netdev - [PATCH v2 net-next 05/11] sfc_ef100: RX filter table management and related gubbins

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Message-ID: <6670c532-10fd-f93d-0d7b-937ceb423502@solarflare.com>
Date:   Fri, 31 Jul 2020 13:59:27 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 05/11] sfc_ef100: RX filter table management and
 related gubbins

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/ef100_netdev.c | 10 ++++
 drivers/net/ethernet/sfc/ef100_nic.c    | 67 +++++++++++++++++++++++++
 2 files changed, 77 insertions(+)

diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
index ec9ca81fed85..362a915c836a 100644
--- a/drivers/net/ethernet/sfc/ef100_netdev.c
+++ b/drivers/net/ethernet/sfc/ef100_netdev.c
@@ -89,6 +89,7 @@ static int ef100_net_stop(struct net_device *net_dev)
 	efx_disable_interrupts(efx);
 	efx_clear_interrupt_affinity(efx);
 	efx_nic_fini_interrupt(efx);
+	efx_remove_filters(efx);
 	efx_fini_napi(efx);
 	efx_remove_channels(efx);
 	efx_mcdi_free_vis(efx);
@@ -138,6 +139,10 @@ static int ef100_net_open(struct net_device *net_dev)
 
 	efx_init_napi(efx);
 
+	rc = efx_probe_filters(efx);
+	if (rc)
+		goto fail;
+
 	rc = efx_nic_init_interrupt(efx);
 	if (rc)
 		goto fail;
@@ -207,8 +212,13 @@ static const struct net_device_ops ef100_netdev_ops = {
 	.ndo_open               = ef100_net_open,
 	.ndo_stop               = ef100_net_stop,
 	.ndo_start_xmit         = ef100_hard_start_xmit,
+	.ndo_validate_addr      = eth_validate_addr,
+	.ndo_set_rx_mode        = efx_set_rx_mode, /* Lookout */
 	.ndo_get_phys_port_id   = efx_get_phys_port_id,
 	.ndo_get_phys_port_name = efx_get_phys_port_name,
+#ifdef CONFIG_RFS_ACCEL
+	.ndo_rx_flow_steer      = efx_filter_rfs,
+#endif
 };
 
 /*	Netdev registration
diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
index 5d576bd99059..95221b829ec4 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -347,6 +347,37 @@ static int ef100_phy_probe(struct efx_nic *efx)
 	return 0;
 }
 
+static int ef100_filter_table_probe(struct efx_nic *efx)
+{
+	return efx_mcdi_filter_table_probe(efx, true);
+}
+
+static int ef100_filter_table_up(struct efx_nic *efx)
+{
+	int rc;
+
+	rc = efx_mcdi_filter_add_vlan(efx, EFX_FILTER_VID_UNSPEC);
+	if (rc) {
+		efx_mcdi_filter_table_down(efx);
+		return rc;
+	}
+
+	rc = efx_mcdi_filter_add_vlan(efx, 0);
+	if (rc) {
+		efx_mcdi_filter_del_vlan(efx, EFX_FILTER_VID_UNSPEC);
+		efx_mcdi_filter_table_down(efx);
+	}
+
+	return rc;
+}
+
+static void ef100_filter_table_down(struct efx_nic *efx)
+{
+	efx_mcdi_filter_del_vlan(efx, 0);
+	efx_mcdi_filter_del_vlan(efx, EFX_FILTER_VID_UNSPEC);
+	efx_mcdi_filter_table_down(efx);
+}
+
 /*	Other
  */
 static int ef100_reconfigure_mac(struct efx_nic *efx, bool mtu_only)
@@ -393,12 +424,24 @@ static int ef100_reset(struct efx_nic *efx, enum reset_type reset_type)
 		__clear_bit(reset_type, &efx->reset_pending);
 		rc = dev_open(efx->net_dev, NULL);
 	} else if (reset_type == RESET_TYPE_ALL) {
+		/* A RESET_TYPE_ALL will cause filters to be removed, so we remove filters
+		 * and reprobe after reset to avoid removing filters twice
+		 */
+		down_read(&efx->filter_sem);
+		ef100_filter_table_down(efx);
+		up_read(&efx->filter_sem);
 		rc = efx_mcdi_reset(efx, reset_type);
 		if (rc)
 			return rc;
 
 		netif_device_attach(efx->net_dev);
 
+		down_read(&efx->filter_sem);
+		rc = ef100_filter_table_up(efx);
+		up_read(&efx->filter_sem);
+		if (rc)
+			return rc;
+
 		rc = dev_open(efx->net_dev, NULL);
 	} else {
 		rc = 1;	/* Leave the device closed */
@@ -480,6 +523,20 @@ const struct efx_nic_type ef100_pf_nic_type = {
 	.rx_remove = efx_mcdi_rx_remove,
 	.rx_write = ef100_rx_write,
 	.rx_packet = __ef100_rx_packet,
+	.max_rx_ip_filters = EFX_MCDI_FILTER_TBL_ROWS,
+	.filter_table_probe = ef100_filter_table_up,
+	.filter_table_restore = efx_mcdi_filter_table_restore,
+	.filter_table_remove = ef100_filter_table_down,
+	.filter_insert = efx_mcdi_filter_insert,
+	.filter_remove_safe = efx_mcdi_filter_remove_safe,
+	.filter_get_safe = efx_mcdi_filter_get_safe,
+	.filter_clear_rx = efx_mcdi_filter_clear_rx,
+	.filter_count_rx_used = efx_mcdi_filter_count_rx_used,
+	.filter_get_rx_id_limit = efx_mcdi_filter_get_rx_id_limit,
+	.filter_get_rx_ids = efx_mcdi_filter_get_rx_ids,
+#ifdef CONFIG_RFS_ACCEL
+	.filter_rfs_expire_one = efx_mcdi_filter_rfs_expire_one,
+#endif
 
 	.get_phys_port_id = efx_ef100_get_phys_port_id,
 
@@ -825,6 +882,12 @@ static int ef100_probe_main(struct efx_nic *efx)
 	if (rc)
 		goto fail;
 
+	down_write(&efx->filter_sem);
+	rc = ef100_filter_table_probe(efx);
+	up_write(&efx->filter_sem);
+	if (rc)
+		goto fail;
+
 	rc = ef100_register_netdev(efx);
 	if (rc)
 		goto fail;
@@ -862,6 +925,10 @@ void ef100_remove(struct efx_nic *efx)
 	struct ef100_nic_data *nic_data = efx->nic_data;
 
 	ef100_unregister_netdev(efx);
+
+	down_write(&efx->filter_sem);
+	efx_mcdi_filter_table_remove(efx);
+	up_write(&efx->filter_sem);
 	efx_fini_channels(efx);
 	kfree(efx->phy_data);
 	efx->phy_data = NULL;