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Subject[PATCH RFC 08/10] dpaa_eth: add debugfs counters
Date
Add a series of counters to be exported through debugfs:
- add detailed counters for reception errors;
- add detailed counters for QMan enqueue reject events;
- count the number of fragmented skbs received from the stack;
- count all frames received on the Tx confirmation path;
- add congestion group statistics;
- count the number of interrupts for each CPU.

Signed-off-by: Madalin Bucur <madalin.bucur@freescale.com>
---
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 12 +++++++
drivers/net/ethernet/freescale/dpaa/dpaa_eth.h | 35 ++++++++++++++++++
.../net/ethernet/freescale/dpaa/dpaa_eth_common.c | 41 ++++++++++++++++++++--
.../net/ethernet/freescale/dpaa/dpaa_eth_common.h | 2 ++
drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c | 1 +
5 files changed, 89 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index f50638e7..eba0809 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -99,6 +99,15 @@ static void _dpa_rx_error(struct net_device *net_dev,

percpu_priv->stats.rx_errors++;

+ if (fd->status & FM_PORT_FRM_ERR_DMA)
+ percpu_priv->rx_errors.dme++;
+ if (fd->status & FM_PORT_FRM_ERR_PHYSICAL)
+ percpu_priv->rx_errors.fpe++;
+ if (fd->status & FM_PORT_FRM_ERR_SIZE)
+ percpu_priv->rx_errors.fse++;
+ if (fd->status & FM_PORT_FRM_ERR_PRS_HDR_ERR)
+ percpu_priv->rx_errors.phe++;
+
dpa_fd_release(net_dev, fd);
}

@@ -162,6 +171,8 @@ static void __hot _dpa_tx_conf(struct net_device *net_dev,
percpu_priv->stats.tx_errors++;
}

+ percpu_priv->tx_confirm++;
+
skb = _dpa_cleanup_tx_fd(priv, fd);

dev_kfree_skb(skb);
@@ -297,6 +308,7 @@ static void priv_ern(struct qman_portal *portal,

percpu_priv->stats.tx_dropped++;
percpu_priv->stats.tx_fifo_errors++;
+ count_ern(percpu_priv, msg);

/* If we intended this buffer to go into the pool
* when the FM was done, we need to put it in
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
index 117627b..761063d 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
@@ -199,6 +199,25 @@ struct dpa_bp {
void (*free_buf_cb)(void *addr);
};

+struct dpa_rx_errors {
+ u64 dme; /* DMA Error */
+ u64 fpe; /* Frame Physical Error */
+ u64 fse; /* Frame Size Error */
+ u64 phe; /* Header Error */
+};
+
+/* Counters for QMan ERN frames - one counter per rejection code */
+struct dpa_ern_cnt {
+ u64 cg_tdrop; /* Congestion group taildrop */
+ u64 wred; /* WRED congestion */
+ u64 err_cond; /* Error condition */
+ u64 early_window; /* Order restoration, frame too early */
+ u64 late_window; /* Order restoration, frame too late */
+ u64 fq_tdrop; /* FQ taildrop */
+ u64 fq_retired; /* FQ is retired */
+ u64 orp_zero; /* ORP disabled */
+};
+
struct dpa_napi_portal {
struct napi_struct napi;
struct qman_portal *p;
@@ -207,7 +226,13 @@ struct dpa_napi_portal {
struct dpa_percpu_priv_s {
struct net_device *net_dev;
struct dpa_napi_portal *np;
+ u64 in_interrupt;
+ u64 tx_confirm;
+ /* fragmented (non-linear) skbuffs received from the stack */
+ u64 tx_frag_skbuffs;
struct rtnl_link_stats64 stats;
+ struct dpa_rx_errors rx_errors;
+ struct dpa_ern_cnt ern_cnt;
};

