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authorAli Saidi <saidi@eecs.umich.edu>2008-05-20 16:06:56 -0400
committerAli Saidi <saidi@eecs.umich.edu>2008-05-20 16:06:56 -0400
commitf5e36d156dc33a6c01c69c19efc2b5b0450496f6 (patch)
tree2eb6c0cf165e32a6f56706a7cf2ae14230495c5b /src/dev
parentb7af65f414d34cb6b3817bc748fd053f505b0fea (diff)
downloadgem5-f5e36d156dc33a6c01c69c19efc2b5b0450496f6.tar.xz
IGbE: Implement sending packet that is contained in more than 2 descriptors.
--HG-- extra : convert_revision : 8fb7d5fad5cb840f69c31aa8b331dbe09e46ee9d
Diffstat (limited to 'src/dev')
-rw-r--r--src/dev/i8254xGBe.cc19
-rw-r--r--src/dev/i8254xGBe.hh9
2 files changed, 21 insertions, 7 deletions
diff --git a/src/dev/i8254xGBe.cc b/src/dev/i8254xGBe.cc
index 44e056fc3..ff255d5f7 100644
--- a/src/dev/i8254xGBe.cc
+++ b/src/dev/i8254xGBe.cc
@@ -919,7 +919,7 @@ IGbE::TxDescCache::getPacketData(EthPacketPtr p)
pktWaiting = true;
- DPRINTF(EthernetDesc, "Starting DMA of packet\n");
+ DPRINTF(EthernetDesc, "Starting DMA of packet at offset %d\n", p->length);
igbe->dmaRead(igbe->platform->pciToDma(TxdOp::getBuf(desc)),
TxdOp::getLen(desc), &pktEvent, p->data + p->length);
@@ -943,20 +943,22 @@ IGbE::TxDescCache::pktComplete()
DPRINTF(EthernetDesc, "TxDescriptor data d1: %#llx d2: %#llx\n", desc->d1, desc->d2);
if (!TxdOp::eop(desc)) {
- // This only supports two descriptors per tx packet
- assert(pktPtr->length == 0);
- pktPtr->length = TxdOp::getLen(desc);
+ pktPtr->length += TxdOp::getLen(desc);
unusedCache.pop_front();
usedCache.push_back(desc);
pktDone = true;
pktWaiting = false;
+ pktMultiDesc = true;
+
+ DPRINTF(EthernetDesc, "Partial Packet Descriptor of %d bytes Done\n",
+ pktPtr->length);
pktPtr = NULL;
- DPRINTF(EthernetDesc, "Partial Packet Descriptor Done\n");
enableSm();
igbe->checkDrain();
return;
}
+ pktMultiDesc = false;
// Set the length of the data in the EtherPacket
pktPtr->length += TxdOp::getLen(desc);
@@ -988,7 +990,7 @@ IGbE::TxDescCache::pktComplete()
if (TxdOp::isData(desc) && ( TxdOp::ixsm(desc) || TxdOp::txsm(desc)) ) {
DPRINTF(EthernetDesc, "Calculating checksums for packet\n");
IpPtr ip(pktPtr);
-
+ assert(ip);
if (TxdOp::ixsm(desc)) {
ip->sum(0);
ip->sum(cksum(ip));
@@ -1058,6 +1060,7 @@ IGbE::TxDescCache::serialize(std::ostream &os)
SERIALIZE_SCALAR(pktDone);
SERIALIZE_SCALAR(isTcp);
SERIALIZE_SCALAR(pktWaiting);
+ SERIALIZE_SCALAR(pktMultiDesc);
}
void
@@ -1067,6 +1070,7 @@ IGbE::TxDescCache::unserialize(Checkpoint *cp, const std::string &section)
UNSERIALIZE_SCALAR(pktDone);
UNSERIALIZE_SCALAR(isTcp);
UNSERIALIZE_SCALAR(pktWaiting);
+ UNSERIALIZE_SCALAR(pktMultiDesc);
}
bool
@@ -1172,7 +1176,8 @@ IGbE::txStateMachine()
// If we have a packet available and it's length is not 0 (meaning it's not
// a multidescriptor packet) put it in the fifo, otherwise an the next
// iteration we'll get the rest of the data
- if (txPacket && txDescCache.packetAvailable() && txPacket->length) {
+ if (txPacket && txDescCache.packetAvailable()
+ && !txDescCache.packetMultiDesc() && txPacket->length) {
bool success;
DPRINTF(EthernetSM, "TXS: packet placed in TX FIFO\n");
diff --git a/src/dev/i8254xGBe.hh b/src/dev/i8254xGBe.hh
index 9403c87b6..0daf094c1 100644
--- a/src/dev/i8254xGBe.hh
+++ b/src/dev/i8254xGBe.hh
@@ -564,6 +564,7 @@ class IGbE : public EtherDevice
bool pktDone;
bool isTcp;
bool pktWaiting;
+ bool pktMultiDesc;
public:
TxDescCache(IGbE *i, std::string n, int s);
@@ -586,6 +587,14 @@ class IGbE : public EtherDevice
*/
bool packetWaiting() { return pktWaiting; }
+ /** Ask if this packet is composed of multiple descriptors
+ * so even if we've got data, we need to wait for more before
+ * we can send it out.
+ * @return packet can't be sent out because it's a multi-descriptor
+ * packet
+ */
+ bool packetMultiDesc() { return pktMultiDesc;}
+
/** Called by event when dma to write packet is completed
*/
void pktComplete();