diff options
| author | Hans Wippel <ndev@hwipl.net> | 2020-02-25 22:41:22 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-02-26 20:27:06 -0800 |
| commit | a082ec897ffed754aae39a9665af161f1a6fa44b (patch) | |
| tree | 35c6162e15cb025fbdddd50d37fba2724d26c0f9 /net | |
| parent | 366bb249b58381bc415a83608859019736b23766 (diff) | |
| download | linux-a082ec897ffed754aae39a9665af161f1a6fa44b.tar.bz2 | |
net/smc: improve peer ID in CLC decline for SMC-R
According to RFC 7609, all CLC messages contain a peer ID that consists
of a unique instance ID and the MAC address of one of the host's RoCE
devices. But if a SMC-R connection cannot be established, e.g., because
no matching pnet table entry is found, the current implementation uses a
zero value in the CLC decline message although the host's peer ID is set
to a proper value.
If no RoCE and no ISM device is usable for a connection, there is no LGR
and the LGR check in smc_clc_send_decline() prevents that the peer ID is
copied into the CLC decline message for both SMC-D and SMC-R. So, this
patch modifies the check to also accept the case of no LGR. Also, only a
valid peer ID is copied into the decline message.
Signed-off-by: Hans Wippel <ndev@hwipl.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/smc/smc_clc.c | 3 | ||||
| -rw-r--r-- | net/smc/smc_ib.c | 2 | ||||
| -rw-r--r-- | net/smc/smc_ib.h | 1 |
3 files changed, 4 insertions, 2 deletions
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c index 3e16b887cfcf..ea0068f0173c 100644 --- a/net/smc/smc_clc.c +++ b/net/smc/smc_clc.c @@ -372,7 +372,8 @@ int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info) dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline)); dclc.hdr.version = SMC_CLC_V1; dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0; - if (smc->conn.lgr && !smc->conn.lgr->is_smcd) + if ((!smc->conn.lgr || !smc->conn.lgr->is_smcd) && + smc_ib_is_valid_local_systemid()) memcpy(dclc.id_for_peer, local_systemid, sizeof(local_systemid)); dclc.peer_diagnosis = htonl(peer_diag_info); diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index e0592d337a94..3444de27fecd 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -166,7 +166,7 @@ static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, sizeof(smcibdev->mac[ibport - 1])); } -static bool smc_ib_is_valid_local_systemid(void) +bool smc_ib_is_valid_local_systemid(void) { return !is_zero_ether_addr(&local_systemid[2]); } diff --git a/net/smc/smc_ib.h b/net/smc/smc_ib.h index 255db87547d3..5c2b115d36da 100644 --- a/net/smc/smc_ib.h +++ b/net/smc/smc_ib.h @@ -84,4 +84,5 @@ void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev, enum dma_data_direction data_direction); int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, unsigned short vlan_id, u8 gid[], u8 *sgid_index); +bool smc_ib_is_valid_local_systemid(void); #endif |