ibmveth: enable driver for CMO
Enable ibmveth for Cooperative Memory Overcommitment (CMO). For this driver it means calculating a desired amount of IO memory based on the current MTU and updating this value with the bus when MTU changes occur. Because DMA mappings can fail, we have added a bounce buffer for temporary cases where the driver can not map IO memory for the buffer pool. The following changes are made to enable the driver for CMO: * DMA mapping errors will not result in error messages if entitlement has been exceeded and resources were not available. * DMA mapping errors are handled gracefully, ibmveth_replenish_buffer_pool() is corrected to check the return from dma_map_single and fail gracefully. * The driver will have a get_desired_dma function defined to function in a CMO environment. * When the MTU is changed, the driver will update the device IO entitlement Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com> Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Santiago Leon <santil@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Robert Jennings
Benjamin Herrenschmidt
parent
ea866e6526
commit
1096d63d8e
2 changed files with 140 additions and 34 deletions
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@ -33,6 +33,7 @@
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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@ -52,7 +53,9 @@
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#include <asm/hvcall.h>
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#include <asm/atomic.h>
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#include <asm/vio.h>
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#include <asm/iommu.h>
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#include <asm/uaccess.h>
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#include <asm/firmware.h>
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#include <linux/seq_file.h>
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#include "ibmveth.h"
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@ -94,8 +97,10 @@ static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
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static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
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static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
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static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
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static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
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static struct kobj_type ktype_veth_pool;
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#ifdef CONFIG_PROC_FS
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#define IBMVETH_PROC_DIR "ibmveth"
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static struct proc_dir_entry *ibmveth_proc_dir;
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@ -226,16 +231,16 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
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u32 i;
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u32 count = pool->size - atomic_read(&pool->available);
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u32 buffers_added = 0;
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struct sk_buff *skb;
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unsigned int free_index, index;
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u64 correlator;
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unsigned long lpar_rc;
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dma_addr_t dma_addr;
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mb();
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for(i = 0; i < count; ++i) {
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struct sk_buff *skb;
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unsigned int free_index, index;
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u64 correlator;
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union ibmveth_buf_desc desc;
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unsigned long lpar_rc;
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dma_addr_t dma_addr;
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skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
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@ -255,6 +260,9 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
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dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
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pool->buff_size, DMA_FROM_DEVICE);
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if (dma_mapping_error(dma_addr))
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goto failure;
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pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
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pool->dma_addr[index] = dma_addr;
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pool->skbuff[index] = skb;
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@ -267,24 +275,31 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
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lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
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if(lpar_rc != H_SUCCESS) {
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if (lpar_rc != H_SUCCESS)
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goto failure;
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else {
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buffers_added++;
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adapter->replenish_add_buff_success++;
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}
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}
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mb();
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atomic_add(buffers_added, &(pool->available));
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return;
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failure:
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pool->free_map[free_index] = index;
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pool->skbuff[index] = NULL;
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if (pool->consumer_index == 0)
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pool->consumer_index = pool->size - 1;
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else
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pool->consumer_index--;
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if (!dma_mapping_error(dma_addr))
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dma_unmap_single(&adapter->vdev->dev,
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pool->dma_addr[index], pool->buff_size,
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DMA_FROM_DEVICE);
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dev_kfree_skb_any(skb);
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adapter->replenish_add_buff_failure++;
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break;
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} else {
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buffers_added++;
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adapter->replenish_add_buff_success++;
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}
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}
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mb();
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atomic_add(buffers_added, &(pool->available));
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@ -297,7 +312,7 @@ static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
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adapter->replenish_task_cycles++;
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for(i = 0; i < IbmVethNumBufferPools; i++)
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for (i = (IbmVethNumBufferPools - 1); i >= 0; i--)
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if(adapter->rx_buff_pool[i].active)
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ibmveth_replenish_buffer_pool(adapter,
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&adapter->rx_buff_pool[i]);
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@ -472,6 +487,18 @@ static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
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if (adapter->rx_buff_pool[i].active)
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ibmveth_free_buffer_pool(adapter,
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&adapter->rx_buff_pool[i]);
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if (adapter->bounce_buffer != NULL) {
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if (!dma_mapping_error(adapter->bounce_buffer_dma)) {
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dma_unmap_single(&adapter->vdev->dev,
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adapter->bounce_buffer_dma,
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adapter->netdev->mtu + IBMVETH_BUFF_OH,
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DMA_BIDIRECTIONAL);
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adapter->bounce_buffer_dma = DMA_ERROR_CODE;
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}
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kfree(adapter->bounce_buffer);
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adapter->bounce_buffer = NULL;
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}
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}
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static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
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@ -607,6 +634,24 @@ static int ibmveth_open(struct net_device *netdev)
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return rc;
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}
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adapter->bounce_buffer =
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kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
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if (!adapter->bounce_buffer) {
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ibmveth_error_printk("unable to allocate bounce buffer\n");
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ibmveth_cleanup(adapter);
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napi_disable(&adapter->napi);
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return -ENOMEM;
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}
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adapter->bounce_buffer_dma =
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dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
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netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
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if (dma_mapping_error(adapter->bounce_buffer_dma)) {
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ibmveth_error_printk("unable to map bounce buffer\n");
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ibmveth_cleanup(adapter);
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napi_disable(&adapter->napi);
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return -ENOMEM;
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}
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ibmveth_debug_printk("initial replenish cycle\n");
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ibmveth_interrupt(netdev->irq, netdev);
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@ -853,9 +898,11 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
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unsigned int tx_packets = 0;
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unsigned int tx_send_failed = 0;
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unsigned int tx_map_failed = 0;
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int used_bounce = 0;
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unsigned long data_dma_addr;
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desc.fields.flags_len = IBMVETH_BUF_VALID | skb->len;
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desc.fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
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data_dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
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skb->len, DMA_TO_DEVICE);
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if (skb->ip_summed == CHECKSUM_PARTIAL &&
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@ -875,12 +922,16 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
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buf[1] = 0;
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}
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if (dma_mapping_error(desc.fields.address)) {
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if (dma_mapping_error(data_dma_addr)) {
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if (!firmware_has_feature(FW_FEATURE_CMO))
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ibmveth_error_printk("tx: unable to map xmit buffer\n");
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skb_copy_from_linear_data(skb, adapter->bounce_buffer,
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skb->len);
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desc.fields.address = adapter->bounce_buffer_dma;
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tx_map_failed++;
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tx_dropped++;
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goto out;
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}
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used_bounce = 1;
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} else
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desc.fields.address = data_dma_addr;
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/* send the frame. Arbitrarily set retrycount to 1024 */
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correlator = 0;
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@ -904,7 +955,8 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
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netdev->trans_start = jiffies;
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}
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dma_unmap_single(&adapter->vdev->dev, desc.fields.address,
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if (!used_bounce)
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dma_unmap_single(&adapter->vdev->dev, data_dma_addr,
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skb->len, DMA_TO_DEVICE);
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out: spin_lock_irqsave(&adapter->stats_lock, flags);
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@ -1053,8 +1105,9 @@ static void ibmveth_set_multicast_list(struct net_device *netdev)
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static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct ibmveth_adapter *adapter = dev->priv;
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struct vio_dev *viodev = adapter->vdev;
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int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
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int i, rc;
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int i;
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if (new_mtu < IBMVETH_MAX_MTU)
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return -EINVAL;
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@ -1085,10 +1138,15 @@ static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
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ibmveth_close(adapter->netdev);
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adapter->pool_config = 0;
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dev->mtu = new_mtu;
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if ((rc = ibmveth_open(adapter->netdev)))
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return rc;
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} else
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vio_cmo_set_dev_desired(viodev,
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ibmveth_get_desired_dma
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(viodev));
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return ibmveth_open(adapter->netdev);
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}
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dev->mtu = new_mtu;
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vio_cmo_set_dev_desired(viodev,
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ibmveth_get_desired_dma
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(viodev));
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return 0;
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}
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}
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@ -1103,6 +1161,46 @@ static void ibmveth_poll_controller(struct net_device *dev)
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}
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#endif
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/**
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* ibmveth_get_desired_dma - Calculate IO memory desired by the driver
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*
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* @vdev: struct vio_dev for the device whose desired IO mem is to be returned
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*
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* Return value:
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* Number of bytes of IO data the driver will need to perform well.
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*/
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static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
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{
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struct net_device *netdev = dev_get_drvdata(&vdev->dev);
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struct ibmveth_adapter *adapter;
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unsigned long ret;
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int i;
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int rxqentries = 1;
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/* netdev inits at probe time along with the structures we need below*/
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if (netdev == NULL)
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return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
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adapter = netdev_priv(netdev);
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ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
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ret += IOMMU_PAGE_ALIGN(netdev->mtu);
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for (i = 0; i < IbmVethNumBufferPools; i++) {
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/* add the size of the active receive buffers */
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if (adapter->rx_buff_pool[i].active)
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ret +=
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adapter->rx_buff_pool[i].size *
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IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
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buff_size);
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rxqentries += adapter->rx_buff_pool[i].size;
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}
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/* add the size of the receive queue entries */
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ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
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return ret;
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}
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static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
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{
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int rc, i;
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@ -1247,6 +1345,8 @@ static int __devexit ibmveth_remove(struct vio_dev *dev)
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ibmveth_proc_unregister_adapter(adapter);
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free_netdev(netdev);
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dev_set_drvdata(&dev->dev, NULL);
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return 0;
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}
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@ -1491,6 +1591,7 @@ static struct vio_driver ibmveth_driver = {
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.id_table = ibmveth_device_table,
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.probe = ibmveth_probe,
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.remove = ibmveth_remove,
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.get_desired_dma = ibmveth_get_desired_dma,
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.driver = {
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.name = ibmveth_driver_name,
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.owner = THIS_MODULE,
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@ -93,9 +93,12 @@ static inline long h_illan_attributes(unsigned long unit_address,
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plpar_hcall_norets(H_CHANGE_LOGICAL_LAN_MAC, ua, mac)
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#define IbmVethNumBufferPools 5
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#define IBMVETH_IO_ENTITLEMENT_DEFAULT 4243456 /* MTU of 1500 needs 4.2Mb */
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#define IBMVETH_BUFF_OH 22 /* Overhead: 14 ethernet header + 8 opaque handle */
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#define IBMVETH_MAX_MTU 68
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#define IBMVETH_MAX_POOL_COUNT 4096
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#define IBMVETH_BUFF_LIST_SIZE 4096
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#define IBMVETH_FILT_LIST_SIZE 4096
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#define IBMVETH_MAX_BUF_SIZE (1024 * 128)
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static int pool_size[] = { 512, 1024 * 2, 1024 * 16, 1024 * 32, 1024 * 64 };
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@ -143,6 +146,8 @@ struct ibmveth_adapter {
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struct ibmveth_rx_q rx_queue;
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int pool_config;
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int rx_csum;
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void *bounce_buffer;
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dma_addr_t bounce_buffer_dma;
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/* adapter specific stats */
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u64 replenish_task_cycles;
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