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net/smc: introduce smc_pnet_find_alt_roce()

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Introduce a new function in smc_pnet.c that searches for an alternate
IB device, using an existing link group and a primary IB device. The
alternate IB device needs to be active and must have the same PNETID
as the link group.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2020-05-01 12:48:11 +02:00 committed by David S. Miller
parent 33d203302d
commit 6c868a3edc
2 changed files with 17 additions and 3 deletions
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15
net/smc/smc_pnet.c
View File

@ -777,7 +777,8 @@ static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
/* find a roce device for the given pnetid */
static void _smc_pnet_find_roce_by_pnetid(u8 *pnet_id,
struct smc_init_info *ini)
struct smc_init_info *ini,
struct smc_ib_device *known_dev)
{
struct smc_ib_device *ibdev;
int i;
@ -785,6 +786,8 @@ static void _smc_pnet_find_roce_by_pnetid(u8 *pnet_id,
ini->ib_dev = NULL;
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
if (ibdev == known_dev)
continue;
for (i = 1; i <= SMC_MAX_PORTS; i++) {
if (!rdma_is_port_valid(ibdev->ibdev, i))
continue;
@ -803,6 +806,14 @@ out:
spin_unlock(&smc_ib_devices.lock);
}
/* find alternate roce device with same pnet_id and vlan_id */
void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
struct smc_init_info *ini,
struct smc_ib_device *known_dev)
{
_smc_pnet_find_roce_by_pnetid(lgr->pnet_id, ini, known_dev);
}
/* if handshake network device belongs to a roce device, return its
* IB device and port
*/
@ -857,7 +868,7 @@ static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
smc_pnet_find_rdma_dev(ndev, ini);
return; /* pnetid could not be determined */
}
_smc_pnet_find_roce_by_pnetid(ndev_pnetid, ini);
_smc_pnet_find_roce_by_pnetid(ndev_pnetid, ini, NULL);
}
static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,

5
net/smc/smc_pnet.h
View File

@ -19,6 +19,7 @@
struct smc_ib_device;
struct smcd_dev;
struct smc_init_info;
struct smc_link_group;
/**
* struct smc_pnettable - SMC PNET table anchor
@ -48,5 +49,7 @@ void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini);
void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini);
int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port);
int smc_pnetid_by_table_smcd(struct smcd_dev *smcd);
void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
struct smc_init_info *ini,
struct smc_ib_device *known_dev);
#endif