From: David Gibson <david@gibson.dropbear.id.au>
To: passt-dev@passt.top, Stefano Brivio <sbrivio@redhat.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Subject: [PATCH v3 04/16] flow, tcp: Consolidate flow pointer<->index helpers
Date: Thu, 30 Nov 2023 13:02:10 +1100 [thread overview]
Message-ID: <20231130020222.4056647-5-david@gibson.dropbear.id.au> (raw)
In-Reply-To: <20231130020222.4056647-1-david@gibson.dropbear.id.au>
Both tcp.c and tcp_splice.c define CONN_IDX() variants to find the index
of their connection structures in the connection table, now become the
unified flow table. We can easily combine these into a common helper.
While we're there, add some trickery for some additional type safety.
They also define their own CONN() versions, which aren't so easily combined
since they need to return different types, but we can have them use a
common helper.
In the process, we standardise on always using an unsigned type to store
the connection / flow index, which makes more sense. tcp.c's conn_at_idx()
remains for now, but we change its parameter to unsigned to match. That in
turn means we can remove a check for negative values from it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
flow_table.h | 25 ++++++++++++++++++++
tcp.c | 65 ++++++++++++++++++++++++++--------------------------
tcp_conn.h | 2 +-
tcp_splice.c | 21 ++++++++---------
4 files changed, 68 insertions(+), 45 deletions(-)
diff --git a/flow_table.h b/flow_table.h
index c4c646b..5e897bd 100644
--- a/flow_table.h
+++ b/flow_table.h
@@ -22,4 +22,29 @@ union flow {
/* Global Flow Table */
extern union flow flowtab[];
+
+/** flow_idx - Index of flow from common structure
+ * @f: Common flow fields pointer
+ *
+ * Return: index of @f in the flow table
+ */
+static inline unsigned flow_idx(const struct flow_common *f)
+{
+ return (union flow *)f - flowtab;
+}
+
+/** FLOW_IDX - Find the index of a flow
+ * @f_: Flow pointer, either union flow * or protocol specific
+ *
+ * Return: index of @f in the flow table
+ */
+#define FLOW_IDX(f_) (flow_idx(&(f_)->f))
+
+/** FLOW - Flow entry at a given index
+ * @idx: Flow index
+ *
+ * Return: pointer to entry @idx in the flow table
+ */
+#define FLOW(idx) (&flowtab[(idx)])
+
#endif /* FLOW_TABLE_H */
diff --git a/tcp.c b/tcp.c
index 0119bd3..859df6f 100644
--- a/tcp.c
+++ b/tcp.c
@@ -570,17 +570,16 @@ tcp6_l2_flags_buf[TCP_FRAMES_MEM];
static unsigned int tcp6_l2_flags_buf_used;
-#define CONN(idx) (&flowtab[(idx)].tcp)
-#define CONN_IDX(conn) ((union flow *)(conn) - flowtab)
+#define CONN(idx) (&(FLOW(idx)->tcp))
/** conn_at_idx() - Find a connection by index, if present
* @idx: Index of connection to lookup
*
* Return: pointer to connection, or NULL if @idx is out of bounds
*/
-static inline struct tcp_tap_conn *conn_at_idx(int idx)
+static inline struct tcp_tap_conn *conn_at_idx(unsigned idx)
{
- if ((idx < 0) || (idx >= FLOW_MAX))
+ if (idx >= FLOW_MAX)
return NULL;
ASSERT(CONN(idx)->f.type == FLOW_TCP);
