ionic: Add basic lif support

The LIF is the Logical Interface, which represents the external
connections.  The NIC can multiplex many LIFs to a single port,
but in most setups, LIF0 is the primary control for the port.
Signed-off-by: NShannon Nelson <snelson@pensando.io>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/Makefile

@@ -4,4 +4,4 @@
 obj-$(CONFIG_IONIC) := ionic.o
 
 ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o ionic_dev.o \
-	   ionic_debugfs.o
+	   ionic_debugfs.o ionic_lif.o

drivers/net/ethernet/pensando/ionic/ionic.h

@@ -32,6 +32,13 @@ struct ionic {
 	struct ionic_dev_bar bars[IONIC_BARS_MAX];
 	unsigned int num_bars;
 	struct ionic_identity ident;
+	struct list_head lifs;
+	unsigned int nnqs_per_lif;
+	unsigned int neqs_per_lif;
+	unsigned int ntxqs_per_lif;
+	unsigned int nrxqs_per_lif;
+	DECLARE_BITMAP(lifbits, IONIC_LIFS_MAX);
+	unsigned int nintrs;
 };
 
 int ionic_dev_cmd_wait(struct ionic *ionic, unsigned long max_wait);

drivers/net/ethernet/pensando/ionic/ionic_bus.h

@@ -5,6 +5,8 @@
 #define _IONIC_BUS_H_
 
 const char *ionic_bus_info(struct ionic *ionic);
+int ionic_bus_alloc_irq_vectors(struct ionic *ionic, unsigned int nintrs);
+void ionic_bus_free_irq_vectors(struct ionic *ionic);
 int ionic_bus_register_driver(void);
 void ionic_bus_unregister_driver(void);
 

drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c

@@ -8,6 +8,7 @@
 
 #include "ionic.h"
 #include "ionic_bus.h"
+#include "ionic_lif.h"
 #include "ionic_debugfs.h"
 
 /* Supported devices */
@@ -23,6 +24,17 @@ const char *ionic_bus_info(struct ionic *ionic)
 	return pci_name(ionic->pdev);
 }
 
+int ionic_bus_alloc_irq_vectors(struct ionic *ionic, unsigned int nintrs)
+{
+	return pci_alloc_irq_vectors(ionic->pdev, nintrs, nintrs,
+				     PCI_IRQ_MSIX);
+}
+
+void ionic_bus_free_irq_vectors(struct ionic *ionic)
+{
+	pci_free_irq_vectors(ionic->pdev);
+}
+
 static int ionic_map_bars(struct ionic *ionic)
 {
 	struct pci_dev *pdev = ionic->pdev;
@@ -151,12 +163,44 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto err_out_reset;
 	}
 
+	/* Configure LIFs */
+	err = ionic_lif_identify(ionic, IONIC_LIF_TYPE_CLASSIC,
+				 &ionic->ident.lif);
+	if (err) {
+		dev_err(dev, "Cannot identify LIFs: %d, aborting\n", err);
+		goto err_out_port_reset;
+	}
+
+	err = ionic_lifs_size(ionic);
+	if (err) {
+		dev_err(dev, "Cannot size LIFs: %d, aborting\n", err);
+		goto err_out_port_reset;
+	}
+
+	err = ionic_lifs_alloc(ionic);
+	if (err) {
+		dev_err(dev, "Cannot allocate LIFs: %d, aborting\n", err);
+		goto err_out_free_irqs;
+	}
+
+	err = ionic_lifs_init(ionic);
+	if (err) {
+		dev_err(dev, "Cannot init LIFs: %d, aborting\n", err);
+		goto err_out_free_lifs;
+	}
+
 	err = ionic_devlink_register(ionic);
 	if (err)
 		dev_err(dev, "Cannot register devlink: %d\n", err);
 
 	return 0;
 
+err_out_free_lifs:
+	ionic_lifs_free(ionic);
+err_out_free_irqs:
+	ionic_bus_free_irq_vectors(ionic);
+err_out_port_reset:
+	ionic_port_reset(ionic);
 err_out_reset:
 	ionic_reset(ionic);
 err_out_teardown:
@@ -185,6 +229,9 @@ static void ionic_remove(struct pci_dev *pdev)
 		return;
 
 	ionic_devlink_unregister(ionic);
+	ionic_lifs_deinit(ionic);
+	ionic_lifs_free(ionic);
+	ionic_bus_free_irq_vectors(ionic);
 	ionic_port_reset(ionic);
 	ionic_reset(ionic);
 	ionic_dev_teardown(ionic);

drivers/net/ethernet/pensando/ionic/ionic_debugfs.c

 // SPDX-License-Identifier: GPL-2.0
 /* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
 
+#include <linux/pci.h>
 #include <linux/netdevice.h>
 
 #include "ionic.h"
 #include "ionic_bus.h"
+#include "ionic_lif.h"
 #include "ionic_debugfs.h"
 
 #ifdef CONFIG_DEBUG_FS
@@ -58,4 +60,38 @@ void ionic_debugfs_add_ident(struct ionic *ionic)
 			    ionic, &identity_fops) ? 0 : -EOPNOTSUPP;
 }
 
+void ionic_debugfs_add_sizes(struct ionic *ionic)
+{
+	debugfs_create_u32("nlifs", 0400, ionic->dentry,
+			   (u32 *)&ionic->ident.dev.nlifs);
+	debugfs_create_u32("nintrs", 0400, ionic->dentry, &ionic->nintrs);
+
+	debugfs_create_u32("ntxqs_per_lif", 0400, ionic->dentry,
+			   (u32 *)&ionic->ident.lif.eth.config.queue_count[IONIC_QTYPE_TXQ]);
+	debugfs_create_u32("nrxqs_per_lif", 0400, ionic->dentry,
+			   (u32 *)&ionic->ident.lif.eth.config.queue_count[IONIC_QTYPE_RXQ]);
+}
+
+static int netdev_show(struct seq_file *seq, void *v)
+{
+	struct net_device *netdev = seq->private;
+
+	seq_printf(seq, "%s\n", netdev->name);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(netdev);
+
+void ionic_debugfs_add_lif(struct ionic_lif *lif)
+{
+	lif->dentry = debugfs_create_dir(lif->name, lif->ionic->dentry);
+	debugfs_create_file("netdev", 0400, lif->dentry,
+			    lif->netdev, &netdev_fops);
+}
+
+void ionic_debugfs_del_lif(struct ionic_lif *lif)
+{
+	debugfs_remove_recursive(lif->dentry);
+	lif->dentry = NULL;
+}
 #endif

drivers/net/ethernet/pensando/ionic/ionic_debugfs.h

@@ -13,12 +13,18 @@ void ionic_debugfs_destroy(void);
 void ionic_debugfs_add_dev(struct ionic *ionic);
 void ionic_debugfs_del_dev(struct ionic *ionic);
 void ionic_debugfs_add_ident(struct ionic *ionic);
+void ionic_debugfs_add_sizes(struct ionic *ionic);
+void ionic_debugfs_add_lif(struct ionic_lif *lif);
+void ionic_debugfs_del_lif(struct ionic_lif *lif);
 #else
 static inline void ionic_debugfs_create(void) { }
 static inline void ionic_debugfs_destroy(void) { }
 static inline void ionic_debugfs_add_dev(struct ionic *ionic) { }
 static inline void ionic_debugfs_del_dev(struct ionic *ionic) { }
 static inline void ionic_debugfs_add_ident(struct ionic *ionic) { }
+static inline void ionic_debugfs_add_sizes(struct ionic *ionic) { }
+static inline void ionic_debugfs_add_lif(struct ionic_lif *lif) { }
+static inline void ionic_debugfs_del_lif(struct ionic_lif *lif) { }
 #endif
 
