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igb: add per-packet timestamping 

This patch adds support for per-packet timestamping for the
82580 adapter. The rx timestamp code is also pulled out of the
inlined rx hotpath and instead moved to a seperate function.

This version adds a comment explaining the per-packet timestamping
code added to igb_hwtstamp_ioctl().

Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nick Nunley 2010-03-26 11:36:47 +00:00 committed by David S. Miller
parent 3365a2934c
commit 757b77e2b2
3 changed files with 41 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/igb/e1000_82575.h
View File

@ -53,6 +53,7 @@ extern void igb_rx_fifo_flush_82575(struct e1000_hw *hw);
#define E1000_SRRCTL_DESCTYPE_ADV_ONEBUF 0x02000000
#define E1000_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS 0x0A000000
#define E1000_SRRCTL_DROP_EN 0x80000000
#define E1000_SRRCTL_TIMESTAMP 0x40000000
#define E1000_MRQC_ENABLE_RSS_4Q 0x00000002
#define E1000_MRQC_ENABLE_VMDQ 0x00000003
@ -109,6 +110,7 @@ union e1000_adv_rx_desc {
#define E1000_RXDADV_HDRBUFLEN_MASK 0x7FE0
#define E1000_RXDADV_HDRBUFLEN_SHIFT 5
#define E1000_RXDADV_STAT_TS 0x10000 /* Pkt was time stamped */
#define E1000_RXDADV_STAT_TSIP 0x08000 /* timestamp in packet */
/* Transmit Descriptor - Advanced */
union e1000_adv_tx_desc {

2
drivers/net/igb/igb.h
View File

@ -107,6 +107,7 @@ struct vf_data_storage {
#define MAXIMUM_ETHERNET_VLAN_SIZE 1522
/* Supported Rx Buffer Sizes */
#define IGB_RXBUFFER_64 64 /* Used for packet split */
#define IGB_RXBUFFER_128 128 /* Used for packet split */
#define IGB_RXBUFFER_1024 1024
#define IGB_RXBUFFER_2048 2048
@ -324,6 +325,7 @@ struct igb_adapter {
#define IGB_82576_TSYNC_SHIFT 19
#define IGB_82580_TSYNC_SHIFT 24
#define IGB_TS_HDR_LEN 16
enum e1000_state_t {
__IGB_TESTING,
__IGB_RESETTING,

45
drivers/net/igb/igb_main.c
View File

@ -2576,6 +2576,8 @@ void igb_configure_rx_ring(struct igb_adapter *adapter,
E1000_SRRCTL_BSIZEPKT_SHIFT;
srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
}
if (hw->mac.type == e1000_82580)
srrctl |= E1000_SRRCTL_TIMESTAMP;
/* Only set Drop Enable if we are supporting multiple queues */
if (adapter->vfs_allocated_count || adapter->num_rx_queues > 1)
srrctl |= E1000_SRRCTL_DROP_EN;
@ -3910,6 +3912,9 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
* i.e. RXBUFFER_2048 --> size-4096 slab
*/
if (adapter->hw.mac.type == e1000_82580)
max_frame += IGB_TS_HDR_LEN;
if (max_frame <= IGB_RXBUFFER_1024)
rx_buffer_len = IGB_RXBUFFER_1024;
else if (max_frame <= MAXIMUM_ETHERNET_VLAN_SIZE)
@ -3917,6 +3922,14 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
else
rx_buffer_len = IGB_RXBUFFER_128;
if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN + IGB_TS_HDR_LEN) ||
(max_frame == MAXIMUM_ETHERNET_VLAN_SIZE + IGB_TS_HDR_LEN))
rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE + IGB_TS_HDR_LEN;
if ((adapter->hw.mac.type == e1000_82580) &&
(rx_buffer_len == IGB_RXBUFFER_128))
rx_buffer_len += IGB_RXBUFFER_64;
if (netif_running(netdev))
igb_down(adapter);
@ -5133,7 +5146,7 @@ static inline void igb_rx_checksum_adv(struct igb_ring *ring,
dev_dbg(&ring->pdev->dev, "cksum success: bits %08X\n", status_err);
}
static inline void igb_rx_hwtstamp(struct igb_q_vector *q_vector, u32 staterr,
static void igb_rx_hwtstamp(struct igb_q_vector *q_vector, u32 staterr,
struct sk_buff *skb)
{
struct igb_adapter *adapter = q_vector->adapter;
@ -5151,13 +5164,18 @@ static inline void igb_rx_hwtstamp(struct igb_q_vector *q_vector, u32 staterr,
* If nothing went wrong, then it should have a skb_shared_tx that we
* can turn into a skb_shared_hwtstamps.
*/
if (likely(!(staterr & E1000_RXDADV_STAT_TS)))
return;
if (!(rd32(E1000_TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID))
return;
if (staterr & E1000_RXDADV_STAT_TSIP) {
u32 *stamp = (u32 *)skb->data;
regval = le32_to_cpu(*(stamp + 2));
regval |= (u64)le32_to_cpu(*(stamp + 3)) << 32;
skb_pull(skb, IGB_TS_HDR_LEN);
} else {
if(!(rd32(E1000_TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID))
return;
regval = rd32(E1000_RXSTMPL);
regval |= (u64)rd32(E1000_RXSTMPH) << 32;
regval = rd32(E1000_RXSTMPL);
regval |= (u64)rd32(E1000_RXSTMPH) << 32;
}
igb_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval);
}
@ -5265,7 +5283,8 @@ send_up:
goto next_desc;
}
igb_rx_hwtstamp(q_vector, staterr, skb);
if (staterr & (E1000_RXDADV_STAT_TSIP | E1000_RXDADV_STAT_TS))
igb_rx_hwtstamp(q_vector, staterr, skb);
total_bytes += skb->len;
total_packets++;
@ -5545,6 +5564,16 @@ static int igb_hwtstamp_ioctl(struct net_device *netdev,
return 0;
}
/*
* Per-packet timestamping only works if all packets are
* timestamped, so enable timestamping in all packets as
* long as one rx filter was configured.
*/
if ((hw->mac.type == e1000_82580) && tsync_rx_ctl) {
tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
}
/* enable/disable TX */
regval = rd32(E1000_TSYNCTXCTL);
regval &= ~E1000_TSYNCTXCTL_ENABLED;