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authorAlexander Lobakin <aleksander.lobakin@intel.com>2024-03-27 16:23:53 +0100
committerDavid S. Miller <davem@davemloft.net>2024-04-01 10:49:28 +0100
commit5832c4a77d6931cebf9ba737129ae8f14b66ee1d (patch)
tree0784ac7a32ef184eede2cb90e89d5337a018eb8a /net/sched/cls_flower.c
parent117aef12a7b1b797bce9f66b156c65eab850b5b5 (diff)
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>
Diffstat (limited to 'net/sched/cls_flower.c')
-rw-r--r--net/sched/cls_flower.c27
1 files changed, 14 insertions, 13 deletions
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index e1314674b4a9..ae14d649140f 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1454,12 +1454,13 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
switch (nla_type(nla_opt_key)) {
case TCA_FLOWER_KEY_ENC_OPTS_GENEVE:
if (key->enc_opts.dst_opt_type &&
- key->enc_opts.dst_opt_type != TUNNEL_GENEVE_OPT) {
+ key->enc_opts.dst_opt_type !=
+ IP_TUNNEL_GENEVE_OPT_BIT) {
NL_SET_ERR_MSG(extack, "Duplicate type for geneve options");
return -EINVAL;
}
option_len = 0;
- key->enc_opts.dst_opt_type = TUNNEL_GENEVE_OPT;
+ key->enc_opts.dst_opt_type = IP_TUNNEL_GENEVE_OPT_BIT;
option_len = fl_set_geneve_opt(nla_opt_key, key,
key_depth, option_len,
extack);
@@ -1470,7 +1471,7 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
/* At the same time we need to parse through the mask
* in order to verify exact and mask attribute lengths.
*/
- mask->enc_opts.dst_opt_type = TUNNEL_GENEVE_OPT;
+ mask->enc_opts.dst_opt_type = IP_TUNNEL_GENEVE_OPT_BIT;
option_len = fl_set_geneve_opt(nla_opt_msk, mask,
msk_depth, option_len,
extack);
@@ -1489,7 +1490,7 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
return -EINVAL;
}
option_len = 0;
- key->enc_opts.dst_opt_type = TUNNEL_VXLAN_OPT;
+ key->enc_opts.dst_opt_type = IP_TUNNEL_VXLAN_OPT_BIT;
option_len = fl_set_vxlan_opt(nla_opt_key, key,
key_depth, option_len,
extack);
@@ -1500,7 +1501,7 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
/* At the same time we need to parse through the mask
* in order to verify exact and mask attribute lengths.
*/
- mask->enc_opts.dst_opt_type = TUNNEL_VXLAN_OPT;
+ mask->enc_opts.dst_opt_type = IP_TUNNEL_VXLAN_OPT_BIT;
option_len = fl_set_vxlan_opt(nla_opt_msk, mask,
msk_depth, option_len,
extack);
@@ -1519,7 +1520,7 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
return -EINVAL;
}
option_len = 0;
- key->enc_opts.dst_opt_type = TUNNEL_ERSPAN_OPT;
+ key->enc_opts.dst_opt_type = IP_TUNNEL_ERSPAN_OPT_BIT;
option_len = fl_set_erspan_opt(nla_opt_key, key,
key_depth, option_len,
extack);
@@ -1530,7 +1531,7 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
/* At the same time we need to parse through the mask
* in order to verify exact and mask attribute lengths.
*/
- mask->enc_opts.dst_opt_type = TUNNEL_ERSPAN_OPT;
+ mask->enc_opts.dst_opt_type = IP_TUNNEL_ERSPAN_OPT_BIT;
option_len = fl_set_erspan_opt(nla_opt_msk, mask,
msk_depth, option_len,
extack);
@@ -1550,7 +1551,7 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
return -EINVAL;
}
option_len = 0;
- key->enc_opts.dst_opt_type = TUNNEL_GTP_OPT;
+ key->enc_opts.dst_opt_type = IP_TUNNEL_GTP_OPT_BIT;
option_len = fl_set_gtp_opt(nla_opt_key, key,
key_depth, option_len,
extack);
@@ -1561,7 +1562,7 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
/* At the same time we need to parse through the mask
* in order to verify exact and mask attribute lengths.
*/
- mask->enc_opts.dst_opt_type = TUNNEL_GTP_OPT;
+ mask->enc_opts.dst_opt_type = IP_TUNNEL_GTP_OPT_BIT;
option_len = fl_set_gtp_opt(nla_opt_msk, mask,
msk_depth, option_len,
extack);
@@ -3202,22 +3203,22 @@ static int fl_dump_key_options(struct sk_buff *skb, int enc_opt_type,
goto nla_put_failure;
switch (enc_opts->dst_opt_type) {
- case TUNNEL_GENEVE_OPT:
+ case IP_TUNNEL_GENEVE_OPT_BIT:
err = fl_dump_key_geneve_opt(skb, enc_opts);
if (err)
goto nla_put_failure;
break;
- case TUNNEL_VXLAN_OPT:
+ case IP_TUNNEL_VXLAN_OPT_BIT:
err = fl_dump_key_vxlan_opt(skb, enc_opts);
if (err)
goto nla_put_failure;
break;
- case TUNNEL_ERSPAN_OPT:
+ case IP_TUNNEL_ERSPAN_OPT_BIT:
err = fl_dump_key_erspan_opt(skb, enc_opts);
if (err)
goto nla_put_failure;
break;
- case TUNNEL_GTP_OPT:
+ case IP_TUNNEL_GTP_OPT_BIT:
err = fl_dump_key_gtp_opt(skb, enc_opts);
if (err)
goto nla_put_failure;