- 17 Dec, 2015 5 commits
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Hariprasad Shenai authored
Signed-off-by:
Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Jakub Kicinski authored
We need to clear delayed kick counters when we free rings otherwise after ndo_close()/ndo_open() we could kick HW by more entries than actually written to rings. Signed-off-by:
Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by:
Rolf Neugebauer <rolf.neugebauer@netronome.com> Signed-off-by:
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Eric Dumazet authored
If a tun interface is turned down, we should not allow packet injection into the kernel. Kernel does not send packets to the tun already. TUNATTACHFILTER can not be used as only tun_net_xmit() is taking care of it. Reported-by:
Curt Wohlgemuth <curtw@google.com> Signed-off-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
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Hannes Frederic Sowa authored
Same as in Windows, we miss IPV6_HDRINCL for SOL_IPV6 and SOL_RAW. The SOL_IP/IP_HDRINCL is not available for IPv6 sockets. Signed-off-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Xin Long authored
Add the support for adding expire value to routes, requested by Tom Gundersen <teg@jklm.no> for systemd-networkd, and NetworkManager wants it too. implement it by adding the new RTNETLINK attribute RTA_EXPIRES. Signed-off-by:
Xin Long <lucien.xin@gmail.com> Acked-by:
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- 16 Dec, 2015 30 commits
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Hubert Sokolowski authored
Before this change applications monitoring FDB notifications were not able to determine whether a new FDB entry is permament or not: bridge fdb add f1:f2:f3:f4:f5:f8 dev sw0p1 temp self bridge fdb add f1:f2:f3:f4:f5:f9 dev sw0p1 self bridge monitor fdb f1:f2:f3:f4:f5:f8 dev sw0p1 self permanent f1:f2:f3:f4:f5:f9 dev sw0p1 self permanent With this change ndm_state from the original netlink message is passed to the new netlink message sent as notification. bridge fdb add f1:f2:f3:f4:f5:f6 dev sw0p1 self bridge fdb add f1:f2:f3:f4:f5:f7 dev sw0p1 temp self bridge monitor fdb f1:f2:f3:f4:f5:f6 dev sw0p1 self permanent f1:f2:f3:f4:f5:f7 dev sw0p1 self static Signed-off-by:
Hubert Sokolowski <hubert.sokolowski@intel.com> Signed-off-by:
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git://git.open-mesh.org/linux-mergeDavid S. Miller authored
Antonio Quartulli says: ==================== Included changes: - change my email in MAINTAINERS and Doc files - create and export list of single hop neighs per interface - protect CRC in the BLA code by means of its own lock - minor fixes and code cleanups ==================== Signed-off-by: -
David S. Miller authored
Anjali Singhai Jain says: ==================== Add support for Geneve udp port offload This patch series adds new ndo ops for Geneve add/del port, so as to help offload Geneve tunnel functionalities such as RX checksum, RSS, filters etc. i40e driver has been tested with the changes to make sure the offloads happen. We do understand that this is not the ideal solution and most likely will be redone with a more generic offload framework. But this certainly will enable us to start seeing benefits of the accelerations for Geneve tunnels. As a side note, we did find an existing issue in i40e driver where a service task can modify tunnel data structures with no locks held to help linearize access. A separate patch will be taking care of that issue. A question out to the community is regarding the driver Kconfig parameters for VxLAN and Geneve, it would be ideal to drop those if there is a way to help resolve vxlan/geneve_get_rx_port symbols while the tunnel modules are not loaded. Performance numbers: With the offloads enable on X722 devices with remote checksum enabled and no other tuning in terms of cpu governer etc on my test machine: With offload Throughput: 5527Mbits/sec with a single thread %cpu: ~43% per core with 4 threads Without offload Throughput: 2364Mbits/sec with a single thread %cpu: ~99% per core with 4 threads These numbers will get better for X722 as it is being worked. But this does bring out the delta in terms of when the stack is notified with csum_level 1 and CHECKSUM_UNNECESSARY vs not without the RX offload. ==================== Signed-off-by: -
Singhai, Anjali authored
This patch adds a call to geneve_get_rx_port in i40e so that when it comes up it can learn about the existing geneve tunnels. Signed-off-by:
Anjali Singhai Jain <anjali.singhai@intel.com> Signed-off-by:
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Singhai, Anjali authored
This patch adds an op that the drivers can call into to get existing geneve ports. Signed-off-by:
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Singhai, Anjali authored
Update the Kconfig file with dependency for supporting GENEVE tunnel offloads. Signed-off-by:
