diff options
| author | Nicolai Buchwitz <nb@tipi-net.de> | 2026-10-06 07:41:33 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-10-08 11:48:50 -0700 |
| commit | 9151d6c42799105e109c8b54dbaad91ce0e17c47 (patch) | |
| tree | 3e1ee798184e51c7cc2dfa3632a3504b70d3a969 /scripts/gdb/linux | |
| parent | 6b48ed85ae0ca37c7403ef5d512be75975844f2f (diff) | |
net: macb: copy shared skbs before appending the FCS
macb_pad_and_fcs() appends the FCS in place when the skb has tailroom.
A shared skb, as pktgen sends in clone_skb mode, grows by one FCS per
transmit. BQL then completes more bytes than were queued and
dql_completed() hits its BUG_ON.
On a Raspberry Pi CM5 (RP1 GEM) pktgen with clone_skb 1000 burst 32 at
60 bytes kills the box within seconds.
Copy shared skbs before appending the FCS. Clearing IFF_TX_SKB_SHARING
would also fix it but makes pktgen refuse clone_skb on macb.
Fixes: 653e92a9175e ("net: macb: add support for padding and fcs computation")
Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>
Link: https://patch.msgid.link/20261006-nb-macb-shared-skb-net-v1-2-a80641479041@tipi-net.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'scripts/gdb/linux')
0 files changed, 0 insertions, 0 deletions