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smc_llc.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* Link Layer Control (LLC)
*
* Copyright IBM Corp. 2016
*
* Author(s): Klaus Wacker <[email protected]>
* Ursula Braun <[email protected]>
*/
#include <net/tcp.h>
#include <rdma/ib_verbs.h>
#include "smc.h"
#include "smc_core.h"
#include "smc_clc.h"
#include "smc_llc.h"
#include "smc_pnet.h"
#define SMC_LLC_DATA_LEN 40
struct smc_llc_hdr {
struct smc_wr_rx_hdr common;
u8 length; /* 44 */
#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;
};
#define SMC_LLC_FLAG_NO_RMBE_EYEC 0x03
struct smc_llc_msg_confirm_link { /* type 0x01 */
struct smc_llc_hdr hd;
u8 sender_mac[ETH_ALEN];
u8 sender_gid[SMC_GID_SIZE];
u8 sender_qp_num[3];
u8 link_num;
u8 link_uid[SMC_LGR_ID_SIZE];
u8 max_links;
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;
#if defined(__BIG_ENDIAN_BITFIELD)
u8 reserved3 : 4,
qp_mtu : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 qp_mtu : 4,
reserved3 : 4;
#endif
u8 initial_psn[3];
u8 reserved[8];
};
struct smc_llc_msg_add_link_cont_rt {
__be32 rmb_key;
__be32 rmb_key_new;
__be64 rmb_vaddr_new;
};
#define SMC_LLC_RKEYS_PER_CONT_MSG 2
struct smc_llc_msg_add_link_cont { /* type 0x03 */
struct smc_llc_hdr hd;
u8 link_num;
u8 num_rkeys;
u8 reserved2[2];
struct smc_llc_msg_add_link_cont_rt rt[SMC_LLC_RKEYS_PER_CONT_MSG];
u8 reserved[4];
} __packed; /* format defined in RFC7609 */
#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];
u8 reserved[24];
};
struct smc_rmb_rtoken {
union {
u8 num_rkeys; /* first rtoken byte of CONFIRM LINK msg */
/* is actually the num of rtokens, first */
/* rtoken is always for the current link */
u8 link_id; /* link id of the rtoken */
};
__be32 rmb_key;
__be64 rmb_vaddr;
} __packed; /* format defined in RFC7609 */
#define SMC_LLC_RKEYS_PER_MSG 3
struct smc_llc_msg_confirm_rkey { /* type 0x06 */
struct smc_llc_hdr hd;
struct smc_rmb_rtoken rtoken[SMC_LLC_RKEYS_PER_MSG];
u8 reserved;
};
#define SMC_LLC_DEL_RKEY_MAX 8
#define SMC_LLC_FLAG_RKEY_RETRY 0x10
#define SMC_LLC_FLAG_RKEY_NEG 0x20
struct smc_llc_msg_delete_rkey { /* type 0x09 */
struct smc_llc_hdr hd;
u8 num_rkeys;
u8 err_mask;
u8 reserved[2];
__be32 rkey[8];
u8 reserved2[4];
};
union smc_llc_msg {
struct smc_llc_msg_confirm_link confirm_link;
struct smc_llc_msg_add_link add_link;
struct smc_llc_msg_add_link_cont add_link_cont;
struct smc_llc_msg_del_link delete_link;
struct smc_llc_msg_confirm_rkey confirm_rkey;
struct smc_llc_msg_delete_rkey delete_rkey;
struct smc_llc_msg_test_link test_link;
struct {
struct smc_llc_hdr hdr;
u8 data[SMC_LLC_DATA_LEN];
} raw;
};
#define SMC_LLC_FLAG_RESP 0x80
struct smc_llc_qentry {
struct list_head list;
struct smc_link *link;
union smc_llc_msg msg;
};
