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Message-ID: <20240325200659.993749-4-anthony.l.nguyen@intel.com>
Date: Mon, 25 Mar 2024 13:06:47 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
kuba@...nel.org,
pabeni@...hat.com,
edumazet@...gle.com,
netdev@...r.kernel.org
Cc: Przemek Kitszel <przemyslaw.kitszel@...el.com>,
anthony.l.nguyen@...el.com,
Dan Carpenter <dan.carpenter@...aro.org>,
Michal Kubiak <michal.kubiak@...el.com>,
Shannon Nelson <shannon.nelson@....com>,
Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com>
Subject: [PATCH net 3/4] ixgbe: avoid sleeping allocation in ixgbe_ipsec_vf_add_sa()
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Change kzalloc() flags used in ixgbe_ipsec_vf_add_sa() to GFP_ATOMIC, to
avoid sleeping in IRQ context.
Dan Carpenter, with the help of Smatch, has found following issue:
The patch eda0333ac293: "ixgbe: add VF IPsec management" from Aug 13,
2018 (linux-next), leads to the following Smatch static checker
warning: drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c:917 ixgbe_ipsec_vf_add_sa()
warn: sleeping in IRQ context
The call tree that Smatch is worried about is:
ixgbe_msix_other() <- IRQ handler
-> ixgbe_msg_task()
-> ixgbe_rcv_msg_from_vf()
-> ixgbe_ipsec_vf_add_sa()
Fixes: eda0333ac293 ("ixgbe: add VF IPsec management")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Link: https://lore.kernel.org/intel-wired-lan/db31a0b0-4d9f-4e6b-aed8-88266eb5665c@moroto.mountain
Reviewed-by: Michal Kubiak <michal.kubiak@...el.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Reviewed-by: Shannon Nelson <shannon.nelson@....com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
index 13a6fca31004..866024f2b9ee 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
@@ -914,7 +914,13 @@ int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
goto err_out;
}
- xs = kzalloc(sizeof(*xs), GFP_KERNEL);
+ algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
+ if (unlikely(!algo)) {
+ err = -ENOENT;
+ goto err_out;
+ }
+
+ xs = kzalloc(sizeof(*xs), GFP_ATOMIC);
if (unlikely(!xs)) {
err = -ENOMEM;
goto err_out;
@@ -930,14 +936,8 @@ int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
xs->xso.dev = adapter->netdev;
- algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
- if (unlikely(!algo)) {
- err = -ENOENT;
- goto err_xs;
- }
-
aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
- xs->aead = kzalloc(aead_len, GFP_KERNEL);
+ xs->aead = kzalloc(aead_len, GFP_ATOMIC);
if (unlikely(!xs->aead)) {
err = -ENOMEM;
goto err_xs;
--
2.41.0
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