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-rw-r--r--net/smc/smc_ib.c19
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;
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