ibv_query_port_speed(3)

✨ ibv_query_port_speed(3) ✨

okay so this is from the Libibverbs Programmer's Manual and honestly? it's giving "tiny function, big plot" 💅

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🌸 NAME 🌸

ibv_query_port_speed — bestie, this one queries an RDMA port's effective bandwidth in 100Mb/s granularity. yes, that's the whole job. queen of knowing exactly what she's about 👑

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🦋 SYNOPSIS 🦋

#include <infiniband/verbs.h>

int ibv_query_port_speed(struct ibv_context *context, uint32_t port_num, uint64_t *port_speed);

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💖 DESCRIPTION 💖

ibv_query_port_speed() — so what it does, right? It queries the device of the context at whatever port number you hand it, and it comes back with the effective bandwidth of that port in 100Mb/s granularity. That's it. That's the whole vibe check. no cap, it's that simple 🫶

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🎀 ARGUMENTS 🎀

• context — the device context, literally the main character here. everything happens through her ✨
• port_num — the device port number that needs to be queried. like, which port are we asking about, bestie? 👀
• port_speed — the effective bandwidth of the port for the device context, in a granularity of 100 Mb/s. this is where the answer lands 💌

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🔥 RETURN VALUE 🔥

ibv_query_port_speed() returns 0 on success, or the value of errno on failure — and that errno value tells you the failure reason. so if it's not 0, something went sideways and the number is literally the receipts 💀

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🧚 NOTES 🧚

ok so important caveat, do not skip this one:

the port_speed pointer value is valid only when the function returns 0. read it again. only then. fr fr 🙈

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👑 SEE ALSO 👑

• ibv_query_port(3)

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💜 AUTHOR 💜

• Patrisious Haddad phaddad@nvidia.com
• Or Har-Toov ohartoov@nvidia.com

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that's the whole page, and it ate, no crumbs left 🍓 so this lil icon came to you from libibverbs, dated 2025-10-19, and it's the ibv_query_port_speed(3) page. go forth and query responsibly, bestie 💅🌈