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 [thread overview]
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
mbuf-ol_flags = RTE_MBUF_F_TX_IPV4 | RTE_MBUF_F_TX_TCP_CKSUM
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?
Thanks,
Jinag.
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next 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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