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sfc: handle XDP_TX outcomes of XDP eBPF programs

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Provide an ndo_xdp_xmit function that uses the XDP tx queue for this
CPU to send the packet.

Signed-off-by: Charles McLachlan <cmclachlan@solarflare.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Charles McLachlan
2019-10-31 10:24:12 +00:00
committed by David S. Miller
parent 3990a8fffb
commit dfe44c1f52
4 changed files with 116 additions and 1 deletions
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12
drivers/net/ethernet/sfc/rx.c
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@ -653,6 +653,7 @@ static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel,
u8 rx_prefix[EFX_MAX_RX_PREFIX_SIZE];
struct efx_rx_queue *rx_queue;
struct bpf_prog *xdp_prog;
struct xdp_frame *xdpf;
struct xdp_buff xdp;
u32 xdp_act;
s16 offset;
@ -713,7 +714,16 @@ static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel,
break;
case XDP_TX:
return -EOPNOTSUPP;
/* Buffer ownership passes to tx on success. */
xdpf = convert_to_xdp_frame(&xdp);
err = efx_xdp_tx_buffers(efx, 1, &xdpf, true);
if (unlikely(err != 1)) {
efx_free_rx_buffers(rx_queue, rx_buf, 1);
if (net_ratelimit())
netif_err(efx, rx_err, efx->net_dev,
"XDP TX failed (%d)\n", err);
}
break;
case XDP_REDIRECT:
err = xdp_do_redirect(efx->net_dev, &xdp, xdp_prog);