STRUCT ISER_TX_DESC(9)

💅 struct iser_tx_desc(9)

okay bestie, welcome to the Kernel API Manual, and today's main character is struct iser_tx_desc — the iSER TX descriptor 🦋 (yes, that's the NAME section, and yes, it's giving "small struct, huge responsibilities").

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✨ SYNOPSIS ✨

here's the whole glow-up, every field exactly as written, no cap:

struct iser_tx_desc {
    struct iser_ctrl             iser_header;
    struct iscsi_hdr             iscsi_header;
    enum iser_desc_type        type;
    u64 dma_addr;
    struct ib_sge                tx_sg[2];
    int num_sge;
    struct ib_cqe                cqe;
    bool mapped;
    struct ib_reg_wr             reg_wr;
    struct ib_send_wr            send_wr;
    struct ib_send_wr            inv_wr;
};

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🎀 Members 🎀

like, let's go field by field, bestie, because every single one of these is doing something:

• iser_header — the iser header 💖
• iscsi_header — the iscsi header 🫶
• type — command/control/dataout
• dma_addr — the header buffer's dma_address 📍
• tx_sg — the scatter-gather situation: sg[0] points to the iser/iscsi headers, and sg[1] optionally points to either of: immediate data, unsolicited data-out, or control 🌈
• num_sge — how many sges are actually used on this TX task 🔢
• cqe — the completion handler ⭐
• mapped — is the task header mapped? (yes/no vibe check) 🙈
• reg_wr — registration WR
• send_wr — send WR
• inv_wr — invalidate WR

like, reg WR, send WR, inv WR — three whole work requests just vibing in one struct. iconic. 👑

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🦋 SEE ALSO 🦋

the whole friend group, iykyk — first up, the kernel file itself: ./drivers/infiniband/ulp/iser/iscsi_iser.h, then all these besties:

• struct iser_data_buf(9)
• struct iser_mem_reg(9)
• struct iser_rx_desc(9)
• struct iser_login_desc(9)
• struct iser_device(9)
• struct iser_reg_resources(9)
• struct iser_fr_desc(9)
• struct iser_fr_pool(9)
• struct ib_conn(9)
• struct iser_conn(9)
• struct iscsi_iser_task(9)
• struct iser_global(9)

go read them fr fr, they all ate 💅✨

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ngl this page is short but she eats every time. no warnings, no deprecated nonsense, just a clean little descriptor struct doing her thing 💜

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and that's the whole page, bestie 🍓 — brought to you by the source in ./drivers/infiniband/ulp/iser, dated October 2026, and the man page for struct iser_tx_desc(9) is officially wrapped. periodt 🧚‍♀️💖