From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jakub Kicinski Subject: [PATCH net 2/3] nfp: make sure representors are destroyed before their lower netdev Date: Tue, 22 Aug 2017 23:22:43 -0700 Message-ID: <20170823062244.26580-3-jakub.kicinski@netronome.com> References: <20170823062244.26580-1-jakub.kicinski@netronome.com> Cc: oss-drivers@netronome.com, Jakub Kicinski To: netdev@vger.kernel.org Return-path: Received: from mail-pg0-f44.google.com ([74.125.83.44]:32862 "EHLO mail-pg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751988AbdHWGWw (ORCPT ); Wed, 23 Aug 2017 02:22:52 -0400 Received: by mail-pg0-f44.google.com with SMTP id t3so3900087pgt.0 for ; Tue, 22 Aug 2017 23:22:52 -0700 (PDT) In-Reply-To: <20170823062244.26580-1-jakub.kicinski@netronome.com> Sender: netdev-owner@vger.kernel.org List-ID: App start/stop callbacks can perform application initialization. Unfortunately, flower app started using them for creating and destroying representors. This can lead to a situation where lower vNIC netdev is destroyed while representors still try to pass traffic. This will most likely lead to a NULL-dereference on the lower netdev TX path. Move the start/stop callbacks, so that representors are created/ destroyed when vNICs are fully initialized. Fixes: 5de73ee46704 ("nfp: general representor implementation") Signed-off-by: Jakub Kicinski Reviewed-by: Simon Horman --- drivers/net/ethernet/netronome/nfp/nfp_net_main.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c index 5797dbf2b507..1aca4e57bf41 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c @@ -456,10 +456,6 @@ static int nfp_net_pf_app_start(struct nfp_pf *pf) { int err; - err = nfp_net_pf_app_start_ctrl(pf); - if (err) - return err; - err = nfp_app_start(pf->app, pf->ctrl_vnic); if (err) goto err_ctrl_stop; @@ -484,7 +480,6 @@ static void nfp_net_pf_app_stop(struct nfp_pf *pf) if (pf->num_vfs) nfp_app_sriov_disable(pf->app); nfp_app_stop(pf->app); - nfp_net_pf_app_stop_ctrl(pf); } static void nfp_net_pci_unmap_mem(struct nfp_pf *pf) @@ -559,7 +554,7 @@ static int nfp_net_pci_map_mem(struct nfp_pf *pf) static void nfp_net_pci_remove_finish(struct nfp_pf *pf) { - nfp_net_pf_app_stop(pf); + nfp_net_pf_app_stop_ctrl(pf); /* stop app first, to avoid double free of ctrl vNIC's ddir */ nfp_net_debugfs_dir_clean(&pf->ddir); @@ -690,6 +685,7 @@ int nfp_net_pci_probe(struct nfp_pf *pf) { struct nfp_net_fw_version fw_ver; u8 __iomem *ctrl_bar, *qc_bar; + struct nfp_net *nn; int stride; int err; @@ -766,7 +762,7 @@ int nfp_net_pci_probe(struct nfp_pf *pf) if (err) goto err_free_vnics; - err = nfp_net_pf_app_start(pf); + err = nfp_net_pf_app_start_ctrl(pf); if (err) goto err_free_irqs; @@ -774,12 +770,20 @@ int nfp_net_pci_probe(struct nfp_pf *pf) if (err) goto err_stop_app; + err = nfp_net_pf_app_start(pf); + if (err) + goto err_clean_vnics; + mutex_unlock(&pf->lock); return 0; +err_clean_vnics: + list_for_each_entry(nn, &pf->vnics, vnic_list) + if (nfp_net_is_data_vnic(nn)) + nfp_net_pf_clean_vnic(pf, nn); err_stop_app: - nfp_net_pf_app_stop(pf); + nfp_net_pf_app_stop_ctrl(pf); err_free_irqs: nfp_net_pf_free_irqs(pf); err_free_vnics: @@ -803,6 +807,8 @@ void nfp_net_pci_remove(struct nfp_pf *pf) if (list_empty(&pf->vnics)) goto out; + nfp_net_pf_app_stop(pf); + list_for_each_entry(nn, &pf->vnics, vnic_list) if (nfp_net_is_data_vnic(nn)) nfp_net_pf_clean_vnic(pf, nn); -- 2.11.0