hfi1_may_ecn(9)

✨ hfi1_may_ecn(9) ✨

okay so bestie, welcome to the hfi1_may_ecn page 💅 this one lives in the Kernel API Manual and honestly? it's a little vibe check for your packet's congestion bits. let's get into it 🫶

---

🌸 NAME 🌸

hfi1_may_ecn — check whether FECN or BECN processing should be done 🎀

---

🦋 SYNOPSIS 🦋

bool hfi1_may_ecn (struct hfi1_packet *pkt );

like, it returns a bool, takes one pointer, that's the whole thing, no cap ✨

---

🍓 ARGUMENTS 🍓

• pkt — the packet to be evaluated 👀 hand it the packet, it'll peer at it

---

💜 DESCRIPTION 💜

So what it does is: it checks whether the FECN or BECN bits in the packet's header are enabled, and that check depends on the packet type 🎀

real talk though — this function only checks for FECN and BECN bits, that's its whole personality 💀 additional checks are done in the slowpath (hfi1_process_ecn_slowpath) so that correct handling actually happens. so like, don't skip the slowpath and expect things to be fine, because they will not be fine 🙈

---

🔥 SEE ALSO 🔥

Kernel file ./drivers/infiniband/hw/hfi1/hfi.h — and here's the whole friend group, iykyk:

• rcvhdrq_size(9)
• hfi1_get_rc_ohdr(9)
• hfi1_rcd_head(9)
• hfi1_set_rcd_head(9)
• hfi1_seq_incr_wrap(9)
• hfi1_seq_cnt(9)
• hfi1_set_seq_cnt(9)
• last_rcv_seq(9)
• get_hdrqentsize(9)
• get_hdrq_cnt(9)
• hfi1_is_slowpath(9)
• hfi1_is_fastpath(9)
• hfi1_set_fast(9)
• sc_to_vlt(9)
• hfi1_rcvhdrtail_kvaddr(9)
• hfi1_need_drop(9)

---

and that's the whole page bestie, go forth and check those bits 🌈

signed, sealed, delivered with love from ./drivers/infiniband/hw/hfi1 — October 2026 🧚💖 (that's the source path and the date, in case you were wondering, and yes i remembered them, you're welcome 😭👑)