mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
2340 lines
64 KiB
2340 lines
64 KiB
// 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; |
|
union { |
|
struct { |
|
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 |
|
}; |
|
u16 length_v2; /* 44 - 8192*/ |
|
}; |
|
u8 flags; |
|
} __packed; /* format defined in |
|
* IBM Shared Memory Communications Version 2 |
|
* (https://www.ibm.com/support/pages/node/6326337) |
|
*/ |
|
|
|
#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; |
|
}; |
|
|
|
struct smc_llc_msg_add_link_v2_ext { |
|
#if defined(__BIG_ENDIAN_BITFIELD) |
|
u8 v2_direct : 1, |
|
reserved : 7; |
|
#elif defined(__LITTLE_ENDIAN_BITFIELD) |
|
u8 reserved : 7, |
|
v2_direct : 1; |
|
#endif |
|
u8 reserved2; |
|
u8 client_target_gid[SMC_GID_SIZE]; |
|
u8 reserved3[8]; |
|
u16 num_rkeys; |
|
struct smc_llc_msg_add_link_cont_rt rt[]; |
|
} __packed; /* format defined in |
|
* IBM Shared Memory Communications Version 2 |
|
* (https://www.ibm.com/support/pages/node/6326337) |
|
*/ |
|
|
|
struct smc_llc_msg_req_add_link_v2 { |
|
struct smc_llc_hdr hd; |
|
u8 reserved[20]; |
|
u8 gid_cnt; |
|
u8 reserved2[3]; |
|
u8 gid[][SMC_GID_SIZE]; |
|
}; |
|
|
|
#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 |
|
#define SMC_LLC_RKEYS_PER_MSG_V2 255 |
|
|
|
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]; |
|
}; |
|
|
|
struct smc_llc_msg_delete_rkey_v2 { /* type 0x29 */ |
|
struct smc_llc_hdr hd; |
|
u8 num_rkeys; |
|
u8 num_inval_rkeys; |
|
u8 reserved[2]; |
|
__be32 rkey[]; |
|
}; |
|
|
|
union smc_llc_msg { |
|
struct smc_llc_msg_confirm_link confirm_link; |
|
struct smc_llc_msg_add_link add_link; |
|
struct smc_llc_msg_req_add_link_v2 req_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.llc_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 net %llu dropped parallel " |
|
"LLC msg: msg %d flow %d role %d\n", |
|
SMC_LGR_ID_SIZE, &lgr->id, |
|
lgr->net->net_cookie, |
|
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.llc_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; |
|
} |
|
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.llc_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 net %llu dropped unexpected LLC msg: " |
|
"msg %d exp %d flow %d role %d flags %x\n", |
|
SMC_LGR_ID_SIZE, &lgr->id, lgr->net->net_cookie, |
|
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; |
|
} |
|
|
|
static int smc_llc_add_pending_send_v2(struct smc_link *link, |
|
struct smc_wr_v2_buf **wr_buf, |
|
struct smc_wr_tx_pend_priv **pend) |
|
{ |
|
int rc; |
|
|
|
rc = smc_wr_tx_get_v2_slot(link, smc_llc_tx_handler, wr_buf, pend); |
|
if (rc < 0) |
|
return rc; |
|
return 0; |
|
} |
|
|
|
static void smc_llc_init_msg_hdr(struct smc_llc_hdr *hdr, |
|
struct smc_link_group *lgr, size_t len) |
|
{ |
|
if (lgr->smc_version == SMC_V2) { |
|
hdr->common.llc_version = SMC_V2; |
|
hdr->length_v2 = len; |
|
} else { |
|
hdr->common.llc_version = 0; |
|
hdr->length = len; |
|
} |
|
} |
|
|
|
/* 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; |
|
|
|
if (!smc_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
confllc = (struct smc_llc_msg_confirm_link *)wr_buf; |
|
memset(confllc, 0, sizeof(*confllc)); |
|
confllc->hd.common.llc_type = SMC_LLC_CONFIRM_LINK; |
|
smc_llc_init_msg_hdr(&confllc->hd, link->lgr, sizeof(*confllc)); |
|
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); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
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; |
|
|
|
if (!smc_wr_tx_link_hold(send_link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(send_link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
rkeyllc = (struct smc_llc_msg_confirm_rkey *)wr_buf; |
|
memset(rkeyllc, 0, sizeof(*rkeyllc)); |
|
rkeyllc->hd.common.llc_type = SMC_LLC_CONFIRM_RKEY; |
|
smc_llc_init_msg_hdr(&rkeyllc->hd, send_link->lgr, sizeof(*rkeyllc)); |
|
|
|
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); |
|
put_out: |
|
smc_wr_tx_link_put(send_link); |
|
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; |
|
|
|
if (!smc_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
rkeyllc = (struct smc_llc_msg_delete_rkey *)wr_buf; |
|
memset(rkeyllc, 0, sizeof(*rkeyllc)); |
|
rkeyllc->hd.common.llc_type = SMC_LLC_DELETE_RKEY; |
|
smc_llc_init_msg_hdr(&rkeyllc->hd, link->lgr, sizeof(*rkeyllc)); |
|
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); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
return rc; |
|
} |
|
|
|
/* 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); |
|
} |
|
|
|
static int smc_llc_fill_ext_v2(struct smc_llc_msg_add_link_v2_ext *ext, |
|
struct smc_link *link, struct smc_link *link_new) |
|
{ |
|
struct smc_link_group *lgr = link->lgr; |
|
struct smc_buf_desc *buf_pos; |
|
int prim_lnk_idx, lnk_idx, i; |
|
struct smc_buf_desc *rmb; |
|
int len = sizeof(*ext); |
|
int buf_lst; |
|
|
|
ext->v2_direct = !lgr->uses_gateway; |
|
memcpy(ext->client_target_gid, link_new->gid, SMC_GID_SIZE); |
|
|
|
prim_lnk_idx = link->link_idx; |
|
lnk_idx = link_new->link_idx; |
|
mutex_lock(&lgr->rmbs_lock); |
|
ext->num_rkeys = lgr->conns_num; |
|
if (!ext->num_rkeys) |
|
goto out; |
|
buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst); |
|
for (i = 0; i < ext->num_rkeys; i++) { |
|
if (!buf_pos) |
|
break; |
|
rmb = buf_pos; |
|
ext->rt[i].rmb_key = htonl(rmb->mr_rx[prim_lnk_idx]->rkey); |
|
ext->rt[i].rmb_key_new = htonl(rmb->mr_rx[lnk_idx]->rkey); |
|
ext->rt[i].rmb_vaddr_new = |
|
cpu_to_be64((u64)sg_dma_address(rmb->sgt[lnk_idx].sgl)); |
|
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); |
|
} |
|
len += i * sizeof(ext->rt[0]); |
|
out: |
|
mutex_unlock(&lgr->rmbs_lock); |
|
return len; |
|
} |
|
|
|
