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58 lines
2.2 KiB
Diff
58 lines
2.2 KiB
Diff
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From 29757ae2e4a0e8e1e816c9eeef59121908320669 Mon Sep 17 00:00:00 2001
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From: Camelia Groza <camelia.groza@nxp.com>
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Date: Wed, 20 Jun 2018 18:00:42 +0300
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Subject: [PATCH] sdk_dpaa: reserve 256 bytes for the SGT on TX
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The FMan reads 256 bytes from the start of the SGT regardless of its
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size. We reserve the same amount of memory on TX to access.
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Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
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---
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drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.h | 6 ++++--
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drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c | 10 +++++++---
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2 files changed, 11 insertions(+), 5 deletions(-)
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--- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.h
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+++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.h
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@@ -55,10 +55,12 @@
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fm_set_##type##_port_params(port, ¶m); \
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}
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+/* The SGT needs to be 256 bytes long. Even if the table has only one entry,
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+ * the FMan will read 256 bytes from its start.
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+ */
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+#define DPA_SGT_SIZE 256
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#define DPA_SGT_MAX_ENTRIES 16 /* maximum number of entries in SG Table */
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-#define DPA_SGT_ENTRIES_THRESHOLD DPA_SGT_MAX_ENTRIES
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-
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#define DPA_BUFF_RELEASE_MAX 8 /* maximum number of buffers released at once */
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#define DPA_RX_PCD_HI_PRIO_FQ_INIT_FAIL(dpa_fq, _errno) \
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--- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
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+++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
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@@ -246,8 +246,8 @@ struct sk_buff *_dpa_cleanup_tx_fd(const
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if (unlikely(fd->format == qm_fd_sg)) {
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nr_frags = skb_shinfo(skb)->nr_frags;
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- dma_unmap_single(dpa_bp->dev, addr, dpa_fd_offset(fd) +
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- sizeof(struct qm_sg_entry) * (1 + nr_frags),
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+ dma_unmap_single(dpa_bp->dev, addr,
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+ dpa_fd_offset(fd) + DPA_SGT_SIZE,
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dma_dir);
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/* The sgt buffer has been allocated with netdev_alloc_frag(),
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@@ -896,7 +896,11 @@ int __hot skb_to_sg_fd(struct dpa_priv_s
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nr_frags = skb_shinfo(skb)->nr_frags;
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fd->format = qm_fd_sg;
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- sgt_size = sizeof(struct qm_sg_entry) * (1 + nr_frags);
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+ /* The FMan reads 256 bytes from the start of the SGT regardless of
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+ * its size. In accordance, we reserve the same amount of memory as
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+ * well.
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+ */
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+ sgt_size = DPA_SGT_SIZE;
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/* Get a page frag to store the SGTable, or a full page if the errata
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* is in place and we need to avoid crossing a 4k boundary.
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