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If your system has IP proxy checksum offloading, we hope this guide will help you. g.The TCP Checksum Offload option allows the NIC to complete the TCP checksum on send and receive, preventing the AIX CPU from calculating the checksum. The savings depend on the size of the package. Small packages have little or no savings with this particular option, while large packages have large physical savings.

 

 

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Presentation¶

This written document describes a number of techniques in the current Linux networking stack to enableUse the checksum offloading functions of various network adapters.

• Transfer checksum exchange

• LCO: local exchange checksum

• RCO: Remote Checksum Download

• Converting RX Checksum

TX Download

Checksum_ Optional Upload Checksum¶

Checksum transmission interfaces sending to the device is now explained inDetails in the comments next to include / linux / skbuff.h.

In short, the device allows it to ask to fill a joint supplementThe checksum is determined by the fields sk_buff skb-> csum_start or skb-> csum_offset.The device must compute a 16-bit one’s complement checksum (i.e.Checksum “IP-style”) csum_start to be the end of the packet and type imResult in (csum_start + csum_offset).

Since csum_offset cannot be negative, this ensures that the previous valuethe checksum field is included in the checksum calculation, so it can be usedto make any corrections necessary for the successful completion of the checksum verification (for example, the sumPseudo-header for UDP or TCP).

This interface allows only one checksum to be exchanged. OrEncapsulation is used, the packet will likely contain multiple checksumsdifferent header-clleular-layer fields and the rest must be edited by anotherA mechanism like LCO and maybe RCO.

CRC32c can also be exchanged via this linkterface by fillingskb-> csum_start then skb-> csum_offset as above and installskb-> csum_not_inet: see the comment on skbuff.h (section “D”) for more details. Unloading

unbound, IP header checksum ok; this is always done inSoftware. This is good, because when we create the IP header, we clearly have it.in the cache, so it’s not expensive overall. It’s pretty short too.

GSO requirements are much more complex than segmentation requirements.an encapsulated packet, you may need to handle internal and external checksums, orat the same time it is recalculated for the resulting segment. See skbuff.h overview (section “E”)More details.

The driver declares unloading capabilities in netdev-> hw_features; Features seeNetdev chaos and how to get out of this situation alive, to find out more. Please note that you are walking from the devicewhich only declares NETIF_F_IP [V6] _CSUM should always consider csum_start andcsum_offset specified in the SKB; when he tries to deduce it just from the material(as is the case with some network cards) the rider mustcheck if the values ​​of all SKBs are the samethe ones that are accounted for by the hardware, and if not, make sure you have the checksum inSoftware instead (using skb_csum_hwoffload_help () or whatever comes withskb_checksum_help () / skb_crc32c_csum_help as shown ininclude / linux / skbuff.h).

For the most part, the stack should assume that a checksum dump is supported.through a hidden device. The only place to check isValidate_xmit_skb () and the functions it addresses directly or indirectly. ThisThe function compares the unloading functions requested (which skb can accommodateoffloads other than TX Checksum Offload), and if they are not subsidized orenabled on device (defined by netdev-> features) it worksappropriate outsourcing in software. In the specific case TX Checksum Offload give it a namemeans skb_csum_hwoffload_help (skb, features).

LCO: Dump Local Checksum¶

LCO is any method for efficiently calculating the checksum of an area froman encapsulated datagram if an embedded checksum exchange is required.

Cost prA properly formatted TCP or UDP checksum of the packet, padded with the same.in addition to any pseudo-header amount, because otherwise the factor”Erased” due to the specialty of the checksum. This is because the total amount wasbefore it is written in the checksum field.

In general, this certainly applies to where the IP style complementsThe checksum is used like any checksum supported by the TX Checksum Offload function.

This means that if we have defined TX checksum offload with a start / shift partner,keep in mind that after the device has completed this checksum, they are linked to the sumcsum_start at the end of the field corresponds to a food additivewhat value we previously put in the checksum sphere. This allows usAlso calculating the checksum regardless of our payload – we just stopsum when we arrive so that it becomes csum_start then add padding to the word, probably 16 bitsin (csum_start + csum_offset).

Then, when normally the true internal checksum is reached in relation to (either based on or according to materialsskb_checksum_help ()), an external checksum is providedArithmetic.Est

lco is executed by the stack when the external UDP header for the file. createdEncapsulated in it as VXLAN or GENEVE, in udp_set_csum (). Likewise forIPv6 equivalents in udp6_set_csum ().

It is also executed when the IPv4 GRE header is created innetwork / ipv4 / ip_gre.c: build_header (). In the meantime, this fails ifCreate an IPv6 GRE header; some GRE checksum is computed over the setPackage in net / ipv6 / ip6_gre.c: ip6gre_xmit2 (), but should be used realisticallyLCO because IPv6 GRE uses an IP-style checksum.

All LCO implementations use the lco_csum () helper function ininclude / linux / skbuff.h.

LCO is likely to be used safely nested within encapsulation; in this case outsideThe encapsulation layer must add both its own title and a “middle” title.This means that our “middle” title will be summarized several times, butThere seems to be no tool to avoid this without higher costs.(for example, inflate in SKB).

RCO: Remote Unload ContactOf An Arbitrary Amount

The RCO must be a method that excludes the encapsulated datagram’s internal checksum.This means that the external checksum can be outsourced. However, it includesA modification of the encapsulation protocols that the recipient must also support.For this reason, it is disabled by default.

• https://tools.ietf.org/html/draft-herbert-remotecsumoffload-00

• https://tools.ietf.org/html/draft-herbert-vxlan-rco-00

In Linux, RCO is implemented individually in each encapsulation method, andMost tunnel types have indicators to track their actual usage. For example, VXLAN VXLAN_F_REMCSUM_TX hasFlag (with struct vxlan_rdst) to indicate which RCO it should be inUsed when sending to a specific remote destination.

 

 

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