es58x_sizeof_es58x_device(9)

💅 es58x_sizeof_es58x_device — kernel API manual, but make it bestie-friendly

okay so real talk, this page is es58x_sizeof_es58x_device(9) from the Kernel API Manual, and it's honestly kind of a tiny icon? Like it's one macro, it has one job, and it does it flawlessly. main character energy fr fr. let's get into it 🎀

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✨ NAME ✨

es58x_sizeof_es58x_device — calculate the maximum length of struct es58x_device.

like, the maximum length. the whole shebang. the full fit. 👑

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🌸 SYNOPSIS 🌸

size_t es58x_sizeof_es58x_device (const struct es58x_parameters
*es58x_dev_param );

it hands you back a size_t and it takes exactly one thing. no drama, no extra args, we love a low-maintenance signature 🫶

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🦋 ARGUMENTS 🦋

• es58x_dev_param — the constant parameters of the device. that's it. that's the whole input. it's const, so you are NOT allowed to mess with it, hands off bestie 🙈

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💖 DESCRIPTION 💖

okay so here's the tea: the length of struct es58x_device isn't a fixed number, it literally depends on the length of its last field — rx_cmd_buf. so like, the struct is giving variable-length finale, and this macro is how you deal with that gracefully instead of just guessing and wasting memory like a clown.

the whole point? this macro allows to optimize the memory allocation. that's it, that's the flex. it computes the size so you don't over-allocate. slay. 💅

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⭐ RETURN ⭐

returns the length of struct es58x_device. no error codes, no -1, no weird sentinel values — just the length. clean. iconic. ate and left no crumbs 🔥

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🧚 SEE ALSO 🧚

buckle up, this list is long and it's basically the whole es58x friend group. everyone showed up to the party:

• Kernel file ./drivers/net/can/usb/etas_es58x/es58x_core.h
• enum es58x_driver_info(9)
• enum es58x_physical_layer(9)
• enum es58x_sync_edge(9)
• enum es58x_flag(9)
• enum es58x_err(9)
• enum es58x_event(9)
• struct es58x_priv(9)
• struct es58x_parameters(9)
• struct es58x_operators(9)
• struct es58x_sw_version(9)
• struct es58x_hw_revision(9)
• struct es58x_device(9)
• es58x_check_msg_len(9)
• es58x_check_msg_max_len(9)
• es58x_msg_num_element(9)
• es58x_priv(9)
• ES58X_SIZEOF_URB_CMD(9)
• es58x_get_urb_cmd_len(9)
• es58x_get_netdev(9)
• es58x_get_raw_can_id(9)
• es58x_get_flags(9)

(yes es58x_priv(9) is in there twice, no I'm not gonna pretend it isn't, the page said it twice so I'm saying it twice 😭)

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ngl the only caveat-ish thing here is that this is a size maximum — the length literally shifts with rx_cmd_buf, so don't go assuming it's some universal constant. it isn't. it's personal to your device params 🍓

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and that's the page!! huge shoutout to ./drivers/net/can/usb/etas_es58x for the source, the Kernel API Manual for the home, and October 2026 for the date stamp — see u in the next manpage bestie, mwah 💜🌈✨