On 04/11/2021 01:07, Jakub Kicinski wrote:
On Thu, 4 Nov 2021 00:20:30 +0200 Grygorii Strashko wrote:
On 03/11/2021 02:38, Jakub Kicinski wrote:
On Mon, 1 Nov 2021 19:01:21 +0200 Grygorii Strashko wrote:
- 01:00:00:00:00:00 fixed value has to be used for MC packets rate
limiting (exact match)
This looks like a stretch, why not use a mask? You can require users to
always install both BC and MC rules if you want to make sure the masked
rule does not match BC.
Those matching rules are hard coded in HW for packet rate limiting and SW only
enables them and sets requested pps limit.
- 1:BC: HW does exact match on BC MAC address
- 2:MC: HW does match on MC bit (the least-significant bit of the first octet)
Therefore the exact match done in this patch for above dst_mac's with
is_broadcast_ether_addr() and ether_addr_equal().
Right but flower supports masked matches for dest address, as far as I
can tell. So you should check the mask is what you expect as well, not
just look at the key. Mask should be equal to key in your case IIUC, so:
if (is_broadcast_ether_addr(match.key->dst) &&
is_broadcast_ether_addr(match.mask->dst))
and
if (!memcmp(match.key->dst, mc_mac, ETH_ALEN) &&
!memcmp(match.mask->dst, mc_mac, ETH_ALEN))
I think you should also test that the mask, not the key of source addr
is zero.
Note that ether_addr_equal() assumes the mac address is alinged to 2,
which I'm not sure is the case here.
Also you can make mc_mac a static const.
Ah, got it. Thank you.
The K3 cpsw also supports number configurable policiers (bit rate limit) in
ALE for which supports is to be added, and for them MC mask (sort of, it uses
number of ignored bits, like FF-FF-FF-00-00-00) can be used.
--
Best regards,
grygorii
