[{"id":3678096,"web_url":"http://patchwork.ozlabs.org/comment/3678096/","msgid":"","list_archive_url":null,"date":"2026-04-16T11:12:53","subject":"Re: [Intel-wired-lan] [PATCH iwl-net] i40e: keep q_vectors array in\n sync with channel count changes","submitter":{"id":77750,"url":"http://patchwork.ozlabs.org/api/people/77750/","name":"Maciej Fijalkowski","email":"maciej.fijalkowski@intel.com"},"content":"On Tue, Apr 14, 2026 at 02:14:05PM +0200, Maciej Fijalkowski wrote:\n> For the main VSI, i40e_set_num_rings_in_vsi() always derives\n> num_q_vectors from pf->num_lan_msix. At the same time, ethtool -L stores\n> the user requested channel count in vsi->req_queue_pairs and the queue\n> setup path uses that value for the effective number of queue pairs.\n> \n> This leaves queue and vector counts out of sync after shrinking channel\n> count via ethtool -L. The active queue configuration is reduced, but the\n> VSI still keeps the full PF-sized q_vector topology.\n> \n> That mismatch breaks reconfiguration flows which rely on vector/NAPI\n> state matching the effective channel configuration. In particular,\n> toggling /sys/class/net//threaded after reducing the channel count\n> can hang, and later channel-count changes can fail because VSI reinit\n> does not rebuild q_vectors to match the new vector count.\n> \n> Fix this by making the main VSI num_q_vectors follow the effective\n> requested channel count, capped by the available MSI-X vectors. Update\n> i40e_vsi_reinit_setup() to rebuild q_vectors during VSI reinit so the\n> vector topology is refreshed together with the ring arrays when channel\n> count changes.\n> \n> Keep alloc_queue_pairs unchanged and based on pf->num_lan_qps so the VSI\n> retains its full queue capacity.\n> \n> Selftest napi_threaded.py was originally used when Jakub reported hang\n> on /sys/class/net//threaded toggle. In order to make it pass on\n> i40e, use persistent NAPI configuration for q_vector NAPIs so NAPI\n> identity and threaded settings survive q_vector reallocation across\n> channel-count changes. This is achieved by using netif_napi_add_config()\n> when configuring q_vectors.\n> \n> $ export NETIF=ens259f1np1\n> $ sudo -E env PATH=\"$PATH\" ./tools/testing/selftests/drivers/net/napi_threaded.py\n> TAP version 13\n> 1..3\n> ok 1 napi_threaded.napi_init\n> ok 2 napi_threaded.change_num_queues\n> ok 3 napi_threaded.enable_dev_threaded_disable_napi_threaded\n> Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0\n> \n> Reported-by: Jakub Kicinski \n> Closes: https://lore.kernel.org/intel-wired-lan/20260316133100.6054a11f@kernel.org/\n> Fixes: d2a69fefd756 (\"i40e: Fix changing previously set num_queue_pairs for PFs\")\n> Signed-off-by: Maciej Fijalkowski \n> ---\n> drivers/net/ethernet/intel/i40e/i40e_main.c | 34 +++++++++++++++++----\n> 1 file changed, 28 insertions(+), 6 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c\n> index 926d001b2150..5636ad71f940 100644\n> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c\n> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c\n> @@ -11403,10 +11403,14 @@ static void i40e_service_timer(struct timer_list *t)\n> static int i40e_set_num_rings_in_vsi(struct i40e_vsi *vsi)\n> {\n> \tstruct i40e_pf *pf = vsi->back;\n> +\tu16 qps;\n> \n> \tswitch (vsi->type) {\n> \tcase I40E_VSI_MAIN:\n> \t\tvsi->alloc_queue_pairs = pf->num_lan_qps;\n> +\t\tqps = vsi->req_queue_pairs ?