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bpf, nfp: add meta data support 

Implement support for transferring XDP meta data into skb for
nfp driver; before calling into the program, xdp.data_meta points
to xdp.data, where on program return with pass verdict, we call
into skb_metadata_set().

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-09-25 02:25:54 +02:00 committed by David S. Miller
parent 22c8852624
commit 65d88fd0ba
1 changed files with 15 additions and 25 deletions
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40
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
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@ -1574,27 +1574,6 @@ nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
return true;
}
static int nfp_net_run_xdp(struct bpf_prog *prog, void *data, void *hard_start,
unsigned int *off, unsigned int *len)
{
struct xdp_buff xdp;
void *orig_data;
int ret;
xdp.data_hard_start = hard_start;
xdp.data = data + *off;
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = data + *off + *len;
orig_data = xdp.data;
ret = bpf_prog_run_xdp(prog, &xdp);
*len -= xdp.data - orig_data;
*off += xdp.data - orig_data;
return ret;
}
/**
* nfp_net_rx() - receive up to @budget packets on @rx_ring
* @rx_ring: RX ring to receive from
@ -1630,6 +1609,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
struct nfp_meta_parsed meta;
struct net_device *netdev;
dma_addr_t new_dma_addr;
u32 meta_len_xdp = 0;
void *new_frag;
idx = D_IDX(rx_ring, rx_ring->rd_p);
@ -1708,16 +1688,24 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
if (xdp_prog && !(rxd->rxd.flags & PCIE_DESC_RX_BPF &&
dp->bpf_offload_xdp) && !meta.portid) {
void *orig_data = rxbuf->frag + pkt_off;
unsigned int dma_off;
void *hard_start;
struct xdp_buff xdp;
int act;
hard_start = rxbuf->frag + NFP_NET_RX_BUF_HEADROOM;
xdp.data_hard_start = rxbuf->frag + NFP_NET_RX_BUF_HEADROOM;
xdp.data = orig_data;
xdp.data_meta = orig_data;
xdp.data_end = orig_data + pkt_len;
act = bpf_prog_run_xdp(xdp_prog, &xdp);
pkt_len -= xdp.data - orig_data;
pkt_off += xdp.data - orig_data;
act = nfp_net_run_xdp(xdp_prog, rxbuf->frag, hard_start,
&pkt_off, &pkt_len);
switch (act) {
case XDP_PASS:
meta_len_xdp = xdp.data - xdp.data_meta;
break;
case XDP_TX:
dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM;
@ -1785,6 +1773,8 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
if (rxd->rxd.flags & PCIE_DESC_RX_VLAN)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
le16_to_cpu(rxd->rxd.vlan));
if (meta_len_xdp)
skb_metadata_set(skb, meta_len_xdp);
napi_gro_receive(&rx_ring->r_vec->napi, skb);
}