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authorVladimir Oltean <olteanv@gmail.com>2019-06-08 15:04:36 +0300
committerDavid S. Miller <davem@davemloft.net>2019-06-08 15:20:40 -0700
commitd3f9b90bf19fad05889e4bead7dc1b336da56118 (patch)
tree9ad11a7f4750bda5a02b1332a825d07b716203cc /include
parent47ed985e97f513b7746270e8c5d1f3a3f959b2da (diff)
net: dsa: sja1105: Build a minimal understanding of meta frames
Meta frames are sent on the CPU port by the switch if RX timestamping is enabled. They contain a partial timestamp of the previous frame. They are Ethernet frames with the Ethernet header constructed out of: - SJA1105_META_DMAC - SJA1105_META_SMAC - ETH_P_SJA1105_META The Ethernet payload will be decoded in a follow-up patch. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/dsa/sja1105.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/dsa/sja1105.h b/include/linux/dsa/sja1105.h
index 5a956f335022..cc4a909d1007 100644
--- a/include/linux/dsa/sja1105.h
+++ b/include/linux/dsa/sja1105.h
@@ -12,6 +12,7 @@
#include <net/dsa.h>
#define ETH_P_SJA1105 ETH_P_DSA_8021Q
+#define ETH_P_SJA1105_META 0x0008
/* IEEE 802.3 Annex 57A: Slow Protocols PDUs (01:80:C2:xx:xx:xx) */
#define SJA1105_LINKLOCAL_FILTER_A 0x0180C2000000ull
@@ -20,6 +21,16 @@
#define SJA1105_LINKLOCAL_FILTER_B 0x011B19000000ull
#define SJA1105_LINKLOCAL_FILTER_B_MASK 0xFFFFFF000000ull
+/* Source and Destination MAC of follow-up meta frames.
+ * Whereas the choice of SMAC only affects the unique identification of the
+ * switch as sender of meta frames, the DMAC must be an address that is present
+ * in the DSA master port's multicast MAC filter.
+ * 01-80-C2-00-00-0E is a good choice for this, as all profiles of IEEE 1588
+ * over L2 use this address for some purpose already.
+ */
+#define SJA1105_META_SMAC 0x222222222222ull
+#define SJA1105_META_DMAC 0x0180C200000Eull
+
struct sja1105_port {
struct dsa_port *dp;
bool hwts_tx_en;