STRUCT RIO_MPORT(9)

🎀 struct rio_mport(9) 🎀

Hey bestie!! Okay so welcome to the Kernel API Manual — yes, that manual — and today's main character is struct rio_mport, which is literally the RIO master port info struct. She's a big one, she's got range, and we're gonna go through every single field together because I refuse to let you skip any of them 💅

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✨ NAME ✨

struct rio_mport — RIO master port info. That's it, that's the vibe. It's the master port's whole little info package 🌸

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🦋 SYNOPSIS 🦋

Bestie, here's the shape of her. Every single line, exactly as it lives in the header. No editorials in here, just vibes:

struct rio_mport {
    struct list_head dbells;
    struct list_head pwrites;
    struct list_head node;
    struct list_head nnode;
    struct rio_net *net;
    struct mutex lock;
    struct resource iores;
    struct resource riores[RIO_MAX_MPORT_RESOURCES];
    struct rio_msg inb_msg[RIO_MAX_MBOX];
    struct rio_msg outb_msg[RIO_MAX_MBOX];
    int host_deviceid;
    struct rio_ops *ops;
    unsigned char id;
    unsigned char index;
    unsigned int sys_size;
    u32 phys_efptr;
    u32 phys_rmap;
    unsigned char name[RIO_MAX_MPORT_NAME];
    struct device dev;
    void *priv;
  #ifdef CONFIG_RAPIDIO_DMA_ENGINE;
    struct dma_device       dma;
  #endif;
    struct rio_scan *nscan;
    atomic_t state;
    unsigned int pwe_refcnt;
 };

💀 Quick head's up: that dma field only shows up when CONFIG_RAPIDIO_DMA_ENGINE; is defined. So if you're not seeing her, that's why, no cap.

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💖 Members 💖

Okay now the fun part — the full member-by-member breakdown. Grab a snack 🍓

• dbells — List of doorbell events 🛎️
• pwrites — List of portwrite events ✍️
• node — Her node in the global list of master ports 🌍
• nnode — Her node in the network list of master ports 🌐
• net — The RIO net this mport is attached to 🫶
• lock — The lock that synchronizes list manipulations 🔒 (respect the lock, fr fr)
• iores — I/O mem resource that this master port interface owns 📦
• riores — The RIO resources that this master port interface owns 🧺
• inb_msg — RIO inbound message event descriptors 📥
• outb_msg — RIO outbound message event descriptors 📤
• host_deviceid — Host device ID associated with this master port 🪪
• ops — configuration space functions ⚙️
• id — Port ID, unique among all ports 👑
• index — Port index, unique among all port interfaces of the same type 🔢
• sys_size — RapidIO common transport system size 📏
• phys_efptr — RIO port extended features pointer 🧭
• phys_rmap — LP-Serial EFB Register Mapping type (1 or 2). 🗺️
• name — Port name string 🏷️
• dev — device structure associated with an mport 💻
• priv — Master port private data 🙈
• dma — DMA device associated with mport 🌀
• nscan — RapidIO network enumeration/discovery operations 🔍
• state — mport device state 🚦
• pwe_refcnt — port-write enable ref counter, there to track enable/disable requests 🧮

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🌈 SEE ALSO 🌈

Sister structs and friends, all living in the kernel file ./include/linux/rio.h:

• struct rio_switch(9)
• struct rio_switch_ops(9)
• struct rio_dev(9)
• struct rio_msg(9)
• struct rio_dbell(9)
• struct rio_net(9)
• struct rio_mport_attr(9)
• struct rio_ops(9)
• struct rio_driver(9)
• struct rio_scan(9)
• struct rio_scan_node(9)

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And that's the whole page, bestie!! ✨ Signing off from ./include/linux, dated October 2026 — stay slay, stay documented, and remember: every field matters 💜🦋🎀