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authorFurong Xu <0x1207@gmail.com>2024-10-21 14:10:23 +0800
committerPaolo Abeni <pabeni@redhat.com>2024-10-29 11:37:10 +0100
commit66600fac7a984dea4ae095411f644770b2561ede (patch)
tree407f8e8533a0f7320cbf220159fe8e80a5a2e639
parentf84ef58e553206b02d06e02158c98fbccba25d19 (diff)
net: stmmac: TSO: Fix unbalanced DMA map/unmap for non-paged SKB data
In case the non-paged data of a SKB carries protocol header and protocol payload to be transmitted on a certain platform that the DMA AXI address width is configured to 40-bit/48-bit, or the size of the non-paged data is bigger than TSO_MAX_BUFF_SIZE on a certain platform that the DMA AXI address width is configured to 32-bit, then this SKB requires at least two DMA transmit descriptors to serve it. For example, three descriptors are allocated to split one DMA buffer mapped from one piece of non-paged data: dma_desc[N + 0], dma_desc[N + 1], dma_desc[N + 2]. Then three elements of tx_q->tx_skbuff_dma[] will be allocated to hold extra information to be reused in stmmac_tx_clean(): tx_q->tx_skbuff_dma[N + 0], tx_q->tx_skbuff_dma[N + 1], tx_q->tx_skbuff_dma[N + 2]. Now we focus on tx_q->tx_skbuff_dma[entry].buf, which is the DMA buffer address returned by DMA mapping call. stmmac_tx_clean() will try to unmap the DMA buffer _ONLY_IF_ tx_q->tx_skbuff_dma[entry].buf is a valid buffer address. The expected behavior that saves DMA buffer address of this non-paged data to tx_q->tx_skbuff_dma[entry].buf is: tx_q->tx_skbuff_dma[N + 0].buf = NULL; tx_q->tx_skbuff_dma[N + 1].buf = NULL; tx_q->tx_skbuff_dma[N + 2].buf = dma_map_single(); Unfortunately, the current code misbehaves like this: tx_q->tx_skbuff_dma[N + 0].buf = dma_map_single(); tx_q->tx_skbuff_dma[N + 1].buf = NULL; tx_q->tx_skbuff_dma[N + 2].buf = NULL; On the stmmac_tx_clean() side, when dma_desc[N + 0] is closed by the DMA engine, tx_q->tx_skbuff_dma[N + 0].buf is a valid buffer address obviously, then the DMA buffer will be unmapped immediately. There may be a rare case that the DMA engine does not finish the pending dma_desc[N + 1], dma_desc[N + 2] yet. Now things will go horribly wrong, DMA is going to access a unmapped/unreferenced memory region, corrupted data will be transmited or iommu fault will be triggered :( In contrast, the for-loop that maps SKB fragments behaves perfectly as expected, and that is how the driver should do for both non-paged data and paged frags actually. This patch corrects DMA map/unmap sequences by fixing the array index for tx_q->tx_skbuff_dma[entry].buf when assigning DMA buffer address. Tested and verified on DWXGMAC CORE 3.20a Reported-by: Suraj Jaiswal <quic_jsuraj@quicinc.com> Fixes: f748be531d70 ("stmmac: support new GMAC4") Signed-off-by: Furong Xu <0x1207@gmail.com> Reviewed-by: Hariprasad Kelam <hkelam@marvell.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20241021061023.2162701-1-0x1207@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
-rw-r--r--drivers/net/ethernet/stmicro/stmmac/stmmac_main.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index d3895d7eecfc..208dbc68aaf9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4304,11 +4304,6 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
if (dma_mapping_error(priv->device, des))
goto dma_map_err;
- tx_q->tx_skbuff_dma[first_entry].buf = des;
- tx_q->tx_skbuff_dma[first_entry].len = skb_headlen(skb);
- tx_q->tx_skbuff_dma[first_entry].map_as_page = false;
- tx_q->tx_skbuff_dma[first_entry].buf_type = STMMAC_TXBUF_T_SKB;
-
if (priv->dma_cap.addr64 <= 32) {
first->des0 = cpu_to_le32(des);
@@ -4327,6 +4322,23 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
stmmac_tso_allocator(priv, des, tmp_pay_len, (nfrags == 0), queue);
+ /* In case two or more DMA transmit descriptors are allocated for this
+ * non-paged SKB data, the DMA buffer address should be saved to
+ * tx_q->tx_skbuff_dma[].buf corresponding to the last descriptor,
+ * and leave the other tx_q->tx_skbuff_dma[].buf as NULL to guarantee
+ * that stmmac_tx_clean() does not unmap the entire DMA buffer too early
+ * since the tail areas of the DMA buffer can be accessed by DMA engine
+ * sooner or later.
+ * By saving the DMA buffer address to tx_q->tx_skbuff_dma[].buf
+ * corresponding to the last descriptor, stmmac_tx_clean() will unmap
+ * this DMA buffer right after the DMA engine completely finishes the
+ * full buffer transmission.
+ */
+ tx_q->tx_skbuff_dma[tx_q->cur_tx].buf = des;
+ tx_q->tx_skbuff_dma[tx_q->cur_tx].len = skb_headlen(skb);
+ tx_q->tx_skbuff_dma[tx_q->cur_tx].map_as_page = false;
+ tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type = STMMAC_TXBUF_T_SKB;
+
/* Prepare fragments */
for (i = 0; i < nfrags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];