static void smc_llc_enqueue(struct smc_link *link, union smc_llc_msg *llc);
struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow)
{
struct smc_llc_qentry *qentry = flow->qentry;
flow->qentry = NULL;
return qentry;
}
void smc_llc_flow_qentry_del(struct smc_llc_flow *flow)
{
struct smc_llc_qentry *qentry;
if (flow->qentry) {
qentry = flow->qentry;
flow->qentry = NULL;
kfree(qentry);
}
}
static inline void smc_llc_flow_qentry_set(struct smc_llc_flow *flow,
struct smc_llc_qentry *qentry)
{
flow->qentry = qentry;
}
static void smc_llc_flow_parallel(struct smc_link_group *lgr, u8 flow_type,
struct smc_llc_qentry *qentry)
{
u8 msg_type = qentry->msg.raw.hdr.common.type;
if ((msg_type == SMC_LLC_ADD_LINK || msg_type == SMC_LLC_DELETE_LINK) &&
flow_type != msg_type && !lgr->delayed_event) {
lgr->delayed_event = qentry;
return;
}
/* drop parallel or already-in-progress llc requests */
if (flow_type != msg_type)
pr_warn_once("smc: SMC-R lg %*phN dropped parallel "
"LLC msg: msg %d flow %d role %d\n",
SMC_LGR_ID_SIZE, &lgr->id,
qentry->msg.raw.hdr.common.type,
flow_type, lgr->role);
kfree(qentry);
}
/* try to start a new llc flow, initiated by an incoming llc msg */
static bool smc_llc_flow_start(struct smc_llc_flow *flow,
struct smc_llc_qentry *qentry)
{
struct smc_link_group *lgr = qentry->link->lgr;
spin_lock_bh(&lgr->llc_flow_lock);
if (flow->type) {
/* a flow is already active */
smc_llc_flow_parallel(lgr, flow->type, qentry);
spin_unlock_bh(&lgr->llc_flow_lock);
return false;
}
switch (qentry->msg.raw.hdr.common.type) {
case SMC_LLC_ADD_LINK:
flow->type = SMC_LLC_FLOW_ADD_LINK;
break;
case SMC_LLC_DELETE_LINK:
flow->type = SMC_LLC_FLOW_DEL_LINK;
break;
case SMC_LLC_CONFIRM_RKEY:
case SMC_LLC_DELETE_RKEY:
flow->type = SMC_LLC_FLOW_RKEY;
break;
default:
flow->type = SMC_LLC_FLOW_NONE;
}
if (qentry == lgr->delayed_event)
lgr->delayed_event = NULL;
smc_llc_flow_qentry_set(flow, qentry);
spin_unlock_bh(&lgr->llc_flow_lock);
return true;
}
/* start a new local llc flow, wait till current flow finished */
int smc_llc_flow_initiate(struct smc_link_group *lgr,
enum smc_llc_flowtype type)
{
enum smc_llc_flowtype allowed_remote = SMC_LLC_FLOW_NONE;
int rc;
/* all flows except confirm_rkey and delete_rkey are exclusive,
* confirm/delete rkey flows can run concurrently (local and remote)
*/
if (type == SMC_LLC_FLOW_RKEY)
allowed_remote = SMC_LLC_FLOW_RKEY;
again:
if (list_empty(&lgr->list))
return -ENODEV;
spin_lock_bh(&lgr->llc_flow_lock);
if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE &&
(lgr->llc_flow_rmt.type == SMC_LLC_FLOW_NONE ||
lgr->llc_flow_rmt.type == allowed_remote)) {
lgr->llc_flow_lcl.type = type;
spin_unlock_bh(&lgr->llc_flow_lock);
return 0;
}
spin_unlock_bh(&lgr->llc_flow_lock);
