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scsi: mpt3sas: Introduce struct mpt3sas_nvme_cmd 

Make _base_build_nvme_prp() easier to read by introducing a structure
to access NVMe command fields.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Sathya Prakash <sathya.prakash@broadcom.com>
Cc: Chaitra P B <chaitra.basappa@broadcom.com>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2018-06-15 14:41:57 -07:00 committed by Martin K. Petersen
parent eb0c7af26b
commit 84203b3561
2 changed files with 9 additions and 11 deletions
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13
drivers/scsi/mpt3sas/mpt3sas_base.c
View File

@ -1864,6 +1864,8 @@ _base_build_nvme_prp(struct MPT3SAS_ADAPTER *ioc, u16 smid,
u32 offset, entry_len;
u32 page_mask_result, page_mask;
size_t length;
struct mpt3sas_nvme_cmd *nvme_cmd =
(void *)nvme_encap_request->NVMe_Command;
/*
* Not all commands require a data transfer. If no data, just return
@ -1871,15 +1873,8 @@ _base_build_nvme_prp(struct MPT3SAS_ADAPTER *ioc, u16 smid,
*/
if (!data_in_sz && !data_out_sz)
return;
/*
* Set pointers to PRP1 and PRP2, which are in the NVMe command.
* PRP1 is located at a 24 byte offset from the start of the NVMe
* command. Then set the current PRP entry pointer to PRP1.
*/
prp1_entry = (__le64 *)(nvme_encap_request->NVMe_Command +
NVME_CMD_PRP1_OFFSET);
prp2_entry = (__le64 *)(nvme_encap_request->NVMe_Command +
NVME_CMD_PRP2_OFFSET);
prp1_entry = &nvme_cmd->prp1;
prp2_entry = &nvme_cmd->prp2;
prp_entry = prp1_entry;
/*
* For the PRP entries, use the specially allocated buffer of

7
drivers/scsi/mpt3sas/mpt3sas_base.h
View File

@ -143,14 +143,17 @@
* NVMe defines
*/
#define NVME_PRP_SIZE 8 /* PRP size */
#define NVME_CMD_PRP1_OFFSET 24 /* PRP1 offset in NVMe cmd */
#define NVME_CMD_PRP2_OFFSET 32 /* PRP2 offset in NVMe cmd */
#define NVME_ERROR_RESPONSE_SIZE 16 /* Max NVME Error Response */
#define NVME_TASK_ABORT_MIN_TIMEOUT 6
#define NVME_TASK_ABORT_MAX_TIMEOUT 60
#define NVME_TASK_MNGT_CUSTOM_MASK (0x0010)
#define NVME_PRP_PAGE_SIZE 4096 /* Page size */
struct mpt3sas_nvme_cmd {
u8 rsvd[24];
__le64 prp1;
__le64 prp2;
};
/*
* reset phases