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Subject: Re: [Intel-wired-lan] [PATCH iwl-net] i40e: Fix XDP program unloading while removing the driver X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wojciech Drewek , netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On Thu, May 16, 2024 at 06:41:08PM +0200, Michal Kubiak wrote: > The commit 6533e558c650 ("i40e: Fix reset path while removing > the driver") introduced a new PF state "__I40E_IN_REMOVE" to block > modifying the XDP program while the driver is being removed. > Unfortunately, such a change is useful only if the ".ndo_bpf()" > callback was called out of the rmmod context because unloading the > existing XDP program is also a part of driver removing procedure. > In other words, from the rmmod context the driver is expected to > unload the XDP program without reporting any errors. Otherwise, > the kernel warning with callstack is printed out to dmesg. > > Example failing scenario: > 1. Load the i40e driver. > 2. Load the XDP program. > 3. Unload the i40e driver (using "rmmod" command). > > Fix this by improving checks in ".ndo_bpf()" to determine if that > callback was called from the removing context and if the kernel > wants to unload the XDP program. Allow for unloading the XDP program > in such a case. > > Fixes: 6533e558c650 ("i40e: Fix reset path while removing the driver") > Reviewed-by: Wojciech Drewek > Signed-off-by: Michal Kubiak Acked-by: Maciej Fijalkowski > --- > drivers/net/ethernet/intel/i40e/i40e_main.c | 19 ++++++++++++++----- > 1 file changed, 14 insertions(+), 5 deletions(-) > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c > index ffb9f9f15c52..19fc043e351f 100644 > --- a/drivers/net/ethernet/intel/i40e/i40e_main.c > +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c > @@ -13264,6 +13264,20 @@ static int i40e_xdp_setup(struct i40e_vsi *vsi, struct bpf_prog *prog, > bool need_reset; > int i; > > + /* Called from netdev unregister context. Unload the XDP program. */ > + if (vsi->netdev->reg_state == NETREG_UNREGISTERING) { > + xdp_features_clear_redirect_target(vsi->netdev); > + old_prog = xchg(&vsi->xdp_prog, NULL); > + if (old_prog) > + bpf_prog_put(old_prog); > + > + return 0; > + } > + > + /* VSI shall be deleted in a moment, just return EINVAL */ > + if (test_bit(__I40E_IN_REMOVE, pf->state)) > + return -EINVAL; > + > /* Don't allow frames that span over multiple buffers */ > if (vsi->netdev->mtu > frame_size - I40E_PACKET_HDR_PAD) { > NL_SET_ERR_MSG_MOD(extack, "MTU too large for linear frames and XDP prog does not support frags"); > @@ -13272,14 +13286,9 @@ static int i40e_xdp_setup(struct i40e_vsi *vsi, struct bpf_prog *prog, > > /* When turning XDP on->off/off->on we reset and rebuild the rings. */ > need_reset = (i40e_enabled_xdp_vsi(vsi) != !!prog); > - > if (need_reset) > i40e_prep_for_reset(pf); > > - /* VSI shall be deleted in a moment, just return EINVAL */ > - if (test_bit(__I40E_IN_REMOVE, pf->state)) > - return -EINVAL; > - > old_prog = xchg(&vsi->xdp_prog, prog); > > if (need_reset) { > -- > 2.33.1 >