cxgb4_port_idx(9)

💅 cxgb4_port_idx — from the Kernel API Manual, section 9 (9)

okay so bestie, we're in the kernel API manual — section 9 — and today's main character is cxgb4_port_idx. Yes it's a tiny one. No, that does not make it less iconic. Let's get into it 💖

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✨ NAME ✨

cxgb4_port_idx — get the index of a port 🎀

literally that's the whole job. she shows up, she hands you an index, she leaves. no cap.

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🦋 SYNOPSIS 🦋

unsigned int cxgb4_port_idx (const struct net_device *dev );

the way this signature is so clean?? returns unsigned int, takes a const struct net_device *, and the whole thing lives on one line. we love a low-drama function fr fr ✨

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🌸 ARGUMENTS 🌸

• dev — the net device for the port 🫶 that's it. that's the one (1) argument. she's the device whose port we're talking about, iykyk.

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💜 DESCRIPTION 💜

Return the index of the given port.

that's the whole description babe, and honestly? obsessed. hand her a dev for a port, she gives you back that port's index. no side quests, no surprises, no "it depends" energy. just a return value and a vibe check passed ✅

reminder bestie: the return type is unsigned int, so it's coming back as an unsigned int — not a signed one, not a void, none of that 💅

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🌈 SEE ALSO 🌈

• the kernel file ./drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c — that's where she lives, go say hi 🧚
• cxgb4_change_mac(9)
• cxgb4_write_rss(9)
• setup_rss(9)
• setup_sge_queues(9)
• cxgb4_set_rspq_intr_params(9)
• cxgb4_create_server(9)
• cxgb4_best_mtu(9)
• cxgb4_best_aligned_mtu(9)
• cxgb4_port_chan(9)
• cxgb4_port_e2cchan(9)
• cxgb4_port_viid(9)
• cxgb_up(9)

the whole friend group showed up 🫶 read them too, they're all in their cxgb4 era.

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and that's the page!! 🎀 this fine piece of documentation is living in the source tree at ./drivers/net/ethernet/chelsio... and it's dated October 2026 — so go forth, look up your port indices, and slay 💖✨👑