enum cfg_options_flags {
NO_TOUCH = 0x0U,
READ_MEM = 0x1U,
+ SWAP_MAC = 0x2U,
};
struct bpf_map_def SEC("maps") config_map = {
.type = BPF_MAP_TYPE_ARRAY,
.max_entries = MAX_RXQs + 1,
};
+static __always_inline
+void swap_src_dst_mac(void *data)
+{
+ unsigned short *p = data;
+ unsigned short dst[3];
+
+ dst[0] = p[0];
+ dst[1] = p[1];
+ dst[2] = p[2];
+ p[0] = p[3];
+ p[1] = p[4];
+ p[2] = p[5];
+ p[3] = dst[0];
+ p[4] = dst[1];
+ p[5] = dst[2];
+}
+
SEC("xdp_prog0")
int xdp_prognum0(struct xdp_md *ctx)
{
rxq_rec->issue++;
/* Default: Don't touch packet data, only count packets */
- if (unlikely(config->options & READ_MEM)) {
+ if (unlikely(config->options & (READ_MEM|SWAP_MAC))) {
struct ethhdr *eth = data;
if (eth + 1 > data_end)
/* Avoid compiler removing this: Drop non 802.3 Ethertypes */
if (ntohs(eth->h_proto) < ETH_P_802_3_MIN)
return XDP_ABORTED;
+
+ /* XDP_TX requires changing MAC-addrs, else HW may drop.
+ * Can also be enabled with --swapmac (for test purposes)
+ */
+ if (unlikely(config->options & SWAP_MAC))
+ swap_src_dst_mac(data);
}
return config->action;
{"no-separators", no_argument, NULL, 'z' },
{"action", required_argument, NULL, 'a' },
{"readmem", no_argument, NULL, 'r' },
+ {"swapmac", no_argument, NULL, 'm' },
{0, 0, NULL, 0 }
};
enum cfg_options_flags {
NO_TOUCH = 0x0U,
READ_MEM = 0x1U,
+ SWAP_MAC = 0x2U,
};
#define XDP_ACTION_MAX (XDP_TX + 1)
#define XDP_ACTION_MAX_STRLEN 11
{
if (flag == NO_TOUCH)
return "no_touch";
+ if (flag & SWAP_MAC)
+ return "swapmac";
if (flag & READ_MEM)
return "read";
fprintf(stderr, "ERR: Unknown config option flags");
case 'r':
cfg_options |= READ_MEM;
break;
+ case 'm':
+ cfg_options |= SWAP_MAC;
+ break;
case 'h':
error:
default:
}
}
cfg.action = action;
+
+ /* XDP_TX requires changing MAC-addrs, else HW may drop */
+ if (action == XDP_TX)
+ cfg_options |= SWAP_MAC;
cfg.options = cfg_options;
/* Trick to pretty printf with thousands separators use %' */