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Date: Thu, 10 Sep 2020 18:48:23 +0200
From: Karsten Graul <kgraul@...ux.ibm.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
heiko.carstens@...ibm.com, raspl@...ux.ibm.com,
ubraun@...ux.ibm.com
Subject: [PATCH net-next 04/10] net/smc: common routine for CLC accept and confirm
From: Ursula Braun <ubraun@...ux.ibm.com>
smc_clc_send_accept() and smc_clc_send_confirm() are quite similar.
Move common code into a separate function smc_clc_send_confirm_accept().
And introduce separate SMCD and SMCR struct definitions for CLC accept
resp. confirm.
No functional change.
Signed-off-by: Ursula Braun <ubraun@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
---
net/smc/af_smc.c | 36 +++++------
net/smc/smc_clc.c | 147 ++++++++++++++++++---------------------------
net/smc/smc_clc.h | 74 ++++++++++++-----------
net/smc/smc_core.c | 4 +-
4 files changed, 118 insertions(+), 143 deletions(-)
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 00e2a4ce0131..fa97144690e0 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -436,10 +436,10 @@ static int smcr_clnt_conf_first_link(struct smc_sock *smc)
static void smcr_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
- int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
+ int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
- smc->conn.peer_rmbe_idx = clc->rmbe_idx;
- smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
+ smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
+ smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
smc->conn.peer_rmbe_size = bufsize;
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
@@ -448,10 +448,10 @@ static void smcr_conn_save_peer_info(struct smc_sock *smc,
static void smcd_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
- int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
+ int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
- smc->conn.peer_rmbe_idx = clc->dmbe_idx;
- smc->conn.peer_token = clc->token;
+ smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
+ smc->conn.peer_token = clc->d0.token;
/* msg header takes up space in the buffer */
smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
@@ -470,11 +470,11 @@ static void smc_conn_save_peer_info(struct smc_sock *smc,
static void smc_link_save_peer_info(struct smc_link *link,
struct smc_clc_msg_accept_confirm *clc)
{
- link->peer_qpn = ntoh24(clc->qpn);
- memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
- memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
- link->peer_psn = ntoh24(clc->psn);
- link->peer_mtu = clc->qp_mtu;
+ link->peer_qpn = ntoh24(clc->r0.qpn);
+ memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE);
+ memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac));
+ link->peer_psn = ntoh24(clc->r0.psn);
+ link->peer_mtu = clc->r0.qp_mtu;
}
static void smc_switch_to_fallback(struct smc_sock *smc)
@@ -613,8 +613,8 @@ static int smc_connect_rdma(struct smc_sock *smc,
struct smc_link *link;
ini->is_smcd = false;
- ini->ib_lcl = &aclc->lcl;
- ini->ib_clcqpn = ntoh24(aclc->qpn);
+ ini->ib_lcl = &aclc->r0.lcl;
+ ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
ini->first_contact_peer = aclc->hdr.flag;
mutex_lock(&smc_client_lgr_pending);
@@ -634,9 +634,11 @@ static int smc_connect_rdma(struct smc_sock *smc,
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
struct smc_link *l = &smc->conn.lgr->lnk[i];
- if (l->peer_qpn == ntoh24(aclc->qpn) &&
- !memcmp(l->peer_gid, &aclc->lcl.gid, SMC_GID_SIZE) &&
