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tcp: Move socket pool declarations around

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tcp_splice.c has some explicit extern declarations to access the
socket pools.  This is pretty dangerous - if we changed the type of
these variables in tcp.c, we'd have tcp.c and tcp_splice.c using the
same memory in different ways with no compiler error.  So, move the
extern declarations to tcp_conn.h so they're visible to both tcp.c and
tcp_splice.c, but not the rest of pasta.

In fact the pools for the guest namespace are necessarily only used by
tcp_splice.c - we have no sockets on the guest side if we're not
splicing.  So move those declarations and the functions that deal
exclusively with them to tcp_splice.c

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 2023-02-14 10:48:21 +11:00 committed by Stefano Brivio
parent c8993476d5
commit 912d37cd5b
4 changed files with 55 additions and 48 deletions
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41
tcp.c
View File

@ -369,8 +369,6 @@ struct tcp6_l2_head { /* For MSS6 macro: keep in sync with tcp6_l2_buf_t */
#define FIN_TIMEOUT 60
#define ACT_TIMEOUT 7200
#define TCP_SOCK_POOL_TSH 16 /* Refill in ns if > x used */
#define LOW_RTT_TABLE_SIZE 8
#define LOW_RTT_THRESHOLD 10 /* us */
@ -594,11 +592,9 @@ static inline struct tcp_tap_conn *conn_at_idx(int index)
/* Table for lookup from remote address, local port, remote port */
static struct tcp_tap_conn *tc_hash[TCP_HASH_TABLE_SIZE];
/* Pools for pre-opened sockets */
/* Pools for pre-opened sockets (in init) */
int init_sock_pool4 [TCP_SOCK_POOL_SIZE];
int init_sock_pool6 [TCP_SOCK_POOL_SIZE];
int ns_sock_pool4 [TCP_SOCK_POOL_SIZE];
int ns_sock_pool6 [TCP_SOCK_POOL_SIZE];
/**
* tcp_conn_epoll_events() - epoll events mask for given connection state
@ -3015,7 +3011,7 @@ static int tcp_ns_socks_init(void *arg)
* @pool: Pool of sockets to refill
* @af: Address family to use
*/
static void tcp_sock_refill_pool(const struct ctx *c, int pool[], int af)
void tcp_sock_refill_pool(const struct ctx *c, int pool[], int af)
{
int i;
@ -3049,26 +3045,6 @@ static void tcp_sock_refill_init(const struct ctx *c)
tcp_sock_refill_pool(c, init_sock_pool6, AF_INET6);
}
/**
* tcp_sock_refill_ns() - Refill pools of pre-opened sockets in namespace
* @arg: Execution context cast to void *
*
* Return: 0
*/
static int tcp_sock_refill_ns(void *arg)
{
const struct ctx *c = (const struct ctx *)arg;
ns_enter(c);
if (c->ifi4)
tcp_sock_refill_pool(c, ns_sock_pool4, AF_INET);
if (c->ifi6)
tcp_sock_refill_pool(c, ns_sock_pool6, AF_INET6);
return 0;
}
/**
* tcp_init() - Get initial sequence, hash secret, initialise per-socket data
* @c: Execution context
@ -3117,8 +3093,6 @@ int tcp_init(struct ctx *c)
memset(init_sock_pool4, 0xff, sizeof(init_sock_pool4));
memset(init_sock_pool6, 0xff, sizeof(init_sock_pool6));
memset(ns_sock_pool4, 0xff, sizeof(ns_sock_pool4));
memset(ns_sock_pool6, 0xff, sizeof(ns_sock_pool6));
memset(tcp_sock_init_ext, 0xff, sizeof(tcp_sock_init_ext));
memset(tcp_sock_ns, 0xff, sizeof(tcp_sock_ns));
@ -3128,8 +3102,6 @@ int tcp_init(struct ctx *c)
tcp_splice_init(c);
NS_CALL(tcp_ns_socks_init, c);
NS_CALL(tcp_sock_refill_ns, c);
}
return 0;
@ -3282,11 +3254,6 @@ void tcp_timer(struct ctx *c, const struct timespec *ts)
}
tcp_sock_refill_init(c);
if (c->mode == MODE_PASTA) {
if ((c->ifi4 && ns_sock_pool4[TCP_SOCK_POOL_TSH] < 0) ||
(c->ifi6 && ns_sock_pool6[TCP_SOCK_POOL_TSH] < 0))
NS_CALL(tcp_sock_refill_ns, c);
tcp_splice_pipe_refill(c);
}
if (c->mode == MODE_PASTA)
tcp_splice_refill(c);
}

