The 09/25/2020 02:39, Vladimir Oltean wrote:

Hi Vladimir,

Hi Horatiu,

On Thu, Apr 23, 2020 at 10:29:48AM +0200, Horatiu Vultur wrote:

quoted

quoted

quoted

+static const struct vcap_props vcap_is2 = {
+       .name = "IS2",
+       .tg_width = 2,
+       .sw_count = 4,
+       .entry_count = VCAP_IS2_CNT,
+       .entry_words = BITS_TO_32BIT(VCAP_IS2_ENTRY_WIDTH),
+       .entry_width = VCAP_IS2_ENTRY_WIDTH,
+       .action_count = (VCAP_IS2_CNT + VCAP_PORT_CNT + 2),
+       .action_words = BITS_TO_32BIT(VCAP_IS2_ACTION_WIDTH),
+       .action_width = (VCAP_IS2_ACTION_WIDTH),
+       .action_type_width = 1,
+       .action_table = {
+               {
+                       .width = (IS2_AO_ACL_ID + IS2_AL_ACL_ID),
+                       .count = 2
+               },
+               {
+                       .width = 6,
+                       .count = 4
+               },
+       },
+       .counter_words = BITS_TO_32BIT(4 * ENTRY_WIDTH),
+       .counter_width = ENTRY_WIDTH,
+};

Coming again to this patch, I'm having a very hard time understanding
how VCAP_IS2_ENTRY_WIDTH is derived and what it represents, especially
since the VCAP_CONST_ENTRY_WIDTH register reads something different.
Could you please explain?

To be honest, I don't remember precisely. I will need to setup a board
and see exactly. But from what I remember:
- according to this[1] in chapter 3.8.6, table 71. It says that the full
  entry of IS2 is 384. And this 384 represent a full entry. In this row,
  can be also sub entries like: half entry and quater entries. And each
  entry has 2 bits that describes the entry type. So if you have 2 bits
  for each possible entry then you have 8 bits describing each type. One
  observation is even if you have a full entry each pair of 2 bits
  describing the type needs to be set that is a full entry. Maybe if you
  have a look at Figure 30, it would be a little bit more clear. Even
  there is a register called VCAP_TG_DAT that information is storred
  internally in the VCAP_ENTRY_DAT.
- so having those in mind, then VCAP_IS2_ENTRY_WIDTH is the full entry
  length - 8 bits. 384 - 8 = 376.
- then if I remember correctly then VCAP_CONST_ENTRY_WIDTH should be
  384? or 12 if it is counting the words.

Does it make sense or am I completly off?

Thanks,
-Vladimir

[1] http://ww1.microchip.com/downloads/en/DeviceDoc/VMDS-10491.pdf

-- 
/Horatiu