From 6a2946baa97337ad17c967ee8ec0bbfef491af30 Mon Sep 17 00:00:00 2001 From: Mithlesh Thukral Date: Mon, 19 Jan 2009 20:24:30 +0530 Subject: [PATCH] Staging: sxg: Locking related changes. Fix locking levels * Fix locking related issues like taking locks at right level. * Convert some variables to atomic, to prevent taking them while incrementing or decrementing them. Signed-off-by: LinSysSoft Sahara Team Signed-off-by: Christopher Harrer Signed-off-by: Greg Kroah-Hartman --- drivers/staging/sxg/sxg.c | 90 +++++++++++++++++++++++------------- drivers/staging/sxg/sxg.h | 5 +- drivers/staging/sxg/sxgdbg.h | 48 +++++++++---------- 3 files changed, 85 insertions(+), 58 deletions(-) diff --git a/drivers/staging/sxg/sxg.c b/drivers/staging/sxg/sxg.c index b8e0e2b7360a..69e1513fa26c 100644 --- a/drivers/staging/sxg/sxg.c +++ b/drivers/staging/sxg/sxg.c @@ -108,10 +108,7 @@ static void sxg_process_rcv_error(struct adapter_t *adapter, u32 ErrorStatus); static bool sxg_mac_filter(struct adapter_t *adapter, struct ether_header *EtherHdr, ushort length); -#if SLIC_GET_STATS_ENABLED -static struct net_device_stats *sxg_get_stats(struct net_device *dev); -#endif - +static struct net_device_stats *sxg_get_stats(struct net_device * dev); void sxg_free_resources(struct adapter_t *adapter); void sxg_free_rcvblocks(struct adapter_t *adapter); void sxg_free_sgl_buffers(struct adapter_t *adapter); @@ -456,6 +453,7 @@ static int sxg_allocate_resources(struct adapter_t *adapter) spin_lock_init(&adapter->XmtZeroLock); spin_lock_init(&adapter->Bit64RegLock); spin_lock_init(&adapter->AdapterLock); + atomic_set(&adapter->pending_allocations, 0); DBG_ERROR("%s Setup the lists\n", __func__); @@ -928,10 +926,8 @@ static int sxg_entry_probe(struct pci_dev *pcidev, netdev->do_ioctl = sxg_ioctl; #if XXXTODO netdev->set_mac_address = sxg_mac_set_address; -#if SLIC_GET_STATS_ENABLED - netdev->get_stats = sxg_get_stats; -#endif #endif + netdev->get_stats = sxg_get_stats; netdev->set_multicast_list = sxg_mcast_set_list; SET_ETHTOOL_OPS(netdev, &sxg_nic_ethtool_ops); @@ -1044,8 +1040,9 @@ static irqreturn_t sxg_isr(int irq, void *dev_id) { struct net_device *dev = (struct net_device *) dev_id; struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev); - /* u32 CpuMask = 0, i; */ + if(adapter->state != ADAPT_UP) + return IRQ_NONE; adapter->Stats.NumInts++; if (adapter->Isr[0] == 0) { /* @@ -1191,6 +1188,7 @@ static int sxg_process_isr(struct adapter_t *adapter, u32 MessageId) * complicated than strictly needed. */ adapter->Stats.RcvNoBuffer++; + adapter->stats.rx_missed_errors++; if (adapter->Stats.RcvNoBuffer < 5) { DBG_ERROR("%s: SXG_ISR_ERR RMISS!!\n", __func__); @@ -1968,9 +1966,8 @@ static void __devexit sxg_entry_remove(struct pci_dev *pcidev) u32 mmio_start = 0; unsigned int mmio_len = 0; struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev); -/* - set_bit(ADAPT_DOWN, &adapter->state); -*/ flush_scheduled_work(); + + flush_scheduled_work(); /* Deallocate Resources */ unregister_netdev(dev); @@ -2247,7 +2244,9 @@ static int sxg_dumb_sgl(struct sxg_x64_sgl *pSgl, XmtCmd, XmtRingInfo->Head, XmtRingInfo->Tail, 0); /* Update stats */ adapter->Stats.DumbXmtPkts++; + adapter->stats.tx_packets++; adapter->Stats.DumbXmtBytes += DataLength; + adapter->stats.tx_bytes += DataLength; #if XXXTODO /* Stats stuff */ if (SXG_MULTICAST_PACKET(EtherHdr)) { if (SXG_BROADCAST_PACKET(EtherHdr)) { @@ -2306,6 +2305,7 @@ static int sxg_dumb_sgl(struct sxg_x64_sgl *pSgl, * XmtZeroLock is grabbed */ adapter->Stats.XmtErrors++; + adapter->stats.tx_errors++; SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_IMPORTANT, "DumSGFal", pSgl, SxgSgl, XmtRingInfo->Head, XmtRingInfo->Tail); /* SxgSgl->DumbPacket is the skb */ @@ -2730,10 +2730,11 @@ static void sxg_link_state(struct adapter_t *adapter, * Hold the adapter lock during this routine. Maybe move * the lock to the caller. */ - spin_lock(&adapter->AdapterLock); + /* IMP TODO : Check if we can survive without taking this lock */ +// spin_lock(&adapter->AdapterLock); if (LinkState == adapter->LinkState) { /* Nothing changed.. */ - spin_unlock(&adapter->AdapterLock); +// spin_unlock(&adapter->AdapterLock); DBG_ERROR("EXIT #0 %s. Link status = %d\n", __func__, LinkState); return; @@ -2742,7 +2743,7 @@ static void sxg_link_state(struct adapter_t *adapter, adapter->LinkState = LinkState; /* Drop the lock and indicate link state */ - spin_unlock(&adapter->AdapterLock); +// spin_unlock(&adapter->AdapterLock); DBG_ERROR("EXIT #1 %s\n", __func__); sxg_indicate_link_state(adapter, LinkState); @@ -3121,9 +3122,9 @@ void sxg_free_sgl_buffers(struct adapter_t *adapter) struct sxg_scatter_gather *Sgl; while(!(IsListEmpty(&adapter->AllSglBuffers))) { - ple = RemoveHeadList(&adapter->AllSglBuffers); - Sgl = container_of(ple, struct sxg_scatter_gather, AllList); - kfree(Sgl); + ple = RemoveHeadList(&adapter->AllSglBuffers); + Sgl = container_of(ple, struct sxg_scatter_gather, AllList); + kfree(Sgl); adapter->AllSglBufferCount--; } } @@ -3204,6 +3205,7 @@ void sxg_free_resources(struct adapter_t *adapter) { u32 RssIds, IsrCount; u32 i; + struct net_device *netdev = adapter->netdev; RssIds = SXG_RSS_CPU_COUNT(adapter); IsrCount = adapter->MsiEnabled ? RssIds : 1; @@ -3215,6 +3217,10 @@ void sxg_free_resources(struct adapter_t *adapter) return; } + /* Free Irq */ + free_irq(adapter->netdev->irq, netdev); + + if (!(IsListEmpty(&adapter->AllRcvBlocks))) { sxg_free_rcvblocks(adapter); } @@ -3294,8 +3300,8 @@ static void sxg_allocate_complete(struct adapter_t *adapter, { SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AllocCmp", adapter, VirtualAddress, Length, Context); - ASSERT(adapter->AllocationsPending); - --adapter->AllocationsPending; + ASSERT(atomic_read(&adapter->pending_allocations)); + atomic_dec(&adapter->pending_allocations); switch (Context) { @@ -3340,14 +3346,8 @@ static int sxg_allocate_buffer_memory(struct adapter_t *adapter, * than INITIALIZING or RUNNING state, fail. This is to prevent * allocations in an improper driver state */ - spin_lock(&adapter->AdapterLock); - /* - * Increment the AllocationsPending count while holding - * the lock. Pause processing relies on this - */ - ++adapter->AllocationsPending; - spin_unlock(&adapter->AdapterLock); + atomic_inc(&adapter->pending_allocations); if(BufferType != SXG_BUFFER_TYPE_SGL) Buffer = pci_alloc_consistent(adapter->pcidev, Size, &pBuffer); @@ -3356,13 +3356,11 @@ static int sxg_allocate_buffer_memory(struct adapter_t *adapter, pBuffer = NULL; } if (Buffer == NULL) { - spin_lock(&adapter->AdapterLock); /* * Decrement the AllocationsPending count while holding * the lock. Pause processing relies on this */ - --adapter->AllocationsPending; - spin_unlock(&adapter->AdapterLock); + atomic_dec(&adapter->pending_allocations); SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AlcMemF1", adapter, Size, BufferType, 0); return (STATUS_RESOURCES); @@ -3514,9 +3512,9 @@ static void sxg_allocate_sgl_buffer_complete(struct adapter_t *adapter, SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AlSglCmp", adapter, SxgSgl, Length, 0); if(!in_irq()) - spin_unlock_irqrestore(&adapter->SglQLock, sgl_flags); + spin_lock_irqsave(&adapter->SglQLock, sgl_flags); else - spin_unlock(&adapter->SglQLock); + spin_lock(&adapter->SglQLock); adapter->AllSglBufferCount++; /* PhysicalAddress; */ SxgSgl->PhysicalAddress = PhysicalAddress; @@ -3549,6 +3547,21 @@ static void sxg_adapter_set_hwaddr(struct adapter_t *adapter) /* sxg_dbg_macaddrs(adapter); */ + struct net_device * dev = adapter->netdev; + if(!dev) + { + printk("sxg: Dev is Null\n"); + } + + DBG_ERROR("%s ENTER (%s)\n", __FUNCTION__, adapter->netdev->name); + + if (netif_running(dev)) { + return -EBUSY; + } + if (!adapter) { + return -EBUSY; + } + if (!(adapter->currmacaddr[0] || adapter->currmacaddr[1] || adapter->currmacaddr[2] || @@ -3749,7 +3762,7 @@ static int sxg_fill_descriptor_block(struct adapter_t *adapter, for (i = 0; i < SXG_RCV_DESCRIPTORS_PER_BLOCK; i++) { SXG_GET_RCV_DATA_BUFFER(adapter, RcvDataBufferHdr); ASSERT(RcvDataBufferHdr); - ASSERT(RcvDataBufferHdr->SxgDumbRcvPacket); +// ASSERT(RcvDataBufferHdr->SxgDumbRcvPacket); if (!RcvDataBufferHdr->SxgDumbRcvPacket) { SXG_ALLOCATE_RCV_PACKET(adapter, RcvDataBufferHdr, adapter->ReceiveBufferSize); @@ -3815,7 +3828,7 @@ static void sxg_stock_rcv_buffers(struct adapter_t *adapter) */ if ((adapter->FreeRcvBufferCount < SXG_MIN_RCV_DATA_BUFFERS) && (adapter->AllRcvBlockCount < SXG_MAX_RCV_BLOCKS) && - (adapter->AllocationsPending == 0)) { + (atomic_read(&adapter->pending_allocations) == 0)) { sxg_allocate_buffer_memory(adapter, SXG_RCV_BLOCK_SIZE (SXG_RCV_DATA_HDR_SIZE), @@ -3921,6 +3934,17 @@ void sxg_collect_statistics(struct adapter_t *adapter) { if(adapter->ucode_stats) WRITE_REG64(adapter, adapter->UcodeRegs[0].GetUcodeStats, adapter->pucode_stats, 0); + adapter->stats.rx_fifo_errors = adapter->ucode_stats->ERDrops; + adapter->stats.rx_over_errors = adapter->ucode_stats->NBDrops; + adapter->stats.tx_fifo_errors = adapter->ucode_stats->XDrops; +} + +static struct net_device_stats *sxg_get_stats(struct net_device * dev) +{ + struct adapter_t *adapter = netdev_priv(dev); + + sxg_collect_statistics(adapter); + return (&adapter->stats); } static struct pci_driver sxg_driver = { diff --git a/drivers/staging/sxg/sxg.h b/drivers/staging/sxg/sxg.h index 2d0ad1977ccc..4d983414b5fd 100644 --- a/drivers/staging/sxg/sxg.h +++ b/drivers/staging/sxg/sxg.h @@ -290,7 +290,7 @@ struct sxg_stats { struct list_entry *_ple; \ if ((_pAdapt->FreeSglBufferCount < SXG_MIN_SGL_BUFFERS) && \ (_pAdapt->AllSglBufferCount < SXG_MAX_SGL_BUFFERS) && \ - (_pAdapt->AllocationsPending == 0)) { \ + (atomic_read(&_pAdapt->pending_allocations) == 0)) { \ sxg_allocate_buffer_memory(_pAdapt, \ (sizeof(struct sxg_scatter_gather) + SXG_SGL_BUF_SIZE),\ SXG_BUFFER_TYPE_SGL); \ @@ -670,6 +670,9 @@ struct adapter_t { ushort FreeRcvBlockCount; /* # of free rcv descriptor blocks */ ushort AllRcvBlockCount; /* Number of total receive blocks */ ushort ReceiveBufferSize; /* SXG_RCV_DATA/JUMBO_BUFFER_SIZE only */ + /* Converted this to a atomic variable + u32 AllocationsPending; */ + atomic_t pending_allocations; u32 AllocationsPending; /* Receive allocation pending */ u32 RcvBuffersOnCard; /* SXG_DATA_BUFFERS owned by card */ /* SGL buffers */ diff --git a/drivers/staging/sxg/sxgdbg.h b/drivers/staging/sxg/sxgdbg.h index 3f7895c083d4..f165fb1e4c98 100644 --- a/drivers/staging/sxg/sxgdbg.h +++ b/drivers/staging/sxg/sxgdbg.h @@ -150,30 +150,30 @@ struct sxg_trace_buffer { unsigned int trace_len; \ struct trace_entry *trace_entry; \ struct timeval timev; \ - \ - spin_lock(&(buffer)->lock); \ - trace_entry = &(buffer)->entries[(buffer)->in]; \ - do_gettimeofday(&timev); \ - \ - memset(trace_entry->name, 0, 8); \ - trace_len = strlen(tname); \ - trace_len = trace_len > 8 ? 8 : trace_len; \ - memcpy(trace_entry->name, (tname), trace_len); \ - trace_entry->time = timev.tv_usec; \ - trace_entry->cpu = (unsigned char)(smp_processor_id() & 0xFF);\ - trace_entry->driver = (tdriver); \ - trace_entry->irql = trace_irql; \ - trace_entry->arg1 = (ulong)(a1); \ - trace_entry->arg2 = (ulong)(a2); \ - trace_entry->arg3 = (ulong)(a3); \ - trace_entry->arg4 = (ulong)(a4); \ - \ - (buffer)->in++; \ - if ((buffer)->in == TRACE_ENTRIES) \ - (buffer)->in = 0; \ - \ - spin_unlock(&(buffer)->lock); \ - } \ + if(spin_trylock(&(buffer)->lock)) { \ + trace_entry = &(buffer)->entries[(buffer)->in]; \ + do_gettimeofday(&timev); \ + \ + memset(trace_entry->name, 0, 8); \ + trace_len = strlen(tname); \ + trace_len = trace_len > 8 ? 8 : trace_len; \ + memcpy(trace_entry->name, (tname), trace_len); \ + trace_entry->time = timev.tv_usec; \ + trace_entry->cpu = (unsigned char)(smp_processor_id() & 0xFF);\ + trace_entry->driver = (tdriver); \ + trace_entry->irql = trace_irql; \ + trace_entry->arg1 = (ulong)(a1); \ + trace_entry->arg2 = (ulong)(a2); \ + trace_entry->arg3 = (ulong)(a3); \ + trace_entry->arg4 = (ulong)(a4); \ + \ + (buffer)->in++; \ + if ((buffer)->in == TRACE_ENTRIES) \ + (buffer)->in = 0; \ + \ + spin_unlock(&(buffer)->lock); \ + } \ + } \ } #else #define SXG_TRACE(tdriver, buffer, tlevel, tname, a1, a2, a3, a4) -- 2.39.5