STRUCT CHAIN_ELEMENT(9)

💖 struct chain_element(9) 💖

okay so bestie, we're in the Kernel API Manual today and the star of the show is struct chain_element(9) — no cap, it's lowkey one of the most iconic little helpers in the whole mpi3mr saga 🫶

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✨ NAME ✨

struct chain_element — it's a memory descriptor structure, and its whole job is to store virtual and dma addresses for chain elements 💅 like that's literally it, that's the gig, and it does it beautifully.

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🌸 SYNOPSIS 🌸

struct chain_element {
    void *addr;
    dma_addr_t dma_addr;
 };

look at her. two members. clean lines. main character energy ✨

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🎀 Members 🎀

• addr — the virtual address 💜
• dma_addr — the dma address 🦋

yep, one of each, no notes, she ate 🔥

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🌈 SEE ALSO 🌈

Kernel file ./drivers/scsi/mpi3mr/mpi3mr.h plus the whole friend group — seriously, this struct rolls deep:

• struct mpi3mr_nvme_pt_sge(9)
• struct mpi3mr_buf_map(9)
• struct mpi3mr_compimg_ver(9)
• struct segments(9)
• struct op_req_qinfo(9)
• struct op_reply_qinfo(9)
• struct mpi3mr_intr_info(9)
• struct mpi3mr_throttle_group_info(9)
• struct mpi3mr_hba_port(9)
• struct mpi3mr_sas_port(9)
• struct mpi3mr_sas_phy(9)
• struct mpi3mr_sas_node(9)
• struct mpi3mr_enclosure_node(9)
• struct tgt_dev_sas_sata(9)
• struct tgt_dev_pcie(9)
• struct tgt_dev_vd(9)
• union _form_spec_inf(9)
• struct mpi3mr_tgt_dev(9)
• mpi3mr_tgtdev_get(9)
• mpi3mr_free_tgtdev(9)
• mpi3mr_tgtdev_put(9)
• struct mpi3mr_stgt_priv_data(9)
• struct mpi3mr_drv_cmd(9)
• union mpi3mr_trigger_data(9)
• struct trigger_event_data(9)
• struct diag_buffer_desc(9)
• struct dma_memory_desc(9)
• struct scmd_priv(9)
• struct mpi3mr_ioc(9)
• struct mpi3mr_fwevt(9)
• struct delayed_dev_rmhs_node(9)
• struct delayed_evt_ack_node(9)

like… the whole cast 😭 go read them, fr fr, iykyk 👑

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aaaand that's the page, bestie 💖 this one lives in ./drivers/scsi/mpi3mr and it's dated October 2026 — so jot that down, screenshot it, whatever you gotta do 📸 mwah, slay, bye 🧚‍♀️⭐