flow: Remove EPOLLFD_ID_INVALIDHEAD2026_01_20.386b5f5master

As all flows are now registered with an epollid at creation, we no
longer need to test if a flow is in epoll.  Remove all related code
including flow_in_epoll() and flow_epollid_clear().

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

5 files changed, 4 insertions, 40 deletions

diff --git a/flow.c b/flow.c
index ca569b5..fd4d5f3 100644
--- a/flow.c
+++ b/flow.c
@@ -127,7 +127,7 @@ static_assert(ARRAY_SIZE(flow_epoll) == FLOW_NUM_TYPES,
 unsigned flow_first_free;
 union flow flowtab[FLOW_MAX];
 static const union flow *flow_new_entry; /* = NULL */
-static int epoll_id_to_fd[EPOLLFD_ID_MAX];
+static int epoll_id_to_fd[EPOLLFD_ID_SIZE];
 
 /* Hash table to index it */
 #define FLOW_HASH_LOAD		70		/* % */
@@ -352,18 +352,6 @@ static void flow_set_state(struct flow_common *f, enum flow_state state)
 }
 
 /**
- * flow_in_epoll() - Check if flow is registered with an epoll instance
- * @f:		Flow to check
- *
- * Return: true if flow is registered with epoll, false otherwise
- */
-/* cppcheck-suppress unusedFunction */
-bool flow_in_epoll(const struct flow_common *f)
-{
-	return f->epollid != EPOLLFD_ID_INVALID;
-}
-
-/**
  * flow_epollfd() - Get the epoll file descriptor for a flow
  * @f:		Flow to query
  *
@@ -371,13 +359,6 @@ bool flow_in_epoll(const struct flow_common *f)
  */
 int flow_epollfd(const struct flow_common *f)
 {
-	if (f->epollid >= EPOLLFD_ID_MAX) {
-		flow_log_(f, true, LOG_WARNING,
-			  "Invalid epollid %i for flow, assuming default",
-			  f->epollid);
-		return epoll_id_to_fd[EPOLLFD_ID_DEFAULT];
-	}
-
 	return epoll_id_to_fd[f->epollid];
 }
 
@@ -388,21 +369,12 @@ int flow_epollfd(const struct flow_common *f)
  */
 void flow_epollid_set(struct flow_common *f, int epollid)
 {
-	ASSERT(epollid < EPOLLFD_ID_MAX);
+	ASSERT(epollid < EPOLLFD_ID_SIZE);
 
 	f->epollid = epollid;
 }
 
 /**
- * flow_epollid_clear() - Clear the flow epoll id
- * @f:		Flow to update
- */
-void flow_epollid_clear(struct flow_common *f)
-{
-	f->epollid = EPOLLFD_ID_INVALID;
-}
-
-/**
  * flow_epoll_set() - Add or modify epoll registration for a flow socket
  * @f:		Flow to register socket for
  * @command:	epoll_ctl() command: EPOLL_CTL_ADD or EPOLL_CTL_MOD
@@ -435,7 +407,7 @@ int flow_epoll_set(const struct flow_common *f, int command, uint32_t events,
  */
 void flow_epollid_register(int epollid, int epollfd)
 {
-	ASSERT(epollid < EPOLLFD_ID_MAX);
+	ASSERT(epollid < EPOLLFD_ID_SIZE);
 
 	epoll_id_to_fd[epollid] = epollfd;
 }
@@ -674,7 +646,6 @@ union flow *flow_alloc(void)
 
 	flow_new_entry = flow;
 	memset(flow, 0, sizeof(*flow));
-	flow_epollid_clear(&flow->f);
 	flow_set_state(&flow->f, FLOW_STATE_NEW);
 
 	return flow;
diff --git a/flow.h b/flow.h
index a74e135..d636358 100644
--- a/flow.h
+++ b/flow.h
@@ -178,7 +178,7 @@ int flowside_connect(const struct ctx *c, int s,
  * @pif[]:	Interface for each side of the flow
  * @side[]:	Information for each side of the flow
  * @tap_omac:	MAC address of remote endpoint as seen from the guest
- * @epollid:	epollfd identifier, or EPOLLFD_ID_INVALID
+ * @epollid:	epollfd identifier
  */
 struct flow_common {
 #ifdef __GNUC__
@@ -203,8 +203,6 @@ struct flow_common {
 
 #define EPOLLFD_ID_DEFAULT	0
 #define EPOLLFD_ID_SIZE		(1 << EPOLLFD_ID_BITS)
-#define EPOLLFD_ID_MAX		(EPOLLFD_ID_SIZE - 1)
-#define EPOLLFD_ID_INVALID	EPOLLFD_ID_MAX
 
 #define FLOW_INDEX_BITS		17	/* 128k - 1 */
 #define FLOW_MAX		MAX_FROM_BITS(FLOW_INDEX_BITS)
@@ -261,10 +259,8 @@ flow_sidx_t flow_lookup_sa(const struct ctx *c, uint8_t proto, uint8_t pif,
 union flow;
 
 void flow_init(void);
-bool flow_in_epoll(const struct flow_common *f);
 int flow_epollfd(const struct flow_common *f);
 void flow_epollid_set(struct flow_common *f, int epollid);
-void flow_epollid_clear(struct flow_common *f);
 int flow_epoll_set(const struct flow_common *f, int command, uint32_t events,
 		   int fd, unsigned int sidei);
 void flow_epollid_register(int epollid, int epollfd);
diff --git a/icmp.c b/icmp.c
index 328fd6e..0b0f593 100644
--- a/icmp.c
+++ b/icmp.c
@@ -213,7 +213,6 @@ static struct icmp_ping_flow *icmp_ping_new(const struct ctx *c,
 	if (flow_epoll_set(&pingf->f, EPOLL_CTL_ADD, EPOLLIN, pingf->sock,
 			   TGTSIDE) < 0) {
 		close(pingf->sock);
-		flow_epollid_clear(&pingf->f);
 		goto cancel;
 	}
 
diff --git a/tcp.c b/tcp.c
index 21146de..6a26826 100644
--- a/tcp.c
+++ b/tcp.c
@@ -3625,7 +3625,6 @@ static int tcp_flow_repair_connect(const struct ctx *c,
 		return rc;
 	}
 
-	flow_epollid_clear(&conn->f);
 	conn->timer = -1;
 	conn->listening_sock = -1;
 
diff --git a/udp_flow.c b/udp_flow.c
index bcf31e3..1f5e84e 100644
--- a/udp_flow.c
+++ b/udp_flow.c
@@ -86,7 +86,6 @@ static int udp_flow_sock(const struct ctx *c,
 	flow_epollid_set(&uflow->f, EPOLLFD_ID_DEFAULT);
 	if (flow_epoll_set(&uflow->f, EPOLL_CTL_ADD, EPOLLIN, s, sidei) < 0) {
 		rc = -errno;
-		flow_epollid_clear(&uflow->f);
 		close(s);
 		return rc;
 	}