 #endif /* _IONIC_DEBUGFS_H_ */

drivers/net/ethernet/pensando/ionic/ionic_dev.c

@@ -226,3 +226,37 @@ void ionic_dev_cmd_port_pause(struct ionic_dev *idev, u8 pause_type)
 
 	ionic_dev_cmd_go(idev, &cmd);
 }
+
+/* LIF commands */
+void ionic_dev_cmd_lif_identify(struct ionic_dev *idev, u8 type, u8 ver)
+{
+	union ionic_dev_cmd cmd = {
+		.lif_identify.opcode = IONIC_CMD_LIF_IDENTIFY,
+		.lif_identify.type = type,
+		.lif_identify.ver = ver,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_lif_init(struct ionic_dev *idev, u16 lif_index,
+			    dma_addr_t info_pa)
+{
+	union ionic_dev_cmd cmd = {
+		.lif_init.opcode = IONIC_CMD_LIF_INIT,
+		.lif_init.index = cpu_to_le16(lif_index),
+		.lif_init.info_pa = cpu_to_le64(info_pa),
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_lif_reset(struct ionic_dev *idev, u16 lif_index)
+{
+	union ionic_dev_cmd cmd = {
+		.lif_init.opcode = IONIC_CMD_LIF_RESET,
+		.lif_init.index = cpu_to_le16(lif_index),
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}

drivers/net/ethernet/pensando/ionic/ionic_dev.h

@@ -10,6 +10,8 @@
 #include "ionic_if.h"
 #include "ionic_regs.h"
 
+#define IONIC_LIFS_MAX			1024
+
 struct ionic_dev_bar {
 	void __iomem *vaddr;
 	phys_addr_t bus_addr;
@@ -148,4 +150,9 @@ void ionic_dev_cmd_port_autoneg(struct ionic_dev *idev, u8 an_enable);
 void ionic_dev_cmd_port_fec(struct ionic_dev *idev, u8 fec_type);
 void ionic_dev_cmd_port_pause(struct ionic_dev *idev, u8 pause_type);
 
+void ionic_dev_cmd_lif_identify(struct ionic_dev *idev, u8 type, u8 ver);
+void ionic_dev_cmd_lif_init(struct ionic_dev *idev, u16 lif_index,
+			    dma_addr_t addr);
+void ionic_dev_cmd_lif_reset(struct ionic_dev *idev, u16 lif_index);
+
 #endif /* _IONIC_DEV_H_ */

