nfp: introduce nfp_port

Encapsulate port information into struct nfp_port.  nfp_port will
soon be extended to contain devlink_port information.  It also makes
it easier to reuse port-related code between vNICs and representors.
Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: NSimon Horman <simon.horman@netronome.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/Makefile

@@ -20,7 +20,8 @@ nfp-objs := \
 	    nfp_net_ethtool.o \
 	    nfp_net_offload.o \
 	    nfp_net_main.o \
-	    nfp_netvf_main.o
+	    nfp_netvf_main.o \
+	    nfp_port.o
 
 ifeq ($(CONFIG_BPF_SYSCALL),y)
 nfp-objs += \

drivers/net/ethernet/netronome/nfp/nfp_net.h

@@ -116,6 +116,7 @@ struct nfp_cpp;
 struct nfp_eth_table_port;
 struct nfp_net;
 struct nfp_net_r_vector;
+struct nfp_port;
 
 /* Convenience macro for wrapping descriptor index on ring size */
 #define D_IDX(ring, idx)	((idx) & ((ring)->cnt - 1))
@@ -558,7 +559,7 @@ struct nfp_net_dp {
  * @vnic_list:		Entry on device vNIC list
  * @pdev:		Backpointer to PCI device
  * @app:		APP handle if available
- * @eth_port:		Translated ETH Table port entry
+ * @port:		Pointer to nfp_port structure if vNIC is a port
  */
 struct nfp_net {
 	struct nfp_net_dp dp;
@@ -630,7 +631,7 @@ struct nfp_net {
 	struct pci_dev *pdev;
 	struct nfp_app *app;
 
-	struct nfp_eth_table_port *eth_port;
+	struct nfp_port *port;
 };
 
 /* Functions to read/write from/to a BAR
@@ -802,6 +803,13 @@ static inline u32 nfp_qcp_wr_ptr_read(u8 __iomem *q)
 /* Globals */
 extern const char nfp_driver_version[];
 
+extern const struct net_device_ops nfp_net_netdev_ops;
+
+static inline bool nfp_netdev_is_nfp_net(struct net_device *netdev)
+{
+	return netdev->netdev_ops == &nfp_net_netdev_ops;
+}
+
 /* Prototypes */
 void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
 			    void __iomem *ctrl_bar);
@@ -835,8 +843,6 @@ int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *new,
 			  struct netlink_ext_ack *extack);
 
 bool nfp_net_link_changed_read_clear(struct nfp_net *nn);
-int nfp_net_refresh_eth_port(struct nfp_net *nn);
-void nfp_net_refresh_port_table(struct nfp_net *nn);
 
 #ifdef CONFIG_NFP_DEBUG
 void nfp_net_debugfs_create(void);

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -70,6 +70,7 @@
 #include "nfpcore/nfp_nsp.h"
 #include "nfp_net_ctrl.h"
 #include "nfp_net.h"
+#include "nfp_port.h"
 
 /**
  * nfp_net_get_fw_version() - Read and parse the FW version
@@ -2846,26 +2847,6 @@ nfp_net_features_check(struct sk_buff *skb, struct net_device *dev,
 	return features;
 }
 
-static int
-nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
-{
-	struct nfp_net *nn = netdev_priv(netdev);
-	int err;
-
-	if (!nn->eth_port)
-		return -EOPNOTSUPP;
-
-	if (!nn->eth_port->is_split)
-		err = snprintf(name, len, "p%d", nn->eth_port->label_port);
-	else
-		err = snprintf(name, len, "p%ds%d", nn->eth_port->label_port,
-			       nn->eth_port->label_subport);
-	if (err >= len)
-		return -EINVAL;
-
-	return 0;
-}
-
 /**
  * nfp_net_set_vxlan_port() - set vxlan port in SW and reconfigure HW
  * @nn:   NFP Net device to reconfigure
@@ -3028,7 +3009,7 @@ static int nfp_net_xdp(struct net_device *netdev, struct netdev_xdp *xdp)
 	}
 }
 
