From 4528c4cec3332b27ebab11418a5e50125b8b25a4 Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <olteanv@gmail.com>
Date: Sat, 28 Dec 2019 15:30:45 +0200
Subject: [PATCH 2/4] gianfar: Fix TX timestamping with a stacked DSA driver
Git-commit: c26a2c2ddc0115eb088873f5c309cf46b982f522
Patch-mainline: v5.6-rc1
References: git-fixes
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>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ethernet/freescale/gianfar.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index d565a7f9cd06..eb92adbdc904 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2684,13 +2684,17 @@ static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
skb_dirtytx = tx_queue->skb_dirtytx;
while ((skb = tx_queue->tx_skbuff[skb_dirtytx])) {
+ 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;
@@ -2704,7 +2708,7 @@ static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
(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 = be16_to_cpu(next->length) +
GMAC_FCB_LEN + GMAC_TXPAL_LEN;
@@ -2714,7 +2718,7 @@ static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
dma_unmap_single(priv->dev, be32_to_cpu(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 *)(((uintptr_t)skb->data + 0x10) &
~0x7UL);
--
2.16.4