From: Eryk Rybak eryk.roch.rybak@intel.com
[ Upstream commit 347b5650cd158d1d953487cc2bec567af5c5bf96 ]
Fix the reason of kernel oops when i40e driver removed VFs. Added new __I40E_VFS_RELEASING state to signalize releasing process by PF, that it makes possible to exit of reset VF procedure. Without this patch, it is possible to suspend the VFs reset by releasing VFs resources procedure. Retrying the reset after the timeout works on the freed VF memory causing a kernel oops.
Fixes: d43d60e5eb95 ("i40e: ensure reset occurs when disabling VF") Signed-off-by: Eryk Rybak eryk.roch.rybak@intel.com Signed-off-by: Grzegorz Szczurek grzegorzx.szczurek@intel.com Reviewed-by: Aleksandr Loktionov aleksandr.loktionov@intel.com Tested-by: Konrad Jankowski konrad0.jankowski@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/i40e/i40e.h | 1 + drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 9 +++++++++ 2 files changed, 10 insertions(+)
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h index 6fcf51baca131..375d0f6cb1ebe 100644 --- a/drivers/net/ethernet/intel/i40e/i40e.h +++ b/drivers/net/ethernet/intel/i40e/i40e.h @@ -150,6 +150,7 @@ enum i40e_state_t { __I40E_CLIENT_RESET, __I40E_VIRTCHNL_OP_PENDING, __I40E_VF_RESETS_DISABLED, /* disable resets during i40e_remove */ + __I40E_VFS_RELEASING, /* This must be last as it determines the size of the BITMAP */ __I40E_STATE_SIZE__, }; diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c index 9154abe13b93f..1aee6c452db6f 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c @@ -137,6 +137,7 @@ void i40e_vc_notify_vf_reset(struct i40e_vf *vf) **/ static inline void i40e_vc_disable_vf(struct i40e_vf *vf) { + struct i40e_pf *pf = vf->pf; int i;
i40e_vc_notify_vf_reset(vf); @@ -147,6 +148,11 @@ static inline void i40e_vc_disable_vf(struct i40e_vf *vf) * ensure a reset. */ for (i = 0; i < 20; i++) { + /* If PF is in VFs releasing state reset VF is impossible, + * so leave it. + */ + if (test_bit(__I40E_VFS_RELEASING, pf->state)) + return; if (i40e_reset_vf(vf, false)) return; usleep_range(10000, 20000); @@ -1381,6 +1387,8 @@ void i40e_free_vfs(struct i40e_pf *pf)
if (!pf->vf) return; + + set_bit(__I40E_VFS_RELEASING, pf->state); while (test_and_set_bit(__I40E_VF_DISABLE, pf->state)) usleep_range(1000, 2000);
@@ -1438,6 +1446,7 @@ void i40e_free_vfs(struct i40e_pf *pf) } } clear_bit(__I40E_VF_DISABLE, pf->state); + clear_bit(__I40E_VFS_RELEASING, pf->state); }
#ifdef CONFIG_PCI_IOV