ib_ud_header_init(9)

🦋 ib_ud_header_init(9) — NAME 🦋

okay so bestie, welcome to the Kernel API Manual ✨ and today's main character is ib_ud_header_init — which literally just initializes a UD header structure. that's it. that's the vibe. it sets up your struct ib_ud_header so it's ready to be filled in and packed 💅

✨ SYNOPSIS ✨

int ib_ud_header_init (int payload_bytes , int lrh_present , int
eth_present , int vlan_present , int grh_present , int ip_version , int
udp_present , int immediate_present , struct ib_ud_header *header );

yep, that's a lot of ints. nine of them. count 'em. don't worry though, we're gonna go through every single one together 🫶

🎀 ARGUMENTS 🎀

• payload_bytes — how long the packet payload is. the length, the amount of bytes, the whole point 💖
• lrh_present — tells us if the LRH is present. yes or no, that's the whole job.
• eth_present — same deal but for the Eth header — is it there or not?
• vlan_present — is this packet tagged vlan? enquiring minds want to know 🧚
• grh_present — the GRH flag. if it's non-zero, the GRH will be included. no cap.
• ip_version — if non-zero, an IP header gets included, either V4 or V6. slay 🌈
• udp_present — if non-zero, a UDP header will be included. periodt.
• immediate_present — specifies if immediate data is present 🙈
• header — the structure to initialize. the actual star of the show, the main character energy 👑

🔥 SEE ALSO 🔥

• Kernel file ./drivers/infiniband/core/ud_header.c
• ib_ud_header_pack(9) — like, go read that one next, iykyk 💜

ngl bestie, if you're in ./drivers/infiniband/core you already know what's up. go build something iconic 💀✨

and that's the whole page, mwah 💋 — this little gem lives in ./drivers/infiniband/core, dated October 2026, and it's ib_ud_header_init(9) forever and always 🎀🦋⭐