net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)

Add a VF driver for Microsoft Azure Network Adapter (MANA) that will be
available in the future.

Co-developed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Co-developed-by: Shachar Raindel <shacharr@microsoft.com>
Signed-off-by: Shachar Raindel <shacharr@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 250 insertions, 0 deletions

diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
new file mode 100644
index 000000000000..7e74339f39ae
--- /dev/null
+++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright (c) 2021, Microsoft Corporation. */
+
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+
+#include "mana.h"
+
+static const struct {
+	char name[ETH_GSTRING_LEN];
+	u16 offset;
+} mana_eth_stats[] = {
+	{"stop_queue", offsetof(struct mana_ethtool_stats, stop_queue)},
+	{"wake_queue", offsetof(struct mana_ethtool_stats, wake_queue)},
+};
+
+static int mana_get_sset_count(struct net_device *ndev, int stringset)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	unsigned int num_queues = apc->num_queues;
+
+	if (stringset != ETH_SS_STATS)
+		return -EINVAL;
+
+	return ARRAY_SIZE(mana_eth_stats) + num_queues * 4;
+}
+
+static void mana_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	unsigned int num_queues = apc->num_queues;
+	u8 *p = data;
+	int i;
+
+	if (stringset != ETH_SS_STATS)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(mana_eth_stats); i++) {
+		memcpy(p, mana_eth_stats[i].name, ETH_GSTRING_LEN);
+		p += ETH_GSTRING_LEN;
+	}
+
+	for (i = 0; i < num_queues; i++) {
+		sprintf(p, "rx_%d_packets", i);
+		p += ETH_GSTRING_LEN;
+		sprintf(p, "rx_%d_bytes", i);
+		p += ETH_GSTRING_LEN;
+	}
+
+	for (i = 0; i < num_queues; i++) {
+		sprintf(p, "tx_%d_packets", i);
+		p += ETH_GSTRING_LEN;
+		sprintf(p, "tx_%d_bytes", i);
+		p += ETH_GSTRING_LEN;
+	}
+}
+
+static void mana_get_ethtool_stats(struct net_device *ndev,
+				   struct ethtool_stats *e_stats, u64 *data)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	unsigned int num_queues = apc->num_queues;
+	void *eth_stats = &apc->eth_stats;
+	struct mana_stats *stats;
+	unsigned int start;
+	u64 packets, bytes;
+	int q, i = 0;
+
+	if (!apc->port_is_up)
+		return;
+
+	for (q = 0; q < ARRAY_SIZE(mana_eth_stats); q++)
+		data[i++] = *(u64 *)(eth_stats + mana_eth_stats[q].offset);
+
+	for (q = 0; q < num_queues; q++) {
+		stats = &apc->rxqs[q]->stats;
+
+		do {
+			start = u64_stats_fetch_begin_irq(&stats->syncp);
+			packets = stats->packets;
+			bytes = stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+
+		data[i++] = packets;
+		data[i++] = bytes;
+	}
+
+	for (q = 0; q < num_queues; q++) {
+		stats = &apc->tx_qp[q].txq.stats;
+
+		do {
+			start = u64_stats_fetch_begin_irq(&stats->syncp);
+			packets = stats->packets;
+			bytes = stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+
+		data[i++] = packets;
+		data[i++] = bytes;
+	}
+}
+
+static int mana_get_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *cmd,
+			  u32 *rules)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+
+	switch (cmd->cmd) {
+	case ETHTOOL_GRXRINGS:
+		cmd->data = apc->num_queues;
+		return 0;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static u32 mana_get_rxfh_key_size(struct net_device *ndev)
+{
+	return MANA_HASH_KEY_SIZE;
+}
+
+static u32 mana_rss_indir_size(struct net_device *ndev)
+{
+	return MANA_INDIRECT_TABLE_SIZE;
+}
+
+static int mana_get_rxfh(struct net_device *ndev, u32 *indir, u8 *key,
+			 u8 *hfunc)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	int i;
+
+	if (hfunc)
+		*hfunc = ETH_RSS_HASH_TOP; /* Toeplitz */
+
+	if (indir) {
+		for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
+			indir[i] = apc->indir_table[i];
+	}
+
+	if (key)
+		memcpy(key, apc->hashkey, MANA_HASH_KEY_SIZE);
+
+	return 0;
+}
+
+static int mana_set_rxfh(struct net_device *ndev, const u32 *indir,
+			 const u8 *key, const u8 hfunc)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	bool update_hash = false, update_table = false;
+	u32 save_table[MANA_INDIRECT_TABLE_SIZE];
+	u8 save_key[MANA_HASH_KEY_SIZE];
+	int i, err;
+
+	if (!apc->port_is_up)
+		return -EOPNOTSUPP;
+
+	if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
+		return -EOPNOTSUPP;
+
+	if (indir) {
+		for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
+			if (indir[i] >= apc->num_queues)
+				return -EINVAL;
+
+		update_table = true;
+		for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++) {
+			save_table[i] = apc->indir_table[i];
+			apc->indir_table[i] = indir[i];
+		}
+	}
+
+	if (key) {
+		update_hash = true;
+		memcpy(save_key, apc->hashkey, MANA_HASH_KEY_SIZE);
+		memcpy(apc->hashkey, key, MANA_HASH_KEY_SIZE);
+	}
+
+	err = mana_config_rss(apc, TRI_STATE_TRUE, update_hash, update_table);
+
+	if (err) { /* recover to original values */
+		if (update_table) {
+			for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
+				apc->indir_table[i] = save_table[i];
+		}
+
+		if (update_hash)
+			memcpy(apc->hashkey, save_key, MANA_HASH_KEY_SIZE);
+
+		mana_config_rss(apc, TRI_STATE_TRUE, update_hash, update_table);
+	}
+
+	return err;
+}
+
+static void mana_get_channels(struct net_device *ndev,
+			      struct ethtool_channels *channel)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+
+	channel->max_combined = apc->max_queues;
+	channel->combined_count = apc->num_queues;
+}
+
+static int mana_set_channels(struct net_device *ndev,
+			     struct ethtool_channels *channels)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	unsigned int new_count = channels->combined_count;
+	unsigned int old_count = apc->num_queues;
+	int err, err2;
+
+	if (!apc->port_is_up)
+		return -EOPNOTSUPP;
+
+	err = mana_detach(ndev, false);
+	if (err) {
+		netdev_err(ndev, "mana_detach failed: %d\n", err);
+		return err;
+	}
+
+	apc->num_queues = new_count;
+	err = mana_attach(ndev);
+	if (!err)
+		return 0;
+
+	netdev_err(ndev, "mana_attach failed: %d\n", err);
+
+	/* Try to roll it back to the old configuration. */
+	apc->num_queues = old_count;
+	err2 = mana_attach(ndev);
+	if (err2)
+		netdev_err(ndev, "mana re-attach failed: %d\n", err2);
+
+	return err;
+}
+
+const struct ethtool_ops mana_ethtool_ops = {
+	.get_ethtool_stats	= mana_get_ethtool_stats,
+	.get_sset_count		= mana_get_sset_count,
+	.get_strings		= mana_get_strings,
+	.get_rxnfc		= mana_get_rxnfc,
+	.get_rxfh_key_size	= mana_get_rxfh_key_size,
+	.get_rxfh_indir_size	= mana_rss_indir_size,
+	.get_rxfh		= mana_get_rxfh,
+	.set_rxfh		= mana_set_rxfh,
+	.get_channels		= mana_get_channels,
+	.set_channels		= mana_set_channels,
+};