vhost-user: add vhost-user

add virtio and vhost-user functions to connect with QEMU.

  $ ./passt --vhost-user

and

  # qemu-system-x86_64 ... -m 4G \
        -object memory-backend-memfd,id=memfd0,share=on,size=4G \
        -numa node,memdev=memfd0 \
        -chardev socket,id=chr0,path=/tmp/passt_1.socket \
        -netdev vhost-user,id=netdev0,chardev=chr0 \
        -device virtio-net,mac=9a:2b:2c:2d:2e:2f,netdev=netdev0 \
        ...

Signed-off-by: Laurent Vivier <lvivier@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/tcp.c b/tcp.c
index 1e37714..b21da94 100644
--- a/tcp.c
+++ b/tcp.c
@@ -1049,7 +1049,8 @@ size_t tcp_fill_headers4(const struct ctx *c,
 
 	tcp_fill_header(th, conn, seq);
 
-	tcp_update_check_tcp4(iph, th);
+	if (c->mode != MODE_VU || *c->pcap)
+		tcp_update_check_tcp4(iph, th);
 
 	return ip_len;
 }
@@ -1090,7 +1091,8 @@ size_t tcp_fill_headers6(const struct ctx *c,
 
 	tcp_fill_header(th, conn, seq);
 
-	tcp_update_check_tcp6(ip6h, th);
+	if (c->mode != MODE_VU || *c->pcap)
+		tcp_update_check_tcp6(ip6h, th);
 
 	return ip_len;
 }