ip_tunnel: convert __be16 tunnel flags to bitmaps

Historically, tunnel flags like TUNNEL_CSUM or TUNNEL_ERSPAN_OPT
have been defined as __be16. Now all of those 16 bits are occupied
and there's no more free space for new flags.
It can't be simply switched to a bigger container with no
adjustments to the values, since it's an explicit Endian storage,
and on LE systems (__be16)0x0001 equals to
(__be64)0x0001000000000000.
We could probably define new 64-bit flags depending on the
Endianness, i.e. (__be64)0x0001 on BE and (__be64)0x00010000... on
LE, but that would introduce an Endianness dependency and spawn a
ton of Sparse warnings. To mitigate them, all of those places which
were adjusted with this change would be touched anyway, so why not
define stuff properly if there's no choice.

Define IP_TUNNEL_*_BIT counterparts as a bit number instead of the
value already coded and a fistful of <16 <-> bitmap> converters and
helpers. The two flags which have a different bit position are
SIT_ISATAP_BIT and VTI_ISVTI_BIT, as they were defined not as
__cpu_to_be16(), but as (__force __be16), i.e. had different
positions on LE and BE. Now they both have strongly defined places.
Change all __be16 fields which were used to store those flags, to
IP_TUNNEL_DECLARE_FLAGS() -> DECLARE_BITMAP(__IP_TUNNEL_FLAG_NUM) ->
unsigned long[1] for now, and replace all TUNNEL_* occurrences to
their bitmap counterparts. Use the converters in the places which talk
to the userspace, hardware (NFP) or other hosts (GRE header). The rest
must explicitly use the new flags only. This must be done at once,
otherwise there will be too many conversions throughout the code in
the intermediate commits.
Finally, disable the old __be16 flags for use in the kernel code
(except for the two 'irregular' flags mentioned above), to prevent
any accidental (mis)use of them. For the userspace, nothing is
changed, only additions were made.

Most noticeable bloat-o-meter difference (.text):

vmlinux:	307/-1 (306)
gre.ko:		62/0 (62)
ip_gre.ko:	941/-217 (724)	[*]
ip_tunnel.ko:	390/-900 (-510)	[**]
ip_vti.ko:	138/0 (138)
ip6_gre.ko:	534/-18 (516)	[*]
ip6_tunnel.ko:	118/-10 (108)

[*] gre_flags_to_tnl_flags() grew, but still is inlined
[**] ip_tunnel_find() got uninlined, hence such decrease

The average code size increase in non-extreme case is 100-200 bytes
per module, mostly due to sizeof(long) > sizeof(__be16), as
%__IP_TUNNEL_FLAG_NUM is less than %BITS_PER_LONG and the compilers
are able to expand the majority of bitmap_*() calls here into direct
operations on scalars.

Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 10 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
index d67df358a52f..d761a1235994 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
@@ -27,23 +27,23 @@ mlxsw_sp_ipip_netdev_parms6(const struct net_device *ol_dev)
 static bool
 mlxsw_sp_ipip_parms4_has_ikey(const struct ip_tunnel_parm_kern *parms)
 {
-	return !!(parms->i_flags & TUNNEL_KEY);
+	return test_bit(IP_TUNNEL_KEY_BIT, parms->i_flags);
 }
 
 static bool mlxsw_sp_ipip_parms6_has_ikey(const struct __ip6_tnl_parm *parms)
 {
-	return !!(parms->i_flags & TUNNEL_KEY);
+	return test_bit(IP_TUNNEL_KEY_BIT, parms->i_flags);
 }
 
 static bool
 mlxsw_sp_ipip_parms4_has_okey(const struct ip_tunnel_parm_kern *parms)
 {
-	return !!(parms->o_flags & TUNNEL_KEY);
+	return test_bit(IP_TUNNEL_KEY_BIT, parms->o_flags);
 }
 
 static bool mlxsw_sp_ipip_parms6_has_okey(const struct __ip6_tnl_parm *parms)
 {
-	return !!(parms->o_flags & TUNNEL_KEY);
+	return test_bit(IP_TUNNEL_KEY_BIT, parms->o_flags);
 }
 
 static u32 mlxsw_sp_ipip_parms4_ikey(const struct ip_tunnel_parm_kern *parms)
@@ -242,12 +242,15 @@ static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp,
 					   const struct net_device *ol_dev)
 {
 	struct ip_tunnel *tunnel = netdev_priv(ol_dev);
-	__be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
 	bool inherit_ttl = tunnel->parms.iph.ttl == 0;
 	bool inherit_tos = tunnel->parms.iph.tos & 0x1;
+	IP_TUNNEL_DECLARE_FLAGS(okflags) = { };
 
-	return (tunnel->parms.i_flags & ~okflags) == 0 &&
-	       (tunnel->parms.o_flags & ~okflags) == 0 &&
+	/* We can't offload any other features. */
+	__set_bit(IP_TUNNEL_KEY_BIT, okflags);
+
+	return ip_tunnel_flags_subset(tunnel->parms.i_flags, okflags) &&
+	       ip_tunnel_flags_subset(tunnel->parms.o_flags, okflags) &&
 	       inherit_ttl && inherit_tos &&
 	       mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev);
 }
@@ -443,10 +446,13 @@ static bool mlxsw_sp_ipip_can_offload_gre6(const struct mlxsw_sp *mlxsw_sp,
 	struct __ip6_tnl_parm tparm = mlxsw_sp_ipip_netdev_parms6(ol_dev);
 	bool inherit_tos = tparm.flags & IP6_TNL_F_USE_ORIG_TCLASS;
 	bool inherit_ttl = tparm.hop_limit == 0;
-	__be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
+	IP_TUNNEL_DECLARE_FLAGS(okflags) = { };
+
+	/* We can't offload any other features. */
+	__set_bit(IP_TUNNEL_KEY_BIT, okflags);
 
-	return (tparm.i_flags & ~okflags) == 0 &&
-	       (tparm.o_flags & ~okflags) == 0 &&
+	return ip_tunnel_flags_subset(tparm.i_flags, okflags) &&
+	       ip_tunnel_flags_subset(tparm.o_flags, okflags) &&
 	       inherit_ttl && inherit_tos &&
 	       mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV6, ol_dev);
 }