[PATCH 2.6.12-rc4] ethtool: Support for UDP Large Send Offload

[ravinandan.arakali@xxxxxxxxxxxx]

Hi,
Attached below is a patch on ethtool utility to support USO(UDP Large
Send Offload).
Pls review the patch.

Usage:
1. To view USO setting
# ethtool -k <ethernet_interface>

2. To set/unset USO 
# ethtool -K <ethernet_interface> uso on|off

Signed-off-by: Ananda Raju <ananda.raju@xxxxxxxxxxxx>
Signed-off-by: Ravinandan Arakali <ravinandan.arakali@xxxxxxxxxxxx>
---
diff -uNr ethtool-3/ethtool-copy.h ethtool-3_uso/ethtool-copy.h
--- ethtool-3/ethtool-copy.h    2005-01-28 01:50:26.000000000 +0545
+++ ethtool-3_uso/ethtool-copy.h        2005-06-02 23:06:48.000000000 +0545
@@ -283,6 +283,8 @@
 #define ETHTOOL_GSTATS         0x0000001d /* get NIC-specific statistics */
 #define ETHTOOL_GTSO           0x0000001e /* Get TSO enable (ethtool_value) */
 #define ETHTOOL_STSO           0x0000001f /* Set TSO enable (ethtool_value) */
+#define ETHTOOL_GUSO           0x00000020 /* Get USO enable (ethtool_value) */
+#define ETHTOOL_SUSO           0x00000021 /* Set USO enable (ethtool_value) */
 
 /* compatibility with older code */
 #define SPARC_ETH_GSET         ETHTOOL_GSET
diff -uNr ethtool-3/ethtool.c ethtool-3_uso/ethtool.c
--- ethtool-3/ethtool.c 2005-01-28 04:19:29.000000000 +0545
+++ ethtool-3_uso/ethtool.c     2005-06-02 23:06:52.000000000 +0545
@@ -119,6 +119,7 @@
  *             [ tx on|off ] \
  *             [ sg on|off ] \
  *             [ tso on|off ]
+ *             [ uso on|off ]
  *     ethtool -r DEVNAME
  *     ethtool -p DEVNAME [ %d ]
  *     ethtool -t DEVNAME [ online|offline ]
@@ -191,6 +192,7 @@
                "               [ tx on|off ] \\\n"
                "               [ sg on|off ] \\\n"
                "               [ tso on|off ]\n"
+               "               [ uso on|off ]\n"
                "       ethtool -r DEVNAME\n"
                "       ethtool -p DEVNAME [ %%d ]\n"
                "       ethtool -t DEVNAME [online|(offline)]\n"
@@ -236,6 +238,7 @@
 static int off_csum_tx_wanted = -1;
 static int off_sg_wanted = -1;
 static int off_tso_wanted = -1;
+static int off_uso_wanted = -1;
 
 static struct ethtool_pauseparam epause;
 static int gpause_changed = 0;
@@ -339,6 +342,7 @@
        { "tx", CMDL_BOOL, &off_csum_tx_wanted, NULL },
        { "sg", CMDL_BOOL, &off_sg_wanted, NULL },
        { "tso", CMDL_BOOL, &off_tso_wanted, NULL },
+       { "uso", CMDL_BOOL, &off_uso_wanted, NULL },
 };
 
 static struct cmdline_info cmdline_pause[] = {
@@ -1184,17 +1188,19 @@
        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 uso)
 {
        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 large send offload: %s\n",
                rx ? "on" : "off",
                tx ? "on" : "off",
                sg ? "on" : "off",
-               tso ? "on" : "off");
+               tso ? "on" : "off",
+               uso ? "on" : "off");
 
        return 0;
 }
@@ -1458,7 +1464,7 @@
 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, uso = 0;
 
        fprintf(stdout, "Offload parameters for %s:\n", devname);
 
@@ -1502,12 +1508,22 @@
                allfail = 0;
        }
 
+       eval.cmd = ETHTOOL_GUSO;
+       ifr->ifr_data = (caddr_t)&eval;
+       err = ioctl(fd, SIOCETHTOOL, ifr);
+       if (err)
+               perror("Cannot get device udp large send offload settings");
+       else {
+               uso = 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, uso);
 }
 
 static int do_soffload(int fd, struct ifreq *ifr)
@@ -1562,6 +1578,17 @@
                        return 88;
                }
        }
+       if (off_uso_wanted >= 0) {
+               changed = 1;
+               eval.cmd = ETHTOOL_SUSO;
+               eval.data = (off_uso_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");
        }