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alistair23-linux/net/smc/smc_llc.c
Ursula Braun 0b29ec6436 net/smc: immediate termination for SMCR link groups 
If the SMC module is unloaded or an IB device is thrown away, the
immediate link group freeing introduced for SMCD is exploited for SMCR
as well. That means SMCR-specifics are added to smc_conn_kill().

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-11-15 12:28:28 -08:00

771 lines
21 KiB
C
Raw Blame History

// 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 <Klaus.Wacker@de.ibm.com>
* Ursula Braun <ubraun@linux.vnet.ibm.com>
*/
#include <net/tcp.h>
#include <rdma/ib_verbs.h>
#include "smc.h"
#include "smc_core.h"
#include "smc_clc.h"
#include "smc_llc.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;
u8 flags2; /* QP mtu */
u8 initial_psn[3];
u8 reserved[8];
};
#define SMC_LLC_FLAG_DEL_LINK_ALL 0x40
#define SMC_LLC_FLAG_DEL_LINK_ORDERLY 0x20
struct smc_llc_msg_del_link { /* type 0x04 */
struct smc_llc_hdr hd;
u8 link_num;
__be32 reason;
u8 reserved[35];
} __packed; /* format defined in RFC7609 */
struct smc_llc_msg_test_link { /* type 0x07 */
struct smc_llc_hdr hd;
u8 user_data[16];
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;
};
struct smc_llc_msg_confirm_rkey_cont { /* type 0x08 */
struct smc_llc_hdr hd;
u8 num_rkeys;
struct smc_rmb_rtoken rtoken[SMC_LLC_RKEYS_PER_MSG];
};
#define SMC_LLC_DEL_RKEY_MAX 8
#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_del_link delete_link;
struct smc_llc_msg_confirm_rkey confirm_rkey;
struct smc_llc_msg_confirm_rkey_cont confirm_rkey_cont;
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
/********************************** 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_link_group *lgr = smc_get_lgr(link);
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, lgr->id, SMC_LGR_ID_SIZE);
confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS; /* enforce peer resp. */
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
/* send LLC confirm rkey request */
static int smc_llc_send_confirm_rkey(struct smc_link *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;
int rc;
rc = smc_llc_add_pending_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);
rkeyllc->rtoken[0].rmb_key =
htonl(rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
rkeyllc->rtoken[0].rmb_vaddr = cpu_to_be64(
(u64)sg_dma_address(rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
/* send llc message */
rc = smc_wr_tx_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[SMC_SINGLE_LINK]->rkey);
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
/* prepare an add link message */
static void smc_llc_prep_add_link(struct smc_llc_msg_add_link *addllc,
struct smc_link *link, u8 mac[], u8 gid[],
enum smc_llc_reqresp reqresp)
{
memset(addllc, 0, sizeof(*addllc));
addllc->hd.common.type = SMC_LLC_ADD_LINK;
addllc->hd.length = sizeof(struct smc_llc_msg_add_link);
if (reqresp == SMC_LLC_RESP) {
addllc->hd.flags |= SMC_LLC_FLAG_RESP;
/* always reject more links for now */
addllc->hd.flags |= SMC_LLC_FLAG_ADD_LNK_REJ;
addllc->hd.add_link_rej_rsn = SMC_LLC_REJ_RSN_NO_ALT_PATH;
}
memcpy(addllc->sender_mac, mac, ETH_ALEN);
memcpy(addllc->sender_gid, gid, SMC_GID_SIZE);
}
/* send ADD LINK request or response */
int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
enum smc_llc_reqresp reqresp)
{
struct smc_llc_msg_add_link *addllc;
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
int rc;
rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
if (rc)
return rc;
addllc = (struct smc_llc_msg_add_link *)wr_buf;
smc_llc_prep_add_link(addllc, link, mac, gid, reqresp);
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
/* prepare a delete link message */
static void smc_llc_prep_delete_link(struct smc_llc_msg_del_link *delllc,
struct smc_link *link,
enum smc_llc_reqresp reqresp, bool orderly)
{
memset(delllc, 0, sizeof(*delllc));
delllc->hd.common.type = SMC_LLC_DELETE_LINK;
delllc->hd.length = sizeof(struct smc_llc_msg_add_link);
if (reqresp == SMC_LLC_RESP)
delllc->hd.flags |= SMC_LLC_FLAG_RESP;
/* DEL_LINK_ALL because only 1 link supported */
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
if (orderly)
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
delllc->link_num = link->link_id;
}
/* send DELETE LINK request or response */
int smc_llc_send_delete_link(struct smc_link *link,
enum smc_llc_reqresp reqresp, bool orderly)
