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net: ip: net_pkt: only reserve L2 header for TX case

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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>
This commit is contained in:
Maochen Wang 2024-12-29 04:08:06 +08:00 • committed by Benjamin Cabé
commit cfe91b8df1
1 changed files with 11 additions and 1 deletions
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12
subsys/net/ip/net_pkt.c
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@ -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;