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
  69         if (netif_msg_pktdata(Adapter))
  70                 print_hex_dump(KERN_DEBUG, PFX "tx control: ", DUMP_PREFIX_NONE,
  71                                16, 1, pControlPacket, PLeader->PLength + LEADER_SIZE, 0);
  72
  73         Adapter->interface_transmit(Adapter->pvInterfaceAdapter,
  74                                         pControlPacket, (PLeader->PLength + LEADER_SIZE));
  75
  76         atomic_dec(&Adapter->CurrNumFreeTxDesc);
  77         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "<=========");
  78         return STATUS_SUCCESS;
  79 }
  80
  81 /**
  82 @ingroup tx_functions
  83 This function despatches the IP packets with the given vcid
  84 to the target via the host h/w interface.
  85 @return  zero(success) or -ve value(failure)
  86 */
  87 INT SetupNextSend(PMINI_ADAPTER Adapter,  struct sk_buff *Packet, USHORT Vcid)
  88 {
  89         int             status=0;
  90         BOOLEAN bHeaderSupressionEnabled = FALSE;
  91         B_UINT16            uiClassifierRuleID;
  92         u16     QueueIndex = skb_get_queue_mapping(Packet);
  93         LEADER Leader={0};
  94
  95         if(Packet->len > MAX_DEVICE_DESC_SIZE)
  96         {
  97                 status = STATUS_FAILURE;
  98                 goto errExit;
  99         }
 100
 101         /* Get the Classifier Rule ID */
 102         uiClassifierRuleID = *((UINT32*) (Packet->cb)+SKB_CB_CLASSIFICATION_OFFSET);
 103
 104         bHeaderSupressionEnabled = Adapter->PackInfo[QueueIndex].bHeaderSuppressionEnabled
 105                 & Adapter->bPHSEnabled;
 106
 107         if(Adapter->device_removed)
 108                 {
 109                 status = STATUS_FAILURE;
 110                 goto errExit;
 111                 }
 112
 113         status = PHSTransmit(Adapter, &Packet, Vcid, uiClassifierRuleID, bHeaderSupressionEnabled,
 114                                                         (UINT *)&Packet->len, Adapter->PackInfo[QueueIndex].bEthCSSupport);
 115
 116         if(status != STATUS_SUCCESS)
 117         {
 118                 BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "PHS Transmit failed..\n");
 119                 goto errExit;
 120         }
 121
 122         Leader.Vcid     = Vcid;
 123
 124         if(TCP_ACK == *((UINT32*) (Packet->cb) + SKB_CB_TCPACK_OFFSET ))
 125                 Leader.Status = LEADER_STATUS_TCP_ACK;
 126         else
 127                 Leader.Status = LEADER_STATUS;
 128
 129         if(Adapter->PackInfo[QueueIndex].bEthCSSupport)
 130         {
 131                 Leader.PLength = Packet->len;
 132                 if(skb_headroom(Packet) < LEADER_SIZE)
 133         {
 134                         if((status = skb_cow(Packet,LEADER_SIZE)))
 135                         {
 136                                 BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL,"bcm_transmit : Failed To Increase headRoom\n");
 137                                 goto errExit;
 138                         }
 139                 }
 140                 skb_push(Packet, LEADER_SIZE);
 141                 memcpy(Packet->data, &Leader, LEADER_SIZE);
 142         }
 143         else
 144         {
 145                 Leader.PLength = Packet->len - ETH_HLEN;
 146                 memcpy((LEADER*)skb_pull(Packet, (ETH_HLEN - LEADER_SIZE)), &Leader, LEADER_SIZE);
 147         }
 148
 149         status = Adapter->interface_transmit(Adapter->pvInterfaceAdapter,
 150                         Packet->data, (Leader.PLength + LEADER_SIZE));
 151         if(status)
 152         {
 153                 ++Adapter->dev->stats.tx_errors;
 154                 if (netif_msg_tx_err(Adapter))
 155                         pr_info(PFX "%s: transmit error %d\n", Adapter->dev->name,
 156                                 status);
 157         }
 158         else
 159         {
 160                 struct net_device_stats *netstats = &Adapter->dev->stats;
 161                 Adapter->PackInfo[QueueIndex].uiTotalTxBytes += Leader.PLength;
 162
 163                 netstats->tx_bytes += Leader.PLength;
 164                 ++netstats->tx_packets;
 165
