[PATCH 5/6] cmd: net: add a 'net stats' command to dump network statistics

[Ioana Ciornei]

Add a new option to the 'net' command which can be used to dump network
statistics.

To do this, 3 new callbacks are added to the eth_ops structure:
.get_sset_count(), .get_strings(), .get_stats(). These callbacks
have the same functions as in Linux: to return the number of counters,
the strings which describe those counters and the actual values.

Signed-off-by: Ioana Ciornei <ioana.ciornei at nxp.com>
---
 cmd/net.c     | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 include/net.h |  6 ++++++
 2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/cmd/net.c b/cmd/net.c
index 68d406291ef1..dfe811f41acf 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -13,6 +13,7 @@
 #include <bootstage.h>
 #include <command.h>
 #include <dm.h>
+#include <dm/devres.h>
 #include <env.h>
 #include <image.h>
 #include <log.h>
@@ -691,8 +692,58 @@ static int do_net_list(struct cmd_tbl *cmdtp, int flag, int argc, char *const ar
 	return CMD_RET_SUCCESS;
 }
 
+static int do_net_stats(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	int nstats, err, i, off;
+	struct udevice *dev;
+	u64 *values;
+	u8 *strings;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	err = uclass_get_device_by_name(UCLASS_ETH, argv[1], &dev);
+	if (err) {
+		printf("Could not find device %s\n", argv[1]);
+		return CMD_RET_FAILURE;
+	}
+
+	if (!eth_get_ops(dev)->get_sset_count ||
+	    !eth_get_ops(dev)->get_strings ||
+	    !eth_get_ops(dev)->get_stats) {
+		printf("Driver does not implement stats dump!\n");
+		return CMD_RET_FAILURE;
+	}
+
+	nstats = eth_get_ops(dev)->get_sset_count(dev);
+	strings = kcalloc(nstats, ETH_GSTRING_LEN, GFP_KERNEL);
+	if (!strings)
+		return CMD_RET_FAILURE;
+
+	values = kcalloc(nstats, sizeof(u64), GFP_KERNEL);
+	if (!values)
+		goto err_free_strings;
+
+	eth_get_ops(dev)->get_strings(dev, strings);
+	eth_get_ops(dev)->get_stats(dev, values);
+
+	off = 0;
+	for (i = 0; i < nstats; i++) {
+		printf("  %s: %llu\n", &strings[off], values[i]);
+		off += ETH_GSTRING_LEN;
+	};
+
+	return CMD_RET_SUCCESS;
+
+err_free_strings:
+	kfree(strings);
+
+	return CMD_RET_FAILURE;
+}
+
 static struct cmd_tbl cmd_net[] = {
 	U_BOOT_CMD_MKENT(list, 1, 0, do_net_list, "", ""),
+	U_BOOT_CMD_MKENT(stats, 2, 0, do_net_stats, "", ""),
 };
 
 static int do_net(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
@@ -714,9 +765,10 @@ static int do_net(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 }
 
 U_BOOT_CMD(
-	net, 2, 1, do_net,
+	net, 3, 1, do_net,
 	"NET sub-system",
 	"list - list available devices\n"
+	"stats <device> - dump statistics for specified device\n"
 );
 
 #if defined(CONFIG_CMD_NCSI)
diff --git a/include/net.h b/include/net.h
index 785cb1059ef9..e254df7d7f43 100644
--- a/include/net.h
+++ b/include/net.h
@@ -167,6 +167,9 @@ enum eth_recv_flags {
  *		    to the network stack. This function should fill in the
  *		    eth_pdata::enetaddr field - optional
  * set_promisc: Enable or Disable promiscuous mode
+ * get_sset_count: Number of statistics counters
+ * get_string: Names of the statistic counters
+ * get_stats: The values of the statistic counters
  */
 struct eth_ops {
 	int (*start)(struct udevice *dev);
@@ -178,6 +181,9 @@ struct eth_ops {
 	int (*write_hwaddr)(struct udevice *dev);
 	int (*read_rom_hwaddr)(struct udevice *dev);
 	int (*set_promisc)(struct udevice *dev, bool enable);
+	int (*get_sset_count)(struct udevice *dev);
+	void (*get_strings)(struct udevice *dev, u8 *data);
+	void (*get_stats)(struct udevice *dev, u64 *data);
 };
 
 #define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)
-- 
2.25.1