diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0024-sdk_dpaa-ls1043a-errata-verify-and-resize-headroom-a.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0024-sdk_dpaa-ls1043a-errata-verify-and-resize-headroom-a.patch | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0024-sdk_dpaa-ls1043a-errata-verify-and-resize-headroom-a.patch b/target/linux/layerscape/patches-5.4/701-net-0024-sdk_dpaa-ls1043a-errata-verify-and-resize-headroom-a.patch new file mode 100644 index 0000000000..6014de951f --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0024-sdk_dpaa-ls1043a-errata-verify-and-resize-headroom-a.patch @@ -0,0 +1,106 @@ +From f6413a7e32d1f98a258e0ed9abd4df3159902fd3 Mon Sep 17 00:00:00 2001 +From: Camelia Groza <camelia.groza@nxp.com> +Date: Mon, 4 Sep 2017 13:57:21 +0300 +Subject: [PATCH] sdk_dpaa: ls1043a errata: verify and resize headroom + alignment + +If the skb's headroom isn't aligned to 16 bytes, reallocate the entire +skb and resize its headroom to priv->tx_headroom. Update the pointers +to the network and transport headers accordingly. + +Signed-off-by: Camelia Groza <camelia.groza@nxp.com> +--- + .../net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c | 38 +++++++++++++++------- + 1 file changed, 27 insertions(+), 11 deletions(-) + +--- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c ++++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c +@@ -742,14 +742,19 @@ int __hot skb_to_contig_fd(struct dpa_pr + EXPORT_SYMBOL(skb_to_contig_fd); + + #ifndef CONFIG_PPC +-/* Verify the conditions that trigger the A010022 errata: 4K memory address +- * crossings. ++/* Verify the conditions that trigger the A010022 errata: data unaligned to ++ * 16 bytes and 4K memory address crossings. + */ +-bool a010022_check_skb(struct sk_buff *skb) ++static bool a010022_check_skb(struct sk_buff *skb, struct dpa_priv_s *priv) + { + int nr_frags, i = 0; + skb_frag_t *frag; + ++ /* Check if the headroom is aligned */ ++ if (((u16)skb->data - priv->tx_headroom) % ++ priv->buf_layout[TX].data_align != 0) ++ return true; ++ + /* Check if the headroom crosses a boundary */ + if (HAS_DMA_ISSUE(skb->head, skb_headroom(skb))) + return true; +@@ -767,7 +772,7 @@ bool a010022_check_skb(struct sk_buff *s + while (i < nr_frags) { + frag = &skb_shinfo(skb)->frags[i]; + +- /* Check if the paged fragment crosses a boundary from its ++ /* Check if a paged fragment crosses a boundary from its + * offset to its end. + */ + if (HAS_DMA_ISSUE(frag->page_offset, frag->size)) +@@ -783,13 +788,17 @@ bool a010022_check_skb(struct sk_buff *s + * page. Build a new skb around the new buffer and release the old one. + * A performance drop should be expected. + */ +-struct sk_buff *a010022_realign_skb(struct sk_buff *skb) ++static struct sk_buff *a010022_realign_skb(struct sk_buff *skb, ++ struct dpa_priv_s *priv) + { +- int headroom = skb_headroom(skb); ++ int trans_offset = skb_transport_offset(skb); ++ int net_offset = skb_network_offset(skb); + struct sk_buff *nskb = NULL; ++ int nsize, headroom; + struct page *npage; + void *npage_addr; +- int nsize; ++ ++ headroom = priv->tx_headroom; + + npage = alloc_page(GFP_ATOMIC); + if (unlikely(!npage)) { +@@ -822,6 +831,13 @@ struct sk_buff *a010022_realign_skb(stru + } + copy_skb_header(nskb, skb); + ++ /* We move the headroom when we align it so we have to reset the ++ * network and transport header offsets relative to the new data ++ * pointer. The checksum offload relies on these offsets. ++ */ ++ skb_set_network_header(nskb, net_offset); ++ skb_set_transport_header(nskb, trans_offset); ++ + dev_kfree_skb(skb); + return nskb; + +@@ -1024,8 +1040,8 @@ int __hot dpa_tx_extended(struct sk_buff + #endif /* CONFIG_FSL_DPAA_TS */ + + #ifndef CONFIG_PPC +- if (unlikely(dpaa_errata_a010022) && a010022_check_skb(skb)) { +- skb = a010022_realign_skb(skb); ++ if (unlikely(dpaa_errata_a010022) && a010022_check_skb(skb, priv)) { ++ skb = a010022_realign_skb(skb, priv); + if (!skb) + goto skb_to_fd_failed; + } +@@ -1072,8 +1088,8 @@ int __hot dpa_tx_extended(struct sk_buff + skb = nskb; + #ifndef CONFIG_PPC + if (unlikely(dpaa_errata_a010022) && +- a010022_check_skb(skb)) { +- skb = realign_skb(skb); ++ a010022_check_skb(skb, priv)) { ++ skb = a010022_realign_skb(skb, priv); + if (!skb) + goto skb_to_fd_failed; + } |