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RIOT/sys/include/net/gnrc/netif/6lo.h
Benjamin Valentin 4065da8838 gnrc/netif: 6lo: use 16 bit for max_frag_size
Using 8 bit for `max_frag_size` limits that value to 255.
802.15.4g specifies a PDU of 2047 bytes which exceeds that limit.

Using a 16 bit value here allows to use the full L2 PDU.

Before:

    12:02:16,300 # ping6 fe80::2068:3123:59f5:d238%8 -s 400
    12:02:16,302 # sending 244 bytes
    12:02:16,387 # sending 218 bytes
    12:02:16,624 # 408 bytes from fe80::2068:3123:59f5:d238%8: icmp_seq=0 ttl=64 rssi=-49 dBm time=316.307 ms
    12:02:17,302 # sending 244 bytes
    12:02:17,387 # sending 218 bytes
    12:02:17,624 # 408 bytes from fe80::2068:3123:59f5:d238%8: icmp_seq=1 ttl=64 rssi=-49 dBm time=316.307 ms
    12:02:18,302 # sending 244 bytes
    12:02:18,387 # sending 218 bytes
    12:02:18,624 # 408 bytes from fe80::2068:3123:59f5:d238%8: icmp_seq=2 ttl=64 rssi=-50 dBm time=316.306 ms
    12:02:18,625 #
    12:02:18,629 # --- fe80::2068:3123:59f5:d238 PING statistics ---

With this patch:

    12:09:44,276 #  ping6 fe80::2068:3123:59f5:d238%8 -s 400
    12:09:44,278 # sending 432 bytes
    12:09:44,574 # 408 bytes from fe80::2068:3123:59f5:d238%8: icmp_seq=0 ttl=64 rssi=-52 dBm time=289.888 ms
    12:09:45,279 # sending 432 bytes
    12:09:45,574 # 408 bytes from fe80::2068:3123:59f5:d238%8: icmp_seq=1 ttl=64 rssi=-52 dBm time=289.885 ms
    12:09:46,069 # sending 43 bytes
    12:09:46,279 # sending 432 bytes
    12:09:46,499 # sending 43 bytes
    12:09:46,574 # 408 bytes from fe80::2068:3123:59f5:d238%8: icmp_seq=2 ttl=64 rssi=-47 dBm time=289.886 ms
    12:09:46,574 #
    12:09:46,578 # --- fe80::2068:3123:59f5:d238 PING statistics ---
2020-04-29 12:49:36 +02:00

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C

/*
* Copyright (C) 2017 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup net_gnrc_netif
* @{
*
* @file
* @brief 6LoWPAN definitions for @ref net_gnrc_netif
*
* @author Martine Lenders <m.lenders@fu-berlin.de>
*/
#ifndef NET_GNRC_NETIF_6LO_H
#define NET_GNRC_NETIF_6LO_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief 6Lo component of @ref gnrc_netif_t
*/
typedef struct {
/**
* @brief Maximum fragment size for 6Lo fragmentation.
*
* @note Only available with module
* @ref net_gnrc_sixlowpan_frag "gnrc_sixlowpan_frag".
*/
uint16_t max_frag_size;
} gnrc_netif_6lo_t;
#ifdef __cplusplus
}
#endif
#endif /* NET_GNRC_NETIF_6LO_H */
/** @} */