net/smc: process add/delete link messages
Add initial support for the LLC messages ADD LINK and DELETE LINK.
Introduce a link state field. Extend the initial LLC handshake with
ADD LINK processing.
Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 0d491f5..5267ed1 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -313,6 +313,27 @@ static int smc_clnt_conf_first_link(struct smc_sock *smc)
if (rc < 0)
return SMC_CLC_DECL_TCL;
+ /* receive ADD LINK request from server over RoCE fabric */
+ rest = wait_for_completion_interruptible_timeout(&link->llc_add,
+ SMC_LLC_WAIT_TIME);
+ if (rest <= 0) {
+ struct smc_clc_msg_decline dclc;
+
+ rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
+ SMC_CLC_DECLINE);
+ return rc;
+ }
+
+ /* send add link reject message, only one link supported for now */
+ rc = smc_llc_send_add_link(link,
+ link->smcibdev->mac[link->ibport - 1],
+ &link->smcibdev->gid[link->ibport - 1],
+ SMC_LLC_RESP);
+ if (rc < 0)
+ return SMC_CLC_DECL_TCL;
+
+ link->state = SMC_LNK_ACTIVE;
+
return 0;
}
@@ -714,6 +735,27 @@ static int smc_serv_conf_first_link(struct smc_sock *smc)
if (link->llc_confirm_resp_rc)
return SMC_CLC_DECL_RMBE_EC;
+ /* send ADD LINK request to client over the RoCE fabric */
+ rc = smc_llc_send_add_link(link,
+ link->smcibdev->mac[link->ibport - 1],
+ &link->smcibdev->gid[link->ibport - 1],
+ SMC_LLC_REQ);
+ if (rc < 0)
+ return SMC_CLC_DECL_TCL;
+
+ /* receive ADD LINK response from client over the RoCE fabric */
+ rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
+ SMC_LLC_WAIT_TIME);
+ if (rest <= 0) {
+ struct smc_clc_msg_decline dclc;
+
+ rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
+ SMC_CLC_DECLINE);
+ return rc;
+ }
+
+ link->state = SMC_LNK_ACTIVE;
+
return 0;
}
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 31bb2d1..eb343e1 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -176,6 +176,7 @@ static int smc_lgr_create(struct smc_sock *smc,
lnk = &lgr->lnk[SMC_SINGLE_LINK];
/* initialize link */
+ lnk->state = SMC_LNK_ACTIVATING;
lnk->smcibdev = smcibdev;
lnk->ibport = ibport;
lnk->path_mtu = smcibdev->pattr[ibport - 1].active_mtu;
@@ -197,6 +198,8 @@ static int smc_lgr_create(struct smc_sock *smc,
goto destroy_qp;
init_completion(&lnk->llc_confirm);
init_completion(&lnk->llc_confirm_resp);
+ init_completion(&lnk->llc_add);
+ init_completion(&lnk->llc_add_resp);
smc->conn.lgr = lgr;
rwlock_init(&lgr->conns_lock);
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 2b65b3d..cead209 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -32,6 +32,12 @@ enum smc_lgr_role { /* possible roles of a link group */
SMC_SERV /* server */
};
+enum smc_link_state { /* possible states of a link */
+ SMC_LNK_INACTIVE, /* link is inactive */
+ SMC_LNK_ACTIVATING, /* link is being activated */
+ SMC_LNK_ACTIVE /* link is active */
+};
+
#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */
struct smc_wr_buf {
@@ -87,10 +93,14 @@ struct smc_link {
u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */
u8 peer_gid[sizeof(union ib_gid)]; /* gid of peer*/
u8 link_id; /* unique # within link group */
+
+ enum smc_link_state state; /* state of link */
struct completion llc_confirm; /* wait for rx of conf link */
struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */
int llc_confirm_rc; /* rc from confirm link msg */
int llc_confirm_resp_rc; /* rc from conf_resp msg */
+ struct completion llc_add; /* wait for rx of add link */
+ struct completion llc_add_resp; /* wait for rx of add link rsp*/
};
/* For now we just allow one parallel link per link group. The SMC protocol
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 838a160..45b3e02 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -4,9 +4,6 @@
*
* Link Layer Control (LLC)
*
- * For now, we only support the necessary "confirm link" functionality
- * which happens for the first RoCE link after successful CLC handshake.
