From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
To: davem@davemloft.net
Cc: Anjali Singhai Jain <anjali.singhai@intel.com>,
netdev@vger.kernel.org, gospo@redhat.com, sassmann@redhat.com,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Subject: [net-next v2 10/12] i40e: rtnl_lock in reset path fixes
Date: Mon, 16 Dec 2013 01:38:56 -0800 [thread overview]
Message-ID: <1387186738-13666-11-git-send-email-jeffrey.t.kirsher@intel.com> (raw)
In-Reply-To: <1387186738-13666-1-git-send-email-jeffrey.t.kirsher@intel.com>
From: Anjali Singhai Jain <anjali.singhai@intel.com>
Any user-initiated path which eventually calls reset needs
to hold the rtnl_lock, so add functionality to do that.
Be careful not to use the safe reset when cleaning up
from the diagnostic tests, which avoids rtnl_lock
recursion from ethtool.
Protect the reset_task with rtnl_lock, since it runs from a work item.
Change-Id: Ib6e7a3fb2966809db2daf35fd5a123ccdf6f6f0f
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
drivers/net/ethernet/intel/i40e/i40e.h | 1 +
drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 8 ++++----
drivers/net/ethernet/intel/i40e/i40e_main.c | 19 ++++++++++++++++++-
3 files changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index eb1a3aa..24a47ee 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -502,6 +502,7 @@ int i40e_up(struct i40e_vsi *vsi);
void i40e_down(struct i40e_vsi *vsi);
extern const char i40e_driver_name[];
extern const char i40e_driver_version_str[];
+void i40e_do_reset_safe(struct i40e_pf *pf, u32 reset_flags);
void i40e_do_reset(struct i40e_pf *pf, u32 reset_flags);
void i40e_update_stats(struct i40e_vsi *vsi);
void i40e_update_eth_stats(struct i40e_vsi *vsi);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
index 9c675b5..9a59dda 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c
@@ -1462,19 +1462,19 @@ static ssize_t i40e_dbg_command_write(struct file *filp,
}
} else if (strncmp(cmd_buf, "pfr", 3) == 0) {
dev_info(&pf->pdev->dev, "forcing PFR\n");
- i40e_do_reset(pf, (1 << __I40E_PF_RESET_REQUESTED));
+ i40e_do_reset_safe(pf, (1 << __I40E_PF_RESET_REQUESTED));
} else if (strncmp(cmd_buf, "corer", 5) == 0) {
dev_info(&pf->pdev->dev, "forcing CoreR\n");
- i40e_do_reset(pf, (1 << __I40E_CORE_RESET_REQUESTED));
+ i40e_do_reset_safe(pf, (1 << __I40E_CORE_RESET_REQUESTED));
} else if (strncmp(cmd_buf, "globr", 5) == 0) {
dev_info(&pf->pdev->dev, "forcing GlobR\n");
- i40e_do_reset(pf, (1 << __I40E_GLOBAL_RESET_REQUESTED));
+ i40e_do_reset_safe(pf, (1 << __I40E_GLOBAL_RESET_REQUESTED));
} else if (strncmp(cmd_buf, "empr", 4) == 0) {
dev_info(&pf->pdev->dev, "forcing EMPR\n");
- i40e_do_reset(pf, (1 << __I40E_EMP_RESET_REQUESTED));
+ i40e_do_reset_safe(pf, (1 << __I40E_EMP_RESET_REQUESTED));
} else if (strncmp(cmd_buf, "read", 4) == 0) {
u32 address;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 73c9a20..19ad3c0 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4132,6 +4132,19 @@ void i40e_do_reset(struct i40e_pf *pf, u32 reset_flags)
}
/**
+ * i40e_do_reset_safe - Protected reset path for userland calls.
+ * @pf: board private structure
+ * @reset_flags: which reset is requested
+ *
+ **/
+void i40e_do_reset_safe(struct i40e_pf *pf, u32 reset_flags)
+{
+ rtnl_lock();
+ i40e_do_reset(pf, reset_flags);
+ rtnl_unlock();
+}
+
+/**
* i40e_handle_lan_overflow_event - Handler for LAN queue overflow event
* @pf: board private structure
* @e: event info posted on ARQ
@@ -4376,6 +4389,7 @@ static void i40e_reset_subtask(struct i40e_pf *pf)
{
u32 reset_flags = 0;
+ rtnl_lock();
if (test_bit(__I40E_REINIT_REQUESTED, &pf->state)) {
reset_flags |= (1 << __I40E_REINIT_REQUESTED);
clear_bit(__I40E_REINIT_REQUESTED, &pf->state);
@@ -4398,7 +4412,7 @@ static void i40e_reset_subtask(struct i40e_pf *pf)
*/
if (test_bit(__I40E_RESET_INTR_RECEIVED, &pf->state)) {
i40e_handle_reset_warning(pf);
- return;
+ goto unlock;
}
/* If we're already down or resetting, just bail */
@@ -4406,6 +4420,9 @@ static void i40e_reset_subtask(struct i40e_pf *pf)
!test_bit(__I40E_DOWN, &pf->state) &&
!test_bit(__I40E_CONFIG_BUSY, &pf->state))
i40e_do_reset(pf, reset_flags);
+
+unlock:
+ rtnl_unlock();
}
/**
--
1.8.3.1
next prev parent reply other threads:[~2013-12-16 9:39 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-16 9:38 [net-next v2 00/12][pull request] Intel Wired LAN Driver Updates Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 01/12] i40e: fix up some of the ethtool connection reporting Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 02/12] i40e: fix pf reset after offline test Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 03/12] i40e: Tell the stack about our actual number of queues Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 04/12] i40e: init flow control settings to disabled Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 05/12] i40e: trivial fixes Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 06/12] i40e: use same number of queues as CPUs Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 07/12] i40e: reinit flow for the main VSI Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 08/12] i40e: function to reconfigure RSS queues and rebuild Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 09/12] i40e: Add basic support for get/set channels for RSS Jeff Kirsher
2013-12-16 9:38 ` Jeff Kirsher [this message]
2013-12-16 9:38 ` [net-next v2 11/12] i40e: support for suspend and resume Jeff Kirsher
2013-12-16 9:38 ` [net-next v2 12/12] i40e: Remove FCoE in i40e_virtchnl_pf.c code Jeff Kirsher
2013-12-17 19:31 ` [net-next v2 00/12][pull request] Intel Wired LAN Driver Updates David Miller
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