[{"id":3682740,"web_url":"http://patchwork.ozlabs.org/comment/3682740/","msgid":"","list_archive_url":null,"date":"2026-04-27T14:20:42","subject":"Re: [Intel-wired-lan] [PATCH iwl-next v2] e1000e: Avoid DMA\n re-mapping on RX copybreak","submitter":{"id":70275,"url":"http://patchwork.ozlabs.org/api/people/70275/","name":"Paul Menzel","email":"pmenzel@molgen.mpg.de"},"content":"Dear Matt,\n\n\nThank you for your patch.\n\nAm 27.04.26 um 16:12 schrieb Matt Vollrath:\n> This patch factors out DMA re-mapping for skbs which were recycled in\n> the RX path due to copybreak or errors. There is only one path out of\n> the e1000_clean_rx_irq() loop where the skb is consumed and DMA needs\n> to be re-mapped, so don't unmap it before checking the conditions.\n> \n> The buffer allocation loop is adjusted to not assume that DMA is\n> unmapped, handling mapping errors gracefully.\n> \n> On systems with IOMMU enabled, the cost of re-mapping DMA is greater\n> than the cost of copying data out of the ring buffer. When I use this\n> patch and configure e1000e with copybreak=2048, my system with IOMMU\n> completes RX twice as fast under load.\n\nIt’d be great if you could document the benchmark, and described your \nsystem and shared the numbers.\n\n> The kludge of unconditional unmapping has existed since this driver was\n> introduced in 2007, inherited from the e1000 driver which has since\n> factored it out. IOMMU tech was new at the time.\n\nPlease share the commit factoring it out.\n\nAlso, what about systems where the IOMMU is disabled. (I think that is \npossible.)\n\n> Tested on an I218-V.\n> \n> Assisted-by: Claude:claude-4-7-opus\n> Signed-off-by: Matt Vollrath \n> Signed-off-by: Aleksandr Loktionov \n> ---\n> v2:\n> * proofread description with Aleksandr\n> ---\n> drivers/net/ethernet/intel/e1000e/netdev.c | 34 +++++++++++++++-------\n> 1 file changed, 23 insertions(+), 11 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c\n> index 9befdacd6730..b1d6119171df 100644\n> --- a/drivers/net/ethernet/intel/e1000e/netdev.c\n> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c\n> @@ -663,6 +663,8 @@ static void e1000_alloc_rx_buffers(struct e1000_ring *rx_ring,\n> \t\tskb = buffer_info->skb;\n> \t\tif (skb) {\n> \t\t\tskb_trim(skb, 0);\n> +\t\t\tif (likely(buffer_info->dma))\n> +\t\t\t\tgoto write_desc;\n> \t\t\tgoto map_skb;\n> \t\t}\n> \n> @@ -680,10 +682,12 @@ static void e1000_alloc_rx_buffers(struct e1000_ring *rx_ring,\n> \t\t\t\t\t\t DMA_FROM_DEVICE);\n> \t\tif (dma_mapping_error(&pdev->dev, buffer_info->dma)) {\n> \t\t\tdev_err(&pdev->dev, \"Rx DMA map failed\\n\");\n> +\t\t\tbuffer_info->dma = 0;\n> \t\t\tadapter->rx_dma_failed++;\n> \t\t\tbreak;\n> \t\t}\n> \n> +write_desc:\n> \t\trx_desc = E1000_RX_DESC_EXT(*rx_ring, i);\n> \t\trx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);\n> \n> @@ -941,7 +945,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n> \t\tdma_rmb();\t/* read descriptor and rx_buffer_info after status DD */\n> \n> \t\tskb = buffer_info->skb;\n> -\t\tbuffer_info->skb = NULL;\n> \n> \t\tprefetch(skb->data - NET_IP_ALIGN);\n> \n> @@ -955,9 +958,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n> \n> \t\tcleaned = true;\n> \t\tcleaned_count++;\n> -\t\tdma_unmap_single(&pdev->dev, buffer_info->dma,\n> -\t\t\t\t adapter->rx_buffer_len, DMA_FROM_DEVICE);\n> -\t\tbuffer_info->dma = 0;\n> \n> \t\tlength = le16_to_cpu(rx_desc->wb.upper.length);\n> \n> @@ -973,8 +973,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n> \t\tif (adapter->flags2 & FLAG2_IS_DISCARDING) {\n> \t\t\t/* All receives must fit into a single buffer */\n> \t\t\te_dbg(\"Receive packet consumed multiple buffers\\n\");\n> -\t\t\t/* recycle */\n> -\t\t\tbuffer_info->skb = skb;\n> \t\t\tif (staterr & E1000_RXD_STAT_EOP)\n> \t\t\t\tadapter->flags2 &= ~FLAG2_IS_DISCARDING;\n> \t\t\tgoto next_desc;\n> @@ -982,8 +980,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n> \n> \t\tif (unlikely((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) &&\n> \t\t\t !(netdev->features & NETIF_F_RXALL))) {\n> -\t\t\t/* recycle */\n> -\t\t\tbuffer_info->skb = skb;\n> \t\t\tgoto next_desc;\n> \t\t}\n> \n> @@ -1010,19 +1006,35 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n> \t\t\tstruct sk_buff *new_skb =\n> \t\t\t\tnapi_alloc_skb(&adapter->napi, length);\n> \t\t\tif (new_skb) {\n> +\t\t\t\tdma_sync_single_for_cpu(&pdev->dev,\n> +\t\t\t\t\t\t\tbuffer_info->dma,\n> +\t\t\t\t\t\t\tadapter->rx_buffer_len,\n> +\t\t\t\t\t\t\tDMA_FROM_DEVICE);\n> \t\t\t\tskb_copy_to_linear_data_offset(new_skb,\n> \t\t\t\t\t\t\t -NET_IP_ALIGN,\n> \t\t\t\t\t\t\t (skb->data -\n> \t\t\t\t\t\t\t\tNET_IP_ALIGN),\n> \t\t\t\t\t\t\t (length +\n> \t\t\t\t\t\t\t\tNET_IP_ALIGN));\n> -\t\t\t\t/* save the skb in buffer_info as good */\n> -\t\t\t\tbuffer_info->skb = skb;\n> +\t\t\t\tdma_sync_single_for_device(&pdev->dev,\n> +\t\t\t\t\t\t\t buffer_info->dma,\n> +\t\t\t\t\t\t\t adapter->rx_buffer_len,\n> +\t\t\t\t\t\t\t DMA_FROM_DEVICE);\n> \t\t\t\tskb = new_skb;\n> \t\t\t}\n> \t\t\t/* else just continue with the old one */\n> \t\t}\n> -\t\t/* end copybreak code */\n> +\n> +\t\t/* If skb was not replaced by copybreak, we are consuming\n> +\t\t * the original buffer and must release the DMA mapping.\n> +\t\t */\n> +\t\tif (skb == buffer_info->skb) {\n> +\t\t\tbuffer_info->skb = NULL;\n> +\t\t\tdma_unmap_single(&pdev->dev, buffer_info->dma,\n> +\t\t\t\t\t adapter->rx_buffer_len,\n> +\t\t\t\t\t DMA_FROM_DEVICE);\n> +\t\t\tbuffer_info->dma = 0;\n> +\t\t}\n> \t\tskb_put(skb, length);\n> \n> \t\t/* Receive Checksum Offload */\n\n\nKind regards,\n\nPaul","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=b9Bz0J6X;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=140.211.166.138; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-Mailman-Original-Authentication-Results":"smtp4.osuosl.org;\n dmarc=none (p=none dis=none)\n header.from=molgen.mpg.de","Subject":"Re: [Intel-wired-lan] [PATCH iwl-next v2] e1000e: Avoid DMA\n re-mapping on RX copybreak","X-BeenThere":"intel-wired-lan@osuosl.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Intel Wired Ethernet Linux Kernel Driver Development\n ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"intel-wired-lan-bounces@osuosl.org","Sender":"\"Intel-wired-lan\" "}},{"id":3682766,"web_url":"http://patchwork.ozlabs.org/comment/3682766/","msgid":"","list_archive_url":null,"date":"2026-04-27T15:03:15","subject":"Re: [Intel-wired-lan] [PATCH iwl-next v2] e1000e: Avoid DMA\n re-mapping on RX copybreak","submitter":{"id":92679,"url":"http://patchwork.ozlabs.org/api/people/92679/","name":"Matt Vollrath","email":"tactii@gmail.com"},"content":"On 4/27/26 10:20, Paul Menzel wrote:\n> Dear Matt,\n> \n> \n> Thank you for your patch.