return CONN(idx);
@@ -640,7 +639,7 @@ static int tcp_epoll_ctl(const struct ctx *c, struct tcp_tap_conn *conn)
{
int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
union epoll_ref ref = { .type = EPOLL_TYPE_TCP, .fd = conn->sock,
- .tcp.index = CONN_IDX(conn) };
+ .tcp.index = FLOW_IDX(conn) };
struct epoll_event ev = { .data.u64 = ref.u64 };
if (conn->events == CLOSED) {
@@ -661,7 +660,7 @@ static int tcp_epoll_ctl(const struct ctx *c, struct tcp_tap_conn *conn)
if (conn->timer != -1) {
union epoll_ref ref_t = { .type = EPOLL_TYPE_TCP_TIMER,
.fd = conn->sock,
- .tcp.index = CONN_IDX(conn) };
+ .tcp.index = FLOW_IDX(conn) };
struct epoll_event ev_t = { .data.u64 = ref_t.u64,
.events = EPOLLIN | EPOLLET };
@@ -689,7 +688,7 @@ static void tcp_timer_ctl(const struct ctx *c, struct tcp_tap_conn *conn)
if (conn->timer == -1) {
union epoll_ref ref = { .type = EPOLL_TYPE_TCP_TIMER,
.fd = conn->sock,
- .tcp.index = CONN_IDX(conn) };
+ .tcp.index = FLOW_IDX(conn) };
struct epoll_event ev = { .data.u64 = ref.u64,
.events = EPOLLIN | EPOLLET };
int fd;
@@ -725,7 +724,7 @@ static void tcp_timer_ctl(const struct ctx *c, struct tcp_tap_conn *conn)
it.it_value.tv_sec = ACT_TIMEOUT;
}
- debug("TCP: index %li, timer expires in %lu.%03lus", CONN_IDX(conn),
+ debug("TCP: index %u, timer expires in %lu.%03lus", FLOW_IDX(conn),
it.it_value.tv_sec, it.it_value.tv_nsec / 1000 / 1000);
timerfd_settime(conn->timer, 0, &it, NULL);
@@ -748,7 +747,7 @@ static void conn_flag_do(const struct ctx *c, struct tcp_tap_conn *conn,
conn->flags &= flag;
if (flag_index >= 0) {
- debug("TCP: index %li: %s dropped", CONN_IDX(conn),
+ debug("TCP: index %u: %s dropped", FLOW_IDX(conn),
tcp_flag_str[flag_index]);
}
} else {
@@ -769,7 +768,7 @@ static void conn_flag_do(const struct ctx *c, struct tcp_tap_conn *conn,
conn->flags |= flag;
if (flag_index >= 0) {
- debug("TCP: index %li: %s", CONN_IDX(conn),
+ debug("TCP: index %u: %s", FLOW_IDX(conn),
tcp_flag_str[flag_index]);
}
}
@@ -819,12 +818,12 @@ static void conn_event_do(const struct ctx *c, struct tcp_tap_conn *conn,
new += 5;
if (prev != new) {
- debug("TCP: index %li, %s: %s -> %s", CONN_IDX(conn),
+ debug("TCP: index %u, %s: %s -> %s", FLOW_IDX(conn),
num == -1 ? "CLOSED" : tcp_event_str[num],
prev == -1 ? "CLOSED" : tcp_state_str[prev],
(new == -1 || num == -1) ? "CLOSED" : tcp_state_str[new]);
} else {
- debug("TCP: index %li, %s", CONN_IDX(conn),
+ debug("TCP: index %u, %s", FLOW_IDX(conn),
num == -1 ? "CLOSED" : tcp_event_str[num]);
}
@@ -1204,11 +1203,11 @@ static void tcp_hash_insert(const struct ctx *c, struct tcp_tap_conn *conn)
int b;
b = tcp_hash(c, &conn->faddr, conn->eport, conn->fport);
- conn->next_index = tc_hash[b] ? CONN_IDX(tc_hash[b]) : -1;
+ conn->next_index = tc_hash[b] ? FLOW_IDX(tc_hash[b]) : -1U;
tc_hash[b] = conn;
- debug("TCP: hash table insert: index %li, sock %i, bucket: %i, next: "
- "%p", CONN_IDX(conn), conn->sock, b,
+ debug("TCP: hash table insert: index %u, sock %i, bucket: %i, next: "