{
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;
smc_llc_prep_delete_link(delllc, link, reqresp, orderly);
/* 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;
}
struct smc_llc_send_work {
struct work_struct work;
struct smc_link *link;
int llclen;
union smc_llc_msg llcbuf;
};
/* worker that sends a prepared message */
static void smc_llc_send_message_work(struct work_struct *work)
{
struct smc_llc_send_work *llcwrk = container_of(work,
struct smc_llc_send_work, work);
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
int rc;
if (llcwrk->link->state == SMC_LNK_INACTIVE)
goto out;
rc = smc_llc_add_pending_send(llcwrk->link, &wr_buf, &pend);
if (rc)
goto out;
memcpy(wr_buf, &llcwrk->llcbuf, llcwrk->llclen);
smc_wr_tx_send(llcwrk->link, pend);
out:
kfree(llcwrk);
}
/* copy llcbuf and schedule an llc send on link */
static int smc_llc_send_message(struct smc_link *link, void *llcbuf, int llclen)
{
struct smc_llc_send_work *wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
if (!wrk)
return -ENOMEM;
INIT_WORK(&wrk->work, smc_llc_send_message_work);
wrk->link = link;
wrk->llclen = llclen;
memcpy(&wrk->llcbuf, llcbuf, llclen);
queue_work(link->llc_wq, &wrk->work);
return 0;
}
/********************************* receive ***********************************/
static void smc_llc_rx_confirm_link(struct smc_link *link,
struct smc_llc_msg_confirm_link *llc)
{
struct smc_link_group *lgr = smc_get_lgr(link);
int conf_rc;
/* RMBE eyecatchers are not supported */
if (llc->hd.flags & SMC_LLC_FLAG_NO_RMBE_EYEC)
conf_rc = 0;
else
conf_rc = ENOTSUPP;
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (lgr->role == SMC_SERV &&
link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_resp_rc = conf_rc;
complete(&link->llc_confirm_resp);
}
} else {
if (lgr->role == SMC_CLNT &&
link->state == SMC_LNK_ACTIVATING) {
link->llc_confirm_rc = conf_rc;
link->link_id = llc->link_num;
complete(&link->llc_confirm);
}
}
}
static void smc_llc_rx_add_link(struct smc_link *link,
struct smc_llc_msg_add_link *llc)
{
struct smc_link_group *lgr = smc_get_lgr(link);
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (link->state == SMC_LNK_ACTIVATING)
complete(&link->llc_add_resp);
} else {
if (link->state == SMC_LNK_ACTIVATING) {
complete(&link->llc_add);
return;
}
if (lgr->role == SMC_SERV) {
smc_llc_prep_add_link(llc, link,
link->smcibdev->mac[link->ibport - 1],
link->gid, SMC_LLC_REQ);
} else {
smc_llc_prep_add_link(llc, link,
link->smcibdev->mac[link->ibport - 1],
link->gid, SMC_LLC_RESP);
}
smc_llc_send_message(link, llc, sizeof(*llc));
}
}
static void smc_llc_rx_delete_link(struct smc_link *link,
struct smc_llc_msg_del_link *llc)
{
struct smc_link_group *lgr = smc_get_lgr(link);
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (lgr->role == SMC_SERV)
smc_lgr_schedule_free_work_fast(lgr);
} else {
smc_lgr_forget(lgr);
smc_llc_link_deleting(link);
if (lgr->role == SMC_SERV) {
/* client asks to delete this link, send request */
smc_llc_prep_delete_link(llc, link, SMC_LLC_REQ, true);
} else {
/* server requests to delete this link, send response */
smc_llc_prep_delete_link(llc, link, SMC_LLC_RESP, true);
}
smc_llc_send_message(link, llc, sizeof(*llc));
smc_lgr_terminate_sched(lgr);
}
}
static void smc_llc_rx_test_link(struct smc_link *link,
struct smc_llc_msg_test_link *llc)
{
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (link->state == SMC_LNK_ACTIVE)
complete(&link->llc_testlink_resp);
} else {
llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc, sizeof(*llc));
}
}
static void smc_llc_rx_confirm_rkey(struct smc_link *link,
struct smc_llc_msg_confirm_rkey *llc)
{
int rc;
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
link->llc_confirm_rkey_rc = llc->hd.flags &
SMC_LLC_FLAG_RKEY_NEG;
complete(&link->llc_confirm_rkey);
} else {
rc = smc_rtoken_add(smc_get_lgr(link),
llc->rtoken[0].rmb_vaddr,
llc->rtoken[0].rmb_key);
/* ignore rtokens for other links, we have only one link */
llc->hd.flags |= SMC_LLC_FLAG_RESP;
if (rc < 0)
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
smc_llc_send_message(link, llc, sizeof(*llc));
}
}
static void smc_llc_rx_confirm_rkey_cont(struct smc_link *link,
struct smc_llc_msg_confirm_rkey_cont *llc)
{
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
/* unused as long as we don't send this type of msg */
} else {
/* ignore rtokens for other links, we have only one link */
llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc, sizeof(*llc));
}
}
static void smc_llc_rx_delete_rkey(struct smc_link *link,
struct smc_llc_msg_delete_rkey *llc)
{
u8 err_mask = 0;
int i, max;
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
link->llc_delete_rkey_rc = llc->hd.flags &
SMC_LLC_FLAG_RKEY_NEG;
complete(&link->llc_delete_rkey);
} else {
max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
for (i = 0; i < max; i++) {
if (smc_rtoken_delete(smc_get_lgr(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;
}
llc->hd.flags |= SMC_LLC_FLAG_RESP;
smc_llc_send_message(link, llc, sizeof(*llc));
}
}
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.length != sizeof(*llc))
return; /* invalid message */
if (link->state == SMC_LNK_INACTIVE)
return; /* link not active, drop msg */
switch (llc->raw.hdr.common.type) {
case SMC_LLC_TEST_LINK:
smc_llc_rx_test_link(link, &llc->test_link);
break;
case SMC_LLC_CONFIRM_LINK:
smc_llc_rx_confirm_link(link, &llc->confirm_link);
break;
case SMC_LLC_ADD_LINK:
smc_llc_rx_add_link(link, &llc->add_link);
break;
case SMC_LLC_DELETE_LINK:
smc_llc_rx_delete_link(link, &llc->delete_link);
break;
case SMC_LLC_CONFIRM_RKEY:
smc_llc_rx_confirm_rkey(link, &llc->confirm_rkey);
break;
case SMC_LLC_CONFIRM_RKEY_CONT:
smc_llc_rx_confirm_rkey_cont(link, &llc->confirm_rkey_cont);
break;
case SMC_LLC_DELETE_RKEY:
smc_llc_rx_delete_rkey(link, &llc->delete_rkey);
break;
}
}
/***************************** 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 (link->state != SMC_LNK_ACTIVE)
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 (rc <= 0) {
smc_lgr_terminate(smc_get_lgr(link), true);
return;
}
next_interval = link->llc_testlink_time;
out:
queue_delayed_work(link->llc_wq, &link->llc_testlink_wrk,
next_interval);
}
int smc_llc_link_init(struct smc_link *link)
{
struct smc_link_group *lgr = smc_get_lgr(link);
link->llc_wq = alloc_ordered_workqueue("llc_wq-%x:%x)", WQ_MEM_RECLAIM,
*((u32 *)lgr->id),
link->link_id);
if (!link->llc_wq)
return -ENOMEM;
init_completion(&link->llc_confirm);
init_completion(&link->llc_confirm_resp);
init_completion(&link->llc_add);
init_completion(&link->llc_add_resp);
init_completion(&link->llc_confirm_rkey);
init_completion(&link->llc_delete_rkey);
mutex_init(&link->llc_delete_rkey_mutex);
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, int testlink_time)
{
link->state = SMC_LNK_ACTIVE;
if (testlink_time) {
link->llc_testlink_time = testlink_time * HZ;
queue_delayed_work(link->llc_wq, &link->llc_testlink_wrk,
link->llc_testlink_time);
}
}
void smc_llc_link_deleting(struct smc_link *link)
{
link->state = SMC_LNK_DELETING;
smc_wr_wakeup_tx_wait(link);
}
/* called in tasklet context */
void smc_llc_link_inactive(struct smc_link *link)
{
link->state = SMC_LNK_INACTIVE;
cancel_delayed_work(&link->llc_testlink_wrk);
smc_wr_wakeup_reg_wait(link);
smc_wr_wakeup_tx_wait(link);
}
/* called in worker context */
void smc_llc_link_clear(struct smc_link *link)
{
flush_workqueue(link->llc_wq);
destroy_workqueue(link->llc_wq);
}
/* register a new rtoken at the remote peer */
int smc_llc_do_confirm_rkey(struct smc_link *link,
struct smc_buf_desc *rmb_desc)
{
int rc;
/* protected by mutex smc_create_lgr_pending */
reinit_completion(&link->llc_confirm_rkey);
rc = smc_llc_send_confirm_rkey(link, rmb_desc);
if (rc)
return rc;
/* receive CONFIRM RKEY response from server over RoCE fabric */
rc = wait_for_completion_interruptible_timeout(&link->llc_confirm_rkey,
SMC_LLC_WAIT_TIME);
if (rc <= 0 || link->llc_confirm_rkey_rc)
return -EFAULT;
return 0;
}
/* unregister an rtoken at the remote peer */
int smc_llc_do_delete_rkey(struct smc_link *link,
struct smc_buf_desc *rmb_desc)
{
int rc = 0;
mutex_lock(&link->llc_delete_rkey_mutex);
if (link->state != SMC_LNK_ACTIVE)
goto out;
reinit_completion(&link->llc_delete_rkey);
rc = smc_llc_send_delete_rkey(link, rmb_desc);
if (rc)
goto out;
/* receive DELETE RKEY response from server over RoCE fabric */
rc = wait_for_completion_interruptible_timeout(&link->llc_delete_rkey,
SMC_LLC_WAIT_TIME);
if (rc <= 0 || link->llc_delete_rkey_rc)
rc = -EFAULT;
else
rc = 0;
out:
mutex_unlock(&link->llc_delete_rkey_mutex);
return rc;
}
/***************************** 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_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
},
{
.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;
}
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