ice: add support for sideband messages

In order to support certain device features, including enabling the PTP
hardware clock, the ice driver needs to control some registers on the
device PHY.

These registers are accessed by sending sideband messages. For some
hardware, these messages must be sent over the device admin queue, while
other hardware has a dedicated control queue for the sideband messages.

Add the neighbor device message structure for sending a message to the
neighboring device. Where supported, initialize the sideband control
queue and handle cleanup.

Add a wrapper function for sending sideband control queue messages that
read or write a neighboring device register.

Because some devices send sideband messages over the AdminQ, also
increase the length of the admin queue to allow more messages to be
queued up. This is important because the sideband messages add
additional pressure on the AQ usage.

This support will be used in following patches to enable support for
CONFIG_1588_PTP_CLOCK.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_controlq.h b/drivers/net/ethernet/intel/ice/ice_controlq.h
index fe75871e48ca..c07e9cc9fc6e 100644
--- a/drivers/net/ethernet/intel/ice/ice_controlq.h
+++ b/drivers/net/ethernet/intel/ice/ice_controlq.h
@@ -9,6 +9,7 @@
 /* Maximum buffer lengths for all control queue types */
 #define ICE_AQ_MAX_BUF_LEN 4096
 #define ICE_MBXQ_MAX_BUF_LEN 4096
+#define ICE_SBQ_MAX_BUF_LEN 512
 
 #define ICE_CTL_Q_DESC(R, i) \
 	(&(((struct ice_aq_desc *)((R).desc_buf.va))[i]))
@@ -29,6 +30,7 @@ enum ice_ctl_q {
 	ICE_CTL_Q_UNKNOWN = 0,
 	ICE_CTL_Q_ADMIN,
 	ICE_CTL_Q_MAILBOX,
+	ICE_CTL_Q_SB,
 };
 
 /* Control Queue timeout settings - max delay 1s */