- !memcmp(l->peer_mac, &aclc->lcl.mac, sizeof(l->peer_mac))) {
+ if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
+ !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
+ SMC_GID_SIZE) &&
+ !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
+ sizeof(l->peer_mac))) {
link = l;
break;
}
@@ -707,7 +709,7 @@ static int smc_connect_ism(struct smc_sock *smc,
int rc = 0;
ini->is_smcd = true;
- ini->ism_peer_gid = aclc->gid;
+ ini->ism_peer_gid = aclc->d0.gid;
ini->first_contact_peer = aclc->hdr.flag;
/* there is only one lgr role for SMC-D; use server lock */
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index 0c8e74faf5ca..bd116e1949b9 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -497,65 +497,85 @@ int smc_clc_send_proposal(struct smc_sock *smc, int smc_type,
return reason_code;
}
-/* send CLC CONFIRM message across internal TCP socket */
-int smc_clc_send_confirm(struct smc_sock *smc)
+/* build and send CLC CONFIRM / ACCEPT message */
+static int smc_clc_send_confirm_accept(struct smc_sock *smc,
+ struct smc_clc_msg_accept_confirm *clc,
+ int first_contact)
{
struct smc_connection *conn = &smc->conn;
- struct smc_clc_msg_accept_confirm cclc;
- struct smc_link *link;
- int reason_code = 0;
struct msghdr msg;
struct kvec vec;
- int len;
/* send SMC Confirm CLC msg */
- memset(&cclc, 0, sizeof(cclc));
- cclc.hdr.type = SMC_CLC_CONFIRM;
- cclc.hdr.version = SMC_V1; /* SMC version */
+ clc->hdr.version = SMC_V1; /* SMC version */
+ if (first_contact)
+ clc->hdr.flag = 1;
if (conn->lgr->is_smcd) {
/* SMC-D specific settings */
- memcpy(cclc.hdr.eyecatcher, SMCD_EYECATCHER,
+ memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
sizeof(SMCD_EYECATCHER));
- cclc.hdr.path = SMC_TYPE_D;
- cclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
- cclc.gid = conn->lgr->smcd->local_gid;
- cclc.token = conn->rmb_desc->token;
- cclc.dmbe_size = conn->rmbe_size_short;
- cclc.dmbe_idx = 0;
- memcpy(&cclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
- memcpy(cclc.smcd_trl.eyecatcher, SMCD_EYECATCHER,
+ clc->hdr.path = SMC_TYPE_D;
+ clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
+ clc->d0.gid = conn->lgr->smcd->local_gid;
+ clc->d0.token = conn->rmb_desc->token;
+ clc->d0.dmbe_size = conn->rmbe_size_short;
+ clc->d0.dmbe_idx = 0;
+ memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
+ memcpy(clc->d0.smcd_trl.eyecatcher, SMCD_EYECATCHER,
sizeof(SMCD_EYECATCHER));
} else {
+ struct smc_link *link = conn->lnk;
+
/* SMC-R specific settings */
link = conn->lnk;
- memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER,
+ memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
sizeof(SMC_EYECATCHER));
- cclc.hdr.path = SMC_TYPE_R;
- cclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
- memcpy(cclc.lcl.id_for_peer, local_systemid,
+ clc->hdr.path = SMC_TYPE_R;
+ clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
+ memcpy(clc->r0.lcl.id_for_peer, local_systemid,
sizeof(local_systemid));
- memcpy(&cclc.lcl.gid, link->gid, SMC_GID_SIZE);
- memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
+ memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
+ memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
ETH_ALEN);
- hton24(cclc.qpn, link->roce_qp->qp_num);
- cclc.rmb_rkey =
+ hton24(clc->r0.qpn, link->roce_qp->qp_num);
+ clc->r0.rmb_rkey =
htonl(conn->rmb_desc->mr_rx[link->link_idx]->rkey);
- cclc.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
- cclc.rmbe_alert_token = htonl(conn->alert_token_local);
- cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
