From 347b5650cd158d1d953487cc2bec567af5c5bf96 Mon Sep 17 00:00:00 2001 From: Eryk Rybak Date: Thu, 18 Feb 2021 11:15:26 +0000 Subject: [PATCH] i40e: Fix kernel oops when i40e driver removes VF's 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 Signed-off-by: Grzegorz Szczurek Reviewed-by: Aleksandr Loktionov Tested-by: Konrad Jankowski Signed-off-by: Tony Nguyen --- 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 cd53981..15f93b3 100644 --- a/drivers/net/ethernet/intel/i40e/i40e.h +++ b/drivers/net/ethernet/intel/i40e/i40e.h @@ -142,6 +142,7 @@ enum i40e_state_t { __I40E_VIRTCHNL_OP_PENDING, __I40E_RECOVERY_MODE, __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 1b6ec9b..5d301a4 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); @@ -1574,6 +1580,8 @@ 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); @@ -1631,6 +1639,7 @@ 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 -- 2.7.4