[PATCH] chelsio: statistics improvement

Cleanup statistics management:
 * Get rid of duplicate or unused statistics
 * Convert high volume stats to per-cpu and 64 bit

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 50 insertions, 15 deletions

diff --git a/drivers/net/chelsio/sge.c b/drivers/net/chelsio/sge.c
index 26df2049d849..9911048d8213 100644
--- a/drivers/net/chelsio/sge.c
+++ b/drivers/net/chelsio/sge.c
@@ -274,7 +274,7 @@ struct sge {
         struct sk_buff  *espibug_skb[MAX_NPORTS];
         u32             sge_control;    /* shadow value of sge control reg */
         struct sge_intr_counts stats;
-        struct sge_port_stats port_stats[MAX_NPORTS];
+        struct sge_port_stats *port_stats[MAX_NPORTS];
         struct sched    *tx_sched;
         struct cmdQ cmdQ[SGE_CMDQ_N] ____cacheline_aligned_in_smp;
 };
@@ -820,6 +820,11 @@ static inline unsigned int jumbo_payload_capacity(const struct sge *sge)
  */
 void t1_sge_destroy(struct sge *sge)
 {
+        int i;
+
+        for_each_port(sge->adapter, i)
+                free_percpu(sge->port_stats[i]);
+
         kfree(sge->tx_sched);
         free_tx_resources(sge);
         free_rx_resources(sge);
@@ -985,14 +990,28 @@ int t1_sge_intr_error_handler(struct sge *sge)
         return 0;
 }
 
-const struct sge_intr_counts *t1_sge_get_intr_counts(struct sge *sge)
+const struct sge_intr_counts *t1_sge_get_intr_counts(const struct sge *sge)
 {
         return &sge->stats;
 }
 
-const struct sge_port_stats *t1_sge_get_port_stats(struct sge *sge, int port)
+void t1_sge_get_port_stats(const struct sge *sge, int port,
+                           struct sge_port_stats *ss)
 {
-        return &sge->port_stats[port];
+        int cpu;
+
+        memset(ss, 0, sizeof(*ss));
+        for_each_possible_cpu(cpu) {
+                struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[port], cpu);
+
+                ss->rx_packets += st->rx_packets;
+                ss->rx_cso_good += st->rx_cso_good;
+                ss->tx_packets += st->tx_packets;
+                ss->tx_cso += st->tx_cso;
+                ss->tx_tso += st->tx_tso;
+                ss->vlan_xtract += st->vlan_xtract;
+                ss->vlan_insert += st->vlan_insert;
+        }
 }
 
 /**
@@ -1361,36 +1380,39 @@ static int sge_rx(struct sge *sge, struct freelQ *fl, unsigned int len)
         struct sk_buff *skb;
         struct cpl_rx_pkt *p;
         struct adapter *adapter = sge->adapter;
+        struct sge_port_stats *st;
 
-        sge->stats.ethernet_pkts++;
         skb = get_packet(adapter->pdev, fl, len - sge->rx_pkt_pad,
                          sge->rx_pkt_pad, 2, SGE_RX_COPY_THRES,
                          SGE_RX_DROP_THRES);
-        if (!skb) {
-                sge->port_stats[0].rx_drops++; /* charge only port 0 for now */
+        if (unlikely(!skb)) {
+                sge->stats.rx_drops++;
                 return 0;
         }
 
         p = (struct cpl_rx_pkt *)skb->data;
         skb_pull(skb, sizeof(*p));
-        skb->dev = adapter->port[p->iff].dev;
         if (p->iff >= adapter->params.nports) {
                 kfree_skb(skb);
                 return 0;
         }
 