Kiran Patil <kiran.patil@intel.com> Signed-off-by:
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Singhai, Anjali authored
This patch adds driver hooks to implement ndo_ops to add/del udp port in the HW to identify GENEVE tunnels. Signed-off-by:
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Singhai, Anjali authored
Add ndo_ops to add/del UDP ports to a device that supports geneve offload. v2: Comment fix. Signed-off-by:
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Zhu Yanjun authored
As we all know, the value of pf_retrans >= max_retrans_path can disable pf state. The variables of pf_retrans and max_retrans_path can be changed by the userspace application. Sometimes the user expects to disable pf state while the 2 variables are changed to enable pf state. So it is necessary to introduce a new variable to disable pf state. According to the suggestions from Vlad Yasevich, extra1 and extra2 are removed. The initialization of pf_enable is added. Acked-by:
Vlad Yasevich <vyasevich@gmail.com> Signed-off-by:
Zhu Yanjun <zyjzyj2000@gmail.com> Acked-by:
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by:
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Simon Wunderlich authored
We have found some networks in which nodes were constantly requesting other nodes BLA claim tables to synchronize, just to ask for that again once completed. The reason was that the crc checksum of the asked nodes were out of sync due to missing locking and multiple writes to the same crc checksum when adding/removing entries. Therefore the asked nodes constantly reported the wrong crc, which caused repeating requests. To avoid multiple functions changing a backbone gateways crc entry at the same time, lock it using a spinlock. Signed-off-by:
Simon Wunderlich <sw@simonwunderlich.de> Tested-by:
Alfons Name <AlfonsName@web.de> Signed-off-by:
Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by:
Antonio Quartulli <antonio@meshcoding.com>
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Sven Eckelmann authored
Signed-off-by:
Sven Eckelmann <sven@narfation.org> Signed-off-by:
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Sven Eckelmann authored
The chain pointer was already created in batadv_frag_purge_orig to make the checks more readable. Just use the chain pointer everywhere instead of having the same dereference + array access in the most lines of this function. Signed-off-by:
Martin Hundebøll <martin@hundeboll.net> Signed-off-by:
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Simon Wunderlich authored
This should slightly improve readability Signed-off-by:
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Simon Wunderlich authored
If the local representation of the global TT table of one originator has more VLAN entries than the respective TT update, there is some inconsistency present. By detecting and reporting this inconsistency, the global table gets updated and the excess VLAN will get removed in the process. Reported-by:
Alessandro Bolletta <alessandro@mediaspot.net> Signed-off-by:
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Eric Dumazet authored
modules init functions being called from process context, we better use GFP_KERNEL allocations to increase our chances to get these high-order pages we want for SCTP hash tables. This mostly matters if SCTP module is loaded once memory got fragmented. Signed-off-by:
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David S. Miller authored
Lorenzo Colitti says: ==================== Support administratively closing application sockets This patchset adds the ability to administratively close a socket without any action from the process owning the socket or the socket protocol. It implements this by adding a new diag_destroy function pointer to struct proto. In-kernel callers can access this functionality directly by calling sk->sk_prot->diag_destroy(sk, err). It also exposes this functionality to userspace via a new SOCK_DESTROY operation in the NETLINK_SOCK_DIAG sockets. This allows a privileged userspace process, such as a connection manager or system administration tool, to close sockets belonging to other apps when the network they were established on has disconnected. It is needed on laptops and mobile hosts to ensure that network switches / disconnects do not result in applications being blocked for long periods of time (minutes) in read or connect calls on TCP sockets that will never succeed because the IP address they are bound to is no longer on the system. Closing the sockets causes these calls to fail fast and allows the apps to reconnect on another network. Userspace intervention is necessary because in many cases the kernel does not have enough information to know that a connection is now inoperable. The kernel can know if a packet can't be routed, but in general it won't know if a TCP connection is stuck because it is now routed to a network where its source address