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net/smc: introduce sg-logic for RMBs

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The follow-on patch makes use of ib_map_mr_sg() when introducing
separate memory regions for RMBs. This function is based on
scatterlists; thus this patch introduces scatterlists for RMBs.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
2017-07-28 13:56:15 +02:00
committed by David S. Miller
parent c45abf31e7
commit a3fe3d01bd
5 changed files with 76 additions and 26 deletions
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31
net/smc/smc_ib.c
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@@ -283,6 +283,37 @@ void smc_ib_buf_unmap(struct smc_ib_device *smcibdev, int buf_size,
buf_slot->dma_addr[SMC_SINGLE_LINK] = 0;
}
/* Map a new TX or RX buffer SG-table to DMA */
int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
int mapped_nents;
mapped_nents = ib_dma_map_sg(smcibdev->ibdev,
buf_slot->sgt[SMC_SINGLE_LINK].sgl,
buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
data_direction);
if (!mapped_nents)
return -ENOMEM;
return mapped_nents;
}
void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address)
return; /* already unmapped */
ib_dma_unmap_sg(smcibdev->ibdev,
buf_slot->sgt[SMC_SINGLE_LINK].sgl,
buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
data_direction);
buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0;
}
static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport)
{
struct net_device *ndev;