-static const struct net_device_ops nfp_net_netdev_ops = {
+const struct net_device_ops nfp_net_netdev_ops = {
 	.ndo_open		= nfp_net_netdev_open,
 	.ndo_stop		= nfp_net_netdev_close,
 	.ndo_start_xmit		= nfp_net_tx,
@@ -3040,7 +3021,7 @@ static const struct net_device_ops nfp_net_netdev_ops = {
 	.ndo_set_mac_address	= eth_mac_addr,
 	.ndo_set_features	= nfp_net_set_features,
 	.ndo_features_check	= nfp_net_features_check,
-	.ndo_get_phys_port_name	= nfp_net_get_phys_port_name,
+	.ndo_get_phys_port_name	= nfp_port_get_phys_port_name,
 	.ndo_udp_tunnel_add	= nfp_net_add_vxlan_port,
 	.ndo_udp_tunnel_del	= nfp_net_del_vxlan_port,
 	.ndo_xdp		= nfp_net_xdp,

drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c

@@ -53,6 +53,7 @@
 #include "nfp_app.h"
 #include "nfp_net_ctrl.h"
 #include "nfp_net.h"
+#include "nfp_port.h"
 
 enum nfp_dump_diag {
 	NFP_DUMP_NSP_DIAG = 0,
@@ -196,33 +197,42 @@ nfp_net_get_link_ksettings(struct net_device *netdev,
 		[NFP_NET_CFG_STS_LINK_RATE_50G]		= SPEED_50000,
 		[NFP_NET_CFG_STS_LINK_RATE_100G]	= SPEED_100000,
 	};
-	struct nfp_net *nn = netdev_priv(netdev);
+	struct nfp_eth_table_port *eth_port;
+	struct nfp_port *port;
+	struct nfp_net *nn;
 	u32 sts, ls;
 
+	/* Init to unknowns */
 	ethtool_link_ksettings_add_link_mode(cmd, supported, FIBRE);
 	cmd->base.port = PORT_OTHER;
 	cmd->base.speed = SPEED_UNKNOWN;
 	cmd->base.duplex = DUPLEX_UNKNOWN;
 
-	if (nn->eth_port)
-		cmd->base.autoneg = nn->eth_port->aneg != NFP_ANEG_DISABLED ?
+	port = nfp_port_from_netdev(netdev);
+	eth_port = __nfp_port_get_eth_port(port);
+	if (eth_port)
+		cmd->base.autoneg = eth_port->aneg != NFP_ANEG_DISABLED ?
 			AUTONEG_ENABLE : AUTONEG_DISABLE;
 
 	if (!netif_carrier_ok(netdev))
 		return 0;
 
+	if (!nfp_netdev_is_nfp_net(netdev))
+		return -EOPNOTSUPP;
+	nn = netdev_priv(netdev);
+
 	/* Use link speed from ETH table if available, otherwise try the BAR */
-	if (nn->eth_port) {
+	if (eth_port) {
 		int err;
 
 		if (nfp_net_link_changed_read_clear(nn)) {
-			err = nfp_net_refresh_eth_port(nn);
+			err = nfp_net_refresh_eth_port(port);
 			if (err)
 				return err;
 		}
 
-		cmd->base.port = nn->eth_port->port_type;
-		cmd->base.speed = nn->eth_port->speed;
+		cmd->base.port = eth_port->port_type;
+		cmd->base.speed = eth_port->speed;
 		cmd->base.duplex = DUPLEX_FULL;
 		return 0;
 	}
@@ -247,19 +257,22 @@ static int
 nfp_net_set_link_ksettings(struct net_device *netdev,
 			   const struct ethtool_link_ksettings *cmd)
 {
-	struct nfp_net *nn = netdev_priv(netdev);
+	struct nfp_eth_table_port *eth_port;
+	struct nfp_port *port;
 	struct nfp_nsp *nsp;
 	int err;
 
-	if (!nn->eth_port)
+	port = nfp_port_from_netdev(netdev);
+	eth_port = __nfp_port_get_eth_port(port);
+	if (!eth_port)
 		return -EOPNOTSUPP;
 
 	if (netif_running(netdev)) {
-		nn_warn(nn, "Changing settings not allowed on an active interface. It may cause the port to be disabled until reboot.\n");
+		netdev_warn(netdev, "Changing settings not allowed on an active interface. It may cause the port to be disabled until reboot.\n");
 		return -EBUSY;
 	}
 
