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authorUrsula Braun <ubraun@linux.vnet.ibm.com>2017-01-09 16:55:18 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-09 22:07:39 +0100
commitcd6851f30386e5e04b5c2253f8e1647ba0ebcd31 (patch)
tree9aadc7a36c03303408ebe4d24011be3fcc9b9b6e /net/smc/smc_ib.c
parentsmc: connection and link group creation (diff)
downloadlinux-cd6851f30386e5e04b5c2253f8e1647ba0ebcd31.tar.xz
linux-cd6851f30386e5e04b5c2253f8e1647ba0ebcd31.zip
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.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;