[PATCH 11/13] net: dsa: lan9303: Added "alr_dump" sysfs port attribute

[Egil Hjelmeland <egil.hjelmeland@zenitel.com>]

Added read only file /sys/class/net/<port>/lan9303/alr_dump,
that output 168 first ALR entires.

Currently "bridge fdb show" does not include the CPU port, while
"alr_dump" list all three ports per entry.

Example output:

9c:57:ad:79:d0:84  1  l
01:80:c2:00:00:00 0   s
00:13:cb:0d:01:95 0   s
10:f3:11:f5:6f:cf   2 l
48:4d:7e:f4:59:a8   2 l
01:00:5e:00:01:0a 0 2 s
ec:f4:bb:0f:e2:fd   2 l

Signed-off-by: Egil Hjelmeland <egil.hjelmeland@zenitel.com>
---
 Documentation/networking/dsa/lan9303.txt |  3 ++
 drivers/net/dsa/lan9303-core.c           | 58 ++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/Documentation/networking/dsa/lan9303.txt b/Documentation/networking/dsa/lan9303.txt
index 1fd72ff4b492..ace91c821ce7 100644
--- a/Documentation/networking/dsa/lan9303.txt
+++ b/Documentation/networking/dsa/lan9303.txt
@@ -37,6 +37,9 @@ Sysfs nodes
 When a user port is enabled, the driver creates sysfs directory
 /sys/class/net/xxx/lan9303 with the following files:
 
+ - alr_dump (RO): List the 168 first entries of the ALR table.
+      Including port 0 entires. This file is identical for both ports.
+      Format: MAC; list of ports; (l)earned / (s)tatic
  - swe_bcst_throt (RW): Set/get 6.4.7 Broadcast Storm Control
       Throttle Level for the port. Accesses the corresponding bits of
       the SWE_BCST_THROT register (13.4.3.23).
diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index ad7a4c72e1fb..b682aa4f1fca 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -642,6 +642,47 @@ static void alr_loop_cb_fdb_port_dump(
 	dump_ctx->cb(&fdb->obj);
 }
 
+/* /sys/class/net/xxx/lan9303/alr_dump: display 168 first ALR entires,
+ * including cpu port
+ */
+struct port_sysfs_dump_ctx {
+	char *buf;
+	int pos;
+};
+
+static void alr_loop_cb_sysfs_dump(
+	struct lan9303 *chip, u32 dat0, u32 dat1, int portmap, void *ctx)
+{
+#	define LINE_LEN 24
+	struct port_sysfs_dump_ctx *dump_ctx = ctx;
+	char *buf = dump_ctx->buf;
+	int  pos =  dump_ctx->pos;
+
+	u8 mac[ETH_ALEN];
+	int p;
+	char ports[LAN9303_NUM_PORTS + 1];
+	const char trunc_txt[] = "Truncated!\n";
+
+	if (pos >= PAGE_SIZE - LINE_LEN - (sizeof(trunc_txt) - 1)) {
+		if (pos < PAGE_SIZE - LINE_LEN)
+			pos += sprintf(buf + pos, trunc_txt);
+		dump_ctx->pos = pos;
+		return;
+	}
+
+	_alr_reg_to_mac(dat0, dat1, mac);
+
+	/* print ports as list of port numbers: */
+	for (p = 0; p < LAN9303_NUM_PORTS; p++)
+		ports[p] = (portmap & BIT(p)) ? '0' + p : ' ';
+	ports[LAN9303_NUM_PORTS] = 0;
+
+	pos += sprintf(buf + pos, "%pM %s %s\n",
+	       mac, ports,
+	       (dat1 & ALR_DAT1_STATIC) ? "s" : "l");
+	dump_ctx->pos = pos;
+}
+
 /* ALR: Add/modify/delete ALR entries */
 
 /* Set a static ALR entry. Delete entry if port_map is zero */
@@ -931,8 +972,25 @@ swe_bcst_throt_store(struct device *dev, struct device_attribute *attr,
 
 static DEVICE_ATTR_RW(swe_bcst_throt);
 
+static ssize_t
+alr_dump_show(struct device *dev, struct device_attribute *attr,
+	      char *buf)
+{
+	struct dsa_port *dp = dsa_net_device_to_dsa_port(to_net_dev(dev));
+	struct lan9303 *chip = dp->ds->priv;
+	struct port_sysfs_dump_ctx dump_ctx = {
+		.buf = buf,
+		.pos = 0,
+	};
+
+	lan9303_alr_loop(chip, alr_loop_cb_sysfs_dump, &dump_ctx);
+	return dump_ctx.pos;
+}
+static DEVICE_ATTR_RO(alr_dump);
+
 static struct attribute *lan9303_attrs[] = {
 	&dev_attr_swe_bcst_throt.attr,
+	&dev_attr_alr_dump.attr,
 	NULL
 };
 
-- 
2.11.0


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