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ixgbe: clean up Rx time stamping code 

Time stamping resources are per-interface so there is no need
to keep separate last_rx_timestamp for each Rx ring, move
last_rx_timestamp to the adapter structure.

With last_rx_timestamp inside adapter, ixgbe_ptp_rx_hwtstamp()
inline function is reduced to a single if statement so it is
no longer necessary. If statement is placed directly in
ixgbe_process_skb_fields() fixing likely/unlikely marking.

Checks for q_vector or adapter to be NULL are superfluous.

Comment about taking I/O hit is a leftover from previous design.

Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jakub Kicinski 2014-04-02 10:33:28 +00:00 committed by Jeff Kirsher
parent e66c083aab
commit eda183c21a
3 changed files with 15 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/net/ethernet/intel/ixgbe/ixgbe.h
View File

@ -256,7 +256,6 @@ struct ixgbe_ring {
struct ixgbe_tx_buffer *tx_buffer_info;
struct ixgbe_rx_buffer *rx_buffer_info;
};
unsigned long last_rx_timestamp;
unsigned long state;
u8 __iomem *tail;
dma_addr_t dma; /* phys. address of descriptor ring */
@ -770,6 +769,7 @@ struct ixgbe_adapter {
unsigned long ptp_tx_start;
unsigned long last_overflow_check;
unsigned long last_rx_ptp_check;
unsigned long last_rx_timestamp;
spinlock_t tmreg_lock;
struct cyclecounter cc;
struct timecounter tc;
@ -944,24 +944,7 @@ void ixgbe_ptp_init(struct ixgbe_adapter *adapter);
void ixgbe_ptp_stop(struct ixgbe_adapter *adapter);
void ixgbe_ptp_overflow_check(struct ixgbe_adapter *adapter);
void ixgbe_ptp_rx_hang(struct ixgbe_adapter *adapter);
void __ixgbe_ptp_rx_hwtstamp(struct ixgbe_q_vector *q_vector,
struct sk_buff *skb);
static inline void ixgbe_ptp_rx_hwtstamp(struct ixgbe_ring *rx_ring,
union ixgbe_adv_rx_desc *rx_desc,
struct sk_buff *skb)
{
if (unlikely(!ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_TS)))
return;
__ixgbe_ptp_rx_hwtstamp(rx_ring->q_vector, skb);
/*
* Update the last_rx_timestamp timer in order to enable watchdog check
* for error case of latched timestamp on a dropped packet.
*/
rx_ring->last_rx_timestamp = jiffies;
}
void ixgbe_ptp_rx_hwtstamp(struct ixgbe_adapter *adapter, struct sk_buff *skb);
int ixgbe_ptp_set_ts_config(struct ixgbe_adapter *adapter, struct ifreq *ifr);
int ixgbe_ptp_get_ts_config(struct ixgbe_adapter *adapter, struct ifreq *ifr);
void ixgbe_ptp_start_cyclecounter(struct ixgbe_adapter *adapter);

3
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -1664,7 +1664,8 @@ static void ixgbe_process_skb_fields(struct ixgbe_ring *rx_ring,
ixgbe_rx_checksum(rx_ring, rx_desc, skb);
ixgbe_ptp_rx_hwtstamp(rx_ring, rx_desc, skb);
if (unlikely(ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_TS)))
ixgbe_ptp_rx_hwtstamp(rx_ring->q_vector->adapter, skb);
if ((dev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_VP)) {

36
drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
View File

@ -435,10 +435,8 @@ void ixgbe_ptp_overflow_check(struct ixgbe_adapter *adapter)
void ixgbe_ptp_rx_hang(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
struct ixgbe_ring *rx_ring;
u32 tsyncrxctl = IXGBE_READ_REG(hw, IXGBE_TSYNCRXCTL);
unsigned long rx_event;
int n;
/* if we don't have a valid timestamp in the registers, just update the
* timeout counter and exit
@ -450,11 +448,8 @@ void ixgbe_ptp_rx_hang(struct ixgbe_adapter *adapter)
/* determine the most recent watchdog or rx_timestamp event */
rx_event = adapter->last_rx_ptp_check;
for (n = 0; n < adapter->num_rx_queues; n++) {
rx_ring = adapter->rx_ring[n];
if (time_after(rx_ring->last_rx_timestamp, rx_event))
rx_event = rx_ring->last_rx_timestamp;
}
if (time_after(adapter->last_rx_timestamp, rx_event))
rx_event = adapter->last_rx_timestamp;
/* only need to read the high RXSTMP register to clear the lock */
if (time_is_before_jiffies(rx_event + 5*HZ)) {
@ -530,35 +525,22 @@ static void ixgbe_ptp_tx_hwtstamp_work(struct work_struct *work)
}
/**
* __ixgbe_ptp_rx_hwtstamp - utility function which checks for RX time stamp
* @q_vector: structure containing interrupt and ring information
* ixgbe_ptp_rx_hwtstamp - utility function which checks for RX time stamp
* @adapter: pointer to adapter struct
* @skb: particular skb to send timestamp with
*
* if the timestamp is valid, we convert it into the timecounter ns
* value, then store that result into the shhwtstamps structure which
* is passed up the network stack
*/
void __ixgbe_ptp_rx_hwtstamp(struct ixgbe_q_vector *q_vector,
struct sk_buff *skb)
void ixgbe_ptp_rx_hwtstamp(struct ixgbe_adapter *adapter, struct sk_buff *skb)
{
struct ixgbe_adapter *adapter;
struct ixgbe_hw *hw;
struct ixgbe_hw *hw = &adapter->hw;
struct skb_shared_hwtstamps *shhwtstamps;
u64 regval = 0, ns;
u32 tsyncrxctl;
unsigned long flags;
/* we cannot process timestamps on a ring without a q_vector */
if (!q_vector || !q_vector->adapter)
return;
adapter = q_vector->adapter;
hw = &adapter->hw;
/*
* Read the tsyncrxctl register afterwards in order to prevent taking an
* I/O hit on every packet.
*/
tsyncrxctl = IXGBE_READ_REG(hw, IXGBE_TSYNCRXCTL);
if (!(tsyncrxctl & IXGBE_TSYNCRXCTL_VALID))
return;
@ -566,13 +548,17 @@ void __ixgbe_ptp_rx_hwtstamp(struct ixgbe_q_vector *q_vector,
regval |= (u64)IXGBE_READ_REG(hw, IXGBE_RXSTMPL);
regval |= (u64)IXGBE_READ_REG(hw, IXGBE_RXSTMPH) << 32;
spin_lock_irqsave(&adapter->tmreg_lock, flags);
ns = timecounter_cyc2time(&adapter->tc, regval);
spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
shhwtstamps = skb_hwtstamps(skb);
shhwtstamps->hwtstamp = ns_to_ktime(ns);
/* Update the last_rx_timestamp timer in order to enable watchdog check
* for error case of latched timestamp on a dropped packet.
*/
adapter->last_rx_timestamp = jiffies;
}
int ixgbe_ptp_get_ts_config(struct ixgbe_adapter *adapter, struct ifreq *ifr)