rc = wait_event_timeout(lgr->llc_flow_waiter, (list_empty(&lgr->list) ||
(lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE &&
(lgr->llc_flow_rmt.type == SMC_LLC_FLOW_NONE ||
lgr->llc_flow_rmt.type == allowed_remote))),
SMC_LLC_WAIT_TIME * 10);
if (!rc)
return -ETIMEDOUT;
goto again;
}
/* finish the current llc flow */
void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow)
{
spin_lock_bh(&lgr->llc_flow_lock);
memset(flow, 0, sizeof(*flow));
flow->type = SMC_LLC_FLOW_NONE;
spin_unlock_bh(&lgr->llc_flow_lock);
if (!list_empty(&lgr->list) && lgr->delayed_event &&
flow == &lgr->llc_flow_lcl)
schedule_work(&lgr->llc_event_work);
else
wake_up(&lgr->llc_flow_waiter);
}
/* lnk is optional and used for early wakeup when link goes down, useful in
* cases where we wait for a response on the link after we sent a request
*/
struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
struct smc_link *lnk,
int time_out, u8 exp_msg)
{
struct smc_llc_flow *flow = &lgr->llc_flow_lcl;
u8 rcv_msg;
wait_event_timeout(lgr->llc_msg_waiter,
(flow->qentry ||
(lnk && !smc_link_usable(lnk)) ||
list_empty(&lgr->list)),
time_out);
if (!flow->qentry ||
(lnk && !smc_link_usable(lnk)) || list_empty(&lgr->list)) {
smc_llc_flow_qentry_del(flow);
goto out;
}
rcv_msg = flow->qentry->msg.raw.hdr.common.type;
if (exp_msg && rcv_msg != exp_msg) {
if (exp_msg == SMC_LLC_ADD_LINK &&
rcv_msg == SMC_LLC_DELETE_LINK) {
/* flow_start will delay the unexpected msg */
smc_llc_flow_start(&lgr->llc_flow_lcl,
smc_llc_flow_qentry_clr(flow));
return NULL;
}
pr_warn_once("smc: SMC-R lg %*phN dropped unexpected LLC msg: "
"msg %d exp %d flow %d role %d flags %x\n",
SMC_LGR_ID_SIZE, &lgr->id, rcv_msg, exp_msg,
flow->type, lgr->role,
flow->qentry->msg.raw.hdr.flags);
smc_llc_flow_qentry_del(flow);
}
out:
return flow->qentry;
}
/********************************** send *************************************/
struct smc_llc_tx_pend {
};
/* handler for send/transmission completion of an LLC msg */
static void smc_llc_tx_handler(struct smc_wr_tx_pend_priv *pend,
struct smc_link *link,
enum ib_wc_status wc_status)
{
/* future work: handle wc_status error for recovery and failover */
}
/**
* smc_llc_add_pending_send() - add LLC control message to pending WQE transmits
* @link: Pointer to SMC link used for sending LLC control message.
* @wr_buf: Out variable returning pointer to work request payload buffer.
* @pend: Out variable returning pointer to private pending WR tracking.
* It's the context the transmit complete handler will get.
*
* Reserves and pre-fills an entry for a pending work request send/tx.
* Used by mid-level smc_llc_send_msg() to prepare for later actual send/tx.
* Can sleep due to smc_get_ctrl_buf (if not in softirq context).
*
* Return: 0 on success, otherwise an error value.
