1 files changed, 435 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/ef100_rep.c b/drivers/net/ethernet/sfc/ef100_rep.c
new file mode 100644
index 000000000000..73ae4656a6e7
--- /dev/null
+++ b/drivers/net/ethernet/sfc/ef100_rep.c
@@ -0,0 +1,435 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/****************************************************************************
+ * Driver for Solarflare network controllers and boards
+ * Copyright 2019 Solarflare Communications Inc.
+ * Copyright 2020-2022 Xilinx Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+
+#include "ef100_rep.h"
+#include "ef100_netdev.h"
+#include "ef100_nic.h"
+#include "mae.h"
+#include "rx_common.h"
+
+#define EFX_EF100_REP_DRIVER	"efx_ef100_rep"
+
+#define EFX_REP_DEFAULT_PSEUDO_RING_SIZE	64
+
+static int efx_ef100_rep_poll(struct napi_struct *napi, int weight);
+
+static int efx_ef100_rep_init_struct(struct efx_nic *efx, struct efx_rep *efv,
+				     unsigned int i)
+{
+	efv->parent = efx;
+	efv->idx = i;
+	INIT_LIST_HEAD(&efv->list);
+	efv->dflt.fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
+	INIT_LIST_HEAD(&efv->dflt.acts.list);
+	INIT_LIST_HEAD(&efv->rx_list);
+	spin_lock_init(&efv->rx_lock);
+	efv->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE |
+			  NETIF_MSG_LINK | NETIF_MSG_IFDOWN |
+			  NETIF_MSG_IFUP | NETIF_MSG_RX_ERR |
+			  NETIF_MSG_TX_ERR | NETIF_MSG_HW;
+	return 0;
+}
+
+static int efx_ef100_rep_open(struct net_device *net_dev)
+{
+	struct efx_rep *efv = netdev_priv(net_dev);
+
+	netif_napi_add(net_dev, &efv->napi, efx_ef100_rep_poll,
+		       NAPI_POLL_WEIGHT);
+	napi_enable(&efv->napi);
+	return 0;
+}
+
+static int efx_ef100_rep_close(struct net_device *net_dev)
+{
+	struct efx_rep *efv = netdev_priv(net_dev);
+
+	napi_disable(&efv->napi);
+	netif_napi_del(&efv->napi);
+	return 0;
+}
+
+static netdev_tx_t efx_ef100_rep_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
+{
+	struct efx_rep *efv = netdev_priv(dev);
+	struct efx_nic *efx = efv->parent;
+	netdev_tx_t rc;
+
+	/* __ef100_hard_start_xmit() will always return success even in the
+	 * case of TX drops, where it will increment efx's tx_dropped.  The
+	 * efv stats really only count attempted TX, not success/failure.
+	 */
+	atomic64_inc(&efv->stats.tx_packets);
+	atomic64_add(skb->len, &efv->stats.tx_bytes);
+	netif_tx_lock(efx->net_dev);
+	rc = __ef100_hard_start_xmit(skb, efx, dev, efv);
+	netif_tx_unlock(efx->net_dev);
+	return rc;
+}
+
+static int efx_ef100_rep_get_port_parent_id(struct net_device *dev,
+					    struct netdev_phys_item_id *ppid)
+{
+	struct efx_rep *efv = netdev_priv(dev);
+	struct efx_nic *efx = efv->parent;
+	struct ef100_nic_data *nic_data;
+
+	nic_data = efx->nic_data;
+	/* nic_data->port_id is a u8[] */
+	ppid->id_len = sizeof(nic_data->port_id);
+	memcpy(ppid->id, nic_data->port_id, sizeof(nic_data->port_id));
+	return 0;
+}
+
+static int efx_ef100_rep_get_phys_port_name(struct net_device *dev,
+					    char *buf, size_t len)
+{
+	struct efx_rep *efv = netdev_priv(dev);
+	struct efx_nic *efx = efv->parent;
+	struct ef100_nic_data *nic_data;
+	int ret;
+
