udp: Prepare udp.c to be shared with vhost-user

Export udp_payload_t, udp_update_hdr4(), udp_update_hdr6() and
udp_sock_errs().

Rename udp_listen_sock_handler() to udp_buf_listen_sock_handler() and
udp_reply_sock_handler to udp_buf_reply_sock_handler().

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>

udp.c

@@ -109,8 +109,7 @@
 #include "pcap.h"
 #include "log.h"
 #include "flow_table.h"
-
+#include "udp_internal.h"
-#define UDP_MAX_FRAMES		32  /* max # of frames to receive at once */
 
 /* "Spliced" sockets indexed by bound port (host order) */
 static int udp_splice_ns  [IP_VERSIONS][NUM_PORTS];
@@ -118,20 +117,8 @@ static int udp_splice_init[IP_VERSIONS][NUM_PORTS];
 
 /* Static buffers */
 
-/**
+/* UDP header and data for inbound messages */
- * struct udp_payload_t - UDP header and data for inbound messages
+static struct udp_payload_t udp_payload[UDP_MAX_FRAMES];
- * @uh:		UDP header
- * @data:	UDP data
- */
-static struct udp_payload_t {
-	struct udphdr uh;
-	char data[USHRT_MAX - sizeof(struct udphdr)];
-#ifdef __AVX2__
-} __attribute__ ((packed, aligned(32)))
-#else
-} __attribute__ ((packed, aligned(__alignof__(unsigned int))))
-#endif
-udp_payload[UDP_MAX_FRAMES];
 
 /* Ethernet header for IPv4 frames */
 static struct ethhdr udp4_eth_hdr;
@@ -302,7 +289,7 @@ static void udp_splice_send(const struct ctx *c, size_t start, size_t n,
  *
  * Return: size of IPv4 payload (UDP header + data)
  */
-static size_t udp_update_hdr4(struct iphdr *ip4h, struct udp_payload_t *bp,
+size_t udp_update_hdr4(struct iphdr *ip4h, struct udp_payload_t *bp,
 		       const struct flowside *toside, size_t dlen,
 		       bool no_udp_csum)
 {
@@ -345,7 +332,7 @@ static size_t udp_update_hdr4(struct iphdr *ip4h, struct udp_payload_t *bp,
  *
  * Return: size of IPv6 payload (UDP header + data)
  */
-static size_t udp_update_hdr6(struct ipv6hdr *ip6h, struct udp_payload_t *bp,
+size_t udp_update_hdr6(struct ipv6hdr *ip6h, struct udp_payload_t *bp,
 		       const struct flowside *toside, size_t dlen,
 		       bool no_udp_csum)
 {
@@ -477,7 +464,7 @@ static int udp_sock_recverr(int s)
  *
  * Return: Number of errors handled, or < 0 if we have an unrecoverable error
  */
-static int udp_sock_errs(const struct ctx *c, int s, uint32_t events)
+int udp_sock_errs(const struct ctx *c, int s, uint32_t events)
 {
 	unsigned n_err = 0;
 	socklen_t errlen;
@@ -554,7 +541,7 @@ static int udp_sock_recv(const struct ctx *c, int s, uint32_t events,
 }
 
 /**
- * udp_listen_sock_handler() - Handle new data from socket
+ * udp_buf_listen_sock_handler() - Handle new data from socket
  * @c:		Execution context
  * @ref:	epoll reference
  * @events:	epoll events bitmap
@@ -562,8 +549,9 @@ static int udp_sock_recv(const struct ctx *c, int s, uint32_t events,
  *
  * #syscalls recvmmsg
  */
-void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
+static void udp_buf_listen_sock_handler(const struct ctx *c,
-			     uint32_t events, const struct timespec *now)
+					union epoll_ref ref, uint32_t events,
+					const struct timespec *now)
 {
 	const socklen_t sasize = sizeof(udp_meta[0].s_in);
 	int n, i;
@@ -630,7 +618,21 @@ void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
 }
 
 /**
- * udp_reply_sock_handler() - Handle new data from flow specific socket
+ * udp_listen_sock_handler() - Handle new data from socket
+ * @c:		Execution context
+ * @ref:	epoll reference
+ * @events:	epoll events bitmap
+ * @now:	Current timestamp
+ */
+void udp_listen_sock_handler(const struct ctx *c,
+			     union epoll_ref ref, uint32_t events,
+			     const struct timespec *now)
+{
+	udp_buf_listen_sock_handler(c, ref, events, now);
+}
+
+/**
+ * udp_buf_reply_sock_handler() - Handle new data from flow specific socket
  * @c:		Execution context
  * @ref:	epoll reference
  * @events:	epoll events bitmap
@@ -638,8 +640,9 @@ void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
  *
  * #syscalls recvmmsg
  */
-void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
+static void udp_buf_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
-			    uint32_t events, const struct timespec *now)
+				       uint32_t events,
+				       const struct timespec *now)
 {
 	flow_sidx_t tosidx = flow_sidx_opposite(ref.flowside);
 	const struct flowside *toside = flowside_at_sidx(tosidx);
@@ -685,6 +688,19 @@ void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
 	}
 }
 
+/**
+ * udp_reply_sock_handler() - Handle new data from flow specific socket
+ * @c:		Execution context
+ * @ref:	epoll reference
+ * @events:	epoll events bitmap
+ * @now:	Current timestamp
+ */
+void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
+			    uint32_t events, const struct timespec *now)
+{
+	udp_buf_reply_sock_handler(c, ref, events, now);
+}
+
 /**
  * udp_tap_handler() - Handle packets from tap
  * @c:		Execution context

udp_internal.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright (c) 2021 Red Hat GmbH
+ * Author: Stefano Brivio <sbrivio@redhat.com>
+ */
+
+#ifndef UDP_INTERNAL_H
+#define UDP_INTERNAL_H
+
+#include "tap.h" /* needed by udp_meta_t */
+
+#define UDP_MAX_FRAMES		32  /* max # of frames to receive at once */
+
+/**
+ * struct udp_payload_t - UDP header and data for inbound messages
+ * @uh:		UDP header
+ * @data:	UDP data
+ */
+struct udp_payload_t {
+	struct udphdr uh;
+	char data[USHRT_MAX - sizeof(struct udphdr)];
+#ifdef __AVX2__
+} __attribute__ ((packed, aligned(32)));
+#else
+} __attribute__ ((packed, aligned(__alignof__(unsigned int))));
+#endif
+
+size_t udp_update_hdr4(struct iphdr *ip4h, struct udp_payload_t *bp,
+		       const struct flowside *toside, size_t dlen,
+		       bool no_udp_csum);
+size_t udp_update_hdr6(struct ipv6hdr *ip6h, struct udp_payload_t *bp,
+                       const struct flowside *toside, size_t dlen,
+		       bool no_udp_csum);
+int udp_sock_errs(const struct ctx *c, int s, uint32_t events);
+#endif /* UDP_INTERNAL_H */