Vector PMD returns buffers to the application without setting the pointers
in the Rx queue to null nor allocating them. When the PMD cleanup the ring
it needs to take a special care to those pointers to not free the mbufs
before the application have used them nor if the application have already
freed them.
Signed-off-by: Nelio Laranjeiro <nelio.laranje...@6wind.com>
Acked-by: Yongseok Koh <ys...@mellanox.com>
---
drivers/net/mlx5/mlx5_rxq.c | 54 ++++++++++++++++----------------------------
drivers/net/mlx5/mlx5_rxtx.h | 3 +--
2 files changed, 20 insertions(+), 37 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index de54175..2119dfa 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -634,32 +634,6 @@ priv_rehash_flows(struct priv *priv)
}
/**
- * Unlike regular Rx function, vPMD Rx doesn't replace mbufs immediately when
- * receiving packets. Instead it replaces later in bulk. In rxq->elts[],
entries
- * from rq_pi to rq_ci are owned by device but the rest is already delivered to
- * application. In order not to reuse those mbufs by rxq_alloc_elts(), this
- * function must be called to replace used mbufs.
- *
- * @param rxq
- * Pointer to RX queue structure.
- */
-static void
-rxq_trim_elts(struct rxq *rxq)
-{
- const uint16_t q_n = (1 << rxq->elts_n);
- const uint16_t q_mask = q_n - 1;
- uint16_t used = q_n - (rxq->rq_ci - rxq->rq_pi);
- uint16_t i;
-
- if (!rxq->trim_elts)
- return;
- for (i = 0; i < used; ++i)
- (*rxq->elts)[(rxq->rq_ci + i) & q_mask] = NULL;
- rxq->trim_elts = 0;
- return;
-}
-
-/**
* Allocate RX queue elements.
*
* @param rxq_ctrl
@@ -730,7 +704,6 @@ rxq_alloc_elts(struct rxq_ctrl *rxq_ctrl, unsigned int
elts_n)
/* Padding with a fake mbuf for vectorized Rx. */
for (i = 0; i < MLX5_VPMD_DESCS_PER_LOOP; ++i)
(*rxq->elts)[elts_n + i] = &rxq->fake_mbuf;
- rxq->trim_elts = 1;
}
DEBUG("%p: allocated and configured %u segments (max %u packets)",
(void *)rxq_ctrl, elts_n, elts_n / (1 << rxq_ctrl->rxq.sges_n));
@@ -757,17 +730,28 @@ rxq_alloc_elts(struct rxq_ctrl *rxq_ctrl, unsigned int
elts_n)
static void
rxq_free_elts(struct rxq_ctrl *rxq_ctrl)
{
- unsigned int i;
+ struct rxq *rxq = &rxq_ctrl->rxq;
+ const uint16_t q_n = (1 << rxq->elts_n);
+ const uint16_t q_mask = q_n - 1;
+ uint16_t used = q_n - (rxq->rq_ci - rxq->rq_pi);
+ uint16_t i;
- rxq_trim_elts(&rxq_ctrl->rxq);
DEBUG("%p: freeing WRs", (void *)rxq_ctrl);
- if (rxq_ctrl->rxq.elts == NULL)
+ if (rxq->elts == NULL)
return;
-
- for (i = 0; (i != (1u << rxq_ctrl->rxq.elts_n)); ++i) {
- if ((*rxq_ctrl->rxq.elts)[i] != NULL)
- rte_pktmbuf_free_seg((*rxq_ctrl->rxq.elts)[i]);
- (*rxq_ctrl->rxq.elts)[i] = NULL;
+ /**
+ * Some mbuf in the Ring belongs to the application. They cannot be
+ * freed.
+ */
+ if (rxq_check_vec_support(rxq) > 0) {
+ for (i = 0; i < used; ++i)
+ (*rxq->elts)[(rxq->rq_ci + i) & q_mask] = NULL;
+ rxq->rq_pi = rxq->rq_ci;
+ }
+ for (i = 0; (i != (1u << rxq->elts_n)); ++i) {
+ if ((*rxq->elts)[i] != NULL)
+ rte_pktmbuf_free_seg((*rxq->elts)[i]);
+ (*rxq->elts)[i] = NULL;
}
}
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index d85ea16..39b217b 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -116,8 +116,7 @@ struct rxq {
unsigned int rss_hash:1; /* RSS hash result is enabled. */
unsigned int mark:1; /* Marked flow available on the queue. */
unsigned int pending_err:1; /* CQE error needs to be handled. */
- unsigned int trim_elts:1; /* Whether elts needs clean-up. */
- unsigned int :6; /* Remaining bits. */
+ unsigned int :7; /* Remaining bits. */
volatile uint32_t *rq_db;
volatile uint32_t *cq_db;
uint16_t rq_ci;
--
2.1.4