+	nic_data = efx->nic_data;
+	ret = snprintf(buf, len, "p%upf%uvf%u", efx->port_num,
+		       nic_data->pf_index, efv->idx);
+	if (ret >= len)
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static void efx_ef100_rep_get_stats64(struct net_device *dev,
+				      struct rtnl_link_stats64 *stats)
+{
+	struct efx_rep *efv = netdev_priv(dev);
+
+	stats->rx_packets = atomic64_read(&efv->stats.rx_packets);
+	stats->tx_packets = atomic64_read(&efv->stats.tx_packets);
+	stats->rx_bytes = atomic64_read(&efv->stats.rx_bytes);
+	stats->tx_bytes = atomic64_read(&efv->stats.tx_bytes);
+	stats->rx_dropped = atomic64_read(&efv->stats.rx_dropped);
+	stats->tx_errors = atomic64_read(&efv->stats.tx_errors);
+}
+
+static const struct net_device_ops efx_ef100_rep_netdev_ops = {
+	.ndo_open		= efx_ef100_rep_open,
+	.ndo_stop		= efx_ef100_rep_close,
+	.ndo_start_xmit		= efx_ef100_rep_xmit,
+	.ndo_get_port_parent_id	= efx_ef100_rep_get_port_parent_id,
+	.ndo_get_phys_port_name	= efx_ef100_rep_get_phys_port_name,
+	.ndo_get_stats64	= efx_ef100_rep_get_stats64,
+};
+
+static void efx_ef100_rep_get_drvinfo(struct net_device *dev,
+				      struct ethtool_drvinfo *drvinfo)
+{
+	strscpy(drvinfo->driver, EFX_EF100_REP_DRIVER, sizeof(drvinfo->driver));
+}
+
+static u32 efx_ef100_rep_ethtool_get_msglevel(struct net_device *net_dev)
+{
+	struct efx_rep *efv = netdev_priv(net_dev);
+
+	return efv->msg_enable;
+}
+
+static void efx_ef100_rep_ethtool_set_msglevel(struct net_device *net_dev,
+					       u32 msg_enable)
+{
+	struct efx_rep *efv = netdev_priv(net_dev);
+
+	efv->msg_enable = msg_enable;
+}
+
+static void efx_ef100_rep_ethtool_get_ringparam(struct net_device *net_dev,
+						struct ethtool_ringparam *ring,
+						struct kernel_ethtool_ringparam *kring,
+						struct netlink_ext_ack *ext_ack)
+{
+	struct efx_rep *efv = netdev_priv(net_dev);
+
+	ring->rx_max_pending = U32_MAX;
+	ring->rx_pending = efv->rx_pring_size;
+}
+
+static int efx_ef100_rep_ethtool_set_ringparam(struct net_device *net_dev,
+					       struct ethtool_ringparam *ring,
+					       struct kernel_ethtool_ringparam *kring,
+					       struct netlink_ext_ack *ext_ack)
+{
+	struct efx_rep *efv = netdev_priv(net_dev);
+
+	if (ring->rx_mini_pending || ring->rx_jumbo_pending || ring->tx_pending)
+		return -EINVAL;
+
+	efv->rx_pring_size = ring->rx_pending;
+	return 0;
+}
+
+static const struct ethtool_ops efx_ef100_rep_ethtool_ops = {
+	.get_drvinfo		= efx_ef100_rep_get_drvinfo,
+	.get_msglevel		= efx_ef100_rep_ethtool_get_msglevel,
+	.set_msglevel		= efx_ef100_rep_ethtool_set_msglevel,
+	.get_ringparam		= efx_ef100_rep_ethtool_get_ringparam,
+	.set_ringparam		= efx_ef100_rep_ethtool_set_ringparam,
+};
+
+static struct efx_rep *efx_ef100_rep_create_netdev(struct efx_nic *efx,
+						   unsigned int i)
+{
+	struct net_device *net_dev;
+	struct efx_rep *efv;
+	int rc;
+
+	net_dev = alloc_etherdev_mq(sizeof(*efv), 1);
+	if (!net_dev)
+		return ERR_PTR(-ENOMEM);
+
+	efv = netdev_priv(net_dev);
+	rc = efx_ef100_rep_init_struct(efx, efv, i);
+	if (rc)
+		goto fail1;
+	efv->net_dev = net_dev;
+	rtnl_lock();
+	spin_lock_bh(&efx->vf_reps_lock);