/* 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_v2_ext *ext = NULL; |
|
struct smc_llc_msg_add_link *addllc; |
|
struct smc_wr_tx_pend_priv *pend; |
|
int len = sizeof(*addllc); |
|
int rc; |
|
|
|
if (!smc_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
if (link->lgr->smc_version == SMC_V2) { |
|
struct smc_wr_v2_buf *wr_buf; |
|
|
|
rc = smc_llc_add_pending_send_v2(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
addllc = (struct smc_llc_msg_add_link *)wr_buf; |
|
ext = (struct smc_llc_msg_add_link_v2_ext *) |
|
&wr_buf->raw[sizeof(*addllc)]; |
|
memset(ext, 0, SMC_WR_TX_SIZE); |
|
} else { |
|
struct smc_wr_buf *wr_buf; |
|
|
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
addllc = (struct smc_llc_msg_add_link *)wr_buf; |
|
} |
|
|
|
memset(addllc, 0, sizeof(*addllc)); |
|
addllc->hd.common.llc_type = SMC_LLC_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); |
|
} |
|
if (ext && link_new) |
|
len += smc_llc_fill_ext_v2(ext, link, link_new); |
|
smc_llc_init_msg_hdr(&addllc->hd, link->lgr, len); |
|
/* send llc message */ |
|
if (link->lgr->smc_version == SMC_V2) |
|
rc = smc_wr_tx_v2_send(link, pend, len); |
|
else |
|
rc = smc_wr_tx_send(link, pend); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
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; |
|
|
|
if (!smc_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
delllc = (struct smc_llc_msg_del_link *)wr_buf; |
|
|
|
memset(delllc, 0, sizeof(*delllc)); |
|
delllc->hd.common.llc_type = SMC_LLC_DELETE_LINK; |
|
smc_llc_init_msg_hdr(&delllc->hd, link->lgr, sizeof(*delllc)); |
|
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); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
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; |
|
|
|
if (!smc_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
testllc = (struct smc_llc_msg_test_link *)wr_buf; |
|
memset(testllc, 0, sizeof(*testllc)); |
|
testllc->hd.common.llc_type = SMC_LLC_TEST_LINK; |
|
smc_llc_init_msg_hdr(&testllc->hd, link->lgr, sizeof(*testllc)); |
|
memcpy(testllc->user_data, user_data, sizeof(testllc->user_data)); |
|
/* send llc message */ |
|
rc = smc_wr_tx_send(link, pend); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
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_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg)); |
|
rc = smc_wr_tx_send(link, pend); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
return rc; |
|
} |
|
|
|
/* 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_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg)); |
|
rc = smc_wr_tx_send_wait(link, pend, SMC_LLC_WAIT_TIME); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
return rc; |
|
} |
|
|
|
/********************************* 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; |
|
} |
|
|
|
/* 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; |
|
|
|
if (!smc_wr_tx_link_hold(link)) |
|
return -ENOLINK; |
|
rc = smc_llc_add_pending_send(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
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.llc_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; |
|
rc = smc_wr_tx_send(link, pend); |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
return rc; |
|
} |
|
|
|
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; |
|
smc_llc_init_msg_hdr(&qentry->msg.raw.hdr, qentry->link->lgr, |
|
sizeof(qentry->msg)); |
|
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.llc_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_rkeys(struct smc_link *link, |
|
struct smc_link *link_new) |
|
{ |
|
struct smc_llc_msg_add_link_v2_ext *ext; |
|
struct smc_link_group *lgr = link->lgr; |
|
int max, i; |
|
|
|
ext = (struct smc_llc_msg_add_link_v2_ext *)((u8 *)lgr->wr_rx_buf_v2 + |
|
SMC_WR_TX_SIZE); |
|
max = min_t(u8, ext->num_rkeys, SMC_LLC_RKEYS_PER_MSG_V2); |
|
mutex_lock(&lgr->rmbs_lock); |
|
for (i = 0; i < max; i++) { |
|
smc_rtoken_set(lgr, link->link_idx, link_new->link_idx, |
|
ext->rt[i].rmb_key, |
|
ext->rt[i].rmb_vaddr_new, |
|
ext->rt[i].rmb_key_new); |
|
} |
|
mutex_unlock(&lgr->rmbs_lock); |
|
} |
|
|
|
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_init_info *ini = NULL; |
|
struct smc_link *lnk_new = NULL; |
|
int lnk_idx, rc = 0; |
|
|
|
if (!llc->qp_mtu) |
|
goto out_reject; |
|
|
|
ini = kzalloc(sizeof(*ini), GFP_KERNEL); |
|
if (!ini) { |
|
rc = -ENOMEM; |
|
goto out_reject; |
|
} |
|
|
|
ini->vlan_id = lgr->vlan_id; |
|
if (lgr->smc_version == SMC_V2) { |
|
ini->check_smcrv2 = true; |
|
ini->smcrv2.saddr = lgr->saddr; |
|
ini->smcrv2.daddr = smc_ib_gid_to_ipv4(llc->sender_gid); |
|
} |
|
smc_pnet_find_alt_roce(lgr, ini, link->smcibdev); |
|
if (!memcmp(llc->sender_gid, link->peer_gid, SMC_GID_SIZE) && |
|
(lgr->smc_version == SMC_V2 || |
|
!memcmp(llc->sender_mac, link->peer_mac, ETH_ALEN))) { |
|
if (!ini->ib_dev && !ini->smcrv2.ib_dev_v2) |
|
goto out_reject; |
|
lgr_new_t = SMC_LGR_ASYMMETRIC_PEER; |
|
} |
|
if (lgr->smc_version == SMC_V2 && !ini->smcrv2.ib_dev_v2) { |
|
lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL; |
|
ini->smcrv2.ib_dev_v2 = link->smcibdev; |
|
ini->smcrv2.ib_port_v2 = link->ibport; |
|
} else if (lgr->smc_version < SMC_V2 && !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[lnk_new->ibport - 1], |
|
lnk_new->gid, lnk_new, SMC_LLC_RESP); |
|
if (rc) |
|
goto out_clear_lnk; |
|
if (lgr->smc_version == SMC_V2) { |
|
smc_llc_save_add_link_rkeys(link, lnk_new); |
|
} else { |
|
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: |
|
lnk_new->state = SMC_LNK_INACTIVE; |
|
smcr_link_clear(lnk_new, false); |
|
out_reject: |
|
smc_llc_cli_add_link_reject(qentry); |
|
out: |
|
kfree(ini); |
|
kfree(qentry); |
|
return rc; |
|
} |
|
|
|
