@@ -24,6 +24,36 @@ static inline bool sja1105_is_link_local(const struct sk_buff *skb)
return false;
}
+struct sja1105_meta {
+ u64 tstamp;
+ u64 dmac_byte_4;
+ u64 dmac_byte_3;
+ u64 source_port;
+ u64 switch_id;
+};
+
+static void sja1105_meta_unpack(const struct sk_buff *skb,
+ struct sja1105_meta *meta)
+{
+ u8 *buf = skb_mac_header(skb) + ETH_HLEN;
+
+ /* UM10944.pdf section 4.2.17 AVB Parameters:
+ * Structure of the meta-data follow-up frame.
+ * It is in network byte order, so there are no quirks
+ * while unpacking the meta frame.
+ *
+ * Also SJA1105 E/T only populates bits 23:0 of the timestamp
+ * whereas P/Q/R/S does 32 bits. Since the structure is the
+ * same and the E/T puts zeroes in the high-order byte, use
+ * a unified unpacking command for both device series.
+ */
+ packing(buf, &meta->tstamp, 31, 0, 4, UNPACK, 0);
+ packing(buf + 4, &meta->dmac_byte_4, 7, 0, 1, UNPACK, 0);
+ packing(buf + 5, &meta->dmac_byte_3, 7, 0, 1, UNPACK, 0);
+ packing(buf + 6, &meta->source_port, 7, 0, 1, UNPACK, 0);
+ packing(buf + 7, &meta->switch_id, 7, 0, 1, UNPACK, 0);
+}
+
static inline bool sja1105_is_meta_frame(const struct sk_buff *skb)
{
const struct ethhdr *hdr = eth_hdr(skb);
@@ -40,14 +70,15 @@ static inline bool sja1105_is_meta_frame(const struct sk_buff *skb)
}
/* This is the first time the tagger sees the frame on RX.
- * Figure out if we can decode it, and if we can, annotate skb->cb with how we
- * plan to do that, so we don't need to check again in the rcv function.
+ * Figure out if we can decode it.
*/
static bool sja1105_filter(const struct sk_buff *skb, struct net_device *dev)
{
+ if (!dsa_port_is_vlan_filtering(dev->dsa_ptr))
+ return true;
if (sja1105_is_link_local(skb))
return true;
- if (!dsa_port_is_vlan_filtering(dev->dsa_ptr))
+ if (sja1105_is_meta_frame(skb))
return true;
return false;
}
@@ -83,16 +114,19 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
struct net_device *netdev,
struct packet_type *pt)
{
+ struct sja1105_meta meta = {0};
int source_port, switch_id;
struct vlan_ethhdr *hdr;
u16 tpid, vid, tci;
bool is_link_local;
bool is_tagged;
+ bool is_meta;
hdr = vlan_eth_hdr(skb);
tpid = ntohs(hdr->h_vlan_proto);
is_tagged = (tpid == ETH_P_SJA1105);
is_link_local = sja1105_is_link_local(skb);
+ is_meta = sja1105_is_meta_frame(skb);
skb->offload_fwd_mark = 1;
@@ -113,6 +147,10 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
/* Clear the DMAC bytes that were mangled by the switch */
hdr->h_dest[3] = 0;
hdr->h_dest[4] = 0;
+ } else if (is_meta) {
+ sja1105_meta_unpack(skb, &meta);
+ source_port = meta.source_port;
+ switch_id = meta.switch_id;
} else {
return NULL;
}
This adds support in the tagger for understanding the source port and switch id of meta frames. Their timestamp is also extracted but not used yet - this needs to be done in a state machine that modifies the previously received timestampable frame - will be added in a follow-up patch. Also take the opportunity to: - Remove a comment in sja1105_filter made obsolete by e8d67fa5696e ("net: dsa: sja1105: Don't store frame type in skb->cb") - Reorder the checks in sja1105_filter to optimize for the most likely scenario first: regular traffic. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> --- Changes in v4: See last paragraph from the commit message. Changes in v3: Split from previous 09/10 patch (no functional changes). Changes in v2: None. net/dsa/tag_sja1105.c | 44 ++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 41 insertions(+), 3 deletions(-)