ionic: Add management of rx filters

Set up the infrastructure for managing Rx filters.  We can't ask the
hardware for what filters it has, so we keep a local list of filters
that we've pushed into the HW.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David 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_lif.o
+	   ionic_debugfs.o ionic_lif.o ionic_rx_filter.o

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

@@ -830,6 +830,8 @@ static void ionic_lif_deinit(struct ionic_lif *lif)
 
 	clear_bit(IONIC_LIF_INITED, lif->state);
 
+	ionic_rx_filters_deinit(lif);
+
 	napi_disable(&lif->adminqcq->napi);
 	ionic_lif_qcq_deinit(lif, lif->notifyqcq);
 	ionic_lif_qcq_deinit(lif, lif->adminqcq);
@@ -1009,6 +1011,10 @@ static int ionic_lif_init(struct ionic_lif *lif)
 	if (err)
 		goto err_out_notifyq_deinit;
 
+	err = ionic_rx_filters_init(lif);
+	if (err)
+		goto err_out_notifyq_deinit;
+
 	set_bit(IONIC_LIF_INITED, lif->state);
 
 	return 0;

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

@@ -5,6 +5,7 @@
 #define _IONIC_LIF_H_
 
 #include <linux/pci.h>
+#include "ionic_rx_filter.h"
 
 #define IONIC_ADMINQ_LENGTH	16	/* must be a power of two */
 #define IONIC_NOTIFYQ_LENGTH	64	/* must be a power of two */
@@ -90,6 +91,7 @@ struct ionic_lif {
 	dma_addr_t info_pa;
 	u32 info_sz;
 
+	struct ionic_rx_filters rx_filters;
 	unsigned long *dbid_inuse;
 	unsigned int dbid_count;
 	struct dentry *dentry;

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

@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+
+#include "ionic.h"
+#include "ionic_lif.h"
+#include "ionic_rx_filter.h"
+
+void ionic_rx_filter_free(struct ionic_lif *lif, struct ionic_rx_filter *f)
+{
+	struct device *dev = lif->ionic->dev;
+
+	hlist_del(&f->by_id);
+	hlist_del(&f->by_hash);
+	devm_kfree(dev, f);
+}
+
+int ionic_rx_filter_del(struct ionic_lif *lif, struct ionic_rx_filter *f)
+{
+	struct ionic_admin_ctx ctx = {
+		.work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
+		.cmd.rx_filter_del = {
+			.opcode = IONIC_CMD_RX_FILTER_DEL,
+			.filter_id = cpu_to_le32(f->filter_id),
+		},
+	};
+
+	return ionic_adminq_post_wait(lif, &ctx);
+}
+
+int ionic_rx_filters_init(struct ionic_lif *lif)
+{
+	unsigned int i;
+
+	spin_lock_init(&lif->rx_filters.lock);
+
+	for (i = 0; i < IONIC_RX_FILTER_HLISTS; i++) {
+		INIT_HLIST_HEAD(&lif->rx_filters.by_hash[i]);
+		INIT_HLIST_HEAD(&lif->rx_filters.by_id[i]);
+	}
+
+	return 0;
+}
+
+void ionic_rx_filters_deinit(struct ionic_lif *lif)
+{
+	struct ionic_rx_filter *f;
+	struct hlist_head *head;
+	struct hlist_node *tmp;
+	unsigned int i;
+
+	for (i = 0; i < IONIC_RX_FILTER_HLISTS; i++) {
+		head = &lif->rx_filters.by_id[i];
+		hlist_for_each_entry_safe(f, tmp, head, by_id)
+			ionic_rx_filter_free(lif, f);
+	}
+}
+
+int ionic_rx_filter_save(struct ionic_lif *lif, u32 flow_id, u16 rxq_index,
+			 u32 hash, struct ionic_admin_ctx *ctx)
+{
+	struct device *dev = lif->ionic->dev;
+	struct ionic_rx_filter_add_cmd *ac;
+	struct ionic_rx_filter *f;
+	struct hlist_head *head;
+	unsigned int key;
+
+	ac = &ctx->cmd.rx_filter_add;
+
+	switch (le16_to_cpu(ac->match)) {
+	case IONIC_RX_FILTER_MATCH_VLAN:
+		key = le16_to_cpu(ac->vlan.vlan);
+		break;
+	case IONIC_RX_FILTER_MATCH_MAC:
+		key = *(u32 *)ac->mac.addr;
+		break;
+	case IONIC_RX_FILTER_MATCH_MAC_VLAN:
+		key = le16_to_cpu(ac->mac_vlan.vlan);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	f = devm_kzalloc(dev, sizeof(*f), GFP_KERNEL);
+	if (!f)
+		return -ENOMEM;
+
+	f->flow_id = flow_id;
+	f->filter_id = le32_to_cpu(ctx->comp.rx_filter_add.filter_id);
+	f->rxq_index = rxq_index;
+	memcpy(&f->cmd, ac, sizeof(f->cmd));
+
+	INIT_HLIST_NODE(&f->by_hash);
+	INIT_HLIST_NODE(&f->by_id);
+
+	spin_lock_bh(&lif->rx_filters.lock);
+
+	key = hash_32(key, IONIC_RX_FILTER_HASH_BITS);
+	head = &lif->rx_filters.by_hash[key];
+	hlist_add_head(&f->by_hash, head);
+
+	key = f->filter_id & IONIC_RX_FILTER_HLISTS_MASK;
+	head = &lif->rx_filters.by_id[key];
+	hlist_add_head(&f->by_id, head);
+
+	spin_unlock_bh(&lif->rx_filters.lock);
+
+	return 0;
+}
+
+struct ionic_rx_filter *ionic_rx_filter_by_vlan(struct ionic_lif *lif, u16 vid)
+{
+	struct ionic_rx_filter *f;
+	struct hlist_head *head;
+	unsigned int key;
+
+	key = hash_32(vid, IONIC_RX_FILTER_HASH_BITS);
+	head = &lif->rx_filters.by_hash[key];
+
+	hlist_for_each_entry(f, head, by_hash) {
+		if (le16_to_cpu(f->cmd.match) != IONIC_RX_FILTER_MATCH_VLAN)
+			continue;
+		if (le16_to_cpu(f->cmd.vlan.vlan) == vid)
+			return f;
+	}
+
+	return NULL;
+}
+
+struct ionic_rx_filter *ionic_rx_filter_by_addr(struct ionic_lif *lif,
+						const u8 *addr)
+{
+	struct ionic_rx_filter *f;
+	struct hlist_head *head;
+	unsigned int key;
+
+	key = hash_32(*(u32 *)addr, IONIC_RX_FILTER_HASH_BITS);
+	head = &lif->rx_filters.by_hash[key];
+
+	hlist_for_each_entry(f, head, by_hash) {
+		if (le16_to_cpu(f->cmd.match) != IONIC_RX_FILTER_MATCH_MAC)
+			continue;
+		if (memcmp(addr, f->cmd.mac.addr, ETH_ALEN) == 0)
+			return f;
+	}
+
+	return NULL;
+}