- *
* Copyright IBM Corp. 2016
*
* Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
@@ -26,7 +23,13 @@
struct smc_llc_hdr {
struct smc_wr_rx_hdr common;
u8 length; /* 44 */
- u8 reserved;
+#if defined(__BIG_ENDIAN_BITFIELD)
+ u8 reserved:4,
+ add_link_rej_rsn:4;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 add_link_rej_rsn:4,
+ reserved:4;
+#endif
u8 flags;
};
@@ -43,6 +46,33 @@ struct smc_llc_msg_confirm_link { /* type 0x01 */
u8 reserved[9];
};
+#define SMC_LLC_FLAG_ADD_LNK_REJ 0x40
+#define SMC_LLC_REJ_RSN_NO_ALT_PATH 1
+
+#define SMC_LLC_ADD_LNK_MAX_LINKS 2
+
+struct smc_llc_msg_add_link { /* type 0x02 */
+ struct smc_llc_hdr hd;
+ u8 sender_mac[ETH_ALEN];
+ u8 reserved2[2];
+ u8 sender_gid[SMC_GID_SIZE];
+ u8 sender_qp_num[3];
+ u8 link_num;
+ u8 flags2; /* QP mtu */
+ u8 initial_psn[3];
+ u8 reserved[8];
+};
+
+#define SMC_LLC_FLAG_DEL_LINK_ALL 0x40
+#define SMC_LLC_FLAG_DEL_LINK_ORDERLY 0x20
+
+struct smc_llc_msg_del_link { /* type 0x04 */
+ struct smc_llc_hdr hd;
+ u8 link_num;
+ __be32 reason;
+ u8 reserved[35];
+} __packed; /* format defined in RFC7609 */
+
struct smc_llc_msg_test_link { /* type 0x07 */
struct smc_llc_hdr hd;
u8 user_data[16];
@@ -88,6 +118,8 @@ struct smc_llc_msg_delete_rkey { /* type 0x09 */
union smc_llc_msg {
struct smc_llc_msg_confirm_link confirm_link;
+ struct smc_llc_msg_add_link add_link;
+ struct smc_llc_msg_del_link delete_link;
struct smc_llc_msg_confirm_rkey confirm_rkey;
struct smc_llc_msg_confirm_rkey_cont confirm_rkey_cont;
@@ -176,7 +208,64 @@ int smc_llc_send_confirm_link(struct smc_link *link, u8 mac[],
hton24(confllc->sender_qp_num, link->roce_qp->qp_num);
/* confllc->link_num = SMC_SINGLE_LINK; already done by memset above */
memcpy(confllc->link_uid, lgr->id, SMC_LGR_ID_SIZE);
- confllc->max_links = SMC_LINKS_PER_LGR_MAX;
+ confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS; /* enforce peer resp. */
+ /* send llc message */
+ rc = smc_wr_tx_send(link, pend);
+ return rc;
+}
+
+/* send ADD LINK request or response */
+int smc_llc_send_add_link(struct smc_link *link, u8 mac[],
+ union ib_gid *gid,
+ enum smc_llc_reqresp reqresp)
+{
+ struct smc_llc_msg_add_link *addllc;
+ struct smc_wr_tx_pend_priv *pend;
+ struct smc_wr_buf *wr_buf;
+ int rc;
+
+ rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
+ if (rc)
+ return rc;
+ addllc = (struct smc_llc_msg_add_link *)wr_buf;
+ memset(addllc, 0, sizeof(*addllc));
+ addllc->hd.common.type = SMC_LLC_ADD_LINK;
+ addllc->hd.length = sizeof(struct smc_llc_msg_add_link);
+ if (reqresp == SMC_LLC_RESP) {
+ addllc->hd.flags |= SMC_LLC_FLAG_RESP;
+ /* always reject more links for now */
+ addllc->hd.flags |= SMC_LLC_FLAG_ADD_LNK_REJ;
+ addllc->hd.add_link_rej_rsn = SMC_LLC_REJ_RSN_NO_ALT_PATH;
+ }
+ memcpy(addllc->sender_mac, mac, ETH_ALEN);
+ memcpy(addllc->sender_gid, gid, SMC_GID_SIZE);
+ /* send llc message */
+ rc = smc_wr_tx_send(link, pend);
+ return rc;
+}
+
+/* send DELETE LINK request or response */
+int smc_llc_send_delete_link(struct smc_link *link,
+ enum smc_llc_reqresp reqresp)
+{
+ struct smc_llc_msg_del_link *delllc;
+ struct smc_wr_tx_pend_priv *pend;
+ struct smc_wr_buf *wr_buf;
+ int rc;
+
+ rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
+ if (rc)
+ return rc;
+ delllc = (struct smc_llc_msg_del_link *)wr_buf;
+ memset(delllc, 0, sizeof(*delllc));
+ delllc->hd.common.type = SMC_LLC_DELETE_LINK;
+ delllc->hd.length = sizeof(struct smc_llc_msg_add_link);
+ if (reqresp == SMC_LLC_RESP)
+ delllc->hd.flags |= SMC_LLC_FLAG_RESP;
+ /* DEL_LINK_ALL because only 1 link supported */
+ delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
+ delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
+ delllc->link_num = link->link_id;
