TXP(4)

💅 TXP(4) — 3Com 3XP Typhoon/Sidewinder (3CR990) Ethernet interface

okay so this is a page from the Kernel Interfaces Manual, bestie, and it's literally all about the txp driver. buckle up 💖

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✨ NAME ✨

txp — the 3Com 3XP Typhoon/Sidewinder (3CR990) Ethernet interface, aka the driver that makes your network card go brrr 🦋

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✨ SYNOPSIS ✨

txp* at pci? dev ? function ?

no cap, that's the whole vibe check: it attaches at pci? with a dev ? and a function ? 🎀

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✨ DESCRIPTION ✨

so the txp interface is your ✨access pass✨ to 10Mb/s and 100Mb/s Ethernet networks via the 3Com Typhoon/Sidewinder chipset, and she supports these cards, periodt:

• 3Com 3CR990-TX-95
• 3Com 3CR990-TX-97
• 3Com 3CR990SVR95
• 3Com 3CR990SVR97

you get basic Ethernet functions (obviously 💅) plus support for vlan(4) tag removal and insertion assistance, receive ip(4), tcp(4) and udp(4) checksum offloading, and transmit ip(4) checksum offloading. iconic behavior, honestly 👑

but listen — there is currently no support for transmit tcp(4) or udp(4) checksum offloading, tcp(4) segmentation, nor ipsec(4) acceleration. don't come for her, she's doing her best 😭

also highkey important: hardware checksumming is only used when the interface is not in bridge(4) mode. note it, screenshot it, remember it 🫶

each of the host's network addresses is specified at boot time with an SIOCSIFADDR ioctl(2). and the txp interface employs the address resolution protocol described in arp(4) to dynamically map between Internet and Ethernet addresses on the local network — so yeah, she knows who everyone is on your LAN 🧚

when a txp interface is brought up, by default it will attempt to auto-negotiate the link speed and duplex mode. the speeds, in order of attempt, are literally:

1. 100Mb/s Full Duplex
2. 100Mb/s Half Duplex
3. 10 Mb/s Full Duplex
4. 10 Mb/s Half Duplex

the txp supports several media types, which are selected via the ifconfig(8) command. the supported media types are, in all their glory:

• media autoselect — attempt to autoselect the media type (this is the default, fyi ⭐)
• media 100baseTX mediaopt full-duplex — use 100baseTX, full duplex
• media 100baseTX [mediaopt half-duplex] — use 100baseTX, half duplex
• media 10baseT mediaopt full-duplex — use 10baseT, full duplex
• media 10baseT [mediaopt half-duplex] — use 10baseT, half duplex

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🌸 SEE ALSO 🌸

arp(4), ifmedia(4), inet(4), intro(4), ip(4), netintro(4), pci(4), tcp(4), udp(4), vlan(4), ifconfig(8)

go read them, iykyk 📚✨

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🦋 HISTORY 🦋

the txp driver first appeared in NetBSD 2.0. a legend from the jump 💀🔥

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and that's the page, bestie!! this cutie came from Debian, dated August 21, 2003 — like, she's vintage and she still slays 🌈💜 bye ily 🫶