+ "%p", FLOW_IDX(conn), conn->sock, b,
(void *)conn_at_idx(conn->next_index));
}
@@ -1234,8 +1233,8 @@ static void tcp_hash_remove(const struct ctx *c,
}
}
- debug("TCP: hash table remove: index %li, sock %i, bucket: %i, new: %p",
- CONN_IDX(conn), conn->sock, b,
+ debug("TCP: hash table remove: index %u, sock %i, bucket: %i, new: %p",
+ FLOW_IDX(conn), conn->sock, b,
(void *)(prev ? conn_at_idx(prev->next_index) : tc_hash[b]));
}
@@ -1255,16 +1254,16 @@ static void tcp_tap_conn_update(const struct ctx *c, struct tcp_tap_conn *old,
prev = entry, entry = conn_at_idx(entry->next_index)) {
if (entry == old) {
if (prev)
- prev->next_index = CONN_IDX(new);
+ prev->next_index = FLOW_IDX(new);
else
tc_hash[b] = new;
break;
}
}
- debug("TCP: hash table update: old index %li, new index %li, sock %i, "
+ debug("TCP: hash table update: old index %u, new index %u, sock %i, "
"bucket: %i, old: %p, new: %p",
- CONN_IDX(old), CONN_IDX(new), new->sock, b,
+ FLOW_IDX(old), FLOW_IDX(new), new->sock, b,
(void *)old, (void *)new);
tcp_epoll_ctl(c, new);
@@ -1307,9 +1306,9 @@ void tcp_table_compact(struct ctx *c, union flow *hole)
{
union flow *from;
- if (CONN_IDX(hole) == --c->flow_count) {
- debug("TCP: table compaction: maximum index was %li (%p)",
- CONN_IDX(hole), (void *)hole);
+ if (FLOW_IDX(hole) == --c->flow_count) {
+ debug("TCP: table compaction: maximum index was %u (%p)",
+ FLOW_IDX(hole), (void *)hole);
memset(hole, 0, sizeof(*hole));
return;
}
@@ -1329,9 +1328,9 @@ void tcp_table_compact(struct ctx *c, union flow *hole)
FLOW_TYPE(&from->f));
}
- debug("TCP: table compaction (%s): old index %li, new index %li, "
+ debug("TCP: table compaction (%s): old index %u, new index %u, "
"from: %p, to: %p",
- FLOW_TYPE(&from->f), CONN_IDX(from), CONN_IDX(hole),
+ FLOW_TYPE(&from->f), FLOW_IDX(from), FLOW_IDX(hole),
(void *)from, (void *)hole);
memset(from, 0, sizeof(*from));
@@ -1357,7 +1356,7 @@ static void tcp_conn_destroy(struct ctx *c, union flow *flow)
static void tcp_rst_do(struct ctx *c, struct tcp_tap_conn *conn);
#define tcp_rst(c, conn) \
do { \
- debug("TCP: index %li, reset at %s:%i", CONN_IDX(conn), \
+ debug("TCP: index %u, reset at %s:%i", FLOW_IDX(conn), \
__func__, __LINE__); \
tcp_rst_do(c, conn); \
} while (0)
@@ -2581,7 +2580,7 @@ int tcp_tap_handler(struct ctx *c, uint8_t pif, int af,
return 1;
}
- trace("TCP: packet length %lu from tap for index %lu", len, CONN_IDX(conn));
+ trace("TCP: packet length %lu from tap for index %u", len, FLOW_IDX(conn));
if (th->rst) {
conn_event(c, conn, CLOSED);
@@ -2821,17 +2820,17 @@ void tcp_timer_handler(struct ctx *c, union epoll_ref ref)
tcp_timer_ctl(c, conn);
} else if (conn->flags & ACK_FROM_TAP_DUE) {
if (!(conn->events & ESTABLISHED)) {
- debug("TCP: index %li, handshake timeout", CONN_IDX(conn));
+ debug("TCP: index %u, handshake timeout", FLOW_IDX(conn));
tcp_rst(c, conn);
} else if (CONN_HAS(conn, SOCK_FIN_SENT | TAP_FIN_ACKED)) {
- debug("TCP: index %li, FIN timeout", CONN_IDX(conn));