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
@@ -239,12 +328,14 @@ static void smc_llc_rx_confirm_link(struct smc_link *link,
conf_rc = ENOTSUPP;
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
- if (lgr->role == SMC_SERV) {
+ if (lgr->role == SMC_SERV &&
+ link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_resp_rc = conf_rc;
complete(&link->llc_confirm_resp);
}
} else {
- if (lgr->role == SMC_CLNT) {
+ if (lgr->role == SMC_CLNT &&
+ link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_rc = conf_rc;
link->link_id = llc->link_num;
complete(&link->llc_confirm);
@@ -252,6 +343,55 @@ static void smc_llc_rx_confirm_link(struct smc_link *link,
}
}
+static void smc_llc_rx_add_link(struct smc_link *link,
+ struct smc_llc_msg_add_link *llc)
+{
+ struct smc_link_group *lgr = container_of(link, struct smc_link_group,
+ lnk[SMC_SINGLE_LINK]);
+
+ if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
+ if (link->state == SMC_LNK_ACTIVATING)
+ complete(&link->llc_add_resp);
+ } else {
+ if (link->state == SMC_LNK_ACTIVATING) {
+ complete(&link->llc_add);
+ return;
+ }
+
+ if (lgr->role == SMC_SERV) {
+ smc_llc_send_add_link(link,
+ link->smcibdev->mac[link->ibport - 1],
+ &link->smcibdev->gid[link->ibport - 1],
+ SMC_LLC_REQ);
+
+ } else {
+ smc_llc_send_add_link(link,
+ link->smcibdev->mac[link->ibport - 1],
+ &link->smcibdev->gid[link->ibport - 1],
+ SMC_LLC_RESP);
+ }
+ }
+}
+
+static void smc_llc_rx_delete_link(struct smc_link *link,
+ struct smc_llc_msg_del_link *llc)
+{
+ struct smc_link_group *lgr = container_of(link, struct smc_link_group,
+ lnk[SMC_SINGLE_LINK]);
+
+ if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
+ if (lgr->role == SMC_SERV)
+ smc_lgr_terminate(lgr);
+ } else {
+ if (lgr->role == SMC_SERV) {
+ smc_llc_send_delete_link(link, SMC_LLC_REQ);
+ } else {
+ smc_llc_send_delete_link(link, SMC_LLC_RESP);
+ smc_lgr_terminate(lgr);
+ }
+ }
+}
+
static void smc_llc_rx_test_link(struct smc_link *link,
struct smc_llc_msg_test_link *llc)
{
@@ -343,6 +483,12 @@ static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
case SMC_LLC_CONFIRM_LINK:
smc_llc_rx_confirm_link(link, &llc->confirm_link);
break;
+ case SMC_LLC_ADD_LINK:
+ smc_llc_rx_add_link(link, &llc->add_link);
+ break;
+ case SMC_LLC_DELETE_LINK:
+ smc_llc_rx_delete_link(link, &llc->delete_link);
+ break;
case SMC_LLC_CONFIRM_RKEY:
smc_llc_rx_confirm_rkey(link, &llc->confirm_rkey);
break;
@@ -368,6 +514,14 @@ static struct smc_wr_rx_handler smc_llc_rx_handlers[] = {
},
{
.handler = smc_llc_rx_handler,
+ .type = SMC_LLC_ADD_LINK
+ },
+ {
+ .handler = smc_llc_rx_handler,
+ .type = SMC_LLC_DELETE_LINK
+ },
+ {
+ .handler = smc_llc_rx_handler,
.type = SMC_LLC_CONFIRM_RKEY
},
{
diff --git a/net/smc/smc_llc.h b/net/smc/smc_llc.h
index 5573f0d..e4a7d5e 100644
--- a/net/smc/smc_llc.h
+++ b/net/smc/smc_llc.h
@@ -18,6 +18,7 @@
#define SMC_LLC_FLAG_RESP 0x80
#define SMC_LLC_WAIT_FIRST_TIME (5 * HZ)
+#define SMC_LLC_WAIT_TIME (2 * HZ)
enum smc_llc_reqresp {
SMC_LLC_REQ,
@@ -26,6 +27,8 @@ enum smc_llc_reqresp {
enum smc_llc_msg_type {
SMC_LLC_CONFIRM_LINK = 0x01,
+ SMC_LLC_ADD_LINK = 0x02,
+ SMC_LLC_DELETE_LINK = 0x04,
SMC_LLC_CONFIRM_RKEY = 0x06,
SMC_LLC_TEST_LINK = 0x07,
SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
@@ -35,6 +38,10 @@ enum smc_llc_msg_type {
/* transmit */
int smc_llc_send_confirm_link(struct smc_link *lnk, u8 mac[], union ib_gid *gid,
enum smc_llc_reqresp reqresp);
+int smc_llc_send_add_link(struct smc_link *link, u8 mac[], union ib_gid *gid,
+ enum smc_llc_reqresp reqresp);
+int smc_llc_send_delete_link(struct smc_link *link,
+ enum smc_llc_reqresp reqresp);
int smc_llc_send_test_link(struct smc_link *lnk, u8 user_data[16],
enum smc_llc_reqresp reqresp);
int smc_llc_init(void) __init;
