From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 436BAC169C3 for ; Wed, 27 Jan 2021 01:51:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D32C2068D for ; Wed, 27 Jan 2021 01:51:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725923AbhA0BtD (ORCPT ); Tue, 26 Jan 2021 20:49:03 -0500 Received: from ex13-edg-ou-002.vmware.com ([208.91.0.190]:21048 "EHLO EX13-EDG-OU-002.vmware.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2395039AbhAZTHj (ORCPT ); Tue, 26 Jan 2021 14:07:39 -0500 Received: from sc9-mailhost2.vmware.com (10.113.161.72) by EX13-EDG-OU-002.vmware.com (10.113.208.156) with Microsoft SMTP Server id 15.0.1156.6; Tue, 26 Jan 2021 11:06:39 -0800 Received: from htb-1n-eng-dhcp122.eng.vmware.com (unknown [10.20.114.3]) by sc9-mailhost2.vmware.com (Postfix) with ESMTP id 3B34C203FB; Tue, 26 Jan 2021 11:06:42 -0800 (PST) Received: by htb-1n-eng-dhcp122.eng.vmware.com (Postfix, from userid 0) id 3425EA9FB7; Tue, 26 Jan 2021 11:06:42 -0800 (PST) From: Ronak Doshi To: CC: Ronak Doshi , Petr Vandrovec , "maintainer:VMWARE VMXNET3 ETHERNET DRIVER" , "David S. Miller" , Jakub Kicinski , open list Subject: [PATCH v4 net-next] vmxnet3: Remove buf_info from device accessible structures Date: Tue, 26 Jan 2021 11:06:40 -0800 Message-ID: <20210126190640.26942-1-doshir@vmware.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Content-Type: text/plain Received-SPF: None (EX13-EDG-OU-002.vmware.com: doshir@vmware.com does not designate permitted sender hosts) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org buf_info structures in RX & TX queues are private driver data that do not need to be visible to the device. Although there is physical address and length in the queue descriptor that points to these structures, their layout is not standardized, and device never looks at them. So lets allocate these structures in non-DMA-able memory, and fill physical address as all-ones and length as zero in the queue descriptor. That should alleviate worries brought by Martin Radev in https://lists.osuosl.org/pipermail/intel-wired-lan/Week-of-Mon-20210104/022829.html that malicious vmxnet3 device could subvert SVM/TDX guarantees. Signed-off-by: Petr Vandrovec Signed-off-by: Ronak Doshi --- Changes in v2: - Use kcalloc_node() - Remove log for memory allocation failure Changes in v3: - Do not pass __GFP_ZERO to kcalloc Changes in v4: - Modified description to not have subject line --- drivers/net/vmxnet3/vmxnet3_drv.c | 37 ++++++++++++------------------------- drivers/net/vmxnet3/vmxnet3_int.h | 2 -- 2 files changed, 12 insertions(+), 27 deletions(-) diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c index 336504b7531d..419e81b21d9b 100644 --- a/drivers/net/vmxnet3/vmxnet3_drv.c +++ b/drivers/net/vmxnet3/vmxnet3_drv.c @@ -452,9 +452,7 @@ vmxnet3_tq_destroy(struct vmxnet3_tx_queue *tq, tq->comp_ring.base = NULL; } if (tq->buf_info) { - dma_free_coherent(&adapter->pdev->dev, - tq->tx_ring.size * sizeof(tq->buf_info[0]), - tq->buf_info, tq->buf_info_pa); + kfree(tq->buf_info); tq->buf_info = NULL; } } @@ -505,8 +503,6 @@ static int vmxnet3_tq_create(struct vmxnet3_tx_queue *tq, struct vmxnet3_adapter *adapter) { - size_t sz; - BUG_ON(tq->tx_ring.base || tq->data_ring.base || tq->comp_ring.base || tq->buf_info); @@ -534,9 +530,9 @@ vmxnet3_tq_create(struct vmxnet3_tx_queue *tq, goto err; } - sz = tq->tx_ring.size * sizeof(tq->buf_info[0]); - tq->buf_info = dma_alloc_coherent(&adapter->pdev->dev, sz, - &tq->buf_info_pa, GFP_KERNEL); + tq->buf_info = kcalloc_node(tq->tx_ring.size, sizeof(tq->buf_info[0]), + GFP_KERNEL, + dev_to_node(&adapter->pdev->dev)); if (!tq->buf_info) goto err; @@ -1738,10 +1734,7 @@ static void vmxnet3_rq_destroy(struct vmxnet3_rx_queue *rq, } if (rq->buf_info[0]) { - size_t sz = sizeof(struct vmxnet3_rx_buf_info) * - (rq->rx_ring[0].size + rq->rx_ring[1].size); - dma_free_coherent(&adapter->pdev->dev, sz, rq->buf_info[0], - rq->buf_info_pa); + kfree(rq->buf_info[0]); rq->buf_info[0] = rq->buf_info[1] = NULL; } } @@ -1883,10 +1876,9 @@ vmxnet3_rq_create(struct vmxnet3_rx_queue *rq, struct vmxnet3_adapter *adapter) goto err; } - sz = sizeof(struct vmxnet3_rx_buf_info) * (rq->rx_ring[0].size + - rq->rx_ring[1].size); - bi = dma_alloc_coherent(&adapter->pdev->dev, sz, &rq->buf_info_pa, - GFP_KERNEL); + bi = kcalloc_node(rq->rx_ring[0].size + rq->rx_ring[1].size, + sizeof(rq->buf_info[0][0]), GFP_KERNEL, + dev_to_node(&adapter->pdev->dev)); if (!bi) goto err; @@ -2522,14 +2514,12 @@ vmxnet3_setup_driver_shared(struct vmxnet3_adapter *adapter) tqc->txRingBasePA = cpu_to_le64(tq->tx_ring.basePA); tqc->dataRingBasePA = cpu_to_le64(tq->data_ring.basePA); tqc->compRingBasePA = cpu_to_le64(tq->comp_ring.basePA); - tqc->ddPA = cpu_to_le64(tq->buf_info_pa); + tqc->ddPA = cpu_to_le64(~0ULL); tqc->txRingSize = cpu_to_le32(tq->tx_ring.size); tqc->dataRingSize = cpu_to_le32(tq->data_ring.size); tqc->txDataRingDescSize = cpu_to_le32(tq->txdata_desc_size); tqc->compRingSize = cpu_to_le32(tq->comp_ring.size); - tqc->ddLen = cpu_to_le32( - sizeof(struct vmxnet3_tx_buf_info) * - tqc->txRingSize); + tqc->ddLen = cpu_to_le32(0); tqc->intrIdx = tq->comp_ring.intr_idx; } @@ -2541,14 +2531,11 @@ vmxnet3_setup_driver_shared(struct vmxnet3_adapter *adapter) rqc->rxRingBasePA[0] = cpu_to_le64(rq->rx_ring[0].basePA); rqc->rxRingBasePA[1] = cpu_to_le64(rq->rx_ring[1].basePA); rqc->compRingBasePA = cpu_to_le64(rq->comp_ring.basePA); - rqc->ddPA = cpu_to_le64(rq->buf_info_pa); + rqc->ddPA = cpu_to_le64(~0ULL); rqc->rxRingSize[0] = cpu_to_le32(rq->rx_ring[0].size); rqc->rxRingSize[1] = cpu_to_le32(rq->rx_ring[1].size); rqc->compRingSize = cpu_to_le32(rq->comp_ring.size); - rqc->ddLen = cpu_to_le32( - sizeof(struct vmxnet3_rx_buf_info) * - (rqc->rxRingSize[0] + - rqc->rxRingSize[1])); + rqc->ddLen = cpu_to_le32(0); rqc->intrIdx = rq->comp_ring.intr_idx; if (VMXNET3_VERSION_GE_3(adapter)) { rqc->rxDataRingBasePA = diff --git a/drivers/net/vmxnet3/vmxnet3_int.h b/drivers/net/vmxnet3/vmxnet3_int.h index d958b92c9429..e910596b79cf 100644 --- a/drivers/net/vmxnet3/vmxnet3_int.h +++ b/drivers/net/vmxnet3/vmxnet3_int.h @@ -240,7 +240,6 @@ struct vmxnet3_tx_queue { spinlock_t tx_lock; struct vmxnet3_cmd_ring tx_ring; struct vmxnet3_tx_buf_info *buf_info; - dma_addr_t buf_info_pa; struct vmxnet3_tx_data_ring data_ring; struct vmxnet3_comp_ring comp_ring; struct Vmxnet3_TxQueueCtrl *shared; @@ -298,7 +297,6 @@ struct vmxnet3_rx_queue { u32 qid2; /* rqID in RCD for buffer from 2nd ring */ u32 dataRingQid; /* rqID in RCD for buffer from data ring */ struct vmxnet3_rx_buf_info *buf_info[2]; - dma_addr_t buf_info_pa; struct Vmxnet3_RxQueueCtrl *shared; struct vmxnet3_rq_driver_stats stats; } __attribute__((__aligned__(SMP_CACHE_BYTES))); -- 2.11.0