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net/smc: CLC decline - V2 enhancements

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This patch covers the small SMCD version 2 changes for CLC decline.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2020-09-26 12:44:32 +02:00 committed by David S. Miller
parent b81a5eb789
commit e8d726c8e8
3 changed files with 30 additions and 15 deletions
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27
net/smc/af_smc.c
View File

@ -531,7 +531,8 @@ static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
}
/* decline and fall back during connect */
static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
u8 version)
{
int rc;
@ -541,7 +542,7 @@ static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
return reason_code;
}
if (reason_code != SMC_CLC_DECL_PEERDECL) {
rc = smc_clc_send_decline(smc, reason_code);
rc = smc_clc_send_decline(smc, reason_code, version);
if (rc < 0) {
if (smc->sk.sk_state == SMC_INIT)
sock_put(&smc->sk); /* passive closing */
@ -901,6 +902,7 @@ static int smc_connect_check_aclc(struct smc_init_info *ini,
/* perform steps before actually connecting */
static int __smc_connect(struct smc_sock *smc)
{
u8 version = smc_ism_v2_capable ? SMC_V2 : SMC_V1;
struct smc_clc_msg_accept_confirm_v2 *aclc2;
struct smc_clc_msg_accept_confirm *aclc;
struct smc_init_info *ini = NULL;
@ -914,13 +916,15 @@ static int __smc_connect(struct smc_sock *smc)
if (!tcp_sk(smc->clcsock->sk)->syn_smc)
return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
/* IPSec connections opt out of SMC-R optimizations */
/* IPSec connections opt out of SMC optimizations */
if (using_ipsec(smc))
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
version);
ini = kzalloc(sizeof(*ini), GFP_KERNEL);
if (!ini)
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM);
return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
version);
ini->smcd_version = SMC_V1;
ini->smcd_version |= smc_ism_v2_capable ? SMC_V2 : 0;
@ -956,6 +960,7 @@ static int __smc_connect(struct smc_sock *smc)
/* check if smc modes and versions of CLC proposal and accept match */
rc = smc_connect_check_aclc(ini, aclc);
version = aclc->hdr.version == SMC_V1 ? SMC_V1 : version;
if (rc)
goto vlan_cleanup;
@ -977,7 +982,7 @@ static int __smc_connect(struct smc_sock *smc)
kfree(buf);
fallback:
kfree(ini);
return smc_connect_decline_fallback(smc, rc);
return smc_connect_decline_fallback(smc, rc, version);
}
static void smc_connect_work(struct work_struct *work)
@ -1293,7 +1298,7 @@ static void smc_listen_out_err(struct smc_sock *new_smc)
/* listen worker: decline and fall back if possible */
static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
struct smc_init_info *ini)
struct smc_init_info *ini, u8 version)
{
/* RDMA setup failed, switch back to TCP */
if (ini->first_contact_local)
@ -1307,7 +1312,7 @@ static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
smc_switch_to_fallback(new_smc);
new_smc->fallback_rsn = reason_code;
if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
if (smc_clc_send_decline(new_smc, reason_code) < 0) {
if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
smc_listen_out_err(new_smc);
return;
}
@ -1638,6 +1643,7 @@ static void smc_listen_work(struct work_struct *work)
{
struct smc_sock *new_smc = container_of(work, struct smc_sock,
smc_listen_work);
u8 version = smc_ism_v2_capable ? SMC_V2 : SMC_V1;
struct socket *newclcsock = new_smc->clcsock;
struct smc_clc_msg_accept_confirm_v2 *cclc2;
struct smc_clc_msg_accept_confirm *cclc;
@ -1675,8 +1681,9 @@ static void smc_listen_work(struct work_struct *work)
SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
if (rc)
goto out_decl;
version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version;
/* IPSec connections opt out of SMC-R optimizations */
/* IPSec connections opt out of SMC optimizations */
if (using_ipsec(new_smc)) {
rc = SMC_CLC_DECL_IPSEC;
goto out_decl;
@ -1741,7 +1748,7 @@ static void smc_listen_work(struct work_struct *work)
out_unlock:
mutex_unlock(&smc_server_lgr_pending);
out_decl:
smc_listen_decline(new_smc, rc, ini);
smc_listen_decline(new_smc, rc, ini, version);
out_free:
kfree(ini);
kfree(buf);

5
net/smc/smc_clc.c
View File

@ -443,7 +443,7 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
}
/* send CLC DECLINE message across internal TCP socket */
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
{
struct smc_clc_msg_decline dclc;
struct msghdr msg;
@ -454,7 +454,8 @@ int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
dclc.hdr.type = SMC_CLC_DECLINE;
dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
dclc.hdr.version = SMC_V1;
dclc.hdr.version = version;
dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
SMC_FIRST_CONTACT_MASK : 0;
if ((!smc->conn.lgr || !smc->conn.lgr->is_smcd) &&

13
net/smc/smc_clc.h
View File

@ -244,8 +244,15 @@ struct smc_clc_msg_decline { /* clc decline message */
struct smc_clc_msg_hdr hdr;
u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
__be32 peer_diagnosis; /* diagnosis information */
u8 reserved2[4];
struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
#if defined(__BIG_ENDIAN_BITFIELD)
u8 os_type : 4,
reserved : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 reserved : 4,
os_type : 4;
#endif
u8 reserved2[3];
struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
} __aligned(4);
/* determine start of the prefix area within the proposal message */
@ -315,7 +322,7 @@ int smc_clc_prfx_match(struct socket *clcsock,
struct smc_clc_msg_proposal_prefix *prop);
int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
u8 expected_type, unsigned long timeout);
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info);
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version);
int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
u8 version);