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32 lines
1.3 KiB
Diff
32 lines
1.3 KiB
Diff
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From b95f457bb7ba38f03a71b474e35f53670322f0db Mon Sep 17 00:00:00 2001
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From: Camelia Groza <camelia.groza@nxp.com>
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Date: Mon, 15 Jan 2018 17:41:01 +0200
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Subject: [PATCH] sdk_dpaa: update buffer recycling conditions
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Guarantee there is enough space inside the skb's headroom to store the
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skb back-pointer before recycling the buffer. The back-pointer is stored
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right before the buffer's start.
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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_sg.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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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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@@ -350,7 +350,13 @@ bool dpa_buf_is_recyclable(struct sk_buf
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/* left align to the nearest cacheline */
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new = (unsigned char *)((unsigned long)new & ~(SMP_CACHE_BYTES - 1));
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- if (likely(new >= skb->head &&
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+ /* Make sure there is enough space to store the skb back-pointer in
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+ * the headroom, right before the start of the buffer.
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+ *
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+ * Guarantee that both maximum size and maximum data offsets aren't
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+ * crossed.
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+ */
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+ if (likely(new >= (skb->head + sizeof(void *)) &&
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new >= (skb->data - DPA_MAX_FD_OFFSET) &&
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skb_end_pointer(skb) - new <= DPA_RECYCLE_MAX_SIZE)) {
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*new_buf_start = new;
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