*/
static int smc_llc_add_pending_send(struct smc_link *link,
struct smc_wr_buf **wr_buf,
struct smc_wr_tx_pend_priv **pend)
{
int rc;
rc = smc_wr_tx_get_free_slot(link, smc_llc_tx_handler, wr_buf, NULL,
pend);
if (rc < 0)
return rc;
BUILD_BUG_ON_MSG(
sizeof(union smc_llc_msg) > SMC_WR_BUF_SIZE,
"must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg)");
BUILD_BUG_ON_MSG(
sizeof(union smc_llc_msg) != SMC_WR_TX_SIZE,
"must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send()");
BUILD_BUG_ON_MSG(
sizeof(struct smc_llc_tx_pend) > SMC_WR_TX_PEND_PRIV_SIZE,
"must increase SMC_WR_TX_PEND_PRIV_SIZE to at least sizeof(struct smc_llc_tx_pend)");
return 0;
}
/* high-level API to send LLC confirm link */
int smc_llc_send_confirm_link(struct smc_link *link,
enum smc_llc_reqresp reqresp)
{
struct smc_llc_msg_confirm_link *confllc;
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;
confllc = (struct smc_llc_msg_confirm_link *)wr_buf;
memset(confllc, 0, sizeof(*confllc));
confllc->hd.common.type = SMC_LLC_CONFIRM_LINK;
confllc->hd.length = sizeof(struct smc_llc_msg_confirm_link);
confllc->hd.flags |= SMC_LLC_FLAG_NO_RMBE_EYEC;
if (reqresp == SMC_LLC_RESP)
confllc->hd.flags |= SMC_LLC_FLAG_RESP;
memcpy(confllc->sender_mac, link->smcibdev->mac[link->ibport - 1],
ETH_ALEN);
memcpy(confllc->sender_gid, link->gid, SMC_GID_SIZE);
hton24(confllc->sender_qp_num, link->roce_qp->qp_num);
confllc->link_num = link->link_id;
memcpy(confllc->link_uid, link->link_uid, SMC_LGR_ID_SIZE);
confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS;
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
/* send LLC confirm rkey request */
static int smc_llc_send_confirm_rkey(struct smc_link *send_link,
struct smc_buf_desc *rmb_desc)
{
struct smc_llc_msg_confirm_rkey *rkeyllc;
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
struct smc_link *link;
int i, rc, rtok_ix;
rc = smc_llc_add_pending_send(send_link, &wr_buf, &pend);
if (rc)
return rc;
rkeyllc = (struct smc_llc_msg_confirm_rkey *)wr_buf;
memset(rkeyllc, 0, sizeof(*rkeyllc));
rkeyllc->hd.common.type = SMC_LLC_CONFIRM_RKEY;
rkeyllc->hd.length = sizeof(struct smc_llc_msg_confirm_rkey);
rtok_ix = 1;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
link = &send_link->lgr->lnk[i];
if (smc_link_active(link) && link != send_link) {
rkeyllc->rtoken[rtok_ix].link_id = link->link_id;
rkeyllc->rtoken[rtok_ix].rmb_key =
htonl(rmb_desc->mr_rx[link->link_idx]->rkey);
rkeyllc->rtoken[rtok_ix].rmb_vaddr = cpu_to_be64(
(u64)sg_dma_address(
rmb_desc->sgt[link->link_idx].sgl));
rtok_ix++;
}
}
/* rkey of send_link is in rtoken[0] */
rkeyllc->rtoken[0].num_rkeys = rtok_ix - 1;
rkeyllc->rtoken[0].rmb_key =
htonl(rmb_desc->mr_rx[send_link->link_idx]->rkey);
rkeyllc->rtoken[0].rmb_vaddr = cpu_to_be64(
(u64)sg_dma_address(rmb_desc->sgt[send_link->link_idx].sgl));
/* send llc message */
rc = smc_wr_tx_send(send_link, pend);
return rc;
}
/* send LLC delete rkey request */
static int smc_llc_send_delete_rkey(struct smc_link *link,
struct smc_buf_desc *rmb_desc)
{
struct smc_llc_msg_delete_rkey *rkeyllc;
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;
rkeyllc = (struct smc_llc_msg_delete_rkey *)wr_buf;
memset(rkeyllc, 0, sizeof(*rkeyllc));
rkeyllc->hd.common.type = SMC_LLC_DELETE_RKEY;
