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flow, tcp: Generalise connection types

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Currently TCP connections use a 1-bit selector, 'spliced', to determine the
rest of the contents of the structure.  We want to generalise the TCP
connection table to other types of flows in other protocols.  Make a start
on this by replacing the tcp_conn_common structure with a new flow_common
structure with an enum rather than a simple boolean indicating the type of
flow.

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 2023-11-30 13:02:08 +11:00 • committed by Stefano Brivio
parent ba84a3b17a
commit 16ae032608
6 changed files with 112 additions and 40 deletions

24
tcp_conn.h
View file

@ -9,19 +9,9 @@
#ifndef TCP_CONN_H
#define TCP_CONN_H
/**
* struct tcp_conn_common - Common fields for spliced and non-spliced
* @spliced: Is this a spliced connection?
*/
struct tcp_conn_common {
bool spliced :1;
};
extern const char *tcp_common_flag_str[];
/**
* struct tcp_tap_conn - Descriptor for a TCP connection (not spliced)
* @c: Fields common with tcp_splice_conn
* @f: Generic flow information
* @in_epoll: Is the connection in the epoll set?
* @next_index: Connection index of next item in hash chain, -1 for none
* @tap_mss: MSS advertised by tap/guest, rounded to 2 ^ TCP_MSS_BITS
@ -46,8 +36,8 @@ extern const char *tcp_common_flag_str[];
* @seq_init_from_tap: Initial sequence number from tap
*/
struct tcp_tap_conn {
/* Must be first element to match tcp_splice_conn */
struct tcp_conn_common c;
/* Must be first element */
struct flow_common f;
bool in_epoll :1;
int next_index :TCP_CONN_INDEX_BITS + 2;
@ -121,7 +111,7 @@ struct tcp_tap_conn {
#define SIDES 2
/**
* struct tcp_splice_conn - Descriptor for a spliced TCP connection
* @c: Fields common with tcp_tap_conn
* @f: Generic flow information
* @in_epoll: Is the connection in the epoll set?
* @s: File descriptor for sockets
* @pipe: File descriptors for pipes
@ -131,8 +121,8 @@ struct tcp_tap_conn {
* @written: Bytes written (not fully written from one other side read)
*/
struct tcp_splice_conn {
/* Must be first element to match tcp_tap_conn */
struct tcp_conn_common c;
/* Must be first element */
struct flow_common f;
bool in_epoll :1;
int s[SIDES];
@ -168,7 +158,7 @@ struct tcp_splice_conn {
* @splice: Fields specific to spliced connections
*/
union tcp_conn {
struct tcp_conn_common c;
struct flow_common f;
struct tcp_tap_conn tap;
struct tcp_splice_conn splice;
};