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authorDavid S. Miller <davem@davemloft.net>2015-07-20 20:50:19 -0700
committerDavid S. Miller <davem@davemloft.net>2015-07-20 20:50:19 -0700
commitf3120acc7851bffd1cd15acd044b7fa6fa520e75 (patch)
tree04708b19d7b5292eea0eb59e5bb66b4b9fb86bf6 /Documentation
parent0e55a42ac89036d3f7debad74d9169a25d6ee307 (diff)
parent2ba6c0797c8b5a9f945345ef2b9193bd47e5f18e (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue
Jeff Kirsher says: ==================== Intel Wired LAN Driver Updates 2015-07-17 This series contains updates to igb, ixgbe, ixgbevf, i40e, bnx2x, freescale, siena and dp83640. Jacob provides several patches to clarify the intended way to implement both SIOCSHWTSTAMP and ethtool's get_ts_info(). It is okay to support the specific filters in SIOCSHWTSTAMP by upscaling them to the generic filters. Alex Duyck provides a igb patch to pull the time stamp from the fragment before it gets added to the skb, to avoid a possible issue in which the fragment can possibly be less than IGB_RX_HDR_LEN due to the time stamp being pulled after the copybreak check. Also provides a ixgbevf patch to fold the ixgbevf_pull_tail() call into ixgbevf_add_rx_frag(), which gives the advantage that the fragment does not have to be modified after it is added to the skb. Fan provides patches for ixgbe/ixgbevf to set the receive hash type based on receive descriptor RSS type. Todd provides a fix for igb where on check for link on any media other than copper was not being detected since it was looking on the incorrect PHY page (due to the page being used gets switched before the function to check link gets executed). ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/timestamping.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/networking/timestamping.txt b/Documentation/networking/timestamping.txt
index 5f0922613f1a..a977339fbe0a 100644
--- a/Documentation/networking/timestamping.txt
+++ b/Documentation/networking/timestamping.txt
@@ -359,6 +359,13 @@ the requested fine-grained filtering for incoming packets is not
supported, the driver may time stamp more than just the requested types
of packets.
+Drivers are free to use a more permissive configuration than the requested
+configuration. It is expected that drivers should only implement directly the
+most generic mode that can be supported. For example if the hardware can
+support HWTSTAMP_FILTER_V2_EVENT, then it should generally always upscale
+HWTSTAMP_FILTER_V2_L2_SYNC_MESSAGE, and so forth, as HWTSTAMP_FILTER_V2_EVENT
+is more generic (and more useful to applications).
+
A driver which supports hardware time stamping shall update the struct
with the actual, possibly more permissive configuration. If the
requested packets cannot be time stamped, then nothing should be