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White Rabbit Switch - Software
Commit 2fb4ba58 authored by Michal Wasiak's avatar Michal Wasiak Committed by Adam Wujek
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snmp: add helper function to read ports data from rtu's shmem 

Signed-off-by: 's avatarMichal Wasiak <michal.wasiak@gmail.com>
parent 82f4d97f
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userspace/snmpd/snmp_shmem.c
View file @ 2fb4ba58
......@@ -314,6 +314,37 @@ int shmem_rtu_read_htab(struct rtu_filtering_entry *rtu_htab_local, int *read_en
return 0;
}
int shmem_rtu_read_ports(struct rtu_port_entry *ports_tab_local, int *nports)
{
unsigned ii;
unsigned retries = 0;
struct rtu_port_entry *rtu_ports_shm;
struct rtu_shmem_header *rtu_hdr;
rtu_hdr = (void *)rtud_head + rtud_head->data_off;
rtu_ports_shm = wrs_shm_follow(rtud_head, rtu_hdr->rtu_ports);
if (!rtu_ports_shm)
return -2;
/* read data, with the sequential lock to have all data consistent */
while (1) {
ii = wrs_shm_seqbegin(rtud_head);
memcpy(ports_tab_local, rtu_ports_shm,
HAL_MAX_PORTS * sizeof(*rtu_ports_shm));
*nports = rtu_hdr->rtu_nports;
retries++;
if (retries > 100) {
pr_error("couldn't read consistent data from RTU's "
"shmem. Use inconsistent\n");
break; /* use inconsistent data */
}
if (!wrs_shm_seqretry(rtud_head, ii))
break; /* consistent read */
usleep(1000);
}
return 0;
}
/* Compare entries by by MAC */
int cmp_rtu_entries_mac(const void *p1, const void *p2)
{
......
userspace/snmpd/snmp_shmem.h
View file @ 2fb4ba58
......@@ -29,6 +29,8 @@ int shmem_ready_ppsi(void);
int shmem_ready_rtud(void);
int shmem_rtu_read_htab(struct rtu_filtering_entry *rtu_htab_local, int *read_entries);
int shmem_rtu_read_vlans(struct rtu_vlan_table_entry *vlan_tab_local);
int shmem_rtu_read_ports(struct rtu_port_entry *ports_tab_local, int *nports);
/* Compare entries by by MAC */
int cmp_rtu_entries_mac(const void *p1, const void *p2);
/* Compare rtu entries by FID then by MAC */
......
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