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From:   Justin Chen <justin.chen@broadcom.com>
To:     netdev@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        bcm-kernel-feedback-list@broadcom.com
Cc:     florian.fainelli@broadcom.com, davem@davemloft.net,
        edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
        robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        conor+dt@kernel.org, opendmb@gmail.com, andrew@lunn.ch,
        hkallweit1@gmail.com, linux@armlinux.org.uk,
        richardcochran@gmail.com, sumit.semwal@linaro.org,
        simon.horman@corigine.com, christian.koenig@amd.com,
        Justin Chen <justin.chen@broadcom.com>
Subject: [net-next v9 08/11] net: bcmasp: Add support for ethtool driver stats
Date:   Thu, 13 Jul 2023 15:19:03 -0700
Message-Id: <1689286746-43609-9-git-send-email-justin.chen@broadcom.com>
In-Reply-To: <1689286746-43609-1-git-send-email-justin.chen@broadcom.com>
References: <1689286746-43609-1-git-send-email-justin.chen@broadcom.com>
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        boundary="00000000000022ede4060065bacc"
Precedence: bulk

--00000000000022ede4060065bacc

Add support for ethernet driver specific stats.

Signed-off-by: Justin Chen <justin.chen@broadcom.com>
---
v9
        - Removed tx_realloc_offload, this stat is no longer relevant with
          skb_cow_head().
	- Added tx_timeout_cnt

v8
	- Address maybe uninit variable warning

 drivers/net/ethernet/broadcom/asp2/bcmasp.c        |   4 +-
 drivers/net/ethernet/broadcom/asp2/bcmasp.h        |  21 +++
 .../net/ethernet/broadcom/asp2/bcmasp_ethtool.c    | 160 +++++++++++++++++++++
 drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c   |  18 ++-
 4 files changed, 199 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.c b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
index 92dfea961add..a9984efff6d1 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
@@ -895,8 +895,10 @@ int bcmasp_set_en_mda_filter(struct bcmasp_intf *intf, unsigned char *addr,
 
 		/* Attempt to combine filters */
 		ret = bcmasp_combine_set_filter(intf, addr, mask, i);
-		if (!ret)
+		if (!ret) {
+			intf->mib.filters_combine_cnt++;
 			return 0;
+		}
 	}
 
 	/* Create new filter if possible */
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.h b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
index 18a44044ad93..6bfcaa7f95a8 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp.h
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.h
@@ -244,6 +244,26 @@ struct bcmasp_intf_stats64 {
 	struct u64_stats_sync		syncp;
 };
 
+struct bcmasp_mib_counters {
+	u32	edpkt_ts;
+	u32	edpkt_rx_pkt_cnt;
+	u32	edpkt_hdr_ext_cnt;
+	u32	edpkt_hdr_out_cnt;
+	u32	umac_frm_cnt;
+	u32	fb_frm_cnt;
+	u32	fb_rx_fifo_depth;
+	u32	fb_out_frm_cnt;
+	u32	fb_filt_out_frm_cnt;
+	u32	alloc_rx_skb_failed;
+	u32	tx_dma_failed;
+	u32	mc_filters_full_cnt;
+	u32	uc_filters_full_cnt;
+	u32	filters_combine_cnt;
+	u32	promisc_filters_cnt;
+	u32	tx_realloc_offload_failed;
+	u32	tx_timeout_cnt;
+};
+
 struct bcmasp_intf_ops {
 	unsigned long (*rx_desc_read)(struct bcmasp_intf *intf);
 	void (*rx_buffer_write)(struct bcmasp_intf *intf, dma_addr_t addr);
@@ -309,6 +329,7 @@ struct bcmasp_intf {
 
 	/* Statistics */
 	struct bcmasp_intf_stats64	stats64;
+	struct bcmasp_mib_counters	mib;
 
 	u32				wolopts;
 	u8				sopass[SOPASS_MAX];
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c
index 59d853c2293c..c4f1604d5ab3 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_ethtool.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #define pr_fmt(fmt)				"bcmasp_ethtool: " fmt
 
+#include <asm-generic/unaligned.h>
 #include <linux/ethtool.h>
 #include <linux/netdevice.h>
 #include <linux/platform_device.h>
@@ -8,6 +9,162 @@
 #include "bcmasp.h"
 #include "bcmasp_intf_defs.h"
 
