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net: checksum: Introduce fine control over checksum type

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At present net_checksum_calculate() blindly calculates all types of
checksums (IP, TCP, UDP). Some NICs may have a per type setting in
their BDs to control what checksum should be offloaded. To support
such hardware behavior, introduce a 'csum_flag' parameter to the
net_checksum_calculate() API to allow fine control over what type
checksum is calculated.

Existing users of this API are updated accordingly.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Bin Meng 2020-12-11 17:35:12 +08:00 • committed by Jason Wang
parent d97f11590a
commit f574633529
10 changed files with 55 additions and 33 deletions
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2
hw/net/virtio-net.c
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@ -1464,7 +1464,7 @@ static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
(buf[23] == 17) && /* ip.protocol == UDP */
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
net_checksum_calculate(buf, size);
net_checksum_calculate(buf, size, CSUM_UDP);
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
}
}