pio_kernel_linkup(9)

🎀 pio_kernel_linkup(9) 🎀

okay bestie, welcome to the Kernel API Manual page for pio_kernel_linkup(9) — it’s giving “Re-enable send contexts after linkup event,” and we’re gonna get into it. ✨

✨ NAME ✨

pio_kernel_linkup — Re-enable send contexts after linkup event 💅

🦋 SYNOPSIS 🦋

void pio_kernel_linkup (struct hfi1_devdata *dd );

🌸 ARGUMENTS 🌸

• dd — valid devive data 🫶 (keeping that spelling exactly as the page says, bestie — no cap)

💖 DESCRIPTION 💖

so when the link goes down, the freeze path is taken. but a link down event is different from a freeze, because if the send context is re-enabled, whowever is sending data will start sending data again, which will hang any QP that is sending data. 😭

the freeze path now looks at the type of event that occurs and takes this path for link down event. periodt. ✨

🔥 SEE ALSO 🔥

• Kernel file ./drivers/infiniband/hw/hfi1/pio.c
• sc_wait_for_packet_egress(9)
• sc_piobufavail(9)

mwah 💋 this gem lives under ./drivers/infiniband/hw/hfi1, and the page is dated October 2026 — source/version and date noted, bestie, we’re done here. 🎀