static void smc_llc_send_request_add_link(struct smc_link *link) |
|
{ |
|
struct smc_llc_msg_req_add_link_v2 *llc; |
|
struct smc_wr_tx_pend_priv *pend; |
|
struct smc_wr_v2_buf *wr_buf; |
|
struct smc_gidlist gidlist; |
|
int rc, len, i; |
|
|
|
if (!smc_wr_tx_link_hold(link)) |
|
return; |
|
if (link->lgr->type == SMC_LGR_SYMMETRIC || |
|
link->lgr->type == SMC_LGR_ASYMMETRIC_PEER) |
|
goto put_out; |
|
|
|
smc_fill_gid_list(link->lgr, &gidlist, link->smcibdev, link->gid); |
|
if (gidlist.len <= 1) |
|
goto put_out; |
|
|
|
rc = smc_llc_add_pending_send_v2(link, &wr_buf, &pend); |
|
if (rc) |
|
goto put_out; |
|
llc = (struct smc_llc_msg_req_add_link_v2 *)wr_buf; |
|
memset(llc, 0, SMC_WR_TX_SIZE); |
|
|
|
llc->hd.common.llc_type = SMC_LLC_REQ_ADD_LINK; |
|
for (i = 0; i < gidlist.len; i++) |
|
memcpy(llc->gid[i], gidlist.list[i], sizeof(gidlist.list[0])); |
|
llc->gid_cnt = gidlist.len; |
|
len = sizeof(*llc) + (gidlist.len * sizeof(gidlist.list[0])); |
|
smc_llc_init_msg_hdr(&llc->hd, link->lgr, len); |
|
rc = smc_wr_tx_v2_send(link, pend, len); |
|
if (!rc) |
|
/* set REQ_ADD_LINK flow and wait for response from peer */ |
|
link->lgr->llc_flow_lcl.type = SMC_LLC_FLOW_REQ_ADD_LINK; |
|
put_out: |
|
smc_wr_tx_link_put(link); |
|
} |
|
|
|
/* 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 = NULL; |
|
|
|
if (lgr->smc_version == SMC_V2) { |
|
smc_llc_send_request_add_link(link); |
|
goto out; |
|
} |
|
|
|
if (lgr->type == SMC_LGR_SYMMETRIC || |
|
lgr->type == SMC_LGR_ASYMMETRIC_PEER) |
|
goto out; |
|
|
|
ini = kzalloc(sizeof(*ini), GFP_KERNEL); |
|
if (!ini) |
|
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(ini); |
|
kfree(qentry); |
|
} |
|
|
|
static bool smc_llc_is_empty_llc_message(union smc_llc_msg *llc) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(llc->raw.data); i++) |
|
if (llc->raw.data[i]) |
|
return false; |
|
return true; |
|
} |
|
|
|
static bool smc_llc_is_local_add_link(union smc_llc_msg *llc) |
|
{ |
|
if (llc->raw.hdr.common.llc_type == SMC_LLC_ADD_LINK && |
|
smc_llc_is_empty_llc_message(llc)) |
|
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) |
|
{ |
|
struct smc_link *lnk_new = NULL, *lnk_asym; |
|
struct smc_llc_qentry *qentry; |
|
int rc; |
|
|
|
lnk_asym = smc_llc_find_asym_link(lgr); |
|
if (!lnk_asym) |
|
return; /* no asymmetric link */ |
|
if (!smc_link_downing(&lnk_asym->state)) |
|
return; |
|
lnk_new = smc_switch_conns(lgr, lnk_asym, false); |
|
smc_wr_tx_wait_no_pending_sends(lnk_asym); |
|
if (!lnk_new) |
|
goto out_free; |
|
/* change flow type from ADD_LINK into DEL_LINK */ |
|
lgr->llc_flow_lcl.type = SMC_LLC_FLOW_DEL_LINK; |
|
rc = smc_llc_send_delete_link(lnk_new, lnk_asym->link_id, SMC_LLC_REQ, |
|
true, SMC_LLC_DEL_NO_ASYM_NEEDED); |
|
if (rc) { |
|
smcr_link_down_cond(lnk_new); |
|
goto out_free; |
|
} |
|
qentry = smc_llc_wait(lgr, lnk_new, SMC_LLC_WAIT_TIME, |
|
SMC_LLC_DELETE_LINK); |
|
if (!qentry) { |
|
smcr_link_down_cond(lnk_new); |
|
goto out_free; |
|
} |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
out_free: |
|
smcr_link_clear(lnk_asym, true); |
|
} |
|
|
|
static int smc_llc_srv_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 = NULL; |
|
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 { |
|
smc_llc_add_link_cont(link, link_new, &num_rkeys_send, |
|
&buf_lst, &buf_pos); |
|
qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_TIME, |
|
SMC_LLC_ADD_LINK_CONT); |
|
if (!qentry) { |
|
rc = -ETIMEDOUT; |
|
goto out; |
|
} |
|
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); |
|
} while (num_rkeys_send || num_rkeys_recv); |
|
out: |
|
mutex_unlock(&lgr->rmbs_lock); |
|
return rc; |
|
} |
|
|
|
static int smc_llc_srv_conf_link(struct smc_link *link, |
|
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; |
|
|
|
/* send CONFIRM LINK request over the RoCE fabric */ |
|
rc = smc_llc_send_confirm_link(link_new, SMC_LLC_REQ); |
|
if (rc) |
|
return -ENOLINK; |
|
/* receive CONFIRM LINK response over the RoCE fabric */ |
|
qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_FIRST_TIME, 0); |
|
if (!qentry || |
|
qentry->msg.raw.hdr.common.llc_type != SMC_LLC_CONFIRM_LINK) { |
|
/* send DELETE LINK */ |
|
smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ, |
|
false, SMC_LLC_DEL_LOST_PATH); |
|
if (qentry) |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
return -ENOLINK; |
|
} |
|
smc_llc_save_peer_uid(qentry); |
|
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); |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
return 0; |
|
} |
|
|
|
static void smc_llc_send_req_add_link_response(struct smc_llc_qentry *qentry) |
|
{ |
|
qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP; |
|
smc_llc_init_msg_hdr(&qentry->msg.raw.hdr, qentry->link->lgr, |
|
sizeof(qentry->msg)); |
|
memset(&qentry->msg.raw.data, 0, sizeof(qentry->msg.raw.data)); |
|
smc_llc_send_message(qentry->link, &qentry->msg); |
|
} |
|
|
|
int smc_llc_srv_add_link(struct smc_link *link, |
|
struct smc_llc_qentry *req_qentry) |
|
{ |
|
enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC; |
|
struct smc_link_group *lgr = link->lgr; |
|
struct smc_llc_msg_add_link *add_llc; |
|
struct smc_llc_qentry *qentry = NULL; |
|
bool send_req_add_link_resp = false; |
|
struct smc_link *link_new = NULL; |
|
struct smc_init_info *ini = NULL; |
|
int lnk_idx, rc = 0; |
|
|
|
if (req_qentry && |
|
req_qentry->msg.raw.hdr.common.llc_type == SMC_LLC_REQ_ADD_LINK) |
|
send_req_add_link_resp = true; |
|
|
|
ini = kzalloc(sizeof(*ini), GFP_KERNEL); |
|
if (!ini) { |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
/* ignore client add link recommendation, start new flow */ |
|
ini->vlan_id = lgr->vlan_id; |
|
if (lgr->smc_version == SMC_V2) { |
|