+ debug("TCP: index %u, FIN timeout", FLOW_IDX(conn));
tcp_rst(c, conn);
} else if (conn->retrans == TCP_MAX_RETRANS) {
- debug("TCP: index %li, retransmissions count exceeded",
- CONN_IDX(conn));
+ debug("TCP: index %u, retransmissions count exceeded",
+ FLOW_IDX(conn));
tcp_rst(c, conn);
} else {
- debug("TCP: index %li, ACK timeout, retry", CONN_IDX(conn));
+ debug("TCP: index %u, ACK timeout, retry", FLOW_IDX(conn));
conn->retrans++;
conn->seq_to_tap = conn->seq_ack_from_tap;
tcp_data_from_sock(c, conn);
@@ -2849,7 +2848,7 @@ void tcp_timer_handler(struct ctx *c, union epoll_ref ref)
*/
timerfd_settime(conn->timer, 0, &new, &old);
if (old.it_value.tv_sec == ACT_TIMEOUT) {
- debug("TCP: index %li, activity timeout", CONN_IDX(conn));
+ debug("TCP: index %u, activity timeout", FLOW_IDX(conn));
tcp_rst(c, conn);
}
}
diff --git a/tcp_conn.h b/tcp_conn.h
index 5a107fc..5a9376e 100644
--- a/tcp_conn.h
+++ b/tcp_conn.h
@@ -40,7 +40,7 @@ struct tcp_tap_conn {
struct flow_common f;
bool in_epoll :1;
- int next_index :FLOW_INDEX_BITS + 2;
+ unsigned next_index :FLOW_INDEX_BITS + 2;
#define TCP_RETRANS_BITS 3
unsigned int retrans :TCP_RETRANS_BITS;
diff --git a/tcp_splice.c b/tcp_splice.c
index 9f4831a..3955417 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -76,8 +76,7 @@ static int splice_pipe_pool [TCP_SPLICE_PIPE_POOL_SIZE][2];
#define CONN_V6(x) (x->flags & SPLICE_V6)
#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 flow *)(conn) - flowtab)
+#define CONN(idx) (&FLOW(idx)->tcp_splice)
/* Display strings for connection events */
static const char *tcp_splice_event_str[] __attribute((__unused__)) = {
@@ -129,8 +128,8 @@ static int tcp_splice_epoll_ctl(const struct ctx *c,
{
int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
union epoll_ref ref[SIDES] = {
- { .type = EPOLL_TYPE_TCP, .fd = conn->s[0], .tcp.index = CONN_IDX(conn) },
- { .type = EPOLL_TYPE_TCP, .fd = conn->s[1], .tcp.index = CONN_IDX(conn) }
+ { .type = EPOLL_TYPE_TCP, .fd = conn->s[0], .tcp.index = FLOW_IDX(conn) },
+ { .type = EPOLL_TYPE_TCP, .fd = conn->s[1], .tcp.index = FLOW_IDX(conn) }
};
struct epoll_event ev[SIDES] = { { .data.u64 = ref[0].u64 },
{ .data.u64 = ref[1].u64 } };
@@ -140,8 +139,8 @@ static int tcp_splice_epoll_ctl(const struct ctx *c,
if (epoll_ctl(c->epollfd, m, conn->s[0], &ev[0]) ||
epoll_ctl(c->epollfd, m, conn->s[1], &ev[1])) {
int ret = -errno;
- err("TCP (spliced): index %li, ERROR on epoll_ctl(): %s",
- CONN_IDX(conn), strerror(errno));
+ err("TCP (spliced): index %u, ERROR on epoll_ctl(): %s",
+ FLOW_IDX(conn), strerror(errno));
return ret;
}
@@ -167,7 +166,7 @@ static void conn_flag_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->flags &= flag;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li: %s dropped", CONN_IDX(conn),
+ debug("TCP (spliced): index %u: %s dropped", FLOW_IDX(conn),
tcp_splice_flag_str[flag_index]);
}
} else {