is no longer valid [5][6]. Many other operating systems offer similar functionality: - FreeBSD has had this since 5.4 in 2005 [2]. It is available to privileged userspace and there is a tool to use it [3]. - The FreeBSD commit description states that the idea came from OpenBSD. - iOS has been administratively closing app sockets since iOS 4 - see [4], which states that a socket "might get reclaimed by the kernel" and after that will return EBADF]. For many years Android kernels have supported this via an out-of-tree SIOCKILLADDR ioctl that is called on every RTM_DELADDR event, but this solution is cleaner, more robust and more flexible: the connection manager can iterate over all connections on the deleted IP address and close all of them. It can also be used to close all sockets opened by a given app process, for example if the user has restricted that app from using the network, if a secure network such as a VPN has connected and security policy requires all of an application's connections to be routed via the VPN, etc. - For many years Android kernels have supported an out-of-tree SIOCKILLADDR ioctl that is called when a network disconnects or an RTM_DELADDR event is received. This solution is cleaner, more robust and more flexible. The connection manager can implement SIOCKILLADDR by iterating over all connections on the deleted IP address and close all of them, but it can also close all sockets opened by a given app process (for example if the user has restricted that app from), close all of a user's TCP connections if a user has connected a secure network such as a VPN and expects all of an application's connections to be routed via the VPN, etc. Alternative schemes such as TCP keepalives in combination with "iptables -j REJECT --reject-with tcp-reset", could be used to achieve similar results, but on mobile devices TCP keepalives are very expensive, and in such a scheme detecting stuck connections has to wait for a keepalive to be sent or the application to perform a write. An explicit notification from userspace is cheaper and faster in the common case where an application is blocked on read. SOCK_DESTROY is placed behind an INET_DIAG_DESTROY configuration option, which is currently off by default. The TCP implementation of diag_destroy causes a TCP ABORT as specified by RFC 793 [1]: immediately send a RST and clear local connection state. This is what happens today if an application enables SO_LINGER with a timeout of 0 and then calls close. The first versions of the patchset did not send a RST, but that is not graceful/correct TCP behaviour. tcp_abort now does a proper RFC 793 ABORT and sends a RST to the peer. This is consistent with BSD's tcpdrop, and is more correct in general, even though in many use cases tcp_abort will only be called when sending a RST is no longer possible (e.g., the network has disconnected). The original patchset also behaved like SIOCKILADDR and closed TCP sockets with ETIMEDOUT. Tom Herbert pointed out that it would be better if applications could distinguish between a timeout and an administrative close. ECONNABORTED was chosen because it is consistent with BSD. [1] http://tools.ietf.org/html/rfc793#page-50 [2] http://svnweb.freebsd.org/base?view=revision&revision=141381 [3] https://www.freebsd.org/cgi/man.cgi?query=tcpdrop&sektion=8&manpath=FreeBSD+5.4-RELEASE [4] https://developer.apple.com/library/ios/technotes/tn2277/_index.html#//apple_ref/doc/uid/DTS40010841-CH1-SUBSECTION3 [5] http://www.spinics.net/lists/netdev/msg352775.html [6] http://www.spinics.net/lists/netdev/msg352952.html ==================== Signed-off-by:
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Lorenzo Colitti authored
This implements SOCK_DESTROY for TCP sockets. It causes all blocking calls on the socket to fail fast with ECONNABORTED and causes a protocol close of the socket. It informs the other end of the connection by sending a RST, i.e., initiating a TCP ABORT as per RFC 793. ECONNABORTED was chosen for consistency with FreeBSD. Signed-off-by:
Lorenzo Colitti <lorenzo@google.com> Acked-by:
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Lorenzo Colitti authored
This passes the SOCK_DESTROY operation to the underlying protocol diag handler, or returns -EOPNOTSUPP if that handler does not define a destroy operation. Most of this patch is just renaming functions. This is not strictly necessary, but it would be fairly counterintuitive to have the code to destroy inet sockets be in a function whose name starts with inet_diag_get. Signed-off-by:
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Lorenzo Colitti authored
This patch adds a SOCK_DESTROY operation, a destroy function pointer to sock_diag_handler, and a diag_destroy function pointer. It does not include any implementation code. Signed-off-by:
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Lorenzo Colitti authored
