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I am writing a BPF_PROG_TYPE_SOCKET_OPS program and I am seeing the following in /sys/kernel/debug/tracing/trace_pipe :

<...>-12586 [001] ....  6972.409111: 0: update err: -95
when I load it due to the following snippet:
ret = bpf_sock_map_update(ops, &sock_ops, &idx, BPF_ANY);
if (ret < 0) {
    bpf_debug("update err: %d\n", ret);
How can I work out what -95 means? When I look in https://elixir.bootlin.com/linux/latest/source/arch/alpha/include/uapi/asm/errno.h I see:
#define ENOCSI      95  /* No CSI structure available */
Is this the correct way to find the meaning of the error? And what is the meaning of the description if so?
        
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