mlx4_SET_VPORT_QOS_set(9)

✨ mlx4_SET_VPORT_QOS_set(9) ✨

okay bestie, welcome to the Kernel API Manual 💅 this one's short but she's important — it's giving "small function, big responsibilities" energy, fr fr.

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🌸 NAME 🌸

mlx4_SET_VPORT_QOS_set — sets the QoS properties of a Vport, periodt. 🎀

So here's the tea: the QoS parameters can be modified at any time, which is lowkey iconic and flexible of them. BUT — and this is the important part, don't skip it — they must be initialized before any QP is associated with the VPort. Like, before. No exceptions. Timing is everything bestie, iykyk 😭

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🦋 SYNOPSIS 🦋

int mlx4_SET_VPORT_QOS_set (struct mlx4_dev *dev , u8 port , u8 vport ,
       struct mlx4_vport_qos_param *in_param );

Four args, one return value, zero drama. Slay. ✨

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💖 ARGUMENTS 💖

• dev — the mlx4_dev. your device of the moment, the main character 👑
• port — the physical port number. yes, physical. like, the actual hardware one 🌈
• vport — the Vport id. which virtual port are we setting up, bestie? 🧚
• in_param — an array of mlx4_vport_qos_param which holds the requested values. that's right, an array — it's carrying all your QoS wishes in one little bundle 🫶

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🔥 DESCRIPTION 🔥

Returns 0 on success, or a negative mlx4_core errno code. no cap, that's the whole description — she's brief but she's giving substance 💀

real talk though: check that return value. a negative errno is the function telling you something went sideways 🙈

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/net/ethernet/mellanox/mlx4/fw_qos.h — go read it, i promise it's worth it 📖
• mlx4_SET_PORT_PRIO2TC(9)
• mlx4_SET_PORT_SCHEDULER(9)
• mlx4_ALLOCATE_VPP_get(9)
• mlx4_ALLOCATE_VPP_set(9)
• mlx4_SET_VPORT_QOS_get(9) — the getter to this setter, they're literally a matched set 🎀

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and that's the whole page, babe 💜 stay hydrated, read your errno codes, and remember to init your QoS params before the QP shows up, ok bye!! 🌸🦋✨

./drivers/net/ethernet/mellano... — October 2026 — mlx4_SET_VPORT_QOS_set(9)