[Intel-wired-lan] [PATCH v1] igc: Enable HW VLAN Insertion and HW VLAN Stripping
Muhammad Husaini Zulkifli
muhammad.husaini.zulkifli at intel.com
Mon May 10 05:36:12 UTC 2021
Add HW VLAN acceleration protocol handling. In case of HW VLAN tagging,
we need that protocol available in the ndo_start_xmit(), so that it will be
stored in a new fields in the skb.
HW offloading is set to OFF by default.
Users are allow to turn on/off rx/tx HW vlan acceleration via ethtool.
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli at intel.com>
---
drivers/net/ethernet/intel/igc/igc.h | 1 +
drivers/net/ethernet/intel/igc/igc_defines.h | 5 ++
drivers/net/ethernet/intel/igc/igc_main.c | 73 +++++++++++++++++++-
drivers/net/ethernet/intel/igc/igc_regs.h | 1 +
4 files changed, 78 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index b6d3277c6f52..9e0bbb2e55e3 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -372,6 +372,7 @@ extern char igc_driver_name[];
/* VLAN info */
#define IGC_TX_FLAGS_VLAN_MASK 0xffff0000
+#define IGC_TX_FLAGS_VLAN_SHIFT 16
/* igc_test_staterr - tests bits within Rx descriptor status and error fields */
static inline __le32 igc_test_staterr(union igc_adv_rx_desc *rx_desc,
diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index 7cc48321bb70..8f6ba2b8d9e6 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -94,6 +94,7 @@
#define IGC_CTRL_SLU 0x00000040 /* Set link up (Force Link) */
#define IGC_CTRL_FRCSPD 0x00000800 /* Force Speed */
#define IGC_CTRL_FRCDPX 0x00001000 /* Force Duplex */
+#define IGC_CTRL_VME 0x40000000 /* IEEE VLAN mode enable */
#define IGC_CTRL_RFCE 0x08000000 /* Receive Flow Control enable */
#define IGC_CTRL_TFCE 0x10000000 /* Transmit flow control enable */
@@ -187,6 +188,7 @@
#define IGC_STATUS_SPEED_100 0x00000040 /* Speed 100Mb/s */
#define IGC_STATUS_SPEED_1000 0x00000080 /* Speed 1000Mb/s */
#define IGC_STATUS_SPEED_2500 0x00400000 /* Speed 2.5Gb/s */
+#define IGC_STATUS_VME 0x40000000 /* IEEE VLAN mode enable */
#define SPEED_10 10
#define SPEED_100 100
@@ -322,6 +324,9 @@
#define IGC_RXD_STAT_IXSM 0x04 /* Ignore checksum */
#define IGC_RXD_STAT_UDPCS 0x10 /* UDP xsum calculated */
#define IGC_RXD_STAT_TCPCS 0x20 /* TCP xsum calculated */
+#define IGC_RXD_STAT_VP 0x08 /* IEEE VLAN Packet */
+
+#define IGC_RXDEXT_STATERR_LB 0x00040000
/* Advanced Receive Descriptor bit definitions */
#define IGC_RXDADV_STAT_TSIP 0x08000 /* timestamp in packet */
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 5d1617961adb..e4a82606dd1c 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -111,6 +111,9 @@ void igc_reset(struct igc_adapter *adapter)
if (!netif_running(adapter->netdev))
igc_power_down_phy_copper_base(&adapter->hw);
+ /* Enable H/W to recognize an 802.1Q VLAN Ethernet packet */
+ wr32(IGC_VET, ETH_P_8021Q);
+
/* Re-enable PTP, where applicable. */
igc_ptp_reset(adapter);
@@ -1123,13 +1126,17 @@ static inline int igc_maybe_stop_tx(struct igc_ring *tx_ring, const u16 size)
((u32)((_input) & (_flag)) * ((_result) / (_flag))) : \
((u32)((_input) & (_flag)) / ((_flag) / (_result))))
-static u32 igc_tx_cmd_type(u32 tx_flags)
+static u32 igc_tx_cmd_type(struct sk_buff *skb, u32 tx_flags)
{
/* set type for advanced descriptor with frame checksum insertion */
u32 cmd_type = IGC_ADVTXD_DTYP_DATA |
IGC_ADVTXD_DCMD_DEXT |
IGC_ADVTXD_DCMD_IFCS;
+ /* set HW vlan bit if vlan is present */
+ cmd_type |= IGC_SET_FLAG(tx_flags, IGC_TX_FLAGS_VLAN,
+ (IGC_ADVTXD_DCMD_VLE));
+
/* set segmentation bits for TSO */
cmd_type |= IGC_SET_FLAG(tx_flags, IGC_TX_FLAGS_TSO,
(IGC_ADVTXD_DCMD_TSE));
@@ -1138,6 +1145,9 @@ static u32 igc_tx_cmd_type(u32 tx_flags)
cmd_type |= IGC_SET_FLAG(tx_flags, IGC_TX_FLAGS_TSTAMP,
(IGC_ADVTXD_MAC_TSTAMP));
+ /* insert frame checksum */
+ cmd_type ^= IGC_SET_FLAG(skb->no_fcs, 1, IGC_ADVTXD_DCMD_IFCS);
+
return cmd_type;
}
@@ -1172,7 +1182,7 @@ static int igc_tx_map(struct igc_ring *tx_ring,
u16 i = tx_ring->next_to_use;
unsigned int data_len, size;
dma_addr_t dma;
