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Improve comments on metadata

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This commit is contained in:
Herbert Wolverson 2024-02-29 08:28:33 -06:00
parent f84798885b
commit 9de53853e7
1 changed files with 4 additions and 1 deletions
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src/rust/lqos_sys/src/bpf/lqos_kern.c
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@ -171,7 +171,10 @@ int xdp_prog(struct xdp_md *ctx)
} }
__u32 cpu_dest = *cpu_lookup; __u32 cpu_dest = *cpu_lookup;
// Experimental: can we adjust the metadata? // Can we adjust the metadata? We'll try to do so, and if we can store the
// needed info there. Not all drivers support this, so it has to remain
// optional. This call invalidates the ctx->data pointer, so it has to be
// done last.
int ret = bpf_xdp_adjust_meta(ctx, -round_up(ETH_ALEN, sizeof(struct metadata_pass_t))); int ret = bpf_xdp_adjust_meta(ctx, -round_up(ETH_ALEN, sizeof(struct metadata_pass_t)));
if (ret < 0) { if (ret < 0) {
#ifdef VERBOSE #ifdef VERBOSE