mpi3mr_expa..._sas_address(9)

💅 mpi3mr_expander_find_by_sas_address(9) — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual, and today's main character is mpi3mr_expander_find_by_sas_address — the little function that goes snooping through the mpi3mr driver looking for a specific SAS expander. it's giving "where's my friend" energy but for hardware 🔍💖

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🌸 NAME 🌸

mpi3mr_expander_find_by_sas_address — literally the SAS expander search, no cap 🦋

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✨ SYNOPSIS ✨

struct mpi3mr_sas_node * mpi3mr_expander_find_by_sas_address (struct
mpi3mr_ioc *mrioc , u64 sas_address , struct mpi3mr_hba_port *hba_port
);

like, it hands you back a pointer to a struct mpi3mr_sas_node, or nothing at all. those are the only two moods 💅

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🎀 ARGUMENTS 🎀

• mrioc — the adapter instance reference. it's the controller you're working with, your main connection to the whole mpi3mr situation 🫶
• sas_address — the SAS address of the expander you're hunting for. a u64, so it's a big ol' number, and it's the one thing that actually identifies your target 🔥
• hba_port — the HBA port entry. the port context that goes along with the search 🌈

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⭐ RETURN ⭐

a valid SAS expander node... or NULL. that's it. found it, or didn't. iconic binary behaviour honestly 💀

ngl bestie, always check for NULL before you go dereferencing. the function is literally telling you it might come back empty-handed 🙈

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🦋 SEE ALSO 🦋

the kernel file this lives in: ./drivers/scsi/mpi3mr/mpi3mr_transport.c — that's the whole neighborhood, go say hi 👋

and now the full friend group, everybody in the mpi3mr transport clique:

• mpi3mr_post_transport_req(9)
• mpi3mr_report_manufacture(9)
• __mpi3mr_expander_find_by_handle(9)
• mpi3mr_is_expander_device(9)
• mpi3mr_get_sas_address(9)
• __mpi3mr_get_tgtdev_by_addr(9)
• mpi3mr_get_tgtdev_by_addr(9)
• mpi3mr_remove_device_by_sas_address(9)
• __mpi3mr_get_tgtdev_by_addr_and_rphy(9)
• __mpi3mr_sas_node_find_by_sas_address(9)
• mpi3mr_parent_present(9)
• mpi3mr_convert_phy_link_rate(9)
• mpi3mr_delete_sas_phy(9)
• mpi3mr_add_sas_phy(9)
• mpi3mr_add_phy_to_an_existing_port(9)
• mpi3mr_delete_sas_port(9)
• mpi3mr_del_phy_from_an_existing_port(9)
• mpi3mr_sas_port_sanity_check(9)
• mpi3mr_set_identify(9)
• mpi3mr_add_host_phy(9)
• mpi3mr_add_expander_phy(9)
• mpi3mr_alloc_hba_port(9)
• mpi3mr_get_hba_port_by_id(9)
• mpi3mr_update_links(9)
• mpi3mr_sas_host_refresh(9)
• mpi3mr_sas_host_add(9)
• mpi3mr_sas_port_add(9)
• mpi3mr_sas_port_remove(9)
• struct host_port(9)
• mpi3mr_update_mr_sas_port(9)
• mpi3mr_refresh_sas_ports(9)
• mpi3mr_refresh_expanders(9)
• mpi3mr_expander_node_add(9)
• mpi3mr_expander_add(9)
• mpi3mr_expander_node_remove(9)
• mpi3mr_expander_remove(9)
• mpi3mr_get_sas_negotiated_logical_linkrate(9)
• mpi3mr_report_tgtdev_to_sas_transport(9)
• mpi3mr_remove_tgtdev_from_sas_transport(9)
• mpi3mr_get_port_id_by_sas_phy(9)
• mpi3mr_get_port_id_by_rphy(9)
• mpi3mr_get_expander_phy_error_log(9)
• mpi3mr_transport_get_linkerrors(9)
• mpi3mr_transport_get_enclosure_identifier(9)
• mpi3mr_transport_get_bay_identifier(9)
• mpi3mr_expander_phy_control(9)
• mpi3mr_transport_phy_reset(9)
• mpi3mr_transport_phy_enable(9)
• mpi3mr_transport_phy_speed(9)
• mpi3mr_map_smp_buffer(9)
• mpi3mr_unmap_smp_buffer(9)
• mpi3mr_transport_smp_handler(9)

like, that's the whole squad, lowkey obsessed with how many of them there are 🧚💜

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and that's the page!! mwah 💋 this one shipped from ./drivers/scsi/mpi3mr back in October 2026 — dated and sourced, slay, periodt 🎀✨💖