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gnrc_gomach: add sender ID number limit in beacon packet.

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This commit is contained in:
zhuoshuguo 2017-12-11 11:31:39 +01:00
parent 0454491e58
commit cebc995ec3
2 changed files with 19 additions and 0 deletions
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13
sys/include/net/gnrc/gomach/gomach.h
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@ -276,6 +276,19 @@ extern "C" {
#define GNRC_GOMACH_MAX_ALLOC_SLOTS_NUM (25U) #define GNRC_GOMACH_MAX_ALLOC_SLOTS_NUM (25U)
#endif #endif
/**
* @brief Maximum number of senders allowed to be allocated slots in one cycle.
*
* Exclude the static GoMacH MAC header payload in the beacon, which is 20 bytes,
* we have 107 bytes left for constructing the sender-ID list and the related slots-number
* list. A combined slots allocation information pair (sender ID with its corresponded
* allocate slots number) will cost 9 (8+1) bytes, thus we can hold a maximum of 11
* i.e., ((127 - 20) / 9), sender IDs in the beacon.
*/
#ifndef GNRC_GOMACH_MAX_ALLOC_SENDER_NUM
#define GNRC_GOMACH_MAX_ALLOC_SENDER_NUM (11U)
#endif
/** /**
* @brief Maximum t2k attempts before going to t2u in GoMacH. * @brief Maximum t2k attempts before going to t2u in GoMacH.
* *

6
sys/net/gnrc/link_layer/gomach/gomach_internal.c
View File

@ -488,7 +488,13 @@ int gnrc_gomach_send_beacon(gnrc_netif_t *netif)
total_tdma_slot_num -= redueced_slots_num; total_tdma_slot_num -= redueced_slots_num;
break; break;
} }
j++; j++;
/* If reach the maximum sender ID number limit, stop. */
if (total_tdma_node_num >= GNRC_GOMACH_MAX_ALLOC_SENDER_NUM) {
break;
}
} }
} }