From a082ec897ffed754aae39a9665af161f1a6fa44b Mon Sep 17 00:00:00 2001 From: Hans Wippel Date: Tue, 25 Feb 2020 22:41:22 +0100 Subject: 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 Signed-off-by: David S. Miller --- net/smc/smc_clc.c | 3 ++- net/smc/smc_ib.c | 2 +- net/smc/smc_ib.h | 1 + 3 files changed, 4 insertions(+), 2 deletions(-) (limited to 'net/smc') 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 -- cgit v1.2.3