drivers/staging/bcm/Transmit.c

   1 /**
   2 @file Transmit.c
   3 @defgroup tx_functions Transmission
   4 @section Queueing
   5 @dot
   6 digraph transmit1 {
   7 node[shape=box]
   8 edge[weight=5;color=red]
   9
  10 bcm_transmit->GetPacketQueueIndex[label="IP Packet"]
  11 GetPacketQueueIndex->IpVersion4[label="IPV4"]
  12 GetPacketQueueIndex->IpVersion6[label="IPV6"]
  13 }
  14
  15 @enddot
  16
  17 @section De-Queueing
  18 @dot
  19 digraph transmit2 {
  20 node[shape=box]
  21 edge[weight=5;color=red]
  22 interrupt_service_thread->transmit_packets
  23 tx_pkt_hdler->transmit_packets
  24 transmit_packets->CheckAndSendPacketFromIndex
  25 transmit_packets->UpdateTokenCount
  26 CheckAndSendPacketFromIndex->PruneQueue
  27 CheckAndSendPacketFromIndex->IsPacketAllowedForFlow
  28 CheckAndSendPacketFromIndex->SendControlPacket[label="control pkt"]
  29 SendControlPacket->bcm_cmd53
  30 CheckAndSendPacketFromIndex->SendPacketFromQueue[label="data pkt"]
  31 SendPacketFromQueue->SetupNextSend->bcm_cmd53
  32 }
  33 @enddot
  34 */
  35
  36 #include "headers.h"
  37
  38
  39 /**
  40 @ingroup ctrl_pkt_functions
  41 This function dispatches control packet to the h/w interface
  42 @return zero(success) or -ve value(failure)
  43 */
  44 INT SendControlPacket(PMINI_ADAPTER Adapter, char *pControlPacket)
  45 {
  46         PLEADER PLeader = (PLEADER)pControlPacket;
  47
  48         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Tx");
  49         if(!pControlPacket || !Adapter)
  50         {
  51                 BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Got NULL Control Packet or Adapter");
  52                 return STATUS_FAILURE;
  53         }
  54         if((atomic_read( &Adapter->CurrNumFreeTxDesc ) <
  55                 ((PLeader->PLength-1)/MAX_DEVICE_DESC_SIZE)+1))
  56     {
  57         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "NO FREE DESCRIPTORS TO SEND CONTROL PACKET");
  58         return STATUS_FAILURE;
  59     }
  60
  61         /* Update the netdevice statistics */
  62         /* Dump Packet  */
  63         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Leader Status: %x", PLeader->Status);
  64         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Leader VCID: %x",PLeader->Vcid);
  65         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Leader Length: %x",PLeader->PLength);
  66         if(Adapter->device_removed)
  67                 return 0;
  68         Adapter->interface_transmit(Adapter->pvInterfaceAdapter,
  69                                         pControlPacket, (PLeader->PLength + LEADER_SIZE));
  70
  71         atomic_dec(&Adapter->CurrNumFreeTxDesc);
  72         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "<=========");
  73         return STATUS_SUCCESS;
  74 }
  75
  76 /**
  77 @ingroup tx_functions
  78 This function despatches the IP packets with the given vcid
  79 to the target via the host h/w interface.
  80 @return  zero(success) or -ve value(failure)
  81 */
  82 INT SetupNextSend(PMINI_ADAPTER Adapter,  struct sk_buff *Packet, USHORT Vcid)
  83 {
  84         int             status=0;
  85         BOOLEAN bHeaderSupressionEnabled = FALSE;
  86         B_UINT16            uiClassifierRuleID;
  87         u16     QueueIndex = skb_get_queue_mapping(Packet);
  88         LEADER Leader={0};
  89
  90         if(Packet->len > MAX_DEVICE_DESC_SIZE)
  91         {
  92                 status = STATUS_FAILURE;
  93                 goto errExit;
  94         }
  95
  96         /* Get the Classifier Rule ID */
  97         uiClassifierRuleID = *((UINT32*) (Packet->cb)+SKB_CB_CLASSIFICATION_OFFSET);
  98
  99         bHeaderSupressionEnabled = Adapter->PackInfo[QueueIndex].bHeaderSuppressionEnabled
 100                 & Adapter->bPHSEnabled;
 101
 102         if(Adapter->device_removed)
 103                 {
 104                 status = STATUS_FAILURE;
 105                 goto errExit;
 106                 }
 107
 108         status = PHSTransmit(Adapter, &Packet, Vcid, uiClassifierRuleID, bHeaderSupressionEnabled,
 109                                                         (UINT *)&Packet->len, Adapter->PackInfo[QueueIndex].bEthCSSupport);
 110
 111         if(status != STATUS_SUCCESS)
 112         {
 113                 BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "PHS Transmit failed..\n");
 114                 goto errExit;
 115         }
 116
 117         Leader.Vcid     = Vcid;
 118
 119         if(TCP_ACK == *((UINT32*) (Packet->cb) + SKB_CB_TCPACK_OFFSET ))
 120                 Leader.Status = LEADER_STATUS_TCP_ACK;
 121         else
 122                 Leader.Status = LEADER_STATUS;
 123
 124         if(Adapter->PackInfo[QueueIndex].bEthCSSupport)
 125         {
 126                 Leader.PLength = Packet->len;
 127                 if(skb_headroom(Packet) < LEADER_SIZE)
 128         {
 129                         if((status = skb_cow(Packet,LEADER_SIZE)))
 130                         {
 131                                 BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL,"bcm_transmit : Failed To Increase headRoom\n");
 132                                 goto errExit;
 133                         }
 134                 }