\n> +\t\t min_t(u16, vsi->req_queue_pairs, pf->num_lan_qps) :\n> +\t\t pf->num_lan_qps;\n> \t\tif (!vsi->num_tx_desc)\n> \t\t\tvsi->num_tx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,\n> \t\t\t\t\t\t I40E_REQ_DESCRIPTOR_MULTIPLE);\n> @@ -11414,7 +11418,8 @@ static int i40e_set_num_rings_in_vsi(struct i40e_vsi *vsi)\n> \t\t\tvsi->num_rx_desc = ALIGN(I40E_DEFAULT_NUM_DESCRIPTORS,\n> \t\t\t\t\t\t I40E_REQ_DESCRIPTOR_MULTIPLE);\n> \t\tif (test_bit(I40E_FLAG_MSIX_ENA, pf->flags))\n> -\t\t\tvsi->num_q_vectors = pf->num_lan_msix;\n> +\t\t\tvsi->num_q_vectors = max_t(int, 1,\n> +\t\t\t\t\t\t min_t(int, qps, pf->num_lan_msix));\n> \t\telse\n> \t\t\tvsi->num_q_vectors = 1;\n> \n> @@ -12043,7 +12048,8 @@ static int i40e_vsi_alloc_q_vector(struct i40e_vsi *vsi, int v_idx)\n> \tcpumask_copy(&q_vector->affinity_mask, cpu_possible_mask);\n> \n> \tif (vsi->netdev)\n> -\t\tnetif_napi_add(vsi->netdev, &q_vector->napi, i40e_napi_poll);\n> +\t\tnetif_napi_add_config(vsi->netdev, &q_vector->napi,\n> +\t\t\t\t i40e_napi_poll, v_idx);\n> \n> \t/* tie q_vector and vsi together */\n> \tvsi->q_vectors[v_idx] = q_vector;\n> @@ -14265,12 +14271,27 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)\n> \n> \tpf = vsi->back;\n> \n> +\tif (test_bit(I40E_FLAG_MSIX_ENA, pf->flags)) {\n> +\t\ti40e_put_lump(pf->irq_pile, vsi->base_vector, vsi->idx);\n> +\t\tvsi->base_vector = 0;\n> +\t}\n> +\n> \ti40e_put_lump(pf->qp_pile, vsi->base_queue, vsi->idx);\n> \ti40e_vsi_clear_rings(vsi);\n> \n> -\ti40e_vsi_free_arrays(vsi, false);\n> +\ti40e_vsi_free_q_vectors(vsi);\n> +\ti40e_vsi_free_arrays(vsi, true);\n> \ti40e_set_num_rings_in_vsi(vsi);\n> -\tret = i40e_vsi_alloc_arrays(vsi, false);\n> +\n> +\tret = i40e_vsi_alloc_arrays(vsi, true);\n> +\tif (ret)\n> +\t\tgoto err_vsi;\n\nSashiko warns about potential double-free on vsi->tx_rings. I will send a\nv2 where I include NULLing this ptr in i40e_vsi_alloc_arrays().\n\nThanks,\nMaciej\n\n> +\n> +\t/* Rebuild q_vectors during VSI reinit because the effective channel\n> +\t * count may change num_q_vectors. Keep vector topology aligned with the\n> +\t * queue configuration after ethtool's .set_channels() callback.\n> +\t */\n> +\tret = i40e_vsi_setup_vectors(vsi);\n> \tif (ret)\n> \t\tgoto err_vsi;\n> \n> @@ -14282,7 +14303,7 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)\n> \t\tdev_info(&pf->pdev->dev,\n> \t\t\t \"failed to get tracking for %d queues for VSI %d err %d\\n\",\n> \t\t\t alloc_queue_pairs, vsi->seid, ret);\n> -\t\tgoto err_vsi;\n> +\t\tgoto err_lump;\n> \t}\n> \tvsi->base_queue = ret;\n> \n> @@ -14306,7 +14327,6 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)\n> \treturn vsi;\n> \n> err_rings:\n> -\ti40e_vsi_free_q_vectors(vsi);\n> \tif (vsi->netdev_registered) {\n> \t\tvsi->netdev_registered = false;\n> \t\tunregister_netdev(vsi->netdev);\n> @@ -14316,6 +14336,8 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)\n> \tif (vsi->type == I40E_VSI_MAIN)\n> \t\ti40e_devlink_destroy_port(pf);\n> \ti40e_aq_delete_element(&pf->hw, vsi->seid, NULL);\n> +err_lump:\n> +\ti40e_vsi_free_q_vectors(vsi);\n> err_vsi:\n> \ti40e_vsi_clear(vsi);\n> \treturn NULL;\n> -- \n> 2.43.0\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=G2aVCMZn;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::137; 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