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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/lpfc/lpfc_attr.c

···
 	return 0;
 }
 
+static ssize_t
+lpfc_xcvr_data_show(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct Scsi_Host  *shost = class_to_shost(dev);
+	struct lpfc_vport *vport = (struct lpfc_vport *)shost->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+	int rc;
+	int len = 0;
+	struct lpfc_rdp_context	*rdp_context;
+	u16 temperature;
+	u16 rx_power;
+	u16 tx_bias;
+	u16 tx_power;
+	u16 vcc;
+	char chbuf[128];
+	u16 wavelength = 0;
+	struct sff_trasnceiver_codes_byte7 *trasn_code_byte7;
+
+	/* Get transceiver information */
+	rdp_context = kmalloc(sizeof(*rdp_context), GFP_KERNEL);
+
+	rc = lpfc_get_sfp_info_wait(phba, rdp_context);
+	if (rc) {
+		len = scnprintf(buf, PAGE_SIZE - len, "SFP info NA:\n");
+		goto out_free_rdp;
+	}
+
+	strncpy(chbuf, &rdp_context->page_a0[SSF_VENDOR_NAME], 16);
+	chbuf[16] = 0;
+
+	len = scnprintf(buf, PAGE_SIZE - len, "VendorName:\t%s\n", chbuf);
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			 "VendorOUI:\t%02x-%02x-%02x\n",
+			 (uint8_t)rdp_context->page_a0[SSF_VENDOR_OUI],
+			 (uint8_t)rdp_context->page_a0[SSF_VENDOR_OUI + 1],
+			 (uint8_t)rdp_context->page_a0[SSF_VENDOR_OUI + 2]);
+	strncpy(chbuf, &rdp_context->page_a0[SSF_VENDOR_PN], 16);
+	chbuf[16] = 0;
+	len += scnprintf(buf + len, PAGE_SIZE - len, "VendorPN:\t%s\n", chbuf);
+	strncpy(chbuf, &rdp_context->page_a0[SSF_VENDOR_SN], 16);
+	chbuf[16] = 0;
+	len += scnprintf(buf + len, PAGE_SIZE - len, "VendorSN:\t%s\n", chbuf);
+	strncpy(chbuf, &rdp_context->page_a0[SSF_VENDOR_REV], 4);
+	chbuf[4] = 0;
+	len += scnprintf(buf + len, PAGE_SIZE - len, "VendorRev:\t%s\n", chbuf);
+	strncpy(chbuf, &rdp_context->page_a0[SSF_DATE_CODE], 8);
+	chbuf[8] = 0;
+	len += scnprintf(buf + len, PAGE_SIZE - len, "DateCode:\t%s\n", chbuf);
+	len += scnprintf(buf + len, PAGE_SIZE - len, "Identifier:\t%xh\n",
+			 (uint8_t)rdp_context->page_a0[SSF_IDENTIFIER]);
+	len += scnprintf(buf + len, PAGE_SIZE - len, "ExtIdentifier:\t%xh\n",
+			 (uint8_t)rdp_context->page_a0[SSF_EXT_IDENTIFIER]);
+	len += scnprintf(buf + len, PAGE_SIZE - len, "Connector:\t%xh\n",
+			 (uint8_t)rdp_context->page_a0[SSF_CONNECTOR]);
+	wavelength = (rdp_context->page_a0[SSF_WAVELENGTH_B1] << 8) |
+		      rdp_context->page_a0[SSF_WAVELENGTH_B0];
+
+	len += scnprintf(buf + len, PAGE_SIZE - len, "Wavelength:\t%d nm\n",
+			 wavelength);
+	trasn_code_byte7 = (struct sff_trasnceiver_codes_byte7 *)
+			&rdp_context->page_a0[SSF_TRANSCEIVER_CODE_B7];
+
+	len += scnprintf(buf + len, PAGE_SIZE - len, "Speeds: \t");
+		if (*(uint8_t *)trasn_code_byte7 == 0) {
+			len += scnprintf(buf + len, PAGE_SIZE - len,
+					 "Unknown\n");
+		} else {
+			if (trasn_code_byte7->fc_sp_100MB)
+				len += scnprintf(buf + len, PAGE_SIZE - len,
+						 "1 ");
+			if (trasn_code_byte7->fc_sp_200mb)
+				len += scnprintf(buf + len, PAGE_SIZE - len,
+						 "2 ");
+			if (trasn_code_byte7->fc_sp_400MB)
+				len += scnprintf(buf + len, PAGE_SIZE - len,
+						 "4 ");
+			if (trasn_code_byte7->fc_sp_800MB)
+				len += scnprintf(buf + len, PAGE_SIZE - len,
+						 "8 ");
+			if (trasn_code_byte7->fc_sp_1600MB)
+				len += scnprintf(buf + len, PAGE_SIZE - len,
+						 "16 ");
+			if (trasn_code_byte7->fc_sp_3200MB)
+				len += scnprintf(buf + len, PAGE_SIZE - len,
+						 "32 ");
+			if (trasn_code_byte7->speed_chk_ecc)
+				len += scnprintf(buf + len, PAGE_SIZE - len,
+						 "64 ");
+			len += scnprintf(buf + len, PAGE_SIZE - len, "GB\n");
+		}
+	temperature = (rdp_context->page_a2[SFF_TEMPERATURE_B1] << 8 |
+		       rdp_context->page_a2[SFF_TEMPERATURE_B0]);
+	vcc = (rdp_context->page_a2[SFF_VCC_B1] << 8 |
+	       rdp_context->page_a2[SFF_VCC_B0]);
+	tx_power = (rdp_context->page_a2[SFF_TXPOWER_B1] << 8 |
+		    rdp_context->page_a2[SFF_TXPOWER_B0]);
+	tx_bias = (rdp_context->page_a2[SFF_TX_BIAS_CURRENT_B1] << 8 |
+		   rdp_context->page_a2[SFF_TX_BIAS_CURRENT_B0]);
+	rx_power = (rdp_context->page_a2[SFF_RXPOWER_B1] << 8 |
+		    rdp_context->page_a2[SFF_RXPOWER_B0]);
+
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			 "Temperature:\tx%04x C\n", temperature);
+	len += scnprintf(buf + len, PAGE_SIZE - len, "Vcc:\t\tx%04x V\n", vcc);
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			 "TxBiasCurrent:\tx%04x mA\n", tx_bias);
+	len += scnprintf(buf + len, PAGE_SIZE - len, "TxPower:\tx%04x mW\n",
+			 tx_power);
+	len += scnprintf(buf + len, PAGE_SIZE - len, "RxPower:\tx%04x mW\n",
+			 rx_power);
+out_free_rdp:
+	kfree(rdp_context);
+	return len;
+}
+
 /**
  * lpfc_board_mode_show - Return the state of the board
  * @dev: class device that is converted into a Scsi_host.
···
 static DEVICE_ATTR_RO(lpfc_enable_fip);
 static DEVICE_ATTR(board_mode, S_IRUGO | S_IWUSR,
 		   lpfc_board_mode_show, lpfc_board_mode_store);
+static DEVICE_ATTR_RO(lpfc_xcvr_data);
 static DEVICE_ATTR(issue_reset, S_IWUSR, NULL, lpfc_issue_reset);
 static DEVICE_ATTR(max_vpi, S_IRUGO, lpfc_max_vpi_show, NULL);
 static DEVICE_ATTR(used_vpi, S_IRUGO, lpfc_used_vpi_show, NULL);
···
 	&dev_attr_lpfc_fcp_wait_abts_rsp.attr,
 	&dev_attr_nport_evt_cnt.attr,
 	&dev_attr_board_mode.attr,
+	&dev_attr_lpfc_xcvr_data.attr,
 	&dev_attr_max_vpi.attr,
 	&dev_attr_used_vpi.attr,
 	&dev_attr_max_rpi.attr,