@@ -178,7 +177,7 @@ static void conn_flag_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->flags |= flag;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li: %s", CONN_IDX(conn),
+ debug("TCP (spliced): index %u: %s", FLOW_IDX(conn),
tcp_splice_flag_str[flag_index]);
}
}
@@ -213,7 +212,7 @@ static void conn_event_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->events &= event;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li, ~%s", CONN_IDX(conn),
+ debug("TCP (spliced): index %u, ~%s", FLOW_IDX(conn),
tcp_splice_event_str[flag_index]);
}
} else {
@@ -224,7 +223,7 @@ static void conn_event_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->events |= event;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li, %s", CONN_IDX(conn),
+ debug("TCP (spliced): index %u, %s", FLOW_IDX(conn),
tcp_splice_event_str[flag_index]);
}
}
@@ -282,7 +281,7 @@ void tcp_splice_destroy(struct ctx *c, union flow *flow)
conn->events = SPLICE_CLOSED;
conn->flags = 0;
- debug("TCP (spliced): index %li, CLOSED", CONN_IDX(conn));
+ debug("TCP (spliced): index %u, CLOSED", FLOW_IDX(conn));
tcp_table_compact(c, flow);
}
--
@@ -76,8 +76,7 @@ static int splice_pipe_pool [TCP_SPLICE_PIPE_POOL_SIZE][2];
#define CONN_V6(x) (x->flags & SPLICE_V6)
#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 flow *)(conn) - flowtab)
+#define CONN(idx) (&FLOW(idx)->tcp_splice)
/* Display strings for connection events */
static const char *tcp_splice_event_str[] __attribute((__unused__)) = {
@@ -129,8 +128,8 @@ static int tcp_splice_epoll_ctl(const struct ctx *c,
{
int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
union epoll_ref ref[SIDES] = {
- { .type = EPOLL_TYPE_TCP, .fd = conn->s[0], .tcp.index = CONN_IDX(conn) },
- { .type = EPOLL_TYPE_TCP, .fd = conn->s[1], .tcp.index = CONN_IDX(conn) }
+ { .type = EPOLL_TYPE_TCP, .fd = conn->s[0], .tcp.index = FLOW_IDX(conn) },
+ { .type = EPOLL_TYPE_TCP, .fd = conn->s[1], .tcp.index = FLOW_IDX(conn) }
};
struct epoll_event ev[SIDES] = { { .data.u64 = ref[0].u64 },
{ .data.u64 = ref[1].u64 } };
@@ -140,8 +139,8 @@ static int tcp_splice_epoll_ctl(const struct ctx *c,
if (epoll_ctl(c->epollfd, m, conn->s[0], &ev[0]) ||
epoll_ctl(c->epollfd, m, conn->s[1], &ev[1])) {
int ret = -errno;
- err("TCP (spliced): index %li, ERROR on epoll_ctl(): %s",
- CONN_IDX(conn), strerror(errno));
+ err("TCP (spliced): index %u, ERROR on epoll_ctl(): %s",
+ FLOW_IDX(conn), strerror(errno));
return ret;
}
@@ -167,7 +166,7 @@ static void conn_flag_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->flags &= flag;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li: %s dropped", CONN_IDX(conn),
+ debug("TCP (spliced): index %u: %s dropped", FLOW_IDX(conn),
tcp_splice_flag_str[flag_index]);
}
} else {
@@ -178,7 +177,7 @@ static void conn_flag_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->flags |= flag;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li: %s", CONN_IDX(conn),
+ debug("TCP (spliced): index %u: %s", FLOW_IDX(conn),
tcp_splice_flag_str[flag_index]);