- u32 cmd_type = igc_tx_cmd_type(tx_flags);
+ u32 cmd_type = igc_tx_cmd_type(skb, tx_flags);
tx_desc = IGC_TX_DESC(tx_ring, i);
@@ -1445,6 +1455,11 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
}
}
+ if (skb_vlan_tag_present(skb)) {
+ tx_flags |= IGC_TX_FLAGS_VLAN;
+ tx_flags |= (skb_vlan_tag_get(skb) << IGC_TX_FLAGS_VLAN_SHIFT);
+ }
+
/* record initial flags and protocol */
first->tx_flags = tx_flags;
first->protocol = protocol;
@@ -1544,6 +1559,25 @@ static inline void igc_rx_hash(struct igc_ring *ring,
PKT_HASH_TYPE_L3);
}
+static void igc_rx_vlan(struct igc_ring *rx_ring,
+ union igc_adv_rx_desc *rx_desc,
+ struct sk_buff *skb)
+{
+ struct net_device *dev = rx_ring->netdev;
+ u16 vid;
+
+ if ((dev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
+ igc_test_staterr(rx_desc, IGC_RXD_STAT_VP)) {
+ if (igc_test_staterr(rx_desc, IGC_RXDEXT_STATERR_LB) &&
+ test_bit(IGC_RING_FLAG_RX_LB_VLAN_BSWAP, &rx_ring->flags))
+ vid = be16_to_cpu(rx_desc->wb.upper.vlan);
+ else
+ vid = le16_to_cpu(rx_desc->wb.upper.vlan);
+
+ __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
+ }
+}
+
/**
* igc_process_skb_fields - Populate skb header fields from Rx descriptor
* @rx_ring: rx descriptor ring packet is being transacted on
@@ -1562,11 +1596,37 @@ static void igc_process_skb_fields(struct igc_ring *rx_ring,
igc_rx_checksum(rx_ring, rx_desc, skb);
+ igc_rx_vlan(rx_ring, rx_desc, skb);
+
skb_record_rx_queue(skb, rx_ring->queue_index);
skb->protocol = eth_type_trans(skb, rx_ring->netdev);
}
+static void igc_vlan_mode(struct net_device *netdev, netdev_features_t features)
+{
+ struct igc_adapter *adapter = netdev_priv(netdev);
+ struct igc_hw *hw = &adapter->hw;
+ u32 ctrl;
+ bool enable = !!(features & NETIF_F_HW_VLAN_CTAG_RX);
+
+ ctrl = rd32(IGC_CTRL);
+
+ if (enable) {
+ /* enable VLAN tag insert/strip */
+ ctrl |= IGC_CTRL_VME;
+ } else {
+ /* disable VLAN tag insert/strip */
+ ctrl &= ~IGC_CTRL_VME;
+ }
+ wr32(IGC_CTRL, ctrl);
+}
+
+static void igc_restore_vlan(struct igc_adapter *adapter)
+{
+ igc_vlan_mode(adapter->netdev, adapter->netdev->features);
+}
+
static struct igc_rx_buffer *igc_get_rx_buffer(struct igc_ring *rx_ring,
const unsigned int size,
int *rx_buffer_pgcnt)
@@ -3254,6 +3314,8 @@ static void igc_configure(struct igc_adapter *adapter)
igc_get_hw_control(adapter);
igc_set_rx_mode(netdev);
+ igc_restore_vlan(adapter);
+
igc_setup_tctl(adapter);
igc_setup_mrqc(adapter);
igc_setup_rctl(adapter);
@@ -4553,6 +4615,9 @@ static int igc_set_features(struct net_device *netdev,
netdev_features_t changed = netdev->features ^ features;
struct igc_adapter *adapter = netdev_priv(netdev);
+ if (changed & NETIF_F_HW_VLAN_CTAG_RX)
+ igc_vlan_mode(netdev, features);
+
/* Add VLAN support */
if (!(changed & (NETIF_F_RXALL | NETIF_F_NTUPLE)))
return 0;
@@ -5882,11 +5947,15 @@ static int igc_probe(struct pci_dev *pdev,
/* copy netdev features into list of user selectable features */
netdev->hw_features |= NETIF_F_NTUPLE;
+ netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
+ netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
netdev->hw_features |= netdev->features;
if (pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;
+ netdev->vlan_features |= netdev->features;
+
/* MTU range: 68 - 9216 */
netdev->min_mtu = ETH_MIN_MTU;
netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE;
diff --git a/drivers/net/ethernet/intel/igc/igc_regs.h b/drivers/net/ethernet/intel/igc/igc_regs.h
index 2491d565d758..0f82990567d9 100644
--- a/drivers/net/ethernet/intel/igc/igc_regs.h
+++ b/drivers/net/ethernet/intel/igc/igc_regs.h
@@ -11,6 +11,7 @@
#define IGC_CTRL_EXT 0x00018 /* Extended Device Control - RW */
#define IGC_MDIC 0x00020 /* MDI Control - RW */
#define IGC_CONNSW 0x00034 /* Copper/Fiber switch control - RW */
+#define IGC_VET 0x00038 /* VLAN Ether Type - RW */
#define IGC_I225_PHPM 0x00E14 /* I225 PHY Power Management */
#define IGC_GPHY_VERSION 0x0001E /* I225 gPHY Firmware Version */
--
2.17.1
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