nfp: bpf: relax prog rejection through max_pkt_offset

NFP is refusing to offload programs whenever the MTU is set to a value
larger than the max packet bytes that fits in NFP Cluster Target Memory
(CTM). However, a eBPF program doesn't always need to access the whole
packet data.

Verifier has always calculated maximum direct packet access (DPA) offset,
and kept it in max_pkt_offset inside prog auxiliar information. This patch
relax prog rejection based on max_pkt_offset.

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/offload.c b/drivers/net/ethernet/netronome/nfp/bpf/offload.c
index ba8ceed..07bdc1f 100644 (file)
--- a/drivers/net/ethernet/netronome/nfp/bpf/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/offload.c
@@ -489,14 +489,15 @@ nfp_net_bpf_load(struct nfp_net *nn, struct bpf_prog *prog,
                 struct netlink_ext_ack *extack)
 {
        struct nfp_prog *nfp_prog = prog->aux->offload->dev_priv;
-       unsigned int max_mtu, max_stack, max_prog_len;
+       unsigned int fw_mtu, pkt_off, max_stack, max_prog_len;
        dma_addr_t dma_addr;
        void *img;
        int err;
 
-       max_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32;
-       if (max_mtu < nn->dp.netdev->mtu) {
-               NL_SET_ERR_MSG_MOD(extack, "BPF offload not supported with MTU larger than HW packet split boundary");
+       fw_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32;
+       pkt_off = min(prog->aux->max_pkt_offset, nn->dp.netdev->mtu);
+       if (fw_mtu < pkt_off) {
+               NL_SET_ERR_MSG_MOD(extack, "BPF offload not supported with potential packet access beyond HW packet split boundary");
                return -EOPNOTSUPP;
        }