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

[Egil Hjelmeland]

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@xxxxxxxxxxx>
---
 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


DISCLAIMER:
This e-mail may contain confidential and privileged material for the sole use of the intended recipient. Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply e-mail and delete all copies of this message.