calc_txlen(9)

💖 calc_txlen(9) — the Kernel API Manual page, but make it make sense 💖

okay bestie, so this is calc_txlen(9) from the Kernel API Manual, and honestly? It's a tiny little function with main character energy. Let's get into it 🫶

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✨ NAME ✨

calc_txlen — no cap, this one just calculates the size of a message to send packet. That's it. That's the whole vibe check. 💅

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🌸 SYNOPSIS 🌸

unsigned int calc_txlen (unsigned int len );

literally just one argument, one return. lowkey elegant, ngl 🔥

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🎀 ARGUMENTS 🎀

• len — the length of data. yep, that's the one job. she's giving "simple, focused, knows what she wants" 💜

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🦋 DESCRIPTION 🦋

so what does she actually do? calc_txlen returns the size of the TXFIFO message you need in order to send this packet. that's it, that's the whole function. one job, done well, periodt ✨

think of it like the logistics bestie who tells you exactly how big the envelope needs to be before you mail the thing 📬 — it's not glamorous work but it's essential and we stan 🍓

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👑 SEE ALSO 👑

if you wanna go down the rabbit hole (and you should, iykyk), go look at the kernel file ./drivers/net/ethernet/micrel/ks8851_spi.c and also literally all of these:

• struct ks8851_net_spi(9)
• ks8851_lock_spi(9)
• ks8851_unlock_spi(9)
• ks8851_wrreg16_spi(9)
• ks8851_rdreg(9)
• ks8851_rdreg16_spi(9)
• ks8851_rdfifo_spi(9)
• ks8851_wrfifo_spi(9)
• ks8851_tx_work(9)
• ks8851_flush_tx_work_spi(9)
• ks8851_start_xmit_spi(9)

like… that's a whole friend group right there and calc_txlen is the one who shows up early with snacks 😭💖

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ok that's the page!! tiny but iconic 🧚

and for the sign-off: this gem lives in ./drivers/net/ethernet/micrel, dated October 2026, and it's filed under calc_txlen(9). slay, go read some kernel source bestie 💅🌈⭐