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  * @ingroup ctrl_pkt_functions
  40  * This function dispatches control packet to the h/w interface
  41  * @return zero(success) or -ve value(failure)
  42  */
  43 int SendControlPacket(struct bcm_mini_adapter *Adapter, char *pControlPacket)
  44 {
  45         struct bcm_leader *PLeader = (struct bcm_leader *)pControlPacket;
  46
  47         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Tx");
  48         if (!pControlPacket || !Adapter) {
  49                 BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Got NULL Control Packet or Adapter");
  50                 return STATUS_FAILURE;
  51         }
  52         if ((atomic_read(&Adapter->CurrNumFreeTxDesc) <
  53                         ((PLeader->PLength-1)/MAX_DEVICE_DESC_SIZE)+1)) {
  54                 BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "NO FREE DESCRIPTORS TO SEND CONTROL PACKET");
  55                 return STATUS_FAILURE;
  56         }
  57
  58         /* Update the netdevice statistics */
  59         /* Dump Packet  */
  60         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Leader Status: %x", PLeader->Status);
  61         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Leader VCID: %x", PLeader->Vcid);
  62         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "Leader Length: %x", PLeader->PLength);
  63         if (Adapter->device_removed)
  64                 return 0;
  65
  66         if (netif_msg_pktdata(Adapter))
  67                 print_hex_dump(KERN_DEBUG, PFX "tx control: ", DUMP_PREFIX_NONE,
  68                         16, 1, pControlPacket, PLeader->PLength + LEADER_SIZE, 0);
  69
  70         Adapter->interface_transmit(Adapter->pvInterfaceAdapter,
  71                                 pControlPacket, (PLeader->PLength + LEADER_SIZE));
  72
  73         atomic_dec(&Adapter->CurrNumFreeTxDesc);
  74         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_CONTROL, DBG_LVL_ALL, "<=========");
  75         return STATUS_SUCCESS;
  76 }
  77
  78 /**
  79  * @ingroup tx_functions
  80  * This function despatches the IP packets with the given vcid
  81  * to the target via the host h/w interface.
  82  * @return  zero(success) or -ve value(failure)
  83  */
  84 int SetupNextSend(struct bcm_mini_adapter *Adapter,  struct sk_buff *Packet, USHORT Vcid)
  85 {
  86         int     status = 0;
  87         BOOLEAN bHeaderSupressionEnabled = FALSE;
  88         B_UINT16 uiClassifierRuleID;
  89         u16     QueueIndex = skb_get_queue_mapping(Packet);
  90         struct bcm_leader Leader = {0};
  91
  92         if (Packet->len > MAX_DEVICE_DESC_SIZE) {
  93                 status = STATUS_FAILURE;
  94                 goto errExit;
  95         }
  96
  97         /* Get the Classifier Rule ID */
  98         uiClassifierRuleID = *((UINT32 *) (Packet->cb) + SKB_CB_CLASSIFICATION_OFFSET);
  99
 100         bHeaderSupressionEnabled = Adapter->PackInfo[QueueIndex].bHeaderSuppressionEnabled
 101                 & Adapter->bPHSEnabled;
 102
 103         if (Adapter->device_removed) {
 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                 BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "PHS Transmit failed..\n");
 113                 goto errExit;
 114         }
 115
 116         Leader.Vcid = Vcid;
 117
 118         if (TCP_ACK == *((UINT32 *) (Packet->cb) + SKB_CB_TCPACK_OFFSET))
 119                 Leader.Status = LEADER_STATUS_TCP_ACK;
 120         else
 121                 Leader.Status = LEADER_STATUS;
 122
 123         if (Adapter->PackInfo[QueueIndex].bEthCSSupport) {
 124                 Leader.PLength = Packet->len;
 125                 if (skb_headroom(Packet) < LEADER_SIZE) {
 126                         status = skb_cow(Packet, LEADER_SIZE);
 127                         if (status) {
 128                                 BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "bcm_transmit : Failed To Increase headRoom\n");
 129                                 goto errExit;
 130                         }
 131                 }
 132                 skb_push(Packet, LEADER_SIZE);
 133                 memcpy(Packet->data, &Leader, LEADER_SIZE);
 134         } else {
 135                 Leader.PLength = Packet->len - ETH_HLEN;
 136                 memcpy((struct bcm_leader *)skb_pull(Packet, (ETH_HLEN - LEADER_SIZE)), &Leader, LEADER_SIZE);
 137         }
 138
 139         status = Adapter->interface_transmit(Adapter->pvInterfaceAdapter,
 140                                         Packet->data, (Leader.PLength + LEADER_SIZE));
