[{"id":3684003,"web_url":"http://patchwork.ozlabs.org/comment/3684003/","msgid":"","list_archive_url":null,"date":"2026-04-29T11:28:25","subject":"Re: [Intel-wired-lan] [PATCH net v5 3/4] iavf: send MAC change\n request synchronously","submitter":{"id":75597,"url":"http://patchwork.ozlabs.org/api/people/75597/","name":"Loktionov, Aleksandr","email":"aleksandr.loktionov@intel.com"},"content":"> -----Original Message-----\n> From: Jose Ignacio Tornos Martinez \n> Sent: Wednesday, April 29, 2026 12:24 PM\n> To: netdev@vger.kernel.org\n> Cc: intel-wired-lan@lists.osuosl.org; Kitszel, Przemyslaw\n> ; Loktionov, Aleksandr\n> ; Keller, Jacob E\n> ; horms@kernel.org;\n> jesse.brandeburg@intel.com; Nguyen, Anthony L\n> ; davem@davemloft.net;\n> edumazet@google.com; kuba@kernel.org; pabeni@redhat.com; Jose Ignacio\n> Tornos Martinez ; stable@vger.kernel.org\n> Subject: [PATCH net v5 3/4] iavf: send MAC change request\n> synchronously\n> \n> After commit ad7c7b2172c3 (\"net: hold netdev instance lock during\n> sysfs operations\"), iavf_set_mac() is called with the netdev instance\n> lock already held.\n> \n> The function queues a MAC address change request via\n> iavf_replace_primary_mac() and then waits for completion. However, in\n> the current flow, the actual virtchnl message is sent by the watchdog\n> task, which also needs to acquire the netdev lock to run.\n> Additionally, the adminq_task which processes virtchnl responses also\n> needs the netdev lock.\n> \n> This creates a deadlock scenario:\n> 1. iavf_set_mac() holds netdev lock and waits for MAC change 2.\n> Watchdog needs netdev lock to send the request -> blocked 3. Even if\n> request is sent, adminq_task needs netdev lock to process\n> PF response -> blocked\n> 4. MAC change times out after 2.5 seconds 5. iavf_set_mac() returns -\n> EAGAIN\n> \n> This particularly affects VFs during bonding setup when multiple VFs\n> are enslaved in quick succession.\n> \n> Fix by implementing a synchronous MAC change operation similar to the\n> approach used in commit fdadbf6e84c4 (\"iavf: fix incorrect reset\n> handling in callbacks\").\n> \n> The solution:\n> 1. Send the virtchnl ADD_ETH_ADDR message directly (not via watchdog)\n> 2. Poll the admin queue hardware directly for responses 3. Process all\n> received messages (including non-MAC messages) 4. Return when MAC\n> change completes or times out\n> \n> A new generic function iavf_poll_virtchnl_response() is introduced\n> that can be reused for any future synchronous virtchnl operations. It\n> takes a callback to check completion, allowing flexible condition\n> checking.\n> \n> This allows the operation to complete synchronously while holding\n> netdev_lock, without relying on watchdog or adminq_task. The function\n> can sleep for up to 2.5 seconds polling hardware, but this is\n> acceptable since netdev_lock is per-device and only serializes\n> operations on the same interface.\n> \n> To support this, change iavf_add_ether_addrs() to return an error code\n> instead of void, allowing callers to detect failures. Additionally,\n> export iavf_mac_add_reject() to enable proper rollback on local\n> failures (timeouts, send errors) - PF rejections are already handled\n> automatically by iavf_virtchnl_completion().\n> \n> Remove vc_waitqueue entirely because iavf_set_mac was the only waiter\n> on this waitqueue and after the changes it is not needed.\n> \n> Fixes: ad7c7b2172c3 (\"net: hold netdev instance lock during sysfs\n> operations\")\n> cc: stable@vger.kernel.org\n> Signed-off-by: Jose Ignacio Tornos Martinez \n> ---\n> v5: Address the comments from Przemek Kitszel:\n> - Add note in commit message about vc_waitqueue removal.\n> - Change kdoc to use \"Return:\" instead of \"Returns\"\n> - kdoc should end with '*/' not '**/' (new functions or with\n> changes in the\n> prototypes)\n> - Sort lines from longest to shortest\n> (iavf_poll_virtchnl_response)\n> - Avoid \"sleep then check time\" (iavf_poll_virtchnl_response)\n> Address AI review (sashiko.dev) from Simon Horman:\n> - Restore adapter->hw.mac.addr on local failure (complete rollback\n> in iavf_set_mac)\n> - Remove timeout current_op clearing to prevent overlapping\n> command\n> race, the status can be controlled from outside and better to\n> not\n> corrupt it (iavf_poll_virtchnl_response) (as in v3).