\n> \n> Am 27.04.26 um 16:12 schrieb Matt Vollrath:\n>> This patch factors out DMA re-mapping for skbs which were recycled in\n>> the RX path due to copybreak or errors. There is only one path out of\n>> the e1000_clean_rx_irq() loop where the skb is consumed and DMA needs\n>> to be re-mapped, so don't unmap it before checking the conditions.\n>>\n>> The buffer allocation loop is adjusted to not assume that DMA is\n>> unmapped, handling mapping errors gracefully.\n>>\n>> On systems with IOMMU enabled, the cost of re-mapping DMA is greater\n>> than the cost of copying data out of the ring buffer. When I use this\n>> patch and configure e1000e with copybreak=2048, my system with IOMMU\n>> completes RX twice as fast under load.\n> \n> It’d be great if you could document the benchmark, and described your system and shared the numbers.\n> \n>> The kludge of unconditional unmapping has existed since this driver was\n>> introduced in 2007, inherited from the e1000 driver which has since\n>> factored it out. IOMMU tech was new at the time.\n> \n> Please share the commit factoring it out.\n> \n> Also, what about systems where the IOMMU is disabled. (I think that is possible.)\n\nThanks Paul, I'll put in some benchmark details and cite the history.\n\nAt a glance, the performance impact on IOMMU-disabled or passthrough\nwas marginal.\n\nI'll also wait until tomorrow morning to post v3, jumped the gun this\nmorning. No more revisions before breakfast!\n\n> \n>> Tested on an I218-V.\n>>\n>> Assisted-by: Claude:claude-4-7-opus\n>> Signed-off-by: Matt Vollrath \n>> Signed-off-by: Aleksandr Loktionov \n>> ---\n>> v2:\n>> * proofread description with Aleksandr\n>> ---\n>>   drivers/net/ethernet/intel/e1000e/netdev.c | 34 +++++++++++++++-------\n>>   1 file changed, 23 insertions(+), 11 deletions(-)\n>>\n>> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c\n>> index 9befdacd6730..b1d6119171df 100644\n>> --- a/drivers/net/ethernet/intel/e1000e/netdev.c\n>> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c\n>> @@ -663,6 +663,8 @@ static void e1000_alloc_rx_buffers(struct e1000_ring *rx_ring,\n>>           skb = buffer_info->skb;\n>>           if (skb) {\n>>               skb_trim(skb, 0);\n>> +            if (likely(buffer_info->dma))\n>> +                goto write_desc;\n>>               goto map_skb;\n>>           }\n>> @@ -680,10 +682,12 @@ static void e1000_alloc_rx_buffers(struct e1000_ring *rx_ring,\n>>                             DMA_FROM_DEVICE);\n>>           if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {\n>>               dev_err(&pdev->dev, \"Rx DMA map failed\\n\");\n>> +            buffer_info->dma = 0;\n>>               adapter->rx_dma_failed++;\n>>               break;\n>>           }\n>> +write_desc:\n>>           rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);\n>>           rx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);\n>> @@ -941,7 +945,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n>>           dma_rmb();    /* read descriptor and rx_buffer_info after status DD */\n>>           skb = buffer_info->skb;\n>> -        buffer_info->skb = NULL;\n>>           prefetch(skb->data - NET_IP_ALIGN);\n>> @@ -955,9 +958,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n>>           cleaned = true;\n>>           cleaned_count++;\n>> -        dma_unmap_single(&pdev->dev, buffer_info->dma,\n>> -                 adapter->rx_buffer_len, DMA_FROM_DEVICE);\n>> -        buffer_info->dma = 0;\n>>           