diff mbox series

net/mlx4: fix buffer leakage on device close

Message ID 20210417171414.6117-1-viacheslavo@nvidia.com (mailing list archive)
State Accepted
Delegated to: Raslan Darawsheh
Headers show
Series net/mlx4: fix buffer leakage on device close | expand

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Context Check Description
ci/iol-abi-testing success Testing PASS
ci/iol-testing success Testing PASS
ci/iol-intel-Performance success Performance Testing PASS
ci/github-robot success github build: passed
ci/travis-robot success travis build: passed
ci/intel-Testing success Testing PASS
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Slava Ovsiienko April 17, 2021, 5:14 p.m. UTC
The mlx4 PMD tracks the buffers (mbufs) for the packets being
transmitted in the dedicated array named as "elts". The tx_burst
routine frees the mbufs from this array once it needs to rearm
the hardware descriptor and store the new mbuf, so it looks
like as replacement mbuf pointer in the elts array.

On the device stop mlx4 PMD freed only the part of elts according
tail and head pointers, leaking the rest of buffers, remained in
the elts array.

Fixes: a2ce2121c01c ("net/mlx4: separate Tx configuration functions")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx4/mlx4_rxtx.c |  4 ----
 drivers/net/mlx4/mlx4_txq.c  | 19 +++++++++----------
 2 files changed, 9 insertions(+), 14 deletions(-)

Comments

Raslan Darawsheh April 28, 2021, 9:15 a.m. UTC | #1
Hi,

> -----Original Message-----
> From: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
> Sent: Saturday, April 17, 2021 8:14 PM
> To: dev@dpdk.org
> Cc: stable@dpdk.org; Raslan Darawsheh <rasland@nvidia.com>; Matan
> Azrad <matan@nvidia.com>; Ori Kam <orika@nvidia.com>
> Subject: [PATCH] net/mlx4: fix buffer leakage on device close
> 
> The mlx4 PMD tracks the buffers (mbufs) for the packets being transmitted
> in the dedicated array named as "elts". The tx_burst routine frees the mbufs
> from this array once it needs to rearm the hardware descriptor and store the
> new mbuf, so it looks like as replacement mbuf pointer in the elts array.
> 
> On the device stop mlx4 PMD freed only the part of elts according tail and
> head pointers, leaking the rest of buffers, remained in the elts array.
> 
> Fixes: a2ce2121c01c ("net/mlx4: separate Tx configuration functions")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh
diff mbox series

Patch

diff --git a/drivers/net/mlx4/mlx4_rxtx.c b/drivers/net/mlx4/mlx4_rxtx.c
index adc1c9bf81..ecf08f53cf 100644
--- a/drivers/net/mlx4/mlx4_rxtx.c
+++ b/drivers/net/mlx4/mlx4_rxtx.c
@@ -921,10 +921,6 @@  mlx4_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
 		if (likely(elt->buf != NULL)) {
 			struct rte_mbuf *tmp = elt->buf;
 
-#ifdef RTE_LIBRTE_MLX4_DEBUG
-			/* Poisoning. */
-			memset(&elt->buf, 0x66, sizeof(struct rte_mbuf *));
-#endif
 			/* Faster than rte_pktmbuf_free(). */
 			do {
 				struct rte_mbuf *next = tmp->next;
diff --git a/drivers/net/mlx4/mlx4_txq.c b/drivers/net/mlx4/mlx4_txq.c
index 31ab308050..2df26842fb 100644
--- a/drivers/net/mlx4/mlx4_txq.c
+++ b/drivers/net/mlx4/mlx4_txq.c
@@ -206,19 +206,18 @@  mlx4_tx_uar_uninit_secondary(struct rte_eth_dev *dev __rte_unused)
 static void
 mlx4_txq_free_elts(struct txq *txq)
 {
-	unsigned int elts_head = txq->elts_head;
-	unsigned int elts_tail = txq->elts_tail;
 	struct txq_elt (*elts)[txq->elts_n] = txq->elts;
-	unsigned int elts_m = txq->elts_n - 1;
+	unsigned int n = txq->elts_n;
 
-	DEBUG("%p: freeing WRs", (void *)txq);
-	while (elts_tail != elts_head) {
-		struct txq_elt *elt = &(*elts)[elts_tail++ & elts_m];
+	DEBUG("%p: freeing WRs, %u", (void *)txq, n);
+	while (n--) {
+		struct txq_elt *elt = &(*elts)[n];
 
-		MLX4_ASSERT(elt->buf != NULL);
-		rte_pktmbuf_free(elt->buf);
-		elt->buf = NULL;
-		elt->wqe = NULL;
+		if (elt->buf) {
+			rte_pktmbuf_free(elt->buf);
+			elt->buf = NULL;
+			elt->wqe = NULL;
+		}
 	}
 	txq->elts_tail = txq->elts_head;
 }