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lpm: report error when defer queue overflows

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Coverity complains about unchecked return value of rte_rcu_qsbr_dq_enqueue.
By default, defer queue size is big enough to hold all tbl8 groups. When
enqueue fails, return error to the user to indicate system issue.

Coverity issue: 360832
Fixes: 8a9f8564e9 ("lpm: implement RCU rule reclamation")

Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
This commit is contained in:
Ruifeng Wang 2020-07-16 23:49:19 +08:00 committed by David Marchand
parent e1187407b4
commit 4cdd49f9b0
1 changed files with 13 additions and 6 deletions
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19
lib/librte_lpm/rte_lpm.c
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@ -532,11 +532,12 @@ tbl8_alloc(struct rte_lpm *lpm)
return group_idx;
}
static void
static int32_t
tbl8_free(struct rte_lpm *lpm, uint32_t tbl8_group_start)
{
struct rte_lpm_tbl_entry zero_tbl8_entry = {0};
struct __rte_lpm *internal_lpm;
int status;
internal_lpm = container_of(lpm, struct __rte_lpm, lpm);
if (internal_lpm->v == NULL) {
@ -552,9 +553,15 @@ tbl8_free(struct rte_lpm *lpm, uint32_t tbl8_group_start)
__ATOMIC_RELAXED);
} else if (internal_lpm->rcu_mode == RTE_LPM_QSBR_MODE_DQ) {
/* Push into QSBR defer queue. */
rte_rcu_qsbr_dq_enqueue(internal_lpm->dq,
status = rte_rcu_qsbr_dq_enqueue(internal_lpm->dq,
(void *)&tbl8_group_start);
if (status == 1) {
RTE_LOG(ERR, LPM, "Failed to push QSBR FIFO\n");
return -rte_errno;
}
}
return 0;
}
static __rte_noinline int32_t
@ -1040,7 +1047,7 @@ delete_depth_big(struct rte_lpm *lpm, uint32_t ip_masked,
#define group_idx next_hop
uint32_t tbl24_index, tbl8_group_index, tbl8_group_start, tbl8_index,
tbl8_range, i;
int32_t tbl8_recycle_index;
int32_t tbl8_recycle_index, status = 0;
/*
* Calculate the index into tbl24 and range. Note: All depths larger
@ -1097,7 +1104,7 @@ delete_depth_big(struct rte_lpm *lpm, uint32_t ip_masked,
*/
lpm->tbl24[tbl24_index].valid = 0;
__atomic_thread_fence(__ATOMIC_RELEASE);
tbl8_free(lpm, tbl8_group_start);
status = tbl8_free(lpm, tbl8_group_start);
} else if (tbl8_recycle_index > -1) {
/* Update tbl24 entry. */
struct rte_lpm_tbl_entry new_tbl24_entry = {
@ -1113,10 +1120,10 @@ delete_depth_big(struct rte_lpm *lpm, uint32_t ip_masked,
__atomic_store(&lpm->tbl24[tbl24_index], &new_tbl24_entry,
__ATOMIC_RELAXED);
__atomic_thread_fence(__ATOMIC_RELEASE);
tbl8_free(lpm, tbl8_group_start);
status = tbl8_free(lpm, tbl8_group_start);
}
#undef group_idx
return 0;
return status;
}
/*