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#pragma once
#include "ib_low.h"
namespace NNetliba {
// buffer id 0 is special, it is used when data is sent inline and should not be returned
const size_t SMALL_PKT_SIZE = 4096;
const ui64 BP_AH_USED_FLAG = 0x1000000000000000ul;
const ui64 BP_BUF_ID_MASK = 0x00000000fffffffful;
// single thread version
class TIBBufferPool: public TThrRefBase, TNonCopyable {
enum {
BLOCK_SIZE_LN = 11,
BLOCK_SIZE = 1 << BLOCK_SIZE_LN,
BLOCK_COUNT = 1024
};
struct TSingleBlock {
TIntrusivePtr<TMemoryRegion> Mem;
TVector<ui8> BlkRefCounts;
TVector<TIntrusivePtr<TAddressHandle>> AHHolder;
void Alloc(TPtrArg<TIBContext> ctx) {
size_t dataSize = SMALL_PKT_SIZE * BLOCK_SIZE;
Mem = new TMemoryRegion(ctx, dataSize);
BlkRefCounts.resize(BLOCK_SIZE, 0);
AHHolder.resize(BLOCK_SIZE);
}
char* GetBufData(ui64 idArg) {
char* data = Mem->GetData();
return data + (idArg & (BLOCK_SIZE - 1)) * SMALL_PKT_SIZE;
}
};
TIntrusivePtr<TIBContext> IBCtx;
TVector<int> FreeList;
TVector<TSingleBlock> Blocks;
size_t FirstFreeBlock;
int PostRecvDeficit;
TIntrusivePtr<TSharedReceiveQueue> SRQ;
void AddBlock() {
if (FirstFreeBlock == Blocks.size()) {
Y_VERIFY(0, "run out of buffers");
}
Blocks[FirstFreeBlock].Alloc(IBCtx);
size_t start = (FirstFreeBlock == 0) ? 1 : FirstFreeBlock * BLOCK_SIZE;
size_t finish = FirstFreeBlock * BLOCK_SIZE + BLOCK_SIZE;
for (size_t i = start; i < finish; ++i) {
FreeList.push_back(i);
}
++FirstFreeBlock;
}
public:
TIBBufferPool(TPtrArg<TIBContext> ctx, int maxSRQWorkRequests)
: IBCtx(ctx)
, FirstFreeBlock(0)
, PostRecvDeficit(maxSRQWorkRequests)
{
Blocks.resize(BLOCK_COUNT);
AddBlock();
SRQ = new TSharedReceiveQueue(ctx, maxSRQWorkRequests);
PostRecv();
}
TSharedReceiveQueue* GetSRQ() const {
return SRQ.Get();
}
int AllocBuf() {
if (FreeList.empty()) {
AddBlock();
}
int id = FreeList.back();
FreeList.pop_back();
Y_ASSERT(++Blocks[id >> BLOCK_SIZE_LN].BlkRefCounts[id & (BLOCK_SIZE - 1)] == 1);
return id;
}
void FreeBuf(ui64 idArg) {
ui64 id = idArg & BP_BUF_ID_MASK;
if (id == 0) {
return;
}
Y_ASSERT(id > 0 && id < (ui64)(FirstFreeBlock * BLOCK_SIZE));
FreeList.push_back(id);
Y_ASSERT(--Blocks[id >> BLOCK_SIZE_LN].BlkRefCounts[id & (BLOCK_SIZE - 1)] == 0);
if (idArg & BP_AH_USED_FLAG) {
Blocks[id >> BLOCK_SIZE_LN].AHHolder[id & (BLOCK_SIZE - 1)] = nullptr;
}
}
char* GetBufData(ui64 idArg) {
ui64 id = idArg & BP_BUF_ID_MASK;
return Blocks[id >> BLOCK_SIZE_LN].GetBufData(id);
}
int PostSend(TPtrArg<TRCQueuePair> qp, const void* data, size_t len) {
if (len > SMALL_PKT_SIZE) {
Y_VERIFY(0, "buffer overrun");
}
if (len <= MAX_INLINE_DATA_SIZE) {
qp->PostSend(nullptr, 0, data, len);
return 0;
} else {
int id = AllocBuf();
TSingleBlock& blk = Blocks[id >> BLOCK_SIZE_LN];
char* buf = blk.GetBufData(id);
memcpy(buf, data, len);
qp->PostSend(blk.Mem, id, buf, len);
return id;
}
}
void PostSend(TPtrArg<TUDQueuePair> qp, TPtrArg<TAddressHandle> ah, int remoteQPN, int remoteQKey,
const void* data, size_t len) {
if (len > SMALL_PKT_SIZE - 40) {
Y_VERIFY(0, "buffer overrun");
}
ui64 id = AllocBuf();
TSingleBlock& blk = Blocks[id >> BLOCK_SIZE_LN];
int ptr = id & (BLOCK_SIZE - 1);
blk.AHHolder[ptr] = ah.Get();
id |= BP_AH_USED_FLAG;
if (len <= MAX_INLINE_DATA_SIZE) {
qp->PostSend(ah, remoteQPN, remoteQKey, nullptr, id, data, len);
} else {
char* buf = blk.GetBufData(id);
memcpy(buf, data, len);
qp->PostSend(ah, remoteQPN, remoteQKey, blk.Mem, id, buf, len);
}
}
void RequestPostRecv() {
++PostRecvDeficit;
}
void PostRecv() {
for (int i = 0; i < PostRecvDeficit; ++i) {
int id = AllocBuf();
TSingleBlock& blk = Blocks[id >> BLOCK_SIZE_LN];
char* buf = blk.GetBufData(id);
SRQ->PostReceive(blk.Mem, id, buf, SMALL_PKT_SIZE);
}
PostRecvDeficit = 0;
}
};
class TIBRecvPacketProcess: public TNonCopyable {
TIBBufferPool& BP;
ui64 Id;
char* Data;
public:
TIBRecvPacketProcess(TIBBufferPool& bp, const ibv_wc& wc)
: BP(bp)
, Id(wc.wr_id)
{
Y_ASSERT(wc.opcode & IBV_WC_RECV);
BP.RequestPostRecv();
Data = BP.GetBufData(Id);
}
// intended for postponed packet processing
// with this call RequestPostRecv() should be called outside (and PostRecv() too in order to avoid rnr situation)
TIBRecvPacketProcess(TIBBufferPool& bp, const ui64 wr_id)
: BP(bp)
, Id(wr_id)
{
Data = BP.GetBufData(Id);
}
~TIBRecvPacketProcess() {
BP.FreeBuf(Id);
BP.PostRecv();
}
char* GetData() const {
return Data;
}
char* GetUDData() const {
return Data + 40;
}
ibv_grh* GetGRH() const {
return (ibv_grh*)Data;
}
};
}
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