diff options
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; |