drivers/scsi/lpfc/lpfc_crtn.h

···
 
 void lpfc_sli_rpi_release(struct lpfc_vport *vport,
 			  struct lpfc_nodelist *ndlp);
+
+int lpfc_get_sfp_info_wait(struct lpfc_hba *phba,
+			   struct lpfc_rdp_context *rdp_context);

drivers/scsi/lpfc/lpfc_els.c

···
 	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.

drivers/scsi/lpfc/lpfc_hw4.h

···
 #define SFF_LENGTH_COPPER		18
 #define SSF_LENGTH_50UM_OM3		19
 #define SSF_VENDOR_NAME			20
-#define SSF_VENDOR_OUI			36
+#define SSF_TRANSCEIVER2		36
+#define SSF_VENDOR_OUI			37
 #define SSF_VENDOR_PN			40
 #define SSF_VENDOR_REV			56
 #define SSF_WAVELENGTH_B1		60
···
 
 struct sff_trasnceiver_codes_byte7 {
 	uint8_t fc_sp_100MB:1;   /*  100 MB/sec */
-	uint8_t reserve:1;
+	uint8_t speed_chk_ecc:1;
 	uint8_t fc_sp_200mb:1;   /*  200 MB/sec */
 	uint8_t fc_sp_3200MB:1;  /* 3200 MB/sec */
 	uint8_t fc_sp_400MB:1;   /*  400 MB/sec */