Commit acbaa8c8 authored by James Smart's avatar James Smart Committed by Martin K. Petersen
Browse files

scsi: lpfc: Add bsg support for retrieving adapter cmf data 

Add a bsg ioctl to allow user applications to retrieve the adapter
congestion management framework buffer.

Link: https://lore.kernel.org/r/20210816162901.121235-15-jsmart2021@gmail.com


Co-developed-by: default avatarJustin Tee <justin.tee@broadcom.com>
Signed-off-by: default avatarJustin Tee <justin.tee@broadcom.com>
Signed-off-by: default avatarJames Smart <jsmart2021@gmail.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 74a7baa2

drivers/scsi/lpfc/lpfc_bsg.c

+89 −0
Original line number Diff line number Diff line
@@ -5751,6 +5751,92 @@ lpfc_get_trunk_info(struct bsg_job *job) 


}



static int

lpfc_get_cgnbuf_info(struct bsg_job *job)

{

	struct lpfc_vport *vport = shost_priv(fc_bsg_to_shost(job));

	struct lpfc_hba *phba = vport->phba;

	struct fc_bsg_request *bsg_request = job->request;

	struct fc_bsg_reply *bsg_reply = job->reply;

	struct get_cgnbuf_info_req *cgnbuf_req;

	struct lpfc_cgn_info *cp;

	uint8_t *cgn_buff;

	int size, cinfosz;

	int  rc = 0;



	if (job->request_len < sizeof(struct fc_bsg_request) +

	    sizeof(struct get_cgnbuf_info_req)) {

		rc = -ENOMEM;

		goto job_exit;

	}



	if (!phba->sli4_hba.pc_sli4_params.cmf) {

		rc = -ENOENT;

		goto job_exit;

	}



	if (!phba->cgn_i || !phba->cgn_i->virt) {

		rc = -ENOENT;

		goto job_exit;

	}



	cp = phba->cgn_i->virt;

	if (cp->cgn_info_version < LPFC_CGN_INFO_V3) {

		rc = -EPERM;

		goto job_exit;

	}



	cgnbuf_req = (struct get_cgnbuf_info_req *)

		bsg_request->rqst_data.h_vendor.vendor_cmd;



	/* For reset or size == 0 */

	bsg_reply->reply_payload_rcv_len = 0;



	if (cgnbuf_req->reset == LPFC_BSG_CGN_RESET_STAT) {

		lpfc_init_congestion_stat(phba);

		goto job_exit;

	}



	/* We don't want to include the CRC at the end */

	cinfosz = sizeof(struct lpfc_cgn_info) - sizeof(uint32_t);



	size = cgnbuf_req->read_size;

	if (!size)

		goto job_exit;



	if (size < cinfosz) {

		/* Just copy back what we can */

		cinfosz = size;

		rc = -E2BIG;

	}



	/* Allocate memory to read congestion info */

	cgn_buff = vmalloc(cinfosz);

	if (!cgn_buff) {

		rc = -ENOMEM;

		goto job_exit;

	}



	memcpy(cgn_buff, cp, cinfosz);



	bsg_reply->reply_payload_rcv_len =

		sg_copy_from_buffer(job->reply_payload.sg_list,

				    job->reply_payload.sg_cnt,

				    cgn_buff, cinfosz);



	vfree(cgn_buff);



job_exit:

	bsg_reply->result = rc;

	if (!rc)

		bsg_job_done(job, bsg_reply->result,

			     bsg_reply->reply_payload_rcv_len);

	else

		lpfc_printf_log(phba, KERN_ERR, LOG_LIBDFC,

				"2724 GET CGNBUF error: %d\n", rc);

	return rc;

}



/**

 * lpfc_bsg_hst_vendor - process a vendor-specific fc_bsg_job

 * @job: fc_bsg_job to handle
@@ -5813,6 +5899,9 @@ lpfc_bsg_hst_vendor(struct bsg_job *job) 
	case LPFC_BSG_VENDOR_GET_TRUNK_INFO:

		rc = lpfc_get_trunk_info(job);

		break;

	case LPFC_BSG_VENDOR_GET_CGNBUF_INFO:

		rc = lpfc_get_cgnbuf_info(job);

		break;

	default:

		rc = -EINVAL;

		bsg_reply->reply_payload_rcv_len = 0;

drivers/scsi/lpfc/lpfc_bsg.h

+8 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ 
#define LPFC_BSG_VENDOR_RAS_GET_CONFIG		18

#define LPFC_BSG_VENDOR_RAS_SET_CONFIG		19

#define LPFC_BSG_VENDOR_GET_TRUNK_INFO		20

#define LPFC_BSG_VENDOR_GET_CGNBUF_INFO		21



struct set_ct_event {

	uint32_t command;
@@ -386,6 +387,13 @@ struct get_trunk_info_req { 
	uint32_t command;

};



struct get_cgnbuf_info_req {

	uint32_t command;

	uint32_t read_size;

	uint32_t reset;

#define LPFC_BSG_CGN_RESET_STAT		1

};



/* driver only */

#define SLI_CONFIG_NOT_HANDLED		0

#define SLI_CONFIG_HANDLED		1