1 files changed, 0 insertions, 299 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0054-dpaa_eth-workaround-for-ERR010022.patch b/target/linux/layerscape/patches-5.4/701-net-0054-dpaa_eth-workaround-for-ERR010022.patch
deleted file mode 100644
index 3c66e5a5f5..0000000000
--- a/target/linux/layerscape/patches-5.4/701-net-0054-dpaa_eth-workaround-for-ERR010022.patch
+++ /dev/null
@@ -1,299 +0,0 @@
-From fced03d891377fa04153fb0538bc8ca95ba05020 Mon Sep 17 00:00:00 2001
-From: Madalin Bucur <madalin.bucur@nxp.com>
-Date: Tue, 14 Nov 2017 08:12:12 +0200
-Subject: [PATCH] dpaa_eth: workaround for ERR010022
-
-On LS1043A SoC there is a known erratum ERR010022 that results in split DMA
-transfers in the FMan under certain conditions. This, combined with a fixed
-size FIFO of ongoing DMA transfers that may overflow when a split occurs,
-results in the FMan stalling DMA transfers under high traffic. To avoid the
-problem, one needs to prevent the DMA transfer splits to occur by preparing
-the buffers as follows.
-
-In order to prevent split transactions, all frames need to be aligned to 16
-bytes and not cross 4K address boundaries. To allow Jumbo frames (up to
-9.6K), all data must be aligned to 256 byes. This way, 4K boundary crossings
-will not trigger any transaction splits.
-
-The errata is prevented from manifesting by realigning all outgoing frames to
-256 byte boundaries. In the process, all S/G frames are linearized.
-
-Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
-Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
-[rebase]
-Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
----
- drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 204 +++++++++++++++++++++++--
- 1 file changed, 194 insertions(+), 10 deletions(-)
-
---- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
-+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
-@@ -54,6 +54,10 @@
- #include <linux/phy_fixed.h>
- #include <soc/fsl/bman.h>
- #include <soc/fsl/qman.h>
-+#if !defined(CONFIG_PPC) && defined(CONFIG_SOC_BUS)
-+#include <linux/sys_soc.h>      /* soc_device_match */
-+#endif
-+
- #include "fman.h"
- #include "fman_port.h"
- #include "mac.h"
-@@ -73,6 +77,10 @@ static u16 tx_timeout = 1000;
- module_param(tx_timeout, ushort, 0444);
- MODULE_PARM_DESC(tx_timeout, "The Tx timeout in ms");
- 
-+#ifndef CONFIG_PPC
-+bool dpaa_errata_a010022;
-+#endif
-+
- #define FM_FD_STAT_RX_ERRORS						\
- 	(FM_FD_ERR_DMA | FM_FD_ERR_PHYSICAL	| \
- 	 FM_FD_ERR_SIZE | FM_FD_ERR_CLS_DISCARD | \
-@@ -1495,7 +1503,19 @@ static int dpaa_bp_add_8_bufs(const stru
- 	u8 i;
- 
- 	for (i = 0; i < 8; i++) {
-+#ifndef CONFIG_PPC
-+		if (dpaa_errata_a010022) {
-+			struct page *page = alloc_page(GFP_KERNEL);
-+
-+			if (unlikely(!page))
-+				goto release_previous_buffs;
-+			new_buf = page_address(page);
-+		} else {
-+			new_buf = netdev_alloc_frag(dpaa_bp->raw_size);
-+		}
-+#else
- 		new_buf = netdev_alloc_frag(dpaa_bp->raw_size);
-+#endif
- 		if (unlikely(!new_buf)) {
- 			dev_err(dev, "netdev_alloc_frag() failed, size %zu\n",
