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hw/net/net_tx_pkt: Implement TCP segmentation

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There was no proper implementation of TCP segmentation before this
change, and net_tx_pkt relied solely on IPv4 fragmentation. Not only
this is not aligned with the specification, but it also resulted in
corrupted IPv6 packets.

This is particularly problematic for the igb, a new proposed device
implementation; igb provides loopback feature for VMDq and the feature
relies on software segmentation.

Implement proper TCP segmentation in net_tx_pkt to fix such a scenario.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Akihiko Odaki 2023-02-23 19:20:09 +09:00 • committed by Jason Wang
parent ffbd2dbd8e
commit 02ef5fdc09
3 changed files with 207 additions and 75 deletions
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5
include/net/eth.h
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@ -400,11 +400,6 @@ void eth_get_protocols(const struct iovec *iov, int iovcnt,
eth_ip4_hdr_info *ip4hdr_info,
eth_l4_hdr_info *l4hdr_info);
void eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len,
void *l3hdr, size_t l3hdr_len,
size_t l3payload_len,
size_t frag_offset, bool more_frags);
void
eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len);