 141         if (status) {
 142                 ++Adapter->dev->stats.tx_errors;
 143                 if (netif_msg_tx_err(Adapter))
 144                         pr_info(PFX "%s: transmit error %d\n", Adapter->dev->name,
 145                                 status);
 146         } else {
 147                 struct net_device_stats *netstats = &Adapter->dev->stats;
 148                 Adapter->PackInfo[QueueIndex].uiTotalTxBytes += Leader.PLength;
 149
 150                 netstats->tx_bytes += Leader.PLength;
 151                 ++netstats->tx_packets;
 152
 153                 Adapter->PackInfo[QueueIndex].uiCurrentTokenCount -= Leader.PLength << 3;
 154                 Adapter->PackInfo[QueueIndex].uiSentBytes += (Packet->len);
 155                 Adapter->PackInfo[QueueIndex].uiSentPackets++;
 156                 Adapter->PackInfo[QueueIndex].NumOfPacketsSent++;
 157
 158                 atomic_dec(&Adapter->PackInfo[QueueIndex].uiPerSFTxResourceCount);
 159                 Adapter->PackInfo[QueueIndex].uiThisPeriodSentBytes += Leader.PLength;
 160         }
 161
 162         atomic_dec(&Adapter->CurrNumFreeTxDesc);
 163
 164 errExit:
 165         dev_kfree_skb(Packet);
 166         return status;
 167 }
 168
 169 static int tx_pending(struct bcm_mini_adapter *Adapter)
 170 {
 171         return (atomic_read(&Adapter->TxPktAvail)
 172                 && MINIMUM_PENDING_DESCRIPTORS < atomic_read(&Adapter->CurrNumFreeTxDesc))
 173                 || Adapter->device_removed || (1 == Adapter->downloadDDR);
 174 }
 175
 176 /**
 177  * @ingroup tx_functions
 178  * Transmit thread
 179  */
 180 int tx_pkt_handler(struct bcm_mini_adapter *Adapter /**< pointer to adapter object*/)
 181 {
 182         int status = 0;
 183
 184         while (!kthread_should_stop()) {
 185                 /* FIXME - the timeout looks like workaround for racey usage of TxPktAvail */
 186                 if (Adapter->LinkUpStatus)
 187                         wait_event_timeout(Adapter->tx_packet_wait_queue,
 188                                         tx_pending(Adapter), msecs_to_jiffies(10));
 189                 else
 190                         wait_event_interruptible(Adapter->tx_packet_wait_queue,
 191                                                 tx_pending(Adapter));
 192
 193                 if (Adapter->device_removed)
 194                         break;
 195
 196                 if (Adapter->downloadDDR == 1) {
 197                         Adapter->downloadDDR += 1;
 198                         status = download_ddr_settings(Adapter);
 199                         if (status)
 200                                 pr_err(PFX "DDR DOWNLOAD FAILED! %d\n", status);
 201                         continue;
 202                 }
 203
 204                 /* Check end point for halt/stall. */
 205                 if (Adapter->bEndPointHalted == TRUE) {
 206                         Bcm_clear_halt_of_endpoints(Adapter);
 207                         Adapter->bEndPointHalted = FALSE;
 208                         StartInterruptUrb((struct bcm_interface_adapter *)(Adapter->pvInterfaceAdapter));
 209                 }
 210
 211                 if (Adapter->LinkUpStatus && !Adapter->IdleMode) {
 212                         if (atomic_read(&Adapter->TotalPacketCount))
 213                                 update_per_sf_desc_cnts(Adapter);
 214                 }
 215
 216                 if (atomic_read(&Adapter->CurrNumFreeTxDesc) &&
 217                         Adapter->LinkStatus == SYNC_UP_REQUEST &&
 218                         !Adapter->bSyncUpRequestSent) {
 219
 220                         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Calling LinkMessage");
 221                         LinkMessage(Adapter);
 222                 }
 223
 224                 if ((Adapter->IdleMode || Adapter->bShutStatus) && atomic_read(&Adapter->TotalPacketCount)) {
 225                         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Device in Low Power mode...waking up");
 226                         Adapter->usIdleModePattern = ABORT_IDLE_MODE;
 227                         Adapter->bWakeUpDevice = TRUE;
 228                         wake_up(&Adapter->process_rx_cntrlpkt);
 229                 }
 230
 231                 transmit_packets(Adapter);
 232                 atomic_set(&Adapter->TxPktAvail, 0);
 233         }
 234
 235         BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Exiting the tx thread..\n");
 236         Adapter->transmit_packet_thread = NULL;
 237         return 0;
 238 }