i40e_diag_reg_test(9)

💅 i40e_diag_reg_test 💅

okay bestie, so this is i40e_diag_reg_test, and it lives in section 9 of the Kernel API Manual — that's the kernel-functions-for-devs section, iykyk ✨. It's one of those little Intel i40e diagnostic helpers, and honestly she's lowkey iconic for what she does.

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🌸 NAME 🌸

i40e_diag_reg_test — no long fancy subtitle here, the original literally just leaves it blank after the dash, so I'm not gonna invent one for you 🫶. The name says it all, periodt.

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✨ SYNOPSIS ✨

int i40e_diag_reg_test (struct i40e_hw *hw );

so it returns an int and takes exactly one arg. that's the whole vibe check right there 💜

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🎀 ARGUMENTS 🎀

• hw — this is the pointer to the hw struct. like, the hardware struct. she's holding the tea on the device, and you gotta hand her over. no hw, no test, fr fr 🙈

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🦋 DESCRIPTION 🦋

so what does she actually do? she performs the registers diagnostic test 🔥. that's it, that's the whole description — she goes in and does the register diagnostic thing. no extra lore in the original, so no extra lore from me, ngl. just know that when you need the registers checked, this is the girl you call 💅✨

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🌈 SEE ALSO 🌈

• the kernel file, exactly here: ./drivers/net/ethernet/intel/i40e/i40e_diag.c — that's her home address, go say hi 🏠
• i40e_diag_reg_pattern_test(9) — her bestie, the pattern-testing one 🎀
• i40e_diag_eeprom_test(9) — and the eeprom-testing one, completing the squad 🫶

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ok tiny heads-up: the original page doesn't say what the return values mean or what happens on failure, so I'm not gonna make anything up. read the source, bestie, that's the move 📖💀

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and that's the whole page, no cap 🧚‍♀️ this cutie comes to you from ./drivers/net/ethernet/intel/i40e, dated October 2026, and she answers to i40e_diag_reg_test(9). slay, go run your diagnostics 💖⭐👑