dpaa2-eth: add channel stat to debugfs

Compute the average number of frames processed for each CDAN (Channel
Data Availability Notification) and export it to debugfs detailed
channel stats.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-debugfs.c

@@ -127,16 +127,19 @@ static int dpaa2_dbg_ch_show(struct seq_file *file, void *offset)
 	int i;
 
 	seq_printf(file, "Channel stats for %s:\n", priv->net_dev->name);
-	seq_printf(file, "%s%16s%16s%16s%16s\n",
-		   "CHID", "CPU", "Deq busy", "CDANs", "Buf count");
+	seq_printf(file, "%s%16s%16s%16s%16s%16s%16s\n",
+		   "CHID", "CPU", "Deq busy", "Frames", "CDANs",
+		   "Avg Frm/CDAN", "Buf count");
 
 	for (i = 0; i < priv->num_channels; i++) {
 		ch = priv->channel[i];
-		seq_printf(file, "%4d%16d%16llu%16llu%16d\n",
+		seq_printf(file, "%4d%16d%16llu%16llu%16llu%16llu%16d\n",
 			   ch->ch_id,
 			   ch->nctx.desired_cpu,
 			   ch->stats.dequeue_portal_busy,
+			   ch->stats.frames,
 			   ch->stats.cdan,
+			   ch->stats.frames / ch->stats.cdan,
 			   ch->buf_count);
 	}
 

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

@@ -493,6 +493,7 @@ static int consume_frames(struct dpaa2_eth_channel *ch,
 		return 0;
 
 	fq->stats.frames += cleaned;
+	ch->stats.frames += cleaned;
 
 	/* A dequeue operation only pulls frames from a single queue
 	 * into the store. Return the frame queue as an out param.

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h

@@ -288,6 +288,8 @@ struct dpaa2_eth_ch_stats {
 	__u64 xdp_tx;
 	__u64 xdp_tx_err;
 	__u64 xdp_redirect;
+	/* Must be last, does not show up in ethtool stats */
+	__u64 frames;
 };
 
 /* Maximum number of queues associated with a DPNI */

drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c

@@ -277,7 +277,7 @@ static void dpaa2_eth_get_ethtool_stats(struct net_device *net_dev,
 	/* Per-channel stats */
 	for (k = 0; k < priv->num_channels; k++) {
 		ch_stats = &priv->channel[k]->stats;
-		for (j = 0; j < sizeof(*ch_stats) / sizeof(__u64); j++)
+		for (j = 0; j < sizeof(*ch_stats) / sizeof(__u64) - 1; j++)
 			*((__u64 *)data + i + j) += *((__u64 *)ch_stats + j);
 	}
 	i += j;