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net/smc: Introduce a sysctl for setting SMC-R buffer type

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This patch introduces the sysctl smcr_buf_type for setting
the type of SMC-R sndbufs and RMBs.

Valid values includes:

- SMCR_PHYS_CONT_BUFS, which means use physically contiguous
  buffers for better performance and is the default value.

- SMCR_VIRT_CONT_BUFS, which means use virtually contiguous
  buffers in case of physically contiguous memory is scarce.

- SMCR_MIXED_BUFS, which means first try to use physically
  contiguous buffers. If not available, then use virtually
  contiguous buffers.

Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wen Gu 2022-07-14 17:44:02 +08:00 committed by David S. Miller
parent 0ef69e7884
commit 4bc5008e43
4 changed files with 31 additions and 0 deletions
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13
Documentation/networking/smc-sysctl.rst
View File

@ -21,3 +21,16 @@ autocorking_size - INTEGER
know how/when to uncork their sockets.
Default: 64K
smcr_buf_type - INTEGER
Controls which type of sndbufs and RMBs to use in later newly created
SMC-R link group. Only for SMC-R.
Default: 0 (physically contiguous sndbufs and RMBs)
Possible values:
- 0 - Use physically contiguous buffers
- 1 - Use virtually contiguous buffers
- 2 - Mixed use of the two types. Try physically contiguous buffers first.
If not available, use virtually contiguous buffers then.

1
include/net/netns/smc.h
View File

@ -18,5 +18,6 @@ struct netns_smc {
struct ctl_table_header *smc_hdr;
#endif
unsigned int sysctl_autocorking_size;
unsigned int sysctl_smcr_buf_type;
};
#endif

6
net/smc/smc_core.h
View File

@ -217,6 +217,12 @@ enum smc_lgr_type { /* redundancy state of lgr */
SMC_LGR_ASYMMETRIC_LOCAL, /* local has 1, peer 2 active RNICs */
};
enum smcr_buf_type { /* types of SMC-R sndbufs and RMBs */
SMCR_PHYS_CONT_BUFS = 0,
SMCR_VIRT_CONT_BUFS = 1,
SMCR_MIXED_BUFS = 2,
};
enum smc_llc_flowtype {
SMC_LLC_FLOW_NONE = 0,
SMC_LLC_FLOW_ADD_LINK = 2,

11
net/smc/smc_sysctl.c
View File

@ -15,6 +15,7 @@
#include <net/net_namespace.h>
#include "smc.h"
#include "smc_core.h"
#include "smc_sysctl.h"
static struct ctl_table smc_table[] = {
@ -25,6 +26,15 @@ static struct ctl_table smc_table[] = {
.mode = 0644,
.proc_handler = proc_douintvec,
},
{
.procname = "smcr_buf_type",
.data = &init_net.smc.sysctl_smcr_buf_type,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_douintvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
{ }
};
@ -49,6 +59,7 @@ int __net_init smc_sysctl_net_init(struct net *net)
goto err_reg;
net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
return 0;