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ddcebda08b
Add kernel tag that introduced the patch on backport patch. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
227 lines
6.5 KiB
Diff
227 lines
6.5 KiB
Diff
From 5c957c7ca78cce5e4b96866722b0115bd758d945 Mon Sep 17 00:00:00 2001
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From: Ansuel Smith <ansuelsmth@gmail.com>
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Date: Wed, 2 Feb 2022 01:03:30 +0100
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Subject: [PATCH 11/16] net: dsa: qca8k: add support for mib autocast in
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Ethernet packet
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The switch can autocast MIB counter using Ethernet packet.
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Add support for this and provide a handler for the tagger.
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The switch will send packet with MIB counter for each port, the switch
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will use completion API to wait for the correct packet to be received
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and will complete the task only when each packet is received.
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Although the handler will drop all the other packet, we still have to
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consume each MIB packet to complete the request. This is done to prevent
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mixed data with concurrent ethtool request.
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connect_tag_protocol() is used to add the handler to the tag_qca tagger,
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master_state_change() use the MIB lock to make sure no MIB Ethernet is
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in progress.
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/dsa/qca8k.c | 106 +++++++++++++++++++++++++++++++++++++++-
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drivers/net/dsa/qca8k.h | 17 ++++++-
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2 files changed, 121 insertions(+), 2 deletions(-)
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--- a/drivers/net/dsa/qca8k.c
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+++ b/drivers/net/dsa/qca8k.c
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@@ -830,7 +830,10 @@ qca8k_mib_init(struct qca8k_priv *priv)
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int ret;
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mutex_lock(&priv->reg_mutex);
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- ret = regmap_set_bits(priv->regmap, QCA8K_REG_MIB, QCA8K_MIB_FLUSH | QCA8K_MIB_BUSY);
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+ ret = regmap_update_bits(priv->regmap, QCA8K_REG_MIB,
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+ QCA8K_MIB_FUNC | QCA8K_MIB_BUSY,
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+ FIELD_PREP(QCA8K_MIB_FUNC, QCA8K_MIB_FLUSH) |
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+ QCA8K_MIB_BUSY);
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if (ret)
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goto exit;
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@@ -1901,6 +1904,97 @@ qca8k_get_strings(struct dsa_switch *ds,
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ETH_GSTRING_LEN);
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}
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+static void qca8k_mib_autocast_handler(struct dsa_switch *ds, struct sk_buff *skb)
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+{
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+ const struct qca8k_match_data *match_data;
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+ struct qca8k_mib_eth_data *mib_eth_data;
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+ struct qca8k_priv *priv = ds->priv;
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+ const struct qca8k_mib_desc *mib;
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+ struct mib_ethhdr *mib_ethhdr;
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+ int i, mib_len, offset = 0;
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+ u64 *data;
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+ u8 port;
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+
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+ mib_ethhdr = (struct mib_ethhdr *)skb_mac_header(skb);
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+ mib_eth_data = &priv->mib_eth_data;
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+
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+ /* The switch autocast every port. Ignore other packet and
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+ * parse only the requested one.
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+ */
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+ port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, ntohs(mib_ethhdr->hdr));
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+ if (port != mib_eth_data->req_port)
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+ goto exit;
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+
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+ match_data = device_get_match_data(priv->dev);
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+ data = mib_eth_data->data;
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+
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+ for (i = 0; i < match_data->mib_count; i++) {
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+ mib = &ar8327_mib[i];
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+
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+ /* First 3 mib are present in the skb head */
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+ if (i < 3) {
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+ data[i] = mib_ethhdr->data[i];
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+ continue;
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+ }
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+
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+ mib_len = sizeof(uint32_t);
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+
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+ /* Some mib are 64 bit wide */
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+ if (mib->size == 2)
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+ mib_len = sizeof(uint64_t);
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+
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+ /* Copy the mib value from packet to the */
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+ memcpy(data + i, skb->data + offset, mib_len);
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+
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+ /* Set the offset for the next mib */
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+ offset += mib_len;
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+ }
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+
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+exit:
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+ /* Complete on receiving all the mib packet */
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+ if (refcount_dec_and_test(&mib_eth_data->port_parsed))
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+ complete(&mib_eth_data->rw_done);
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+}
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+
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+static int
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+qca8k_get_ethtool_stats_eth(struct dsa_switch *ds, int port, u64 *data)
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+{
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+ struct dsa_port *dp = dsa_to_port(ds, port);
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+ struct qca8k_mib_eth_data *mib_eth_data;
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+ struct qca8k_priv *priv = ds->priv;
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+ int ret;
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+
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+ mib_eth_data = &priv->mib_eth_data;
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+
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+ mutex_lock(&mib_eth_data->mutex);
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+
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+ reinit_completion(&mib_eth_data->rw_done);