ini->check_smcrv2 = true; |
|
ini->smcrv2.saddr = lgr->saddr; |
|
if (send_req_add_link_resp) { |
|
struct smc_llc_msg_req_add_link_v2 *req_add = |
|
&req_qentry->msg.req_add_link; |
|
|
|
ini->smcrv2.daddr = smc_ib_gid_to_ipv4(req_add->gid[0]); |
|
} |
|
} |
|
smc_pnet_find_alt_roce(lgr, ini, link->smcibdev); |
|
if (lgr->smc_version == SMC_V2 && !ini->smcrv2.ib_dev_v2) { |
|
lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL; |
|
ini->smcrv2.ib_dev_v2 = link->smcibdev; |
|
ini->smcrv2.ib_port_v2 = link->ibport; |
|
} else if (lgr->smc_version < SMC_V2 && !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) { |
|
rc = 0; |
|
goto out; |
|
} |
|
|
|
rc = smcr_link_init(lgr, &lgr->lnk[lnk_idx], lnk_idx, ini); |
|
if (rc) |
|
goto out; |
|
link_new = &lgr->lnk[lnk_idx]; |
|
|
|
rc = smcr_buf_map_lgr(link_new); |
|
if (rc) |
|
goto out_err; |
|
|
|
rc = smc_llc_send_add_link(link, |
|
link_new->smcibdev->mac[link_new->ibport-1], |
|
link_new->gid, link_new, SMC_LLC_REQ); |
|
if (rc) |
|
goto out_err; |
|
send_req_add_link_resp = false; |
|
/* receive ADD LINK response over the RoCE fabric */ |
|
qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_TIME, SMC_LLC_ADD_LINK); |
|
if (!qentry) { |
|
rc = -ETIMEDOUT; |
|
goto out_err; |
|
} |
|
add_llc = &qentry->msg.add_link; |
|
if (add_llc->hd.flags & SMC_LLC_FLAG_ADD_LNK_REJ) { |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
rc = -ENOLINK; |
|
goto out_err; |
|
} |
|
if (lgr->type == SMC_LGR_SINGLE && |
|
(!memcmp(add_llc->sender_gid, link->peer_gid, SMC_GID_SIZE) && |
|
(lgr->smc_version == SMC_V2 || |
|
!memcmp(add_llc->sender_mac, link->peer_mac, ETH_ALEN)))) { |
|
lgr_new_t = SMC_LGR_ASYMMETRIC_PEER; |
|
} |
|
smc_llc_save_add_link_info(link_new, add_llc); |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
|
|
rc = smc_ib_ready_link(link_new); |
|
if (rc) |
|
goto out_err; |
|
rc = smcr_buf_reg_lgr(link_new); |
|
if (rc) |
|
goto out_err; |
|
if (lgr->smc_version == SMC_V2) { |
|
smc_llc_save_add_link_rkeys(link, link_new); |
|
} else { |
|
rc = smc_llc_srv_rkey_exchange(link, link_new); |
|
if (rc) |
|
goto out_err; |
|
} |
|
rc = smc_llc_srv_conf_link(link, link_new, lgr_new_t); |
|
if (rc) |
|
goto out_err; |
|
kfree(ini); |
|
return 0; |
|
out_err: |
|
if (link_new) { |
|
link_new->state = SMC_LNK_INACTIVE; |
|
smcr_link_clear(link_new, false); |
|
} |
|
out: |
|
kfree(ini); |
|
if (send_req_add_link_resp) |
|
smc_llc_send_req_add_link_response(req_qentry); |
|
return rc; |
|
} |
|
|
|
static void smc_llc_process_srv_add_link(struct smc_link_group *lgr) |
|
{ |
|
struct smc_link *link = lgr->llc_flow_lcl.qentry->link; |
|
struct smc_llc_qentry *qentry; |
|
int rc; |
|
|
|
qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl); |
|
|
|
mutex_lock(&lgr->llc_conf_mutex); |
|
rc = smc_llc_srv_add_link(link, qentry); |
|
if (!rc && lgr->type == SMC_LGR_SYMMETRIC) { |
|
/* delete any asymmetric link */ |
|
smc_llc_delete_asym_link(lgr); |
|
} |
|
mutex_unlock(&lgr->llc_conf_mutex); |
|
kfree(qentry); |
|
} |
|
|
|
/* enqueue a local add_link req to trigger a new add_link flow */ |
|
void smc_llc_add_link_local(struct smc_link *link) |
|
{ |
|
struct smc_llc_msg_add_link add_llc = {}; |
|
|
|
add_llc.hd.common.llc_type = SMC_LLC_ADD_LINK; |
|
smc_llc_init_msg_hdr(&add_llc.hd, link->lgr, sizeof(add_llc)); |
|
/* no dev and port needed */ |
|
smc_llc_enqueue(link, (union smc_llc_msg *)&add_llc); |
|
} |
|
|
|
/* worker to process an add link message */ |
|
static void smc_llc_add_link_work(struct work_struct *work) |
|
{ |
|
struct smc_link_group *lgr = container_of(work, struct smc_link_group, |
|
llc_add_link_work); |
|
|
|
if (list_empty(&lgr->list)) { |
|
/* link group is terminating */ |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
goto out; |
|
} |
|
|
|
if (lgr->role == SMC_CLNT) |
|
smc_llc_process_cli_add_link(lgr); |
|
else |
|
smc_llc_process_srv_add_link(lgr); |
|
out: |
|
if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_REQ_ADD_LINK) |
|
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); |
|
} |
|
|
|
/* enqueue a local del_link msg to trigger a new del_link flow, |
|
* called only for role SMC_SERV |
|
*/ |
|
void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id) |
|
{ |
|
struct smc_llc_msg_del_link del_llc = {}; |
|
|
|
del_llc.hd.common.llc_type = SMC_LLC_DELETE_LINK; |
|
smc_llc_init_msg_hdr(&del_llc.hd, link->lgr, sizeof(del_llc)); |
|
del_llc.link_num = del_link_id; |
|
del_llc.reason = htonl(SMC_LLC_DEL_LOST_PATH); |
|
del_llc.hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY; |
|
smc_llc_enqueue(link, (union smc_llc_msg *)&del_llc); |
|
} |
|
|
|
static void smc_llc_process_cli_delete_link(struct smc_link_group *lgr) |
|
{ |
|
struct smc_link *lnk_del = NULL, *lnk_asym, *lnk; |
|
struct smc_llc_msg_del_link *del_llc; |
|
struct smc_llc_qentry *qentry; |
|
int active_links; |
|
int lnk_idx; |
|
|
|
qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl); |
|
lnk = qentry->link; |
|
del_llc = &qentry->msg.delete_link; |
|
|
|
if (del_llc->hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) { |
|
smc_lgr_terminate_sched(lgr); |
|
goto out; |
|
} |
|
mutex_lock(&lgr->llc_conf_mutex); |
|
/* delete single link */ |
|
for (lnk_idx = 0; lnk_idx < SMC_LINKS_PER_LGR_MAX; lnk_idx++) { |
|
if (lgr->lnk[lnk_idx].link_id != del_llc->link_num) |
|
continue; |
|
lnk_del = &lgr->lnk[lnk_idx]; |
|
break; |
|
} |
|
del_llc->hd.flags |= SMC_LLC_FLAG_RESP; |
|
if (!lnk_del) { |
|
/* link was not found */ |
|
del_llc->reason = htonl(SMC_LLC_DEL_NOLNK); |
|
smc_llc_send_message(lnk, &qentry->msg); |
|
goto out_unlock; |
|
} |
|
lnk_asym = smc_llc_find_asym_link(lgr); |
|
|
|
del_llc->reason = 0; |
|
