spu2_fmd_ctrl2_write(9)

💖 spu2_fmd_ctrl2_write(9) 💖

okay bestie, welcome to the Kernel API Manual page for spu2_fmd_ctrl2_write(9) — we're setting the ctrl2 field inside the fixed metadata field of the SPU2 header, and it's giving ✨kernel crypto✨. 🦋

✨ NAME ✨

spu2_fmd_ctrl2_write — sets the ctrl2 field in the fixed metadata field of the SPU2 header. Literally that's the job, no cap. 💅

🌸 SYNOPSIS 🌸

void spu2_fmd_ctrl2_write (struct SPU2_FMD *fmd , u64 cipher_offset ,
u64 auth_key_len , u64 auth_iv_len , u64 cipher_key_len , u64
cipher_iv_len );

🎀 ARGUMENTS 🎀

• fmd — start of the FMD field to be written. This is the spot you're writing into. 🫶
• cipher_offset — number of bytes from Start of Packet (end of FD field) where data to be encrypted or decrypted begins. That's the starting line for the cipher data. 🔥
• auth_key_len — length of authentication key, in bytes.
• auth_iv_len — length of authentication initialization vector, in bytes.
• cipher_key_len — length of cipher key, in bytes.
• cipher_iv_len — length of cipher IV, in bytes.

👑 SEE ALSO 👑

Kernel file: ./drivers/crypto/bcm/spu2.c — and here's the whole function friend group, all invited to the group chat: 💬

• spu2_cipher_xlate(9)
• spu2_hash_xlate(9)
• spu2_fmd_init(9)
• spu2_fmd_ctrl0_write(9)
• spu2_fmd_ctrl1_write(9)
• spu2_fmd_ctrl3_write(9)
• spu2_ctx_max_payload(9)
• spu2_payload_length(9)
• spu2_response_hdr_len(9)
• spu2_hash_pad_len(9)
• spu2_gcm_ccm_pad_len(9)
• spu2_assoc_resp_len(9)
• spu2_aead_ivlen(9)
• spu2_hash_type(9)
• spu2_digest_size(9)
• spu2_create_request(9)
• spu2_cipher_req_init(9)
• spu2_cipher_req_finish(9)
• spu2_request_pad(9)
• spu2_xts_tweak_in_payload(9)
• spu2_tx_status_len(9)
• spu2_rx_status_len(9)
• spu2_status_process(9)
• spu2_ccm_update_iv(9)
• spu2_wordalign_padlen(9)

🫶 that's the whole page, bestie — source/version: ./drivers/crypto/bcm; date: October 2026; and yes, we're still in spu2_fmd_ctrl2_write(9) land. 💖