qed_mcp_cmd(9)

📦 version 7.3.1, in nixpkgs unstable

💅 qed_mcp_cmd — sleepable MCP mailbox command sender (from the Kernel API Manual, qed_mcp_cmd(9))

okay so bestie, gather round, because this one is literally the little function that could: qed_mcp_cmd is a sleepable function for sending commands to the MCP mailbox. Like, the whole operation — from the moment you send the request until the MCP answers back — is wrapped in a mutex lock. One command at a time, no cutting in line, we are classy here 💅

The wait for that MCP response gets checked every 10ms, up to 5 seconds total. So yes, she waits. patiently. with a timer. ⏰

🚨 and this is the big one: should not be called from atomic context. fr fr, don't do it. She sleeps, atomic context does not. that's a whole disaster waiting to happen 😭

✨ SYNOPSIS ✨

int qed_mcp_cmd (struct qed_hwfn *p_hwfn , struct qed_ptt *p_ptt , u32
cmd , u32 param , u32 *o_mcp_resp , u32 *o_mcp_param );

like, six args, one int, endless vibes 🌸

🎀 ARGUMENTS 🎀

  • p_hwfn — the HW device data. the main character of the hardware world 👑
  • p_ptt — the PTT you need for register access. no PTT, no entry, iykyk 🦋
  • cmd — the command being sent to the MCP. the actual message, the whole point 🫶
  • param — optional param. optional! she doesn't have to show up ✨
  • o_mcp_resp — the MCP response code (exclude sequence). this is where the answer lands 💖
  • o_mcp_param — optional parameter provided by the MCP response. MCP said "here, you might want this too" 🙈

🔥 RETURN 🔥

Int — and:

  • 0 — operation was successul. (that's their spelling, not mine, bestie 💀 but yes, zero equals slay)

👑 SEE ALSO 👑

bestie. bestie. sit down. the friend group is massive and every single one of them is here 💜

First up, the kernel file herself:

  • ./drivers/net/ethernet/qlogic/qed/qed_mcp.h

and now the full roster, no cap, nobody gets left out:

like. seventy-something siblings. one big happy qed family 🌈

and that's the page, bestie ✨ this came to you straight out of ./drivers/net/ethernet/qlogic/qed, dated October 2026, and you know she's still rocking the qed_mcp_cmd(9) title. go forth, send commands, do NOT do it in atomic context. mwah 💖

📦 where this page comes from