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Sometimes your computer may generate an error code that the checksum has been downloaded from rx tx. There can be many reasons for this error to appear. The interface for dumping the device monitor checksum is detailed in the comments next to the specific start of include/linux/skbuff. H In Swift, allow the program to uniquely request the padding checksum corresponding to the digital farmland skb->sk_buff csum_start and skb->csum_offset.

Poll mode driver support for L3/L4 RX/TX checksum offload functions includes:

Check the IPv4 checksum of received packets yourself. UDP/TCP/SCTP

Check the hardware-generated checksum for received packets.

Hardware checksum application in ipv4 transmitted packets. Author

Checksum of the process of inserting materials into ipv4/udp forwarded control packets

Insert the IPv4/TCP sums of the specified packets into the equipment.

The amount of IPv4/SCTP insertion hardware control as part of the transfer (sctpPacket length in bytes) five.

Insert ipv6/udp checksums into packets sent.

Hardware control of the IPv6/TCP insert amount that packets are passed over.

Summary check of IPv6/SCTP, inserts sent by PC to Des (sctppacket length in bytes).

Side Rx, hardware-generated L3/L4 checksum dump, can be enabled withfollowing command from testp applicationmd:

TX side, L3/L4 checksum insertion can be equipped withfollowing command from application testpmd and run best in dedicated environmentchecksum mode tx:

Packet transfer is actually done by start because of testpmd.An application that receives boxes and then sends the package to everyone outsideconfigured ports. The mask used specifies which hardware checksumOffloading usually requires port_id to be enabled. Please refer to data sheet for nicrelevant hardware limits:

define csumtx_checksum fwd set port_id mask

Insert bit 0 - offload IP checksum if setInsert bit for 1 UDP checksum offload if setBit 2 Enable - Offload TCP checksum if setBit 3 Include - Sctp checksum offload whether it is set or not

3.1.Using Vfio¶

If used, the specific kernel must be >= 3.6+ VT-d and must be enabled in regards to the BIOS.If in using vfio, use the following boot commands to bind the vfio driver.per device:

Assume, under test, that ports 0 and 2 are connected to a traffic generator,Run testpmd with the following arguments:

Set this verbosity level to 1 to display information about each packet received:

modprobe vfiomodprobe vfio-pciusertools/dpdk-devbind.--bind=vfio-pci device bus identifier py

.-n /build/app/dpdk-testpmd -cffffff unique -- -i --burst=1 n--txht=8 --txpt=32 --txwt=0 --txfreet=0 --rxfreet=64 --mbcache=250 --portmask=0x5enable-rx-cksum

3.2. From Test Case Check: Checksum Of Received Packet¶

Configure each traffic to the generator to send packets with the followingCombination: good/bad Internet protocol address checksum + good/bad UDP/TCP checksum.

Excluding the SCTP header + payload length must be a multiple of several bytes.The IPv4+ udp/tcp packet length may differ from the minimum length of 1518 bytes.

Then check how many bad-ipcsum or bad-l4csum boxes have been found:

testpmd> specified fwd csum  Sets how to send csum packets

Run

testpmd>  Submit package csum - CRC removal disabled - packages/burst = 32  nb send cores = 1 - nb send ports = 10 Queues RX = 1 - Description RX = 128 - RX Inactivity Threshold = 64  Receive threshold register: pthresh=8 hthresh=8 wthresh=4  Queues TX = 1 Desc - = Colorado 512 Frontal - TX Idle Threshold = 0  TX threshold register: pthresh=32 hthresh=8 wthresh=8

Stop

testpmd>---------------------- Transfer statistics for port 2 ---------------------- -Packets RX: 0 Lost RX: none Total RX: 0Bad ipcsum: 0 Bad l4csum: 0Packets TX: 1 Dropped TX: 0 Total TX: 0-------------------------------------------------- ------------------------------------

3.3. Test Case: Include A UDP/TCP/SCTP Checksum On Your Sender’s Ipv4/ipv6¶

Configure packet aggregation to send multiple packets associated with the following IPv4/UDP.Combination: IPv4/TCP, IPv4/SCTP, IPv6/UDP, IPv6/TCP.

Except that the SCTP header + payload area must be one of several 4 bytes.IPv4 + udp/tcp packet spacing can be reduced from the minimum size to 1518 bytes.

Then check that this number of packets is correctly received in trafficeside of the generator. And need IPv4 checksum TCP, checksum, UDP checksum, SCTP CRC32cbe confirmed as compliant by IXIA.

testpmd> install fwd csumSet csum packet forwarding mode

testpmd> tx_checksum fix 0xf 0start transferring testpmd> csum Burst - CRC suppression disabled - packages/burst = 32  nb transmission cores = 1 - nb transmission ports = 10  Queues RX = 1 - Description RX = 128 - Reserve Threshold RX = 64  Receive threshold register: pthresh=8 hthresh=8 wthresh=4  Queues = tx 1 TX - desc = 512 TX - completely free threshold = 0  TX threshold register: pthresh=32 hthresh=8 wthresh=8

3.4. Do-Case Test: Do Not Weight IPv4/IPv6 UDP/TCP Checksum In Live Packet¶

Configure the traffic generator to serve the next few IPv4/UDP packets.Combination: IPv4/TCP, IPv6/UDP, IPv6/TCP.

IPv4 + UDP/TCP packet lengths can vary from indisputable to a minimum of 1518 bytes.

Then check if the same number of packets are received in the traffic generator.side. And need IPv4 checksum, TCP checksum, UDP checksumbe tested over time as well as the existing ixia. First

Byte due to address is ipv4 source, intriggered by testpmd.Checksumsometimes recalculated by software algorithms.

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Dechargement De La Somme De Controle Rx Tx
Checksum Offload Rx Tx
체크섬 오프로드 Rx Tx
Suma Kontrolna Odciazenia Rx Tx
Descarga De Suma De Comprobacion Rx Tx
Checksumma Avlastning Rx Tx
Prufsummen Offload Rx Tx
Checksum Scarica Rx Tx
Checksum Offload Rx Tx
Razgruzka Kontrolnoj Summy Rx Tx