length = le16_to_cpu(rx_desc->wb.upper.length);\n>> @@ -973,8 +973,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n>>           if (adapter->flags2 & FLAG2_IS_DISCARDING) {\n>>               /* All receives must fit into a single buffer */\n>>               e_dbg(\"Receive packet consumed multiple buffers\\n\");\n>> -            /* recycle */\n>> -            buffer_info->skb = skb;\n>>               if (staterr & E1000_RXD_STAT_EOP)\n>>                   adapter->flags2 &= ~FLAG2_IS_DISCARDING;\n>>               goto next_desc;\n>> @@ -982,8 +980,6 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n>>           if (unlikely((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) &&\n>>                    !(netdev->features & NETIF_F_RXALL))) {\n>> -            /* recycle */\n>> -            buffer_info->skb = skb;\n>>               goto next_desc;\n>>           }\n>> @@ -1010,19 +1006,35 @@ static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,\n>>               struct sk_buff *new_skb =\n>>                   napi_alloc_skb(&adapter->napi, length);\n>>               if (new_skb) {\n>> +                dma_sync_single_for_cpu(&pdev->dev,\n>> +                            buffer_info->dma,\n>> +                            adapter->rx_buffer_len,\n>> +                            DMA_FROM_DEVICE);\n>>                   skb_copy_to_linear_data_offset(new_skb,\n>>                                      -NET_IP_ALIGN,\n>>                                      (skb->data -\n>>                                   NET_IP_ALIGN),\n>>                                      (length +\n>>                                   NET_IP_ALIGN));\n>> -                /* save the skb in buffer_info as good */\n>> -                buffer_info->skb = skb;\n>> +                dma_sync_single_for_device(&pdev->dev,\n>> +                               buffer_info->dma,\n>> +                               adapter->rx_buffer_len,\n>> +                               DMA_FROM_DEVICE);\n>>                   skb = new_skb;\n>>               }\n>>               /* else just continue with the old one */\n>>           }\n>> -        /* end copybreak code */\n>> +\n>> +        /* If skb was not replaced by copybreak, we are consuming\n>> +         * the original buffer and must release the DMA mapping.\n>> +         */\n>> +        if (skb == buffer_info->skb) {\n>> +            buffer_info->skb = NULL;\n>> +            dma_unmap_single(&pdev->dev, buffer_info->dma,\n>> +                     adapter->rx_buffer_len,\n>> +                     DMA_FROM_DEVICE);\n>> +            buffer_info->dma = 0;\n>> +        }\n>>           skb_put(skb, length);\n>>           /* Receive Checksum Offload */\n> \n> \n> Kind regards,\n> \n> Paul","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=PBiKpLLP;\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 4g46Jh1221z1yHX\n\tfor ; Tue, 28 Apr 2026 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header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=rthxpkjG"],"Subject":"Re: [Intel-wired-lan] [PATCH iwl-next v2] e1000e: Avoid DMA\n re-mapping on RX copybreak","X-BeenThere":"intel-wired-lan@osuosl.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Intel Wired Ethernet Linux Kernel Driver Development\n ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"intel-wired-lan-bounces@osuosl.org","Sender":"\"Intel-wired-lan\" "}}]