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Merged
alan-maguire merged 3 commits into from
Sep 5, 2023
Merged

Rl test #65

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e9f8793
fix comments in tcp conn tuner
alan-maguire Sep 4, 2023
68cc7d0
just use conn tuner for tests
alan-maguire Sep 4, 2023
86d1a1e
tcp_conn_tuner: fix verification errors for clang-14
alan-maguire Sep 5, 2023
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tcp_conn_tuner: fix verification errors for clang-14 
Signed-off-by: Alan Maguire <[email protected]>
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@alan-maguire
alan-maguire committed Sep 5, 2023
commit 86d1a1efc23e4df45dc35edf956c60b8a83685cd
29 changes: 12 additions & 17 deletions src/tcp_conn_tuner.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -130,41 +130,36 @@ int conn_tuner_sockops(struct bpf_sock_ops *ops)

/* find best (minimum) metric and use cong alg based on it. */
for (i = 0; i < NUM_TCP_CONN_METRICS; i++) {
cands[i] = 0;
metric_value = remote_host->metrics[i].metric_value;
bpftune_debug("conn_tuner: addr 0x%x cong '%s' metric_value %lld\n",
ops->remote_ip4, congs[i], metric_value);

if (metric_value > metric_min)
continue;
if (metric_value < metric_min) {
else if (metric_value < metric_min) {
cands[0] = i;
ncands = 1;
} else if (metric_value == metric_min) {
cands[ncands++] = i;
cands[ncands] = i;
ncands++;
}
metric_min = metric_value;
}
/* if multiple min values, choose randomly. */
if (ncands > 1) {
int choice = bpf_get_prandom_u32() % ncands;
if (ncands > 1 && ncands <= NUM_TCP_CONN_METRICS) {
__u32 choice = bpf_get_prandom_u32() % ncands;

/* verifier refused to believe the index used was valid;
* unroll the mapping from choice to cands[] index to
* keep verification happy.
*/
/* verifier complains about variable stack offset */
switch (choice) {
case 0:
minindex = cands[0];
break;
minindex = cands[0]; break;
case 1:
minindex = cands[1];
break;
minindex = cands[1]; break;
case 2:
minindex = cands[2];
break;
minindex = cands[2]; break;
case 3:
minindex = cands[3];
break;
minindex = cands[3]; break;
default:
return 1;
}
Expand All @@ -173,7 +168,7 @@ int conn_tuner_sockops(struct bpf_sock_ops *ops)
} else {
return 1;
}
minindex &= 0x3;
minindex &= (NUM_TCP_CONN_METRICS - 1);
/* choose random alg 5% of the time (1/20) */
s = epsilon_greedy(minindex, NUM_TCP_CONN_METRICS, 20);
if (s != minindex) {
Expand Down