qrtr_tx_flow_failed(9)

💅 qrtr_tx_flow_failed(9) 💅

okay so bestie, we're deep in the Kernel API Manual today and this one is a whole little rescue mission, no cap. it's a kernel function page, it's giving "quietly saving your network stack from itself," and honestly? iconic. 🎀

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✨ NAME ✨

qrtr_tx_flow_failed — flag that tx of confirm_rx flagged messages failed 💀

like, literally the function that raises its hand and goes "hey, that send did NOT go through" for messages that had confirm_rx set. 🫶

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✨ SYNOPSIS ✨

void qrtr_tx_flow_failed (struct qrtr_node *node , int dest_node , int dest_port );

it returns void, so don't go looking for a return value, she gives you nothing back and that's the point. 🌸

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✨ ARGUMENTS ✨

• node — the qrtr_node that the packet is to be send to 🦋 (yes, "to be send to", the manpage said it like that, we respect the original grammar choices)
• dest_node — node id of the destination 🎯
• dest_port — port number of the destination 🔌

three little args, one big job. she's efficient. 💅

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✨ DESCRIPTION ✨

so here's the situation, and it's kind of a lot 😭. this function signals that the transmission of a message with the confirm_rx flag failed. that's it, that's the whole vibe — but the why is where it gets juicy.

without this, the flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH, and once you hit that? transmission would stall forever waiting for the resume TX message associated with the dropped confirm_rx message. forever. like, not "a while", not "a bit", forever forever. 💀 the kernel equivalent of waiting for a text back that is never coming.

the work around (and this is the main character move 🕺) is to mark the flow as having a failed transmission, and then cause the next transmission attempt to be sent with the confirm_rx. so instead of doom-waiting, the next attempt just carries the confirmation itself. problem solved, flow un-stuck, she slays. ✨👑

bestie pls note: this is a work around, not a magic cure. the flow gets marked failed and the next attempt carries confirm_rx — that's the deal on offer here, fr fr. 🙈

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✨ SEE ALSO ✨

go read these next, i'm obsessed with the whole little family 🧚:

• Kernel file ./net/qrtr/af_qrtr.c
• struct qrtr_hdr_v1(9)
• struct qrtr_hdr_v2(9)
• struct qrtr_node(9)
• struct qrtr_tx_flow(9)
• qrtr_tx_resume(9)
• qrtr_tx_wait(9)
• qrtr_endpoint_post(9)
• qrtr_alloc_ctrl_packet(9)
• qrtr_endpoint_register(9)
• qrtr_endpoint_unregister(9)

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and that's the whole page!! 🌈💖 this lil baddie lives in ./net/qrtr, and the version on the tin says October 2026. ok bye bestie, go fix those flows, you're gonna do amazing 🫶🎀⭐