drivers/net/ethernet/pensando/ionic/ionic_lif.c

+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/cpumask.h>
+
+#include "ionic.h"
+#include "ionic_bus.h"
+#include "ionic_lif.h"
+#include "ionic_debugfs.h"
+
+static struct ionic_lif *ionic_lif_alloc(struct ionic *ionic, unsigned int index)
+{
+	struct device *dev = ionic->dev;
+	struct net_device *netdev;
+	struct ionic_lif *lif;
+	int err;
+
+	netdev = alloc_etherdev_mqs(sizeof(*lif),
+				    ionic->ntxqs_per_lif, ionic->ntxqs_per_lif);
+	if (!netdev) {
+		dev_err(dev, "Cannot allocate netdev, aborting\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	SET_NETDEV_DEV(netdev, dev);
+
+	lif = netdev_priv(netdev);
+	lif->netdev = netdev;
+
+	lif->neqs = ionic->neqs_per_lif;
+	lif->nxqs = ionic->ntxqs_per_lif;
+
+	lif->ionic = ionic;
+	lif->index = index;
+
+	snprintf(lif->name, sizeof(lif->name), "lif%u", index);
+
+	/* allocate lif info */
+	lif->info_sz = ALIGN(sizeof(*lif->info), PAGE_SIZE);
+	lif->info = dma_alloc_coherent(dev, lif->info_sz,
+				       &lif->info_pa, GFP_KERNEL);
+	if (!lif->info) {
+		dev_err(dev, "Failed to allocate lif info, aborting\n");
+		err = -ENOMEM;
+		goto err_out_free_netdev;
+	}
+
+	list_add_tail(&lif->list, &ionic->lifs);
+
+	return lif;
+
+err_out_free_netdev:
+	free_netdev(lif->netdev);
+	lif = NULL;
+
+	return ERR_PTR(err);
+}
+
+int ionic_lifs_alloc(struct ionic *ionic)
+{
+	struct ionic_lif *lif;
+
+	INIT_LIST_HEAD(&ionic->lifs);
+
+	/* only build the first lif, others are for later features */
+	set_bit(0, ionic->lifbits);
+	lif = ionic_lif_alloc(ionic, 0);
+
+	return PTR_ERR_OR_ZERO(lif);
+}
+
+static void ionic_lif_reset(struct ionic_lif *lif)
+{
+	struct ionic_dev *idev = &lif->ionic->idev;
+
+	mutex_lock(&lif->ionic->dev_cmd_lock);
+	ionic_dev_cmd_lif_reset(idev, lif->index);
+	ionic_dev_cmd_wait(lif->ionic, DEVCMD_TIMEOUT);
+	mutex_unlock(&lif->ionic->dev_cmd_lock);
+}
+
+static void ionic_lif_free(struct ionic_lif *lif)
+{
+	struct device *dev = lif->ionic->dev;
+
+	ionic_lif_reset(lif);
+
+	/* free lif info */
+	dma_free_coherent(dev, lif->info_sz, lif->info, lif->info_pa);
+	lif->info = NULL;
+	lif->info_pa = 0;
+
+	/* free netdev & lif */
+	ionic_debugfs_del_lif(lif);
+	list_del(&lif->list);
+	free_netdev(lif->netdev);
+}
+
+void ionic_lifs_free(struct ionic *ionic)
+{
+	struct list_head *cur, *tmp;
+	struct ionic_lif *lif;
+
+	list_for_each_safe(cur, tmp, &ionic->lifs) {
+		lif = list_entry(cur, struct ionic_lif, list);
+
+		ionic_lif_free(lif);
+	}
+}
+
+static void ionic_lif_deinit(struct ionic_lif *lif)
+{
+	if (!test_bit(IONIC_LIF_INITED, lif->state))
+		return;
+
+	clear_bit(IONIC_LIF_INITED, lif->state);
+
+	ionic_lif_reset(lif);
+}
+
+void ionic_lifs_deinit(struct ionic *ionic)
+{
+	struct list_head *cur, *tmp;
+	struct ionic_lif *lif;
+
+	list_for_each_safe(cur, tmp, &ionic->lifs) {
+		lif = list_entry(cur, struct ionic_lif, list);
+		ionic_lif_deinit(lif);
+	}
+}
+
+static int ionic_lif_init(struct ionic_lif *lif)
+{
+	struct ionic_dev *idev = &lif->ionic->idev;
+	struct ionic_lif_init_comp comp;
+	int err;
+
+	ionic_debugfs_add_lif(lif);
+
+	mutex_lock(&lif->ionic->dev_cmd_lock);
+	ionic_dev_cmd_lif_init(idev, lif->index, lif->info_pa);
+	err = ionic_dev_cmd_wait(lif->ionic, DEVCMD_TIMEOUT);
+	ionic_dev_cmd_comp(idev, (union ionic_dev_cmd_comp *)&comp);
+	mutex_unlock(&lif->ionic->dev_cmd_lock);
+	if (err)
+		return err;
+
+	lif->hw_index = le16_to_cpu(comp.hw_index);
+
+	set_bit(IONIC_LIF_INITED, lif->state);
+
+	return 0;
+}
+
+int ionic_lifs_init(struct ionic *ionic)
+{
+	struct list_head *cur, *tmp;
+	struct ionic_lif *lif;
+	int err;
+
+	list_for_each_safe(cur, tmp, &ionic->lifs) {
