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Merge pull request #566 from DrDoof/fix/igmp-off-lookup

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igmp: flood all IP multicast again after igmp off
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bloq authored and GitHub committed 2026-10-14 02:01:55 -05:00
2 parents 24e83d5b74 24c0a95734
commit 69151362a0
2 files changed
+5 -3
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doc/igmp.md
+2 -1
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@@ -73,7 +73,8 @@ uint8_t igmp_packet_handler(void) __banked;
void igmp_show(void) __banked;
```c
`igmp_setup()` is called at boot-time and configures flooding of all IP-MC packets by
default, as otherwise no IP-MC would be possible in the network.
default, as otherwise no IP-MC would be possible in the network. `igmp off` calls it as
well; groups learned while IGMP was on stay in the table, but are no longer looked up.
`igmp_enable()`starts IGMP which cause IGMP packets to be handled by the CPU and forwarding
of IP-MC packets to be limited to only subscribed ports.
rtl837x_igmp.c
+3 -2
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@@ -107,8 +107,7 @@ void igmp_setup(void) __banked
REG_SET(RTL837X_IPV4_UNKN_MC_FLD_PMSK, mask);
REG_SET(RTL837X_IPV6_UNKN_MC_FLD_PMSK, mask);
// Enable lookup of IPv4 MC addresses in table
reg_bit_set(RTL837X_L2_CTRL, L2_CTRL_LUT_IPMC_HASH);
reg_bit_clear(RTL837X_L2_CTRL, L2_CTRL_LUT_IPMC_HASH);
/* Configure per-port IGMP operations when protocol messages are received
* bits 0-9 enable MC protocol snooping
@@ -145,6 +144,8 @@ void igmp_enable(void) __banked
{
print_string("igmp_enable called\n");
igmpEnabled = 1;
// Enable lookup of IPv4 MC addresses in table
reg_bit_set(RTL837X_L2_CTRL, L2_CTRL_LUT_IPMC_HASH);
// Configure trapping of unhandled IGMP protocol packets to CPU
REG_SET(RTL837X_IGMP_TRAP_CFG, IGMP_CPU_PORT | IGMP_TRAP_PRIORITY);