struct dpa_priv_s {
@@ -235,6 +260,15 @@ struct dpa_priv_s {
* (and the same) congestion group.
*/
struct qman_cgr cgr;
+ /* If congested, when it began. Used for performance stats. */
+ u32 congestion_start_jiffies;
+ /* Number of jiffies the Tx port was congested. */
+ u32 congested_jiffies;
+ /**
+ * Counter for the number of times the CGR
+ * entered congestion state
+ */
+ u32 cgr_congested_count;
} cgr_data;
/* Use a per-port CGR for ingress traffic. */
bool use_ingress_cgr;
@@ -296,6 +330,7 @@ static inline int dpaa_eth_napi_schedule(struct dpa_percpu_priv_s *percpu_priv,

np->p = portal;
napi_schedule(&np->napi);
+ percpu_priv->in_interrupt++;
return 1;
}
}
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
index 7921b64..e92183a 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
@@ -782,10 +782,15 @@ static void dpaa_eth_cgscn(struct qman_portal *qm, struct qman_cgr *cgr,
struct dpa_priv_s *priv = (struct dpa_priv_s *)container_of(cgr,
struct dpa_priv_s, cgr_data.cgr);

- if (congested)
+ if (congested) {
+ priv->cgr_data.congestion_start_jiffies = jiffies;
netif_tx_stop_all_queues(priv->net_dev);
- else
+ priv->cgr_data.cgr_congested_count++;
+ } else {
+ priv->cgr_data.congested_jiffies +=
+ (jiffies - priv->cgr_data.congestion_start_jiffies);
netif_tx_wake_all_queues(priv->net_dev);
+ }
}

int dpaa_eth_cgr_init(struct dpa_priv_s *priv)
@@ -1226,6 +1231,38 @@ dpa_fd_release(const struct net_device *net_dev, const struct qm_fd *fd)
}
EXPORT_SYMBOL(dpa_fd_release);

+void count_ern(struct dpa_percpu_priv_s *percpu_priv,
+ const struct qm_mr_entry *msg)
+{
+ switch (msg->ern.rc & QM_MR_RC_MASK) {
+ case QM_MR_RC_CGR_TAILDROP:
+ percpu_priv->ern_cnt.cg_tdrop++;
+ break;
+ case QM_MR_RC_WRED:
+ percpu_priv->ern_cnt.wred++;
+ break;
+ case QM_MR_RC_ERROR:
+ percpu_priv->ern_cnt.err_cond++;
+ break;
+ case QM_MR_RC_ORPWINDOW_EARLY:
+ percpu_priv->ern_cnt.early_window++;
+ break;
+ case QM_MR_RC_ORPWINDOW_LATE:
+ percpu_priv->ern_cnt.late_window++;
+ break;
+ case QM_MR_RC_FQ_TAILDROP:
+ percpu_priv->ern_cnt.fq_tdrop++;
+ break;
+ case QM_MR_RC_ORPWINDOW_RETIRED:
+ percpu_priv->ern_cnt.fq_retired++;
+ break;
+ case QM_MR_RC_ORP_ZERO:
+ percpu_priv->ern_cnt.orp_zero++;
+ break;
+ }
+}
+EXPORT_SYMBOL(count_ern);
+
/**
* Turn on HW checksum computation for this outgoing frame.
* If the current protocol is not something we support in this regard
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
index 53da367..33acacc 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
@@ -121,6 +121,8 @@ void dpaa_eth_init_ports(struct mac_device *mac_dev,
void dpa_release_sgt(struct qm_sg_entry *sgt);
void __attribute__((nonnull))
dpa_fd_release(const struct net_device *net_dev, const struct qm_fd *fd);
+void count_ern(struct dpa_percpu_priv_s *percpu_priv,
+ const struct qm_mr_entry *msg);
int dpa_enable_tx_csum(struct dpa_priv_s *priv,
struct sk_buff *skb,
struct qm_fd *fd,
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c
index 410effd..74f22eb 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c
@@ -656,6 +656,7 @@ int __hot dpa_tx(struct sk_buff *skb, struct net_device *net_dev)
likely(skb_shinfo(skb)->nr_frags < DPA_SGT_MAX_ENTRIES)) {
/* Just create a S/G fd based on the skb */
err = skb_to_sg_fd(priv, skb, &fd);
+ percpu_priv->tx_frag_skbuffs++;
} else {
/* Make sure we have enough headroom to accommodate private
* data, parse results, etc. Normally this shouldn't happen if
--
1.7.11.7


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