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RDMA/srp: Apply the __packed attribute to members instead of structures 

Applying the __packed attribute to an entire data structure results in
suboptimal code on architectures that do not support unaligned accesses.
Hence apply the __packed attribute only to those data members that are
not naturally aligned.

Link: https://lore.kernel.org/r/20210524041211.9480-4-bvanassche@acm.org
Cc: Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Bart Van Assche 2021-05-23 21:12:09 -07:00 committed by Jason Gunthorpe
parent c838de1af1
commit 6dc26498e1
1 changed files with 9 additions and 17 deletions
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26
include/scsi/srp.h
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@ -107,10 +107,10 @@ struct srp_direct_buf {
* having the 20-byte structure padded to 24 bytes on 64-bit architectures.
*/
struct srp_indirect_buf {
struct srp_direct_buf table_desc;
struct srp_direct_buf table_desc __packed __aligned(4);
__be32 len;
struct srp_direct_buf desc_list[];
} __attribute__((packed));
struct srp_direct_buf desc_list[] __packed __aligned(4);
};
/* Immediate data buffer descriptor as defined in SRP2. */
struct srp_imm_buf {
@ -175,13 +175,13 @@ struct srp_login_rsp {
u8 opcode;
u8 reserved1[3];
__be32 req_lim_delta;
u64 tag;
u64 tag __packed __aligned(4);
__be32 max_it_iu_len;
__be32 max_ti_iu_len;
__be16 buf_fmt;
u8 rsp_flags;
u8 reserved2[25];
} __attribute__((packed));
};
struct srp_login_rej {
u8 opcode;
@ -207,10 +207,6 @@ struct srp_t_logout {
u64 tag;
};
/*
* We need the packed attribute because the SRP spec only aligns the
* 8-byte LUN field to 4 bytes.
*/
struct srp_tsk_mgmt {
u8 opcode;
u8 sol_not;
@ -225,10 +221,6 @@ struct srp_tsk_mgmt {
u8 reserved5[8];
};
/*
* We need the packed attribute because the SRP spec only aligns the
* 8-byte LUN field to 4 bytes.
*/
struct srp_cmd {
u8 opcode;
u8 sol_not;
@ -266,7 +258,7 @@ struct srp_rsp {
u8 sol_not;
u8 reserved1[2];
__be32 req_lim_delta;
u64 tag;
u64 tag __packed __aligned(4);
u8 reserved2[2];
u8 flags;
u8 status;
@ -275,7 +267,7 @@ struct srp_rsp {
__be32 sense_data_len;
__be32 resp_data_len;
u8 data[];
} __attribute__((packed));
};
struct srp_cred_req {
u8 opcode;
@ -301,13 +293,13 @@ struct srp_aer_req {
u8 sol_not;
u8 reserved[2];
__be32 req_lim_delta;
u64 tag;
u64 tag __packed __aligned(4);
u32 reserved2;
struct scsi_lun lun;
__be32 sense_data_len;
u32 reserved3;
u8 sense_data[];
} __attribute__((packed));
};
struct srp_aer_rsp {
u8 opcode;