netdev - [PATCH net-next 1/5] net: enetc: create a common enetc_pf_to

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Message-Id: <20210416234225.3715819-2-olteanv@gmail.com>
Date:   Sat, 17 Apr 2021 02:42:21 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Po Liu <po.liu@....com>
Cc:     Claudiu Manoil <claudiu.manoil@....com>,
        Alex Marginean <alexandru.marginean@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, Michael Walle <michael@...le.cc>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net-next 1/5] net: enetc: create a common enetc_pf_to_port helper

From: Vladimir Oltean <vladimir.oltean@....com>

Even though ENETC interfaces are exposed as individual PCIe PFs with
their own driver instances, the ENETC is still fundamentally a
multi-port Ethernet controller, and some parts of the IP take a port
number (as can be seen in the PSFP implementation).

Create a common helper that can be used outside of the TSN code for
retrieving the ENETC port number based on the PF number. This is only
correct for LS1028A, the only Linux-capable instantiation of ENETC thus
far.

Note that ENETC port 3 is PF 6. The TSN code did not care about this
because ENETC port 3 does not support TSN, so the wrong mapping done by
enetc_get_port for PF 6 could have never been hit.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.h     | 16 ++++++++++++++++
 drivers/net/ethernet/freescale/enetc/enetc_qos.c | 16 ++++++----------
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index 3de71669e317..08b283347d9c 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -237,6 +237,22 @@ static inline bool enetc_si_is_pf(struct enetc_si *si)
 	return !!(si->hw.port);
 }
 
+static inline int enetc_pf_to_port(struct pci_dev *pf_pdev)
+{
+	switch (pf_pdev->devfn) {
+	case 0:
+		return 0;
+	case 1:
+		return 1;
+	case 2:
+		return 2;
+	case 6:
+		return 3;
+	default:
+		return -1;
+	}
+}
+
 #define ENETC_MAX_NUM_TXQS	8
 #define ENETC_INT_NAME_MAX	(IFNAMSIZ + 8)
 
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
index cb7fa4bceaf2..af699f2ad095 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -455,11 +455,6 @@ static struct enetc_psfp epsfp = {
 
 static LIST_HEAD(enetc_block_cb_list);
 
-static inline int enetc_get_port(struct enetc_ndev_priv *priv)
-{
-	return priv->si->pdev->devfn & 0x7;
-}
-
 /* Stream Identity Entry Set Descriptor */
 static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
 				 struct enetc_streamid *sid,
@@ -504,7 +499,7 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
 
 	si_conf = &cbd.sid_set;
 	/* Only one port supported for one entry, set itself */
-	si_conf->iports = cpu_to_le32(1 << enetc_get_port(priv));
+	si_conf->iports = cpu_to_le32(1 << enetc_pf_to_port(priv->si->pdev));
 	si_conf->id_type = 1;
 	si_conf->oui[2] = 0x0;
 	si_conf->oui[1] = 0x80;
@@ -529,7 +524,7 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
 
 	si_conf->en = 0x80;
 	si_conf->stream_handle = cpu_to_le32(sid->handle);
-	si_conf->iports = cpu_to_le32(1 << enetc_get_port(priv));
+	si_conf->iports = cpu_to_le32(1 << enetc_pf_to_port(priv->si->pdev));
 	si_conf->id_type = sid->filtertype;
 	si_conf->oui[2] = 0x0;
 	si_conf->oui[1] = 0x80;
@@ -591,7 +586,8 @@ static int enetc_streamfilter_hw_set(struct enetc_ndev_priv *priv,
 	}
 
 	sfi_config->sg_inst_table_index = cpu_to_le16(sfi->gate_id);
-	sfi_config->input_ports = cpu_to_le32(1 << enetc_get_port(priv));
+	sfi_config->input_ports =
+		cpu_to_le32(1 << enetc_pf_to_port(priv->si->pdev));
 
 	/* The priority value which may be matched against the
 	 * frame’s priority value to determine a match for this entry.
@@ -1562,10 +1558,10 @@ int enetc_setup_tc_psfp(struct net_device *ndev, void *type_data)
 
 	switch (f->command) {
 	case FLOW_BLOCK_BIND:
-		set_bit(enetc_get_port(priv), &epsfp.dev_bitmap);
+		set_bit(enetc_pf_to_port(priv->si->pdev), &epsfp.dev_bitmap);
 		break;
 	case FLOW_BLOCK_UNBIND:
-		clear_bit(enetc_get_port(priv), &epsfp.dev_bitmap);
+		clear_bit(enetc_pf_to_port(priv->si->pdev), &epsfp.dev_bitmap);
 		if (!epsfp.dev_bitmap)
 			clean_psfp_all();
 		break;
-- 
2.25.1