 135                 skb_push(Packet, LEADER_SIZE);
 136                 memcpy(Packet->data, &Leader, LEADER_SIZE);
 137         }
 138         else
 139         {
 140                 Leader.PLength = Packet->len - ETH_HLEN;
 141                 memcpy((LEADER*)skb_pull(Packet, (ETH_HLEN - LEADER_SIZE)), &Leader, LEADER_SIZE);
 142         }
 143
 144         status = Adapter->interface_transmit(Adapter->pvInterfaceAdapter,
 145                         Packet->data, (Leader.PLength + LEADER_SIZE));
 146         if(status)
 147         {
 148                 ++Adapter->dev->stats.tx_errors;
 149                 if (netif_msg_tx_err(Adapter))
 150                         pr_info(PFX "%s: transmit error %d\n", Adapter->dev->name,
 151                                 status);
 152         }
 153         else
 154         {
 155                 struct netdev_queue *txq = netdev_get_tx_queue(Adapter->dev, QueueIndex);
 156                 Adapter->PackInfo[QueueIndex].uiTotalTxBytes += Leader.PLength;
 157
 158                 txq->tx_bytes += Leader.PLength;
 159                 ++txq->tx_packets;
 160
 161                 Adapter->PackInfo[QueueIndex].uiCurrentTokenCount -= Leader.PLength << 3;
 162                 Adapter->PackInfo[QueueIndex].uiSentBytes += (Packet->len);
 163                 Adapter->PackInfo[QueueIndex].uiSentPackets++;
 164                 Adapter->PackInfo[QueueIndex].NumOfPacketsSent++;
 165
 166                 atomic_dec(&Adapter->PackInfo[QueueIndex].uiPerSFTxResourceCount);
 167                 Adapter->PackInfo[QueueIndex].uiThisPeriodSentBytes += Leader.PLength;
 168         }
 169
 170         atomic_dec(&Adapter->CurrNumFreeTxDesc);
 171
 172 errExit:
 173
 174         dev_kfree_skb(Packet);
 175         return status;
 176 }
 177
 178 static int tx_pending(PMINI_ADAPTER Adapter)
 179 {
 180         return (atomic_read(&Adapter->TxPktAvail)
 181                 && MINIMUM_PENDING_DESCRIPTORS < atomic_read(&Adapter->CurrNumFreeTxDesc))
 182                 || Adapter->device_removed || (1 == Adapter->downloadDDR);
 183 }
 184
 185 /**
 186 @ingroup tx_functions
 187 Transmit thread
 188 */
 189 int tx_pkt_handler(PMINI_ADAPTER Adapter  /**< pointer to adapter object*/
 190                                 )
 191 {
 192         int status = 0;
 193
 194         while(! kthread_should_stop()) {
 195                 /* FIXME - the timeout looks like workaround for racey usage of TxPktAvail */
 196                 if(Adapter->LinkUpStatus)
 197                         wait_event_timeout(Adapter->tx_packet_wait_queue,
 198                                            tx_pending(Adapter), msecs_to_jiffies(10));
 199                 else
 200                         wait_event_interruptible(Adapter->tx_packet_wait_queue,
 201                                                  tx_pending(Adapter));
 202
 203                 if (Adapter->device_removed)
 204                         break;
 205
 206                 if(Adapter->downloadDDR == 1)
 207                 {
 208                         Adapter->downloadDDR +=1;
 209                         status = download_ddr_settings(Adapter);
 210                         if(status)
 211                                 pr_err(PFX "DDR DOWNLOAD FAILED! %d\n", status);
 212                         continue;
 213                 }
 214
 215                 //Check end point for halt/stall.
 216                 if(Adapter->bEndPointHalted == TRUE)
 217                 {
 218                         Bcm_clear_halt_of_endpoints(Adapter);
 219                         Adapter->bEndPointHalted = FALSE;
 220                         StartInterruptUrb((PS_INTERFACE_ADAPTER)(Adapter->pvInterfaceAdapter));
 221                 }
 222
 223                 if(Adapter->LinkUpStatus && !Adapter->IdleMode)
 224                 {
 225                         if(atomic_read(&Adapter->TotalPacketCount))
 226                         {
 227                                 update_per_sf_desc_cnts(Adapter);
 228                         }
 229                 }
 230
 231                 if( atomic_read(&Adapter->CurrNumFreeTxDesc) &&
 232                         Adapter->LinkStatus == SYNC_UP_REQUEST &&
 233                         !Adapter->bSyncUpRequestSent)
 234                 {
 235                         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Calling LinkMessage");
 236                         LinkMessage(Adapter);
 237                 }
 238
 239                 if((Adapter->IdleMode || Adapter->bShutStatus) && atomic_read(&Adapter->TotalPacketCount))
 240                 {
 241                                 BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Device in Low Power mode...waking up");
 242                         Adapter->usIdleModePattern = ABORT_IDLE_MODE;
 243                                 Adapter->bWakeUpDevice = TRUE;
 244                                 wake_up(&Adapter->process_rx_cntrlpkt);
 245                 }
 246
 247                 transmit_packets(Adapter);
 248
 249                 atomic_set(&Adapter->TxPktAvail, 0);
 250         }
 251
 252         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Exiting the tx thread..\n");
 253         Adapter->transmit_packet_thread = NULL;
 254         return 0;
 255 }