_CPU_TO_LE16(IXGBE_ACI_FLAG_BUF)) {
+			if ((buf && buf_size == 0) ||
+			    (buf == NULL && buf_size)) {
+				status = IXGBE_ERR_PARAM;
+				break;
+			}
+			if (buf && buf_size)
+				valid_buf = true;
+		}
+
+		if (valid_buf == true) {
+			if (buf_size % 4 == 0)
+				tmp_buf_size = buf_size;
+			else
+				tmp_buf_size = (buf_size & (u16)(~0x03)) + 4;
+
+			tmp_buf = (u32*)ixgbe_malloc(hw, tmp_buf_size);
+			if (!tmp_buf)
+				return IXGBE_ERR_OUT_OF_MEM;
+
+			/* tmp_buf will be firstly filled with 0xFF and after
+			 * that the content of buf will be written into it.
+			 * This approach lets us use valid buf_size and
+			 * prevents us from reading past buf area
+			 * when buf_size mod 4 not equal to 0.
+			 */
+			memset(tmp_buf, 0xFF, tmp_buf_size);
+			memcpy(tmp_buf, buf, buf_size);
+
+			if (tmp_buf_size > IXGBE_ACI_LG_BUF)
+				desc->flags |=
+				IXGBE_CPU_TO_LE16(IXGBE_ACI_FLAG_LB);
+
+			desc->datalen = IXGBE_CPU_TO_LE16(buf_size);
+
+			if (desc->flags & IXGBE_CPU_TO_LE16(IXGBE_ACI_FLAG_RD)) {
+				for (i = 0; i < tmp_buf_size / 4; i++) {
+					IXGBE_WRITE_REG(hw, PF_HIBA(i),
+						IXGBE_LE32_TO_CPU(tmp_buf[i]));
+				}
+			}
+		}
+
+		/* Descriptor is written to specific registers */
+		for (i = 0; i < IXGBE_ACI_DESC_SIZE_IN_DWORDS; i++)
+			IXGBE_WRITE_REG(hw, PF_HIDA(i),
+					IXGBE_LE32_TO_CPU(raw_desc[i]));
+
+		/* SW has to set PF_HICR.C bit and clear PF_HICR.SV and
+		 * PF_HICR_EV
+		 */
+		hicr = IXGBE_READ_REG(hw, PF_HICR);
+		hicr = (hicr | PF_HICR_C) & ~(PF_HICR_SV | PF_HICR_EV);
+		IXGBE_WRITE_REG(hw, PF_HICR, hicr);
+
+		/* Wait for sync Admin Command response */
+		for (i = 0; i < IXGBE_ACI_SYNC_RESPONSE_TIMEOUT; i += 1) {
+			hicr = IXGBE_READ_REG(hw, PF_HICR);
+			if ((hicr & PF_HICR_SV) || !(hicr & PF_HICR_C))
+				break;
+
+			msec_delay(1);
+		}
+
+		/* Wait for async Admin Command response */
+		if ((hicr & PF_HICR_SV) && (hicr & PF_HICR_C)) {
+			for (i = 0; i < IXGBE_ACI_ASYNC_RESPONSE_TIMEOUT;
+			     i += 1) {
+				hicr = IXGBE_READ_REG(hw, PF_HICR);
+				if ((hicr & PF_HICR_EV) || !(hicr & PF_HICR_C))
+					break;
+
+				msec_delay(1);
+			}
+		}
+
+		/* Read sync Admin Command response */
+		if ((hicr & PF_HICR_SV)) {
+			for (i = 0; i < IXGBE_ACI_DESC_SIZE_IN_DWORDS; i++) {
+				raw_desc[i] = IXGBE_READ_REG(hw, PF_HIDA(i));
+				raw_desc[i] = IXGBE_CPU_TO_LE32(raw_desc[i]);
+			}
+		}
+
+		/* Read async Admin Command response */
+		if ((hicr & PF_HICR_EV) && !(hicr & PF_HICR_C)) {
+			for (i = 0; i < IXGBE_ACI_DESC_SIZE_IN_DWORDS; i++) {
+				raw_desc[i] = IXGBE_READ_REG(hw, PF_HIDA_2(i));
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