 166                 Adapter->PackInfo[QueueIndex].uiCurrentTokenCount -= Leader.PLength << 3;
 167                 Adapter->PackInfo[QueueIndex].uiSentBytes += (Packet->len);
 168                 Adapter->PackInfo[QueueIndex].uiSentPackets++;
 169                 Adapter->PackInfo[QueueIndex].NumOfPacketsSent++;
 170
 171                 atomic_dec(&Adapter->PackInfo[QueueIndex].uiPerSFTxResourceCount);
 172                 Adapter->PackInfo[QueueIndex].uiThisPeriodSentBytes += Leader.PLength;
 173         }
 174
 175         atomic_dec(&Adapter->CurrNumFreeTxDesc);
 176
 177 errExit:
 178
 179         dev_kfree_skb(Packet);
 180         return status;
 181 }
 182
 183 static int tx_pending(PMINI_ADAPTER Adapter)
 184 {
 185         return (atomic_read(&Adapter->TxPktAvail)
 186                 && MINIMUM_PENDING_DESCRIPTORS < atomic_read(&Adapter->CurrNumFreeTxDesc))
 187                 || Adapter->device_removed || (1 == Adapter->downloadDDR);
 188 }
 189
 190 /**
 191 @ingroup tx_functions
 192 Transmit thread
 193 */
 194 int tx_pkt_handler(PMINI_ADAPTER Adapter  /**< pointer to adapter object*/
 195                                 )
 196 {
 197         int status = 0;
 198
 199         while(! kthread_should_stop()) {
 200                 /* FIXME - the timeout looks like workaround for racey usage of TxPktAvail */
 201                 if(Adapter->LinkUpStatus)
 202                         wait_event_timeout(Adapter->tx_packet_wait_queue,
 203                                            tx_pending(Adapter), msecs_to_jiffies(10));
 204                 else
 205                         wait_event_interruptible(Adapter->tx_packet_wait_queue,
 206                                                  tx_pending(Adapter));
 207
 208                 if (Adapter->device_removed)
 209                         break;
 210
 211                 if(Adapter->downloadDDR == 1)
 212                 {
 213                         Adapter->downloadDDR +=1;
 214                         status = download_ddr_settings(Adapter);
 215                         if(status)
 216                                 pr_err(PFX "DDR DOWNLOAD FAILED! %d\n", status);
 217                         continue;
 218                 }
 219
 220                 //Check end point for halt/stall.
 221                 if(Adapter->bEndPointHalted == TRUE)
 222                 {
 223                         Bcm_clear_halt_of_endpoints(Adapter);
 224                         Adapter->bEndPointHalted = FALSE;
 225                         StartInterruptUrb((PS_INTERFACE_ADAPTER)(Adapter->pvInterfaceAdapter));
 226                 }
 227
 228                 if(Adapter->LinkUpStatus && !Adapter->IdleMode)
 229                 {
 230                         if(atomic_read(&Adapter->TotalPacketCount))
 231                         {
 232                                 update_per_sf_desc_cnts(Adapter);
 233                         }
 234                 }
 235
 236                 if( atomic_read(&Adapter->CurrNumFreeTxDesc) &&
 237                         Adapter->LinkStatus == SYNC_UP_REQUEST &&
 238                         !Adapter->bSyncUpRequestSent)
 239                 {
 240                         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Calling LinkMessage");
 241                         LinkMessage(Adapter);
 242                 }
 243
 244                 if((Adapter->IdleMode || Adapter->bShutStatus) && atomic_read(&Adapter->TotalPacketCount))
 245                 {
 246                                 BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Device in Low Power mode...waking up");
 247                         Adapter->usIdleModePattern = ABORT_IDLE_MODE;
 248                                 Adapter->bWakeUpDevice = TRUE;
 249                                 wake_up(&Adapter->process_rx_cntrlpkt);
 250                 }
 251
 252                 transmit_packets(Adapter);
 253
 254                 atomic_set(&Adapter->TxPktAvail, 0);
 255         }
 256
 257         BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Exiting the tx thread..\n");
 258         Adapter->transmit_packet_thread = NULL;
 259         return 0;
 260 }