3.16.84-rc1 review patch. If anyone has any objections, please let me know.
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From: Vladimir Oltean olteanv@gmail.com
commit c26a2c2ddc0115eb088873f5c309cf46b982f522 upstream.
The driver wrongly assumes that it is the only entity that can set the SKBTX_IN_PROGRESS bit of the current skb. Therefore, in the gfar_clean_tx_ring function, where the TX timestamp is collected if necessary, the aforementioned bit is used to discriminate whether or not the TX timestamp should be delivered to the socket's error queue.
But a stacked driver such as a DSA switch can also set the SKBTX_IN_PROGRESS bit, which is actually exactly what it should do in order to denote that the hardware timestamping process is undergoing.
Therefore, gianfar would misinterpret the "in progress" bit as being its own, and deliver a second skb clone in the socket's error queue, completely throwing off a PTP process which is not expecting to receive it, _even though_ TX timestamping is not enabled for gianfar.
There have been discussions [0] as to whether non-MAC drivers need or not to set SKBTX_IN_PROGRESS at all (whose purpose is to avoid sending 2 timestamps, a sw and a hw one, to applications which only expect one). But as of this patch, there are at least 2 PTP drivers that would break in conjunction with gianfar: the sja1105 DSA switch and the felix switch, by way of its ocelot core driver.
So regardless of that conclusion, fix the gianfar driver to not do stuff based on flags set by others and not intended for it.
[0]: https://www.spinics.net/lists/netdev/msg619699.html
Fixes: f0ee7acfcdd4 ("gianfar: Add hardware TX timestamping support") Signed-off-by: Vladimir Oltean olteanv@gmail.com Acked-by: Richard Cochran richardcochran@gmail.com Signed-off-by: David S. Miller davem@davemloft.net [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/net/ethernet/freescale/gianfar.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/freescale/gianfar.c +++ b/drivers/net/ethernet/freescale/gianfar.c @@ -2524,13 +2524,17 @@ static void gfar_clean_tx_ring(struct gf
while ((skb = tx_queue->tx_skbuff[skb_dirtytx])) { unsigned long flags; + bool do_tstamp; + + do_tstamp = (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) && + priv->hwts_tx_en;
frags = skb_shinfo(skb)->nr_frags;
/* When time stamping, one additional TxBD must be freed. * Also, we need to dma_unmap_single() the TxPAL. */ - if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) + if (unlikely(do_tstamp)) nr_txbds = frags + 2; else nr_txbds = frags + 1; @@ -2544,7 +2548,7 @@ static void gfar_clean_tx_ring(struct gf (lstatus & BD_LENGTH_MASK)) break;
- if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) { + if (unlikely(do_tstamp)) { next = next_txbd(bdp, base, tx_ring_size); buflen = next->length + GMAC_FCB_LEN + GMAC_TXPAL_LEN; } else @@ -2553,7 +2557,7 @@ static void gfar_clean_tx_ring(struct gf dma_unmap_single(priv->dev, bdp->bufPtr, buflen, DMA_TO_DEVICE);
- if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) { + if (unlikely(do_tstamp)) { struct skb_shared_hwtstamps shhwtstamps; u64 *ns = (u64*) (((u32)skb->data + 0x10) & ~0x7);