STRUCT NFP_MTU_CONF(9)

💅 struct nfp_mtu_conf(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this one's a struct page, manual section 9, and it's literally all about managing the MTU setting. yes, that MTU. the big one. no cap 🎀

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✨ NAME ✨

struct nfp_mtu_conf — manage MTU setting 🫶

like the whole entire job of this struct is keeping track of an MTU change request and whether it got acked. that's it. that's the vibe check. 💅

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🌸 SYNOPSIS 🌸

struct nfp_mtu_conf {
    u32 portnum;
    unsigned int requested_val;
    bool ack;
    wait_queue_head_t wait_q;
    spinlock_t lock;
 };

look at her. five fields. absolutely iconic layout, no notes 😭✨

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🦋 Members 🦋

okay so let's meet the cast, one field at a time 👑

• portnum — this is a u32, and it's the NFP port number of the repr that's got the requested MTU change. like, which port are we even talking about? this one. 💖
• requested_val — an unsigned int, and it's literally the MTU value requested for that repr. the number you asked for. the dream. the goal. 🎯
• ack — a bool, and it flips when you've received an ack that the MTU has been correctly set</fimint>. so like, confirmation. the "yes bestie it's done" flag. ✅ (not me spelling it ack and thinking about the noise you make when you see a bug — anyway 🐛)
• wait_q — a wait_queue_head_t and it's the wait queue for MTU acknowledgements. everyone just chilling in line waiting for their ack to show up. very main character queue energy ngl 💜
• lock — a spinlock_t, and it's the lock for setting/reading MTU variables. because we do not rawdog shared state in this house, periodt. 🔒

lowkey important: that lock is there for a reason — setting and reading these MTU variables is the exact thing it's guarding. don't be out here reading requested_val without it, iykyk 🙈

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🔥 SEE ALSO 🔥

so this struct lives in the kernel file ./drivers/net/ethernet/netronome/nfp/flower/main.h — that's where you'll find her, fr fr 📁✨

and she's in extremely good company, because you also gotta check out:

• struct nfp_fl_tunnel_offloads(9)
• struct nfp_tun_neigh_lag(9)
• struct nfp_tun_neigh(9)
• struct nfp_tun_neigh_ext(9)
• struct nfp_tun_neigh_v4(9)
• struct nfp_tun_neigh_v6(9)
• struct nfp_neigh_entry(9)
• struct nfp_predt_entry(9)
• struct nfp_fl_lag(9)
• struct nfp_fl_internal_ports(9)
• struct nfp_flower_priv(9)
• struct nfp_fl_qos(9)
• struct nfp_flower_repr_priv(9)
• struct nfp_flower_non_repr_priv(9)
• struct nfp_ipv6_addr_entry(9)

like that's a whole friend group right there, the flower squad 🌸🦋 go read all of them, bestie, they're all connected 💖

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and that's the whole page!! this one shipped out of ./drivers/net/ethernet/netrono... back in October 2026, and it's filed under struct nfp_mtu_conf(9) in section 9 of the manual 🎀 mwah, go set some MTUs responsibly 💋✨🫶