qbman_swp_fq_xon(9)

💅 qbman_swp_fq_xon(9) — or, as the kernel calls it, the qbman page in the Kernel API Manual

Hey bestie, welcome to the glo-up of qbman_swp_fq_xon 💖 This is a kernel API manual page, and yes, it's about flow control for frame queues. Stay with me, it's actually lowkey iconic.

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✨ NAME ✨

qbman_swp_fq_xon — sets FQ flow-control to XON 🟢

Like, it flips the "you may pass" sign back on for a frame queue. No cap.

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🎀 SYNOPSIS 🎀

int qbman_swp_fq_xon (struct qbman_swp *s , u32 fqid );

Copy that exactly, babe — spaces and all. Do not "fix" the formatting, she's perfect the way she is 💅

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🌸 ARGUMENTS 🌸

• s — the software portal object. This is your main character — the swp you're working through 🫶
• fqid — the index of the frame queue. That's the FQ you're about to bless with XON ✨

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🦋 DESCRIPTION 🦋

Ok so here's the tea ☕: this setting doesn't affect enqueues to the FQ — just dequeues. Read that again. Enqueues: untouched. Dequeues: that's who this is for. 💀

And the return situation:

Returns 0 for success, or a negative error code for failure. So like, check your return value, bestie, don't just ghost it 😭

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🌈 SEE ALSO 🌈

Go touch some related grass, iykyk:

• The kernel file ./drivers/soc/fsl/dpio/qbman-portal.h
• qbman_swp_enqueue(9)
• qbman_swp_enqueue_multiple(9)
• qbman_swp_enqueue_multiple_desc(9)
• qbman_result_is_DQ(9)
• qbman_result_is_SCN(9)
• qbman_result_SCN_state(9)
• qbman_result_SCN_rid(9)
• qbman_result_SCN_ctx(9)
• qbman_swp_fq_schedule(9)
• qbman_swp_fq_force(9)
• qbman_swp_fq_xoff(9) ← the villain origin story of this page, honestly 🧚
• qbman_swp_CDAN_set_context(9)
• qbman_swp_CDAN_enable(9)
• qbman_swp_CDAN_disable(9)
• qbman_swp_CDAN_set_context_enable(9)
• qbman_swp_release(9)
• qbman_swp_pull(9)
• qbman_swp_dqrr_next(9)

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✨ That's the whole page, bestie ✨ Shoutout to ./drivers/soc/fsl/dpio for being the source, dated October 2026, and to qbman_swp_fq_xon(9) for keeping it real. Periodt. 💜🎀