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* [PATCH] failsafe: fix segfault on hotplug event
@ 2022-11-10 16:34 Luc Pelletier
  2022-11-10 17:42 ` [PATCH v2] " Luc Pelletier
                   ` (9 more replies)
  0 siblings, 10 replies; 16+ messages in thread
From: Luc Pelletier @ 2022-11-10 16:34 UTC (permalink / raw)
  To: grive; +Cc: dev, Luc Pelletier, Konstantin Ananyev, stable

When the failsafe PMD encounters a hotplug event, it switches its rx/tx
functions to "safe" ones that validate the sub-device's rx/tx functions
before calling them. It switches the rx/tx functions by changing the
function pointers in the rte_eth_dev structure.

Following commit 7a0935239b, the rx/tx functions of PMDs are no longer
called through the function pointers in the rte_eth_dev structure. They
are rather called through a flat array named rte_eth_fp_ops. The
function pointers in that array are initialized when the devices start
and are initialized.

When a hotplug event occurs, the function pointers in rte_eth_fp_ops
still point to the "unsafe" rx/tx functions in the failsafe PMD since
they haven't been updated. This results in a segmentation fault because
it ends up using the "unsafe" functions, when the "safe" functions
should have been used.

To fix the problem, the failsafe PMD code was changed to update the
function pointers in the rte_eth_fp_ops array when a hotplug event
occurs.

Fixes: 7a0935239b ("ethdev: make fast-path functions to use new flat array")
Cc: Konstantin Ananyev <konstantin.ananyev@intel.com>
Cc: stable@dpdk.org

Signed-off-by: Luc Pelletier <lucp.at.work@gmail.com>
---
 drivers/net/failsafe/failsafe_rxtx.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/failsafe/failsafe_rxtx.c b/drivers/net/failsafe/failsafe_rxtx.c
index fe67293299..34d59dfbb1 100644
--- a/drivers/net/failsafe/failsafe_rxtx.c
+++ b/drivers/net/failsafe/failsafe_rxtx.c
@@ -5,6 +5,7 @@
 
 #include <rte_atomic.h>
 #include <rte_debug.h>
+#include <rte_ethdev.h>
 #include <rte_mbuf.h>
 #include <ethdev_driver.h>
 
@@ -44,9 +45,13 @@ failsafe_set_burst_fn(struct rte_eth_dev *dev, int force_safe)
 		DEBUG("Using safe RX bursts%s",
 		      (force_safe ? " (forced)" : ""));
 		dev->rx_pkt_burst = &failsafe_rx_burst;
+		rte_eth_fp_ops[dev->data->port_id].rx_pkt_burst =
+			&failsafe_rx_burst;
 	} else if (!need_safe && safe_set) {
 		DEBUG("Using fast RX bursts");
 		dev->rx_pkt_burst = &failsafe_rx_burst_fast;
+		rte_eth_fp_ops[dev->data->port_id].rx_pkt_burst =
+			&failsafe_rx_burst_fast;
 	}
 	need_safe = force_safe || fs_tx_unsafe(TX_SUBDEV(dev));
 	safe_set = (dev->tx_pkt_burst == &failsafe_tx_burst);
@@ -54,9 +59,13 @@ failsafe_set_burst_fn(struct rte_eth_dev *dev, int force_safe)
 		DEBUG("Using safe TX bursts%s",
 		      (force_safe ? " (forced)" : ""));
 		dev->tx_pkt_burst = &failsafe_tx_burst;
+		rte_eth_fp_ops[dev->data->port_id].tx_pkt_burst =
+			&failsafe_tx_burst;
 	} else if (!need_safe && safe_set) {
 		DEBUG("Using fast TX bursts");
 		dev->tx_pkt_burst = &failsafe_tx_burst_fast;
+		rte_eth_fp_ops[dev->data->port_id].tx_pkt_burst =
+			&failsafe_tx_burst_fast;
 	}
 	rte_wmb();
 }
-- 
2.25.1


^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2023-10-31 17:35 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-11-10 16:34 [PATCH] failsafe: fix segfault on hotplug event Luc Pelletier
2022-11-10 17:42 ` [PATCH v2] " Luc Pelletier
2022-11-10 23:33   ` Stephen Hemminger
2022-11-16 17:35 ` [PATCH] " Konstantin Ananyev
2022-11-16 21:51   ` Luc Pelletier
2022-11-16 22:25     ` Stephen Hemminger
2022-11-18 16:31       ` Konstantin Ananyev
2022-11-29 14:48 ` [PATCH v3 1/5] " Luc Pelletier
2023-10-31 17:35   ` Stephen Hemminger
2022-11-29 14:48 ` [PATCH v3 3/5] failsafe: fix double release of port Luc Pelletier
2022-11-29 14:48 ` [PATCH v3 4/5] failsafe: use public APIs in fs_link_update Luc Pelletier
2022-11-29 14:48 ` [PATCH v3 5/5] failsafe: make sub-device remove flag thread-safe Luc Pelletier
2022-11-29 15:25 ` [PATCH v4 1/5] failsafe: fix segfault on hotplug event Luc Pelletier
2022-11-29 15:25 ` [PATCH v4 3/5] failsafe: fix double release of port Luc Pelletier
2022-11-29 15:25 ` [PATCH v4 4/5] failsafe: use public APIs in fs_link_update Luc Pelletier
2022-11-29 15:25 ` [PATCH v4 5/5] failsafe: make sub-device remove flag thread-safe Luc Pelletier

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