rkeyllc->hd.length = sizeof(struct smc_llc_msg_delete_rkey);
rkeyllc->num_rkeys = 1;
rkeyllc->rkey[0] = htonl(rmb_desc->mr_rx[link->link_idx]->rkey);
/* 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[], u8 gid[],
struct smc_link *link_new,
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;
memcpy(addllc->sender_mac, mac, ETH_ALEN);
memcpy(addllc->sender_gid, gid, SMC_GID_SIZE);
if (link_new) {
addllc->link_num = link_new->link_id;
hton24(addllc->sender_qp_num, link_new->roce_qp->qp_num);
hton24(addllc->initial_psn, link_new->psn_initial);
if (reqresp == SMC_LLC_REQ)
addllc->qp_mtu = link_new->path_mtu;
else
addllc->qp_mtu = min(link_new->path_mtu,
link_new->peer_mtu);
}
/* 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, u8 link_del_id,
enum smc_llc_reqresp reqresp, bool orderly,
u32 reason)
{
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_del_link);
if (reqresp == SMC_LLC_RESP)
delllc->hd.flags |= SMC_LLC_FLAG_RESP;
if (orderly)
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
if (link_del_id)
delllc->link_num = link_del_id;
else
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
delllc->reason = htonl(reason);
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
/* send LLC test link request */
static int smc_llc_send_test_link(struct smc_link *link, u8 user_data[16])
{
struct smc_llc_msg_test_link *testllc;
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;
testllc = (struct smc_llc_msg_test_link *)wr_buf;
memset(testllc, 0, sizeof(*testllc));
testllc->hd.common.type = SMC_LLC_TEST_LINK;
testllc->hd.length = sizeof(struct smc_llc_msg_test_link);
memcpy(testllc->user_data, user_data, sizeof(testllc->user_data));
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
/* schedule an llc send on link, may wait for buffers */
static int smc_llc_send_message(struct smc_link *link, void *llcbuf)
{
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
int rc;
if (!smc_link_usable(link))
return -ENOLINK;
rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
if (rc)
return rc;
memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg));
return smc_wr_tx_send(link, pend);
}
/* schedule an llc send on link, may wait for buffers,
* and wait for send completion notification.
* @return 0 on success
*/
static int smc_llc_send_message_wait(struct smc_link *link, void *llcbuf)
{
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
int rc;
if (!smc_link_usable(link))
return -ENOLINK;
rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
if (rc)
return rc;
memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg));
return smc_wr_tx_send_wait(link, pend, SMC_LLC_WAIT_TIME);
}
/********************************* receive ***********************************/
static int smc_llc_alloc_alt_link(struct smc_link_group *lgr,
enum smc_lgr_type lgr_new_t)
{
int i;
if (lgr->type == SMC_LGR_SYMMETRIC ||
(lgr->type != SMC_LGR_SINGLE &&
(lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)))
return -EMLINK;
if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
lgr_new_t == SMC_LGR_ASYMMETRIC_PEER) {
for (i = SMC_LINKS_PER_LGR_MAX - 1; i >= 0; i--)
if (lgr->lnk[i].state == SMC_LNK_UNUSED)
return i;
} else {
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
if (lgr->lnk[i].state == SMC_LNK_UNUSED)
