netdev - mlx5e question about PF fwd packets to PF

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Date:   Tue, 31 Dec 2019 16:34:43 +0800
From:   Tonghao Zhang <xiangxia.m.yue@...il.com>
To:     Saeed Mahameed <saeedm@....mellanox.co.il>,
        Roi Dayan <roid@...lanox.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: mlx5e question about PF fwd packets to PF

In one case, we want forward the packets from one PF to otter PF in
eswitchdev mode.

The tc flow can be installed, but it may not work.
tc filter add dev $PF0 protocol all parent ffff: prio 1 handle 1
flower action mirred egress redirect dev $PF1

# tc -d -s filter show dev $PF0 ingress
filter protocol all pref 1 flower chain 0
filter protocol all pref 1 flower chain 0 handle 0x1
  in_hw
action order 1: mirred (Egress Redirect to device enp130s0f1) stolen
  index 1 ref 1 bind 1 installed 19 sec used 0 sec
  Action statistics:
Sent 3206840 bytes 32723 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0

but I can't get packets with:
mlnx_perf -i $PF1

the kernel version is 5.4.0+, the nic is "MT27800 Family [ConnectX-5]".