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authorGrygorii Strashko <grygorii.strashko@ti.com>2017-07-29 01:30:04 +0300
committerDavid S. Miller <davem@davemloft.net>2017-08-02 01:22:55 +0300
commit0d5f54fec0a18eea5e4ac005646fd2bc2118636c (patch)
tree6d4a6071695f878692f4cb2db76ff4de8cfc8da1 /drivers/soc/dove
parent999f129289ab1599e7cdc08804a9b5ec4e1418f4 (diff)
downloadlinux-0d5f54fec0a18eea5e4ac005646fd2bc2118636c.tar.xz
net: ethernet: ti: cpts: fix tx timestamping timeout
With the low speed Ethernet connection CPDMA notification about packet processing can be received before CPTS TX timestamp event, which is set when packet actually left CPSW while cpdma notification is sent when packet pushed in CPSW fifo. As result, when connection is slow and CPU is fast enough TX timestamping is not working properly. Fix it, by introducing TX SKB queue to store PTP SKBs for which Ethernet Transmit Event hasn't been received yet and then re-check this queue with new Ethernet Transmit Events by scheduling CPTS overflow work more often (every 1 jiffies) until TX SKB queue is not empty. Side effect of this change is: - User space tools require to take into account possible delay in TX timestamp processing (for example ptp4l works with tx_timestamp_timeout=400 under net traffic and tx_timestamp_timeout=25 in idle). Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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