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Date: Fri, 18 Jan 2008 11:01:27 +0000
From: Ben Hutchings <bhutchings@...arflare.com>
To: netdev@...r.kernel.org
Subject: [PATCH] Add LRO control to ethtool
The kernel-side ethtool code supports ETHTOOL_{G,S}FLAGS commands
which can control various features; currently the only feature is LRO.
I didn't see any code to use these in the ethtool git repository
<git://git.kernel.org/pub/scm/network/ethtool/ethtool.git>. So here's
a patch that adds that. I tested this with the latest version of the
sfc driver, which we should be re-posting later today.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
diff --git a/ethtool.c b/ethtool.c
index 3adf843..cfe7c9f 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -151,7 +151,8 @@ static struct option {
" [ sg on|off ]\n"
" [ tso on|off ]\n"
" [ ufo on|off ]\n"
- " [ gso on|off ]\n" },
+ " [ gso on|off ]\n"
+ " [ lro on|off ]\n" },
{ "-i", "--driver", MODE_GDRV, "Show driver information" },
{ "-d", "--register-dump", MODE_GREGS, "Do a register dump",
" [ raw on|off ]\n"
@@ -200,6 +201,7 @@ static int off_sg_wanted = -1;
static int off_tso_wanted = -1;
static int off_ufo_wanted = -1;
static int off_gso_wanted = -1;
+static int off_lro_wanted = -1;
static struct ethtool_pauseparam epause;
static int gpause_changed = 0;
@@ -310,6 +312,7 @@ static struct cmdline_info cmdline_offload[] = {
{ "tso", CMDL_BOOL, &off_tso_wanted, NULL },
{ "ufo", CMDL_BOOL, &off_ufo_wanted, NULL },
{ "gso", CMDL_BOOL, &off_gso_wanted, NULL },
+ { "lro", CMDL_BOOL, &off_lro_wanted, NULL },
};
static struct cmdline_info cmdline_pause[] = {
@@ -1217,7 +1220,8 @@ static int dump_coalesce(void)
return 0;
}
-static int dump_offload (int rx, int tx, int sg, int tso, int ufo, int gso)
+static int dump_offload (int rx, int tx, int sg, int tso, int ufo, int gso,
+ int lro)
{
fprintf(stdout,
"rx-checksumming: %s\n"
@@ -1225,13 +1229,15 @@ static int dump_offload (int rx, int tx, int sg, int tso, int ufo, int gso)
"scatter-gather: %s\n"
"tcp segmentation offload: %s\n"
"udp fragmentation offload: %s\n"
- "generic segmentation offload: %s\n",
+ "generic segmentation offload: %s\n"
+ "large receive offload: %s\n",
rx ? "on" : "off",
tx ? "on" : "off",
sg ? "on" : "off",
tso ? "on" : "off",
ufo ? "on" : "off",
- gso ? "on" : "off");
+ gso ? "on" : "off",
+ lro ? "on" : "off");
return 0;
}
@@ -1495,7 +1501,8 @@ 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, ufo = 0, gso = 0;
+ int err, allfail = 1;
+ int rx = 0, tx = 0, sg = 0, tso = 0, ufo = 0, gso = 0, lro = 0;
fprintf(stdout, "Offload parameters for %s:\n", devname);
@@ -1559,12 +1566,22 @@ static int do_goffload(int fd, struct ifreq *ifr)
allfail = 0;
}
+ eval.cmd = ETHTOOL_GFLAGS;
+ ifr->ifr_data = (caddr_t)&eval;
+ err = ioctl(fd, SIOCETHTOOL, ifr);
+ if (err)
+ perror("Cannot get device large receive offload settings");
+ else {
+ lro = (eval.data & ETH_FLAG_LRO) != 0;
+ allfail = 0;
+ }
+
if (allfail) {
fprintf(stdout, "no offload info available\n");
return 83;
}
- return dump_offload(rx, tx, sg, tso, ufo, gso);
+ return dump_offload(rx, tx, sg, tso, ufo, gso, lro);
}
static int do_soffload(int fd, struct ifreq *ifr)
@@ -1641,6 +1658,17 @@ static int do_soffload(int fd, struct ifreq *ifr)
return 90;
}
}
+ if (off_lro_wanted >= 0) {
+ changed = 1;
+ eval.cmd = ETHTOOL_SFLAGS;
+ eval.data = (off_lro_wanted == 1) ? ETH_FLAG_LRO : 0;
+ ifr->ifr_data = (caddr_t)&eval;
+ err = ioctl(fd, SIOCETHTOOL, ifr);
+ if (err) {
+ perror("Cannot set device large receive offload settings");
+ return 91;
+ }
+ }
if (!changed) {
fprintf(stdout, "no offload settings changed\n");
}
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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