-	nsp = nfp_eth_config_start(nn->app->cpp, nn->eth_port->index);
+	nsp = nfp_eth_config_start(port->app->cpp, eth_port->index);
 	if (IS_ERR(nsp))
 		return PTR_ERR(nsp);
 
@@ -268,7 +281,7 @@ nfp_net_set_link_ksettings(struct net_device *netdev,
 	if (err)
 		goto err_bad_set;
 	if (cmd->base.speed != SPEED_UNKNOWN) {
-		u32 speed = cmd->base.speed / nn->eth_port->lanes;
+		u32 speed = cmd->base.speed / eth_port->lanes;
 
 		err = __nfp_eth_set_speed(nsp, speed);
 		if (err)
@@ -279,7 +292,7 @@ nfp_net_set_link_ksettings(struct net_device *netdev,
 	if (err > 0)
 		return 0; /* no change */
 
-	nfp_net_refresh_port_table(nn);
+	nfp_net_refresh_port_table(port);
 
 	return err;
 

drivers/net/ethernet/netronome/nfp/nfp_net_main.c

@@ -58,6 +58,7 @@
 #include "nfp_net_ctrl.h"
 #include "nfp_net.h"
 #include "nfp_main.h"
+#include "nfp_port.h"
 
 #define NFP_PF_CSR_SLICE_SIZE	(32 * 1024)
 
@@ -142,14 +143,16 @@ static u8 __iomem *nfp_net_map_area(struct nfp_cpp *cpp,
 static void
 nfp_net_get_mac_addr(struct nfp_net *nn, struct nfp_cpp *cpp, unsigned int id)
 {
+	struct nfp_eth_table_port *eth_port;
 	struct nfp_net_dp *dp = &nn->dp;
 	u8 mac_addr[ETH_ALEN];
 	const char *mac_str;
 	char name[32];
 
-	if (nn->eth_port) {
-		ether_addr_copy(dp->netdev->dev_addr, nn->eth_port->mac_addr);
-		ether_addr_copy(dp->netdev->perm_addr, nn->eth_port->mac_addr);
+	eth_port = __nfp_port_get_eth_port(nn->port);
+	if (eth_port) {
+		ether_addr_copy(dp->netdev->dev_addr, eth_port->mac_addr);
+		ether_addr_copy(dp->netdev->perm_addr, eth_port->mac_addr);
 		return;
 	}
 
@@ -270,6 +273,7 @@ static u8 __iomem *nfp_net_pf_map_ctrl_bar(struct nfp_pf *pf)
 
 static void nfp_net_pf_free_vnic(struct nfp_pf *pf, struct nfp_net *nn)
 {
+	nfp_port_free(nn->port);
 	list_del(&nn->vnic_list);
 	pf->num_vnics--;
 	nfp_net_free(nn);
@@ -291,6 +295,7 @@ nfp_net_pf_alloc_vnic(struct nfp_pf *pf, void __iomem *ctrl_bar,
 		      int stride, struct nfp_net_fw_version *fw_ver,
 		      unsigned int eth_id)
 {
+	struct nfp_eth_table_port *eth_port;
 	u32 n_tx_rings, n_rx_rings;
 	struct nfp_net *nn;
 
@@ -310,7 +315,18 @@ nfp_net_pf_alloc_vnic(struct nfp_pf *pf, void __iomem *ctrl_bar,
 	nn->dp.is_vf = 0;
 	nn->stride_rx = stride;
 	nn->stride_tx = stride;
-	nn->eth_port = nfp_net_find_port(pf->eth_tbl, eth_id);
+
+	eth_port = nfp_net_find_port(pf->eth_tbl, eth_id);
+	if (eth_port) {
+		nn->port = nfp_port_alloc(pf->app, NFP_PORT_PHYS_PORT,
+					  nn->dp.netdev);
+		if (IS_ERR(nn->port)) {
+			nfp_net_free(nn);
+			return ERR_CAST(nn->port);
+		}
+		nn->port->eth_id = eth_id;
+		nn->port->eth_port = eth_port;
+	}
 
 	pf->num_vnics++;
 	list_add_tail(&nn->vnic_list, &pf->vnics);
@@ -380,12 +396,12 @@ nfp_net_pf_alloc_vnics(struct nfp_pf *pf, void __iomem *ctrl_bar,
 		ctrl_bar += NFP_PF_CSR_SLICE_SIZE;
 
