net: prp: add supervision frame generation utility function

Add support for generation of PRP supervision frames. For PRP,
supervision frame format is similar to HSR version 0, but have
a PRP Redundancy Control Trailer (RCT) added and uses a different
message type, PRP_TLV_LIFE_CHECK_DD. Also update
is_supervision_frame() to include the new message type used for
PRP supervision frame.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index 006e715..74eaf28 100644 (file)
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -238,6 +238,10 @@ static struct sk_buff *hsr_init_skb(struct hsr_port *master, u16 proto)
 
        hlen = LL_RESERVED_SPACE(master->dev);
        tlen = master->dev->needed_tailroom;
+       /* skb size is same for PRP/HSR frames, only difference
+        * being, for PRP it is a trailer and for HSR it is a
+        * header
+        */
        skb = dev_alloc_skb(sizeof(struct hsr_tag) +
                            sizeof(struct hsr_sup_tag) +
                            sizeof(struct hsr_sup_payload) + hlen + tlen);
@@ -336,6 +340,55 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
        return;
 }
 
+static void send_prp_supervision_frame(struct hsr_port *master,
+                                      unsigned long *interval)
+{
+       struct hsr_priv *hsr = master->hsr;
+       struct hsr_sup_payload *hsr_sp;
+       struct hsr_sup_tag *hsr_stag;
+       unsigned long irqflags;
+       struct sk_buff *skb;
+       struct prp_rct *rct;
+       u8 *tail;
+
+       skb = hsr_init_skb(master, ETH_P_PRP);
+       if (!skb) {
+               WARN_ONCE(1, "PRP: Could not send supervision frame\n");
+               return;
+       }
+
+       *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
+       hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
+       set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
+       set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0));
+
+       /* From HSRv1 on we have separate supervision sequence numbers. */
+       spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
+       hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
+       hsr->sup_sequence_nr++;
+       hsr_stag->HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD;
+       hsr_stag->HSR_TLV_length = sizeof(struct hsr_sup_payload);
+
+       /* Payload: MacAddressA */
+       hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
+       ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
+
+       if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN)) {
+               spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
+               return;
+       }
+
+       tail = skb_tail_pointer(skb) - HSR_HLEN;
+       rct = (struct prp_rct *)tail;
+       rct->PRP_suffix = htons(ETH_P_PRP);
+       set_prp_LSDU_size(rct, HSR_V1_SUP_LSDUSIZE);
+       rct->sequence_nr = htons(hsr->sequence_nr);
+       hsr->sequence_nr++;
+       spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
+
+       hsr_forward_skb(skb, master);
+}
+
 /* Announce (supervision frame) timer function
  */
 static void hsr_announce(struct timer_list *t)
@@ -389,6 +442,10 @@ static struct hsr_proto_ops hsr_ops = {
        .send_sv_frame = send_hsr_supervision_frame,
 };
 
+struct hsr_proto_ops prp_ops = {
+       .send_sv_frame = send_prp_supervision_frame,
+};
+
 void hsr_dev_setup(struct net_device *dev)
 {
        eth_hw_addr_random(dev);
@@ -452,7 +509,12 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
        if (protocol_version == PRP_V1)
                return -EPROTONOSUPPORT;
 
-       hsr->proto_ops = &hsr_ops;
+       /* initialize protocol specific functions */
+       if (protocol_version == PRP_V1)
+               hsr->proto_ops = &prp_ops;
+       else
+               hsr->proto_ops = &hsr_ops;
+
        /* Make sure we recognize frames from ourselves in hsr_rcv() */
        res = hsr_create_self_node(hsr, hsr_dev->dev_addr,
                                   slave[1]->dev_addr);

diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c
index 55adb4d..dedf8ac 100644 (file)
--- a/net/hsr/hsr_forward.c
+++ b/net/hsr/hsr_forward.c
@@ -76,7 +76,9 @@ static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
        }
 
        if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE &&
-           hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK)
+           hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK &&
+           hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DD &&
+           hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DA)
                return false;
        if (hsr_sup_tag->HSR_TLV_length != 12 &&
            hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload))

diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 6712701..58e1ad2 100644 (file)
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -35,6 +35,10 @@
 
 #define HSR_TLV_ANNOUNCE                  22
 #define HSR_TLV_LIFE_CHECK                23
+/* PRP V1 life check for Duplicate discard */
+#define PRP_TLV_LIFE_CHECK_DD             20
+/* PRP V1 life check for Duplicate Accept */
+#define PRP_TLV_LIFE_CHECK_DA             21
 
 /* HSR Tag.
  * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
@@ -126,6 +130,24 @@ enum hsr_port_type {
        HSR_PT_PORTS,   /* This must be the last item in the enum */
 };
 
+/* PRP Redunancy Control Trailor (RCT).
+ * As defined in IEC-62439-4:2012, the PRP RCT is really { sequence Nr,
+ * Lan indentifier (LanId), LSDU_size and PRP_suffix = 0x88FB }.
+ *
+ * Field names as defined in the IEC:2012 standard for PRP.
+ */
+struct prp_rct {
+       __be16          sequence_nr;
+       __be16          lan_id_and_LSDU_size;
+       __be16          PRP_suffix;
+} __packed;
+
+static inline void set_prp_LSDU_size(struct prp_rct *rct, u16 LSDU_size)
+{
+       rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) &
+                                         0xF000) | (LSDU_size & 0x0FFF));
+}
+
 struct hsr_port {
        struct list_head        port_list;
        struct net_device       *dev;