- cclc.rmbe_size = conn->rmbe_size_short;
- cclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
+ clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
+ clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
+ switch (clc->hdr.type) {
+ case SMC_CLC_ACCEPT:
+ clc->r0.qp_mtu = link->path_mtu;
+ break;
+ case SMC_CLC_CONFIRM:
+ clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
+ break;
+ }
+ clc->r0.rmbe_size = conn->rmbe_size_short;
+ clc->r0.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
(conn->rmb_desc->sgt[link->link_idx].sgl));
- hton24(cclc.psn, link->psn_initial);
- memcpy(cclc.smcr_trl.eyecatcher, SMC_EYECATCHER,
+ hton24(clc->r0.psn, link->psn_initial);
+ memcpy(clc->r0.smcr_trl.eyecatcher, SMC_EYECATCHER,
sizeof(SMC_EYECATCHER));
}
memset(&msg, 0, sizeof(msg));
- vec.iov_base = &cclc;
- vec.iov_len = ntohs(cclc.hdr.length);
- len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
- ntohs(cclc.hdr.length));
+ vec.iov_base = clc;
+ vec.iov_len = ntohs(clc->hdr.length);
+ return kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
+ ntohs(clc->hdr.length));
+}
+
+/* send CLC CONFIRM message across internal TCP socket */
+int smc_clc_send_confirm(struct smc_sock *smc)
+{
+ struct smc_clc_msg_accept_confirm cclc;
+ int reason_code = 0;
+ int len;
+
+ /* send SMC Confirm CLC msg */
+ memset(&cclc, 0, sizeof(cclc));
+ cclc.hdr.type = SMC_CLC_CONFIRM;
+ len = smc_clc_send_confirm_accept(smc, &cclc, 0);
if (len < ntohs(cclc.hdr.length)) {
if (len >= 0) {
reason_code = -ENETUNREACH;
@@ -571,63 +591,12 @@ int smc_clc_send_confirm(struct smc_sock *smc)
/* send CLC ACCEPT message across internal TCP socket */
int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact)
{
- struct smc_connection *conn = &new_smc->conn;
struct smc_clc_msg_accept_confirm aclc;
- struct smc_link *link;
- struct msghdr msg;
- struct kvec vec;
int len;
memset(&aclc, 0, sizeof(aclc));
aclc.hdr.type = SMC_CLC_ACCEPT;
- aclc.hdr.version = SMC_V1; /* SMC version */
- if (srv_first_contact)
- aclc.hdr.flag = 1;
-
- if (conn->lgr->is_smcd) {
- /* SMC-D specific settings */
- aclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
- memcpy(aclc.hdr.eyecatcher, SMCD_EYECATCHER,
- sizeof(SMCD_EYECATCHER));
- aclc.hdr.path = SMC_TYPE_D;
- aclc.gid = conn->lgr->smcd->local_gid;
- aclc.token = conn->rmb_desc->token;
- aclc.dmbe_size = conn->rmbe_size_short;
- aclc.dmbe_idx = 0;
- memcpy(&aclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
- memcpy(aclc.smcd_trl.eyecatcher, SMCD_EYECATCHER,
- sizeof(SMCD_EYECATCHER));
- } else {
- /* SMC-R specific settings */
- aclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
- memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER,
- sizeof(SMC_EYECATCHER));
- aclc.hdr.path = SMC_TYPE_R;
- link = conn->lnk;
- memcpy(aclc.lcl.id_for_peer, local_systemid,
- sizeof(local_systemid));
- memcpy(&aclc.lcl.gid, link->gid, SMC_GID_SIZE);
- memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1],
- ETH_ALEN);
- hton24(aclc.qpn, link->roce_qp->qp_num);
- aclc.rmb_rkey =
- htonl(conn->rmb_desc->mr_rx[link->link_idx]->rkey);
- aclc.rmbe_idx = 1; /* as long as 1 RMB = 1 RMBE */
- aclc.rmbe_alert_token = htonl(conn->alert_token_local);
- aclc.qp_mtu = link->path_mtu;
- aclc.rmbe_size = conn->rmbe_size_short,
- aclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
- (conn->rmb_desc->sgt[link->link_idx].sgl));
- hton24(aclc.psn, link->psn_initial);
- memcpy(aclc.smcr_trl.eyecatcher, SMC_EYECATCHER,
- sizeof(SMC_EYECATCHER));
- }
-