Currently, inet_diag_dump_one_icsk finds a socket and then dumps its information to userspace. Split it into a part that finds the socket and a part that dumps the information. Signed-off-by:
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David S. Miller authored
Tom Herbert says: ==================== ila: Optimization to preserve value of early demux In the current implementation of ILA, LWT is used to perform translation on both the input and output paths. This is functional, however there is a big performance hit in the receive path. Early demux occurs before the routing lookup (a hit actually obviates the route lookup). Therefore the stack currently performs early demux before translation so that a local connection with ILA addresses is never matched. Note that this issue is not just with ILA, but pretty much any translated or encapsulated packet handled by LWT would miss the opportunity for early demux. Solving the general problem seems non trivial since we would need to move the route lookup before early demx thereby mitigating the value. This patch set addresses the issue for ILA by adding a fast locator lookup that occurs before early demux. This done by hooking in to NF_INET_PRE_ROUTING For the backend we implement an rhashtable that contains identifier to locator to mappings. The table also allows more specific matches that include original locator and interface. This patch set: - Add an rhashtable function to atomically replace and element. This is useful to implement sub-trees from a table entry without needing to use a special anchor structure as the table entry. - Add a start callback for starting a netlink dump. - Creates an ila directory under net/ipv6 and moves ila.c to it. ila.c is split into ila_common.c and ila_lwt.c. - Implement a table to do identifier->locator mapping. This is an rhashtable (in ila_xlat.c). - Configuration for the table with netlink. - Add a hook into NF_INET_PRE_ROUTING to perform ILA translation before early demux. Changes in v2: - Use iptables targets instead of a new xfrm function Changes in v3: - Add __rcu to next pointer in struct ila_map Changes in v4: - Use hook for NF_INET_PRE_ROUTING Changed in v5: - Register hooks per namespace using nf_register_net_hooks - Only register hooks when first mapping is actually added Changed in v6: - Remove gfp argument in alloc_ila_locks, it is unnecessary - Set registered_hooks properly when hooks are registered Testing: Running 200 netperf TCP_RR streams No ILA, baseline 79.26% CPU utilization 1678282 tps 104/189/390 50/90/99% latencies ILA before fix (LWT on both input and output) 81.91% CPU utilization 1464723 tps (-14.5% from baseline) 121/215/411 50/90/99% latencies ILA after fix 80.62% CPU utilization 1622985 (-3.4% from baseline) 110/191/347 50/90/99% latencies ==================== Signed-off-by: -
Tom Herbert authored
This patch implements an ILA tanslation table. This table can be configured with identifier to locator mappings, and can be be queried to resolve a mapping. Queries can be parameterized based on interface, direction (incoming or outoing), and matching locator. The table is implemented using rhashtable and is configured via netlink (through "ip ila .." in iproute). The table may be used as alternative means to do do ILA tanslations other than the lw tunnels Signed-off-by:
Tom Herbert <tom@herbertland.com> Signed-off-by:
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Tom Herbert authored
The start callback allows the caller to set up a context for the dump callbacks. Presumably, the context can then be destroyed in the done callback. Signed-off-by:
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Tom Herbert authored
Add the rhashtable_replace_fast function. This replaces one object in the table with another atomically. The hashes of the new and old objects must be equal. Signed-off-by:
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Tom Herbert authored
Create ila directory in preparation for supporting other hooks in the kernel than LWT for doing ILA. This includes: - Moving ila.c to ila/ila_lwt.c - Splitting out some common functions into ila_common.c Signed-off-by:
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David S. Miller authored
Merge branch 'stmmac-mdio-compat' Phil Reid says: ==================== stmmac: create of compatible mdio bus for stmacc driver Provide ability to specify a fixed phy in the device tree and retain the mdio bus if no phy is found. This is needed where a dsa is connected via a fixed phy and uses the mdio bus for config. Fixed ptp ref clock calculatins for the stmmac when ptp ref clock is running at <= 50Mhz. Also add device tree setting to config ptp clk source on socfpga platforms. Changes from V5: - Restore behaviour of unregister mdio bus when no phys found if there is no device tree node create the bus. - Modify condition to allocate mdio_base_data conditional on fixed phy presece as well. Maintains existing behaviour in conditions where a fixed phy is not present. Changes from V4: - Restore #ifdef CONFIG_OF around setting of reset_gpio. Member doesn't exist when this isn't defined. Changes from V3: - Use if (IS_ENABLED(CONFIG_OF)) instead of #if. Reorder some code to reduce if statements. - of_mdiobus_register already falls back to mdiobus_register - Tested on system with CONFIG_OF Changes from V2: - Formatting, spaces & lines > 80 chars. Using checkpatch - Drop PTP register debugfs patch. Changes from V1: - Fixed mismatch doc / code for ptp_ref_clk dt node. - Remove unit address from doc example. ==================== Signed-off-by: -
