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author | Vinicius Costa Gomes <vinicius.gomes@intel.com> | 2019-12-02 15:19:51 -0800 |
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committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2020-01-06 14:39:17 -0800 |
commit | 2c344ae24501558b14341247abef41e0b420c090 (patch) | |
tree | cbce2d8a71ddc3e36037384e21a70a86ecb007c1 /drivers/net/ethernet/intel/igc/igc_ptp.c | |
parent | 81b055205e8ba2d400c8fa5845ba540a4a880a3a (diff) | |
download | linux-stable-2c344ae24501558b14341247abef41e0b420c090.tar.gz linux-stable-2c344ae24501558b14341247abef41e0b420c090.tar.bz2 linux-stable-2c344ae24501558b14341247abef41e0b420c090.zip |
igc: Add support for TX timestamping
This adds support for timestamping packets being transmitted.
Based on the code from i210. The basic differences is that i225 has 4
registers to store the transmit timestamps (i210 has one). Right now,
we only support retrieving from one register, support for using the
other registers will be added later.
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/igc/igc_ptp.c')
-rw-r--r-- | drivers/net/ethernet/intel/igc/igc_ptp.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index 093ffc9312df..79ffb833aa80 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -284,6 +284,12 @@ static void igc_ptp_enable_tstamp_all_rxqueues(struct igc_adapter *adapter, * @adapter: networking device structure * @config: hwtstamp configuration * + * Outgoing time stamping can be enabled and disabled. Play nice and + * disable it when requested, although it shouldn't case any overhead + * when no packet needs it. At most one packet in the queue may be + * marked for time stamping, otherwise it would be impossible to tell + * for sure to which packet the hardware time stamp belongs. + * * Incoming time stamping has to be configured via the hardware * filters. Not all combinations are supported, in particular event * type has to be specified. Matching the kind of event packet is @@ -294,6 +300,7 @@ static void igc_ptp_enable_tstamp_all_rxqueues(struct igc_adapter *adapter, static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter, struct hwtstamp_config *config) { + u32 tsync_tx_ctl = IGC_TSYNCTXCTL_ENABLED; u32 tsync_rx_ctl = IGC_TSYNCRXCTL_ENABLED; struct igc_hw *hw = &adapter->hw; u32 tsync_rx_cfg = 0; @@ -305,6 +312,15 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter, if (config->flags) return -EINVAL; + switch (config->tx_type) { + case HWTSTAMP_TX_OFF: + tsync_tx_ctl = 0; + case HWTSTAMP_TX_ON: + break; + default: + return -ERANGE; + } + switch (config->rx_filter) { case HWTSTAMP_FILTER_NONE: tsync_rx_ctl = 0; @@ -368,6 +384,15 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter, } } + if (tsync_tx_ctl) + tsync_tx_ctl = IGC_TSYNCTXCTL_ENABLED; + + /* enable/disable TX */ + regval = rd32(IGC_TSYNCTXCTL); + regval &= ~IGC_TSYNCTXCTL_ENABLED; + regval |= tsync_tx_ctl; + wr32(IGC_TSYNCTXCTL, regval); + /* enable/disable RX */ regval = rd32(IGC_TSYNCRXCTL); regval &= ~(IGC_TSYNCRXCTL_ENABLED | IGC_TSYNCRXCTL_TYPE_MASK); @@ -442,8 +467,75 @@ void igc_ptp_tx_hang(struct igc_adapter *adapter) } } +/** + * igc_ptp_tx_hwtstamp - utility function which checks for TX time stamp + * @adapter: Board private structure + * + * If we were asked to do hardware stamping and such a time stamp is + * available, then it must have been for this skb here because we only + * allow only one such packet into the queue. + */ +static void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter) +{ + struct sk_buff *skb = adapter->ptp_tx_skb; + struct skb_shared_hwtstamps shhwtstamps; + struct igc_hw *hw = &adapter->hw; + u64 regval; + + regval = rd32(IGC_TXSTMPL); + regval |= (u64)rd32(IGC_TXSTMPH) << 32; + igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval); + + /* Clear the lock early before calling skb_tstamp_tx so that + * applications are not woken up before the lock bit is clear. We use + * a copy of the skb pointer to ensure other threads can't change it + * while we're notifying the stack. + */ + adapter->ptp_tx_skb = NULL; + clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state); + + /* Notify the stack and free the skb after we've unlocked */ + skb_tstamp_tx(skb, &shhwtstamps); + dev_kfree_skb_any(skb); +} + +/** + * igc_ptp_tx_work + * @work: pointer to work struct + * + * This work function polls the TSYNCTXCTL valid bit to determine when a + * timestamp has been taken for the current stored skb. + */ void igc_ptp_tx_work(struct work_struct *work) { + struct igc_adapter *adapter = container_of(work, struct igc_adapter, + ptp_tx_work); + struct igc_hw *hw = &adapter->hw; + u32 tsynctxctl; + + if (!adapter->ptp_tx_skb) + return; + + if (time_is_before_jiffies(adapter->ptp_tx_start + + IGC_PTP_TX_TIMEOUT)) { + dev_kfree_skb_any(adapter->ptp_tx_skb); + adapter->ptp_tx_skb = NULL; + clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state); + adapter->tx_hwtstamp_timeouts++; + /* Clear the tx valid bit in TSYNCTXCTL register to enable + * interrupt + */ + rd32(IGC_TXSTMPH); + dev_warn(&adapter->pdev->dev, "clearing Tx timestamp hang\n"); + return; + } + + tsynctxctl = rd32(IGC_TSYNCTXCTL); + if (tsynctxctl & IGC_TSYNCTXCTL_VALID) + igc_ptp_tx_hwtstamp(adapter); + else + /* reschedule to check later */ + schedule_work(&adapter->ptp_tx_work); } /** |