+        skb->dev = adapter->port[p->iff].dev;
         skb->dev->last_rx = jiffies;
+        st = per_cpu_ptr(sge->port_stats[p->iff], smp_processor_id());
+        st->rx_packets++;
+
         skb->protocol = eth_type_trans(skb, skb->dev);
         if ((adapter->flags & RX_CSUM_ENABLED) && p->csum == 0xffff &&
             skb->protocol == htons(ETH_P_IP) &&
             (skb->data[9] == IPPROTO_TCP || skb->data[9] == IPPROTO_UDP)) {
-                sge->port_stats[p->iff].rx_cso_good++;
+                ++st->rx_cso_good;
                 skb->ip_summed = CHECKSUM_UNNECESSARY;
         } else
                 skb->ip_summed = CHECKSUM_NONE;
 
         if (unlikely(adapter->vlan_grp && p->vlan_valid)) {
-                sge->port_stats[p->iff].vlan_xtract++;
+                st->vlan_xtract++;
                 if (adapter->params.sge.polling)
                         vlan_hwaccel_receive_skb(skb, adapter->vlan_grp,
                                                  ntohs(p->vlan));
@@ -1862,8 +1884,8 @@ static inline int eth_hdr_len(const void *data)
 int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
         struct adapter *adapter = dev->priv;
-        struct sge_port_stats *st = &adapter->sge->port_stats[dev->if_port];
         struct sge *sge = adapter->sge;
+        struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[dev->if_port], smp_processor_id());
         struct cpl_tx_pkt *cpl;
 
         if (skb->protocol == htons(ETH_P_CPL5))
@@ -1873,7 +1895,7 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 int eth_type;
                 struct cpl_tx_pkt_lso *hdr;
 
-                st->tso++;
+                ++st->tx_tso;
 
                 eth_type = skb->nh.raw - skb->data == ETH_HLEN ?
                         CPL_ETH_II : CPL_ETH_II_VLAN;
@@ -1887,7 +1909,6 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
                                                           skb_shinfo(skb)->gso_size));
                 hdr->len = htonl(skb->len - sizeof(*hdr));
                 cpl = (struct cpl_tx_pkt *)hdr;
-                sge->stats.tx_lso_pkts++;
         } else {
                 /*
                  * Packets shorter than ETH_HLEN can break the MAC, drop them
@@ -1955,8 +1976,6 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 /* the length field isn't used so don't bother setting it */
 
                 st->tx_cso += (skb->ip_summed == CHECKSUM_PARTIAL);
-                sge->stats.tx_do_cksum += (skb->ip_summed == CHECKSUM_PARTIAL);
-                sge->stats.tx_reg_pkts++;
         }
         cpl->iff = dev->if_port;
 
@@ -1970,6 +1989,7 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 cpl->vlan_valid = 0;
 
 send:
+        st->tx_packets++;
         dev->trans_start = jiffies;
         return t1_sge_tx(skb, adapter, 0, dev);
 }
@@ -2151,6 +2171,7 @@ struct sge * __devinit t1_sge_create(struct adapter *adapter,
                                      struct sge_params *p)
 {
         struct sge *sge = kzalloc(sizeof(*sge), GFP_KERNEL);
+        int i;
 
         if (!sge)
                 return NULL;
@@ -2160,6 +2181,12 @@ struct sge * __devinit t1_sge_create(struct adapter *adapter,
         sge->rx_pkt_pad = t1_is_T1B(adapter) ? 0 : 2;
         sge->jumbo_fl = t1_is_T1B(adapter) ? 1 : 0;
 
+        for_each_port(adapter, i) {
+                sge->port_stats[i] = alloc_percpu(struct sge_port_stats);
+                if (!sge->port_stats[i])
+                        goto nomem_port;
+        }
+
         init_timer(&sge->tx_reclaim_timer);
         sge->tx_reclaim_timer.data = (unsigned long)sge;
         sge->tx_reclaim_timer.function = sge_tx_reclaim_cb;
@@ -2199,4 +2226,12 @@ struct sge * __devinit t1_sge_create(struct adapter *adapter,
         p->polling = 0;
 
         return sge;
+nomem_port:
+        while (i >= 0) {
+                free_percpu(sge->port_stats[i]);
+                --i;
+        }
+        kfree(sge);
+        return NULL;
+
 }