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From: "jiangheng (H)" <jiangheng12@huawei.com>
To: "users@dpdk.org" <users@dpdk.org>
Subject: [dpdk-users] DPDK RX TCP checksum failed
Date: Sat, 26 Mar 2022 08:13:21 +0000
Message-ID: <cb53d6174669407b96a0f6a09d6bf134@huawei.com> (raw)

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Hi all,

I tried using the checksum offloads feature in DPDK and it did not see working under virtual machine.

Port only support TCP checksum and do not support IP checksum:
rx_offload_capa = DEV_RX_OFFLOAD_TCP_CKSUM
tx_offload_capa = DEV_TX_OFFLOAD_TCP_CKSUM

so I config rxmode.offload txmode.offloads as below:
rxmode.offloads = DEV_RX_OFFLOAD_TCP_CKSUM
txmode.offloads = DEV_TX_OFFLOAD_TCP_CKSUM

For TX, I set the following parameters, it works good.
mbuf->l2_len = sizeof(*ethhdr)
mbuf->l3_len = ip header len

For RX, It will execute the following code:
In drivers/net/virtio/virtio_rxtx.c  virtio_rx_offload function :
    if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
        hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
        if (hdr->csum_start <= hdrlen && l4_supported) {
            m->ol_flags |= RTE_MBUF_F_RX_L4_CKSUM_NONE;
        } else {

m->ol_flags set to RTE_MBUF_F_RX_L4_CKSUM_NONE, causing the TCP RX checksum failed.
How do I avoid the above code going into this branch?


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             reply	other threads:[~2022-03-26  8:13 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-26  8:13 jiangheng (H) [this message]
2022-03-26 18:59 ` Stephen Hemminger
2022-03-28  1:50   ` 答复: " jiangheng (H)
2022-03-28  2:15     ` Harold Huang
2022-04-07 12:50       ` 答复: " jiangheng (H)
2022-03-28  3:11   ` fwefew 4t4tg
2022-04-07 13:42     ` 答复: " jiangheng (H)

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