net/sfc: fix generic byte statistics to exclude FCS bytes

[ upstream commit 8a69303 ]

Generic byte statistics should not include Ethernet FCS bytes.

Fixes: 1caab2f ("net/sfc: add basic statistics")

Signed-off-by: Viacheslav Galaktionov <viacheslav.galaktionov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

drivers/net/sfc/sfc_ethdev.c

@@ -640,10 +640,19 @@ sfc_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 			mac_stats[EFX_MAC_VADAPTER_TX_BROADCAST_BYTES];
 		stats->imissed = mac_stats[EFX_MAC_VADAPTER_RX_BAD_PACKETS];
 		stats->oerrors = mac_stats[EFX_MAC_VADAPTER_TX_BAD_PACKETS];
+
+		/* CRC is included in these stats, but shouldn't be */
+		stats->ibytes -= stats->ipackets * RTE_ETHER_CRC_LEN;
+		stats->obytes -= stats->opackets * RTE_ETHER_CRC_LEN;
 	} else {
 		stats->opackets = mac_stats[EFX_MAC_TX_PKTS];
 		stats->ibytes = mac_stats[EFX_MAC_RX_OCTETS];
 		stats->obytes = mac_stats[EFX_MAC_TX_OCTETS];
+
+		/* CRC is included in these stats, but shouldn't be */
+		stats->ibytes -= mac_stats[EFX_MAC_RX_PKTS] * RTE_ETHER_CRC_LEN;
+		stats->obytes -= mac_stats[EFX_MAC_TX_PKTS] * RTE_ETHER_CRC_LEN;
+
 		/*
 		 * Take into account stats which are whenever supported
 		 * on EF10. If some stat is not supported by current