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storm: meters from 24 up, plainer parser, documentation from the review

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Storm control used meters 0 to 39, the same meters the ACL hands out,
so a storm limit and an acl meter could overwrite each other. It now
uses 24 + port * 4 + type, meters 24 to 63.

parse_storm() is no longer reentrant and uses plain locals, looks the
type up in a while loop and returns straight from the one-line cases.
storm_show() uses plain locals too.

The documentation says how IGMP decides between mcast and umcast, how
to get from a meter index to its limit, where the IFG bit of a meter
is, and what an ingress bandwidth limit on the same port does to the
storm limit.
This commit is contained in:
DrDoof committed 2026-09-30 22:48:31 +02:00
1 parent 26547f3e01
commit de431c6d84
5 files changed
+44 -32
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rtl837x_storm.c
+9 -8
View File
@@ -11,12 +11,13 @@
extern __code struct machine machine;
extern __xdata uint8_t sfr_data[4];
/* Meter index fields of RTL837X_STORM_MIDX, [type << 1 | ports 5-9] */
/* RTL837X_STORM_MIDX words, row type * 2 + half: half 0 holds ports 0-4, half 1 ports 5-9,
* 6 bits per port, each set to STORM_METER(port, type) */
static const __code uint8_t storm_midx[8][4] = {
{ 0x10, 0x30, 0x81, 0x00 }, { 0x24, 0x81, 0xc6, 0x14 },
{ 0x11, 0x34, 0x91, 0x41 }, { 0x25, 0x85, 0xd6, 0x55 },
{ 0x12, 0x38, 0xa1, 0x82 }, { 0x26, 0x89, 0xe6, 0x96 },
{ 0x13, 0x3c, 0xb1, 0xc3 }, { 0x27, 0x8d, 0xf6, 0xd7 },
{ 0x28, 0x92, 0x07, 0x18 }, { 0x3c, 0xe3, 0x4c, 0x2c },
{ 0x29, 0x96, 0x17, 0x59 }, { 0x3d, 0xe7, 0x5c, 0x6d },
{ 0x2a, 0x9a, 0x27, 0x9a }, { 0x3e, 0xeb, 0x6c, 0xae },
{ 0x2b, 0x9e, 0x37, 0xdb }, { 0x3f, 0xef, 0x7c, 0xef },
};
static __code char * __code storm_names[STORM_TYPES] = { " bcast ", " mcast ", " ucast ", " umcast " };
@@ -24,7 +25,7 @@ static __code char * __code storm_names[STORM_TYPES] = { " bcast ", " mcast ", "
void storm_set(uint8_t port, __xdata uint8_t type, __xdata uint32_t rate, __xdata uint8_t pps) __banked
{
__xdata uint8_t idx = (port << 2) | type;
__xdata uint8_t idx = STORM_METER(port, type);
__xdata uint8_t row = (type << 1) | (port >= 5 ? 1 : 0);
__xdata uint8_t * __xdata r = (uint8_t *)&rate;
@@ -64,7 +65,7 @@ void storm_off(uint8_t port, __xdata uint8_t type) __banked
void storm_show(void) __banked
{
__xdata uint8_t i, t, idx;
uint8_t i, t, idx;
for (i = machine.min_port; i <= machine.max_port; i++) {
print_string("port ");
@@ -75,7 +76,7 @@ void storm_show(void) __banked
print_string("off");
continue;
}
idx = (i << 2) | t;
idx = STORM_METER(i, t);
reg_read_m(RTL837X_METER_RATE + (idx << 2));
print_byte(sfr_data[1]); print_byte(sfr_data[2]); print_byte(sfr_data[3]);
if (reg_bit_test(RTL837X_METER_MODE + ((idx >> 5) << 2), idx & 0x1f))