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net/smc: add v2 format of CLC decline message

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The CLC decline message changed with SMC-Rv2 and supports up to
4 additional diagnosis codes.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2021-10-16 11:37:47 +02:00 committed by David S. Miller
parent e49300a6bf
commit 8ade200c26
2 changed files with 55 additions and 10 deletions
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47
net/smc/smc_clc.c
View File

@ -400,6 +400,24 @@ smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
return true;
}
/* check arriving CLC decline */
static bool
smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
{
struct smc_clc_msg_hdr *hdr = &dclc->hdr;
if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
return false;
if (hdr->version == SMC_V1) {
if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
return false;
} else {
if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
return false;
}
return true;
}
static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
{
memset(fce, 0, sizeof(*fce));
@ -441,9 +459,9 @@ static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
break;
case SMC_CLC_DECLINE:
dclc = (struct smc_clc_msg_decline *)clcm;
if (ntohs(dclc->hdr.length) != sizeof(*dclc))
if (!smc_clc_msg_decl_valid(dclc))
return false;
trl = &dclc->trl;
check_trl = false;
break;
default:
return false;
@ -742,15 +760,16 @@ out:
/* send CLC DECLINE message across internal TCP socket */
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
{
struct smc_clc_msg_decline dclc;
struct smc_clc_msg_decline *dclc_v1;
struct smc_clc_msg_decline_v2 dclc;
struct msghdr msg;
int len, send_len;
struct kvec vec;
int len;
dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
memset(&dclc, 0, sizeof(dclc));
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 = version;
dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
@ -760,14 +779,22 @@ int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
memcpy(dclc.id_for_peer, local_systemid,
sizeof(local_systemid));
dclc.peer_diagnosis = htonl(peer_diag_info);
memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
if (version == SMC_V1) {
memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
sizeof(SMC_EYECATCHER));
send_len = sizeof(*dclc_v1);
} else {
memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
sizeof(SMC_EYECATCHER));
send_len = sizeof(dclc);
}
dclc.hdr.length = htons(send_len);
memset(&msg, 0, sizeof(msg));
vec.iov_base = &dclc;
vec.iov_len = sizeof(struct smc_clc_msg_decline);
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
sizeof(struct smc_clc_msg_decline));
if (len < 0 || len < sizeof(struct smc_clc_msg_decline))
vec.iov_len = send_len;
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
if (len < 0 || len < send_len)
len = -EPROTO;
return len > 0 ? 0 : len;
}

18
net/smc/smc_clc.h
View File

@ -281,6 +281,24 @@ struct smc_clc_msg_decline { /* clc decline message */
struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
} __aligned(4);
#define SMC_DECL_DIAG_COUNT_V2 4 /* no. of additional peer diagnosis codes */
struct smc_clc_msg_decline_v2 { /* clc decline message */
struct smc_clc_msg_hdr hdr;
u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
__be32 peer_diagnosis; /* diagnosis information */
#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];
__be32 peer_diagnosis_v2[SMC_DECL_DIAG_COUNT_V2];
struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
} __aligned(4);
/* determine start of the prefix area within the proposal message */
static inline struct smc_clc_msg_proposal_prefix *
smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)