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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. */
#include <linux/export.h>
#include <rdma/iter.h>
void __rdma_block_iter_start(struct ib_block_iter *biter,
struct scatterlist *sglist, unsigned int nents,
unsigned long pgsz)
{
memset(biter, 0, sizeof(struct ib_block_iter));
biter->__sg = sglist;
biter->__sg_nents = nents;
/* Driver provides best block size to use */
biter->__pg_bit = __fls(pgsz);
}
EXPORT_SYMBOL(__rdma_block_iter_start);
bool __rdma_block_iter_next(struct ib_block_iter *biter)
{
unsigned int block_offset;
unsigned int delta;
if (!biter->__sg_nents || !biter->__sg)
return false;
biter->__dma_addr = sg_dma_address(biter->__sg) + biter->__sg_advance;
block_offset = biter->__dma_addr & (BIT_ULL(biter->__pg_bit) - 1);
delta = BIT_ULL(biter->__pg_bit) - block_offset;
while (biter->__sg_nents && biter->__sg &&
sg_dma_len(biter->__sg) - biter->__sg_advance <= delta) {
delta -= sg_dma_len(biter->__sg) - biter->__sg_advance;
biter->__sg_advance = 0;
biter->__sg = sg_next(biter->__sg);
biter->__sg_nents--;
}
biter->__sg_advance += delta;
return true;
}
EXPORT_SYMBOL(__rdma_block_iter_next);
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