return i;
}
return -EMLINK;
}
/* return first buffer from any of the next buf lists */
static struct smc_buf_desc *_smc_llc_get_next_rmb(struct smc_link_group *lgr,
int *buf_lst)
{
struct smc_buf_desc *buf_pos;
while (*buf_lst < SMC_RMBE_SIZES) {
buf_pos = list_first_entry_or_null(&lgr->rmbs[*buf_lst],
struct smc_buf_desc, list);
if (buf_pos)
return buf_pos;
(*buf_lst)++;
}
return NULL;
}
/* return next rmb from buffer lists */
static struct smc_buf_desc *smc_llc_get_next_rmb(struct smc_link_group *lgr,
int *buf_lst,
struct smc_buf_desc *buf_pos)
{
struct smc_buf_desc *buf_next;
if (!buf_pos || list_is_last(&buf_pos->list, &lgr->rmbs[*buf_lst])) {
(*buf_lst)++;
return _smc_llc_get_next_rmb(lgr, buf_lst);
}
buf_next = list_next_entry(buf_pos, list);
return buf_next;
}
static struct smc_buf_desc *smc_llc_get_first_rmb(struct smc_link_group *lgr,
int *buf_lst)
{
*buf_lst = 0;
return smc_llc_get_next_rmb(lgr, buf_lst, NULL);
}
/* send one add_link_continue msg */
static int smc_llc_add_link_cont(struct smc_link *link,
struct smc_link *link_new, u8 *num_rkeys_todo,
int *buf_lst, struct smc_buf_desc **buf_pos)
{
struct smc_llc_msg_add_link_cont *addc_llc;
struct smc_link_group *lgr = link->lgr;
int prim_lnk_idx, lnk_idx, i, rc;
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
struct smc_buf_desc *rmb;
u8 n;
rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
if (rc)
return rc;
addc_llc = (struct smc_llc_msg_add_link_cont *)wr_buf;
memset(addc_llc, 0, sizeof(*addc_llc));
prim_lnk_idx = link->link_idx;
lnk_idx = link_new->link_idx;
addc_llc->link_num = link_new->link_id;
addc_llc->num_rkeys = *num_rkeys_todo;
n = *num_rkeys_todo;
for (i = 0; i < min_t(u8, n, SMC_LLC_RKEYS_PER_CONT_MSG); i++) {
if (!*buf_pos) {
addc_llc->num_rkeys = addc_llc->num_rkeys -
*num_rkeys_todo;
*num_rkeys_todo = 0;
break;
}
rmb = *buf_pos;
addc_llc->rt[i].rmb_key = htonl(rmb->mr_rx[prim_lnk_idx]->rkey);
addc_llc->rt[i].rmb_key_new = htonl(rmb->mr_rx[lnk_idx]->rkey);
addc_llc->rt[i].rmb_vaddr_new =
cpu_to_be64((u64)sg_dma_address(rmb->sgt[lnk_idx].sgl));
(*num_rkeys_todo)--;
*buf_pos = smc_llc_get_next_rmb(lgr, buf_lst, *buf_pos);
while (*buf_pos && !(*buf_pos)->used)
*buf_pos = smc_llc_get_next_rmb(lgr, buf_lst, *buf_pos);
}
addc_llc->hd.common.type = SMC_LLC_ADD_LINK_CONT;
addc_llc->hd.length = sizeof(struct smc_llc_msg_add_link_cont);
if (lgr->role == SMC_CLNT)
addc_llc->hd.flags |= SMC_LLC_FLAG_RESP;
return smc_wr_tx_send(link, pend);
}
static int smc_llc_cli_rkey_exchange(struct smc_link *link,
struct smc_link *link_new)
{
struct smc_llc_msg_add_link_cont *addc_llc;
struct smc_link_group *lgr = link->lgr;
u8 max, num_rkeys_send, num_rkeys_recv;
struct smc_llc_qentry *qentry;
struct smc_buf_desc *buf_pos;
int buf_lst;
int rc = 0;
int i;
mutex_lock(&lgr->rmbs_lock);
num_rkeys_send = lgr->conns_num;
buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst);
do {
qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_TIME,
SMC_LLC_ADD_LINK_CONT);
if (!qentry) {
rc = -ETIMEDOUT;
break;
}
addc_llc = &qentry->msg.add_link_cont;
num_rkeys_recv = addc_llc->num_rkeys;
max = min_t(u8, num_rkeys_recv, SMC_LLC_RKEYS_PER_CONT_MSG);
for (i = 0; i < max; i++) {
smc_rtoken_set(lgr, link->link_idx, link_new->link_idx,
addc_llc->rt[i].rmb_key,
