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igc: Enable HW VLAN Insertion and HW VLAN Stripping 

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@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Acked-by: Sasha Neftin <sasha.neftin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Muhammad Husaini Zulkifli 2021-06-04 01:44:54 +08:00 committed by Tony Nguyen
parent 5cde7beb27
commit 8d7449630e
4 changed files with 78 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/intel/igc/igc.h
View File

@ -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,

4
drivers/net/ethernet/intel/igc/igc_defines.h
View File

@ -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 */
@ -322,6 +323,9 @@
#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 */

74
drivers/net/ethernet/intel/igc/igc_main.c
View File

@ -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 HW to recognize an 802.1Q VLAN Ethernet packet */
wr32(IGC_VET, ETH_P_8021Q);
/* Re-enable PTP, where applicable. */
igc_ptp_reset(adapter);
@ -1122,13 +1125,17 @@ 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));
@ -1137,6 +1144,9 @@ 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;
}
@ -1171,8 +1181,9 @@ 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;
cmd_type = igc_tx_cmd_type(skb, tx_flags);
tx_desc = IGC_TX_DESC(tx_ring, i);
igc_tx_olinfo_status(tx_ring, tx_desc, tx_flags, skb->len - hdr_len);
@ -1443,6 +1454,11 @@ 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;
@ -1542,6 +1558,25 @@ 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((__force __be16)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
@ -1560,11 +1595,37 @@ 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)
{
bool enable = !!(features & NETIF_F_HW_VLAN_CTAG_RX);
struct igc_adapter *adapter = netdev_priv(netdev);
struct igc_hw *hw = &adapter->hw;
u32 ctrl;
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)
@ -3248,6 +3309,8 @@ 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);
@ -4547,6 +4610,9 @@ 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;
@ -5873,11 +5939,15 @@ 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;

1
drivers/net/ethernet/intel/igc/igc_regs.h
View File

@ -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 */