diff options
| author | Ursula Braun <ubraun@linux.vnet.ibm.com> | 2017-01-09 18:55:18 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-10 00:07:39 +0300 |
| commit | cd6851f30386e5e04b5c2253f8e1647ba0ebcd31 (patch) | |
| tree | 9aadc7a36c03303408ebe4d24011be3fcc9b9b6e /net/smc/smc_ib.c | |
| parent | 0cfdd8f92cac01afbb12e4500514036a2b78756b (diff) | |
| download | linux-cd6851f30386e5e04b5c2253f8e1647ba0ebcd31.tar.xz | |
smc: remote memory buffers (RMBs)
* allocate data RMB memory for sending and receiving
* size depends on the maximum socket send and receive buffers
* allocated RMBs are kept during life time of the owning link group
* map the allocated RMBs to DMA
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 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index 5b037f435bc1..762b7e13c93d 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -16,6 +16,7 @@ #include "smc_pnet.h" #include "smc_ib.h" +#include "smc_core.h" #include "smc.h" struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ @@ -29,6 +30,24 @@ u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system * identifier */ +/* map a new TX or RX buffer to DMA */ +int smc_ib_buf_map(struct smc_ib_device *smcibdev, int buf_size, + struct smc_buf_desc *buf_slot, + enum dma_data_direction data_direction) +{ + int rc = 0; + + if (buf_slot->dma_addr[SMC_SINGLE_LINK]) + return rc; /* already mapped */ + buf_slot->dma_addr[SMC_SINGLE_LINK] = + ib_dma_map_single(smcibdev->ibdev, buf_slot->cpu_addr, + buf_size, data_direction); + if (ib_dma_mapping_error(smcibdev->ibdev, + buf_slot->dma_addr[SMC_SINGLE_LINK])) + rc = -EIO; + return rc; +} + static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport) { struct net_device *ndev; |