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nfp: bpf: support BPF offload only on little endian

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eBPF is host-endian specific.  Translating both BE and LE eBPF
to the NFP is feasible, but would require quite a bit of indirection.
The fact that I don't have access to any BE hosts that would fit
a 25G/40G/100G NIC is also limiting my ability to test big endian.

For now restrict the offload to little endian hosts only.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-10-12 10:34:13 -07:00 • committed by David S. Miller
parent 3119d1fd46
commit 0f6cf4ddf6
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/netronome/nfp/bpf/main.c
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@ -42,9 +42,11 @@
static bool nfp_net_ebpf_capable(struct nfp_net *nn) static bool nfp_net_ebpf_capable(struct nfp_net *nn)
{ {
#ifdef __LITTLE_ENDIAN
if (nn->cap & NFP_NET_CFG_CTRL_BPF && if (nn->cap & NFP_NET_CFG_CTRL_BPF &&
nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI) nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI)
return true; return true;
#endif
return false; return false;
} }