}
}
@@ -213,7 +212,7 @@ static void conn_event_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->events &= event;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li, ~%s", CONN_IDX(conn),
+ debug("TCP (spliced): index %u, ~%s", FLOW_IDX(conn),
tcp_splice_event_str[flag_index]);
}
} else {
@@ -224,7 +223,7 @@ static void conn_event_do(const struct ctx *c, struct tcp_splice_conn *conn,
conn->events |= event;
if (flag_index >= 0) {
- debug("TCP (spliced): index %li, %s", CONN_IDX(conn),
+ debug("TCP (spliced): index %u, %s", FLOW_IDX(conn),
tcp_splice_event_str[flag_index]);
}
}
@@ -282,7 +281,7 @@ void tcp_splice_destroy(struct ctx *c, union flow *flow)
conn->events = SPLICE_CLOSED;
conn->flags = 0;
- debug("TCP (spliced): index %li, CLOSED", CONN_IDX(conn));
+ debug("TCP (spliced): index %u, CLOSED", FLOW_IDX(conn));
tcp_table_compact(c, flow);
}
--
2.43.0
next prev parent reply other threads:[~2023-11-30 2:02 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-30 2:02 [PATCH v3 00/16] Introduce unified flow table, first steps David Gibson
2023-11-30 2:02 ` [PATCH v3 01/16] treewide: Add messages to static_assert() calls David Gibson
2023-11-30 2:02 ` [PATCH v3 02/16] flow, tcp: Generalise connection types David Gibson
2023-11-30 2:02 ` [PATCH v3 03/16] flow, tcp: Move TCP connection table to unified flow table David Gibson
2023-11-30 2:02 ` David Gibson [this message]
2023-11-30 2:02 ` [PATCH v3 05/16] util: MAX_FROM_BITS() should be unsigned David Gibson
2023-11-30 2:02 ` [PATCH v3 06/16] flow: Make unified version of flow table compaction David Gibson
2023-11-30 2:02 ` [PATCH v3 07/16] flow, tcp: Add logging helpers for connection related messages David Gibson
2023-11-30 2:02 ` [PATCH v3 08/16] flow: Introduce 'sidx' type to represent one side of one flow David Gibson
2023-12-02 4:35 ` Stefano Brivio
2023-11-30 2:02 ` [PATCH v3 09/16] tcp: Remove unneccessary bounds check in tcp_timer_handler() David Gibson
2023-11-30 2:02 ` [PATCH v3 10/16] flow,tcp: Generalise TCP epoll_ref to generic flows David Gibson
2023-11-30 2:02 ` [PATCH v3 11/16] tcp_splice: Use unsigned to represent side David Gibson
2023-11-30 2:02 ` [PATCH v3 12/16] flow,tcp: Use epoll_ref type including flow and side David Gibson
2023-11-30 2:02 ` [PATCH v3 13/16] test: Avoid hitting guestfish command length limits David Gibson
2023-11-30 2:02 ` [PATCH v3 14/16] pif: Add helpers to get the name of a pif David Gibson
2023-11-30 12:45 ` Stefano Brivio
2023-12-01 0:08 ` David Gibson
2023-11-30 2:02 ` [PATCH v3 15/16] tcp: "TCP" hash secret doesn't need to be TCP specific David Gibson
2023-11-30 2:02 ` [PATCH v3 16/16] tcp: Don't defer hash table removal David Gibson
2023-11-30 12:45 ` Stefano Brivio
2023-12-01 0:07 ` David Gibson
2023-12-02 4:34 ` Stefano Brivio
2023-12-04 0:43 ` David Gibson
2023-12-04 9:54 ` [PATCH v3 00/16] Introduce unified flow table, first steps Stefano Brivio
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