From: Michael Tremer <michael.tremer@ipfire.org>
Date: Wed, 20 Oct 2021 18:15:33 +0000 (+0000)
Subject: Enable ZEROCOPY
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=326ee97b34082bf690493e54f9233d089b9b296b;p=fireperf.git

Enable ZEROCOPY

https://www.kernel.org/doc/html/latest/networking/msg_zerocopy.html

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/main.c b/src/main.c
index 3af95bc..1d996cd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -459,7 +459,7 @@ int handle_connection_send(struct fireperf_config* conf,
 	}
 
 	do {
-		bytes_sent = send(fd, buffer, SOCKET_SEND_BUFFER_SIZE, 0);
+		bytes_sent = send(fd, buffer, SOCKET_SEND_BUFFER_SIZE, MSG_ZEROCOPY);
 	} while (bytes_sent < 0 && (errno == EAGAIN || errno == EWOULDBLOCK));
 
 	// Update statistics
diff --git a/src/server.c b/src/server.c
index e332b2d..19cc345 100644
--- a/src/server.c
+++ b/src/server.c
@@ -102,6 +102,14 @@ static int create_socket(struct fireperf_config* conf, int i) {
 		goto ERROR;
 	}
 
+	// Enable zero-copy
+	r = setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &flags, sizeof(flags));
+	if (r) {
+		ERROR(conf, "Could not set SO_ZEROCOPY on socket %d: %s\n",
+			fd, strerror(errno));
+		goto ERROR;
+	}
+
 	// Set socket buffer sizes
 	r = set_socket_buffer_sizes(conf, fd);
 	if (r)