S2IO: Checking for the return value of pci map function

 - Checking for the return value of pci map function
 - Implemented Francois Romieu's comments on eliminating code duplication
   using goto
 - Implemented Francois Romieu's comments on using a temporary variable for
   accessing statistics structure

Signed-off-by: Veena Parat <veena.parat@neterion.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 724b443..ce3a6d9 100644 (file)
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -282,6 +282,7 @@ static char ethtool_driver_stats_keys[][ETH_GSTRING_LEN] = {
        ("lro_flush_due_to_max_pkts"),
        ("lro_avg_aggr_pkts"),
        ("mem_alloc_fail_cnt"),
+       ("pci_map_fail_cnt"),
        ("watchdog_timer_cnt"),
        ("mem_allocated"),
        ("mem_freed"),
@@ -2271,6 +2272,7 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
        u64 Buffer0_ptr = 0, Buffer1_ptr = 0;
        struct RxD1 *rxdp1;
        struct RxD3 *rxdp3;
+       struct swStat *stats = &nic->mac_control.stats_info->sw_stat;
 
        mac_control = &nic->mac_control;
        config = &nic->config;
@@ -2360,6 +2362,11 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
                        rxdp1->Buffer0_ptr = pci_map_single
                            (nic->pdev, skb->data, size - NET_IP_ALIGN,
                                PCI_DMA_FROMDEVICE);
+                       if( (rxdp1->Buffer0_ptr == 0) ||
+                               (rxdp1->Buffer0_ptr ==
+                               DMA_ERROR_CODE))
+                               goto pci_map_failed;
+
                        rxdp->Control_2 = 
                                SET_BUFFER0_SIZE_1(size - NET_IP_ALIGN);
 
@@ -2395,6 +2402,10 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
                                pci_dma_sync_single_for_device(nic->pdev,
                                (dma_addr_t) rxdp3->Buffer0_ptr,
                                    BUF0_LEN, PCI_DMA_FROMDEVICE);
+                       if( (rxdp3->Buffer0_ptr == 0) ||
+                               (rxdp3->Buffer0_ptr == DMA_ERROR_CODE))
+                               goto pci_map_failed;
+
                        rxdp->Control_2 = SET_BUFFER0_SIZE_3(BUF0_LEN);
                        if (nic->rxd_mode == RXD_MODE_3B) {
                                /* Two buffer mode */
@@ -2407,12 +2418,22 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
                                (nic->pdev, skb->data, dev->mtu + 4,
                                                PCI_DMA_FROMDEVICE);
 
-                               /* Buffer-1 will be dummy buffer. Not used */
-                               if (!(rxdp3->Buffer1_ptr)) {
-                                       rxdp3->Buffer1_ptr =
+                               if( (rxdp3->Buffer2_ptr == 0) ||
+                                       (rxdp3->Buffer2_ptr == DMA_ERROR_CODE))
+                                       goto pci_map_failed;
+
+                               rxdp3->Buffer1_ptr =
                                                pci_map_single(nic->pdev,
                                                ba->ba_1, BUF1_LEN,
                                                PCI_DMA_FROMDEVICE);
+                               if( (rxdp3->Buffer1_ptr == 0) ||
+                                       (rxdp3->Buffer1_ptr == DMA_ERROR_CODE)) {
+                                       pci_unmap_single
+                                               (nic->pdev,
+                                               (dma_addr_t)skb->data,
+                                               dev->mtu + 4,
+                                               PCI_DMA_FROMDEVICE);
+                                       goto pci_map_failed;
                                }
                                rxdp->Control_2 |= SET_BUFFER1_SIZE_3(1);
                                rxdp->Control_2 |= SET_BUFFER2_SIZE_3
@@ -2451,6 +2472,11 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
        }
 
        return SUCCESS;
+pci_map_failed:
+       stats->pci_map_fail_cnt++;
+       stats->mem_freed += skb->truesize;
+       dev_kfree_skb_irq(skb);
+       return -ENOMEM;
 }
 
 static void free_rxd_blk(struct s2io_nic *sp, int ring_no, int blk)
@@ -3882,6 +3908,7 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev)
        struct mac_info *mac_control;
        struct config_param *config;
        int offload_type;
+       struct swStat *stats = &sp->mac_control.stats_info->sw_stat;
 
        mac_control = &sp->mac_control;
        config = &sp->config;
@@ -3966,11 +3993,18 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev)
                txdp->Buffer_Pointer = pci_map_single(sp->pdev,
                                        sp->ufo_in_band_v,
                                        sizeof(u64), PCI_DMA_TODEVICE);
+               if((txdp->Buffer_Pointer == 0) ||
+                       (txdp->Buffer_Pointer == DMA_ERROR_CODE))
+                       goto pci_map_failed;
                txdp++;
        }
 
        txdp->Buffer_Pointer = pci_map_single
            (sp->pdev, skb->data, frg_len, PCI_DMA_TODEVICE);
+       if((txdp->Buffer_Pointer == 0) ||
+               (txdp->Buffer_Pointer == DMA_ERROR_CODE))
+               goto pci_map_failed;
+
        txdp->Host_Control = (unsigned long) skb;
        txdp->Control_1 |= TXD_BUFFER0_SIZE(frg_len);
        if (offload_type == SKB_GSO_UDP)
@@ -4027,6 +4061,13 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev)
        spin_unlock_irqrestore(&sp->tx_lock, flags);
 
