mlx5_ib_read...r_wqe_common(9)

💅 NAME 💅

mlx5_ib_read_user_wqe_common — bestie, this one copies a WQE (or honestly just part of one) from a user WQ into a kernel buffer ✨

So this page lives in the Kernel API Manual, and yes we're reading the whole thing together, no skimming 🫶

---

✨ SYNOPSIS ✨

int mlx5_ib_read_user_wqe_common (struct ib_umem *umem , void *buffer ,
size_t buflen , int wqe_index , int wq_offset , int wq_wqe_cnt , int
wq_wqe_shift , int bcnt , size_t *bytes_copied );

That's nine whole arguments, she's not doing a small function, she's doing a moment 👑

---

🎀 ARGUMENTS 🎀

• umem — the user space memory where the WQ actually lives, like her home address 💖
• buffer — the buffer we're copying to, the destination, the main character
• buflen — how long that buffer is, the vibe check on size
• wqe_index — which WQE you're copying from, its lil index
• wq_offset — the offset to the start of the WQ, so we know where the party begins
• wq_wqe_cnt — how many WQEs there are in the WQ, the whole count 🦋
• wq_wqe_shift — log2 of the WQE size, that's not a typo, it's literally log base 2 ✨
• bcnt — number of bytes to copy, no more no less
• bytes_copied — number of bytes to copy (return value), she reports back at the end 💅

---

🌸 DESCRIPTION 🌸

So what she does is copy from the start of the WQE either bcnt bytes or less. That's it, that's the whole thing 💀

Important, fr fr: this does not guarantee to copy the entire WQE. Like, she's trying her best but she is not promising you the whole WQE, so do not come for her if it's partial 🙈

---

⭐ RETURN ⭐

zero on success, or an error code if things went sideways. Zero is the slay outcome 🎀

---

🔥 SEE ALSO 🔥

Peep the kernel file itself for the lore, bestie:

• ./drivers/infiniband/hw/mlx5/qp.c

---

And that's a wrap, cuties 🌈 This iconic little number comes to you from ./drivers/infiniband/hw/mlx5, dated October 2026 — go read the source, iykyk, periodt 💜