bnxt_en: Provide stored devlink "fw" version on older firmware

On older firmware that doesn't support the HWRM_NVM_GET_DEV_INFO
command that returns detailed stored firmware versions, fallback
to use the same firmware package version that is reported to ethtool.
Refactor bnxt_get_pkgver() in bnxt_ethtool.c so that devlink can call
and get the package version.

Signed-off-by: Vikas Gupta <[e-mail]>
Reviewed-by: Edwin Peer <[e-mail]>
Signed-off-by: Michael Chan <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

···
 
 	rc = bnxt_hwrm_nvm_get_dev_info(bp, &nvm_dev_info);
 	if (rc ||
-	    !(nvm_dev_info.flags & NVM_GET_DEV_INFO_RESP_FLAGS_FW_VER_VALID))
+	    !(nvm_dev_info.flags & NVM_GET_DEV_INFO_RESP_FLAGS_FW_VER_VALID)) {
+		if (!bnxt_get_pkginfo(bp->dev, buf, sizeof(buf)))
+			return bnxt_dl_info_put(bp, req, BNXT_VERSION_STORED,
+						DEVLINK_INFO_VERSION_GENERIC_FW,
+						buf);
 		return 0;
+	}
 
 	buf[0] = 0;
 	strncat(buf, nvm_dev_info.pkg_name, HWRM_FW_VER_STR_LEN);

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

···
 	return retval;
 }
 
-static void bnxt_get_pkgver(struct net_device *dev)
+int bnxt_get_pkginfo(struct net_device *dev, char *ver, int size)
 {
 	struct bnxt *bp = netdev_priv(dev);
 	u16 index = 0;
 	char *pkgver;
 	u32 pkglen;
 	u8 *pkgbuf;
-	int len;
+	int rc;
 
-	if (bnxt_find_nvram_item(dev, BNX_DIR_TYPE_PKG_LOG,
-				 BNX_DIR_ORDINAL_FIRST, BNX_DIR_EXT_NONE,
-				 &index, NULL, &pkglen) != 0)
-		return;
+	rc = bnxt_find_nvram_item(dev, BNX_DIR_TYPE_PKG_LOG,
+				  BNX_DIR_ORDINAL_FIRST, BNX_DIR_EXT_NONE,
+				  &index, NULL, &pkglen);
+	if (rc)
+		return rc;
 
 	pkgbuf = kzalloc(pkglen, GFP_KERNEL);
 	if (!pkgbuf) {
 		dev_err(&bp->pdev->dev, "Unable to allocate memory for pkg version, length = %u\n",
 			pkglen);
-		return;
+		return -ENOMEM;
 	}
 
-	if (bnxt_get_nvram_item(dev, index, 0, pkglen, pkgbuf))
+	rc = bnxt_get_nvram_item(dev, index, 0, pkglen, pkgbuf);
+	if (rc)
 		goto err;
 
 	pkgver = bnxt_parse_pkglog(BNX_PKG_LOG_FIELD_IDX_PKG_VERSION, pkgbuf,
 				   pkglen);
-	if (pkgver && *pkgver != 0 && isdigit(*pkgver)) {
-		len = strlen(bp->fw_ver_str);
-		snprintf(bp->fw_ver_str + len, FW_VER_STR_LEN - len - 1,
-			 "/pkg %s", pkgver);
-	}
+	if (pkgver && *pkgver != 0 && isdigit(*pkgver))
+		strscpy(ver, pkgver, size);
+	else
+		rc = -ENOENT;
+
 err:
 	kfree(pkgbuf);
+
+	return rc;
+}
+
+static void bnxt_get_pkgver(struct net_device *dev)
+{
+	struct bnxt *bp = netdev_priv(dev);
+	char buf[FW_VER_STR_LEN];
+	int len;
+
+	if (!bnxt_get_pkginfo(dev, buf, sizeof(buf))) {
+		len = strlen(bp->fw_ver_str);
+		snprintf(bp->fw_ver_str + len, FW_VER_STR_LEN - len - 1,
+			 "/pkg %s", buf);
+	}
 }
 
 static int bnxt_get_eeprom(struct net_device *dev,

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.h

···
 			     u8 self_reset, u8 flags);
 int bnxt_flash_package_from_fw_obj(struct net_device *dev, const struct firmware *fw,
 				   u32 install_type);
+int bnxt_get_pkginfo(struct net_device *dev, char *ver, int size);
 void bnxt_ethtool_init(struct bnxt *bp);
 void bnxt_ethtool_free(struct bnxt *bp);