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TCP congestion control fixes #18

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Merged
gasbytes merged 9 commits into from
Feb 5, 2026
Merged

TCP congestion control fixes #18

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6d87ec4
Fixed TCP sending fifo wrapping.
danielinux Feb 5, 2026
f517b8a
Added more unit test to extend coverage
danielinux Feb 5, 2026
5ffd145
Addressed copilot's review.
danielinux Feb 5, 2026
8e09fc5
Fixed fifo_space calculation
danielinux Feb 5, 2026
260cf44
TCP Congestion control fixes - part II
danielinux Feb 5, 2026
616fe51
Addressed reviewer's comment + made TAP non-blocking
danielinux Feb 5, 2026
a70c886
Addressed second round of Copilot reviews
danielinux Feb 5, 2026
47d4fef
fix unit tests
danielinux Feb 5, 2026
f3816bf
Addressed more reviewer's comments
danielinux Feb 5, 2026
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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ A single network interface can be associated with the device.
| **Transport** | UDP | Unicast datagrams, checksum | [RFC 768](https://datatracker.ietf.org/doc/html/rfc768) |
| **Transport** | TCP | Connection management, reliable delivery | [RFC 793](https://datatracker.ietf.org/doc/html/rfc793), [RFC 9293](https://datatracker.ietf.org/doc/html/rfc9293) |
| **Transport** | TCP Options: MSS | Maximum Segment Size negotiation | [RFC 793](https://datatracker.ietf.org/doc/html/rfc793) |
| **Transport** | TCP Options: Timestamps | RTT measurement, PAWS | [RFC 7323](https://datatracker.ietf.org/doc/html/rfc7323) |
| **Transport** | TCP Options: Timestamps | RTT measurement, PAWS, Window Scaling | [RFC 7323](https://datatracker.ietf.org/doc/html/rfc7323) |
| **Transport** | TCP Congestion Control | Slow start, congestion avoidance | [RFC 5681](https://datatracker.ietf.org/doc/html/rfc5681) |
| **Transport** | TCP Fast Retransmit | Triple duplicate ACK detection | [RFC 5681](https://datatracker.ietf.org/doc/html/rfc5681) |
| **Application** | DHCP | Client only (DORA) | [RFC 2131](https://datatracker.ietf.org/doc/html/rfc2131) |
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11 changes: 8 additions & 3 deletions src/port/posix/tap_linux.c
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Expand Up @@ -101,9 +101,14 @@ int tap_init(struct wolfIP_ll_dev *ll, const char *ifname, uint32_t host_ip)
tap_fd = -1;
}
}
if (tap_fd < 0) {
return -1;
}
if (tap_fd < 0) {
return -1;
}
{
int flags = fcntl(tap_fd, F_GETFL, 0);
if (flags >= 0)
(void)fcntl(tap_fd, F_SETFL, flags | O_NONBLOCK);
}
}
/* Get mac address */
if (ioctl(tap_fd, SIOCGIFHWADDR, &ifr) < 0) {
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