features; /* MTU range: 68 - 65535 */ @@ -320,7 +319,7 @@ static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) port->vp = vp; port->dev = dev; port->switch_port = 1; - port->tso = true; + port->tso = false; /* no tso in vsw, misbehaves in bridge */ port->tsolen = 0; /* Mark the port as belonging to ldmvsw which directs the diff --git a/drivers/net/ethernet/sun/sunvnet_common.c b/drivers/net/ethernet/sun/sunvnet_common.c index 65f7038e82fe..fa2d11ca9b81 100644 --- a/drivers/net/ethernet/sun/sunvnet_common.c +++ b/drivers/net/ethernet/sun/sunvnet_common.c @@ -186,6 +186,7 @@ static int handle_attr_info(struct vio_driver_state *vio, } else { pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; pkt->ipv4_lso_maxlen = 0; + port->tsolen = 0; } /* for version >= 1.6, ACK packet mode we support */ @@ -1635,7 +1636,7 @@ static void vnet_port_reset(struct vnet_port *port) del_timer(&port->clean_timer); sunvnet_port_free_tx_bufs_common(port); port->rmtu = 0; - port->tso = true; + port->tso = (port->vsw == 0); /* no tso in vsw, misbehaves in bridge */ port->tsolen = 0; }