lpfc_read_sparam(9)

✨ lpfc_read_sparam ✨

okay so first things first — you found a page from the Kernel API Manual, section 9, and the function we're simping over is literally called lpfc_read_sparam. buckle up bestie 💖

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🌸 NAME 🌸

lpfc_read_sparam — prepare a mailbox command for reading HBA parameters 🎀

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🦋 SYNOPSIS 🦋

int lpfc_read_sparam (struct lpfc_hba *phba , LPFC_MBOXQ_t *pmb , int
vpi );

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💜 ARGUMENTS 💜

• phba — pointer to the lpfc hba data structure. that's the host bus adapter bestie, the whole main character 🫶
• pmb — pointer to the driver internal queue element for the mailbox command. it's the little envelope you're stuffing things into ✉️
• vpi — virtual N_Port identifier. yes, the vport's whole identity, iconic 👑

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🔥 DESCRIPTION 🔥

so the read service parameter mailbox command is literally the thing you use to read the HBA port service parameters. no cap. those service parameters get read straight into the buffer specified directly by a BDE in the mailbox command. and like… why do we care? because those service parameters may then be used to build the payload of an N_Port/F_POrt login request and reply (LOGI/ACC). it's giving "foundation of everything". slay 💅

this routine prepares the mailbox command for reading HBA port service parameters. the DMA memory is allocated in this function, and the addresses are populated into the mailbox command so the HBA can DMA the service parameters into it. not me doing allocation AND plumbing in one go — highkey efficient ✨

return codes, fr fr:

• 0 — Success 🎉
• 1 — DMA memory allocation failed 😭

heads up bestie: that 1 is a real failure path, not a vibe. if the DMA memory allocation doesn't happen, you get 1 back and you deal with it. 🙈

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🌈 SEE ALSO 🌈

the whole kernel file lives at ./drivers/scsi/lpfc/lpfc_mbox.c, and here's the entire squad — every single one of them, in order, no gatekeeping 🫶

• lpfc_mbox_rsrc_prep(9)
• lpfc_mbox_rsrc_cleanup(9)
• lpfc_dump_static_vport(9)
• lpfc_down_link(9)
• lpfc_dump_mem(9)
• lpfc_dump_wakeup_param(9)
• lpfc_read_nv(9)
• lpfc_config_async(9)
• lpfc_heart_beat(9)
• lpfc_read_topology(9)
• lpfc_clear_la(9)
• lpfc_config_link(9)
• lpfc_config_msi(9)
• lpfc_init_link(9)
• lpfc_unreg_did(9)
• lpfc_read_config(9)
• lpfc_read_lnk_stat(9)
• lpfc_reg_rpi(9)
• lpfc_unreg_login(9)
• lpfc_sli4_unreg_all_rpis(9)
• lpfc_reg_vpi(9)
• lpfc_unreg_vpi(9)
• lpfc_config_pcb_setup(9)
• lpfc_read_rev(9)
• lpfc_build_hbq_profile2(9)
• lpfc_build_hbq_profile3(9)
• lpfc_build_hbq_profile5(9)
• lpfc_config_hbq(9)
• lpfc_config_ring(9)
• lpfc_config_port(9)
• lpfc_kill_board(9)
• lpfc_mbox_put(9)
• lpfc_mbox_get(9)
• __lpfc_mbox_cmpl_put(9)
• lpfc_mbox_cmpl_put(9)
• lpfc_mbox_cmd_check(9)
• lpfc_mbox_dev_check(9)
• lpfc_mbox_tmo_val(9)
• lpfc_sli4_mbx_sge_set(9)
• lpfc_sli4_mbx_sge_get(9)
• lpfc_sli4_mbox_cmd_free(9)
• lpfc_sli4_config(9)
• lpfc_sli4_mbox_rsrc_extent(9)
• lpfc_sli_config_mbox_subsys_get(9)
• lpfc_sli_config_mbox_opcode_get(9)
• lpfc_sli4_mbx_read_fcf_rec(9)
• lpfc_request_features(9)
• lpfc_init_vfi(9)
• lpfc_reg_vfi(9)
• lpfc_init_vpi(9)
• lpfc_unreg_vfi(9)
• lpfc_sli4_dump_cfg_rg23(9)
• lpfc_reg_fcfi(9)
• lpfc_reg_fcfi_mrq(9)
• lpfc_unreg_fcfi(9)
• lpfc_resume_rpi(9)

iykyk 🧚

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and that's the page babe 💜 this little gem comes from ./drivers/scsi/lpfc, stamped October 2026 — go forth and read those service parameters, you absolute legend 👑✨🎀