        return 0;
+pci_map_failed:
+       stats->pci_map_fail_cnt++;
+       netif_stop_queue(dev);
+       stats->mem_freed += skb->truesize;
+       dev_kfree_skb(skb);
+       spin_unlock_irqrestore(&sp->tx_lock, flags);
+       return 0;
 }
 
 static void
@@ -5769,6 +5810,7 @@ static void s2io_get_ethtool_stats(struct net_device *dev,
        else
                tmp_stats[i++] = 0;
        tmp_stats[i++] = stat_info->sw_stat.mem_alloc_fail_cnt;
+       tmp_stats[i++] = stat_info->sw_stat.pci_map_fail_cnt;
        tmp_stats[i++] = stat_info->sw_stat.watchdog_timer_cnt;
        tmp_stats[i++] = stat_info->sw_stat.mem_allocated;
        tmp_stats[i++] = stat_info->sw_stat.mem_freed;
@@ -6112,6 +6154,7 @@ static int set_rxd_buffer_pointer(struct s2io_nic *sp, struct RxD_t *rxdp,
                                u64 *temp2, int size)
 {
        struct net_device *dev = sp->dev;
+       struct swStat *stats = &sp->mac_control.stats_info->sw_stat;
 
        if ((sp->rxd_mode == RXD_MODE_1) && (rxdp->Host_Control == 0)) {
                struct RxD1 *rxdp1 = (struct RxD1 *)rxdp;
@@ -6144,6 +6187,10 @@ static int set_rxd_buffer_pointer(struct s2io_nic *sp, struct RxD_t *rxdp,
                                pci_map_single( sp->pdev, (*skb)->data,
                                        size - NET_IP_ALIGN,
                                        PCI_DMA_FROMDEVICE);
+                       if( (rxdp1->Buffer0_ptr == 0) ||
+                               (rxdp1->Buffer0_ptr == DMA_ERROR_CODE)) {
+                               goto memalloc_failed;
+                       }
                        rxdp->Host_Control = (unsigned long) (*skb);
                }
        } else if ((sp->rxd_mode == RXD_MODE_3B) && (rxdp->Host_Control == 0)) {
@@ -6169,19 +6216,43 @@ static int set_rxd_buffer_pointer(struct s2io_nic *sp, struct RxD_t *rxdp,
                                pci_map_single(sp->pdev, (*skb)->data,
                                               dev->mtu + 4,
                                               PCI_DMA_FROMDEVICE);
+                       if( (rxdp3->Buffer2_ptr == 0) ||
+                               (rxdp3->Buffer2_ptr == DMA_ERROR_CODE)) {
+                               goto memalloc_failed;
+                       }
                        rxdp3->Buffer0_ptr = *temp0 =
                                pci_map_single( sp->pdev, ba->ba_0, BUF0_LEN,
                                                PCI_DMA_FROMDEVICE);
+                       if( (rxdp3->Buffer0_ptr == 0) ||
+                               (rxdp3->Buffer0_ptr == DMA_ERROR_CODE)) {
+                               pci_unmap_single (sp->pdev,
+                                       (dma_addr_t)(*skb)->data,
+                                       dev->mtu + 4, PCI_DMA_FROMDEVICE);
+                               goto memalloc_failed;
+                       }
                        rxdp->Host_Control = (unsigned long) (*skb);
 
                        /* Buffer-1 will be dummy buffer not used */
                        rxdp3->Buffer1_ptr = *temp1 =
                                pci_map_single(sp->pdev, ba->ba_1, BUF1_LEN,
                                                PCI_DMA_FROMDEVICE);
+                       if( (rxdp3->Buffer1_ptr == 0) ||
+                               (rxdp3->Buffer1_ptr == DMA_ERROR_CODE)) {
+                               pci_unmap_single (sp->pdev,
+                                       (dma_addr_t)(*skb)->data,
+                                       dev->mtu + 4, PCI_DMA_FROMDEVICE);
+                               goto memalloc_failed;
+                       }
                }
        }
        return 0;
+       memalloc_failed:
+               stats->pci_map_fail_cnt++;
+               stats->mem_freed += (*skb)->truesize;
+               dev_kfree_skb(*skb);
+               return -ENOMEM;
 }
+
 static void set_rxd_buffer_size(struct s2io_nic *sp, struct RxD_t *rxdp,
                                int size)
 {

diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
index aa5428c..92983ee 100644 (file)
--- a/drivers/net/s2io.h
+++ b/drivers/net/s2io.h
@@ -74,6 +74,10 @@ static int debug_level = ERR_DBG;
 /* DEBUG message print. */
 #define DBG_PRINT(dbg_level, args...)  if(!(debug_level<dbg_level)) printk(args)
 
+#ifndef DMA_ERROR_CODE
+#define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
+#endif
+
 /* Protocol assist features of the NIC */
 #define L3_CKSUM_OK 0xFFFF
 #define L4_CKSUM_OK 0xFFFF
@@ -97,6 +101,7 @@ struct swStat {
        unsigned long long num_aggregations;
        /* Other statistics */
        unsigned long long mem_alloc_fail_cnt;
+       unsigned long long pci_map_fail_cnt;
        unsigned long long watchdog_timer_cnt;
        unsigned long long mem_allocated;
        unsigned long long mem_freed;