smc_llc_send_message(lnk, &qentry->msg); /* response */ |
|
|
|
if (smc_link_downing(&lnk_del->state)) |
|
smc_switch_conns(lgr, lnk_del, false); |
|
smcr_link_clear(lnk_del, true); |
|
|
|
active_links = smc_llc_active_link_count(lgr); |
|
if (lnk_del == lnk_asym) { |
|
/* expected deletion of asym link, don't change lgr state */ |
|
} else if (active_links == 1) { |
|
smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); |
|
} else if (!active_links) { |
|
smcr_lgr_set_type(lgr, SMC_LGR_NONE); |
|
smc_lgr_terminate_sched(lgr); |
|
} |
|
out_unlock: |
|
mutex_unlock(&lgr->llc_conf_mutex); |
|
out: |
|
kfree(qentry); |
|
} |
|
|
|
/* try to send a DELETE LINK ALL request on any active link, |
|
* waiting for send completion |
|
*/ |
|
void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord, u32 rsn) |
|
{ |
|
struct smc_llc_msg_del_link delllc = {}; |
|
int i; |
|
|
|
delllc.hd.common.llc_type = SMC_LLC_DELETE_LINK; |
|
smc_llc_init_msg_hdr(&delllc.hd, lgr, sizeof(delllc)); |
|
if (ord) |
|
delllc.hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY; |
|
delllc.hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL; |
|
delllc.reason = htonl(rsn); |
|
|
|
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { |
|
if (!smc_link_sendable(&lgr->lnk[i])) |
|
continue; |
|
if (!smc_llc_send_message_wait(&lgr->lnk[i], &delllc)) |
|
break; |
|
} |
|
} |
|
|
|
static void smc_llc_process_srv_delete_link(struct smc_link_group *lgr) |
|
{ |
|
struct smc_llc_msg_del_link *del_llc; |
|
struct smc_link *lnk, *lnk_del; |
|
struct smc_llc_qentry *qentry; |
|
int active_links; |
|
int i; |
|
|
|
mutex_lock(&lgr->llc_conf_mutex); |
|
qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl); |
|
lnk = qentry->link; |
|
del_llc = &qentry->msg.delete_link; |
|
|
|
if (qentry->msg.delete_link.hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) { |
|
/* delete entire lgr */ |
|
smc_llc_send_link_delete_all(lgr, true, ntohl( |
|
qentry->msg.delete_link.reason)); |
|
smc_lgr_terminate_sched(lgr); |
|
goto out; |
|
} |
|
/* delete single link */ |
|
lnk_del = NULL; |
|
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { |
|
if (lgr->lnk[i].link_id == del_llc->link_num) { |
|
lnk_del = &lgr->lnk[i]; |
|
break; |
|
} |
|
} |
|
if (!lnk_del) |
|
goto out; /* asymmetric link already deleted */ |
|
|
|
if (smc_link_downing(&lnk_del->state)) { |
|
if (smc_switch_conns(lgr, lnk_del, false)) |
|
smc_wr_tx_wait_no_pending_sends(lnk_del); |
|
} |
|
if (!list_empty(&lgr->list)) { |
|
/* qentry is either a request from peer (send it back to |
|
* initiate the DELETE_LINK processing), or a locally |
|
* enqueued DELETE_LINK request (forward it) |
|
*/ |
|
if (!smc_llc_send_message(lnk, &qentry->msg)) { |
|
struct smc_llc_qentry *qentry2; |
|
|
|
qentry2 = smc_llc_wait(lgr, lnk, SMC_LLC_WAIT_TIME, |
|
SMC_LLC_DELETE_LINK); |
|
if (qentry2) |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
} |
|
} |
|
smcr_link_clear(lnk_del, true); |
|
|
|
active_links = smc_llc_active_link_count(lgr); |
|
if (active_links == 1) { |
|
smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); |
|
} else if (!active_links) { |
|
smcr_lgr_set_type(lgr, SMC_LGR_NONE); |
|
smc_lgr_terminate_sched(lgr); |
|
} |
|
|
|
if (lgr->type == SMC_LGR_SINGLE && !list_empty(&lgr->list)) { |
|
/* trigger setup of asymm alt link */ |
|
smc_llc_add_link_local(lnk); |
|
} |
|
out: |
|
mutex_unlock(&lgr->llc_conf_mutex); |
|
kfree(qentry); |
|
} |
|
|
|
static void smc_llc_delete_link_work(struct work_struct *work) |
|
{ |
|
struct smc_link_group *lgr = container_of(work, struct smc_link_group, |
|
llc_del_link_work); |
|
|
|
if (list_empty(&lgr->list)) { |
|
/* link group is terminating */ |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
goto out; |
|
} |
|
|
|
if (lgr->role == SMC_CLNT) |
|
smc_llc_process_cli_delete_link(lgr); |
|
else |
|
smc_llc_process_srv_delete_link(lgr); |
|
out: |
|
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); |
|
} |
|
|
|
/* process a confirm_rkey request from peer, remote flow */ |
|
static void smc_llc_rmt_conf_rkey(struct smc_link_group *lgr) |
|
{ |
|
struct smc_llc_msg_confirm_rkey *llc; |
|
struct smc_llc_qentry *qentry; |
|
struct smc_link *link; |
|
int num_entries; |
|
int rk_idx; |
|
int i; |
|
|
|
qentry = lgr->llc_flow_rmt.qentry; |
|
llc = &qentry->msg.confirm_rkey; |
|
link = qentry->link; |
|
|
|
num_entries = llc->rtoken[0].num_rkeys; |
|
if (num_entries > SMC_LLC_RKEYS_PER_MSG) |
|
goto out_err; |
|
/* first rkey entry is for receiving link */ |
|
rk_idx = smc_rtoken_add(link, |
|
llc->rtoken[0].rmb_vaddr, |
|
llc->rtoken[0].rmb_key); |
|
if (rk_idx < 0) |
|
goto out_err; |
|
|
|
for (i = 1; i <= min_t(u8, num_entries, SMC_LLC_RKEYS_PER_MSG - 1); i++) |
|
smc_rtoken_set2(lgr, rk_idx, llc->rtoken[i].link_id, |
|
llc->rtoken[i].rmb_vaddr, |
|
llc->rtoken[i].rmb_key); |
|
/* max links is 3 so there is no need to support conf_rkey_cont msgs */ |
|
goto out; |
|
out_err: |
|
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG; |
|
llc->hd.flags |= SMC_LLC_FLAG_RKEY_RETRY; |
|
out: |
|
llc->hd.flags |= SMC_LLC_FLAG_RESP; |
|
smc_llc_init_msg_hdr(&llc->hd, link->lgr, sizeof(*llc)); |
|
smc_llc_send_message(link, &qentry->msg); |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_rmt); |
|
} |
|
|
|
/* process a delete_rkey request from peer, remote flow */ |
|
static void smc_llc_rmt_delete_rkey(struct smc_link_group *lgr) |
|
{ |
|
struct smc_llc_msg_delete_rkey *llc; |
|
struct smc_llc_qentry *qentry; |
|
struct smc_link *link; |
|
u8 err_mask = 0; |
|
int i, max; |
|
|
|
qentry = lgr->llc_flow_rmt.qentry; |
|
llc = &qentry->msg.delete_rkey; |
|
link = qentry->link; |
|
|
|
if (lgr->smc_version == SMC_V2) { |
|
