RDMA_REG_MSGS(3)

💖 RDMA_REG_MSGS 💖

okay bestie, welcome to the Librdmacm Programmer's Manual ✨ this one's about rdma_reg_msgs, and it's literally the glow-up your message buffers need before they can go anywhere. sit down, hydrate, let's get into it 🫶

✨ NAME ✨

rdma_reg_msgs — register data buffer(s) for sending or receiving messages. yes queen, that's the whole job 💅

🌸 SYNOPSIS 🌸

#include <rdma/rdma_verbs.h>

struct ibv_mr * rdma_reg_msgs (struct rdma_cm_id *id, void *addr, size_t
length);

like. look at that signature. it's giving "i return a memory region and i need three things from you" 💜

🎀 ARGUMENTS 🎀

• id — a reference to a communication identifier where the message buffer(s) are gonna be used. your little context bestie 🪪
• addr — the address of the memory buffer(s) you're registering. where the data actually lives 📍
• length — the total length of the memory to register. all of it, no crumbs, no leftovers 📏

🦋 DESCRIPTION 🦋

so what this does: it registers an array of memory buffers — the ones you'll use for sending and receiving messages, or for RDMA operations. that's it, that's the vibe ✨

memory buffers registered with rdma_reg_msgs can be posted to an rdma_cm_id using rdma_post_send or rdma_post_recv, or they can be specified as the target of an RDMA read operation or the source of an RDMA write request. versatile icon behavior fr fr 👑

⭐ RETURN VALUE ⭐

on success you get a reference to the registered memory region back. on error you get NULL. 😭

and if an error happens, errno will be set to indicate the failure reason — so like, always check it, don't just assume. the error will tell you what went wrong if you actually listen 💀

🌈 NOTES 🌈

rdma_reg_msgs is what you use to register an array of data buffers that'll be used to send and/or receive messages on a queue pair associated with an rdma_cm_id. the memory buffer gets registered with the protection domain associated with the identifier. the start of the data buffer array is specified through the addr parameter, and the total size of the array is given by length. slay, consistent parameter usage, we love to see it 🧚

bestie, listen. all data buffers should be registered before being posted as a work request. no skipping ahead, no shortcuts. and users must deregister all registered memory by calling rdma_dereg_mr. that's not a suggestion, that's the rules. clean up after yourself, main character 💅

👑 SEE ALSO 👑

• rdma_cm(7)
• rdma_create_id(3)
• rdma_create_ep(3)
• rdma_reg_read(3)
• rdma_reg_write(3)
• ibv_reg_mr(3)
• ibv_dereg_mr(3)
• rdma_post_send(3)
• rdma_post_recv(3)
• rdma_post_read(3)
• rdma_post_readv(3)
• rdma_post_write(3)
• rdma_post_writev(3)

and that's the whole page, bestie 🫶 this came to you from librdmacm, dated 2010-07-19 — a certified classic, an elder icon, still relevant, still serving. go register those buffers. periodt. 💖✨🎀🦋🌸💅