forked from Minki/linux
[SCSI] fcoe: Use per-CPU kernel function for dev_stats instead of an array
Remove the hotplug creation of dev_stats, we allocate for all possible CPUs now when we allocate the lport. v2: Durring the 2.6.30 merge window, before these patches were comitted, 'percpu_ptr' was renamed 'per_cpu_ptr'. This latest update updates this patch for the name change. Signed-off-by: Yi Zou <yi.zou@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Robert Love
James Bottomley
parent
5e5e92df49
commit
582b45bc57
@ -113,8 +113,6 @@ static struct scsi_host_template fcoe_sw_shost_template = {
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*/
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static int fcoe_sw_lport_config(struct fc_lport *lp)
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{
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int i = 0;
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lp->link_up = 0;
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lp->qfull = 0;
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lp->max_retry_count = 3;
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@ -123,12 +121,7 @@ static int fcoe_sw_lport_config(struct fc_lport *lp)
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lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
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FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
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/*
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* allocate per cpu stats block
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*/
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for_each_online_cpu(i)
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lp->dev_stats[i] = kzalloc(sizeof(struct fcoe_dev_stats),
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GFP_KERNEL);
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fc_lport_init_stats(lp);
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/* lport fc_lport related configuration */
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fc_lport_config(lp);
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@ -311,7 +304,6 @@ static inline int fcoe_sw_em_config(struct fc_lport *lp)
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*/
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static int fcoe_sw_destroy(struct net_device *netdev)
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{
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int cpu;
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struct fc_lport *lp = NULL;
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struct fcoe_softc *fc;
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u8 flogi_maddr[ETH_ALEN];
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@ -363,8 +355,7 @@ static int fcoe_sw_destroy(struct net_device *netdev)
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fcoe_clean_pending_queue(lp);
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/* Free memory used by statistical counters */
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for_each_online_cpu(cpu)
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kfree(lp->dev_stats[cpu]);
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fc_lport_free_stats(lp);
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/* Release the net_device and Scsi_Host */
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dev_put(fc->real_dev);
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@ -71,9 +71,6 @@ DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
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/* Function Prototyes */
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static int fcoe_check_wait_queue(struct fc_lport *);
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static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
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#ifdef CONFIG_HOTPLUG_CPU
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static int fcoe_cpu_callback(struct notifier_block *, ulong, void *);
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#endif /* CONFIG_HOTPLUG_CPU */
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static int fcoe_device_notification(struct notifier_block *, ulong, void *);
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static void fcoe_dev_setup(void);
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static void fcoe_dev_cleanup(void);
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@ -83,87 +80,6 @@ static struct notifier_block fcoe_notifier = {
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.notifier_call = fcoe_device_notification,
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};
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#ifdef CONFIG_HOTPLUG_CPU
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static struct notifier_block fcoe_cpu_notifier = {
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.notifier_call = fcoe_cpu_callback,
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};
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/**
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* fcoe_create_percpu_data() - creates the associated cpu data
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* @cpu: index for the cpu where fcoe cpu data will be created
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*
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* create percpu stats block, from cpu add notifier
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*
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* Returns: none
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*/
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static void fcoe_create_percpu_data(unsigned int cpu)
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{
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struct fc_lport *lp;
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struct fcoe_softc *fc;
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write_lock_bh(&fcoe_hostlist_lock);
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list_for_each_entry(fc, &fcoe_hostlist, list) {
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lp = fc->lp;
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if (lp->dev_stats[cpu] == NULL)
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lp->dev_stats[cpu] =
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kzalloc(sizeof(struct fcoe_dev_stats),
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GFP_KERNEL);
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}
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write_unlock_bh(&fcoe_hostlist_lock);
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}
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/**
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* fcoe_destroy_percpu_data() - destroys the associated cpu data
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* @cpu: index for the cpu where fcoe cpu data will destroyed
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*
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* destroy percpu stats block called by cpu add/remove notifier
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*
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* Retuns: none
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*/
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static void fcoe_destroy_percpu_data(unsigned int cpu)
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{
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struct fc_lport *lp;
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struct fcoe_softc *fc;
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write_lock_bh(&fcoe_hostlist_lock);
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list_for_each_entry(fc, &fcoe_hostlist, list) {
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lp = fc->lp;
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kfree(lp->dev_stats[cpu]);
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lp->dev_stats[cpu] = NULL;
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}
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write_unlock_bh(&fcoe_hostlist_lock);
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}
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/**
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* fcoe_cpu_callback() - fcoe cpu hotplug event callback
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* @nfb: callback data block
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* @action: event triggering the callback
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* @hcpu: index for the cpu of this event
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*
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* this creates or destroys per cpu data for fcoe
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*
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* Returns NOTIFY_OK always.
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*/
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static int fcoe_cpu_callback(struct notifier_block *nfb, unsigned long action,
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void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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switch (action) {
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case CPU_ONLINE:
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fcoe_create_percpu_data(cpu);
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break;
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case CPU_DEAD:
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fcoe_destroy_percpu_data(cpu);
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break;
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default:
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break;
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}
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return NOTIFY_OK;
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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/**
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* fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
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* @skb: the receive skb
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@ -181,7 +97,6 @@ int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
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struct fc_lport *lp;
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struct fcoe_rcv_info *fr;
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struct fcoe_softc *fc;
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struct fcoe_dev_stats *stats;
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struct fc_frame_header *fh;
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struct fcoe_percpu_s *fps;
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unsigned short oxid;
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@ -252,13 +167,7 @@ int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
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return 0;
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err:
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#ifdef CONFIG_SMP
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stats = lp->dev_stats[smp_processor_id()];
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#else
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stats = lp->dev_stats[0];
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#endif
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if (stats)
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stats->ErrorFrames++;
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fc_lport_get_stats(lp)->ErrorFrames++;
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err2:
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kfree_skb(skb);
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@ -495,11 +404,9 @@ int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
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}
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#endif
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/* update tx stats: regardless if LLD fails */
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stats = lp->dev_stats[smp_processor_id()];
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if (stats) {
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stats->TxFrames++;
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stats->TxWords += wlen;
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}
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stats = fc_lport_get_stats(lp);
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stats->TxFrames++;
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stats->TxWords += wlen;
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/* send down to lld */
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fr_dev(fp) = lp;
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@ -565,8 +472,6 @@ int fcoe_percpu_receive_thread(void *arg)
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continue;
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}
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stats = lp->dev_stats[smp_processor_id()];
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if (unlikely(debug_fcoe)) {
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FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
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"tail:%p end:%p sum:%d dev:%s",
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@ -593,13 +498,16 @@ int fcoe_percpu_receive_thread(void *arg)
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hp = (struct fcoe_hdr *) skb_network_header(skb);
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fh = (struct fc_frame_header *) skb_transport_header(skb);
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stats = fc_lport_get_stats(lp);
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if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
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if (stats) {
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if (stats->ErrorFrames < 5)
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FC_DBG("unknown FCoE version %x",
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FC_FCOE_DECAPS_VER(hp));
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stats->ErrorFrames++;
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}
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if (stats->ErrorFrames < 5)
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printk(KERN_WARNING "FCoE version "
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"mismatch: The frame has "
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"version %x, but the "
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"initiator supports version "
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"%x\n", FC_FCOE_DECAPS_VER(hp),
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FC_FCOE_VER);
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stats->ErrorFrames++;
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kfree_skb(skb);
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continue;
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}
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@ -607,10 +515,8 @@ int fcoe_percpu_receive_thread(void *arg)
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skb_pull(skb, sizeof(struct fcoe_hdr));
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fr_len = skb->len - sizeof(struct fcoe_crc_eof);
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if (stats) {
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stats->RxFrames++;
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stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
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}
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stats->RxFrames++;
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stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
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fp = (struct fc_frame *)skb;
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fc_frame_init(fp);
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@ -885,9 +791,8 @@ static int fcoe_device_notification(struct notifier_block *notifier,
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if (new_link_up)
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fc_linkup(lp);
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else {
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stats = lp->dev_stats[smp_processor_id()];
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if (stats)
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stats->LinkFailureCount++;
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stats = fc_lport_get_stats(lp);
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stats->LinkFailureCount++;
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fc_linkdown(lp);
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fcoe_clean_pending_queue(lp);
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}
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@ -1371,10 +1276,6 @@ static int __init fcoe_init(void)
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INIT_LIST_HEAD(&fcoe_hostlist);