addc_llc->rt[i].rmb_vaddr_new,
addc_llc->rt[i].rmb_key_new);
num_rkeys_recv--;
}
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
rc = smc_llc_add_link_cont(link, link_new, &num_rkeys_send,
&buf_lst, &buf_pos);
if (rc)
break;
} while (num_rkeys_send || num_rkeys_recv);
mutex_unlock(&lgr->rmbs_lock);
return rc;
}
/* prepare and send an add link reject response */
static int smc_llc_cli_add_link_reject(struct smc_llc_qentry *qentry)
{
qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_ADD_LNK_REJ;
qentry->msg.raw.hdr.add_link_rej_rsn = SMC_LLC_REJ_RSN_NO_ALT_PATH;
return smc_llc_send_message(qentry->link, &qentry->msg);
}
static int smc_llc_cli_conf_link(struct smc_link *link,
struct smc_init_info *ini,
struct smc_link *link_new,
enum smc_lgr_type lgr_new_t)
{
struct smc_link_group *lgr = link->lgr;
struct smc_llc_qentry *qentry = NULL;
int rc = 0;
/* receive CONFIRM LINK request over RoCE fabric */
qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_FIRST_TIME, 0);
if (!qentry) {
rc = smc_llc_send_delete_link(link, link_new->link_id,
SMC_LLC_REQ, false,
SMC_LLC_DEL_LOST_PATH);
return -ENOLINK;
}
if (qentry->msg.raw.hdr.common.type != SMC_LLC_CONFIRM_LINK) {
/* received DELETE_LINK instead */
qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, &qentry->msg);
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
return -ENOLINK;
}
smc_llc_save_peer_uid(qentry);
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
rc = smc_ib_modify_qp_rts(link_new);
if (rc) {
smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
false, SMC_LLC_DEL_LOST_PATH);
return -ENOLINK;
}
smc_wr_remember_qp_attr(link_new);
rc = smcr_buf_reg_lgr(link_new);
if (rc) {
smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
false, SMC_LLC_DEL_LOST_PATH);
return -ENOLINK;
}
/* send CONFIRM LINK response over RoCE fabric */
rc = smc_llc_send_confirm_link(link_new, SMC_LLC_RESP);
if (rc) {
smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
false, SMC_LLC_DEL_LOST_PATH);
return -ENOLINK;
}
smc_llc_link_active(link_new);
if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)
smcr_lgr_set_type_asym(lgr, lgr_new_t, link_new->link_idx);
else
smcr_lgr_set_type(lgr, lgr_new_t);
return 0;
}
static void smc_llc_save_add_link_info(struct smc_link *link,
struct smc_llc_msg_add_link *add_llc)
{
link->peer_qpn = ntoh24(add_llc->sender_qp_num);
memcpy(link->peer_gid, add_llc->sender_gid, SMC_GID_SIZE);
memcpy(link->peer_mac, add_llc->sender_mac, ETH_ALEN);
link->peer_psn = ntoh24(add_llc->initial_psn);
link->peer_mtu = add_llc->qp_mtu;
}
/* as an SMC client, process an add link request */
int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
{
struct smc_llc_msg_add_link *llc = &qentry->msg.add_link;
enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
struct smc_link_group *lgr = smc_get_lgr(link);
struct smc_link *lnk_new = NULL;
struct smc_init_info ini;
int lnk_idx, rc = 0;
ini.vlan_id = lgr->vlan_id;
smc_pnet_find_alt_roce(lgr, &ini, link->smcibdev);
if (!memcmp(llc->sender_gid, link->peer_gid, SMC_GID_SIZE) &&
!memcmp(llc->sender_mac, link->peer_mac, ETH_ALEN)) {
if (!ini.ib_dev)
goto out_reject;
lgr_new_t = SMC_LGR_ASYMMETRIC_PEER;
}
if (!ini.ib_dev) {
lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