- 				dpaa_bp->raw_size);
-@@ -1663,9 +1683,15 @@ static struct sk_buff *dpaa_cleanup_tx_f
- 		}
- 	}
- 
--	if (qm_fd_get_format(fd) == qm_fd_sg)
--		/* Free the page frag that we allocated on Tx */
--		skb_free_frag(phys_to_virt(addr));
-+	if (qm_fd_get_format(fd) == qm_fd_sg) {
-+#ifndef CONFIG_PPC
-+		if (dpaa_errata_a010022)
-+			put_page(virt_to_page(sgt));
-+		else
-+#endif
-+			/* Free the page frag that we allocated on Tx */
-+			skb_free_frag(phys_to_virt(addr));
-+	}
- 
- 	return skb;
- }
-@@ -1922,14 +1948,26 @@ static int skb_to_sg_fd(struct dpaa_priv
- 	size_t frag_len;
- 	void *sgt_buf;
- 
--	/* get a page frag to store the SGTable */
--	sz = SKB_DATA_ALIGN(priv->tx_headroom + DPAA_SGT_SIZE);
--	sgt_buf = netdev_alloc_frag(sz);
--	if (unlikely(!sgt_buf)) {
--		netdev_err(net_dev, "netdev_alloc_frag() failed for size %d\n",
--			   sz);
--		return -ENOMEM;
-+#ifndef CONFIG_PPC
-+	if (unlikely(dpaa_errata_a010022)) {
-+		struct page *page = alloc_page(GFP_ATOMIC);
-+		if (unlikely(!page))
-+			return -ENOMEM;
-+		sgt_buf = page_address(page);
-+	} else {
-+#endif
-+		/* get a page frag to store the SGTable */
-+		sz = SKB_DATA_ALIGN(priv->tx_headroom + DPAA_SGT_SIZE);
-+		sgt_buf = netdev_alloc_frag(sz);
-+		if (unlikely(!sgt_buf)) {
-+			netdev_err(net_dev,
-+				   "netdev_alloc_frag() failed for size %d\n",
-+				   sz);
-+			return -ENOMEM;
-+		}
-+#ifndef CONFIG_PPC
- 	}
-+#endif
- 
- 	/* Enable L3/L4 hardware checksum computation.
- 	 *
-@@ -2049,6 +2087,122 @@ static inline int dpaa_xmit(struct dpaa_
- 	return 0;
- }
- 
-+#ifndef CONFIG_PPC
-+/* On LS1043A SoC there is a known erratum ERR010022 that results in split DMA
-+ * transfers in the FMan under certain conditions. This, combined with a fixed
-+ * size FIFO of ongoing DMA transfers that may overflow when a split occurs,
-+ * results in the FMan stalling DMA transfers under high traffic. To avoid the
-+ * problem, one needs to prevent the DMA transfer splits to occur by preparing
-+ * the buffers
-+ */
-+
-+#define DPAA_A010022_HEADROOM	256
-+#define CROSS_4K_BOUND(start, size) \
-+	(((start) + (size)) > (((start) + 0x1000) & ~0xFFF))
-+
-+static bool dpaa_errata_a010022_has_dma_issue(struct sk_buff *skb,
-+					      struct dpaa_priv *priv)
-+{
-+	int nr_frags, i = 0;
-+	 skb_frag_t *frag;
-+
-+	/* Transfers that do not start at 16B aligned addresses will be split;
-+	 * Transfers that cross a 4K page boundary will also be split
-+	 */
-+
-+	/* Check if the frame data is aligned to 16 bytes */
-+	if ((uintptr_t)skb->data % DPAA_FD_DATA_ALIGNMENT)
-+		return true;
-+
-+	/* Check if the headroom crosses a boundary */
-+	if (CROSS_4K_BOUND((uintptr_t)skb->head, skb_headroom(skb)))
-+		return true;
-+
-+	/* Check if the non-paged data crosses a boundary */
-+	if (CROSS_4K_BOUND((uintptr_t)skb->data, skb_headlen(skb)))
-+		return true;
-+
-+	nr_frags = skb_shinfo(skb)->nr_frags;
-+
-+	while (i < nr_frags) {
-+		frag = &skb_shinfo(skb)->frags[i];
-+
-+		/* Check if a paged fragment crosses a boundary from its
-+		 * offset to its end.
