net: ethtool: Add back transceiver type

Commit 3f1ac7a700d0 ("net: ethtool: add new ETHTOOL_xLINKSETTINGS API")
deprecated the ethtool_cmd::transceiver field, which was fine in
premise, except that the PHY library was actually using it to report the
type of transceiver: internal or external.

Use the first word of the reserved field to put this __u8 transceiver
field back in. It is made read-only, and we don't expect the
ETHTOOL_xLINKSETTINGS API to be doing anything with this anyway, so this
is mostly for the legacy path where we do:

ethtool_get_settings()
-> dev->ethtool_ops->get_link_ksettings()
   -> convert_link_ksettings_to_legacy_settings()

to have no information loss compared to the legacy get_settings API.

Fixes: 3f1ac7a700d0 ("net: ethtool: add new ETHTOOL_xLINKSETTINGS API")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 9c041da..5bd1b1d 100644 (file)
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -1753,6 +1753,8 @@ enum ethtool_reset_flags {
  *     %ethtool_link_mode_bit_indices for the link modes, and other
  *     link features that the link partner advertised through
  *     autonegotiation; 0 if unknown or not applicable.  Read-only.
+ * @transceiver: Used to distinguish different possible PHY types,
+ *     reported consistently by PHYLIB.  Read-only.
  *
  * If autonegotiation is disabled, the speed and @duplex represent the
  * fixed link mode and are writable if the driver supports multiple
@@ -1804,7 +1806,9 @@ struct ethtool_link_settings {
        __u8    eth_tp_mdix;
        __u8    eth_tp_mdix_ctrl;
        __s8    link_mode_masks_nwords;
-       __u32   reserved[8];
+       __u8    transceiver;
+       __u8    reserved1[3];
+       __u32   reserved[7];
        __u32   link_mode_masks[0];
        /* layout of link_mode_masks fields:
         * __u32 map_supported[link_mode_masks_nwords];

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 6a582ae..3228411 100644 (file)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -525,6 +525,8 @@ convert_link_ksettings_to_legacy_settings(
                = link_ksettings->base.eth_tp_mdix;
        legacy_settings->eth_tp_mdix_ctrl
                = link_ksettings->base.eth_tp_mdix_ctrl;
+       legacy_settings->transceiver
+               = link_ksettings->base.transceiver;
        return retval;
 }