mt76: mt7615: add debugfs knob for setting extended local mac addresses

This is primarily for testing and can be used in combination with monitor
mode to make the card respond to packets sent to a specific MAC address.
For now this is only exposed as a debug/testing feature, later on the
approach might be used to support more concurrent station interfaces

Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 88 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c
index 00ba550fc48f..b8c31b57734d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c
@@ -365,6 +365,93 @@ mt7615_rf_reg_get(void *data, u64 *val)
 DEFINE_DEBUGFS_ATTRIBUTE(fops_rf_reg, mt7615_rf_reg_get, mt7615_rf_reg_set,
 			 "0x%08llx\n");
 
+static ssize_t
+mt7615_ext_mac_addr_read(struct file *file, char __user *userbuf,
+			 size_t count, loff_t *ppos)
+{
+	struct mt7615_dev *dev = file->private_data;
+	char buf[32 * ((ETH_ALEN * 3) + 4) + 1];
+	u8 addr[ETH_ALEN];
+	int ofs = 0;
+	int i;
+
+	for (i = 0; i < 32; i++) {
+		if (!(dev->muar_mask & BIT(i)))
+			continue;
+
+		mt76_wr(dev, MT_WF_RMAC_MAR1,
+			FIELD_PREP(MT_WF_RMAC_MAR1_IDX, i * 2) |
+			MT_WF_RMAC_MAR1_START);
+		put_unaligned_le32(mt76_rr(dev, MT_WF_RMAC_MAR0), addr);
+		put_unaligned_le16((mt76_rr(dev, MT_WF_RMAC_MAR1) &
+				    MT_WF_RMAC_MAR1_ADDR), addr + 4);
+		ofs += snprintf(buf + ofs, sizeof(buf) - ofs, "%d=%pM\n", i, addr);
+	}
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, ofs);
+}
+
+static ssize_t
+mt7615_ext_mac_addr_write(struct file *file, const char __user *userbuf,
+			  size_t count, loff_t *ppos)
+{
+	struct mt7615_dev *dev = file->private_data;
+	unsigned long idx = 0;
+	u8 addr[ETH_ALEN];
+	char buf[32];
+	char *p;
+
+	if (count > sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(buf, userbuf, count))
+		return -EFAULT;
+
+	buf[sizeof(buf) - 1] = '\0';
+
+	p = strchr(buf, '=');
+	if (p) {
+		*p = 0;
+		p++;
+
+		if (kstrtoul(buf, 0, &idx) || idx > 31)
+			return -EINVAL;
+	} else {
+		idx = 0;
+		p = buf;
+	}
+
+	if (!mac_pton(p, addr))
+		return -EINVAL;
+
+	if (is_valid_ether_addr(addr)) {
+		dev->muar_mask |= BIT(idx);
+	} else {
+		memset(addr, 0, sizeof(addr));
+		dev->muar_mask &= ~BIT(idx);
+	}
+
+	mt76_rmw_field(dev, MT_WF_RMAC_MORE(0), MT_WF_RMAC_MORE_MUAR_MODE, 1);
+	mt76_wr(dev, MT_WF_RMAC_MAR0, get_unaligned_le32(addr));
+	mt76_wr(dev, MT_WF_RMAC_MAR1,
+		get_unaligned_le16(addr + 4) |
+		FIELD_PREP(MT_WF_RMAC_MAR1_IDX, idx * 2) |
+		MT_WF_RMAC_MAR1_START |
+		MT_WF_RMAC_MAR1_WRITE);
+
+	mt76_rmw_field(dev, MT_WF_RMAC_MORE(0), MT_WF_RMAC_MORE_MUAR_MODE, !!dev->muar_mask);
+
+	return count;
+}
+
+static const struct file_operations fops_ext_mac_addr = {
+	.open = simple_open,
+	.llseek = generic_file_llseek,
+	.read = mt7615_ext_mac_addr_read,
+	.write = mt7615_ext_mac_addr_write,
+	.owner = THIS_MODULE,
+};
+
 int mt7615_init_debugfs(struct mt7615_dev *dev)
 {
 	struct dentry *dir;
@@ -406,6 +493,7 @@ int mt7615_init_debugfs(struct mt7615_dev *dev)
 			    &fops_reset_test);
 	debugfs_create_devm_seqfile(dev->mt76.dev, "temperature", dir,
 				    mt7615_read_temperature);
+	debugfs_create_file("ext_mac_addr", 0600, dir, dev, &fops_ext_mac_addr);
 
 	debugfs_create_u32("rf_wfidx", 0600, dir, &dev->debugfs_rf_wf);
 	debugfs_create_u32("rf_regidx", 0600, dir, &dev->debugfs_rf_reg);