struct smc_llc_msg_delete_rkey_v2 *llcv2; |
|
|
|
memcpy(lgr->wr_rx_buf_v2, llc, sizeof(*llc)); |
|
llcv2 = (struct smc_llc_msg_delete_rkey_v2 *)lgr->wr_rx_buf_v2; |
|
llcv2->num_inval_rkeys = 0; |
|
|
|
max = min_t(u8, llcv2->num_rkeys, SMC_LLC_RKEYS_PER_MSG_V2); |
|
for (i = 0; i < max; i++) { |
|
if (smc_rtoken_delete(link, llcv2->rkey[i])) |
|
llcv2->num_inval_rkeys++; |
|
} |
|
memset(&llc->rkey[0], 0, sizeof(llc->rkey)); |
|
memset(&llc->reserved2, 0, sizeof(llc->reserved2)); |
|
smc_llc_init_msg_hdr(&llc->hd, link->lgr, sizeof(*llc)); |
|
if (llcv2->num_inval_rkeys) { |
|
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG; |
|
llc->err_mask = llcv2->num_inval_rkeys; |
|
} |
|
goto finish; |
|
} |
|
|
|
max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX); |
|
for (i = 0; i < max; i++) { |
|
if (smc_rtoken_delete(link, llc->rkey[i])) |
|
err_mask |= 1 << (SMC_LLC_DEL_RKEY_MAX - 1 - i); |
|
} |
|
if (err_mask) { |
|
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG; |
|
llc->err_mask = err_mask; |
|
} |
|
finish: |
|
llc->hd.flags |= SMC_LLC_FLAG_RESP; |
|
smc_llc_send_message(link, &qentry->msg); |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_rmt); |
|
} |
|
|
|
static void smc_llc_protocol_violation(struct smc_link_group *lgr, u8 type) |
|
{ |
|
pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu LLC protocol violation: " |
|
"llc_type %d\n", SMC_LGR_ID_SIZE, &lgr->id, |
|
lgr->net->net_cookie, type); |
|
smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_PROT_VIOL); |
|
smc_lgr_terminate_sched(lgr); |
|
} |
|
|
|
/* flush the llc event queue */ |
|
static void smc_llc_event_flush(struct smc_link_group *lgr) |
|
{ |
|
struct smc_llc_qentry *qentry, *q; |
|
|
|
spin_lock_bh(&lgr->llc_event_q_lock); |
|
list_for_each_entry_safe(qentry, q, &lgr->llc_event_q, list) { |
|
list_del_init(&qentry->list); |
|
kfree(qentry); |
|
} |
|
spin_unlock_bh(&lgr->llc_event_q_lock); |
|
} |
|
|
|
static void smc_llc_event_handler(struct smc_llc_qentry *qentry) |
|
{ |
|
union smc_llc_msg *llc = &qentry->msg; |
|
struct smc_link *link = qentry->link; |
|
struct smc_link_group *lgr = link->lgr; |
|
|
|
if (!smc_link_usable(link)) |
|
goto out; |
|
|
|
switch (llc->raw.hdr.common.llc_type) { |
|
case SMC_LLC_TEST_LINK: |
|
llc->test_link.hd.flags |= SMC_LLC_FLAG_RESP; |
|
smc_llc_send_message(link, llc); |
|
break; |
|
case SMC_LLC_ADD_LINK: |
|
if (list_empty(&lgr->list)) |
|
goto out; /* lgr is terminating */ |
|
if (lgr->role == SMC_CLNT) { |
|
if (smc_llc_is_local_add_link(llc)) { |
|
if (lgr->llc_flow_lcl.type == |
|
SMC_LLC_FLOW_ADD_LINK) |
|
break; /* add_link in progress */ |
|
if (smc_llc_flow_start(&lgr->llc_flow_lcl, |
|
qentry)) { |
|
schedule_work(&lgr->llc_add_link_work); |
|
} |
|
return; |
|
} |
|
if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_ADD_LINK && |
|
!lgr->llc_flow_lcl.qentry) { |
|
/* a flow is waiting for this message */ |
|
smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, |
|
qentry); |
|
wake_up(&lgr->llc_msg_waiter); |
|
return; |
|
} |
|
if (lgr->llc_flow_lcl.type == |
|
SMC_LLC_FLOW_REQ_ADD_LINK) { |
|
/* server started add_link processing */ |
|
lgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK; |
|
smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, |
|
qentry); |
|
schedule_work(&lgr->llc_add_link_work); |
|
return; |
|
} |
|
if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) { |
|
schedule_work(&lgr->llc_add_link_work); |
|
} |
|
} else if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) { |
|
/* as smc server, handle client suggestion */ |
|
schedule_work(&lgr->llc_add_link_work); |
|
} |
|
return; |
|
case SMC_LLC_CONFIRM_LINK: |
|
case SMC_LLC_ADD_LINK_CONT: |
|
if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { |
|
/* a flow is waiting for this message */ |
|
smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry); |
|
wake_up(&lgr->llc_msg_waiter); |
|
return; |
|
} |
|
break; |
|
case SMC_LLC_DELETE_LINK: |
|
if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_ADD_LINK && |
|
!lgr->llc_flow_lcl.qentry) { |
|
/* DEL LINK REQ during ADD LINK SEQ */ |
|
smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry); |
|
wake_up(&lgr->llc_msg_waiter); |
|
} else if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) { |
|
schedule_work(&lgr->llc_del_link_work); |
|
} |
|
return; |
|
case SMC_LLC_CONFIRM_RKEY: |
|
/* new request from remote, assign to remote flow */ |
|
if (smc_llc_flow_start(&lgr->llc_flow_rmt, qentry)) { |
|
/* process here, does not wait for more llc msgs */ |
|
smc_llc_rmt_conf_rkey(lgr); |
|
smc_llc_flow_stop(lgr, &lgr->llc_flow_rmt); |
|
} |
|
return; |
|
case SMC_LLC_CONFIRM_RKEY_CONT: |
|
/* not used because max links is 3, and 3 rkeys fit into |
|
* one CONFIRM_RKEY message |
|
*/ |
|
break; |
|
case SMC_LLC_DELETE_RKEY: |
|
/* new request from remote, assign to remote flow */ |
|
if (smc_llc_flow_start(&lgr->llc_flow_rmt, qentry)) { |
|
/* process here, does not wait for more llc msgs */ |
|
smc_llc_rmt_delete_rkey(lgr); |
|
smc_llc_flow_stop(lgr, &lgr->llc_flow_rmt); |
|
} |
|
return; |
|
case SMC_LLC_REQ_ADD_LINK: |
|
/* handle response here, smc_llc_flow_stop() cannot be called |
|
* in tasklet context |
|
*/ |
|
if (lgr->role == SMC_CLNT && |
|
lgr->llc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK && |
|
(llc->raw.hdr.flags & SMC_LLC_FLAG_RESP)) { |
|
smc_llc_flow_stop(link->lgr, &lgr->llc_flow_lcl); |
|
} else if (lgr->role == SMC_SERV) { |
|
if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) { |
|
/* as smc server, handle client suggestion */ |
|
lgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK; |
|
schedule_work(&lgr->llc_add_link_work); |
|
} |
|
return; |
|
} |
|
break; |
|
