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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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20
hw/net/imx_fec.c
View file

@ -561,22 +561,18 @@ static void imx_enet_do_tx(IMXFECState *s, uint32_t index)
ptr += len;
frame_size += len;
if (bd.flags & ENET_BD_L) {
int csum = 0;
if (bd.option & ENET_BD_PINS) {
struct ip_header *ip_hd = PKT_GET_IP_HDR(s->frame);
if (IP_HEADER_VERSION(ip_hd) == 4) {
net_checksum_calculate(s->frame, frame_size);
}
csum |= (CSUM_TCP | CSUM_UDP);
}
if (bd.option & ENET_BD_IINS) {
struct ip_header *ip_hd = PKT_GET_IP_HDR(s->frame);
/* We compute checksum only for IPv4 frames */
if (IP_HEADER_VERSION(ip_hd) == 4) {
uint16_t csum;
ip_hd->ip_sum = 0;
csum = net_raw_checksum((uint8_t *)ip_hd, sizeof(*ip_hd));
ip_hd->ip_sum = cpu_to_be16(csum);
}
csum |= CSUM_IP;
}
if (csum) {
net_checksum_calculate(s->frame, frame_size, csum);
}
/* Last buffer in frame. */
qemu_send_packet(qemu_get_queue(s->nic), s->frame, frame_size);