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| author |   Stefan Sørensen <stefan.sorensen@spectralink.com> | 2014-07-22 15:20:45 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-07-22 19:56:18 -0700 |
| commit | 63502b8d01631bd41778a64c9f6b72ea409bf97b (patch) | |
| tree | 157d94a877a55474fec8f4bd3bf01fa05203fbe4 /drivers/net/ethernet/ti/cpsw_ale.h | |
| parent | sfc: Add support for busy polling (diff) | |
| download | linux-dev-63502b8d01631bd41778a64c9f6b72ea409bf97b.tar.xz linux-dev-63502b8d01631bd41778a64c9f6b72ea409bf97b.zip | |
dp83640: Fix receive timestamp race condition
When timestamping received packets, rx_timestamp_work may be scheduled
before the timestamps is received from the hardware resulting in the
packet beeing delivered without the timestamp.
This is fixed by changing the receive timestamp path:
On receiving a packet that need timestamping, the rxts list is
traversed. If a match is found, packet+timestamp are delivered,
otherwise the packet is added to a rx_queue.
When a timestamp arrives rx_queue is traversed and if a matching
packet is found, it is delivered with the timestamp. Otherwise the
timestamp is added to the rxts list for matching with packets arriving
later.
In case the hardware drops a timestamp, a workqueue regularly checks
the queue for old packets and delivers them without a timestamp.
Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions