* [dpdk-stable] [PATCH v2 3/3] net/mlx5: fix invalid counter query
[not found] ` <1595404727-164521-1-git-send-email-suanmingm@mellanox.com>
@ 2020-07-22 7:58 ` Suanming Mou
0 siblings, 0 replies; only message in thread
From: Suanming Mou @ 2020-07-22 7:58 UTC (permalink / raw)
To: viacheslavo, matan; +Cc: rasland, dev, stable
Currently, the counter query requires the counter ID should start
with 4 aligned. In none-batch mode, the counter pool might have the
chance to get the counter ID not 4 aligned. In this case, the counter
should be skipped, or the query will be failed.
Skip the counter with ID not 4 aligned as the first counter in the
none-batch count pool to avoid invalid counter query. Once having
new min_dcs ID in the poll less than the skipped counters, the
skipped counters will be returned to the pool free list to use.
Fixes: 5382d28c2110 ("net/mlx5: accelerate DV flow counter transactions")
Cc: stable@dpdk.org
Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
---
drivers/net/mlx5/mlx5.h | 6 ++-
drivers/net/mlx5/mlx5_flow.c | 6 +++
drivers/net/mlx5/mlx5_flow_dv.c | 94 ++++++++++++++++++++++++++++++++++++++++-
3 files changed, 103 insertions(+), 3 deletions(-)
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 5d7d609..0ecfc76 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -366,8 +366,9 @@ struct mlx5_flow_counter {
struct mlx5_flow_counter_ext {
uint32_t shared:1; /**< Share counter ID with other flow rules. */
uint32_t batch: 1;
+ uint32_t skipped:1; /* This counter is skipped or not. */
/**< Whether the counter was allocated by batch command. */
- uint32_t ref_cnt:30; /**< Reference counter. */
+ uint32_t ref_cnt:29; /**< Reference counter. */
uint32_t id; /**< User counter ID. */
union { /**< Holds the counters for the rule. */
#if defined(HAVE_IBV_DEVICE_COUNTERS_SET_V42)
@@ -390,8 +391,9 @@ struct mlx5_flow_counter_pool {
rte_atomic64_t a64_dcs;
};
/* The devx object of the minimum counter ID. */
- uint32_t index:29; /* Pool index in container. */
+ uint32_t index:28; /* Pool index in container. */
uint32_t type:2; /* Memory type behind the counter array. */
+ uint32_t skip_cnt:1; /* Pool contains skipped counter. */
volatile uint32_t query_gen:1; /* Query round. */
rte_spinlock_t sl; /* The pool lock. */
struct mlx5_counter_stats_raw *raw;
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index b56bee4..40a8575 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -5974,6 +5974,11 @@ struct mlx5_meter_domains_infos *
goto set_alarm;
dcs = (struct mlx5_devx_obj *)(uintptr_t)rte_atomic64_read
(&pool->a64_dcs);
+ if (dcs->id & (MLX5_CNT_BATCH_QUERY_ID_ALIGNMENT - 1)) {
+ /* Pool without valid counter. */
+ pool->raw_hw = NULL;
+ goto next_pool;
+ }
offset = batch ? 0 : dcs->id % MLX5_COUNTERS_PER_POOL;
/*
* Identify the counters released between query trigger and query
@@ -5998,6 +6003,7 @@ struct mlx5_meter_domains_infos *
pool->raw_hw->min_dcs_id = dcs->id;
LIST_REMOVE(pool->raw_hw, next);
sh->cmng.pending_queries++;
+next_pool:
pool_index++;
if (pool_index >= rte_atomic16_read(&cont->n_valid)) {
batch ^= 0x1;
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 2fc4457..a2b7329 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -4408,6 +4408,66 @@ struct field_modify_info modify_tcp[] = {
}
/**
+ * Restore skipped counters in the pool.
+ *
+ * As counter pool query requires the first counter dcs
+ * ID start with 4 alinged, if the pool counters with
+ * min_dcs ID are not aligned with 4, the counters will
+ * be skipped.
+ * Once other min_dcs ID less than these skipped counter
+ * dcs ID appears, the skipped counters will be safe to
+ * use.
+ * Should be called when min_dcs is updated.
+ *
+ * @param[in] pool
+ * Current counter pool.
+ * @param[in] last_min_dcs
+ * Last min_dcs.
+ */
+static void
+flow_dv_counter_restore(struct mlx5_flow_counter_pool *pool,
+ struct mlx5_devx_obj *last_min_dcs)
+{
+ struct mlx5_flow_counter_ext *cnt_ext;
+ uint32_t offset, new_offset;
+ uint32_t skip_cnt = 0;
+ uint32_t i;
+
+ if (!pool->skip_cnt)
+ return;
+ /*
+ * If last min_dcs is not valid. The skipped counter may even after
+ * last min_dcs, set the offset to the whole pool.
+ */
+ if (last_min_dcs->id & (MLX5_CNT_BATCH_QUERY_ID_ALIGNMENT - 1))
+ offset = MLX5_COUNTERS_PER_POOL;
+ else
+ offset = last_min_dcs->id % MLX5_COUNTERS_PER_POOL;
+ new_offset = pool->min_dcs->id % MLX5_COUNTERS_PER_POOL;
+ /*
+ * Check the counters from 1 to the last_min_dcs range. Counters
+ * before new min_dcs indicates pool still has skipped counters.
+ * Counters be skipped after new min_dcs will be ready to use.
+ * Offset 0 counter must be empty or min_dcs, start from 1.
+ */
+ for (i = 1; i < offset; i++) {
+ cnt_ext = MLX5_GET_POOL_CNT_EXT(pool, i);
+ if (cnt_ext->skipped) {
+ if (i > new_offset) {
+ cnt_ext->skipped = 0;
+ TAILQ_INSERT_TAIL
+ (&pool->counters[pool->query_gen],
+ MLX5_POOL_GET_CNT(pool, i), next);
+ } else {
+ skip_cnt++;
+ }
+ }
+ }
+ if (!skip_cnt)
+ pool->skip_cnt = 0;
+}
+
+/**
* Prepare a new counter and/or a new counter pool.
*
* @param[in] dev
@@ -4432,6 +4492,7 @@ struct field_modify_info modify_tcp[] = {
struct mlx5_pools_container *cont;
struct mlx5_flow_counter_pool *pool;
struct mlx5_counters tmp_tq;
+ struct mlx5_devx_obj *last_min_dcs;
struct mlx5_devx_obj *dcs = NULL;
struct mlx5_flow_counter *cnt;
uint32_t add2other;
@@ -4466,13 +4527,44 @@ struct field_modify_info modify_tcp[] = {
}
}
}
- if (dcs->id < pool->min_dcs->id)
+ if ((dcs->id < pool->min_dcs->id ||
+ pool->min_dcs->id &
+ (MLX5_CNT_BATCH_QUERY_ID_ALIGNMENT - 1)) &&
+ !(dcs->id & (MLX5_CNT_BATCH_QUERY_ID_ALIGNMENT - 1))) {
+ /*
+ * Update the pool min_dcs only if current dcs is
+ * valid and exist min_dcs is not valid or greater
+ * than new dcs.
+ */
+ last_min_dcs = pool->min_dcs;
rte_atomic64_set(&pool->a64_dcs,
(int64_t)(uintptr_t)dcs);
+ /*
+ * Restore any skipped counters if the new min_dcs
+ * ID is smaller or min_dcs is not valid.
+ */
+ if (dcs->id < last_min_dcs->id ||
+ last_min_dcs->id &
+ (MLX5_CNT_BATCH_QUERY_ID_ALIGNMENT - 1))
+ flow_dv_counter_restore(pool, last_min_dcs);
+ }
i = dcs->id % MLX5_COUNTERS_PER_POOL;
cnt = MLX5_POOL_GET_CNT(pool, i);
cnt->pool = pool;
MLX5_GET_POOL_CNT_EXT(pool, i)->dcs = dcs;
+ /*
+ * If min_dcs is not valid, it means the new allocated dcs
+ * also fail to become the valid min_dcs, just skip it.
+ * Or if min_dcs is valid, and new dcs ID is smaller than
+ * min_dcs, but not become the min_dcs, also skip it.
+ */
+ if (pool->min_dcs->id &
+ (MLX5_CNT_BATCH_QUERY_ID_ALIGNMENT - 1) ||
+ dcs->id < pool->min_dcs->id) {
+ MLX5_GET_POOL_CNT_EXT(pool, i)->skipped = 1;
+ pool->skip_cnt = 1;
+ goto retry;
+ }
if (add2other) {
TAILQ_INSERT_TAIL(&pool->counters[pool->query_gen],
cnt, next);
--
1.8.3.1
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