STRUCT MLX5_FPGA_CONN_ATTR(9)

💅 struct mlx5_fpga_conn_attr(9) — the Kernel API Manual glow-up

okay so bestie, you're looking at struct mlx5_fpga_conn_attr — the FPGA connection attributes struct ✨ It literally just describes the attributes of a connection. that's the whole vibe. it's giving "settings page for your FPGA connection" 🎀

🌸 NAME 🌸

struct mlx5_fpga_conn_attr — FPGA connection attributes. Describes the attributes of a connection. that's it, that's the girl 💅

✨ SYNOPSIS ✨

struct mlx5_fpga_conn_attr {
    unsigned int tx_size;
    unsigned int rx_size;
    void (*recv_cb)(void *cb_arg, struct mlx5_fpga_dma_buf *buf);
    void *cb_arg;
 };

🦋 Members 🦋 (the actual cast of characters)

• tx_size — size of the connection TX queue, measured in packets 📤 like, how many packets your transmit queue can hold. iconic.
• rx_size — size of the connection RX queue, measured in packets 📥 same energy, receive side.
• recv_cb — the callback function that gets called for received packets 🔔 yeah she's the one doing the work when stuff arrives:
  • cb_arg: the value you provided in mlx5_fpga_conn_attr.cb_arg
  • buf: a buffer containing a received packet

💀 important caveat bestie: buf is guaranteed to only contain a single scatter-gather entry. The size of the actual packet received is specified in buf.sg[0].size. And when this callback returns, the packet buffer may be re-used for subsequent receives — so don't go holding onto it like it's yours forever, it is NOT 😭

• cb_arg — a context to be passed to the recv_cb callback 🫶 your little grab-bag of whatever you want handed back to you.

👑 SEE ALSO 👑

• Kernel file ./drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.h
• Innova SDK(9)
• enum mlx5_fpga_access_type(9)
• struct mlx5_fpga_dma_entry(9)
• struct mlx5_fpga_dma_buf(9)
• mlx5_fpga_sbu_conn_create(9)
• mlx5_fpga_sbu_conn_destroy(9)
• mlx5_fpga_sbu_conn_sendmsg(9)
• mlx5_fpga_mem_read(9)
• mlx5_fpga_mem_write(9)
• mlx5_fpga_get_sbu_caps(9)

and that's the whole page, no cap 🌈 this one lives over at ./drivers/net/ethernet/mellano... (yes the original really does cut off like that, I don't make the rules 🙈) and it's dated October 2026, filed under struct mlx5_fpga_conn_attr(9). mwah, go read your kernel headers bestie 💖🎀🧚