[PATCH] ethtool: Add ETHTOOL_RESET support via --reset command

[Scott Branden <scott.branden@broadcom.com>]

Add ETHTOOL_RESET support via --reset command.

ie.  ethtool --reset DEVNAME <flagname(s)>

flagnames currently match the ETH_RESET_xxx names:
mgmt,irq,dma,filter,offload,mac,phy,ram,dedicated,all

Alternatively, you can specific component bitfield directly using
ethtool --reset DEVNAME flags %x

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 ethtool.8.in | 55 ++++++++++++++++++++++++++++++++++++++++++++-
 ethtool.c    | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 127 insertions(+), 1 deletion(-)

diff --git a/ethtool.8.in b/ethtool.8.in
index 6ad3065..925cfe3 100644
--- a/ethtool.8.in
+++ b/ethtool.8.in
@@ -355,6 +355,20 @@ ethtool \- query or control network driver and hardware settings
 .B ethtool \-\-get\-phy\-tunable
 .I devname
 .RB [ downshift ]
+.HP
+.B ethtool \-\-reset
+.I devname
+.BN flags
+.B [mgmt]
+.B [irq]
+.B [dma]
+.B [filter]
+.B [offload]
+.B [mac]
+.B [phy]
+.B [ram]
+.B [dedicated]
+.B [all]
 .
 .\" Adjust lines (i.e. full justification) and hyphenate.
 .ad
@@ -1007,6 +1021,44 @@ Downshift is useful where cable does not have the 4 pairs instance.
 
 Gets the PHY downshift count/status.
 .RE
+.TP
+.B \-\-reset
+Reset hardware components specified by flags and components listed below
+.RS 4
+.TP
+.BI flags \ N
+Resets the components based on direct flags mask
+.TP
+.B mgmt
+Management processor
+.TP
+.B irq
+Interrupt requester
+.TP
+.B dma
+DMA engine
+.TP
+.B filter
+Filtering/flow direction
+.TP
+.B offload
+Protocol offload
+.TP
+.B mac
+Media access controller
+.TP
+.B phy
+Transceiver/PHY
+.TP
+.B ram
+RAM shared between multiple components
+.TP
+.B dedicated
+All components dedicated to this interface
+.TP
+.B all
+All components used by this interface, even if shared
+.RE
 .SH BUGS
 Not supported (in part or whole) on all network drivers.
 .SH AUTHOR
@@ -1024,7 +1076,8 @@ Andi Kleen,
 Alexander Duyck,
 Sucheta Chakraborty,
 Jesse Brandeburg,
-Ben Hutchings.
+Ben Hutchings,
+Scott Branden.
 .SH AVAILABILITY
 .B ethtool
 is available from
diff --git a/ethtool.c b/ethtool.c
index 1a2b7cc..8c9d169 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -4641,6 +4641,67 @@ static int do_get_phy_tunable(struct cmd_context *ctx)
 	return err;
 }
 
+static int do_reset(struct cmd_context *ctx)
+{
+	struct ethtool_value resetinfo;
+	int argc = ctx->argc;
+	char **argp = ctx->argp;
+	int i;
+
+	if (argc == 0)
+		exit_bad_args();
+
+	resetinfo.data = 0;
+
+	for (i = 0; i < argc; i++) {
+		if (!strcmp(argp[i], "flags")) {
+			__u32 flags;
+
+			i++;
+			if (i >= argc)
+				exit_bad_args();
+			flags = strtoul(argp[i], NULL, 0);
+			if (flags == 0)
+				exit_bad_args();
+			else
+				resetinfo.data |= flags;
+		} else if (!strcmp(argp[i], "mgmt")) {
+			resetinfo.data |= ETH_RESET_MGMT;
+		} else if (!strcmp(argp[i], "irq")) {
+			resetinfo.data |= ETH_RESET_IRQ;
+		} else if (!strcmp(argp[i], "dma")) {
+			resetinfo.data |= ETH_RESET_DMA;
+		} else if (!strcmp(argp[i], "filter")) {
+			resetinfo.data |= ETH_RESET_FILTER;
+		} else if (!strcmp(argp[i], "offload")) {
+			resetinfo.data |= ETH_RESET_OFFLOAD;
+		} else if (!strcmp(argp[i], "mac")) {
+			resetinfo.data |= ETH_RESET_MAC;
+		} else if (!strcmp(argp[i], "phy")) {
+			resetinfo.data |= ETH_RESET_PHY;
+		} else if (!strcmp(argp[i], "ram")) {
+			resetinfo.data |= ETH_RESET_RAM;
+		} else if (!strcmp(argp[i], "dedicated")) {
+			resetinfo.data |= ETH_RESET_DEDICATED;
+		} else if (!strcmp(argp[i], "all")) {
+			resetinfo.data |= ETH_RESET_ALL;
+		} else {
+			exit_bad_args();
+		}
+	}
+
+	resetinfo.cmd = ETHTOOL_RESET;
+
+	if (send_ioctl(ctx, &resetinfo)) {
+		perror("Cannot issue RESET");
+		return 1;
+	} else {
+		fprintf(stdout, "RESET 0x%x issued\n", resetinfo.data);
+	}
+
+	return 0;
+}
+
 static int parse_named_bool(struct cmd_context *ctx, const char *name, u8 *on)
 {
 	if (ctx->argc < 2)
@@ -4904,6 +4965,18 @@ static const struct option {
 	  "		[ downshift on|off [count N] ]\n"},
 	{ "--get-phy-tunable", 1, do_get_phy_tunable, "Get PHY tunable",
 	  "		[ downshift ]\n"},
+	{ "--reset", 1, do_reset, "Reset components",
+	  "		[ flags %x ]\n"
+	  "		[ mgmt ]\n"
+	  "		[ irq ]\n"
+	  "		[ dma ]\n"
+	  "		[ filter ]\n"
+	  "		[ offload ]\n"
+	  "		[ mac ]\n"
+	  "		[ phy ]\n"
+	  "		[ ram ]\n"
+	  "		[ dedicated ]\n"
+	  "		[ all ]\n"},
 	{ "-h|--help", 0, show_usage, "Show this help" },
 	{ "--version", 0, do_version, "Show version number" },
 	{}
-- 
2.5.0