scsi: lpfc: Create a sysfs entry called lpfc_xcvr_data for transceiver info

The DUMP_MEMORY mailbox command is implemented for page A0 and A2 to
retrieve transceiver information from firmware.

The mailbox command output is then formatted to print raw data values for
userspace to parse via sysfs.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20221017164323.14536-4-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 128 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 863b2125fed6..2b03210264bb 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -7190,6 +7190,134 @@ rdp_fail:
 	return 1;
 }
 
+int lpfc_get_sfp_info_wait(struct lpfc_hba *phba,
+			   struct lpfc_rdp_context *rdp_context)
+{
+	LPFC_MBOXQ_t *mbox = NULL;
+	int rc;
+	struct lpfc_dmabuf *mp;
+	struct lpfc_dmabuf *mpsave;
+	void *virt;
+	MAILBOX_t *mb;
+
+	mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+	if (!mbox) {
+		lpfc_printf_log(phba, KERN_WARNING, LOG_MBOX | LOG_ELS,
+				"7205 failed to allocate mailbox memory");
+		return 1;
+	}
+
+	if (lpfc_sli4_dump_page_a0(phba, mbox))
+		goto sfp_fail;
+	mp = mbox->ctx_buf;
+	mpsave = mp;
+	virt = mp->virt;
+	if (phba->sli_rev < LPFC_SLI_REV4) {
+		mb = &mbox->u.mb;
+		mb->un.varDmp.cv = 1;
+		mb->un.varDmp.co = 1;
+		mb->un.varWords[2] = 0;
+		mb->un.varWords[3] = DMP_SFF_PAGE_A0_SIZE / 4;
+		mb->un.varWords[4] = 0;
+		mb->un.varWords[5] = 0;
+		mb->un.varWords[6] = 0;
+		mb->un.varWords[7] = 0;
+		mb->un.varWords[8] = 0;
+		mb->un.varWords[9] = 0;
+		mb->un.varWords[10] = 0;
+		mbox->in_ext_byte_len = DMP_SFF_PAGE_A0_SIZE;
+		mbox->out_ext_byte_len = DMP_SFF_PAGE_A0_SIZE;
+		mbox->mbox_offset_word = 5;
+		mbox->ctx_buf = virt;
+	} else {
+		bf_set(lpfc_mbx_memory_dump_type3_length,
+		       &mbox->u.mqe.un.mem_dump_type3, DMP_SFF_PAGE_A0_SIZE);
+		mbox->u.mqe.un.mem_dump_type3.addr_lo = putPaddrLow(mp->phys);
+		mbox->u.mqe.un.mem_dump_type3.addr_hi = putPaddrHigh(mp->phys);
+	}
+	mbox->vport = phba->pport;
+	mbox->ctx_ndlp = (struct lpfc_rdp_context *)rdp_context;
+
+	rc = lpfc_sli_issue_mbox_wait(phba, mbox, 30);
+	if (rc == MBX_NOT_FINISHED) {
+		rc = 1;
+		goto error;
+	}
+
+	if (phba->sli_rev == LPFC_SLI_REV4)
+		mp = (struct lpfc_dmabuf *)(mbox->ctx_buf);
+	else
+		mp = mpsave;
+
+	if (bf_get(lpfc_mqe_status, &mbox->u.mqe)) {
+		rc = 1;
+		goto error;
+	}
+
+	lpfc_sli_bemem_bcopy(mp->virt, &rdp_context->page_a0,
+			     DMP_SFF_PAGE_A0_SIZE);
+
+	memset(mbox, 0, sizeof(*mbox));
+	memset(mp->virt, 0, DMP_SFF_PAGE_A2_SIZE);
+	INIT_LIST_HEAD(&mp->list);
+
+	/* save address for completion */
+	mbox->ctx_buf = mp;
+	mbox->vport = phba->pport;
+
+	bf_set(lpfc_mqe_command, &mbox->u.mqe, MBX_DUMP_MEMORY);
+	bf_set(lpfc_mbx_memory_dump_type3_type,
+	       &mbox->u.mqe.un.mem_dump_type3, DMP_LMSD);
+	bf_set(lpfc_mbx_memory_dump_type3_link,
+	       &mbox->u.mqe.un.mem_dump_type3, phba->sli4_hba.physical_port);
+	bf_set(lpfc_mbx_memory_dump_type3_page_no,
+	       &mbox->u.mqe.un.mem_dump_type3, DMP_PAGE_A2);
+	if (phba->sli_rev < LPFC_SLI_REV4) {
+		mb = &mbox->u.mb;
+		mb->un.varDmp.cv = 1;
+		mb->un.varDmp.co = 1;
+		mb->un.varWords[2] = 0;
+		mb->un.varWords[3] = DMP_SFF_PAGE_A2_SIZE / 4;
+		mb->un.varWords[4] = 0;
+		mb->un.varWords[5] = 0;
+		mb->un.varWords[6] = 0;
+		mb->un.varWords[7] = 0;
+		mb->un.varWords[8] = 0;
+		mb->un.varWords[9] = 0;
+		mb->un.varWords[10] = 0;
+		mbox->in_ext_byte_len = DMP_SFF_PAGE_A2_SIZE;
+		mbox->out_ext_byte_len = DMP_SFF_PAGE_A2_SIZE;
+		mbox->mbox_offset_word = 5;
+		mbox->ctx_buf = virt;
+	} else {
+		bf_set(lpfc_mbx_memory_dump_type3_length,
+		       &mbox->u.mqe.un.mem_dump_type3, DMP_SFF_PAGE_A2_SIZE);
+		mbox->u.mqe.un.mem_dump_type3.addr_lo = putPaddrLow(mp->phys);
+		mbox->u.mqe.un.mem_dump_type3.addr_hi = putPaddrHigh(mp->phys);
+	}
+
+	mbox->ctx_ndlp = (struct lpfc_rdp_context *)rdp_context;
+	rc = lpfc_sli_issue_mbox_wait(phba, mbox, 30);
+	if (bf_get(lpfc_mqe_status, &mbox->u.mqe)) {
+		rc = 1;
+		goto error;
+	}
+	rc = 0;
+
+	lpfc_sli_bemem_bcopy(mp->virt, &rdp_context->page_a2,
+			     DMP_SFF_PAGE_A2_SIZE);
+
+error:
+	mbox->ctx_buf = mpsave;
+	lpfc_mbox_rsrc_cleanup(phba, mbox, MBOX_THD_UNLOCKED);
+
+	return rc;
+
+sfp_fail:
+	mempool_free(mbox, phba->mbox_mem_pool);
+	return 1;
+}
+
 /*
  * lpfc_els_rcv_rdp - Process an unsolicited RDP ELS.
  * @vport: pointer to a host virtual N_Port data structure.