\n> v4: https://lore.kernel.org/all/20260423130405.139568-4-\n> jtornosm@redhat.com/\n> \n> drivers/net/ethernet/intel/iavf/iavf.h | 10 +-\n> drivers/net/ethernet/intel/iavf/iavf_main.c | 71 +++++++++----\n> .../net/ethernet/intel/iavf/iavf_virtchnl.c | 100 ++++++++++++++++-\n> -\n> 3 files changed, 151 insertions(+), 30 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/iavf/iavf.h\n> b/drivers/net/ethernet/intel/iavf/iavf.h\n> index e9fb0a0919e3..78fa3df06e11 100644\n> --- a/drivers/net/ethernet/intel/iavf/iavf.h\n> +++ b/drivers/net/ethernet/intel/iavf/iavf.h\n> @@ -260,7 +260,6 @@ struct iavf_adapter {\n> \tstruct work_struct adminq_task;\n> \tstruct work_struct finish_config;\n> \twait_queue_head_t down_waitqueue;\n> -\twait_queue_head_t vc_waitqueue;\n> \tstruct iavf_q_vector *q_vectors;\n> \tstruct list_head vlan_filter_list;\n> \tint num_vlan_filters;\n> @@ -589,8 +588,9 @@ void iavf_configure_queues(struct iavf_adapter\n> *adapter); void iavf_enable_queues(struct iavf_adapter *adapter);\n> void iavf_disable_queues(struct iavf_adapter *adapter); void\n> iavf_map_queues(struct iavf_adapter *adapter); -void\n> iavf_add_ether_addrs(struct iavf_adapter *adapter);\n\n...\n\n> +/**\n> + * iavf_poll_virtchnl_response - Poll admin queue for virtchnl\n> response\n> + * @adapter: adapter structure\n> + * @condition: callback to check if desired response received\n> + * @cond_data: context data passed to condition callback\n> + * @timeout_ms: maximum time to wait in milliseconds\n> + *\n> + * Polls the admin queue and processes all incoming virtchnl\n> messages.\n> + * After processing each valid message, calls the condition callback\n> to\n> +check\n> + * if the expected response has been received. The callback receives\n> +the opcode\n> + * of the processed message to identify which response was received.\n> +Continues\n> + * polling until the callback returns true or timeout expires.\n> + * Caller must hold netdev_lock. This can sleep for up to timeout_ms\n> +while\n> + * polling hardware.\n> + *\n> + * Return: 0 on success (condition met), -EAGAIN on timeout, or error\n> +code */ int iavf_poll_virtchnl_response(struct iavf_adapter\n> *adapter,\n> +\t\t\t\tbool (*condition)(struct iavf_adapter\n> *adapter,\n> +\t\t\t\t\t\t const void *data,\n> +\t\t\t\t\t\t enum virtchnl_ops v_op),\n> +\t\t\t\tconst void *cond_data,\n> +\t\t\t\tunsigned int timeout_ms)\n> +{\n> +\tstruct iavf_hw *hw = &adapter->hw;\n> +\tstruct iavf_arq_event_info event;\n> +\tenum virtchnl_ops received_op;\n> +\tunsigned long timeout;\n> +\tint ret = -EAGAIN;\n> +\tu16 pending = 0;\n> +\tu32 v_retval;\n> +\n> +\tnetdev_assert_locked(adapter->netdev);\n> +\n> +\tevent.buf_len = IAVF_MAX_AQ_BUF_SIZE;\n> +\tevent.msg_buf = kzalloc(event.buf_len, GFP_KERNEL);\n> +\tif (!event.msg_buf)\n> +\t\treturn -ENOMEM;\n> +\n> +\ttimeout = jiffies + msecs_to_jiffies(timeout_ms);\n> +\tdo {\n> +\t\tif (!pending)\n> +\t\t\tusleep_range(50, 75);\n> +\n> +\t\tif (iavf_clean_arq_element(hw, &event, &pending) ==\n> IAVF_SUCCESS) {\n> +\t\t\treceived_op = (enum\n> virtchnl_ops)le32_to_cpu(event.desc.cookie_high);\n> +\t\t\tif (received_op != VIRTCHNL_OP_UNKNOWN) {\n> +\t\t\t\tv_retval =\n> le32_to_cpu(event.desc.cookie_low);\n> +\n> +\t\t\t\tiavf_virtchnl_completion(adapter,\n> received_op,\n> +\t\t\t\t\t\t\t (enum\n> iavf_status)v_retval,\n> +\t\t\t\t\t\t\t event.msg_buf,\n> event.msg_len);\n> +\n> +\t\t\t\tif (condition(adapter, cond_data,\n> received_op)) {\n> +\t\t\t\t\tret = 0;\n> +\t\t\t\t\tbreak;\n> +\t\t\t\t}\n> +\t\t\t}\n> +\n> +\t\t\tmemset(event.msg_buf, 0, IAVF_MAX_AQ_BUF_SIZE);\n> +\n> +\t\t\tif (pending)\n> +\t\t\t\tcontinue;\nI think continue at the end of the cycle is redundant.\n\nReviewed-by: Aleksandr Loktionov \n\n> +\t\t}\n> +\t} while (time_before(jiffies, timeout));\n> +\n> +\tkfree(event.msg_buf);\n> +\treturn ret;\n> +}\n> --\n> 2.53.0","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=CWIsl9Oh;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=140.211.166.136; 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without it, if timeout expires but there\nare still messages in the queue, we give up without processing them. The\nmessage we're waiting for might be in the queue and not a lot of messages\nstored are expected.\nThat continue reduces possible false timeouts (because the expected message\ncould be stored in the queue) while keeping the delay minimal.