Revert "openvswitch: Add erspan tunnel support."

This reverts commit ceaa001a170e43608854d5290a48064f57b565ed.

The OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS attr should be designed
as a nested attribute to support all ERSPAN v1 and v2's fields.
The current attr is a be32 supporting only one field. Thus, this
patch reverts it and later patch will redo it using nested attr.

Signed-off-by: William Tu <[e-mail]>
Cc: Jiri Benc <[e-mail]>
Cc: Pravin Shelar <[e-mail]>
Acked-by: Jiri Benc <[e-mail]>
Acked-by: Pravin B Shelar <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/uapi/linux/openvswitch.h

···
 	OVS_TUNNEL_KEY_ATTR_IPV6_SRC,		/* struct in6_addr src IPv6 address. */
 	OVS_TUNNEL_KEY_ATTR_IPV6_DST,		/* struct in6_addr dst IPv6 address. */
 	OVS_TUNNEL_KEY_ATTR_PAD,
-	OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,	/* be32 ERSPAN index. */
 	__OVS_TUNNEL_KEY_ATTR_MAX
 };
 

net/openvswitch/flow_netlink.c

···
 #include <net/mpls.h>
 #include <net/vxlan.h>
 #include <net/tun_proto.h>
-#include <net/erspan.h>
 
 #include "flow_netlink.h"
 
···
 		 * OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
 		 */
 		+ nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
-		+ nla_total_size(2)    /* OVS_TUNNEL_KEY_ATTR_TP_DST */
-		+ nla_total_size(4);   /* OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS */
+		+ nla_total_size(2);   /* OVS_TUNNEL_KEY_ATTR_TP_DST */
 }
 
 static size_t ovs_nsh_key_attr_size(void)
···
 						.next = ovs_vxlan_ext_key_lens },
 	[OVS_TUNNEL_KEY_ATTR_IPV6_SRC]      = { .len = sizeof(struct in6_addr) },
 	[OVS_TUNNEL_KEY_ATTR_IPV6_DST]      = { .len = sizeof(struct in6_addr) },
-	[OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS]   = { .len = sizeof(u32) },
 };
 
 static const struct ovs_len_tbl
···
 	return 0;
 }
 
-static int erspan_tun_opt_from_nlattr(const struct nlattr *attr,
-				      struct sw_flow_match *match, bool is_mask,
-				      bool log)
-{
-	unsigned long opt_key_offset;
-	struct erspan_metadata opts;
-
-	BUILD_BUG_ON(sizeof(opts) > sizeof(match->key->tun_opts));
-
-	memset(&opts, 0, sizeof(opts));
-	opts.index = nla_get_be32(attr);
-
-	/* Index has only 20-bit */
-	if (ntohl(opts.index) & ~INDEX_MASK) {
-		OVS_NLERR(log, "ERSPAN index number %x too large.",
-			  ntohl(opts.index));
-		return -EINVAL;
-	}
-
-	SW_FLOW_KEY_PUT(match, tun_opts_len, sizeof(opts), is_mask);
-	opt_key_offset = TUN_METADATA_OFFSET(sizeof(opts));
-	SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, &opts, sizeof(opts),
-				  is_mask);
-
-	return 0;
-}
-
 static int ip_tun_from_nlattr(const struct nlattr *attr,
 			      struct sw_flow_match *match, bool is_mask,
 			      bool log)
···
 			opts_type = type;
 			break;
 		case OVS_TUNNEL_KEY_ATTR_PAD:
-			break;
-		case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
-			if (opts_type) {
-				OVS_NLERR(log, "Multiple metadata blocks provided");
-				return -EINVAL;
-			}
-
-			err = erspan_tun_opt_from_nlattr(a, match, is_mask, log);
-			if (err)
-				return err;
-
-			tun_flags |= TUNNEL_ERSPAN_OPT;
-			opts_type = type;
 			break;
 		default:
 			OVS_NLERR(log, "Unknown IP tunnel attribute %d",
···
 			return -EMSGSIZE;
 		else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
 			 vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
-			return -EMSGSIZE;
-		else if (output->tun_flags & TUNNEL_ERSPAN_OPT &&
-			 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,
-				      ((struct erspan_metadata *)tun_opts)->index))
 			return -EMSGSIZE;
 	}
 
···
 				return err;
 			break;
 		case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
-			break;
-		case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
 			break;
 		}
 	};