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: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 291 insertions, 0 deletions

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
new file mode 100644
index 000000000000..5528043095d8
--- /dev/null
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -0,0 +1,291 @@
+// 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;
+}