[PATCH] UFO patch

Hi,

Kernel version 2.6.15 onwards provides UDP Fragmentation Offload (UFO)
This patch to ethtool provides UFO (UDP Fragmentation Offload) on/off support
using -K option similar to feature TSO.

To find out whether UFO is enabled or not use
#ethtool -k eth3
Offload parameters for eth3:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
udp fragmentation offload: on
#

To turn off UFO use following command.
#ethtool -K eth3 ufo off

To turn off UFO use following command.
#ethtool -K eth3 ufo on

Please review the patch.

Signed-off-by: Ananda Raju <ananda.raju@neterion.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 32 insertions, 6 deletions

diff --git a/ethtool.c b/ethtool.c
index cc204ab..7d408be 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -144,7 +144,8 @@ static struct option {
 		"		[ rx on|off ]\n"
 		"		[ tx on|off ]\n"
 		"		[ sg on|off ]\n"
-	        "		[ tso on|off ]\n" },
+	        "		[ tso on|off ]\n"
+	        "		[ ufo on|off ]\n" },
     { "-i", "--driver", MODE_GDRV, "Show driver information" }, 
     { "-d", "--register-dump", MODE_GREGS, "Do a register dump" },
     { "-e", "--eeprom-dump", MODE_GEEPROM, "Do a EEPROM dump",
@@ -189,6 +190,7 @@ static int off_csum_rx_wanted = -1;
 static int off_csum_tx_wanted = -1;
 static int off_sg_wanted = -1;
 static int off_tso_wanted = -1;
+static int off_ufo_wanted = -1;
 
 static struct ethtool_pauseparam epause;
 static int gpause_changed = 0;
@@ -292,6 +294,7 @@ static struct cmdline_info cmdline_offload[] = {
 	{ "tx", CMDL_BOOL, &off_csum_tx_wanted, NULL },
 	{ "sg", CMDL_BOOL, &off_sg_wanted, NULL },
 	{ "tso", CMDL_BOOL, &off_tso_wanted, NULL },
+	{ "ufo", CMDL_BOOL, &off_ufo_wanted, NULL },
 };
 
 static struct cmdline_info cmdline_pause[] = {
@@ -1112,17 +1115,19 @@ static int dump_coalesce(void)
 	return 0;
 }
 
-static int dump_offload (int rx, int tx, int sg, int tso)
+static int dump_offload (int rx, int tx, int sg, int tso, int ufo)
 {
 	fprintf(stdout,
 		"rx-checksumming: %s\n"
 		"tx-checksumming: %s\n"
 		"scatter-gather: %s\n"
-		"tcp segmentation offload: %s\n",
+		"tcp segmentation offload: %s\n"
+		"udp fragmentation offload: %s\n",
 		rx ? "on" : "off",
 		tx ? "on" : "off",
 		sg ? "on" : "off",
-		tso ? "on" : "off");
+		tso ? "on" : "off",
+		ufo ? "on" : "off");
 
 	return 0;
 }
@@ -1386,7 +1391,7 @@ static int do_scoalesce(int fd, struct ifreq *ifr)
 static int do_goffload(int fd, struct ifreq *ifr)
 {
 	struct ethtool_value eval;
-	int err, allfail = 1, rx = 0, tx = 0, sg = 0, tso = 0;
+	int err, allfail = 1, rx = 0, tx = 0, sg = 0, tso = 0, ufo = 0;
 
 	fprintf(stdout, "Offload parameters for %s:\n", devname);
 
@@ -1430,12 +1435,22 @@ static int do_goffload(int fd, struct ifreq *ifr)
 		allfail = 0;
 	}
 
+	eval.cmd = ETHTOOL_GUFO;
+	ifr->ifr_data = (caddr_t)&eval;
+	err = ioctl(fd, SIOCETHTOOL, ifr);
+	if (err)
+		perror("Cannot get device udp large send offload settings");
+	else {
+		ufo = eval.data;
+		allfail = 0;
+	}
+
 	if (allfail) {
 		fprintf(stdout, "no offload info available\n");
 		return 83;
 	}
 
-	return dump_offload(rx, tx, sg, tso);
+	return dump_offload(rx, tx, sg, tso, ufo);
 }
 
 static int do_soffload(int fd, struct ifreq *ifr)
@@ -1490,6 +1505,17 @@ static int do_soffload(int fd, struct ifreq *ifr)
 			return 88;
 		}
 	}
+	if (off_ufo_wanted >= 0) {
+		changed = 1;
+		eval.cmd = ETHTOOL_SUFO;
+		eval.data = (off_ufo_wanted == 1);
+		ifr->ifr_data = (caddr_t)&eval;
+		err = ioctl(fd, SIOCETHTOOL, ifr);
+		if (err) {
+			perror("Cannot set device udp large send offload settings");
+			return 89;
+		}
+	}
 	if (!changed) {
 		fprintf(stdout, "no offload settings changed\n");
 	}