+enum bcmasp_stat_type {
+	BCMASP_STAT_RX_EDPKT,
+	BCMASP_STAT_RX_CTRL,
+	BCMASP_STAT_RX_CTRL_PER_INTF,
+	BCMASP_STAT_SOFT,
+};
+
+struct bcmasp_stats {
+	char stat_string[ETH_GSTRING_LEN];
+	enum bcmasp_stat_type type;
+	u32 reg_offset;
+};
+
+#define STAT_BCMASP_SOFT_MIB(str) { \
+	.stat_string = str, \
+	.type = BCMASP_STAT_SOFT, \
+}
+
+#define STAT_BCMASP_OFFSET(str, _type, offset) { \
+	.stat_string = str, \
+	.type = _type, \
+	.reg_offset = offset, \
+}
+
+#define STAT_BCMASP_RX_EDPKT(str, offset) \
+	STAT_BCMASP_OFFSET(str, BCMASP_STAT_RX_EDPKT, offset)
+#define STAT_BCMASP_RX_CTRL(str, offset) \
+	STAT_BCMASP_OFFSET(str, BCMASP_STAT_RX_CTRL, offset)
+#define STAT_BCMASP_RX_CTRL_PER_INTF(str, offset) \
+	STAT_BCMASP_OFFSET(str, BCMASP_STAT_RX_CTRL_PER_INTF, offset)
+
+/* Must match the order of struct bcmasp_mib_counters */
+static const struct bcmasp_stats bcmasp_gstrings_stats[] = {
+	/* EDPKT counters */
+	STAT_BCMASP_RX_EDPKT("RX Time Stamp", ASP_EDPKT_RX_TS_COUNTER),
+	STAT_BCMASP_RX_EDPKT("RX PKT Count", ASP_EDPKT_RX_PKT_CNT),
+	STAT_BCMASP_RX_EDPKT("RX PKT Buffered", ASP_EDPKT_HDR_EXTR_CNT),
+	STAT_BCMASP_RX_EDPKT("RX PKT Pushed to DRAM", ASP_EDPKT_HDR_OUT_CNT),
+	/* ASP RX control */
+	STAT_BCMASP_RX_CTRL_PER_INTF("Frames From Unimac",
+				     ASP_RX_CTRL_UMAC_0_FRAME_COUNT),
+	STAT_BCMASP_RX_CTRL_PER_INTF("Frames From Port",
+				     ASP_RX_CTRL_FB_0_FRAME_COUNT),
+	STAT_BCMASP_RX_CTRL_PER_INTF("RX Buffer FIFO Depth",
+				     ASP_RX_CTRL_FB_RX_FIFO_DEPTH),
+	STAT_BCMASP_RX_CTRL("Frames Out(Buffer)",
+			    ASP_RX_CTRL_FB_OUT_FRAME_COUNT),
+	STAT_BCMASP_RX_CTRL("Frames Out(Filters)",
+			    ASP_RX_CTRL_FB_FILT_OUT_FRAME_COUNT),
+	/* Software maintained statistics */
+	STAT_BCMASP_SOFT_MIB("RX SKB Alloc Failed"),
+	STAT_BCMASP_SOFT_MIB("TX DMA Failed"),
+	STAT_BCMASP_SOFT_MIB("Multicast Filters Full"),
+	STAT_BCMASP_SOFT_MIB("Unicast Filters Full"),
+	STAT_BCMASP_SOFT_MIB("MDA Filters Combined"),
+	STAT_BCMASP_SOFT_MIB("Promisc Filter Set"),
+	STAT_BCMASP_SOFT_MIB("TX Realloc For Offload Failed"),
+	STAT_BCMASP_SOFT_MIB("Tx Timeout Count"),
+};
+
+#define BCMASP_STATS_LEN	ARRAY_SIZE(bcmasp_gstrings_stats)
+
+static u16 bcmasp_stat_fixup_offset(struct bcmasp_intf *intf,
+				    const struct bcmasp_stats *s)
+{
+	struct bcmasp_priv *priv = intf->parent;
+
+	if (!strcmp("Frames Out(Buffer)", s->stat_string))
+		return priv->hw_info->rx_ctrl_fb_out_frame_count;
+
+	if (!strcmp("Frames Out(Filters)", s->stat_string))
+		return priv->hw_info->rx_ctrl_fb_filt_out_frame_count;
+
+	if (!strcmp("RX Buffer FIFO Depth", s->stat_string))
+		return priv->hw_info->rx_ctrl_fb_rx_fifo_depth;
+
+	return s->reg_offset;
+}
+
+static int bcmasp_get_sset_count(struct net_device *dev, int string_set)
+{
+	switch (string_set) {
+	case ETH_SS_STATS:
+		return BCMASP_STATS_LEN;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void bcmasp_get_strings(struct net_device *dev, u32 stringset,
+			       u8 *data)
+{
+	unsigned int i;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < BCMASP_STATS_LEN; i++) {
+			memcpy(data + i * ETH_GSTRING_LEN,
+			       bcmasp_gstrings_stats[i].stat_string,
+			       ETH_GSTRING_LEN);
+		}
+		break;
+	default:
+		return;
+	}
+}
+
+static void bcmasp_update_mib_counters(struct bcmasp_intf *intf)
+{
+	unsigned int i;
+
+	for (i = 0; i < BCMASP_STATS_LEN; i++) {
+		const struct bcmasp_stats *s;
+		u32 offset, val;
+		char *p;
+
+		s = &bcmasp_gstrings_stats[i];
+		offset = bcmasp_stat_fixup_offset(intf, s);
+		switch (s->type) {
+		case BCMASP_STAT_SOFT:
+			continue;
+		case BCMASP_STAT_RX_EDPKT:
+			val = rx_edpkt_core_rl(intf->parent, offset);
+			break;
+		case BCMASP_STAT_RX_CTRL:
+			val = rx_ctrl_core_rl(intf->parent, offset);
+			break;
+		case BCMASP_STAT_RX_CTRL_PER_INTF:
+			offset += sizeof(u32) * intf->port;
+			val = rx_ctrl_core_rl(intf->parent, offset);
+			break;
+		default:
+			continue;
+		}
+		p = (char *)(&intf->mib) + (i * sizeof(u32));
+		put_unaligned(val, (u32 *)p);
+	}
+}
+
+static void bcmasp_get_ethtool_stats(struct net_device *dev,
+				     struct ethtool_stats *stats,
+				     u64 *data)
+{
+	struct bcmasp_intf *intf = netdev_priv(dev);
+	unsigned int i;
+	char *p;
+
+	if (netif_running(dev))
+		bcmasp_update_mib_counters(intf);
+
+	for (i = 0; i < BCMASP_STATS_LEN; i++) {
+		p = (char *)(&intf->mib) + (i * sizeof(u32));
+		data[i] = *(u32 *)p;
+	}
+}
+
 static void bcmasp_get_drvinfo(struct net_device *dev,
 			       struct ethtool_drvinfo *info)
 {
@@ -340,4 +497,7 @@ const struct ethtool_ops bcmasp_ethtool_ops = {
 	.get_eth_mac_stats	= bcmasp_get_eth_mac_stats,
 	.get_rmon_stats		= bcmasp_get_rmon_stats,
 	.get_eth_ctrl_stats	= bcmasp_get_eth_ctrl_stats,
+	.get_strings		= bcmasp_get_strings,
+	.get_ethtool_stats	= bcmasp_get_ethtool_stats,
+	.get_sset_count		= bcmasp_get_sset_count,
 };
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index 051f882b2766..53e542881255 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -104,15 +104,19 @@ static void bcmasp_set_rx_mode(struct net_device *dev)
 
