[PATCH net v3 0/2] igc: fix RX timestamp handling and AF_XDP buffer sizing

[Paul Moses <p@1g4.org>]

v2..v3
Restore the original timestamp fix and description instead of tracking
frame boundaries. Patch 2 carries Maciej's AF_XDP buffer-size fix unchanged.

v1..v2
Changed commit message in attempt to satisfy bots. No code changes.

Maciej's patch:
https://lore.kernel.org/all/at+t%2FjHczGvyXKRN@boxer/

#
# REPRO
# 
# Receiver: igc / enp1s0 / 10.0.5.175
# Sender:   RTL8125B / enP4p65s0 / 10.0.5.165

# Both hosts
sudo ip link set dev enp1s0 mtu 9000
sudo ip link set dev enP4p65s0 mtu 9000

# Baseline: RX timestamping off
sudo hwstamp_ctl -i enp1s0 -t 0 -r 0
ping -n -M do -c 5 -s 8972 10.0.5.175
# 5/5 received

# Enable RX timestamping only
sudo hwstamp_ctl -i enp1s0 -t 0 -r 1

# Receiver
sudo timeout 20 tcpdump -ni enp1s0 -s 0 -w /tmp/igc-jumbo.pcap \
  'icmp and host 10.0.5.165'

# Sender
ping -n -M do -c 5 -W 2 -s 8972 10.0.5.175
# 0/5 received

# Receiver
sudo tcpdump -nn -e -vvv -r /tmp/igc-jumbo.pcap
# length 8950
# [total length 9000 > length 8936] (invalid)
# wrong icmp cksum

# Expected Ethernet length: 9014
# Captured length:          8950
# Loss:                       64 = 4 continuation buffers * 16 bytes

# Disable RX timestamping again
sudo hwstamp_ctl -i enp1s0 -t 0 -r 0
ping -n -M do -c 5 -s 8972 10.0.5.175
# 5/5 received

-- 
2.56.GIT