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Date:   Fri, 15 May 2020 19:52:56 +0300
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     Ioana Radulescu <ruxandra.radulescu@....com>,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH net-next 3/7] dpaa2-eth: Distribute ingress frames based on VLAN prio

From: Ioana Radulescu <ruxandra.radulescu@....com>

Configure static ingress classification based on VLAN PCP field.
If the DPNI doesn't have enough traffic classes to accommodate all
priority levels, the lowest ones end up on TC 0 (default on miss).

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@....com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.c  | 116 ++++++++++++++++
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.h  |   1 +
 .../net/ethernet/freescale/dpaa2/dpni-cmd.h   |  34 +++++
 drivers/net/ethernet/freescale/dpaa2/dpni.c   | 131 ++++++++++++++++++
 drivers/net/ethernet/freescale/dpaa2/dpni.h   |  36 +++++
 5 files changed, 318 insertions(+)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index a8baf13063ae..cb6e6f7b8330 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -2689,6 +2689,118 @@ static void update_tx_fqids(struct dpaa2_eth_priv *priv)
 	priv->enqueue = dpaa2_eth_enqueue_qd;
 }
 
+/* Configure ingress classification based on VLAN PCP */
+static int set_vlan_qos(struct dpaa2_eth_priv *priv)
+{
+	struct device *dev = priv->net_dev->dev.parent;
+	struct dpkg_profile_cfg kg_cfg = {0};
+	struct dpni_qos_tbl_cfg qos_cfg = {0};
+	struct dpni_rule_cfg key_params;
+	void *dma_mem, *key, *mask;
+	u8 key_size = 2;	/* VLAN TCI field */
+	int i, pcp, err;
+
+	/* VLAN-based classification only makes sense if we have multiple
+	 * traffic classes.
+	 * Also, we need to extract just the 3-bit PCP field from the VLAN
+	 * header and we can only do that by using a mask
+	 */
+	if (dpaa2_eth_tc_count(priv) == 1 || !dpaa2_eth_fs_mask_enabled(priv)) {
+		dev_dbg(dev, "VLAN-based QoS classification not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	dma_mem = kzalloc(DPAA2_CLASSIFIER_DMA_SIZE, GFP_KERNEL);
+	if (!dma_mem)
+		return -ENOMEM;
+
+	kg_cfg.num_extracts = 1;
+	kg_cfg.extracts[0].type = DPKG_EXTRACT_FROM_HDR;
+	kg_cfg.extracts[0].extract.from_hdr.prot = NET_PROT_VLAN;
+	kg_cfg.extracts[0].extract.from_hdr.type = DPKG_FULL_FIELD;
+	kg_cfg.extracts[0].extract.from_hdr.field = NH_FLD_VLAN_TCI;
+
+	err =  dpni_prepare_key_cfg(&kg_cfg, dma_mem);
+	if (err) {
+		dev_err(dev, "dpni_prepare_key_cfg failed\n");
+		goto out_free_tbl;
+	}
+
+	/* set QoS table */
+	qos_cfg.default_tc = 0;
+	qos_cfg.discard_on_miss = 0;
+	qos_cfg.key_cfg_iova = dma_map_single(dev, dma_mem,
+					      DPAA2_CLASSIFIER_DMA_SIZE,
+					      DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, qos_cfg.key_cfg_iova)) {
+		dev_err(dev, "QoS table DMA mapping failed\n");
+		err = -ENOMEM;
+		goto out_free_tbl;
+	}
+
+	err = dpni_set_qos_table(priv->mc_io, 0, priv->mc_token, &qos_cfg);
+	if (err) {
+		dev_err(dev, "dpni_set_qos_table failed\n");
+		goto out_unmap_tbl;
+	}
+
+	/* Add QoS table entries */
+	key = kzalloc(key_size * 2, GFP_KERNEL);
+	if (!key) {
+		err = -ENOMEM;
+		goto out_unmap_tbl;
+	}
+	mask = key + key_size;
+	*(u16 *)mask = cpu_to_be16(VLAN_PRIO_MASK);
+
+	key_params.key_iova = dma_map_single(dev, key, key_size * 2,
+					     DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, key_params.key_iova)) {
+		dev_err(dev, "Qos table entry DMA mapping failed\n");
+		err = -ENOMEM;
+		goto out_free_key;
+	}
+
+	key_params.mask_iova = key_params.key_iova + key_size;
+	key_params.key_size = key_size;
+
+	/* We add rules for PCP-based distribution starting with highest
+	 * priority (VLAN PCP = 7). If this DPNI doesn't have enough traffic
+	 * classes to accommodate all priority levels, the lowest ones end up
+	 * on TC 0 which was configured as default
+	 */
+	for (i = dpaa2_eth_tc_count(priv) - 1, pcp = 7; i >= 0; i--, pcp--) {
+		*(u16 *)key = cpu_to_be16(pcp << VLAN_PRIO_SHIFT);
+		dma_sync_single_for_device(dev, key_params.key_iova,
+					   key_size * 2, DMA_TO_DEVICE);
+
+		err = dpni_add_qos_entry(priv->mc_io, 0, priv->mc_token,
+					 &key_params, i, i);
+		if (err) {
+			dev_err(dev, "dpni_add_qos_entry failed\n");
+			dpni_clear_qos_table(priv->mc_io, 0, priv->mc_token);
+			goto out_unmap_key;
+		}
+	}
+
+	priv->vlan_cls_enabled = true;
+
+	/* Table and key memory is not persistent, clean everything up after
+	 * configuration is finished
+	 */
+out_unmap_key:
+	dma_unmap_single(dev, key_params.key_iova, key_size * 2, DMA_TO_DEVICE);
+out_free_key:
+	kfree(key);
+out_unmap_tbl:
+	dma_unmap_single(dev, qos_cfg.key_cfg_iova, DPAA2_CLASSIFIER_DMA_SIZE,
+			 DMA_TO_DEVICE);
+out_free_tbl:
+	kfree(dma_mem);
+
+	return err;
+}
+
 /* Configure the DPNI object this interface is associated with */
 static int setup_dpni(struct fsl_mc_device *ls_dev)
 {
@@ -2751,6 +2863,10 @@ static int setup_dpni(struct fsl_mc_device *ls_dev)
 			goto close;
 	}
 
