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rds: stop using dmapool

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RDMA ULPs should only perform DMA through the ib_dma_* API instead of
using the hidden dma_device directly.  In addition using the dma coherent
API family that dmapool is a part of can be very ineffcient on plaforms
that are not DMA coherent.  Switch to use slab allocations and the
ib_dma_* APIs instead.

Link: https://lore.kernel.org/r/20201106181941.1878556-6-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Christoph Hellwig
2020-11-06 19:19:36 +01:00
committed by Jason Gunthorpe
parent bf3b7b7ba9
commit 42f2611cc1
5 changed files with 101 additions and 69 deletions
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8
net/rds/ib_send.c
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@@ -638,6 +638,10 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
send->s_sge[0].length = sizeof(struct rds_header);
send->s_sge[0].lkey = ic->i_pd->local_dma_lkey;
ib_dma_sync_single_for_cpu(ic->rds_ibdev->dev,
ic->i_send_hdrs_dma[pos],
sizeof(struct rds_header),
DMA_TO_DEVICE);
memcpy(ic->i_send_hdrs[pos], &rm->m_inc.i_hdr,
sizeof(struct rds_header));
@@ -688,6 +692,10 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
adv_credits = 0;
rds_ib_stats_inc(s_ib_tx_credit_updates);
}
ib_dma_sync_single_for_device(ic->rds_ibdev->dev,
ic->i_send_hdrs_dma[pos],
sizeof(struct rds_header),
DMA_TO_DEVICE);
if (prev)
prev->s_wr.next = &send->s_wr;