crypto: qat - change PFVF ACK behaviour

Change the PFVF receipt flow on the VF side to read, ack and handle the
message instead of read, handle and ack.
This is done for (1) consistency with the PF side, see the function
adf_recv_and_handle_vf2pf_msg() in adf_pf2vf_msg.c, and (2) performance
reasons, to avoid keeping the CSR busy while parsing the message.

In addition, do not ACK PFVF legacy messages, as this driver is not
capable of handling PFVF legacy messages.
If a PFVF message with MSGORIGIN not set is received, do nothing.
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Marco Chiappero <marco.chiappero@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/adf_pf2vf_msg.c

@@ -195,14 +195,14 @@ bool adf_recv_and_handle_vf2pf_msg(struct adf_accel_dev *accel_dev, u32 vf_nr)
 		return true;
 	}
 
-	/* To ACK, clear the VF2PFINT bit */
-	msg &= ~ADF_VF2PF_INT;
-	ADF_CSR_WR(pmisc_addr, hw_data->get_pf2vf_offset(vf_nr), msg);
-
 	if (!(msg & ADF_VF2PF_MSGORIGIN_SYSTEM))
 		/* Ignore legacy non-system (non-kernel) VF2PF messages */
 		goto err;
 
+	/* To ACK, clear the VF2PFINT bit */
+	msg &= ~ADF_VF2PF_INT;
+	ADF_CSR_WR(pmisc_addr, hw_data->get_pf2vf_offset(vf_nr), msg);
+
 	switch ((msg & ADF_VF2PF_MSGTYPE_MASK) >> ADF_VF2PF_MSGTYPE_SHIFT) {
 	case ADF_VF2PF_MSGTYPE_COMPAT_VER_REQ:
 		{

drivers/crypto/qat/qat_common/adf_vf2pf_msg.c

@@ -69,6 +69,10 @@ bool adf_recv_and_handle_pf2vf_msg(struct adf_accel_dev *accel_dev)
 		/* Ignore legacy non-system (non-kernel) PF2VF messages */
 		goto err;
 
+	/* To ack, clear the PF2VFINT bit */
+	msg &= ~ADF_PF2VF_INT;
+	ADF_CSR_WR(pmisc_bar_addr, offset, msg);
+
 	switch ((msg & ADF_PF2VF_MSGTYPE_MASK) >> ADF_PF2VF_MSGTYPE_SHIFT) {
 	case ADF_PF2VF_MSGTYPE_RESTARTING:
 		dev_dbg(&GET_DEV(accel_dev),
@@ -93,9 +97,6 @@ bool adf_recv_and_handle_pf2vf_msg(struct adf_accel_dev *accel_dev)
 		goto err;
 	}
 
-	/* To ack, clear the PF2VFINT bit */
-	msg &= ~ADF_PF2VF_INT;
-	ADF_CSR_WR(pmisc_bar_addr, offset, msg);
 	return ret;
 
 err: