diff options
| author | Ursula Braun <ubraun@linux.vnet.ibm.com> | 2017-07-28 13:56:15 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-29 11:22:57 -0700 |
| commit | a3fe3d01bd0d7cd6ee7a5e3eebc0926c47954fe7 (patch) | |
| tree | c0e06f13c8691a67638ec6d1ed143eea7e8d8cdd /net/smc/smc_ib.c | |
| parent | c45abf31e72f7640c5e84adda4683b72cb32a222 (diff) | |
net/smc: introduce sg-logic for RMBs
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>
Diffstat (limited to 'net/smc/smc_ib.c')
| -rw-r--r-- | net/smc/smc_ib.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index b31715505a35..fcfeb89b05d9 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -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; |