+	list_add_tail(&efv->list, &efx->vf_reps);
+	spin_unlock_bh(&efx->vf_reps_lock);
+	if (netif_running(efx->net_dev) && efx->state == STATE_NET_UP) {
+		netif_device_attach(net_dev);
+		netif_carrier_on(net_dev);
+	} else {
+		netif_carrier_off(net_dev);
+		netif_tx_stop_all_queues(net_dev);
+	}
+	rtnl_unlock();
+
+	net_dev->netdev_ops = &efx_ef100_rep_netdev_ops;
+	net_dev->ethtool_ops = &efx_ef100_rep_ethtool_ops;
+	net_dev->min_mtu = EFX_MIN_MTU;
+	net_dev->max_mtu = EFX_MAX_MTU;
+	net_dev->features |= NETIF_F_LLTX;
+	net_dev->hw_features |= NETIF_F_LLTX;
+	return efv;
+fail1:
+	free_netdev(net_dev);
+	return ERR_PTR(rc);
+}
+
+static int efx_ef100_configure_rep(struct efx_rep *efv)
+{
+	struct efx_nic *efx = efv->parent;
+	u32 selector;
+	int rc;
+
+	efv->rx_pring_size = EFX_REP_DEFAULT_PSEUDO_RING_SIZE;
+	/* Construct mport selector for corresponding VF */
+	efx_mae_mport_vf(efx, efv->idx, &selector);
+	/* Look up actual mport ID */
+	rc = efx_mae_lookup_mport(efx, selector, &efv->mport);
+	if (rc)
+		return rc;
+	pci_dbg(efx->pci_dev, "VF %u has mport ID %#x\n", efv->idx, efv->mport);
+	/* mport label should fit in 16 bits */
+	WARN_ON(efv->mport >> 16);
+
+	return efx_tc_configure_default_rule_rep(efv);
+}
+
+static void efx_ef100_deconfigure_rep(struct efx_rep *efv)
+{
+	struct efx_nic *efx = efv->parent;
+
+	efx_tc_deconfigure_default_rule(efx, &efv->dflt);
+}
+
+static void efx_ef100_rep_destroy_netdev(struct efx_rep *efv)
+{
+	struct efx_nic *efx = efv->parent;
+
+	rtnl_lock();
+	spin_lock_bh(&efx->vf_reps_lock);
+	list_del(&efv->list);
+	spin_unlock_bh(&efx->vf_reps_lock);
+	rtnl_unlock();
+	synchronize_rcu();
+	free_netdev(efv->net_dev);
+}
+
+int efx_ef100_vfrep_create(struct efx_nic *efx, unsigned int i)
+{
+	struct efx_rep *efv;
+	int rc;
+
+	efv = efx_ef100_rep_create_netdev(efx, i);
+	if (IS_ERR(efv)) {
+		rc = PTR_ERR(efv);
+		pci_err(efx->pci_dev,
+			"Failed to create representor for VF %d, rc %d\n", i,
+			rc);
+		return rc;
+	}
+	rc = efx_ef100_configure_rep(efv);
+	if (rc) {
+		pci_err(efx->pci_dev,
+			"Failed to configure representor for VF %d, rc %d\n",
+			i, rc);
+		goto fail1;
+	}
+	rc = register_netdev(efv->net_dev);
+	if (rc) {
+		pci_err(efx->pci_dev,
+			"Failed to register representor for VF %d, rc %d\n",
+			i, rc);
+		goto fail2;
+	}
+	pci_dbg(efx->pci_dev, "Representor for VF %d is %s\n", i,
+		efv->net_dev->name);
+	return 0;
+fail2:
+	efx_ef100_deconfigure_rep(efv);
+fail1:
+	efx_ef100_rep_destroy_netdev(efv);
+	return rc;
+}
+
+void efx_ef100_vfrep_destroy(struct efx_nic *efx, struct efx_rep *efv)
+{
+	struct net_device *rep_dev;
+
+	rep_dev = efv->net_dev;
+	if (!rep_dev)
+		return;
+	netif_dbg(efx, drv, rep_dev, "Removing VF representor\n");
+	unregister_netdev(rep_dev);
+	efx_ef100_deconfigure_rep(efv);
+	efx_ef100_rep_destroy_netdev(efv);
+}
+
+void efx_ef100_fini_vfreps(struct efx_nic *efx)
+{
+	struct ef100_nic_data *nic_data = efx->nic_data;
+	struct efx_rep *efv, *next;
+
+	if (!nic_data->grp_mae)
+		return;
+
+	list_for_each_entry_safe(efv, next, &efx->vf_reps, list)
+		efx_ef100_vfrep_destroy(efx, efv);
+}
+
