STRUCT NFP_APP_TYPE(9)

💖 NAME 💖

so like, struct nfp_app_type — bestie, it's literally the application definition ✨ that's the whole vibe, iykyk

quick heads-up, this page lives in the Kernel API Manual (section 9, fancy), so you know it's the real deal 👑

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✨ SYNOPSIS ✨

okay so here's the full shape of it, no cap, every field exactly as it is:

struct nfp_app_type {
    enum nfp_app_id id;
    const char *name;
    u32 ctrl_cap_mask;
    bool ctrl_has_meta;
    int (*init)(struct nfp_app *app);
    void (*clean)(struct nfp_app *app);
    const char *(*extra_cap)(struct nfp_app *app, struct nfp_net *nn);
    int (*ndo_init)(struct nfp_app *app, struct net_device *netdev);
    void (*ndo_uninit)(struct nfp_app *app, struct net_device *netdev);
    int (*vnic_alloc)(struct nfp_app *app, struct nfp_net *nn, unsigned
int id);
    void (*vnic_free)(struct nfp_app *app, struct nfp_net *nn);
    int (*vnic_init)(struct nfp_app *app, struct nfp_net *nn);
    void (*vnic_clean)(struct nfp_app *app, struct nfp_net *nn);
    int (*repr_init)(struct nfp_app *app, struct net_device *netdev);
    void (*repr_preclean)(struct nfp_app *app, struct net_device
*netdev);
    void (*repr_clean)(struct nfp_app *app, struct net_device *netdev);
    int (*repr_open)(struct nfp_app *app, struct nfp_repr *repr);
    int (*repr_stop)(struct nfp_app *app, struct nfp_repr *repr);
    int (*check_mtu)(struct nfp_app *app, struct net_device *netdev, int
new_mtu);
    int (*repr_change_mtu)(struct nfp_app *app, struct net_device
*netdev, int new_mtu);
    u64 *(*port_get_stats)(struct nfp_app *app, struct nfp_port *port,
u64 *data);
    int (*port_get_stats_count)(struct nfp_app *app, struct nfp_port
*port);
    u8 *(*port_get_stats_strings)(struct nfp_app *app, struct nfp_port
*port, u8 *data);
    int (*start)(struct nfp_app *app);
    void (*stop)(struct nfp_app *app);
    int (*netdev_event)(struct nfp_app *app, struct net_device *netdev,
unsigned long event, void *ptr);
    void (*ctrl_msg_rx)(struct nfp_app *app, struct sk_buff *skb);
    void (*ctrl_msg_rx_raw)(struct nfp_app *app, const void *data,
unsigned int len);
    int (*setup_tc)(struct nfp_app *app, struct net_device *netdev, enum
tc_setup_type type, void *type_data);
    int (*bpf)(struct nfp_app *app, struct nfp_net *nn, struct
netdev_bpf *xdp);
    int (*xdp_offload)(struct nfp_app *app, struct nfp_net *nn, struct
bpf_prog *prog, struct netlink_ext_ack *extack);
    int (*sriov_enable)(struct nfp_app *app, int num_vfs);
    void (*sriov_disable)(struct nfp_app *app);
    enum devlink_eswitch_mode (*eswitch_mode_get)(struct nfp_app *app);
    int (*eswitch_mode_set)(struct nfp_app *app, u16 mode);
    struct net_device *(*dev_get)(struct nfp_app *app, u32 id, bool
*redir_egress);
 };

like, it's giving "big struct, big responsibilities" 💅 but honestly every single member is doing something and we're gonna go through all of them 🫶

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🎀 MEMBERS 🎀

okay so, member by member, let's get into it — grab a snack 🍓

• id — the application ID, like its little passport 🌸
• name — the application name, its government name basically ✨
• ctrl_cap_mask — the ctrl vNIC capability mask. this one's lowkey iconic: it lets you disable features like IRQMOD — things that are on by default but honestly counter-productive for control messages, which are often latency-sensitive 😭 like yes queen, turn that off
• ctrl_has_meta — control messages have a prepend of type:5/port:CTRL 🎀
• init — does the basic app checks and init ✅
• clean — cleans up the app state 🧹✨
• extra_cap — extra capabilities string, lil bonus content 💖
• ndo_init — vNIC and repr netdev .ndo_init, two for the price of one 👑
• ndo_uninit — vNIC and repr netdev .ndo_unint 🦋 (yes that's spelled .ndo_unint in the original, we don't gatekeep, we reproduce faithfully 🙈)
• vnic_alloc — allocate vNICs (assign port types, etc.) — the "assigning port types" part is doing so much work fr fr
• vnic_free — free up the app's vNIC state 🫶
• vnic_init — vNIC netdev was registered ⭐
• vnic_clean — vNIC netdev is about to be unregistered 💀
• repr_init — representor about to be registered 🌈
• repr_preclean — representor about to unregistered, and it runs before the app's reference to it is removed — order matters bestie, timing is everything 💅
• repr_clean — representor about to be unregistered 🎀
• repr_open — representor netdev open callback 🔥
• repr_stop — representor netdev stop callback ✋
• check_mtu — MTU change request on a netdev (verify it is valid) — verify only, we're just checking 🔍
• repr_change_mtu — MTU change request on repr (make and verify the change) — this one actually does the thing 😤
• port_get_stats — get extra ethtool statistics for a port 📊
• port_get_stats_count — get the count of those extra statistics for a port 🔢
• port_get_stats_strings — get the strings for the extra statistics 🔤
• start — start application logic 🚀
• stop — stop application logic 🛑
• netdev_event — Netdevice notifier event 👀
• ctrl_msg_rx — control message handler 📨
• ctrl_msg_rx_raw — handler for control messages from data queues 🌀
• setup_tc — setup TC ndo ⚙️
• bpf — BPF ndo offload-related calls 🧚
• xdp_offload — offload an XDP program 🚀✨
• sriov_enable — app-specific sriov initialisation 🎬
• sriov_disable — app-specific sriov clean-up 🧼
• eswitch_mode_get — get SR-IOV eswitch mode 🔎
• eswitch_mode_set — set SR-IOV eswitch mode 🎛️
• dev_get — get representor or internal port representing netdev 🪞 (it's giving mirrorball)

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🦋 DESCRIPTION 🦋

Callbacks. that's it, that's the description 💀 — it's a struct made of callbacks, and honestly that's the whole personality. every member up there is a little hook waiting for its moment, main character energy one callback at a time 👑

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/ethernet/netronome/nfp/nfp_app.h
• struct nfp_app(9)

like go read the header and then go read struct nfp_app(9), they're literally siblings, you can't know one without the other 💜

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okay so that's the whole page!! mwah 💋

tiny sign-off moment: this came from ./drivers/net/ethernet/netrono... and it's dated October 2026, and the page itself is called struct nfp_app_type(9) — go off, kernel docs, we love to see it 💖✨🎀