STRUCT NFP_DP_OPS(9)

🦋 struct nfp_dp_ops(9) — from the Kernel API Manual, bestie 💅

okay so picture this: you're deep in the kernel, you've got multiple different implementations of "dp" doing their thing, and somebody has to wrap them all up in one tidy little struct. That's struct nfp_dp_ops. It's literally the hook-collection energy we all deserve. ✨

🌸 NAME 🌸

struct nfp_dp_ops — hooks that wrap around the different implementations of different dp. no cap, that's the whole job. 🫶

✨ SYNOPSIS ✨

like, here's the whole vibe, verbatim:

struct nfp_dp_ops {
    enum nfp_nfd_version version;
    unsigned int tx_min_desc_per_pkt;
    u32 cap_mask;
    u64 dma_mask;
    int (*poll)(struct napi_struct *napi, int budget);
    int (*xsk_poll)(struct napi_struct *napi, int budget);
    void (*ctrl_poll)(struct tasklet_struct *t);
    netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *netdev);
    bool (*ctrl_tx_one)(struct nfp_net *nn, struct nfp_net_r_vector
*r_vec, struct sk_buff *skb, bool old);
    void (*rx_ring_fill_freelist)(struct nfp_net_dp *dp, struct
nfp_net_rx_ring *rx_ring);
    int (*tx_ring_alloc)(struct nfp_net_dp *dp, struct nfp_net_tx_ring
*tx_ring);
    void (*tx_ring_reset)(struct nfp_net_dp *dp, struct nfp_net_tx_ring
*tx_ring);
    void (*tx_ring_free)(struct nfp_net_tx_ring *tx_ring);
    int (*tx_ring_bufs_alloc)(struct nfp_net_dp *dp, struct
nfp_net_tx_ring *tx_ring);
    void (*tx_ring_bufs_free)(struct nfp_net_dp *dp, struct
nfp_net_tx_ring *tx_ring);
    void (*print_tx_descs)(struct seq_file *file, struct
nfp_net_r_vector *r_vec, struct nfp_net_tx_ring *tx_ring, u32 d_rd_p,
u32 d_wr_p);
 };

🎀 Members 🎀

bestie, let's meet the whole cast. every single one of them, nobody gets left out 👑

• version — tells you what dp type this is. it's giving name tag at the party 🏷️
• tx_min_desc_per_pkt — the minimal TX descs you need for each packet. don't skimp, it's the bare minimum fr fr
• cap_mask — the mask of supported features 💫
• dma_mask — DMA addressing capability. the range of addresses it can handle, iconic
• poll — the napi poll for the normal rx/tx path
• xsk_poll — the napi poll you get when xsk is enabled (special occasion poll ✨)
• ctrl_poll — tasklet poll for the ctrl rx/tx path
• xmit — xmit for the normal path, sending it 🚀
• ctrl_tx_one — xmit for the ctrl path. one at a time, main character energy
• rx_ring_fill_freelist — gives buffers from the ring to FW. sharing is caring 🫶
• tx_ring_alloc — allocate resources for a TX ring
• tx_ring_reset — frees any untransmitted buffers and resets pointers. note the "any untransmitted buffers" part — that's a real consequence, not just a vibe check ⚠️
• tx_ring_free — frees the resources that were allocated to a TX ring
• tx_ring_bufs_alloc — allocate resources for each TX buffer
• tx_ring_bufs_free — free the resources allocated to each TX buffer
• print_tx_descs — shows the TX ring's info, for debug purposes. detective mode 🔍

🌈 SEE ALSO 🌈

• the kernel file ./drivers/net/ethernet/netronome/nfp/nfp_net_dp.h — go read it, iykyk 📖
• nfp_net_tx_full(9)
• nfp_net_irq_unmask(9)

okay that's the whole page, you ate that 💅 go forth and wrap your dps. and for the record, this whole thing came out of ./drivers/net/ethernet/netrono... in October 2026 — that's the version/date stamp of the page itself, so jot that down in your notes babe 🍓💖