netdev - [PATCH v3 net-next 8/9] sfc: hook up ef100 representor TX

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Date:   Wed, 20 Jul 2022 19:33:48 +0100
From:   <ecree@...inx.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux-net-drivers@....com>
CC:     <netdev@...r.kernel.org>, Edward Cree <ecree.xilinx@...il.com>
Subject: [PATCH v3 net-next 8/9] sfc: hook up ef100 representor TX

From: Edward Cree <ecree.xilinx@...il.com>

Implement .ndo_start_xmit() by calling into the parent PF's TX path.

Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/ef100_netdev.c | 11 ++++++++++-
 drivers/net/ethernet/sfc/ef100_netdev.h |  5 +++++
 drivers/net/ethernet/sfc/ef100_rep.c    | 23 +++++++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
index f4a124b8ffbe..3443477c26da 100644
--- a/drivers/net/ethernet/sfc/ef100_netdev.c
+++ b/drivers/net/ethernet/sfc/ef100_netdev.c
@@ -195,6 +195,15 @@ static netdev_tx_t ef100_hard_start_xmit(struct sk_buff *skb,
 					 struct net_device *net_dev)
 {
 	struct efx_nic *efx = efx_netdev_priv(net_dev);
+
+	return __ef100_hard_start_xmit(skb, efx, net_dev, NULL);
+}
+
+netdev_tx_t __ef100_hard_start_xmit(struct sk_buff *skb,
+				    struct efx_nic *efx,
+				    struct net_device *net_dev,
+				    struct efx_rep *efv)
+{
 	struct efx_tx_queue *tx_queue;
 	struct efx_channel *channel;
 	int rc;
@@ -209,7 +218,7 @@ static netdev_tx_t ef100_hard_start_xmit(struct sk_buff *skb,
 	}
 
 	tx_queue = &channel->tx_queue[0];
-	rc = ef100_enqueue_skb(tx_queue, skb);
+	rc = __ef100_enqueue_skb(tx_queue, skb, efv);
 	if (rc == 0)
 		return NETDEV_TX_OK;
 
diff --git a/drivers/net/ethernet/sfc/ef100_netdev.h b/drivers/net/ethernet/sfc/ef100_netdev.h
index 38b032ba0953..86bf985e0951 100644
--- a/drivers/net/ethernet/sfc/ef100_netdev.h
+++ b/drivers/net/ethernet/sfc/ef100_netdev.h
@@ -10,7 +10,12 @@
  */
 
 #include <linux/netdevice.h>
+#include "ef100_rep.h"
 
+netdev_tx_t __ef100_hard_start_xmit(struct sk_buff *skb,
+				    struct efx_nic *efx,
+				    struct net_device *net_dev,
+				    struct efx_rep *efv);
 int ef100_netdev_event(struct notifier_block *this,
 		       unsigned long event, void *ptr);
 int ef100_probe_netdev(struct efx_probe_data *probe_data);
diff --git a/drivers/net/ethernet/sfc/ef100_rep.c b/drivers/net/ethernet/sfc/ef100_rep.c
index cf0eac920592..6d4c3f0eee0a 100644
--- a/drivers/net/ethernet/sfc/ef100_rep.c
+++ b/drivers/net/ethernet/sfc/ef100_rep.c
@@ -10,6 +10,7 @@
  */
 
 #include "ef100_rep.h"
+#include "ef100_netdev.h"
 #include "ef100_nic.h"
 #include "mae.h"
 
@@ -28,6 +29,25 @@ static int efx_ef100_rep_init_struct(struct efx_nic *efx, struct efx_rep *efv,
 	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)
 {
@@ -60,6 +80,7 @@ static int efx_ef100_rep_get_phys_port_name(struct net_device *dev,
 }
 
 static const struct net_device_ops efx_ef100_rep_netdev_ops = {
+	.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,
 };
@@ -119,6 +140,8 @@ static struct efx_rep *efx_ef100_rep_create_netdev(struct efx_nic *efx,
 	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);