drivers/ieee802154: Use net_pkt API for reading data on upipe driver

Some legacy left overs.
Just simplifying how to read data into a net_pkt.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

drivers/ieee802154/ieee802154_uart_pipe.c

@@ -117,7 +117,7 @@ static uint8_t *upipe_rx(uint8_t *buf, size_t *off)
 	}
 
 	if (!upipe->rx_len) {
-		if (*buf > 127) {
+		if (*buf > IEEE802154_MAX_PHY_PACKET_SIZE) {
 			goto flush;
 		}
 
@@ -128,27 +128,20 @@ static uint8_t *upipe_rx(uint8_t *buf, size_t *off)
 	upipe->rx_buf[upipe->rx_off++] = *buf;
 
 	if (upipe->rx_len == upipe->rx_off) {
-		struct net_buf *frag;
+		pkt = net_pkt_rx_alloc_with_buffer(upipe->iface, upipe->rx_len,
-
+						   AF_UNSPEC, 0, K_NO_WAIT);
-		pkt = net_pkt_rx_alloc(K_NO_WAIT);
 		if (!pkt) {
 			LOG_DBG("No pkt available");
 			goto flush;
 		}
 
-		frag = net_pkt_get_frag(pkt, upipe->rx_len, K_NO_WAIT);
+		if (net_pkt_write(pkt, upipe->rx_buf, upipe->rx_len)) {
-		if (!frag) {
+			LOG_DBG("No content read?");
-			LOG_DBG("No fragment available");
 			goto out;
 		}
 
-		net_pkt_frag_insert(pkt, frag);
-
-		memcpy(frag->data, upipe->rx_buf, upipe->rx_len);
-		net_buf_add(frag, upipe->rx_len);
-
 #if defined(CONFIG_IEEE802154_UPIPE_HW_FILTER)
-		if (received_dest_addr_matched(frag->data) == false) {
+		if (received_dest_addr_matched(pkt->buffer->data) == false) {
 			LOG_DBG("Packet received is not addressed to me");
 			goto out;
 		}

drivers/ieee802154/ieee802154_uart_pipe.h

@@ -20,7 +20,7 @@ struct upipe_context {
 	bool rx;
 	uint8_t rx_len;
 	uint8_t rx_off;
-	uint8_t rx_buf[127];
+	uint8_t rx_buf[IEEE802154_MAX_PHY_PACKET_SIZE];
 };
 
 #endif /* ZEPHYR_DRIVERS_IEEE802154_IEEE802154_UART_PIPE_H_ */