From: Firo Yang <firo.yang@suse.com>
To: "davem@davemloft.net" <davem@davemloft.net>
Cc: "alexander.h.duyck@linux.intel.com"
<alexander.h.duyck@linux.intel.com>,
"jeffrey.t.kirsher@intel.com" <jeffrey.t.kirsher@intel.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"intel-wired-lan@lists.osuosl.org"
<intel-wired-lan@lists.osuosl.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Firo Yang <firo.yang@suse.com>
Subject: [PATCH v2 1/1] ixgbe: sync the first fragment unconditionally
Date: Wed, 7 Aug 2019 02:49:45 +0000 [thread overview]
Message-ID: <20190807024917.27682-1-firo.yang@suse.com> (raw)
In Xen environment, if Xen-swiotlb is enabled, ixgbe driver
could possibly allocate a page, DMA memory buffer, for the first
fragment which is not suitable for Xen-swiotlb to do DMA operations.
Xen-swiotlb have to internally allocate another page for doing DMA
operations. It requires syncing between those two pages. However,
since commit f3213d932173 ("ixgbe: Update driver to make use of DMA
attributes in Rx path"), the unmap operation is performed with
DMA_ATTR_SKIP_CPU_SYNC. As a result, the sync is not performed.
To fix this problem, always sync before possibly performing a page
unmap operation.
Fixes: f3213d932173 ("ixgbe: Update driver to make use of DMA
attributes in Rx path")
Reviewed-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Firo Yang <firo.yang@suse.com>
---
Changes from v1:
* Imporved the patch description.
* Added Reviewed-by: and Fixes: as suggested by Alexander Duyck
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index cbaf712d6529..200de9838096 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1825,13 +1825,7 @@ static void ixgbe_pull_tail(struct ixgbe_ring *rx_ring,
static void ixgbe_dma_sync_frag(struct ixgbe_ring *rx_ring,
struct sk_buff *skb)
{
- /* if the page was released unmap it, else just sync our portion */
- if (unlikely(IXGBE_CB(skb)->page_released)) {
- dma_unmap_page_attrs(rx_ring->dev, IXGBE_CB(skb)->dma,
- ixgbe_rx_pg_size(rx_ring),
- DMA_FROM_DEVICE,
- IXGBE_RX_DMA_ATTR);
- } else if (ring_uses_build_skb(rx_ring)) {
+ if (ring_uses_build_skb(rx_ring)) {
unsigned long offset = (unsigned long)(skb->data) & ~PAGE_MASK;
dma_sync_single_range_for_cpu(rx_ring->dev,
@@ -1848,6 +1842,14 @@ static void ixgbe_dma_sync_frag(struct ixgbe_ring *rx_ring,
skb_frag_size(frag),
DMA_FROM_DEVICE);
}
+
+ /* If the page was released, just unmap it. */
+ if (unlikely(IXGBE_CB(skb)->page_released)) {
+ dma_unmap_page_attrs(rx_ring->dev, IXGBE_CB(skb)->dma,
+ ixgbe_rx_pg_size(rx_ring),
+ DMA_FROM_DEVICE,
+ IXGBE_RX_DMA_ATTR);
+ }
}
/**
--
2.16.4
next reply other threads:[~2019-08-07 2:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-07 2:49 Firo Yang [this message]
2019-08-07 7:56 ` [PATCH v2 1/1] ixgbe: sync the first fragment unconditionally Jacob Wen
2019-08-07 8:38 ` Firo Yang
[not found] ` <20190807160853.00001d71@gmail.com>
2019-08-07 16:06 ` [Intel-wired-lan] " Alexander Duyck
2019-08-08 1:55 ` Firo Yang
2019-08-08 1:56 ` Jacob Wen
2019-08-08 3:48 ` Alexander Duyck
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