+		lif = list_entry(cur, struct ionic_lif, list);
+		err = ionic_lif_init(lif);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+int ionic_lif_identify(struct ionic *ionic, u8 lif_type,
+		       union ionic_lif_identity *lid)
+{
+	struct ionic_dev *idev = &ionic->idev;
+	size_t sz;
+	int err;
+
+	sz = min(sizeof(*lid), sizeof(idev->dev_cmd_regs->data));
+
+	mutex_lock(&ionic->dev_cmd_lock);
+	ionic_dev_cmd_lif_identify(idev, lif_type, IONIC_IDENTITY_VERSION_1);
+	err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
+	memcpy_fromio(lid, &idev->dev_cmd_regs->data, sz);
+	mutex_unlock(&ionic->dev_cmd_lock);
+	if (err)
+		return (err);
+
+	dev_dbg(ionic->dev, "capabilities 0x%llx\n",
+		le64_to_cpu(lid->capabilities));
+
+	dev_dbg(ionic->dev, "eth.max_ucast_filters %d\n",
+		le32_to_cpu(lid->eth.max_ucast_filters));
+	dev_dbg(ionic->dev, "eth.max_mcast_filters %d\n",
+		le32_to_cpu(lid->eth.max_mcast_filters));
+	dev_dbg(ionic->dev, "eth.features 0x%llx\n",
+		le64_to_cpu(lid->eth.config.features));
+	dev_dbg(ionic->dev, "eth.queue_count[IONIC_QTYPE_ADMINQ] %d\n",
+		le32_to_cpu(lid->eth.config.queue_count[IONIC_QTYPE_ADMINQ]));
+	dev_dbg(ionic->dev, "eth.queue_count[IONIC_QTYPE_NOTIFYQ] %d\n",
+		le32_to_cpu(lid->eth.config.queue_count[IONIC_QTYPE_NOTIFYQ]));
+	dev_dbg(ionic->dev, "eth.queue_count[IONIC_QTYPE_RXQ] %d\n",
+		le32_to_cpu(lid->eth.config.queue_count[IONIC_QTYPE_RXQ]));
+	dev_dbg(ionic->dev, "eth.queue_count[IONIC_QTYPE_TXQ] %d\n",
+		le32_to_cpu(lid->eth.config.queue_count[IONIC_QTYPE_TXQ]));
+	dev_dbg(ionic->dev, "eth.config.name %s\n", lid->eth.config.name);
+	dev_dbg(ionic->dev, "eth.config.mac %pM\n", lid->eth.config.mac);
+	dev_dbg(ionic->dev, "eth.config.mtu %d\n",
+		le32_to_cpu(lid->eth.config.mtu));
+
+	return 0;
+}
+
+int ionic_lifs_size(struct ionic *ionic)
+{
+	struct ionic_identity *ident = &ionic->ident;
+	unsigned int nintrs, dev_nintrs;
+	union ionic_lif_config *lc;
+	unsigned int ntxqs_per_lif;
+	unsigned int nrxqs_per_lif;
+	unsigned int neqs_per_lif;
+	unsigned int nnqs_per_lif;
+	unsigned int nxqs, neqs;
+	unsigned int min_intrs;
+	int err;
+
+	lc = &ident->lif.eth.config;
+	dev_nintrs = le32_to_cpu(ident->dev.nintrs);
+	neqs_per_lif = le32_to_cpu(ident->lif.rdma.eq_qtype.qid_count);
+	nnqs_per_lif = le32_to_cpu(lc->queue_count[IONIC_QTYPE_NOTIFYQ]);
+	ntxqs_per_lif = le32_to_cpu(lc->queue_count[IONIC_QTYPE_TXQ]);
+	nrxqs_per_lif = le32_to_cpu(lc->queue_count[IONIC_QTYPE_RXQ]);
+
+	nxqs = min(ntxqs_per_lif, nrxqs_per_lif);
+	nxqs = min(nxqs, num_online_cpus());
+	neqs = min(neqs_per_lif, num_online_cpus());
+
+try_again:
+	/* interrupt usage:
+	 *    1 for master lif adminq/notifyq
+	 *    1 for each CPU for master lif TxRx queue pairs
+	 *    whatever's left is for RDMA queues
+	 */
+	nintrs = 1 + nxqs + neqs;
+	min_intrs = 2;  /* adminq + 1 TxRx queue pair */
+
+	if (nintrs > dev_nintrs)
+		goto try_fewer;
+
+	err = ionic_bus_alloc_irq_vectors(ionic, nintrs);
+	if (err < 0 && err != -ENOSPC) {
+		dev_err(ionic->dev, "Can't get intrs from OS: %d\n", err);
+		return err;
+	}
+	if (err == -ENOSPC)
+		goto try_fewer;
+
+	if (err != nintrs) {
+		ionic_bus_free_irq_vectors(ionic);
+		goto try_fewer;
+	}
+
+	ionic->nnqs_per_lif = nnqs_per_lif;
+	ionic->neqs_per_lif = neqs;
+	ionic->ntxqs_per_lif = nxqs;
+	ionic->nrxqs_per_lif = nxqs;
+	ionic->nintrs = nintrs;
+
+	ionic_debugfs_add_sizes(ionic);
+
+	return 0;
+
+try_fewer:
+	if (nnqs_per_lif > 1) {
+		nnqs_per_lif >>= 1;
+		goto try_again;
+	}
+	if (neqs > 1) {
+		neqs >>= 1;
+		goto try_again;
+	}
+	if (nxqs > 1) {
+		nxqs >>= 1;
+		goto try_again;
+	}
+	dev_err(ionic->dev, "Can't get minimum %d intrs from OS\n", min_intrs);
+	return -ENOSPC;
+}