default: |
|
smc_llc_protocol_violation(lgr, llc->raw.hdr.common.type); |
|
break; |
|
} |
|
out: |
|
kfree(qentry); |
|
} |
|
|
|
/* worker to process llc messages on the event queue */ |
|
static void smc_llc_event_work(struct work_struct *work) |
|
{ |
|
struct smc_link_group *lgr = container_of(work, struct smc_link_group, |
|
llc_event_work); |
|
struct smc_llc_qentry *qentry; |
|
|
|
if (!lgr->llc_flow_lcl.type && lgr->delayed_event) { |
|
qentry = lgr->delayed_event; |
|
lgr->delayed_event = NULL; |
|
if (smc_link_usable(qentry->link)) |
|
smc_llc_event_handler(qentry); |
|
else |
|
kfree(qentry); |
|
} |
|
|
|
again: |
|
spin_lock_bh(&lgr->llc_event_q_lock); |
|
if (!list_empty(&lgr->llc_event_q)) { |
|
qentry = list_first_entry(&lgr->llc_event_q, |
|
struct smc_llc_qentry, list); |
|
list_del_init(&qentry->list); |
|
spin_unlock_bh(&lgr->llc_event_q_lock); |
|
smc_llc_event_handler(qentry); |
|
goto again; |
|
} |
|
spin_unlock_bh(&lgr->llc_event_q_lock); |
|
} |
|
|
|
/* process llc responses in tasklet context */ |
|
static void smc_llc_rx_response(struct smc_link *link, |
|
struct smc_llc_qentry *qentry) |
|
{ |
|
enum smc_llc_flowtype flowtype = link->lgr->llc_flow_lcl.type; |
|
struct smc_llc_flow *flow = &link->lgr->llc_flow_lcl; |
|
u8 llc_type = qentry->msg.raw.hdr.common.llc_type; |
|
|
|
switch (llc_type) { |
|
case SMC_LLC_TEST_LINK: |
|
if (smc_link_active(link)) |
|
complete(&link->llc_testlink_resp); |
|
break; |
|
case SMC_LLC_ADD_LINK: |
|
case SMC_LLC_ADD_LINK_CONT: |
|
case SMC_LLC_CONFIRM_LINK: |
|
if (flowtype != SMC_LLC_FLOW_ADD_LINK || flow->qentry) |
|
break; /* drop out-of-flow response */ |
|
goto assign; |
|
case SMC_LLC_DELETE_LINK: |
|
if (flowtype != SMC_LLC_FLOW_DEL_LINK || flow->qentry) |
|
break; /* drop out-of-flow response */ |
|
goto assign; |
|
case SMC_LLC_CONFIRM_RKEY: |
|
case SMC_LLC_DELETE_RKEY: |
|
if (flowtype != SMC_LLC_FLOW_RKEY || flow->qentry) |
|
break; /* drop out-of-flow response */ |
|
goto assign; |
|
case SMC_LLC_CONFIRM_RKEY_CONT: |
|
/* not used because max links is 3 */ |
|
break; |
|
default: |
|
smc_llc_protocol_violation(link->lgr, |
|
qentry->msg.raw.hdr.common.type); |
|
break; |
|
} |
|
kfree(qentry); |
|
return; |
|
assign: |
|
/* assign responses to the local flow, we requested them */ |
|
smc_llc_flow_qentry_set(&link->lgr->llc_flow_lcl, qentry); |
|
wake_up(&link->lgr->llc_msg_waiter); |
|
} |
|
|
|
static void smc_llc_enqueue(struct smc_link *link, union smc_llc_msg *llc) |
|
{ |
|
struct smc_link_group *lgr = link->lgr; |
|
struct smc_llc_qentry *qentry; |
|
unsigned long flags; |
|
|
|
qentry = kmalloc(sizeof(*qentry), GFP_ATOMIC); |
|
if (!qentry) |
|
return; |
|
qentry->link = link; |
|
INIT_LIST_HEAD(&qentry->list); |
|
memcpy(&qentry->msg, llc, sizeof(union smc_llc_msg)); |
|
|
|
/* process responses immediately */ |
|
if ((llc->raw.hdr.flags & SMC_LLC_FLAG_RESP) && |
|
llc->raw.hdr.common.llc_type != SMC_LLC_REQ_ADD_LINK) { |
|
smc_llc_rx_response(link, qentry); |
|
return; |
|
} |
|
|
|
/* add requests to event queue */ |
|
spin_lock_irqsave(&lgr->llc_event_q_lock, flags); |
|
list_add_tail(&qentry->list, &lgr->llc_event_q); |
|
spin_unlock_irqrestore(&lgr->llc_event_q_lock, flags); |
|
queue_work(system_highpri_wq, &lgr->llc_event_work); |
|
} |
|
|
|
/* copy received msg and add it to the event queue */ |
|
static void smc_llc_rx_handler(struct ib_wc *wc, void *buf) |
|
{ |
|
struct smc_link *link = (struct smc_link *)wc->qp->qp_context; |
|
union smc_llc_msg *llc = buf; |
|
|
|
if (wc->byte_len < sizeof(*llc)) |
|
return; /* short message */ |
|
if (!llc->raw.hdr.common.llc_version) { |
|
if (llc->raw.hdr.length != sizeof(*llc)) |
|
return; /* invalid message */ |
|
} else { |
|
if (llc->raw.hdr.length_v2 < sizeof(*llc)) |
|
return; /* invalid message */ |
|
} |
|
|
|
smc_llc_enqueue(link, llc); |
|
} |
|
|
|
/***************************** worker, utils *********************************/ |
|
|
|
static void smc_llc_testlink_work(struct work_struct *work) |
|
{ |
|
struct smc_link *link = container_of(to_delayed_work(work), |
|
struct smc_link, llc_testlink_wrk); |
|
unsigned long next_interval; |
|
unsigned long expire_time; |
|
u8 user_data[16] = { 0 }; |
|
int rc; |
|
|
|
if (!smc_link_active(link)) |
|
return; /* don't reschedule worker */ |
|
expire_time = link->wr_rx_tstamp + link->llc_testlink_time; |
|
if (time_is_after_jiffies(expire_time)) { |
|
next_interval = expire_time - jiffies; |
|
goto out; |
|
} |
|
reinit_completion(&link->llc_testlink_resp); |
|
smc_llc_send_test_link(link, user_data); |
|
/* receive TEST LINK response over RoCE fabric */ |
|
rc = wait_for_completion_interruptible_timeout(&link->llc_testlink_resp, |
|
SMC_LLC_WAIT_TIME); |
|
if (!smc_link_active(link)) |
|
return; /* link state changed */ |
|
if (rc <= 0) { |
|
smcr_link_down_cond_sched(link); |
|
return; |
|
} |
|
next_interval = link->llc_testlink_time; |
|
out: |
|
schedule_delayed_work(&link->llc_testlink_wrk, next_interval); |
|
} |
|
|
|
void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc) |
|
{ |
|
struct net *net = sock_net(smc->clcsock->sk); |
|
|
|
INIT_WORK(&lgr->llc_event_work, smc_llc_event_work); |
|
INIT_WORK(&lgr->llc_add_link_work, smc_llc_add_link_work); |
|
INIT_WORK(&lgr->llc_del_link_work, smc_llc_delete_link_work); |
|
INIT_LIST_HEAD(&lgr->llc_event_q); |
|
spin_lock_init(&lgr->llc_event_q_lock); |
|
spin_lock_init(&lgr->llc_flow_lock); |
|
init_waitqueue_head(&lgr->llc_flow_waiter); |
|
init_waitqueue_head(&lgr->llc_msg_waiter); |
|
mutex_init(&lgr->llc_conf_mutex); |
|
lgr->llc_testlink_time = net->ipv4.sysctl_tcp_keepalive_time; |
|
} |
|
|
|
/* called after lgr was removed from lgr_list */ |
|
