update_buffer_lossy(9)

🫶 update_buffer_lossy(9) 🫶

okay so welcome to the Kernel API Manual, bestie — this page is literally all about update_buffer_lossy(9), and it's giving "tiny function, very specific job" energy ✨

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🌸 NAME 🌸

update_buffer_lossy — Update buffer configuration based on pfc 💅

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🎀 SYNOPSIS 🎀

int update_buffer_lossy (struct mlx5_core_dev *mdev , unsigned int
       max_mtu , u8 pfc_en , u8 *buffer , u32 xoff , u16 port_buff_cell_sz ,
       struct mlx5e_port_buffer *port_buffer , bool *change );

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🦋 ARGUMENTS 🦋

• mdev — port function core device 👑
• max_mtu — netdev's max_mtu
• pfc_en — <input> current pfc configuration
• buffer — <input> current prio to buffer mapping
• xoff — <input> xoff value
• port_buff_cell_sz — <input> port buffer cell_size
• port_buffer — <output> port receive buffer configuration
• change — <output>

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💖 DESCRIPTION 💖

So this function updates the buffer configuration based on the pfc configuration and the priority to buffer mapping — no cap, that's the whole vibe 🫶

The buffer's lossy bit gets changed like this:

• it goes lossless if there's at least one PFC enabled priority mapped to this buffer 🌈
• it goes lossy if all priorities mapped to this buffer are PFC disabled 💀

That's it. That's the lore. ✨

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⭐ RETURN ⭐

Returns 0 if no error, and sets change to true if the buffer configuration was modified. periodt 💅

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/net/ethernet/mellanox/mlx5/core/en/port_buffer.c
• select_sbcm_params(9)

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and that's the page, bestie 🎀 this cutie came from the Kernel API Manual, source/version ./drivers/net/ethernet/mellano..., dated October 2026, and yes — it's still update_buffer_lossy(9) at the end, iconic behavior only 👑💜