fc_exch_alloc(9)

✨ fc_exch_alloc(9) ✨

okay bestie, welcome to the Kernel API Manual 💅 we're doing fc_exch_alloc(9) today and it's lowkey such a vibe — it's the lil' function that gets you a brand-new exchange (that's like, a Fibre Channel conversation slot, iykyk 🦋).

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🎀 NAME 🎀

fc_exch_alloc — allocate an exchange from an EM on a local port's list of EMs 💖

like, you're literally pulling an exchange out of an exchange manager, and the EM is hanging out on your local port's little list of EMs. that's the whole gig ✨

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🌸 SYNOPSIS 🌸

struct fc_exch * fc_exch_alloc (struct fc_lport *lport , struct fc_frame
*fp );

she takes two args and hands you back a struct fc_exch * — no cap 🫶

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💜 ARGUMENTS 💜

• lport — the local port that will own the exchange 👑 so like, whoever's adopting this exchange, it's this port
• fp — the FC frame that the exchange will be for 🌈 the frame is the whole reason the exchange exists, she's just here to serve it

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🔥 DESCRIPTION 🔥

okay so here's the tea ☕ this function walks the list of exchange manager (EM) anchors to select an EM for a new exchange allocation ✨

and how does it pick? literally two ways, periodt:

1. the EM is selected when a NULL match function pointer is encountered — like, no match function? cool, you're it, congrats 🎀
2. the EM is selected when a call to a match function returns true 💅 (fr fr, that's the vibe check passing)

that's it, that's the function. she walks, she picks, she slays 🧚

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⭐ SEE ALSO ⭐

okay so this list is long long, but every single one of these is a real reference, so don't skip bestie 😭

Kernel file ./drivers/scsi/libfc/fc_exch.c 🍓

• struct fc_exch_pool(9)
• struct fc_exch_mgr(9)
• struct fc_exch_mgr_anchor(9)
• fc_exch_name_lookup(9)
• fc_exch_rctl_name(9)
• fc_exch_hold(9)
• fc_exch_setup_hdr(9)
• fc_exch_release(9)
• fc_exch_timer_cancel(9)
• fc_exch_timer_set_locked(9)
• fc_exch_timer_set(9)
• fc_exch_done_locked(9)
• fc_exch_ptr_get(9)
• fc_exch_ptr_set(9)
• fc_exch_delete(9)
• fc_seq_send(9)
• fc_seq_alloc(9)
• fc_seq_start_next_locked(9)
• fc_seq_start_next(9)
• fc_exch_abort_locked(9)
• fc_seq_exch_abort(9)
• fc_invoke_resp(9)
• fc_exch_timeout(9)
• fc_exch_em_alloc(9)
• fc_exch_find(9)
• fc_exch_done(9)
• fc_exch_resp(9)
• fc_seq_lookup_recip(9)
• fc_seq_lookup_orig(9)
• fc_exch_set_addr(9)
• fc_seq_els_rsp_send(9)
• fc_seq_send_last(9)
• fc_seq_send_ack(9)
• fc_exch_send_ba_rjt(9)
• fc_exch_recv_abts(9)
• fc_seq_assign(9)
• fc_seq_release(9)
• fc_exch_recv_req(9)
• fc_exch_recv_seq_resp(9)
• fc_exch_recv_resp(9)
• fc_exch_abts_resp(9)
• fc_exch_recv_bls(9)
• fc_seq_ls_acc(9)
• fc_seq_ls_rjt(9)
• fc_exch_reset(9)
• fc_exch_pool_reset(9)
• fc_exch_mgr_reset(9)
• fc_exch_lookup(9)
• fc_exch_els_rec(9)
• fc_exch_rrq_resp(9)
• fc_exch_seq_send(9)
• fc_exch_rrq(9)
• fc_exch_els_rrq(9)
• fc_exch_update_stats(9)
• fc_exch_mgr_add(9)
• fc_exch_mgr_destroy(9)
• fc_exch_mgr_del(9)
• fc_exch_mgr_list_clone(9)
• fc_exch_mgr_alloc(9)
• fc_exch_mgr_free(9)
• fc_find_ema(9)
• fc_exch_recv(9)
• fc_exch_init(9)
• fc_setup_exch_mgr(9)
• fc_destroy_exch_mgr(9)

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bestie there's genuinely nothing dangerous in here, she's just picking an EM and handing you an exchange — but like, always read the SEE ALSO, the lore is deep 🫶

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and that's the page!! mwah 💋 this one came from ./drivers/scsi/libfc and it's dated October 2026 — so she's serving future-fresh, iconic, no notes 👑✨🌸