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flow, tcp: Move TCP connection table to unified flow table

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We want to generalise "connection" tracking to things other than true TCP
connections.  Continue implenenting this by renaming the TCP connection
table to the "flow table" and moving it to flow.c.  The definitions are
split between flow.h and flow_table.h - we need this separation to avoid
circular dependencies: the definitions in flow.h will be needed by many
headers using the flow mechanism, but flow_table.h needs all those protocol
specific headers in order to define the full flow table entry.

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 13:02:09 +11:00
committed by Stefano Brivio
parent 16ae032608
commit f08ce92a13
9 changed files with 107 additions and 82 deletions
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19
tcp_splice.c
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@@ -57,6 +57,7 @@
#include "flow.h"
#include "tcp_conn.h"
#include "flow_table.h"
#define MAX_PIPE_SIZE (8UL * 1024 * 1024)
#define TCP_SPLICE_PIPE_POOL_SIZE 32
@@ -76,7 +77,7 @@ static int splice_pipe_pool [TCP_SPLICE_PIPE_POOL_SIZE][2];
#define CONN_V4(x) (!CONN_V6(x))
#define CONN_HAS(conn, set) ((conn->events & (set)) == (set))
#define CONN(idx) (&tc[(idx)].splice)
#define CONN_IDX(conn) ((union tcp_conn *)(conn) - tc)
#define CONN_IDX(conn) ((union flow *)(conn) - flowtab)
/* Display strings for connection events */
static const char *tcp_splice_event_str[] __attribute((__unused__)) = {
@@ -254,11 +255,11 @@ void tcp_splice_conn_update(const struct ctx *c, struct tcp_splice_conn *new)
/**
* tcp_splice_destroy() - Close spliced connection and pipes, clear
* @c: Execution context
* @conn_union: Spliced connection (container union)
* @flow: Flow table entry
*/
void tcp_splice_destroy(struct ctx *c, union tcp_conn *conn_union)
void tcp_splice_destroy(struct ctx *c, union flow *flow)
{
struct tcp_splice_conn *conn = &conn_union->splice;
struct tcp_splice_conn *conn = &flow->tcp_splice;
int side;
for (side = 0; side < SIDES; side++) {
@@ -283,7 +284,7 @@ void tcp_splice_destroy(struct ctx *c, union tcp_conn *conn_union)
conn->flags = 0;
debug("TCP (spliced): index %li, CLOSED", CONN_IDX(conn));
tcp_table_compact(c, conn_union);
tcp_table_compact(c, flow);
}
/**
@@ -775,15 +776,15 @@ void tcp_splice_init(struct ctx *c)
/**
* tcp_splice_timer() - Timer for spliced connections
* @c: Execution context
* @conn_union: Spliced connection (container union)
* @flow: Flow table entry
*/
void tcp_splice_timer(struct ctx *c, union tcp_conn *conn_union)
void tcp_splice_timer(struct ctx *c, union flow *flow)
{
struct tcp_splice_conn *conn = &conn_union->splice;
struct tcp_splice_conn *conn = &flow->tcp_splice;
int side;
if (conn->flags & CLOSING) {
tcp_splice_destroy(c, conn_union);
tcp_splice_destroy(c, flow);
return;
}