Phil Reid authored
Provides an options to use the ptp clock routed from the Altera FPGA fabric. Instead of the defalt eosc1 clock connected to the ARM HPS core. This setting affects all emacs in the core as the ptp clock is common. Acked-by:
Rob Herring <robh@kernel.org> Signed-off-by:
Phil Reid <preid@electromag.com.au> Acked-by:
Dinh Nguyen <dinguyen@opensource.altera.com> Signed-off-by:
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Phil Reid authored
stmmac_config_sub_second_increment set the sub second increment to 20ns. Driver is configured to use the fine adjustment method where the sub second register is incremented when the acculumator incremented by the addend register wraps overflows. This accumulator is update on every ptp clk cycle. If a ptp clk with a period of greater than 20ns was used the sub second register would not get updated correctly. Instead set the sub sec increment to twice the period of the ptp clk. This result in the addend register being set mid range and overflow the accumlator every 2 clock cycles. Signed-off-by:
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Phil Reid authored
devm_get_clk looks in clock-name property for matching clock. the ptp_ref_clk property is ignored. Acked-by:
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Phil Reid authored
The DSA driver needs to be passed a reference to an mdio bus. Typically the mac is configured to use a fixed link but the mdio bus still needs to be registered so that it con configure the switch. This patch follows the same process as the altera tse ethernet driver for creation of the mdio bus. Acked-by:
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- 15 Dec, 2015 5 commits
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David S. Miller authored
Tom Herbert says: ==================== net: The beginning of the end for NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM Background: This patch set starts to address one front in the battle against protocol ossification. Protocol ossification describes the state that we have arrived at in the evolution of the Internet where we are materially limited to only using a very narrow range of protocols and protocol features. For instance, only TCP and UDP is sufficiently supported on the Internet so that deploying alternative protocols, such as SCTP and DCCP, are non-starters. Similarly, IP options and IPv6 extension headers are typically not considered feasible for wide deployment, so we have loss the extensibility of IP protocols. Protocol ossification is not only a problem on the Internet, but in the data center as well. A root cause of this seems to be narrow, protocol specific optimizations implemented in switches (for doing EMCP) and in NICs (NIC offloads). These tend to be performance optimization around TCP and UDP packets, and these have become requirements to implement performant network solutions at scale. Attempts to deal with protocol ossification in data center have yielded ad hoc, sub-optimal solutions. A main driver of foo-over-UDP (e.g. GRE/UDP, MPLS/UDP) is to leverage the existing EMCP and RSS support for UDP by setting the source port as an entropy value. This has seen some success, but the cost of additional overhead and layering limits its usefulness. An even more extreme solution is STT where non-TCP packets are spoofed as TCP to leverage NIC offloads. This patch set endeavours to address protocol ossification caused by techniques used in transmit checksum offload for NICs. Future work will address protocol ossification in the other primary NIC offloads-- namely receive checksum offload, LSO, LRO, and RSS. NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM: NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM exemplify the problem of protocol ossification. These features are relics from a simpler time in the Internet, before encapsulation, before GRE and IPIP. Many hardware vendors only saw the need to provide checksum offload for simple UDP and TCP packets over IPv4 (IPv6 support is an afterthought also). In today's Internet and data centers, checksum offload is well established as a valuable feature, but we can no longer afford to be contsrained to use a handful of protocols and features that are supported at the discretion of NIC vendors. Generic and protocol agnostic methods are