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net/smc: add pnetid support

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s390 hardware supports the definition of a so-call Physical NETwork
IDentifier (short PNETID) per network device port. These PNETIDS
can be used to identify network devices that are attached to the same
physical network (broadcast domain).

On s390 try to use the PNETID of the ethernet device port used for
initial connecting, and derive the IB device port used for SMC RDMA
traffic.

On platforms without PNETID support fall back to the existing
solution of a configured pnet table.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
2018-06-28 19:05:05 +02:00
committed by David S. Miller
parent be6a3f38ff
commit 0afff91c6f
5 changed files with 114 additions and 20 deletions
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14
net/smc/smc_pnet.h
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@@ -12,8 +12,22 @@
#ifndef _SMC_PNET_H
#define _SMC_PNET_H
#if IS_ENABLED(CONFIG_HAVE_PNETID)
#include <asm/pnet.h>
#endif
struct smc_ib_device;
static inline int smc_pnetid_by_dev_port(struct device *dev,
unsigned short port, u8 *pnetid)
{
#if IS_ENABLED(CONFIG_HAVE_PNETID)
return pnet_id_by_dev_port(dev, port, pnetid);
#else
return -ENOENT;
#endif
}
int smc_pnet_init(void) __init;
void smc_pnet_exit(void);
int smc_pnet_remove_by_ibdev(struct smc_ib_device *ibdev);