 		/* Check if vNIC has external port associated and cfg is OK */
-		if (pf->eth_tbl && !nn->eth_port) {
+		if (pf->eth_tbl && !nn->port) {
 			nfp_err(pf->cpp, "NSP port entries don't match vNICs (no entry for port #%d)\n", i);
 			err = -EINVAL;
 			goto err_free_prev;
 		}
-		if (nn->eth_port && nn->eth_port->override_changed) {
+		if (nn->port && nn->port->eth_port->override_changed) {
 			nfp_warn(pf->cpp, "Config changed for port #%d, reboot required before port will be operational\n", i);
 			nfp_net_pf_free_vnic(pf, nn);
 			continue;
@@ -526,13 +542,20 @@ static void nfp_net_refresh_vnics(struct work_struct *work)
 
 	rtnl_lock();
 	list_for_each_entry(nn, &pf->vnics, vnic_list) {
-		if (!nn->eth_port)
+		if (!__nfp_port_get_eth_port(nn->port))
 			continue;
-		nn->eth_port = nfp_net_find_port(eth_table,
-						 nn->eth_port->eth_index);
-		if (!nn->eth_port)
-			nfp_err(pf->cpp,
-				"Warning: port disappeared after reconfig\n");
+		nn->port->eth_port = nfp_net_find_port(eth_table,
+						       nn->port->eth_id);
+		if (!nn->port->eth_port) {
+			nfp_warn(pf->cpp, "Warning: port #%d not present after reconfig\n",
+				 nn->port->eth_id);
+			continue;
+		}
+		if (nn->port->eth_port->override_changed) {
+			nfp_warn(pf->cpp, "Port config changed, unregistering. Reboot required before port will be operational again.\n");
+			nn->port->type = NFP_PORT_INVALID;
+			continue;
+		}
 	}
 	rtnl_unlock();
 
@@ -540,11 +563,9 @@ static void nfp_net_refresh_vnics(struct work_struct *work)
 	pf->eth_tbl = eth_table;
 
 	list_for_each_entry_safe(nn, next, &pf->vnics, vnic_list) {
-		if (nn->eth_port && !nn->eth_port->override_changed)
+		if (!nn->port || nn->port->type != NFP_PORT_INVALID)
 			continue;
 
-		nn_warn(nn, "Port config changed, unregistering. Reboot required before port will be operational again.\n");
-
 		nfp_net_debugfs_dir_clean(&nn->debugfs_dir);
 		nfp_net_clean(nn);
 
@@ -557,32 +578,33 @@ static void nfp_net_refresh_vnics(struct work_struct *work)
 	mutex_unlock(&pf->lock);
 }
 
-void nfp_net_refresh_port_table(struct nfp_net *nn)
+void nfp_net_refresh_port_table(struct nfp_port *port)
 {
-	struct nfp_pf *pf = pci_get_drvdata(nn->pdev);
+	struct nfp_pf *pf = port->app->pf;
 
 	schedule_work(&pf->port_refresh_work);
 }
 
-int nfp_net_refresh_eth_port(struct nfp_net *nn)
+int nfp_net_refresh_eth_port(struct nfp_port *port)
 {
+	struct nfp_cpp *cpp = port->app->cpp;
 	struct nfp_eth_table_port *eth_port;
 	struct nfp_eth_table *eth_table;
 
-	eth_table = nfp_eth_read_ports(nn->app->cpp);
+	eth_table = nfp_eth_read_ports(cpp);
 	if (!eth_table) {
-		nn_err(nn, "Error refreshing port state table!\n");
+		nfp_err(cpp, "Error refreshing port state table!\n");
 		return -EIO;
 	}
 
-	eth_port = nfp_net_find_port(eth_table, nn->eth_port->eth_index);
+	eth_port = nfp_net_find_port(eth_table, port->eth_id);
 	if (!eth_port) {
-		nn_err(nn, "Error finding state of the port!\n");
+		nfp_err(cpp, "Error finding state of the port!\n");
 		kfree(eth_table);
 		return -EIO;
 	}
 
