erspan: set bso bit based on mirrored packet's len (d48f1958) · Commits · 戴 / test

include/net/erspan.h

+28 −0

Original line number	Diff line number	Diff line
		@@ -219,6 +219,33 @@ static inline __be32 erspan_get_timestamp(void)
		return htonl((u32)h_usecs);
		}

		/* ERSPAN BSO (Bad/Short/Oversized), see RFC1757
		* 00b --> Good frame with no error, or unknown integrity
		* 01b --> Payload is a Short Frame
		* 10b --> Payload is an Oversized Frame
		* 11b --> Payload is a Bad Frame with CRC or Alignment Error
		*/
		enum erspan_bso {
		BSO_NOERROR = 0x0,
		BSO_SHORT = 0x1,
		BSO_OVERSIZED = 0x2,
		BSO_BAD = 0x3,
		};

		static inline u8 erspan_detect_bso(struct sk_buff *skb)
		{
		/* BSO_BAD is not handled because the frame CRC
		* or alignment error information is in FCS.
		*/
		if (skb->len < ETH_ZLEN)
		return BSO_SHORT;

		if (skb->len > ETH_FRAME_LEN)
		return BSO_OVERSIZED;

		return BSO_NOERROR;
		}

		static inline void erspan_build_header_v2(struct sk_buff *skb,
		u32 id, u8 direction, u16 hwid,
		bool truncate, bool is_ipv4)
		@@ -248,6 +275,7 @@ static inline void erspan_build_header_v2(struct sk_buff *skb,
		vlan_tci = ntohs(qp->tci);
		}

		bso = erspan_detect_bso(skb);
		skb_push(skb, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);
		ershdr = (struct erspan_base_hdr *)skb->data;
		memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);