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util: sock_l4() determine protocol from epoll type rather than the reverse

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sock_l4() creates a socket of the given IP protocol number, and adds it to
the epoll state.  Currently it determines the correct tag for the epoll
data based on the protocol.  However, we have some future cases where we
might want different semantics, and therefore epoll types, for sockets of
the same protocol.  So, change sock_l4() to take the epoll type as an
explicit parameter, and determine the protocol from that.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-07-05 20:43:59 +10:00 • committed by Stefano Brivio
parent b625ed5fee
commit 74c1c5efcf
7 changed files with 81 additions and 67 deletions

32
passt.h
View file

@ -23,38 +23,6 @@ union epoll_ref;
#include "tcp.h"
#include "udp.h"
/**
* enum epoll_type - Different types of fds we poll over
*/
enum epoll_type {
/* Special value to indicate an invalid type */
EPOLL_TYPE_NONE = 0,
/* Connected TCP sockets */
EPOLL_TYPE_TCP,
/* Connected TCP sockets (spliced) */
EPOLL_TYPE_TCP_SPLICE,
/* Listening TCP sockets */
EPOLL_TYPE_TCP_LISTEN,
/* timerfds used for TCP timers */
EPOLL_TYPE_TCP_TIMER,
/* UDP sockets */
EPOLL_TYPE_UDP,
/* ICMP/ICMPv6 ping sockets */
EPOLL_TYPE_PING,
/* inotify fd watching for end of netns (pasta) */
EPOLL_TYPE_NSQUIT_INOTIFY,
/* timer fd watching for end of netns, fallback for inotify (pasta) */
EPOLL_TYPE_NSQUIT_TIMER,
/* tuntap character device */
EPOLL_TYPE_TAP_PASTA,
/* socket connected to qemu */
EPOLL_TYPE_TAP_PASST,
/* socket listening for qemu socket connections */
EPOLL_TYPE_TAP_LISTEN,
EPOLL_NUM_TYPES,
};
/**
* union epoll_ref - Breakdown of reference for epoll fd bookkeeping
* @type: Type of fd (tells us what to do with events)