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authorPatrice Buriez <patrice.buriez@intel.com>2018-07-07 14:03:32 +0200
committerDeepak S <deepak.s@linux.intel.com>2018-08-15 01:56:21 +0530
commitfc6a8370e48cdf5fc9a77ab8e428c00c7b3e4093 (patch)
tree021905fcb10fa77918e8bf757f8feeec6fe0bf73
parent692702c10772e13b533c908ed3f95a430ad476ce (diff)
Fix potential crash with latency accuracystable/fraser
Detect, remember and skip bad/unexpected packets: - too short to hold the latency-related values - with bad signature - with invalid generator_id using a uint64_t-based bitmap. Also moved variable declarations closer to usage, added some likely/unlikely hints, reworked some return statements, and fixed 32-bit overflow (every ~4s) of rx_time_err computation. Change-Id: Ib2aadc1af6b7a68601cc080ba66b10d41ff9a64e Signed-off-by: Patrice Buriez <patrice.buriez@intel.com>
-rw-r--r--VNFs/DPPD-PROX/handle_lat.c118
1 files changed, 73 insertions, 45 deletions
diff --git a/VNFs/DPPD-PROX/handle_lat.c b/VNFs/DPPD-PROX/handle_lat.c
index d7706c3..8285686 100644
--- a/VNFs/DPPD-PROX/handle_lat.c
+++ b/VNFs/DPPD-PROX/handle_lat.c
@@ -106,6 +106,7 @@ struct task_lat {
struct lat_test lt[2];
struct lat_test *lat_test;
uint32_t generator_count;
+ uint16_t min_pkt_len;
struct early_loss_detect *eld;
struct rx_pkt_meta_data *rx_pkt_meta;
uint64_t link_speed;
@@ -428,20 +429,10 @@ static void task_lat_store_lat_buf(struct task_lat *task, uint64_t rx_packet_ind
lat_info->tx_err = tx_err;
}
-static uint32_t task_lat_early_loss_detect(struct task_lat *task, struct unique_id *unique_id)
+static uint32_t task_lat_early_loss_detect(struct task_lat *task, uint32_t packet_id, uint8_t generator_id)
{
- struct early_loss_detect *eld;
- uint8_t generator_id;
- uint32_t packet_index;
-
- unique_id_get(unique_id, &generator_id, &packet_index);
-
- if (generator_id >= task->generator_count)
- return 0;
-
- eld = &task->eld[generator_id];
-
- return early_loss_detect_add(eld, packet_index);
+ struct early_loss_detect *eld = &task->eld[generator_id];
+ return early_loss_detect_add(eld, packet_id);
}
static uint64_t tsc_extrapolate_backward(uint64_t link_speed, uint64_t tsc_from, uint64_t bytes, uint64_t tsc_minimum)
@@ -502,8 +493,6 @@ static int task_lat_can_store_latency(struct task_lat *task)
static void task_lat_store_lat(struct task_lat *task, uint64_t rx_packet_index, uint64_t rx_time, uint64_t tx_time, uint64_t rx_error, uint64_t tx_error, uint32_t packet_id, uint8_t generator_id)
{
- if (tx_time == 0)
- return;
uint32_t lat_tsc = diff_time(rx_time, tx_time) << LATENCY_ACCURACY;
lat_test_add_latency(task->lat_test, lat_tsc, rx_error + tx_error);
@@ -516,9 +505,6 @@ static void task_lat_store_lat(struct task_lat *task, uint64_t rx_packet_index,
static int handle_lat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
struct task_lat *task = (struct task_lat *)tbase;
- uint64_t rx_time_err;
-
- uint32_t pkt_rx_time, pkt_tx_time;
// If link is down, link_speed is 0
if (unlikely(task->link_speed == 0)) {
@@ -540,8 +526,11 @@ static int handle_lat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uin
task_lat_update_lat_test(task);
- const uint64_t rx_tsc = tbase->aux->tsc_rx.after;
- uint32_t tx_time_err = 0;
+ // Remember those packets with bad length or bad signature
+ uint64_t pkt_bad_len_sig[(MAX_RX_PKT_ALL + 63) / 64];
+#define BIT64_SET(a64, bit) a64[bit / 64] |= (((uint64_t)1) << (bit & 63))
+#define BIT64_CLR(a64, bit) a64[bit / 64] &= ~(((uint64_t)1) << (bit & 63))
+#define BIT64_TEST(a64, bit) a64[bit / 64] & (((uint64_t)1) << (bit & 63))
/* Go once through all received packets and read them. If
packet has just been modified by another core, the cost of
@@ -549,17 +538,28 @@ static int handle_lat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uin
for (uint16_t j = 0; j < n_pkts; ++j) {
struct rte_mbuf *mbuf = mbufs[j];
task->rx_pkt_meta[j].hdr = rte_pktmbuf_mtod(mbuf, uint8_t *);
+
+ // Remember those packets which are too short to hold the values that we expect
+ if (unlikely(rte_pktmbuf_pkt_len(mbuf) < task->min_pkt_len))
+ BIT64_SET(pkt_bad_len_sig, j);
+ else
+ BIT64_CLR(pkt_bad_len_sig, j);
}
- if (task->sig) {
+ if (task->sig_pos) {
for (uint16_t j = 0; j < n_pkts; ++j) {
- if (*(uint32_t *)(task->rx_pkt_meta[j].hdr + task->sig_pos) == task->sig)
+ if (unlikely(BIT64_TEST(pkt_bad_len_sig, j)))
+ continue;
+ // Remember those packets with bad signature
+ if (likely(*(uint32_t *)(task->rx_pkt_meta[j].hdr + task->sig_pos) == task->sig))
task->rx_pkt_meta[j].pkt_tx_time = *(uint32_t *)(task->rx_pkt_meta[j].hdr + task->lat_pos);
else
- task->rx_pkt_meta[j].pkt_tx_time = 0;
+ BIT64_SET(pkt_bad_len_sig, j);
}
} else {
for (uint16_t j = 0; j < n_pkts; ++j) {
+ if (unlikely(BIT64_TEST(pkt_bad_len_sig, j)))
+ continue;
task->rx_pkt_meta[j].pkt_tx_time = *(uint32_t *)(task->rx_pkt_meta[j].hdr + task->lat_pos);
}
}
@@ -573,37 +573,50 @@ static int handle_lat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uin
bytes_total_in_bulk += mbuf_wire_size(mbufs[flipped]);
}
- pkt_rx_time = tsc_extrapolate_backward(task->link_speed, rx_tsc, task->rx_pkt_meta[0].bytes_after_in_bulk, task->last_pkts_tsc) >> LATENCY_ACCURACY;
- if ((uint32_t)((task->begin >> LATENCY_ACCURACY)) > pkt_rx_time) {
+ const uint64_t rx_tsc = tbase->aux->tsc_rx.after;
+
+ uint64_t rx_time_err;
+ uint64_t pkt_rx_time64 = tsc_extrapolate_backward(task->link_speed, rx_tsc, task->rx_pkt_meta[0].bytes_after_in_bulk, task->last_pkts_tsc) >> LATENCY_ACCURACY;
+ if (unlikely((task->begin >> LATENCY_ACCURACY) > pkt_rx_time64)) {
// Extrapolation went up to BEFORE begin => packets were stuck in the NIC but we were not seeing them
- rx_time_err = pkt_rx_time - (uint32_t)(task->last_pkts_tsc >> LATENCY_ACCURACY);
+ rx_time_err = pkt_rx_time64 - (task->last_pkts_tsc >> LATENCY_ACCURACY);
} else {
- rx_time_err = pkt_rx_time - (uint32_t)(task->begin >> LATENCY_ACCURACY);
+ rx_time_err = pkt_rx_time64 - (task->begin >> LATENCY_ACCURACY);
}
- struct unique_id *unique_id = NULL;
- struct delayed_latency_entry *delayed_latency_entry;
- uint32_t packet_id, generator_id;
-
for (uint16_t j = 0; j < n_pkts; ++j) {
+ // Used to display % of packets within accuracy limit vs. total number of packets (used_col)
+ task->lat_test->tot_all_pkts++;
+
+ // Skip those packets with bad length or bad signature
+ if (unlikely(BIT64_TEST(pkt_bad_len_sig, j)))
+ continue;
+
struct rx_pkt_meta_data *rx_pkt_meta = &task->rx_pkt_meta[j];
uint8_t *hdr = rx_pkt_meta->hdr;
- pkt_rx_time = tsc_extrapolate_backward(task->link_speed, rx_tsc, rx_pkt_meta->bytes_after_in_bulk, task->last_pkts_tsc) >> LATENCY_ACCURACY;
- pkt_tx_time = rx_pkt_meta->pkt_tx_time;
