[dpdk-dev] [PATCH] net/tap: fix invalid queue file descriptor

[dpdk-dev] [PATCH] net/tap: fix invalid queue file descriptor

[Pengzhen Liu]

From: Keith Wiles <keith.wiles@intel.com>

Rx and Tx queues share the common tap file descriptor, but save this
value separately.

Setting up Rx/Tx queue sets up both queues, release_queue close the
tap file but update file descriptor only for that queue.

This makes other queue's file descriptor invalid.

As a workaround, prevent release_queue callback to be called by default.

This is done by separating Rx/Tx setup functions, so that each only
setup its own queue, this prevents rte_eth_rx/tx_queue_setup() calling
release_queue before setup_queue.

Fixes: 02f96a0a82d1 ("net/tap: add TUN/TAP device PMD")

Signed-off-by: Keith Wiles <keith.wiles@intel.com>
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
 drivers/net/tap/rte_eth_tap.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index c0afc2d..91f63f5 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -428,8 +428,6 @@ struct pmd_internals {
 			}
 		}
 	}
-	dev->data->rx_queues[qid] = rx;
-	dev->data->tx_queues[qid] = tx;
 
 	rx->fd = fd;
 	tx->fd = fd;
@@ -438,6 +436,26 @@ struct pmd_internals {
 }
 
 static int
+rx_setup_queue(struct rte_eth_dev *dev,
+		struct pmd_internals *internals,
+		uint16_t qid)
+{
+	dev->data->rx_queues[qid] = &internals->rxq[qid];
+
+	return tap_setup_queue(dev, internals, qid);
+}
+
+static int
+tx_setup_queue(struct rte_eth_dev *dev,
+		struct pmd_internals *internals,
+		uint16_t qid)
+{
+	dev->data->tx_queues[qid] = &internals->txq[qid];
+
+	return tap_setup_queue(dev, internals, qid);
+}
+
+static int
 tap_rx_queue_setup(struct rte_eth_dev *dev,
 		   uint16_t rx_queue_id,
 		   uint16_t nb_rx_desc __rte_unused,
@@ -469,7 +487,7 @@ struct pmd_internals {
 		return -ENOMEM;
 	}
 
-	fd = tap_setup_queue(dev, internals, rx_queue_id);
+	fd = rx_setup_queue(dev, internals, rx_queue_id);
 	if (fd == -1)
 		return -1;
 
@@ -493,7 +511,7 @@ struct pmd_internals {
 	if (tx_queue_id >= internals->nb_queues)
 		return -1;
 
-	ret = tap_setup_queue(dev, internals, tx_queue_id);
+	ret = tx_setup_queue(dev, internals, tx_queue_id);
 	if (ret == -1)
 		return -1;
 
-- 
1.7.12.4

Re: [dpdk-dev] [PATCH] net/tap: fix invalid queue file descriptor

[Ferruh Yigit]

On 10/26/2017 2:51 AM, Pengzhen Liu wrote:
> From: Keith Wiles <keith.wiles@intel.com>
> 
> Rx and Tx queues share the common tap file descriptor, but save this
> value separately.
> 
> Setting up Rx/Tx queue sets up both queues, release_queue close the
> tap file but update file descriptor only for that queue.
> 
> This makes other queue's file descriptor invalid.
> 
> As a workaround, prevent release_queue callback to be called by default.
> 
> This is done by separating Rx/Tx setup functions, so that each only
> setup its own queue, this prevents rte_eth_rx/tx_queue_setup() calling
> release_queue before setup_queue.
> 
> Fixes: 02f96a0a82d1 ("net/tap: add TUN/TAP device PMD")
> 
> Signed-off-by: Keith Wiles <keith.wiles@intel.com>
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

Hi Pengzhen,

This is a commit from repo :) [1] from beginning of the year.

I assume this has been sent instead of another patch by mistake, please double
check if intended patch sent to mail list.

[1]
http://dpdk.org/commit/0002ca58