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Message-ID: <20231121194504.GB16629@kernel.org> Date: Tue, 21 Nov 2023 19:45:04 +0000 From: Simon Horman <horms@...nel.org> To: Ivan Vecera <ivecera@...hat.com> Cc: intel-wired-lan@...ts.osuosl.org, Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony Nguyen <anthony.l.nguyen@...el.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org, Jacob Keller <jacob.e.keller@...el.com>, Wojciech Drewek <wojciech.drewek@...el.com>, mschmidt@...hat.com, netdev@...r.kernel.org Subject: Re: [PATCH iwl-next v3 3/5] i40e: Add helpers to find VSI and VEB by SEID and use them On Mon, Nov 20, 2023 at 06:55:42PM +0100, Ivan Vecera wrote: > > On 20. 11. 23 12:42, Simon Horman wrote: > > On Thu, Nov 16, 2023 at 04:21:12PM +0100, Ivan Vecera wrote: > > > Add two helpers i40e_(veb|vsi)_get_by_seid() to find corresponding > > > VEB or VSI by their SEID value and use these helpers to replace > > > existing open-coded loops. > > > > > > Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com> > > > Signed-off-by: Ivan Vecera <ivecera@...hat.com> > > > > Hi Ivan, > > > > some minor feedback from my side. > > > > ... > > > > > diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h > > > index 1e9266de270b..ca8997d29c02 100644 > > > --- a/drivers/net/ethernet/intel/i40e/i40e.h > > > +++ b/drivers/net/ethernet/intel/i40e/i40e.h > > > @@ -1360,4 +1360,38 @@ static inline struct i40e_pf *i40e_hw_to_pf(struct i40e_hw *hw) > > > struct device *i40e_hw_to_dev(struct i40e_hw *hw); > > > +/** > > > + * i40e_pf_get_vsi_by_seid - find VSI by SEID > > > + * @pf: pointer to a PF > > > > nit: @seid is missing here > > > > > + **/ > > > +static inline struct i40e_vsi * > > > +i40e_pf_get_vsi_by_seid(struct i40e_pf *pf, u16 seid) > > > +{ > > > + struct i40e_vsi *vsi; > > > + int i; > > > + > > > + i40e_pf_for_each_vsi(pf, i, vsi) > > > + if (vsi->seid == seid) > > > + return vsi; > > > + > > > + return NULL; > > > +} > > > + > > > +/** > > > + * i40e_pf_get_veb_by_seid - find VEB by SEID > > > + * @pf: pointer to a PF > > > > Ditto > > > > ... > > > > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c > > > > ... > > > > > @@ -14848,23 +14831,16 @@ struct i40e_veb *i40e_veb_setup(struct i40e_pf *pf, u16 flags, > > > } > > > /* make sure there is such a vsi and uplink */ > > > - i40e_pf_for_each_vsi(pf, vsi_idx, vsi) > > > - if (vsi->seid == vsi_seid) > > > - break; > > > - > > > - if (vsi_idx == pf->num_alloc_vsi && vsi_seid != 0) { > > > - dev_info(&pf->pdev->dev, "vsi seid %d not found\n", > > > - vsi_seid); > > > - return NULL; > > > + if (vsi_seid) { > > > + vsi = i40e_pf_get_vsi_by_seid(pf, vsi_seid); > > > + if (!vsi) { > > > + dev_err(&pf->pdev->dev, "vsi seid %d not found\n", > > > + vsi_seid); > > > + return NULL; > > > + } > > > } > > > - > > > if (uplink_seid && uplink_seid != pf->mac_seid) { > > > - i40e_pf_for_each_veb(pf, veb_idx, veb) { > > > - if (veb->seid == uplink_seid) { > > > - uplink_veb = veb; > > > - break; > > > - } > > > - } > > > + uplink_veb = i40e_pf_get_veb_by_seid(pf, uplink_seid); > > > if (!uplink_veb) { > > > dev_info(&pf->pdev->dev, > > > "uplink seid %d not found\n", uplink_seid); > > > > The next part of this function looks like this: > > > > if (!uplink_veb) { > > dev_info(&pf->pdev->dev, > > "uplink seid %d not found\n", uplink_seid); > > return NULL; > > } > > } > > /* get veb sw struct */ > > veb_idx = i40e_veb_mem_alloc(pf); > > if (veb_idx < 0) > > goto err_alloc; > > veb = pf->veb[veb_idx]; > > veb->flags = flags; > > veb->uplink_seid = uplink_seid; > > veb->veb_idx = (uplink_veb ? uplink_veb->idx : I40E_NO_VEB); > > veb->enabled_tc = (enabled_tc ? enabled_tc : 0x1); > > > > /* create the VEB in the switch */ > > ret = i40e_add_veb(veb, vsi); > > > > Smatch complains that vsi may be used uninitialised here. > > Which does seem possible to me if vsi_seid is 0. > > Yes, the support for floating VEBs is and WAS broken prior this patch and it > is fixed by the following patch. > > Prior this patch... Let's vsi_seid == 0: > > /* make sure there is such a vsi and uplink */ > i40e_pf_for_each_vsi(pf, vsi_idx, vsi) > if (vsi->seid == vsi_seid) > break; > -> here vsi_idx == pf->num_alloc_vsi because there cannot be VSI with SEID > == 0... and VSI points after the pf->vsi[] array. > > if (vsi_idx == pf->num_alloc_vsi && vsi_seid != 0) { > dev_info(&pf->pdev->dev, "vsi seid %d not found\n", > vsi_seid); > return NULL; > } > > This condition is not met, although vsi_idx == pf->num_alloc_vsi but > vsi_seid == 0 so the rest of code ended by: > > ret = i40e_add_veb(veb, vsi); > > and vsi pointer points to invalid area (item after the last one from > pf->vsi). > > As I mentioned the broken floating VEB functionality (where vsi_seid == 0 > and uplink_seid == 0) is fixed by the following patch. Thanks Ivan, I see that I flagged a false positive, sorry about that. I understand things quite a bit better after reading your explanation above.
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