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rwlock_init(&fcoe_hostlist_lock);
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#ifdef CONFIG_HOTPLUG_CPU
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register_cpu_notifier(&fcoe_cpu_notifier);
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#endif /* CONFIG_HOTPLUG_CPU */
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for_each_possible_cpu(cpu) {
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p = &per_cpu(fcoe_percpu, cpu);
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skb_queue_head_init(&p->fcoe_rx_list);
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@ -1430,17 +1331,9 @@ static void __exit fcoe_exit(void)
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struct fcoe_percpu_s *p;
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struct sk_buff *skb;
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/*
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* Stop all call back interfaces
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*/
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#ifdef CONFIG_HOTPLUG_CPU
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unregister_cpu_notifier(&fcoe_cpu_notifier);
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#endif /* CONFIG_HOTPLUG_CPU */
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fcoe_dev_cleanup();
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/*
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* stop timer
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*/
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/* Stop the timer */
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del_timer_sync(&fcoe_timer);
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/* releases the associated fcoe transport for each lport */
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@ -407,10 +407,12 @@ static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
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if (~crc != le32_to_cpu(fr_crc(fp))) {
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crc_err:
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stats = lp->dev_stats[smp_processor_id()];
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stats = fc_lport_get_stats(lp);
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stats->ErrorFrames++;
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/* FIXME - per cpu count, not total count! */
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if (stats->InvalidCRCCount++ < 5)
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FC_DBG("CRC error on data frame\n");
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printk(KERN_WARNING "CRC error on data frame for port (%6x)\n",
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fc_host_port_id(lp->host));
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/*
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* Assume the frame is total garbage.
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* We may have copied it over the good part
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@ -1752,7 +1754,7 @@ int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
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/*
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* setup the data direction
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*/
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stats = lp->dev_stats[smp_processor_id()];
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stats = fc_lport_get_stats(lp);
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if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
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fsp->req_flags = FC_SRB_READ;
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stats->InputRequests++;
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@ -267,10 +267,10 @@ EXPORT_SYMBOL(fc_get_host_speed);
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struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
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{
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int i;
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struct fc_host_statistics *fcoe_stats;
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struct fc_lport *lp = shost_priv(shost);
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struct timespec v0, v1;
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unsigned int cpu;
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fcoe_stats = &lp->host_stats;
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memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
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@ -279,10 +279,11 @@ struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
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jiffies_to_timespec(lp->boot_time, &v1);
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fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
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for_each_online_cpu(i) {
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struct fcoe_dev_stats *stats = lp->dev_stats[i];
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if (stats == NULL)
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continue;
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for_each_possible_cpu(cpu) {
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struct fcoe_dev_stats *stats;
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stats = per_cpu_ptr(lp->dev_stats, cpu);
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fcoe_stats->tx_frames += stats->TxFrames;
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fcoe_stats->tx_words += stats->TxWords;
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fcoe_stats->rx_frames += stats->RxFrames;
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@ -22,6 +22,7 @@
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#include <linux/timer.h>
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#include <linux/if.h>
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#include <linux/percpu.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_fc.h>
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@ -661,7 +662,8 @@ struct fc_lport {
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unsigned long boot_time;
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struct fc_host_statistics host_stats;
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struct fcoe_dev_stats *dev_stats[NR_CPUS];
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struct fcoe_dev_stats *dev_stats;
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u64 wwpn;
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u64 wwnn;
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u8 retry_count;
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@ -722,6 +724,25 @@ static inline void fc_lport_state_enter(struct fc_lport *lp,
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lp->state = state;
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}
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static inline int fc_lport_init_stats(struct fc_lport *lp)
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{
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/* allocate per cpu stats block */
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lp->dev_stats = alloc_percpu(struct fcoe_dev_stats);
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if (!lp->dev_stats)
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return -ENOMEM;
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return 0;
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}
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static inline void fc_lport_free_stats(struct fc_lport *lp)
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{
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free_percpu(lp->dev_stats);
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}
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static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp)
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{
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return per_cpu_ptr(lp->dev_stats, smp_processor_id());
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}
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/*
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* LOCAL PORT LAYER
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