2
tcp.h
View File

@ -11,8 +11,6 @@
#define TCP_CONN_INDEX_BITS 17 /* 128k */
#define TCP_MAX_CONNS (1 << TCP_CONN_INDEX_BITS)
#define TCP_SOCK_POOL_SIZE 32
struct ctx;
void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,

10
tcp_conn.h
View File

@ -182,11 +182,17 @@ union tcp_conn {
/* TCP connections */
extern union tcp_conn tc[];
/* Socket pools */
#define TCP_SOCK_POOL_SIZE 32
extern int init_sock_pool4 [TCP_SOCK_POOL_SIZE];
extern int init_sock_pool6 [TCP_SOCK_POOL_SIZE];
void tcp_splice_conn_update(struct ctx *c, struct tcp_splice_conn *new);
void tcp_table_compact(struct ctx *c, union tcp_conn *hole);
void tcp_splice_destroy(struct ctx *c, union tcp_conn *conn_union);
void tcp_splice_timer(struct ctx *c, union tcp_conn *conn_union);
void tcp_splice_pipe_refill(const struct ctx *c);
void tcp_sock_refill_pool(const struct ctx *c, int pool[], int af);
void tcp_splice_refill(const struct ctx *c);
#endif /* TCP_CONN_H */

50
tcp_splice.c
View File

@ -60,11 +60,11 @@
#define TCP_SPLICE_CONN_PRESSURE 30 /* % of conn_count */
#define TCP_SPLICE_FILE_PRESSURE 30 /* % of c->nofile */
/* From tcp.c */
extern int init_sock_pool4 [TCP_SOCK_POOL_SIZE];
extern int init_sock_pool6 [TCP_SOCK_POOL_SIZE];
extern int ns_sock_pool4 [TCP_SOCK_POOL_SIZE];
extern int ns_sock_pool6 [TCP_SOCK_POOL_SIZE];
/* Pools for pre-opened sockets (in namespace) */
#define TCP_SOCK_POOL_TSH 16 /* Refill in ns if > x used */
static int ns_sock_pool4 [TCP_SOCK_POOL_SIZE];
static int ns_sock_pool6 [TCP_SOCK_POOL_SIZE];
/* Pool of pre-opened pipes */
static int splice_pipe_pool [TCP_SPLICE_PIPE_POOL_SIZE][2][2];
@ -782,7 +782,7 @@ smaller:
* tcp_splice_pipe_refill() - Refill pool of pre-opened pipes
* @c: Execution context
*/
void tcp_splice_pipe_refill(const struct ctx *c)
static void tcp_splice_pipe_refill(const struct ctx *c)
{
int i;
@ -811,6 +811,39 @@ void tcp_splice_pipe_refill(const struct ctx *c)
}
}
/**
* tcp_sock_refill_ns() - Refill pools of pre-opened sockets in namespace
* @arg: Execution context cast to void *
*
* Return: 0
*/
static int tcp_sock_refill_ns(void *arg)
{
const struct ctx *c = (const struct ctx *)arg;
ns_enter(c);
if (c->ifi4)
tcp_sock_refill_pool(c, ns_sock_pool4, AF_INET);
if (c->ifi6)
tcp_sock_refill_pool(c, ns_sock_pool6, AF_INET6);
return 0;
}
/**
* tcp_splice_refill() - Refill pools of resources needed for splicing
* @c: Execution context
*/
void tcp_splice_refill(const struct ctx *c)
{
if ((c->ifi4 && ns_sock_pool4[TCP_SOCK_POOL_TSH] < 0) ||
(c->ifi6 && ns_sock_pool6[TCP_SOCK_POOL_TSH] < 0))
NS_CALL(tcp_sock_refill_ns, c);
tcp_splice_pipe_refill(c);
}
/**
* tcp_splice_init() - Initialise pipe pool and size
* @c: Execution context
@ -819,7 +852,10 @@ void tcp_splice_init(struct ctx *c)
{
memset(splice_pipe_pool, 0xff, sizeof(splice_pipe_pool));
tcp_set_pipe_size(c);
tcp_splice_pipe_refill(c);
memset(&ns_sock_pool4, 0xff, sizeof(ns_sock_pool4));
memset(&ns_sock_pool6, 0xff, sizeof(ns_sock_pool6));
NS_CALL(tcp_sock_refill_ns, c);
}
/**