FAILED: patch "[PATCH] macsec: use DEV_STATS_INC()" failed to apply to 5.10-stable tree

[gre...@linuxfoundation.org]

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <sta...@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 32d0a49d36a2a306c2e47fe5659361e424f0ed3f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<sta...@vger.kernel.org>' --in-reply-to '2023081213-squeamish-uninsured-f712@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

32d0a49d36a2 ("macsec: use DEV_STATS_INC()")
91ec9bd57f35 ("macsec: Fix traffic counters/statistics")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 32d0a49d36a2a306c2e47fe5659361e424f0ed3f Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edum...@google.com>
Date: Fri, 4 Aug 2023 17:26:52 +0000
Subject: [PATCH] macsec: use DEV_STATS_INC()

syzbot/KCSAN reported data-races in macsec whenever dev->stats fields
are updated.

It appears all of these updates can happen from multiple cpus.

Adopt SMP safe DEV_STATS_INC() to update dev->stats fields.

Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
Reported-by: syzbot <syzk...@googlegroups.com>
Signed-off-by: Eric Dumazet <edum...@google.com>
Cc: Sabrina Dubroca <s...@queasysnail.net>
Signed-off-by: David S. Miller <da...@davemloft.net>

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 984dfa5d6c11..144ec756c796 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -743,7 +743,7 @@ static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
- secy->netdev->stats.rx_dropped++;
+ DEV_STATS_INC(secy->netdev, rx_dropped);
return false;
}

@@ -767,7 +767,7 @@ static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u
rxsc_stats->stats.InPktsNotValid++;
u64_stats_update_end(&rxsc_stats->syncp);
this_cpu_inc(rx_sa->stats->InPktsNotValid);
- secy->netdev->stats.rx_errors++;
+ DEV_STATS_INC(secy->netdev, rx_errors);
return false;
}

@@ -1069,7 +1069,7 @@ static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsNoTag++;
u64_stats_update_end(&secy_stats->syncp);
- macsec->secy.netdev->stats.rx_dropped++;
+ DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
continue;
}

@@ -1179,7 +1179,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsBadTag++;
u64_stats_update_end(&secy_stats->syncp);
- secy->netdev->stats.rx_errors++;
+ DEV_STATS_INC(secy->netdev, rx_errors);
goto drop_nosa;
}

@@ -1196,7 +1196,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsNotUsingSA++;
u64_stats_update_end(&rxsc_stats->syncp);
- secy->netdev->stats.rx_errors++;
+ DEV_STATS_INC(secy->netdev, rx_errors);
if (active_rx_sa)
this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
goto drop_nosa;
@@ -1230,7 +1230,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
- macsec->secy.netdev->stats.rx_dropped++;
+ DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
goto drop;
}
}
@@ -1271,7 +1271,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
if (ret == NET_RX_SUCCESS)
count_rx(dev, len);
else
- macsec->secy.netdev->stats.rx_dropped++;
+ DEV_STATS_INC(macsec->secy.netdev, rx_dropped);

rcu_read_unlock();

@@ -1308,7 +1308,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsNoSCI++;
u64_stats_update_end(&secy_stats->syncp);
- macsec->secy.netdev->stats.rx_errors++;
+ DEV_STATS_INC(macsec->secy.netdev, rx_errors);
continue;
}

@@ -1327,7 +1327,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
secy_stats->stats.InPktsUnknownSCI++;
u64_stats_update_end(&secy_stats->syncp);
} else {
- macsec->secy.netdev->stats.rx_dropped++;
+ DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
}
}

@@ -3422,7 +3422,7 @@ static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,

if (!secy->operational) {
kfree_skb(skb);
- dev->stats.tx_dropped++;
+ DEV_STATS_INC(dev, tx_dropped);
return NETDEV_TX_OK;
}

@@ -3430,7 +3430,7 @@ static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
skb = macsec_encrypt(skb, dev);
if (IS_ERR(skb)) {
if (PTR_ERR(skb) != -EINPROGRESS)
- dev->stats.tx_dropped++;
+ DEV_STATS_INC(dev, tx_dropped);
return NETDEV_TX_OK;
}

@@ -3667,9 +3667,9 @@ static void macsec_get_stats64(struct net_device *dev,

dev_fetch_sw_netstats(s, dev->tstats);

- s->rx_dropped = dev->stats.rx_dropped;
- s->tx_dropped = dev->stats.tx_dropped;
- s->rx_errors = dev->stats.rx_errors;
+ s->rx_dropped = atomic_long_read(&dev->stats.__rx_dropped);
+ s->tx_dropped = atomic_long_read(&dev->stats.__tx_dropped);
+ s->rx_errors = atomic_long_read(&dev->stats.__rx_errors);
}

static int macsec_get_iflink(const struct net_device *dev)