void smc_llc_lgr_clear(struct smc_link_group *lgr) |
|
{ |
|
smc_llc_event_flush(lgr); |
|
wake_up_all(&lgr->llc_flow_waiter); |
|
wake_up_all(&lgr->llc_msg_waiter); |
|
cancel_work_sync(&lgr->llc_event_work); |
|
cancel_work_sync(&lgr->llc_add_link_work); |
|
cancel_work_sync(&lgr->llc_del_link_work); |
|
if (lgr->delayed_event) { |
|
kfree(lgr->delayed_event); |
|
lgr->delayed_event = NULL; |
|
} |
|
} |
|
|
|
int smc_llc_link_init(struct smc_link *link) |
|
{ |
|
init_completion(&link->llc_testlink_resp); |
|
INIT_DELAYED_WORK(&link->llc_testlink_wrk, smc_llc_testlink_work); |
|
return 0; |
|
} |
|
|
|
void smc_llc_link_active(struct smc_link *link) |
|
{ |
|
pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu link added: id %*phN, " |
|
"peerid %*phN, ibdev %s, ibport %d\n", |
|
SMC_LGR_ID_SIZE, &link->lgr->id, |
|
link->lgr->net->net_cookie, |
|
SMC_LGR_ID_SIZE, &link->link_uid, |
|
SMC_LGR_ID_SIZE, &link->peer_link_uid, |
|
link->smcibdev->ibdev->name, link->ibport); |
|
link->state = SMC_LNK_ACTIVE; |
|
if (link->lgr->llc_testlink_time) { |
|
link->llc_testlink_time = link->lgr->llc_testlink_time; |
|
schedule_delayed_work(&link->llc_testlink_wrk, |
|
link->llc_testlink_time); |
|
} |
|
} |
|
|
|
/* called in worker context */ |
|
void smc_llc_link_clear(struct smc_link *link, bool log) |
|
{ |
|
if (log) |
|
pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu link removed: id %*phN" |
|
", peerid %*phN, ibdev %s, ibport %d\n", |
|
SMC_LGR_ID_SIZE, &link->lgr->id, |
|
link->lgr->net->net_cookie, |
|
SMC_LGR_ID_SIZE, &link->link_uid, |
|
SMC_LGR_ID_SIZE, &link->peer_link_uid, |
|
link->smcibdev->ibdev->name, link->ibport); |
|
complete(&link->llc_testlink_resp); |
|
cancel_delayed_work_sync(&link->llc_testlink_wrk); |
|
} |
|
|
|
/* register a new rtoken at the remote peer (for all links) */ |
|
int smc_llc_do_confirm_rkey(struct smc_link *send_link, |
|
struct smc_buf_desc *rmb_desc) |
|
{ |
|
struct smc_link_group *lgr = send_link->lgr; |
|
struct smc_llc_qentry *qentry = NULL; |
|
int rc = 0; |
|
|
|
rc = smc_llc_send_confirm_rkey(send_link, rmb_desc); |
|
if (rc) |
|
goto out; |
|
/* receive CONFIRM RKEY response from server over RoCE fabric */ |
|
qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME, |
|
SMC_LLC_CONFIRM_RKEY); |
|
if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG)) |
|
rc = -EFAULT; |
|
out: |
|
if (qentry) |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
return rc; |
|
} |
|
|
|
/* unregister an rtoken at the remote peer */ |
|
int smc_llc_do_delete_rkey(struct smc_link_group *lgr, |
|
struct smc_buf_desc *rmb_desc) |
|
{ |
|
struct smc_llc_qentry *qentry = NULL; |
|
struct smc_link *send_link; |
|
int rc = 0; |
|
|
|
send_link = smc_llc_usable_link(lgr); |
|
if (!send_link) |
|
return -ENOLINK; |
|
|
|
/* protected by llc_flow control */ |
|
rc = smc_llc_send_delete_rkey(send_link, rmb_desc); |
|
if (rc) |
|
goto out; |
|
/* receive DELETE RKEY response from server over RoCE fabric */ |
|
qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME, |
|
SMC_LLC_DELETE_RKEY); |
|
if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG)) |
|
rc = -EFAULT; |
|
out: |
|
if (qentry) |
|
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl); |
|
return rc; |
|
} |
|
|
|
void smc_llc_link_set_uid(struct smc_link *link) |
|
{ |
|
__be32 link_uid; |
|
|
|
link_uid = htonl(*((u32 *)link->lgr->id) + link->link_id); |
|
memcpy(link->link_uid, &link_uid, SMC_LGR_ID_SIZE); |
|
} |
|
|
|
/* save peers link user id, used for debug purposes */ |
|
void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry) |
|
{ |
|
memcpy(qentry->link->peer_link_uid, qentry->msg.confirm_link.link_uid, |
|
SMC_LGR_ID_SIZE); |
|
} |
|
|
|
/* evaluate confirm link request or response */ |
|
int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry, |
|
enum smc_llc_reqresp type) |
|
{ |
|
if (type == SMC_LLC_REQ) { /* SMC server assigns link_id */ |
|
qentry->link->link_id = qentry->msg.confirm_link.link_num; |
|
smc_llc_link_set_uid(qentry->link); |
|
} |
|
if (!(qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_NO_RMBE_EYEC)) |
|
return -ENOTSUPP; |
|
return 0; |
|
} |
|
|
|
/***************************** init, exit, misc ******************************/ |
|
|
|
static struct smc_wr_rx_handler smc_llc_rx_handlers[] = { |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_CONFIRM_LINK |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_TEST_LINK |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_ADD_LINK |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_ADD_LINK_CONT |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_DELETE_LINK |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_CONFIRM_RKEY |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_CONFIRM_RKEY_CONT |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_DELETE_RKEY |
|
}, |
|
/* V2 types */ |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_CONFIRM_LINK_V2 |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_TEST_LINK_V2 |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_ADD_LINK_V2 |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_DELETE_LINK_V2 |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_REQ_ADD_LINK_V2 |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_CONFIRM_RKEY_V2 |
|
}, |
|
{ |
|
.handler = smc_llc_rx_handler, |
|
.type = SMC_LLC_DELETE_RKEY_V2 |
|
}, |
|
{ |
|
.handler = NULL, |
|
} |
|
}; |
|
|
|
int __init smc_llc_init(void) |
|
{ |
|
struct smc_wr_rx_handler *handler; |
|
int rc = 0; |
|
|
|
for (handler = smc_llc_rx_handlers; handler->handler; handler++) { |
|
INIT_HLIST_NODE(&handler->list); |
|
rc = smc_wr_rx_register_handler(handler); |
|
if (rc) |
|
break; |
|
} |
|
return rc; |
|
}
|
|
|