+	err = set_vlan_qos(priv);
+	if (err && err != -EOPNOTSUPP)
+		goto close;
+
 	priv->cls_rules = devm_kzalloc(dev, sizeof(struct dpaa2_eth_cls_rule) *
 				       dpaa2_eth_fs_count(priv), GFP_KERNEL);
 	if (!priv->cls_rules) {
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
index 580ad5fd7bd8..7856f69bcf36 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
@@ -427,6 +427,7 @@ struct dpaa2_eth_priv {
 	u64 rx_cls_fields;
 	struct dpaa2_eth_cls_rule *cls_rules;
 	u8 rx_cls_enabled;
+	u8 vlan_cls_enabled;
 	struct bpf_prog *xdp_prog;
 #ifdef CONFIG_DEBUG_FS
 	struct dpaa2_debugfs dbg;
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpni-cmd.h b/drivers/net/ethernet/freescale/dpaa2/dpni-cmd.h
index d9b6918807af..0048e856f85e 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpni-cmd.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpni-cmd.h
@@ -59,6 +59,10 @@
 
 #define DPNI_CMDID_SET_RX_TC_DIST			DPNI_CMD(0x235)
 
+#define DPNI_CMDID_SET_QOS_TBL				DPNI_CMD(0x240)
+#define DPNI_CMDID_ADD_QOS_ENT				DPNI_CMD(0x241)
+#define DPNI_CMDID_REMOVE_QOS_ENT			DPNI_CMD(0x242)
+#define DPNI_CMDID_CLR_QOS_TBL				DPNI_CMD(0x243)
 #define DPNI_CMDID_ADD_FS_ENT				DPNI_CMD(0x244)
 #define DPNI_CMDID_REMOVE_FS_ENT			DPNI_CMD(0x245)
 #define DPNI_CMDID_CLR_FS_ENT				DPNI_CMD(0x246)
@@ -567,4 +571,34 @@ struct dpni_cmd_remove_fs_entry {
 	__le64 mask_iova;
 };
 