+static int efx_ef100_rep_poll(struct napi_struct *napi, int weight)
+{
+	struct efx_rep *efv = container_of(napi, struct efx_rep, napi);
+	unsigned int read_index;
+	struct list_head head;
+	struct sk_buff *skb;
+	bool need_resched;
+	int spent = 0;
+
+	INIT_LIST_HEAD(&head);
+	/* Grab up to 'weight' pending SKBs */
+	spin_lock_bh(&efv->rx_lock);
+	read_index = efv->write_index;
+	while (spent < weight && !list_empty(&efv->rx_list)) {
+		skb = list_first_entry(&efv->rx_list, struct sk_buff, list);
+		list_del(&skb->list);
+		list_add_tail(&skb->list, &head);
+		spent++;
+	}
+	spin_unlock_bh(&efv->rx_lock);
+	/* Receive them */
+	netif_receive_skb_list(&head);
+	if (spent < weight)
+		if (napi_complete_done(napi, spent)) {
+			spin_lock_bh(&efv->rx_lock);
+			efv->read_index = read_index;
+			/* If write_index advanced while we were doing the
+			 * RX, then storing our read_index won't re-prime the
+			 * fake-interrupt.  In that case, we need to schedule
+			 * NAPI again to consume the additional packet(s).
+			 */
+			need_resched = efv->write_index != read_index;
+			spin_unlock_bh(&efv->rx_lock);
+			if (need_resched)
+				napi_schedule(&efv->napi);
+		}
+	return spent;
+}
+
+void efx_ef100_rep_rx_packet(struct efx_rep *efv, struct efx_rx_buffer *rx_buf)
+{
+	u8 *eh = efx_rx_buf_va(rx_buf);
+	struct sk_buff *skb;
+	bool primed;
+
+	/* Don't allow too many queued SKBs to build up, as they consume
+	 * GFP_ATOMIC memory.  If we overrun, just start dropping.
+	 */
+	if (efv->write_index - READ_ONCE(efv->read_index) > efv->rx_pring_size) {
+		atomic64_inc(&efv->stats.rx_dropped);
+		if (net_ratelimit())
+			netif_dbg(efv->parent, rx_err, efv->net_dev,
+				  "nodesc-dropped packet of length %u\n",
+				  rx_buf->len);
+		return;
+	}
+
+	skb = netdev_alloc_skb(efv->net_dev, rx_buf->len);
+	if (!skb) {
+		atomic64_inc(&efv->stats.rx_dropped);
+		if (net_ratelimit())
+			netif_dbg(efv->parent, rx_err, efv->net_dev,
+				  "noskb-dropped packet of length %u\n",
+				  rx_buf->len);
+		return;
+	}
+	memcpy(skb->data, eh, rx_buf->len);
+	__skb_put(skb, rx_buf->len);
+
+	skb_record_rx_queue(skb, 0); /* rep is single-queue */
+
+	/* Move past the ethernet header */
+	skb->protocol = eth_type_trans(skb, efv->net_dev);
+
+	skb_checksum_none_assert(skb);
+
+	atomic64_inc(&efv->stats.rx_packets);
+	atomic64_add(rx_buf->len, &efv->stats.rx_bytes);
+
+	/* Add it to the rx list */
+	spin_lock_bh(&efv->rx_lock);
+	primed = efv->read_index == efv->write_index;
+	list_add_tail(&skb->list, &efv->rx_list);
+	efv->write_index++;
+	spin_unlock_bh(&efv->rx_lock);
+	/* Trigger rx work */
+	if (primed)
+		napi_schedule(&efv->napi);
+}
+
+struct efx_rep *efx_ef100_find_rep_by_mport(struct efx_nic *efx, u16 mport)
+{
+	struct efx_rep *efv, *out = NULL;
+
+	/* spinlock guards against list mutation while we're walking it;
+	 * but caller must also hold rcu_read_lock() to ensure the netdev
+	 * isn't freed after we drop the spinlock.
+	 */
+	spin_lock_bh(&efx->vf_reps_lock);
+	list_for_each_entry(efv, &efx->vf_reps, list)
+		if (efv->mport == mport) {
+			out = efv;
+			break;
+		}
+	spin_unlock_bh(&efx->vf_reps_lock);
+	return out;
+}