linux/net/core/dev.c, branch v3.19

net: remove some sparse warnings

2015-02-05T08:41:17Z

netdev_adjacent_add_links() and netdev_adjacent_del_links() are static. queue->qdisc has __rcu annotation, need to use RCU_INIT_POINTER() Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

net: Fix vlan_get_protocol for stacked vlan

2015-01-31T02:03:47Z

vlan_get_protocol() could not get network protocol if a skb has a 802.1ad vlan tag or multiple vlans, which caused incorrect checksum calculation in several drivers. Fix vlan_get_protocol() to retrieve network protocol instead of incorrect vlan protocol. As the logic is the same as skb_network_protocol(), create a common helper function __vlan_get_protocol() and call it from existing functions. Signed-off-by: Toshiaki Makita Signed-off-by: David S. Miller

net: rps: fix cpu unplug

2015-01-16T06:02:42Z

softnet_data.input_pkt_queue is protected by a spinlock that we must hold when transferring packets from victim queue to an active one. This is because other cpus could still be trying to enqueue packets into victim queue. A second problem is that when we transfert the NAPI poll_list from victim to current cpu, we absolutely need to special case the percpu backlog, because we do not want to add complex locking to protect process_queue : Only owner cpu is allowed to manipulate it, unless cpu is offline. Based on initial patch from Prasad Sodagudi & Subash Abhinov Kasiviswanathan. This version is better because we do not slow down packet processing, only make migration safer. Reported-by: Prasad Sodagudi Reported-by: Subash Abhinov Kasiviswanathan Signed-off-by: Eric Dumazet Cc: Tom Herbert Signed-off-by: David S. Miller

net: Generalize ndo_gso_check to ndo_features_check

2014-12-26T22:20:56Z

GSO isn't the only offload feature with restrictions that potentially can't be expressed with the current features mechanism. Checksum is another although it's a general issue that could in theory apply to anything. Even if it may be possible to implement these restrictions in other ways, it can result in duplicate code or inefficient per-packet behavior. This generalizes ndo_gso_check so that drivers can remove any features that don't make sense for a given packet, similar to netif_skb_features(). It also converts existing driver restrictions to the new format, completing the work that was done to support tunnel protocols since the issues apply to checksums as well. By actually removing features from the set that are used to do offloading, it solves another problem with the existing interface. In these cases, GSO would run with the original set of features and not do anything because it appears that segmentation is not required. CC: Tom Herbert CC: Joe Stringer CC: Eric Dumazet CC: Hayes Wang Signed-off-by: Jesse Gross Acked-by: Tom Herbert Fixes: 04ffcb255f22 ("net: Add ndo_gso_check") Tested-by: Hayes Wang Signed-off-by: David S. Miller

net/core: Handle csum for CHECKSUM_COMPLETE VXLAN forwarding

2014-12-26T21:16:51Z

When using VXLAN tunnels and a sky2 device, I have experienced checksum failures of the following type: [ 4297.761899] eth0: hw csum failure [...] [ 4297.765223] Call Trace: [ 4297.765224] [] dump_stack+0x46/0x58 [ 4297.765235] [] netdev_rx_csum_fault+0x42/0x50 [ 4297.765238] [] ? skb_push+0x40/0x40 [ 4297.765240] [] __skb_checksum_complete+0xbc/0xd0 [ 4297.765243] [] tcp_v4_rcv+0x2e2/0x950 [ 4297.765246] [] ? ip_rcv_finish+0x360/0x360 These are reliably reproduced in a network topology of: container:eth0 == host(OVS VXLAN on VLAN) == bond0 == eth0 (sky2) -> switch When VXLAN encapsulated traffic is received from a similarly configured peer, the above warning is generated in the receive processing of the encapsulated packet. Note that the warning is associated with the container eth0. The skbs from sky2 have ip_summed set to CHECKSUM_COMPLETE, and because the packet is an encapsulated Ethernet frame, the checksum generated by the hardware includes the inner protocol and Ethernet headers. The receive code is careful to update the skb->csum, except in __dev_forward_skb, as called by dev_forward_skb. __dev_forward_skb calls eth_type_trans, which in turn calls skb_pull_inline(skb, ETH_HLEN) to skip over the Ethernet header, but does not update skb->csum when doing so. This patch resolves the problem by adding a call to skb_postpull_rcsum to update the skb->csum after the call to eth_type_trans. Signed-off-by: Jay Vosburgh Signed-off-by: David S. Miller

net: Fix stacked vlan offload features computation

2014-12-24T05:08:33Z

When vlan tags are stacked, it is very likely that the outer tag is stored in skb->vlan_tci and skb->protocol shows the inner tag's vlan_proto. Currently netif_skb_features() first looks at skb->protocol even if there is the outer tag in vlan_tci, thus it incorrectly retrieves the protocol encapsulated by the inner vlan instead of the inner vlan protocol. This allows GSO packets to be passed to HW and they end up being corrupted. Fixes: 58e998c6d239 ("offloading: Force software GSO for multiple vlan tags.") Signed-off-by: Toshiaki Makita Signed-off-by: David S. Miller

mpls: Fix config check for mpls.

2014-12-24T04:57:30Z

Fixes MPLS GSO for case when mpls is compiled as kernel module. Fixes: 0d89d2035f ("MPLS: Add limited GSO support"). Signed-off-by: Pravin B Shelar Signed-off-by: David S. Miller

net: Rearrange loop in net_rx_action

2014-12-24T04:20:21Z

This patch rearranges the loop in net_rx_action to reduce the amount of jumping back and forth when reading the code. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller

net: Always poll at least one device in net_rx_action

2014-12-24T04:20:21Z

We should only perform the softnet_break check after we have polled at least one device in net_rx_action. Otherwise a zero or negative setting of netdev_budget can lock up the whole system. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller

net: Detect drivers that reschedule NAPI and exhaust budget

2014-12-24T04:20:21Z

The commit d75b1ade567ffab085e8adbbdacf0092d10cd09c (net: less interrupt masking in NAPI) required drivers to leave poll_list empty if the entire budget is consumed. We have already had two broken drivers so let's add a check for this. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller