linux-kernel - [PATCH net-next] net: rtnetlink: add rx_otherhost_dropped for struct rtnl_link

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Message-Id: <20220708063257.1192311-1-yajun.deng@linux.dev>
Date:   Fri,  8 Jul 2022 14:32:57 +0800
From:   Yajun Deng <yajun.deng@...ux.dev>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH net-next] net: rtnetlink: add rx_otherhost_dropped for struct rtnl_link_stats

The commit 794c24e9921f ("net-core: rx_otherhost_dropped to core_stats")
introduce rx_otherhost_dropped, add rx_otherhost_dropped for struct
rtnl_link_stats to keep sync with struct rtnl_link_stats64.

As the same time, add BUILD_BUG_ON() in copy_rtnl_link_stats().

Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
---
 include/uapi/linux/if_link.h |  1 +
 net/core/rtnetlink.c         | 36 +++++++-----------------------------
 2 files changed, 8 insertions(+), 29 deletions(-)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index e36d9d2c65a7..fd6776d665c8 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -37,6 +37,7 @@ struct rtnl_link_stats {
 	__u32	tx_compressed;
 
 	__u32	rx_nohandler;
+	__u32   rx_otherhost_dropped;
 };
 
 /**
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index ac45328607f7..818649850b2c 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -908,35 +908,13 @@ static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 				 const struct rtnl_link_stats64 *b)
 {
-	a->rx_packets = b->rx_packets;
-	a->tx_packets = b->tx_packets;
-	a->rx_bytes = b->rx_bytes;
-	a->tx_bytes = b->tx_bytes;
-	a->rx_errors = b->rx_errors;
-	a->tx_errors = b->tx_errors;
-	a->rx_dropped = b->rx_dropped;
-	a->tx_dropped = b->tx_dropped;
-
-	a->multicast = b->multicast;
-	a->collisions = b->collisions;
-
-	a->rx_length_errors = b->rx_length_errors;
-	a->rx_over_errors = b->rx_over_errors;
-	a->rx_crc_errors = b->rx_crc_errors;
-	a->rx_frame_errors = b->rx_frame_errors;
-	a->rx_fifo_errors = b->rx_fifo_errors;
-	a->rx_missed_errors = b->rx_missed_errors;
-
-	a->tx_aborted_errors = b->tx_aborted_errors;
-	a->tx_carrier_errors = b->tx_carrier_errors;
-	a->tx_fifo_errors = b->tx_fifo_errors;
-	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
-	a->tx_window_errors = b->tx_window_errors;
-
-	a->rx_compressed = b->rx_compressed;
-	a->tx_compressed = b->tx_compressed;
-
-	a->rx_nohandler = b->rx_nohandler;
+	size_t i, n = sizeof(*b) / sizeof(u64);
+	const u64 *src = (const u64 *)b;
+	u32 *dst = (u32 *)a;
+
+	BUILD_BUG_ON(n != sizeof(*a) / sizeof(u32));
+	for (i = 0; i < n; i++)
+		dst[i] = src[i];
 }
 
 /* All VF info */
-- 
2.25.1