-+		 */
-+		if (CROSS_4K_BOUND((uintptr_t)frag->page_offset, frag->size))
-+			return true;
-+
-+		i++;
-+	}
-+
-+	return false;
-+}
-+
-+static struct sk_buff *dpaa_errata_a010022_prevent(struct sk_buff *skb,
-+						   struct dpaa_priv *priv)
-+{
-+	int trans_offset = skb_transport_offset(skb);
-+	int net_offset = skb_network_offset(skb);
-+	int nsize, npage_order, headroom;
-+	struct sk_buff *nskb = NULL;
-+	struct page *npage;
-+	void *npage_addr;
-+
-+	if (!dpaa_errata_a010022_has_dma_issue(skb, priv))
-+		return skb;
-+
-+	/* For the new skb we only need the old one's data (both non-paged and
-+	 * paged). We can skip the old tailroom.
-+	 *
-+	 * The headroom also needs to fit our private info (64 bytes) but we
-+	 * reserve 256 bytes instead in order to guarantee that the data is
-+	 * aligned to 256.
-+	 */
-+	headroom = DPAA_A010022_HEADROOM;
-+	nsize = headroom + skb->len +
-+		SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
-+
-+	/* Reserve enough memory to accommodate Jumbo frames */
-+	npage_order = (nsize - 1) / PAGE_SIZE;
-+	npage = alloc_pages(GFP_ATOMIC | __GFP_COMP, npage_order);
-+	if (unlikely(!npage)) {
-+		WARN_ONCE(1, "Memory allocation failure\n");
-+		return NULL;
-+	}
-+	npage_addr = page_address(npage);
-+
-+	nskb = build_skb(npage_addr, nsize);
-+	if (unlikely(!nskb))
-+		goto err;
-+
-+	/* Code borrowed and adapted from skb_copy() */
-+	skb_reserve(nskb, headroom);
-+	skb_put(nskb, skb->len);
-+	if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
-+		WARN_ONCE(1, "skb parsing failure\n");
-+		goto err;
-+	}
-+	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;
-+
-+err:
-+	if (nskb)
-+		dev_kfree_skb(nskb);
-+	put_page(npage);
-+	return NULL;
-+}
-+#endif
-+
- static netdev_tx_t
- dpaa_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
- {
-@@ -2095,6 +2249,15 @@ dpaa_start_xmit(struct sk_buff *skb, str
- 		nonlinear = skb_is_nonlinear(skb);
- 	}
- 
-+#ifndef CONFIG_PPC
-+	if (unlikely(dpaa_errata_a010022)) {
-+		skb = dpaa_errata_a010022_prevent(skb, priv);
-+		if (!skb)
-+			goto enomem;
-+		nonlinear = skb_is_nonlinear(skb);
-+	}
-+#endif
-+
- 	if (nonlinear) {
- 		/* Just create a S/G fd based on the skb */
- 		err = skb_to_sg_fd(priv, skb, &fd);
-@@ -2992,6 +3155,23 @@ static int dpaa_remove(struct platform_d
- 	return err;
- }
- 
-+#ifndef CONFIG_PPC
-+static bool __init soc_has_errata_a010022(void)
-+{
-+#ifdef CONFIG_SOC_BUS
-+	const struct soc_device_attribute soc_msi_matches[] = {
-+		{ .family = "QorIQ LS1043A",
-+		  .data = NULL },
-+		{ },
-+	};
-+
-+	if (!soc_device_match(soc_msi_matches))
-+		return false;
-+#endif
-+	return true; /* cannot identify SoC or errata applies */
-+}
-+#endif
-+
- static const struct platform_device_id dpaa_devtype[] = {
- 	{
- 		.name = "dpaa-ethernet",
-@@ -3016,6 +3196,10 @@ static int __init dpaa_load(void)
- 
- 	pr_debug("FSL DPAA Ethernet driver\n");
- 
-+#ifndef CONFIG_PPC
-+	/* Detect if the current SoC requires the DMA transfer alignment workaround */
-+	dpaa_errata_a010022 = soc_has_errata_a010022();
-+#endif
- 	/* initialize dpaa_eth mirror values */
- 	dpaa_rx_extra_headroom = fman_get_rx_extra_headroom();
- 	dpaa_max_frm = fman_get_max_frm();