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| author | Jacob Keller <jacob.e.keller@intel.com> | 2019-11-14 10:44:59 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-11-15 12:48:32 -0800 |
| commit | 6edd110b41d5aa63d29492eea637e4e344b5d71d (patch) | |
| tree | 9de1603a047e449e12cef35ba38008e7f36fff31 | |
| parent | e8e9c98dc3b52d77ae041baf76ff1c1fec2ad0da (diff) | |
| download | lwn-6edd110b41d5aa63d29492eea637e4e344b5d71d.tar.gz lwn-6edd110b41d5aa63d29492eea637e4e344b5d71d.zip | |
igb: reject unsupported external timestamp flags
Fix the igb PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.
In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.
This HW always time stamps both edges:
flags Meaning
---------------------------------------------------- --------------------------
PTP_ENABLE_FEATURE Time stamp both edges
PTP_ENABLE_FEATURE|PTP_RISING_EDGE Time stamp both edges
PTP_ENABLE_FEATURE|PTP_FALLING_EDGE Time stamp both edges
PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE Time stamp both edges
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/intel/igb/igb_ptp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c index 4997963149f6..0bce3e0f1af0 100644 --- a/drivers/net/ethernet/intel/igb/igb_ptp.c +++ b/drivers/net/ethernet/intel/igb/igb_ptp.c @@ -521,6 +521,12 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp, switch (rq->type) { case PTP_CLK_REQ_EXTTS: + /* Reject requests with unsupported flags */ + if (rq->extts.flags & ~(PTP_ENABLE_FEATURE | + PTP_RISING_EDGE | + PTP_FALLING_EDGE)) + return -EOPNOTSUPP; + if (on) { pin = ptp_find_pin(igb->ptp_clock, PTP_PF_EXTTS, rq->extts.index); |