examples/ptpclient: fix delay request message

The size of delay request message sent out by the DPDK
ptpclient application was observed to have extra length
than expected. Due to this, bad messages were observed
on the master side and delay response was not received.
This patch fixes this bug.

Fixes: ab129e9 ("examples/ptpclient: add minimal PTP client")
Cc: stable@dpdk.org

Signed-off-by: Vanshika Shukla <vanshika.shukla@nxp.com>
Acked-by: Nipun Gupta <nipun.gupta@nxp.com>

examples/ptpclient/ptpclient.c

@@ -386,6 +386,7 @@ parse_fup(struct ptpv2_data_slave_ordinary *ptp_data)
 	struct ptp_header *ptp_hdr;
 	struct clock_id *client_clkid;
 	struct ptp_message *ptp_msg;
+	struct delay_req_msg *req_msg;
 	struct rte_mbuf *created_pkt;
 	struct tstamp *origin_tstamp;
 	struct rte_ether_addr eth_multicast = ether_multicast;
@@ -423,7 +424,12 @@ parse_fup(struct ptpv2_data_slave_ordinary *ptp_data)
 
 		created_pkt = rte_pktmbuf_alloc(mbuf_pool);
 		pkt_size = sizeof(struct rte_ether_hdr) +
-			sizeof(struct ptp_message);
+			sizeof(struct delay_req_msg);
+
+		if (rte_pktmbuf_append(created_pkt, pkt_size) == NULL) {
+			rte_pktmbuf_free(created_pkt);
+			return;
+		}
 		created_pkt->data_len = pkt_size;
 		created_pkt->pkt_len = pkt_size;
 		eth_hdr = rte_pktmbuf_mtod(created_pkt, struct rte_ether_hdr *);
@@ -433,22 +439,22 @@ parse_fup(struct ptpv2_data_slave_ordinary *ptp_data)
 		rte_ether_addr_copy(&eth_multicast, &eth_hdr->dst_addr);
 
 		eth_hdr->ether_type = htons(PTP_PROTOCOL);
-		ptp_msg = (struct ptp_message *)
-			(rte_pktmbuf_mtod(created_pkt, char *) +
-			sizeof(struct rte_ether_hdr));
-
-		ptp_msg->delay_req.hdr.seq_id = htons(ptp_data->seqID_SYNC);
-		ptp_msg->delay_req.hdr.msg_type = DELAY_REQ;
-		ptp_msg->delay_req.hdr.ver = 2;
-		ptp_msg->delay_req.hdr.control = 1;
-		ptp_msg->delay_req.hdr.log_message_interval = 127;
-		ptp_msg->delay_req.hdr.message_length =
+		req_msg = rte_pktmbuf_mtod_offset(created_pkt,
+			struct delay_req_msg *, sizeof(struct
+			rte_ether_hdr));
+
+		req_msg->hdr.seq_id = htons(ptp_data->seqID_SYNC);
+		req_msg->hdr.msg_type = DELAY_REQ;
+		req_msg->hdr.ver = 2;
+		req_msg->hdr.control = 1;
+		req_msg->hdr.log_message_interval = 127;
+		req_msg->hdr.message_length =
 			htons(sizeof(struct delay_req_msg));
-		ptp_msg->delay_req.hdr.domain_number = ptp_hdr->domain_number;
+		req_msg->hdr.domain_number = ptp_hdr->domain_number;
 
 		/* Set up clock id. */
 		client_clkid =
-			&ptp_msg->delay_req.hdr.source_port_id.clock_id;
+			&req_msg->hdr.source_port_id.clock_id;
 
 		client_clkid->id[0] = eth_hdr->src_addr.addr_bytes[0];
 		client_clkid->id[1] = eth_hdr->src_addr.addr_bytes[1];