STRUCT ISER_RX_DESC(9)

💖 struct iser_rx_desc(9) — the iSER RX descriptor, explained 💖

okay bestie, welcome to the <pink>kernel api manual</pink> ✨ this one is literally the page for struct iser_rx_desc, which is the iSER RX descriptor 🎀 yes that's the NAME section, we're doing this properly.

✨ SYNOPSIS ✨

here's the whole vibe, copy-pasted straight from the source because we do not paraphrase code in this house 💅

struct iser_rx_desc {
    struct iser_ctrl             iser_header;
    struct iscsi_hdr             iscsi_header;
    char data[ISER_RECV_DATA_SEG_LEN];
    u64 dma_addr;
    struct ib_sge                rx_sg;
    struct ib_cqe                cqe;
    char pad[ISER_RX_PAD_SIZE];
 };

that's it. that's the struct. no cap, it's giving receive buffer main character energy 🦋

🫶 Members 🫶

like a group chat, every member pulls their weight:

• iser_header — the iser header 🌸 literally just the iser header, doing iser header things.
• iscsi_header — the iscsi header 💜 same deal, but iscsi flavored.
• data — the received data segment 🍓 this is where the actual payload lands, bestie. the good stuff.
• dma_addr — the receive buffer dma address ✨ the address of the receive buffer, dma-style. iykyk.
• rx_sg — ib_sge of receive buffer 🎀 the scatter/gather entry for the receive buffer.
• cqe — the completion handler 💫 it handles completions. iconic behavior honestly.
• pad — for sense data. and here's the note, straight up, no editing: TODO: Modify to maximum sense length supported 😭 yeah, it's a TODO. we love a work-in-progress king 👑 it's padding for sense data, and the TODO says to modify it to the maximum sense length supported.

ngl, that pad field is lowkey the most relatable member — just vibing there, waiting for someone to come fix it 🙈

🌈 SEE ALSO 🌈

go read these next, they're the friend group 🧚 and yes, the source file is right there too:

• Kernel file ./drivers/infiniband/ulp/iser/iscsi_iser.h
• struct iser_data_buf(9)
• struct iser_mem_reg(9)
• struct iser_tx_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)

okay that's the whole page, you ate it fr fr 💅 this masterpiece lives over in ./drivers/infiniband/ulp/iser, and it's stamped October 2026 — so yeah, see you in the future bestie, stay slay, drink water, read your kernel headers 🫶✨🎀