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

@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
+
+#ifndef _IONIC_RX_FILTER_H_
+#define _IONIC_RX_FILTER_H_
+
+#define IONIC_RXQ_INDEX_ANY		(0xFFFF)
+struct ionic_rx_filter {
+	u32 flow_id;
+	u32 filter_id;
+	u16 rxq_index;
+	struct ionic_rx_filter_add_cmd cmd;
+	struct hlist_node by_hash;
+	struct hlist_node by_id;
+};
+
+#define IONIC_RX_FILTER_HASH_BITS	10
+#define IONIC_RX_FILTER_HLISTS		BIT(IONIC_RX_FILTER_HASH_BITS)
+#define IONIC_RX_FILTER_HLISTS_MASK	(IONIC_RX_FILTER_HLISTS - 1)
+struct ionic_rx_filters {
+	spinlock_t lock;				    /* filter list lock */
+	struct hlist_head by_hash[IONIC_RX_FILTER_HLISTS];  /* by skb hash */
+	struct hlist_head by_id[IONIC_RX_FILTER_HLISTS];    /* by filter_id */
+};
+
+void ionic_rx_filter_free(struct ionic_lif *lif, struct ionic_rx_filter *f);
+int ionic_rx_filter_del(struct ionic_lif *lif, struct ionic_rx_filter *f);
+int ionic_rx_filters_init(struct ionic_lif *lif);
+void ionic_rx_filters_deinit(struct ionic_lif *lif);
+int ionic_rx_filter_save(struct ionic_lif *lif, u32 flow_id, u16 rxq_index,
+			 u32 hash, struct ionic_admin_ctx *ctx);
+struct ionic_rx_filter *ionic_rx_filter_by_vlan(struct ionic_lif *lif, u16 vid);
+struct ionic_rx_filter *ionic_rx_filter_by_addr(struct ionic_lif *lif, const u8 *addr);
+
+#endif /* _IONIC_RX_FILTER_H_ */