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pping: Move packet_info to per-CPU map to save stack space

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Additions in the comming commits increase the maximum stack space used
by the eBPF programs past the 512 byte limit (causing verifier
rejection). To avoid this, move the relatively large packet_info
struct to a single-entry per-CPU array map.

Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
This commit is contained in:
Simon Sundberg
2023-10-17 18:55:31 +02:00
parent 2315d792fa
commit 9ebcc2a2f9
1 changed files with 27 additions and 10 deletions
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37
pping/pping_kern.c
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@@ -190,6 +190,12 @@ struct {
__uint(max_entries, 1);
} map_active_agg_instance SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
__type(key, __u32);
__type(value, struct packet_info);
__uint(max_entries, 1);
} map_packet_info SEC(".maps");
// Help functions
@@ -537,6 +543,7 @@ static int parse_packet_identifier(struct parsing_context *pctx,
struct icmp6hdr *icmp6h;
} transporth_ptr;
__builtin_memset(p_info, 0, sizeof(*p_info));
p_info->time = bpf_ktime_get_ns();
p_info->pkt_len = pctx->pkt_len;
proto = parse_ethhdr(&pctx->nh, pctx->data_end, &eth);
@@ -1229,28 +1236,38 @@ static void pping_parsed_packet(void *ctx, struct packet_info *p_info)
*/
static void pping_tc(struct __sk_buff *ctx, bool is_ingress)
{
struct packet_info p_info = { 0 };
struct packet_info *p_info;
__u32 key = 0;
if (parse_packet_identifer_tc(ctx, &p_info) < 0)
p_info = bpf_map_lookup_elem(&map_packet_info, &key);
if (!p_info)
return;
p_info.is_ingress = is_ingress;
p_info.ingress_ifindex = is_ingress ? ctx->ingress_ifindex : 0;
if (parse_packet_identifer_tc(ctx, p_info) < 0)
return;
pping_parsed_packet(ctx, &p_info);
p_info->is_ingress = is_ingress;
p_info->ingress_ifindex = is_ingress ? ctx->ingress_ifindex : 0;
pping_parsed_packet(ctx, p_info);
}
static void pping_xdp(struct xdp_md *ctx)
{
struct packet_info p_info = { 0 };
struct packet_info *p_info;
__u32 key = 0;
if (parse_packet_identifer_xdp(ctx, &p_info) < 0)
p_info = bpf_map_lookup_elem(&map_packet_info, &key);
if (!p_info)
return;
p_info.is_ingress = true;
p_info.ingress_ifindex = ctx->ingress_ifindex;
if (parse_packet_identifer_xdp(ctx, p_info) < 0)
return;
pping_parsed_packet(ctx, &p_info);
p_info->is_ingress = true;
p_info->ingress_ifindex = ctx->ingress_ifindex;
pping_parsed_packet(ctx, p_info);
}
static bool is_flow_old(struct network_tuple *flow, struct flow_state *f_state,