\nThe timeout is really just an estimate, and I don't think it needs\nto be very precise.\n\nThanks\n\nBest regards\nJose Ignacio","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=xDbiaBI4;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=140.211.166.137; helo=smtp4.osuosl.org;\n envelope-from=intel-wired-lan-bounces@osuosl.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5G9X5yxlz1yHZ\n\tfor ; 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However, in\n> the current flow, the actual virtchnl message is sent by the watchdog\n> task, which also needs to acquire the netdev lock to run. Additionally,\n> the adminq_task which processes virtchnl responses also needs the netdev\n> lock.\n> \n> This creates a deadlock scenario:\n> 1. iavf_set_mac() holds netdev lock and waits for MAC change\n> 2. Watchdog needs netdev lock to send the request -> blocked\n> 3. Even if request is sent, adminq_task needs netdev lock to process\n> PF response -> blocked\n> 4. MAC change times out after 2.5 seconds\n> 5. iavf_set_mac() returns -EAGAIN\n> \n> This particularly affects VFs during bonding setup when multiple VFs are\n> enslaved in quick succession.\n> \n> Fix by implementing a synchronous MAC change operation similar to the\n> approach used in commit fdadbf6e84c4 (\"iavf: fix incorrect reset handling\n> in callbacks\").\n> \n> The solution:\n> 1. Send the virtchnl ADD_ETH_ADDR message directly (not via watchdog)\n> 2. Poll the admin queue hardware directly for responses\n> 3. Process all received messages (including non-MAC messages)\n> 4. Return when MAC change completes or times out\n> \n> A new generic function iavf_poll_virtchnl_response() is introduced that\n> can be reused for any future synchronous virtchnl operations. It takes a\n> callback to check completion, allowing flexible condition checking.\n> \n> This allows the operation to complete synchronously while holding\n> netdev_lock, without relying on watchdog or adminq_task. The function\n> can sleep for up to 2.5 seconds polling hardware, but this is acceptable\n> since netdev_lock is per-device and only serializes operations on the\n> same interface.\n> \n> To support this, change iavf_add_ether_addrs() to return an error code\n> instead of void, allowing callers to detect failures. Additionally,\n> export iavf_mac_add_reject() to enable proper rollback on local failures\n> (timeouts, send errors) - PF rejections are already handled automatically\n> by iavf_virtchnl_completion().\n> \n> Remove vc_waitqueue entirely because iavf_set_mac was the only waiter on\n> this waitqueue and after the changes it is not needed.\n> \n> Fixes: ad7c7b2172c3 (\"net: hold netdev instance lock during sysfs operations\")\n> cc: stable@vger.kernel.org\n> Signed-off-by: Jose Ignacio Tornos Martinez \n\n\nthank you very much!\nReviewed-by: Przemek Kitszel ","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=i8X10rUG;\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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without it, if timeout expires but there\n> are still messages in the queue, we give up without processing them. The\n\nAlex is right,\n\"continue\" causes to check the condition clause of while loop, also for\ndo-while\n\n> message we're waiting for might be in the queue and not a lot of messages\n> stored are expected.\n> That continue reduces possible false timeouts (because the expected message\n> could be stored in the queue) while keeping the delay minimal.\n> The timeout is really just an estimate, and I don't think it needs\n> to be very precise.\n\nwith that said, current code is correct\n\nremoving the redundant \"if\" could be done while applying\n(if that will be the only nitpick left)\n\nafter more thinking:\nin theory, not checking the time but processing next message if there\nwere any pending on the previous message could cause infinite loop\n(to fix that we should stop refreshing \"pending\" value after the\ntimeout, but only decrementing it - but I think that this would be\nneedless complication)\n\nMy Reviewed-by still holds\n\n> \n> Thanks\n> \n> Best regards\n> Jose Ignacio\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=ILOBxWHl;\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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