net: ip: net_pkt: only reserve L2 header for TX case (cfe91b8d) · Commits · Wenxi XU / zephyr

Only reserve L2 header for TX case when allocating net buffer, as for RX case, all the received headers are already in linear buffer when the driver receives the data, and reserve extra L2 header for RX case may exceed the default buffer size. Signed-off-by:

Maochen Wang <maochen.wang@nxp.com>

subsys/net/ip/net_pkt.c

+11 −1

Changes for subsys/net/ip/net_pkt.c: 11 added lines, 1 removed line.
Original line number	Diff line number	Diff line
		@@ -1337,6 +1337,16 @@ int net_pkt_alloc_buffer_with_reserve(struct net_pkt *pkt,
		return 0;
		}

		static bool is_pkt_tx(struct net_pkt *pkt)
		{
		#if defined(CONFIG_NET_CONTEXT_NET_PKT_POOL)
		if ((pkt->context != NULL) && (get_tx_slab(pkt->context) != NULL)) {
		return pkt->slab == get_tx_slab(pkt->context);
		}
		#endif
		return pkt->slab == &tx_pkts;
		}

		#if NET_LOG_LEVEL >= LOG_LEVEL_DBG
		int net_pkt_alloc_buffer_debug(struct net_pkt *pkt,
		size_t size,
		@@ -1364,7 +1374,7 @@ int net_pkt_alloc_buffer(struct net_pkt *pkt,

		iface = net_pkt_iface(pkt);

		if (iface != NULL && net_if_l2(iface)->alloc != NULL) {
		if (iface != NULL && is_pkt_tx(pkt) && net_if_l2(iface)->alloc != NULL) {
		ret = net_if_l2(iface)->alloc(iface, pkt, size, proto, timeout);
		if (ret != -ENOTSUP) {
		return ret;

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