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net/smc: Use static_assert() to check struct sizes

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Commit 9748dbc9f2 ("net/smc: Avoid -Wflex-array-member-not-at-end
warnings") introduced tagged `struct smc_clc_v2_extension_fixed` and
`struct smc_clc_smcd_v2_extension_fixed`. We want to ensure that when
new members need to be added to the flexible structures, they are
always included within these tagged structs.

So, we use `static_assert()` to ensure that the memory layout for
both the flexible structure and the tagged struct is the same after
any changes.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Jan Karcher <jaka@linux.ibm.com>
Link: https://patch.msgid.link/ZrVBuiqFHAORpFxE@cute
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2024-08-08 16:07:54 -06:00 committed by Jakub Kicinski
parent 46dd90fe51
commit 0a3e6939d4
1 changed files with 4 additions and 0 deletions
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4
net/smc/smc_clc.h
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@ -145,6 +145,8 @@ struct smc_clc_v2_extension {
); );
u8 user_eids[][SMC_MAX_EID_LEN]; u8 user_eids[][SMC_MAX_EID_LEN];
}; };
static_assert(offsetof(struct smc_clc_v2_extension, user_eids) == sizeof(struct smc_clc_v2_extension_fixed),
"struct member likely outside of struct_group_tagged()");
struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/ struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/
__be32 outgoing_subnet; /* subnet mask */ __be32 outgoing_subnet; /* subnet mask */
@ -169,6 +171,8 @@ struct smc_clc_smcd_v2_extension {
); );
struct smc_clc_smcd_gid_chid gidchid[]; struct smc_clc_smcd_gid_chid gidchid[];
}; };
static_assert(offsetof(struct smc_clc_smcd_v2_extension, gidchid) == sizeof(struct smc_clc_smcd_v2_extension_fixed),
"struct member likely outside of struct_group_tagged()");
struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */ struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */
struct smc_clc_msg_hdr hdr; struct smc_clc_msg_hdr hdr;