drivers/net/ethernet/pensando/ionic/ionic_lif.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
+
+#ifndef _IONIC_LIF_H_
+#define _IONIC_LIF_H_
+
+#include <linux/pci.h>
+
+enum ionic_lif_state_flags {
+	IONIC_LIF_INITED,
+
+	/* leave this as last */
+	IONIC_LIF_STATE_SIZE
+};
+
+#define IONIC_LIF_NAME_MAX_SZ		32
+struct ionic_lif {
+	char name[IONIC_LIF_NAME_MAX_SZ];
+	struct list_head list;
+	struct net_device *netdev;
+	DECLARE_BITMAP(state, IONIC_LIF_STATE_SIZE);
+	struct ionic *ionic;
+	bool registered;
+	unsigned int index;
+	unsigned int hw_index;
+	unsigned int neqs;
+	unsigned int nxqs;
+
+	struct ionic_lif_info *info;
+	dma_addr_t info_pa;
+	u32 info_sz;
+
+	struct dentry *dentry;
+	u32 flags;
+};
+
+int ionic_lifs_alloc(struct ionic *ionic);
+void ionic_lifs_free(struct ionic *ionic);
+void ionic_lifs_deinit(struct ionic *ionic);
+int ionic_lifs_init(struct ionic *ionic);
+int ionic_lif_identify(struct ionic *ionic, u8 lif_type,
+		       union ionic_lif_identity *lif_ident);
+int ionic_lifs_size(struct ionic *ionic);
+
+#endif /* _IONIC_LIF_H_ */

drivers/net/ethernet/pensando/ionic/ionic_main.c

@@ -8,6 +8,7 @@
 
 #include "ionic.h"
 #include "ionic_bus.h"
+#include "ionic_lif.h"
 #include "ionic_debugfs.h"
 
 MODULE_DESCRIPTION(IONIC_DRV_DESCRIPTION);