ini.ib_dev = link->smcibdev;
ini.ib_port = link->ibport;
}
lnk_idx = smc_llc_alloc_alt_link(lgr, lgr_new_t);
if (lnk_idx < 0)
goto out_reject;
lnk_new = &lgr->lnk[lnk_idx];
rc = smcr_link_init(lgr, lnk_new, lnk_idx, &ini);
if (rc)
goto out_reject;
smc_llc_save_add_link_info(lnk_new, llc);
lnk_new->link_id = llc->link_num; /* SMC server assigns link id */
smc_llc_link_set_uid(lnk_new);
rc = smc_ib_ready_link(lnk_new);
if (rc)
goto out_clear_lnk;
rc = smcr_buf_map_lgr(lnk_new);
if (rc)
goto out_clear_lnk;
rc = smc_llc_send_add_link(link,
lnk_new->smcibdev->mac[ini.ib_port - 1],
lnk_new->gid, lnk_new, SMC_LLC_RESP);
if (rc)
goto out_clear_lnk;
rc = smc_llc_cli_rkey_exchange(link, lnk_new);
if (rc) {
rc = 0;
goto out_clear_lnk;
}
rc = smc_llc_cli_conf_link(link, &ini, lnk_new, lgr_new_t);
if (!rc)
goto out;
out_clear_lnk:
smcr_link_clear(lnk_new, false);
out_reject:
smc_llc_cli_add_link_reject(qentry);
out:
kfree(qentry);
return rc;
}
/* as an SMC client, invite server to start the add_link processing */
static void smc_llc_cli_add_link_invite(struct smc_link *link,
struct smc_llc_qentry *qentry)
{
struct smc_link_group *lgr = smc_get_lgr(link);
struct smc_init_info ini;
if (lgr->type == SMC_LGR_SYMMETRIC ||
lgr->type == SMC_LGR_ASYMMETRIC_PEER)
goto out;
ini.vlan_id = lgr->vlan_id;
smc_pnet_find_alt_roce(lgr, &ini, link->smcibdev);
if (!ini.ib_dev)
goto out;
smc_llc_send_add_link(link, ini.ib_dev->mac[ini.ib_port - 1],
ini.ib_gid, NULL, SMC_LLC_REQ);
out:
kfree(qentry);
}
static bool smc_llc_is_local_add_link(union smc_llc_msg *llc)
{
if (llc->raw.hdr.common.type == SMC_LLC_ADD_LINK &&
!llc->add_link.qp_mtu && !llc->add_link.link_num)
return true;
return false;
}
static void smc_llc_process_cli_add_link(struct smc_link_group *lgr)
{
struct smc_llc_qentry *qentry;
qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
mutex_lock(&lgr->llc_conf_mutex);
if (smc_llc_is_local_add_link(&qentry->msg))
smc_llc_cli_add_link_invite(qentry->link, qentry);
else
smc_llc_cli_add_link(qentry->link, qentry);
mutex_unlock(&lgr->llc_conf_mutex);
}
static int smc_llc_active_link_count(struct smc_link_group *lgr)
{
int i, link_count = 0;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (!smc_link_active(&lgr->lnk[i]))
continue;
link_count++;
}
return link_count;
}
/* find the asymmetric link when 3 links are established */
static struct smc_link *smc_llc_find_asym_link(struct smc_link_group *lgr)
{
int asym_idx = -ENOENT;
int i, j, k;
bool found;
/* determine asymmetric link */
found = false;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
if (!smc_link_usable(&lgr->lnk[i]) ||
!smc_link_usable(&lgr->lnk[j]))
continue;
if (!memcmp(lgr->lnk[i].gid, lgr->lnk[j].gid,
SMC_GID_SIZE)) {
found = true; /* asym_lnk is i or j */
break;
}
}
if (found)
break;
}
if (!found)
goto out; /* no asymmetric link */
for (k = 0; k < SMC_LINKS_PER_LGR_MAX; k++) {
if (!smc_link_usable(&lgr->lnk[k]))
continue;
if (k != i &&
!memcmp(lgr->lnk[i].peer_gid, lgr->lnk[k].peer_gid,
SMC_GID_SIZE)) {
asym_idx = i;
break;
}
if (k != j &&
!memcmp(lgr->lnk[j].peer_gid, lgr->lnk[k].peer_gid,
SMC_GID_SIZE)) {
asym_idx = j;
break;
}
}
out:
return (asym_idx < 0) ? NULL : &lgr->lnk[asym_idx];
}
static void smc_llc_delete_asym_link(struct smc_link_group *lgr)
{