mlx5dv_get_data_direct_sysfs_path(3)

💅 mlx5dv_get_data_direct_sysfs_path(3) — the girlies' guide to finding your data direct device path

okay so bestie, this is a mlx5dv manpage, section 3 of the manual, and it's about one little function that tells you where your data direct device lives in sysfs. no cap, that's the whole vibe. let's get into it 🎀

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✨ SYNOPSIS ✨

#include <infiniband/mlx5dv.h>

int mlx5dv_get_data_direct_sysfs_path(struct ibv_context *context, char *buf,
                                      size_t buf_len)

that's the whole cast of characters right there 🫶

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🌸 DESCRIPTION 🌸

okay so picture this: you've got a context, right? and you wanna know if there's a data direct device attached to it, and if there is — which one. this function is literally the one that hands you the sysfs path of the data direct device that's associated with the given context. ✨

like, this is the moment where an application gets to discover whether a data direct device is even associated with the given context, and if so, which one it is. main character discovery energy, honestly. 🔥

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💖 ARGUMENTS 💖

• context — the RDMA device context you wanna work on. your starting point, your home base 🏠
• buf — the buffer where the sysfs path of the associated data direct device gets placed. this is where the magic lands ✨
• buf_len — the length of that buffer. keep it honest, bestie, because size matters here 😭

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👑 RETURN VALUE 👑

upon success, 0 is returned — slay. 💅 or, if things go sideways, you get the value of errno. and yes, that's errno, the classic "something went wrong and here's the drama" number. 🙈

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💀 ERRORS 💀

these are the specific error values you should genuinely be considering, fr fr:

• ENODEV — there's no associated data direct device for the given context. it's giving "nobody's home" 🫠
• ENOSPC — the input buffer size is too small to hold the full sysfs path. your buf simply did not eat enough to hold the whole thing, and honestly? it's giving cramped. 😭

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🦋 NOTES 🦋

okay this bit is important so pay attention: upon success, the caller should add the /sys/ prefix to get the full sysfs path. yes, you have to do it. the function hands you the path and you finish the look. 💅✨

literally don't forget the /sys/ prefix. ngl it's the whole point of the note. 🙈

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🌈 SEE ALSO 🌈

• mlx5dv_reg_dmabuf_mr(3) — go read this one next, iykyk 💜

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🍓 AUTHOR 🍓

Yishai Hadas <yishaih@nvidia.com> — thank you for your service, icon 👑

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and that's the whole page, bestie 🧚 this was mlx5dv_get_data_direct_sysfs_path(3), brought to you by the mlx5dv_get_data_direct_sysfs_path(3) manual page itself — same title in the header, same title down in the footer, the way that it's bookended is honestly iconic. periodt. 💅⭐