Hello,
We have tried to use PTP with X710-T4L and 5Gb link, and encountered
clockcheck problem in phc2sys:
Apr 30 22:57:36 budtb phc2sys[5940]: [50.569] clockcheck: clock jumped
forward or running faster than expected!
After further code examination, it turned out that 5Gb case is not handled
in i40e_ptp.c
Here's the naive version of the patch that fixed the problem for us:
--- a/src/i40e_ptp.c 2021-02-23 07:02:32.900071129 -0800
+++ b/src/i40e_ptp.c 2021-04-30 22:58:15.365811522 -0700
@@ -18,12 +18,13 @@
*
* Much like the 82599, the update period is dependent upon the link speed:
* At 40Gb link or no link, the period is 1.6ns.
- * At 10Gb link, the period is multiplied by 2. (3.2ns)
+ * At 5Gb or 10Gb link, the period is multiplied by 2. (3.2ns)
* At 1Gb link, the period is multiplied by 20. (32ns)
* 1588 functionality is not supported at 100Mbps.
*/
#define I40E_PTP_40GB_INCVAL 0x0199999999ULL
#define I40E_PTP_10GB_INCVAL_MULT 2
+#define I40E_PTP_5GB_INCVAL_MULT 2
#define I40E_PTP_1GB_INCVAL_MULT 20
#define I40E_ISGN 0x80000000
@@ -935,6 +936,9 @@
case I40E_LINK_SPEED_10GB:
mult = I40E_PTP_10GB_INCVAL_MULT;
break;
+ case I40E_LINK_SPEED_5GB:
+ mult = I40E_PTP_5GB_INCVAL_MULT;
+ break;
case I40E_LINK_SPEED_1GB:
mult = I40E_PTP_1GB_INCVAL_MULT;
break;
What's the process to get it applied upstream?
Thanks,
Alex Sergeev
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