EF_AF_XDP_ZEROCOPY for X2522 adapter

[boyracer2014]

Trying out a few XDP things including Onload/XDP. I build this with the --no-sfc flag.

It works fine:

[root]# onload --profile=latency-best ~/tcp_pingpong -s -l 10.0.0.1
oo:tcp_pingpong[459999]: Using Onload 9ade120 2025-01-22 master [0]
oo:tcp_pingpong[459999]: Copyright (c) 2002-2025 Advanced Micro Devices, Inc.
^C

However, adding the EF_AF_XDP_ZEROCOPY flags brings

[root]# EF_AF_XDP_ZEROCOPY=1 onload --profile=latency-best ~/tcp_pingpong -s -l 10.0.0.1
oo:tcp_pingpong[459944]: netif_tcp_helper_alloc_u: ERROR: Failed to allocate stack (rc=-95)
See kernel messages in dmesg or /var/log/syslog for more details of this failure
^C

Any suggestions what to check ?

dmesg does not really report anything

[260611.705669] [onload] [5]: WARNING: huge pages are incompatible with AF_XDP. Disabling hugepage support.
[260611.723604] [sfc efhw] af_xdp_flush_rx_dma_channel: FIXME AF_XDP
[260611.727675] [sfc efhw] af_xdp_flush_tx_dma_channel: FIXME AF_XDP

[boyracer2014]

fwiw, i am seeing the NOT activated from another program. Anything special on how to build the SFC driver for this in order to support it ?

if (xsk->index == 0) {
        struct xdp_options xdp_opts;
        socklen_t socklen = sizeof(xdp_opts);
        ret = getsockopt(xsk_socket__fd(xsk->socket), SOL_XDP,
            XDP_OPTIONS, &xdp_opts, &socklen);
        if (ret) {
            log("getsockopt(XDP_OPTIONS)", ret);
        } else if (xdp_opts.flags & XDP_OPTIONS_ZEROCOPY) {
            log_info("Zero copy is activated!");
        } else {
            log_info("Zero copy is NOT activated!");
        }
    }