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ebpf: Fix indirections table setting

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The kernel documentation says:
> The value stored can be of any size, however, all array elements are
> aligned to 8 bytes.
https://www.kernel.org/doc/html/v6.8/bpf/map_array.html

Fixes: 333b3e5fab ("ebpf: Added eBPF map update through mmap.")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Acked-by: Andrew Melnychenko <andrew@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Akihiko Odaki 2024-03-27 11:05:10 +09:00 committed by Jason Wang
parent 1c188fc8cb
commit ba6bb2ec95
1 changed files with 7 additions and 2 deletions
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9
ebpf/ebpf_rss.c
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@ -185,13 +185,18 @@ static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
uint16_t *indirections_table, uint16_t *indirections_table,
size_t len) size_t len)
{ {
char *cursor = ctx->mmap_indirections_table;
if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL || if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL ||
len > VIRTIO_NET_RSS_MAX_TABLE_LEN) { len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
return false; return false;
} }
memcpy(ctx->mmap_indirections_table, indirections_table, for (size_t i = 0; i < len; i++) {
sizeof(*indirections_table) * len); *(uint16_t *)cursor = indirections_table[i];
cursor += 8;
}
return true; return true;
} }