diff options
| author | Ursula Braun <ubraun@linux.vnet.ibm.com> | 2017-07-28 13:56:22 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-29 11:22:58 -0700 |
| commit | 10428dd8354cc1c74ee806df45c2227c1f9d7b0c (patch) | |
| tree | aeba542906415b93991296bbae5ad5f983587bcc /net/smc/smc_ib.c | |
| parent | b33982c3a6838d13024ae5a32e1f21897767b04b (diff) | |
net/smc: synchronize buffer usage with device
Usage of send buffer "sndbuf" is synced
(a) before filling sndbuf for cpu access
(b) after filling sndbuf for device access
Usage of receive buffer "RMB" is synced
(a) before reading RMB content for cpu access
(b) after reading RMB content for device access
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 | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index 021f061609f5..547e0e113b17 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -13,6 +13,7 @@ #include <linux/random.h> #include <linux/workqueue.h> +#include <linux/scatterlist.h> #include <rdma/ib_verbs.h> #include "smc_pnet.h" @@ -295,6 +296,46 @@ int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, return 0; } +/* synchronize buffer usage for cpu access */ +void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev, + struct smc_buf_desc *buf_slot, + enum dma_data_direction data_direction) +{ + struct scatterlist *sg; + unsigned int i; + + /* for now there is just one DMA address */ + for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, + buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { + if (!sg_dma_len(sg)) + break; + ib_dma_sync_single_for_cpu(smcibdev->ibdev, + sg_dma_address(sg), + sg_dma_len(sg), + data_direction); + } +} + +/* synchronize buffer usage for device access */ +void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev, + struct smc_buf_desc *buf_slot, + enum dma_data_direction data_direction) +{ + struct scatterlist *sg; + unsigned int i; + + /* for now there is just one DMA address */ + for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, + buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { + if (!sg_dma_len(sg)) + break; + ib_dma_sync_single_for_device(smcibdev->ibdev, + sg_dma_address(sg), + sg_dma_len(sg), + data_direction); + } +} + /* 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, |