 		netdev_for_each_mc_addr(ha, dev) {
 			ret = bcmasp_set_en_mda_filter(intf, ha->addr, mask);
-			if (ret)
+			if (ret) {
+				intf->mib.mc_filters_full_cnt++;
 				goto set_promisc;
+			}
 		}
 	}
 
 	netdev_for_each_uc_addr(ha, dev) {
 		ret = bcmasp_set_en_mda_filter(intf, ha->addr, mask);
-		if (ret)
+		if (ret) {
+			intf->mib.uc_filters_full_cnt++;
 			goto set_promisc;
+		}
 	}
 
 	spin_unlock_bh(&intf->parent->mda_lock);
@@ -120,6 +124,7 @@ static void bcmasp_set_rx_mode(struct net_device *dev)
 
 set_promisc:
 	bcmasp_set_promisc(intf, 1);
+	intf->mib.promisc_filters_cnt++;
 
 	/* disable all filters used by this port */
 	bcmasp_disable_all_filters(intf);
@@ -155,6 +160,7 @@ static struct sk_buff *bcmasp_csum_offload(struct net_device *dev,
 					   struct sk_buff *skb,
 					   bool *csum_hw)
 {
+	struct bcmasp_intf *intf = netdev_priv(dev);
 	u32 header = 0, header2 = 0, epkt = 0;
 	struct bcmasp_pkt_offload *offload;
 	unsigned int header_cnt = 0;
@@ -165,8 +171,10 @@ static struct sk_buff *bcmasp_csum_offload(struct net_device *dev,
 		return skb;
 
 	ret = skb_cow_head(skb, sizeof(*offload));
-	if (ret < 0)
+	if (ret < 0) {
+		intf->mib.tx_realloc_offload_failed++;
 		goto help;
+	}
 
 	switch (skb->protocol) {
 	case htons(ETH_P_IP):
@@ -305,6 +313,7 @@ static netdev_tx_t bcmasp_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 
 		if (dma_mapping_error(kdev, mapping)) {
+			intf->mib.tx_dma_failed++;
 			spb_index = intf->tx_spb_index;
 			for (j = 0; j < i; j++) {
 				bcmasp_clean_txcb(intf, spb_index);
@@ -541,6 +550,8 @@ static int bcmasp_rx_poll(struct napi_struct *napi, int budget)
 			u64_stats_update_begin(&stats->syncp);
 			u64_stats_inc(&stats->rx_dropped);
 			u64_stats_update_end(&stats->syncp);
+			intf->mib.alloc_rx_skb_failed++;
+
 			goto next;
 		}
 
@@ -1116,6 +1127,7 @@ static void bcmasp_tx_timeout(struct net_device *dev, unsigned int txqueue)
 	struct bcmasp_intf *intf = netdev_priv(dev);
 
 	netif_dbg(intf, tx_err, dev, "transmit timeout!\n");
+	intf->mib.tx_timeout_cnt++;
 }
 
 static int bcmasp_get_phys_port_name(struct net_device *dev,
-- 
2.7.4


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