fbnic_csr_regs_test(9)

✨ fbnic_csr_regs_test ✨

okay bestie, so this one lives in the kernel API manual — section 9 of the manual pages, if you're keeping track 🎀 — and it's literally called fbnic_csr_regs_test. Let's get into it 💅

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🌸 NAME 🌸

fbnic_csr_regs_test — verify behavior of NIC registers ✨

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🦋 SYNOPSIS 🦋

enum fbnic_reg_self_test_codes fbnic_csr_regs_test (struct fbnic_dev
*fbd );

like, yes, it returns an enum fbnic_reg_self_test_codes and yes it takes one struct fbnic_dev *. iconic signature, no notes 🫶

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💖 ARGUMENTS 💖

• fbd — the device to test 💻 like, this is the NIC you're putting under the microscope, bestie.

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👑 DESCRIPTION 👑

so this function is meant to test the bit values of all the various registers in the NIC device 🔥 specifically, it verifies which bits are writable and which ones are not, which is lowkey the most important vibe check a register can get.

the way it does this? it writes varying patterns of bits to the registers, testing for sticky bits, or bits that are writable but should not be 🙈 and like… those are the sneaky ones, bestie. not them being writable when they shouldn't be 💀 this test catches them, periodt.

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🌈 RETURN 🌈

• FBNIC_REG_TEST_SUCCESS — slay, it passed 💖
• register number — on failure, so it tells you which register was giving main character energy and misbehaving 😭

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/net/ethernet/meta/fbnic/fbnic_csr.c — the whole lore is in there, iykyk 📖

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ngl if a bit is writable that has no business being writable, this test will find it. no cap. 🧚

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and that's the page, bestie 🎀 this one comes from ./drivers/net/ethernet/meta/fbnic, dated October 2026 — go off, meta networking era 💜✨🌸