+#define DPNI_DISCARD_ON_MISS_SHIFT	0
+#define DPNI_DISCARD_ON_MISS_SIZE	1
+
+struct dpni_cmd_set_qos_table {
+	__le32 pad;
+	u8 default_tc;
+	/* only the LSB */
+	u8 discard_on_miss;
+	__le16 pad1[21];
+	__le64 key_cfg_iova;
+};
+
+struct dpni_cmd_add_qos_entry {
+	__le16 pad;
+	u8 tc_id;
+	u8 key_size;
+	__le16 index;
+	__le16 pad1;
+	__le64 key_iova;
+	__le64 mask_iova;
+};
+
+struct dpni_cmd_remove_qos_entry {
+	u8 pad[3];
+	u8 key_size;
+	__le32 pad1;
+	__le64 key_iova;
+	__le64 mask_iova;
+};
+
 #endif /* _FSL_DPNI_CMD_H */
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpni.c b/drivers/net/ethernet/freescale/dpaa2/dpni.c
index dd54e6953aeb..78fa325407ca 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpni.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpni.c
@@ -1786,3 +1786,134 @@ int dpni_remove_fs_entry(struct fsl_mc_io *mc_io,
 	/* send command to mc*/
 	return mc_send_command(mc_io, &cmd);
 }
+
+/**
+ * dpni_set_qos_table() - Set QoS mapping table
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPNI object
+ * @cfg:	QoS table configuration
+ *
+ * This function and all QoS-related functions require that
+ *'max_tcs > 1' was set at DPNI creation.
+ *
+ * warning: Before calling this function, call dpkg_prepare_key_cfg() to
+ *			prepare the key_cfg_iova parameter
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpni_set_qos_table(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       const struct dpni_qos_tbl_cfg *cfg)
+{
+	struct dpni_cmd_set_qos_table *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPNI_CMDID_SET_QOS_TBL,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dpni_cmd_set_qos_table *)cmd.params;
+	cmd_params->default_tc = cfg->default_tc;
+	cmd_params->key_cfg_iova = cpu_to_le64(cfg->key_cfg_iova);
+	dpni_set_field(cmd_params->discard_on_miss, DISCARD_ON_MISS,
+		       cfg->discard_on_miss);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dpni_add_qos_entry() - Add QoS mapping entry (to select a traffic class)
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPNI object
+ * @cfg:	QoS rule to add
+ * @tc_id:	Traffic class selection (0-7)
+ * @index:	Location in the QoS table where to insert the entry.
+ *		Only relevant if MASKING is enabled for QoS classification on
+ *		this DPNI, it is ignored for exact match.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpni_add_qos_entry(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       const struct dpni_rule_cfg *cfg,
+		       u8 tc_id,
+		       u16 index)
+{
+	struct dpni_cmd_add_qos_entry *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPNI_CMDID_ADD_QOS_ENT,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dpni_cmd_add_qos_entry *)cmd.params;
+	cmd_params->tc_id = tc_id;
+	cmd_params->key_size = cfg->key_size;
+	cmd_params->index = cpu_to_le16(index);
+	cmd_params->key_iova = cpu_to_le64(cfg->key_iova);
+	cmd_params->mask_iova = cpu_to_le64(cfg->mask_iova);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dpni_remove_qos_entry() - Remove QoS mapping entry
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPNI object
+ * @cfg:	QoS rule to remove
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpni_remove_qos_entry(struct fsl_mc_io *mc_io,
+			  u32 cmd_flags,
+			  u16 token,
+			  const struct dpni_rule_cfg *cfg)
+{
+	struct dpni_cmd_remove_qos_entry *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPNI_CMDID_REMOVE_QOS_ENT,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dpni_cmd_remove_qos_entry *)cmd.params;
+	cmd_params->key_size = cfg->key_size;
+	cmd_params->key_iova = cpu_to_le64(cfg->key_iova);
+	cmd_params->mask_iova = cpu_to_le64(cfg->mask_iova);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dpni_clear_qos_table() - Clear all QoS mapping entries
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPNI object
+ *
+ * Following this function call, all frames are directed to
+ * the default traffic class (0)
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpni_clear_qos_table(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token)
+{
+	struct fsl_mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPNI_CMDID_CLR_QOS_TBL,
+					  cmd_flags,
+					  token);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpni.h b/drivers/net/ethernet/freescale/dpaa2/dpni.h
index ee0711d06b3a..8c7ac20bf1a7 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpni.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpni.h
@@ -715,6 +715,26 @@ int dpni_set_rx_hash_dist(struct fsl_mc_io *mc_io,
 			  u16 token,
 			  const struct dpni_rx_dist_cfg *cfg);
 
+/**
+ * struct dpni_qos_tbl_cfg - Structure representing QOS table configuration
+ * @key_cfg_iova: I/O virtual address of 256 bytes DMA-able memory filled with
+ *		key extractions to be used as the QoS criteria by calling
+ *		dpkg_prepare_key_cfg()
+ * @discard_on_miss: Set to '1' to discard frames in case of no match (miss);
+ *		'0' to use the 'default_tc' in such cases
+ * @default_tc: Used in case of no-match and 'discard_on_miss'= 0
+ */
+struct dpni_qos_tbl_cfg {
+	u64 key_cfg_iova;
+	int discard_on_miss;
+	u8 default_tc;
+};
+
+int dpni_set_qos_table(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       const struct dpni_qos_tbl_cfg *cfg);
+
 /**
  * enum dpni_dest - DPNI destination types
  * @DPNI_DEST_NONE: Unassigned destination; The queue is set in parked mode and
@@ -961,6 +981,22 @@ int dpni_remove_fs_entry(struct fsl_mc_io *mc_io,
 			 u8 tc_id,
 			 const struct dpni_rule_cfg *cfg);
 
+int dpni_add_qos_entry(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       const struct dpni_rule_cfg *cfg,
+		       u8 tc_id,
+		       u16 index);
+
+int dpni_remove_qos_entry(struct fsl_mc_io *mc_io,
+			  u32 cmd_flags,
+			  u16 token,
+			  const struct dpni_rule_cfg *cfg);
+
+int dpni_clear_qos_table(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token);
+
 int dpni_get_api_version(struct fsl_mc_io *mc_io,
 			 u32 cmd_flags,
 			 u16 *major_ver,
-- 
2.17.1

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