STRUCT EF4_MSI_CONTEXT(9)

💅 struct ef4_msi_context(9) — ok bestie, let's talk MSI context

So this is a page from the Kernel API Manual, and it's about struct ef4_msi_context — literally the context for each MSI. Yes, each one gets its own. Iconic behavior honestly. 🎀

---

✨ SYNOPSIS ✨

The whole vibe, verbatim, no cap:

struct ef4_msi_context {
    struct ef4_nic *efx;
    unsigned int index;
    char name[IFNAMSIZ + 6];
 };

---

🌸 Members 🌸

Okay so these are the three fields and what each one is doing:

• efx — the associated NIC. Your whole network interface card, right there in the struct. Main character energy. 👑
• index — index of the channel/IRQ. It's giving "which one am I" and honestly same.
• name — name of the channel/IRQ. She has a name and she's not afraid to use it. 💖 (It's a char[IFNAMSIZ + 6], bestie, exactly as written.)

---

🦋 Description 🦋

Okay this is the actual tea, and it's important: unlike struct ef4_channel, this thing is never reallocated and it is always safe for the IRQ handler to access. Like, always. That's the whole point. No reallocation jumpscare, no "wait which pointer is valid" moment mid-interrupt. 🫶

ngl that "never reallocated" bit is the flex. Do not sleep on it. 💅

---

🌈 SEE ALSO 🌈

Go read these too, iykyk — they're all in the same kernel file ./drivers/net/ethernet/sfc/falcon/net_driver.h:

• struct ef4_buffer(9)
• struct ef4_special_buffer(9)
• struct ef4_tx_buffer(9)
• struct ef4_tx_queue(9)
• struct ef4_rx_buffer(9)
• struct ef4_rx_page_state(9)
• struct ef4_rx_queue(9)
• struct ef4_channel(9)
• struct ef4_channel_type(9)
• struct ef4_link_state(9)
• struct ef4_phy_operations(9)
• enum ef4_phy_mode(9)
• struct ef4_hw_stat_desc(9)
• struct ef4_nic(9)
• struct ef4_nic_type(9)

---

That's the whole page, bestie — slay. 💀✨

Sign-off time 🎀: this one lives under ./drivers/net/ethernet/sfc/falcon, dated October 2026, and yes the title is still struct ef4_msi_context(9) — periodt. 🦋💜