netdev - [PATCH bpf-next 10/12] selftests/bpf: avoid heap allocation

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Date:   Fri, 22 Jan 2021 16:47:23 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, jonathan.lemon@...il.com,
        ciara.loftus@...el.com, weqaar.a.janjua@...el.com
Subject: [PATCH bpf-next 10/12] selftests/bpf: avoid heap allocation

From: Björn Töpel <bjorn.topel@...el.com>

The data variable is only used locally. Instead of using the heap,
stick to using the stack.

Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
---
 tools/testing/selftests/bpf/xdpxceiver.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
index 34bdcae9b908..2da59b142c03 100644
--- a/tools/testing/selftests/bpf/xdpxceiver.c
+++ b/tools/testing/selftests/bpf/xdpxceiver.c
@@ -807,10 +807,10 @@ static void *worker_testapp_validate(void *arg)
 {
 	struct udphdr *udp_hdr =
 	    (struct udphdr *)(pkt_data + sizeof(struct ethhdr) + sizeof(struct iphdr));
-	struct generic_data *data = (struct generic_data *)malloc(sizeof(struct generic_data));
 	struct iphdr *ip_hdr = (struct iphdr *)(pkt_data + sizeof(struct ethhdr));
 	struct ethhdr *eth_hdr = (struct ethhdr *)pkt_data;
 	struct ifobject *ifobject = (struct ifobject *)arg;
+	struct generic_data data;
 	void *bufs = NULL;
 
 	pthread_attr_setstacksize(&attr, THREAD_STACK);
@@ -840,17 +840,16 @@ static void *worker_testapp_validate(void *arg)
 		for (int i = 0; i < num_frames; i++) {
 			/*send EOT frame */
 			if (i == (num_frames - 1))
-				data->seqnum = -1;
+				data.seqnum = -1;
 			else
-				data->seqnum = i;
-			gen_udp_hdr(data, ifobject, udp_hdr);
+				data.seqnum = i;
+			gen_udp_hdr(&data, ifobject, udp_hdr);
 			gen_ip_hdr(ifobject, ip_hdr);
 			gen_udp_csum(udp_hdr, ip_hdr);
 			gen_eth_hdr(ifobject, eth_hdr);
 			gen_eth_frame(ifobject->umem, i * XSK_UMEM__DEFAULT_FRAME_SIZE);
 		}
 
-		free(data);
 		ksft_print_msg("Sending %d packets on interface %s\n",
 			       (opt_pkt_count - 1), ifobject->ifname);
 		tx_only_all(ifobject);
-- 
2.27.0