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+
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+ mib_eth_data->req_port = dp->index;
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+ mib_eth_data->data = data;
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+ refcount_set(&mib_eth_data->port_parsed, QCA8K_NUM_PORTS);
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+
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+ mutex_lock(&priv->reg_mutex);
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+
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+ /* Send mib autocast request */
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+ ret = regmap_update_bits(priv->regmap, QCA8K_REG_MIB,
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+ QCA8K_MIB_FUNC | QCA8K_MIB_BUSY,
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+ FIELD_PREP(QCA8K_MIB_FUNC, QCA8K_MIB_CAST) |
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+ QCA8K_MIB_BUSY);
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+
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+ mutex_unlock(&priv->reg_mutex);
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+
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+ if (ret)
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+ goto exit;
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+
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+ ret = wait_for_completion_timeout(&mib_eth_data->rw_done, QCA8K_ETHERNET_TIMEOUT);
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+
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+exit:
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+ mutex_unlock(&mib_eth_data->mutex);
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+
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+ return ret;
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+}
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+
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static void
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qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
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uint64_t *data)
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@@ -1912,6 +2006,10 @@ qca8k_get_ethtool_stats(struct dsa_switc
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u32 hi = 0;
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int ret;
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+ if (priv->mgmt_master &&
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+ qca8k_get_ethtool_stats_eth(ds, port, data) > 0)
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+ return;
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+
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match_data = of_device_get_match_data(priv->dev);
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for (i = 0; i < match_data->mib_count; i++) {
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@@ -2611,9 +2709,11 @@ qca8k_master_change(struct dsa_switch *d
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return;
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mutex_lock(&priv->mgmt_eth_data.mutex);
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+ mutex_lock(&priv->mib_eth_data.mutex);
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priv->mgmt_master = operational ? (struct net_device *)master : NULL;
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+ mutex_unlock(&priv->mib_eth_data.mutex);
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mutex_unlock(&priv->mgmt_eth_data.mutex);
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}
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@@ -2627,6 +2727,7 @@ static int qca8k_connect_tag_protocol(st
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tagger_data = ds->tagger_data;
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tagger_data->rw_reg_ack_handler = qca8k_rw_reg_ack_handler;
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+ tagger_data->mib_autocast_handler = qca8k_mib_autocast_handler;
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break;
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default:
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@@ -2755,6 +2856,9 @@ qca8k_sw_probe(struct mdio_device *mdiod
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mutex_init(&priv->mgmt_eth_data.mutex);
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init_completion(&priv->mgmt_eth_data.rw_done);
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+ mutex_init(&priv->mib_eth_data.mutex);
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+ init_completion(&priv->mib_eth_data.rw_done);
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+
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priv->ds->dev = &mdiodev->dev;
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priv->ds->num_ports = QCA8K_NUM_PORTS;
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priv->ds->priv = priv;
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--- a/drivers/net/dsa/qca8k.h
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+++ b/drivers/net/dsa/qca8k.h
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@@ -67,7 +67,7 @@
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#define QCA8K_REG_MODULE_EN 0x030
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#define QCA8K_MODULE_EN_MIB BIT(0)
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#define QCA8K_REG_MIB 0x034
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-#define QCA8K_MIB_FLUSH BIT(24)
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+#define QCA8K_MIB_FUNC GENMASK(26, 24)
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#define QCA8K_MIB_CPU_KEEP BIT(20)
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#define QCA8K_MIB_BUSY BIT(17)
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#define QCA8K_MDIO_MASTER_CTRL 0x3c
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@@ -317,6 +317,12 @@ enum qca8k_vlan_cmd {
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QCA8K_VLAN_READ = 6,
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};
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+enum qca8k_mid_cmd {
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+ QCA8K_MIB_FLUSH = 1,
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+ QCA8K_MIB_FLUSH_PORT = 2,
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+ QCA8K_MIB_CAST = 3,
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+};
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+
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struct ar8xxx_port_status {
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int enabled;
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};
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@@ -340,6 +346,14 @@ struct qca8k_mgmt_eth_data {
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u32 data[4];
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};
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+struct qca8k_mib_eth_data {
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+ struct completion rw_done;
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+ struct mutex mutex; /* Process one command at time */
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+ refcount_t port_parsed; /* Counter to track parsed port */
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+ u8 req_port;
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+ u64 *data; /* pointer to ethtool data */
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+};
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+
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struct qca8k_ports_config {
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bool sgmii_rx_clk_falling_edge;
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bool sgmii_tx_clk_falling_edge;
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@@ -367,6 +381,7 @@ struct qca8k_priv {
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unsigned int port_mtu[QCA8K_NUM_PORTS];
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struct net_device *mgmt_master; /* Track if mdio/mib Ethernet is available */
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struct qca8k_mgmt_eth_data mgmt_eth_data;
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+ struct qca8k_mib_eth_data mib_eth_data;
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};
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struct qca8k_mib_desc {
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