datapath: Remove skb->len >= ETH_HLEN check from flow_extract().

The callers ensure that this is already the case.

Signed-off-by: Ben Pfaff <blp@nicira.com>

diff --git a/datapath/flow.c b/datapath/flow.c
index a64152b..7b1f23b 100644 (file)
--- a/datapath/flow.c
+++ b/datapath/flow.c
@@ -219,9 +219,17 @@ static __be16 parse_ethertype(struct sk_buff *skb)
        return llc->ethertype;
 }
 
-/* Parses the Ethernet frame in 'skb', which was received on 'in_port',
- * and initializes 'key' to match.  Returns 1 if 'skb' contains an IP
- * fragment, 0 otherwise. */
+/**
+ * flow_extract - extracts a flow key from an Ethernet frame.
+ * @skb: sk_buff that contains the frame, with skb->data pointing to the
+ * Ethernet header
+ * @in_port: port number on which @skb was received.
+ * @key: output flow key
+ *
+ * The caller must ensure that skb->len >= ETH_HLEN.
+ *
+ * Returns 1 if @skb contains an IPv4 fragment, 0 otherwise.
+ */
 int flow_extract(struct sk_buff *skb, u16 in_port, struct odp_flow_key *key)
 {
        struct ethhdr *eth;
@@ -232,8 +240,6 @@ int flow_extract(struct sk_buff *skb, u16 in_port, struct odp_flow_key *key)
        key->in_port = in_port;
        key->dl_vlan = htons(ODP_VLAN_NONE);
 
-       if (skb->len < sizeof *eth)
-               return 0;
        if (!pskb_may_pull(skb, min(skb->len, 64u)))
                return 0;