Subj : src/ssh/deucessh.h ssh-conn.c ssh-trans.c ssh-trans.h
To   : Git commit to main/sbbs/master
From : Deucе
Date : Wed Apr 01 2026 16:21:56

https://gitlab.synchro.net/main/sbbs/-/commit/16c176989d30e9be671e9e18
Modified Files:
	src/ssh/deucessh.h ssh-conn.c ssh-trans.c ssh-trans.h
Log Message:
Add optional scatter/gather TX callback for batched sends

Factor tx_finalize into tx_finalize_prepare (padding, MAC, encrypt,
advance tx_seq) and tx_update_counters, enabling preparation of
multiple packets before a single I/O callback.

New public API: dssh_transport_set_tx_gather() registers an optional
callback that receives an iov array of wire-ready packet segments.
When set, all TX paths (send_packet, zc_send_inner, send_to_slot,
send_to_wa_slot) batch pending slot packets with the caller's data
packet into a single gather call, enabling writev()-style sends.

tx_gather_with_packet() is the shared internal helper: gathers up
to DSSH_TX_IOV_MAX ready slot packets (session-priority, channel
round-robin) plus one caller packet into a stack iov array, calls
tx_gather, and signals cleared slots.  Remaining slots beyond the
iov limit stay ready for the next drain pass.

Contract: callback returns 0 (all sent) or negative (error, unknown
bytes on wire — session terminated).  Backward compatible: NULL
tx_gather preserves per-packet gconf.tx behavior unchanged.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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