+ uint32_t pkt_rx_time = tsc_extrapolate_backward(task->link_speed, rx_tsc, rx_pkt_meta->bytes_after_in_bulk, task->last_pkts_tsc) >> LATENCY_ACCURACY;
+ uint32_t pkt_tx_time = rx_pkt_meta->pkt_tx_time;
+ uint8_t generator_id;
+ uint32_t packet_id;
if (task->unique_id_pos) {
- unique_id = (struct unique_id *)(hdr + task->unique_id_pos);
+ struct unique_id *unique_id = (struct unique_id *)(hdr + task->unique_id_pos);
+ unique_id_get(unique_id, &generator_id, &packet_id);
+
+ if (unlikely(generator_id >= task->generator_count)) {
+ /* No need to remember unexpected packet at this stage
+ BIT64_SET(pkt_bad_len_sig, j);
+ */
+ // Skip unexpected packet
+ continue;
+ }
- uint32_t n_loss = task_lat_early_loss_detect(task, unique_id);
- packet_id = unique_id->packet_id;
- generator_id = unique_id->generator_id;
- lat_test_add_lost(task->lat_test, n_loss);
+ lat_test_add_lost(task->lat_test, task_lat_early_loss_detect(task, packet_id, generator_id));
} else {
- packet_id = task->rx_packet_index;
generator_id = 0;
+ packet_id = task->rx_packet_index;
}
- task->lat_test->tot_all_pkts++;
/* If accuracy is enabled, latency is reported with a
delay of ACCURACY_BUFFER_SIZE packets since the generator puts the
@@ -611,9 +624,9 @@ static int handle_lat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uin
ensures that all reported latencies have both rx
and tx error. */
if (task->accur_pos) {
- tx_time_err = *(uint32_t *)(hdr + task->accur_pos);
+ uint32_t tx_time_err = *(uint32_t *)(hdr + task->accur_pos);
- delayed_latency_entry = delayed_latency_get(task->delayed_latency_entries, generator_id, packet_id - ACCURACY_BUFFER_SIZE);
+ struct delayed_latency_entry *delayed_latency_entry = delayed_latency_get(task->delayed_latency_entries, generator_id, packet_id - ACCURACY_BUFFER_SIZE);
if (delayed_latency_entry) {
task_lat_store_lat(task,
@@ -636,13 +649,15 @@ static int handle_lat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uin
} else {
task_lat_store_lat(task, task->rx_packet_index, pkt_rx_time, pkt_tx_time, 0, 0, packet_id, generator_id);
}
+
+ // Bad/unexpected packets do not need to be indexed
task->rx_packet_index++;
}
- int ret;
- ret = task->base.tx_pkt(&task->base, mbufs, n_pkts, NULL);
+
task->begin = tbase->aux->tsc_rx.before;
task->last_pkts_tsc = tbase->aux->tsc_rx.after;
- return ret;
+
+ return task->base.tx_pkt(&task->base, mbufs, n_pkts, NULL);
}
static void init_task_lat_latency_buffer(struct task_lat *task, uint32_t core_id)
@@ -728,6 +743,19 @@ static void init_task_lat(struct task_base *tbase, struct task_args *targ)
task->unique_id_pos = targ->packet_id_pos;
task->latency_buffer_size = targ->latency_buffer_size;
+ PROX_PANIC(task->lat_pos == 0, "Missing 'lat pos' parameter in config file\n");
+ uint16_t min_pkt_len = task->lat_pos + sizeof(uint32_t);
+ if (task->unique_id_pos && (
+ min_pkt_len < task->unique_id_pos + sizeof(struct unique_id)))
+ min_pkt_len = task->unique_id_pos + sizeof(struct unique_id);
+ if (task->accur_pos && (
+ min_pkt_len < task->accur_pos + sizeof(uint32_t)))
+ min_pkt_len = task->accur_pos + sizeof(uint32_t);
+ if (task->sig_pos && (
+ min_pkt_len < task->sig_pos + sizeof(uint32_t)))
+ min_pkt_len = task->sig_pos + sizeof(uint32_t);
+ task->min_pkt_len = min_pkt_len;
+
task_init_generator_count(task);
if (task->latency_buffer_size) {