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net: igb: avoid using timespec 

We want to deprecate the use of 'struct timespec' on 32-bit
architectures, as it is will overflow in 2038. The igb
driver uses it to read the current time, and can simply
be changed to use ktime_get_real_ts64() instead.

Because of hardware limitations, there is still an overflow
in year 2106, which we cannot really avoid, but this documents
the overflow.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: intel-wired-lan@lists.osuosl.org
Reviewed-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2015-09-30 13:26:33 +02:00 committed by David S. Miller
parent 0a6241551d
commit 40c9b0796d
3 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/ethernet/intel/igb/igb.h
View File

@ -444,8 +444,8 @@ struct igb_adapter {
struct ptp_pin_desc sdp_config[IGB_N_SDP];
struct {
struct timespec start;
struct timespec period;
struct timespec64 start;
struct timespec64 period;
} perout[IGB_N_PEROUT];
char fw_version[32];

15
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -5392,7 +5392,7 @@ static void igb_tsync_interrupt(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
struct ptp_clock_event event;
struct timespec ts;
struct timespec64 ts;
u32 ack = 0, tsauxc, sec, nsec, tsicr = rd32(E1000_TSICR);
if (tsicr & TSINTR_SYS_WRAP) {
@ -5412,10 +5412,11 @@ static void igb_tsync_interrupt(struct igb_adapter *adapter)
if (tsicr & TSINTR_TT0) {
spin_lock(&adapter->tmreg_lock);
ts = timespec_add(adapter->perout[0].start,
adapter->perout[0].period);
ts = timespec64_add(adapter->perout[0].start,
adapter->perout[0].period);
/* u32 conversion of tv_sec is safe until y2106 */
wr32(E1000_TRGTTIML0, ts.tv_nsec);
wr32(E1000_TRGTTIMH0, ts.tv_sec);
wr32(E1000_TRGTTIMH0, (u32)ts.tv_sec);
tsauxc = rd32(E1000_TSAUXC);
tsauxc |= TSAUXC_EN_TT0;
wr32(E1000_TSAUXC, tsauxc);
@ -5426,10 +5427,10 @@ static void igb_tsync_interrupt(struct igb_adapter *adapter)
if (tsicr & TSINTR_TT1) {
spin_lock(&adapter->tmreg_lock);
ts = timespec_add(adapter->perout[1].start,
adapter->perout[1].period);
ts = timespec64_add(adapter->perout[1].start,
adapter->perout[1].period);
wr32(E1000_TRGTTIML1, ts.tv_nsec);
wr32(E1000_TRGTTIMH1, ts.tv_sec);
wr32(E1000_TRGTTIMH1, (u32)ts.tv_sec);
tsauxc = rd32(E1000_TSAUXC);
tsauxc |= TSAUXC_EN_TT1;
wr32(E1000_TSAUXC, tsauxc);

8
drivers/net/ethernet/intel/igb/igb_ptp.c
View File

@ -143,7 +143,7 @@ static void igb_ptp_write_i210(struct igb_adapter *adapter,
* sub-nanosecond resolution.
*/
wr32(E1000_SYSTIML, ts->tv_nsec);
wr32(E1000_SYSTIMH, ts->tv_sec);
wr32(E1000_SYSTIMH, (u32)ts->tv_sec);
}
/**
@ -479,7 +479,7 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
struct e1000_hw *hw = &igb->hw;
u32 tsauxc, tsim, tsauxc_mask, tsim_mask, trgttiml, trgttimh, freqout;
unsigned long flags;
struct timespec ts;
struct timespec64 ts;
int use_freq = 0, pin = -1;
s64 ns;
@ -523,14 +523,14 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
}
ts.tv_sec = rq->perout.period.sec;
ts.tv_nsec = rq->perout.period.nsec;
ns = timespec_to_ns(&ts);
ns = timespec64_to_ns(&ts);
ns = ns >> 1;
if (on && ns <= 70000000LL) {
if (ns < 8LL)
return -EINVAL;
use_freq = 1;
}
ts = ns_to_timespec(ns);
ts = ns_to_timespec64(ns);
if (rq->perout.index == 1) {
if (use_freq) {
tsauxc_mask = TSAUXC_EN_CLK1 | TSAUXC_ST1;