- memset(&msg, 0, sizeof(msg));
- vec.iov_base = &aclc;
- vec.iov_len = ntohs(aclc.hdr.length);
- len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1,
- ntohs(aclc.hdr.length));
+ len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact);
if (len < ntohs(aclc.hdr.length))
len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h
index 7f7c55ff0476..fda474e91f95 100644
--- a/net/smc/smc_clc.h
+++ b/net/smc/smc_clc.h
@@ -118,46 +118,50 @@ struct smc_clc_msg_proposal_area {
struct smc_clc_msg_trail pclc_trl;
};
-struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
- struct smc_clc_msg_hdr hdr;
- union {
- struct { /* SMC-R */
- struct smc_clc_msg_local lcl;
- u8 qpn[3]; /* QP number */
- __be32 rmb_rkey; /* RMB rkey */
- u8 rmbe_idx; /* Index of RMBE in RMB */
- __be32 rmbe_alert_token;/* unique connection id */
-#if defined(__BIG_ENDIAN_BITFIELD)
- u8 rmbe_size : 4, /* buf size (compressed) */
- qp_mtu : 4; /* QP mtu */
+struct smcr_clc_msg_accept_confirm { /* SMCR accept/confirm */
+ struct smc_clc_msg_local lcl;
+ u8 qpn[3]; /* QP number */
+ __be32 rmb_rkey; /* RMB rkey */
+ u8 rmbe_idx; /* Index of RMBE in RMB */
+ __be32 rmbe_alert_token; /* unique connection id */
+ #if defined(__BIG_ENDIAN_BITFIELD)
+ u8 rmbe_size : 4, /* buf size (compressed) */
+ qp_mtu : 4; /* QP mtu */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
- u8 qp_mtu : 4,
- rmbe_size : 4;
+ u8 qp_mtu : 4,
+ rmbe_size : 4;
#endif
- u8 reserved;
- __be64 rmb_dma_addr; /* RMB virtual address */
- u8 reserved2;
- u8 psn[3]; /* packet sequence number */
- struct smc_clc_msg_trail smcr_trl;
- /* eye catcher "SMCR" EBCDIC */
- } __packed;
- struct { /* SMC-D */
- u64 gid; /* Sender GID */
- u64 token; /* DMB token */
- u8 dmbe_idx; /* DMBE index */
+ u8 reserved;
+ __be64 rmb_dma_addr; /* RMB virtual address */
+ u8 reserved2;
+ u8 psn[3]; /* packet sequence number */
+ struct smc_clc_msg_trail smcr_trl;
+ /* eye catcher "SMCR" EBCDIC */
+} __packed;
+
+struct smcd_clc_msg_accept_confirm { /* SMCD accept/confirm */
+ u64 gid; /* Sender GID */
+ u64 token; /* DMB token */
+ u8 dmbe_idx; /* DMBE index */
#if defined(__BIG_ENDIAN_BITFIELD)
- u8 dmbe_size : 4, /* buf size (compressed) */
- reserved3 : 4;
+ u8 dmbe_size : 4, /* buf size (compressed) */
+ reserved3 : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
- u8 reserved3 : 4,
- dmbe_size : 4;
+ u8 reserved3 : 4,
+ dmbe_size : 4;
#endif
- u16 reserved4;
- u32 linkid; /* Link identifier */
- u32 reserved5[3];
- struct smc_clc_msg_trail smcd_trl;
- /* eye catcher "SMCD" EBCDIC */
- } __packed;
+ u16 reserved4;
+ u32 linkid; /* Link identifier */
+ u32 reserved5[3];
+ struct smc_clc_msg_trail smcd_trl;
+ /* eye catcher "SMCD" EBCDIC */
+} __packed;
+
+struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
+ struct smc_clc_msg_hdr hdr;
+ union {
+ struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
+ struct smcd_clc_msg_accept_confirm d0; /* SMC-D */
};
} __packed; /* format defined in RFC7609 */
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index c02e58002782..0c6dfca7f0c7 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1892,8 +1892,8 @@ int smc_rmb_rtoken_handling(struct smc_connection *conn,
struct smc_link *lnk,
struct smc_clc_msg_accept_confirm *clc)
{
- conn->rtoken_idx = smc_rtoken_add(lnk, clc->rmb_dma_addr,
- clc->rmb_rkey);
+ conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
+ clc->r0.rmb_rkey);
if (conn->rtoken_idx < 0)
return conn->rtoken_idx;
return 0;
--
2.17.1
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