linux-kernel - [PATCH net-next 3/4] vmxnet3: add command to allow disabling of offloads

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Date: Tue, 14 May 2024 11:20:48 -0700
From: Ronak Doshi <ronak.doshi@...adcom.com>
To: <netdev@...r.kernel.org>
CC: Ronak Doshi <ronak.doshi@...adcom.com>, Broadcom internal kernel review
 list <bcm-kernel-feedback-list@...adcom.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, open list
	<linux-kernel@...r.kernel.org>
Subject: [PATCH net-next 3/4] vmxnet3: add command to allow disabling of offloads

This patch adds a new command to disable certain offloads. This
allows user to specify, using VM configuration, if certain offloads
need to be disabled.

Signed-off-by: Ronak Doshi <ronak.doshi@...adcom.com>
Acked-by: Guolin Yang <guolin.yang@...adcom.com>
---
 drivers/net/vmxnet3/vmxnet3_defs.h    |  4 ++++
 drivers/net/vmxnet3/vmxnet3_drv.c     | 19 +++++++++++++++++++
 drivers/net/vmxnet3/vmxnet3_ethtool.c |  8 ++++++++
 drivers/net/vmxnet3/vmxnet3_int.h     |  1 +
 4 files changed, 32 insertions(+)

diff --git a/drivers/net/vmxnet3/vmxnet3_defs.h b/drivers/net/vmxnet3/vmxnet3_defs.h
index dcf1cf8e7a86..5e56e1d42f77 100644
--- a/drivers/net/vmxnet3/vmxnet3_defs.h
+++ b/drivers/net/vmxnet3/vmxnet3_defs.h
@@ -126,6 +126,7 @@ enum {
 	VMXNET3_CMD_GET_MAX_CAPABILITIES,
 	VMXNET3_CMD_GET_DCR0_REG,
 	VMXNET3_CMD_GET_TSRING_DESC_SIZE,
+	VMXNET3_CMD_GET_DISABLED_OFFLOADS,
 };
 
 /*
@@ -912,4 +913,7 @@ struct Vmxnet3_DriverShared {
 /* when new capability is introduced, update VMXNET3_CAP_MAX */
 #define VMXNET3_CAP_MAX                            VMXNET3_CAP_VERSION_7_MAX
 
+#define VMXNET3_OFFLOAD_TSO         (1 << 0)
+#define VMXNET3_OFFLOAD_LRO         (1 << 1)
+
 #endif /* _VMXNET3_DEFS_H_ */
diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 74cb63e3d311..2eaa9204c38e 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -3646,6 +3646,15 @@ static void
 vmxnet3_declare_features(struct vmxnet3_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
+	unsigned long flags;
+
+	if (VMXNET3_VERSION_GE_9(adapter)) {
+		spin_lock_irqsave(&adapter->cmd_lock, flags);
+		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
+				       VMXNET3_CMD_GET_DISABLED_OFFLOADS);
+		adapter->disabledOffloads = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_CMD);
+		spin_unlock_irqrestore(&adapter->cmd_lock, flags);
+	}
 
 	netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
 		NETIF_F_HW_CSUM | NETIF_F_HW_VLAN_CTAG_TX |
@@ -3663,6 +3672,16 @@ vmxnet3_declare_features(struct vmxnet3_adapter *adapter)
 			NETIF_F_GSO_UDP_TUNNEL_CSUM;
 	}
 
+	if (adapter->disabledOffloads & VMXNET3_OFFLOAD_TSO) {
+		netdev->hw_features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
+		netdev->hw_enc_features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
+	}
+
+	if (adapter->disabledOffloads & VMXNET3_OFFLOAD_LRO) {
+		netdev->hw_features &= ~(NETIF_F_LRO);
+		netdev->hw_enc_features &= ~(NETIF_F_LRO);
+	}
+
 	if (VMXNET3_VERSION_GE_7(adapter)) {
 		unsigned long flags;
 
diff --git a/drivers/net/vmxnet3/vmxnet3_ethtool.c b/drivers/net/vmxnet3/vmxnet3_ethtool.c
index 471f91c4204a..b78cda41f643 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
@@ -270,6 +270,14 @@ netdev_features_t vmxnet3_fix_features(struct net_device *netdev,
 	if (!(features & NETIF_F_RXCSUM))
 		features &= ~NETIF_F_LRO;
 
+	if ((features & NETIF_F_LRO) &&
+	    (adapter->disabledOffloads & VMXNET3_OFFLOAD_LRO))
+		features &= ~NETIF_F_LRO;
+
+	if ((features & (NETIF_F_TSO | NETIF_F_TSO6)) &&
+	    (adapter->disabledOffloads & VMXNET3_OFFLOAD_TSO))
+		features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
+
 	/* If XDP is enabled, then LRO should not be enabled */
 	if (vmxnet3_xdp_enabled(adapter) && (features & NETIF_F_LRO)) {
 		netdev_err(netdev, "LRO is not supported with XDP");
diff --git a/drivers/net/vmxnet3/vmxnet3_int.h b/drivers/net/vmxnet3/vmxnet3_int.h
index 68358e71526c..31e8db568db2 100644
--- a/drivers/net/vmxnet3/vmxnet3_int.h
+++ b/drivers/net/vmxnet3/vmxnet3_int.h
@@ -454,6 +454,7 @@ struct vmxnet3_adapter {
 	/* Size of buffer in the ts ring */
 	u16     tx_ts_desc_size;
 	u16     rx_ts_desc_size;
+	u32     disabledOffloads;
 };
 
 #define VMXNET3_WRITE_BAR0_REG(adapter, reg, val)  \
-- 
2.11.0