On 7/28/15 7:10 AM, Michael Holzheu wrote:
Allow eBPF programs attached to TC qdiscs call skb_vlan_push/pop
via helper functions. These functions may change skb->data/hlen.
This data is cached by s390 JIT to improve performance of ld_abs/ld_ind
instructions. Therefore after a change we have to reload the data.
In case of usage of skb_vlan_push/pop, in the prologue we store
the SKB pointer on the stack and restore it after BPF_JMP_CALL
to skb_vlan_push/pop.
Signed-off-by: Michael Holzheu<holz...@linux.vnet.ibm.com>
Thanks!
Acked-by: Alexei Starovoitov <a...@plumgrid.com>
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