needed. The actual interface that the stack uses with drivers for checksum offload is CHECKSUM_PARTIAL. This is a generic and protocol agnostic interface. A driver for a device that supports this generic interface advertises NETIF_F_HW_CSUM. Goals of this patch set: We propose that drivers advertise NETIF_F_HW_CSUM instead of protocol specific values of NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM. If the driver's device is constrained (for instance it can only offlaod simple IPv4 and IPv6 packets) then these constraints can be checked in the transmit path and skb_checksum_help would be called for packets that the driver is unable to offload. In order to facilitate this, we add some helper functions that takes a specification argument indicating the type of packets a device is able to offload. If a packet does not match the specification, the helper function calls skb_checksum_help. Benefits of this approach are: - Simplify the stack and clarify the interface for checksum offload - Encourage NIC vendors to implement the generic. protocol agnostic checksum offload methods in hardware - Encourage feature parity in NIC offloads for IPv4 and IPv6 Many drivers advertise NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM and it probably isn't feasible to convert them all in a given time frame (although if we could this would be a great simplification to the stack). A reasonable direction may be to declare that new drivers must use NETIF_F_HW_CSUM as NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM are considered deprecated. There is a class of drivers that should now be converted to advertise NETIF_F_HW_CSUM, namely those that support offload of ecapsulated checksums. These drivers have to date been using skb->encapsulation to infer that checksum offload is being performed for an encapsulated checksum. This is strictly not correct. skb->encapsulation indicates that the inner headers are valid in the skbuff, whereas the stack indicates checksum offload arguments exclusively in csum_start and csum_offset. At some point we may want to set the inner headers for an skbuff but offload the outer transport checksum, so this needs to be fixed. In this patch set: - Rename some of constants involved in checksum offload to be more reflective of their function - Eliminate NETIF_F_GEN_CSUM and NETIF_F_V[46]_CSUM entirely as unnecessary convolutions - Fix conditions in tcp_sendpage and tcp_sendmsg to take IP protocol into account when determining if checksum offload can be done - Add driver helper functions for determining if a checksum can be offloaded to a device. If not, the helper function can call skb_checksum_help - Document the checksum offload interface between the stack and drivers with detail and specifics Testing: Have been testing ixgbe and mlx4. No noticeable regressions seen yet. ==================== Signed-off-by: -
Tom Herbert authored
Add specifics and details the description of the interface between the stack and drivers for doing checksum offload. This description is meant to be as specific and complete as possible. Signed-off-by:
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Tom Herbert authored
Add skb_csum_offload_chk driver helper function to determine if a device with limited checksum offload capabilities is able to offload the checksum for a given packet. This patch includes: - The skb_csum_offload_chk function. Returns true if checksum is offloadable, else false. Optionally, in the case that the checksum is not offloable, the function can call skb_checksum_help to resolve the checksum. skb_csum_offload_chk also returns whether the checksum refers to an encapsulated checksum. - Definition of skb_csum_offl_spec structure that caller uses to indicate rules about what it can offload (e.g. IPv4/v6, TCP/UDP only, whether encapsulated checksums can be offloaded, whether checksum with IPv6 extension headers can be offloaded). - Ancilary functions called skb_csum_offload_chk_help, skb_csum_off_chk_help_cmn, skb_csum_off_chk_help_cmn_v4_only. Signed-off-by: -
Tom Herbert authored
In tcp_send_sendpage and tcp_sendmsg we check the route capabilities to determine if checksum offload can be performed. This check currently does not take the IP protocol into account for devices that advertise only one of NETIF_F_IPV6_CSUM or NETIF_F_IP_CSUM. This patch adds a function to check capabilities for checksum offload with a socket called sk_check_csum_caps. This function checks for specific IPv4 or IPv6 offload support based on the family of the socket. Signed-off-by:
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Tom Herbert authored
These netif flags are unnecessary convolutions. It is more straightforward to just use NETIF_F_HW_CSUM, NETIF_F_IP_CSUM, and NETIF_F_IPV6_CSUM directly. This patch also: - Cleans up can_checksum_protocol - Simplifies netdev_intersect_features Signed-off-by:
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