-	memcpy(nn->eth_port, eth_port, sizeof(*eth_port));
+	memcpy(port->eth_port, eth_port, sizeof(*eth_port));
 
 	kfree(eth_table);
 

drivers/net/ethernet/netronome/nfp/nfp_port.c

+/*
+ * Copyright (C) 2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "nfpcore/nfp_nsp.h"
+#include "nfp_app.h"
+#include "nfp_main.h"
+#include "nfp_net.h"
+#include "nfp_port.h"
+
+struct nfp_port *nfp_port_from_netdev(struct net_device *netdev)
+{
+	struct nfp_net *nn;
+
+	if (WARN_ON(!nfp_netdev_is_nfp_net(netdev)))
+		return NULL;
+	nn = netdev_priv(netdev);
+
+	return nn->port;
+}
+
+struct nfp_eth_table_port *__nfp_port_get_eth_port(struct nfp_port *port)
+{
+	if (!port)
+		return NULL;
+	if (port->type != NFP_PORT_PHYS_PORT)
+		return NULL;
+
+	return port->eth_port;
+}
+
+int
+nfp_port_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
+{
+	struct nfp_eth_table_port *eth_port;
+	struct nfp_port *port;
+	int n;
+
+	port = nfp_port_from_netdev(netdev);
+	eth_port = __nfp_port_get_eth_port(port);
+	if (!eth_port)
+		return -EOPNOTSUPP;
+
+	if (!eth_port->is_split)
+		n = snprintf(name, len, "p%d", eth_port->label_port);
+	else
+		n = snprintf(name, len, "p%ds%d", eth_port->label_port,
+			     eth_port->label_subport);
+	if (n >= len)
+		return -EINVAL;
+
+	return 0;
+}
+
+struct nfp_port *
+nfp_port_alloc(struct nfp_app *app, enum nfp_port_type type,
+	       struct net_device *netdev)
+{
+	struct nfp_port *port;
+
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return ERR_PTR(-ENOMEM);
+
+	port->netdev = netdev;
+	port->type = type;
+	port->app = app;
+
+	return port;
+}
+
+void nfp_port_free(struct nfp_port *port)
+{
+	kfree(port);
+}

drivers/net/ethernet/netronome/nfp/nfp_port.h

+/*
+ * Copyright (C) 2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _NFP_PORT_H_
+#define _NFP_PORT_H_
+
+struct net_device;
+struct nfp_app;
+struct nfp_port;
+
+/**
+ * enum nfp_port_type - type of port NFP can switch traffic to
+ * @NFP_PORT_INVALID:	port is invalid, %NFP_PORT_PHYS_PORT transitions to this
+ *			state when port disappears because of FW fault or config
+ *			change
+ * @NFP_PORT_PHYS_PORT:	external NIC port
+ */
+enum nfp_port_type {
+	NFP_PORT_INVALID,
+	NFP_PORT_PHYS_PORT,
+};
+
+/**
+ * struct nfp_port - structure representing NFP port
+ * @netdev:	backpointer to associated netdev
+ * @type:	what port type does the entity represent
+ * @app:	backpointer to the app structure
+ * @eth_id:	for %NFP_PORT_PHYS_PORT port ID in NFP enumeration scheme
+ * @eth_port:	for %NFP_PORT_PHYS_PORT translated ETH Table port entry
+ */
+struct nfp_port {
+	struct net_device *netdev;
+	enum nfp_port_type type;
+
+	struct nfp_app *app;
+
+	unsigned int eth_id;
+	struct nfp_eth_table_port *eth_port;
+};
+
+struct nfp_port *nfp_port_from_netdev(struct net_device *netdev);
+struct nfp_eth_table_port *__nfp_port_get_eth_port(struct nfp_port *port);
+
+int
+nfp_port_get_phys_port_name(struct net_device *netdev, char *name, size_t len);
+
+struct nfp_port *
+nfp_port_alloc(struct nfp_app *app, enum nfp_port_type type,
+	       struct net_device *netdev);
+void nfp_port_free(struct nfp_port *port);
+
+int nfp_net_refresh_eth_port(struct nfp_port *port);
+void nfp_net_refresh_port_table(struct nfp_port *port);
+
+#endif