Release 4.17 net/smc/smc_llc.c
// 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 */
}
Contributors
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| Total | 21 | 100.00% | 1 | 100.00% |
/**
* 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, 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ursula Braun | 90 | 100.00% | 1 | 100.00% |
| Total | 90 | 100.00% | 1 | 100.00% |
/* high-level API to send LLC confirm link */
int smc_llc_send_confirm_link(struct smc_link *link, u8 mac[],
union ib_gid *gid,
enum smc_llc_reqresp reqresp)
{
struct smc_link_group *lgr = container_of(link, struct smc_link_group,
lnk[SMC_SINGLE_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, mac, ETH_ALEN);
memcpy(confllc->sender_gid, 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;
}
Contributors
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| Ursula Braun | 203 | 91.86% | 1 | 25.00% |
| Karsten Graul | 10 | 4.52% | 2 | 50.00% |
| David S. Miller | 8 | 3.62% | 1 | 25.00% |
| Total | 221 | 100.00% | 4 | 100.00% |
/* send ADD LINK request or response */
int smc_llc_send_add_link(struct smc_link *link, u8 mac[],
union ib_gid *gid,
enum smc_llc_reqresp reqresp)
{
struct smc_llc_msg_add_link *addllc;
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
int rc;
rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
if (rc)
return rc;
addllc = (struct smc_llc_msg_add_link *)wr_buf;
memset(addllc, 0, sizeof(*addllc));
addllc->hd.common.type = SMC_LLC_ADD_LINK;
addllc->hd.length = sizeof(struct smc_llc_msg_add_link);
if (reqresp == SMC_LLC_RESP) {
addllc->hd.flags |= SMC_LLC_FLAG_RESP;
/* always reject more links for now */
addllc->hd.flags |= SMC_LLC_FLAG_ADD_LNK_REJ;
addllc->hd.add_link_rej_rsn = SMC_LLC_REJ_RSN_NO_ALT_PATH;
}
memcpy(addllc->sender_mac, mac, ETH_ALEN);
memcpy(addllc->sender_gid, gid, SMC_GID_SIZE);
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 173 | 100.00% | 2 | 100.00% |
| Total | 173 | 100.00% | 2 | 100.00% |
/* send DELETE LINK request or response */
int smc_llc_send_delete_link(struct smc_link *link,
enum smc_llc_reqresp reqresp)
{
struct smc_llc_msg_del_link *delllc;
struct smc_wr_tx_pend_priv *pend;
struct smc_wr_buf *wr_buf;
int rc;
rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
if (rc)
return rc;
delllc = (struct smc_llc_msg_del_link *)wr_buf;
memset(delllc, 0, sizeof(*delllc));
delllc->hd.common.type = SMC_LLC_DELETE_LINK;
delllc->hd.length = sizeof(struct smc_llc_msg_add_link);
if (reqresp == SMC_LLC_RESP)
delllc->hd.flags |= SMC_LLC_FLAG_RESP;
/* DEL_LINK_ALL because only 1 link supported */
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
delllc->link_num = link->link_id;
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 148 | 100.00% | 2 | 100.00% |
| Total | 148 | 100.00% | 2 | 100.00% |
/* send LLC test link request or response */
int smc_llc_send_test_link(struct smc_link *link, u8 user_data[16],
enum smc_llc_reqresp reqresp)
{
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);
if (reqresp == SMC_LLC_RESP)
testllc->hd.flags |= SMC_LLC_FLAG_RESP;
memcpy(testllc->user_data, user_data, sizeof(testllc->user_data));
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
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| Karsten Graul | 145 | 100.00% | 1 | 100.00% |
| Total | 145 | 100.00% | 1 | 100.00% |
/* send a prepared message */
static int smc_llc_send_message(struct smc_link *link, void *llcbuf, int llclen)
{
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;
memcpy(wr_buf, llcbuf, llclen);
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 73 | 100.00% | 1 | 100.00% |
| Total | 73 | 100.00% | 1 | 100.00% |
/********************************* receive ***********************************/
static void smc_llc_rx_confirm_link(struct smc_link *link,
struct smc_llc_msg_confirm_link *llc)
{
struct smc_link_group *lgr;
int conf_rc;
lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
/* 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);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 134 | 94.37% | 1 | 50.00% |
| Ursula Braun | 8 | 5.63% | 1 | 50.00% |
| Total | 142 | 100.00% | 2 | 100.00% |
static void smc_llc_rx_add_link(struct smc_link *link,
struct smc_llc_msg_add_link *llc)
{
struct smc_link_group *lgr = container_of(link, struct smc_link_group,
lnk[SMC_SINGLE_LINK]);
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (link->state == SMC_LNK_ACTIVATING)
complete(&link->llc_add_resp);
} else {
if (link->state == SMC_LNK_ACTIVATING) {
complete(&link->llc_add);
return;
}
if (lgr->role == SMC_SERV) {
smc_llc_send_add_link(link,
link->smcibdev->mac[link->ibport - 1],
&link->smcibdev->gid[link->ibport - 1],
SMC_LLC_REQ);
} else {
smc_llc_send_add_link(link,
link->smcibdev->mac[link->ibport - 1],
&link->smcibdev->gid[link->ibport - 1],
SMC_LLC_RESP);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 125 | 75.76% | 2 | 66.67% |
| Ursula Braun | 40 | 24.24% | 1 | 33.33% |
| Total | 165 | 100.00% | 3 | 100.00% |
static void smc_llc_rx_delete_link(struct smc_link *link,
struct smc_llc_msg_del_link *llc)
{
struct smc_link_group *lgr = container_of(link, struct smc_link_group,
lnk[SMC_SINGLE_LINK]);
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (lgr->role == SMC_SERV)
smc_lgr_terminate(lgr);
} else {
if (lgr->role == SMC_SERV) {
smc_lgr_forget(lgr);
smc_llc_send_delete_link(link, SMC_LLC_REQ);
} else {
smc_llc_send_delete_link(link, SMC_LLC_RESP);
smc_lgr_terminate(lgr);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 81 | 81.82% | 3 | 75.00% |
| Ursula Braun | 18 | 18.18% | 1 | 25.00% |
| Total | 99 | 100.00% | 4 | 100.00% |
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) {
/* unused as long as we don't send this type of msg */
} else {
smc_llc_send_test_link(link, llc->user_data, SMC_LLC_RESP);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 43 | 100.00% | 1 | 100.00% |
| Total | 43 | 100.00% | 1 | 100.00% |
static void smc_llc_rx_confirm_rkey(struct smc_link *link,
struct smc_llc_msg_confirm_rkey *llc)
{
struct smc_link_group *lgr;
int rc;
lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
/* unused as long as we don't send this type of msg */
} else {
rc = smc_rtoken_add(lgr,
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, (void *)llc, sizeof(*llc));
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 99 | 82.50% | 1 | 50.00% |
| Ursula Braun | 21 | 17.50% | 1 | 50.00% |
| Total | 120 | 100.00% | 2 | 100.00% |
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, (void *)llc, sizeof(*llc));
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 58 | 100.00% | 1 | 100.00% |
| Total | 58 | 100.00% | 1 | 100.00% |
static void smc_llc_rx_delete_rkey(struct smc_link *link,
struct smc_llc_msg_delete_rkey *llc)
{
struct smc_link_group *lgr;
u8 err_mask = 0;
int i, max;
lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
/* unused as long as we don't send this type of msg */
} else {
max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
for (i = 0; i < max; i++) {
if (smc_rtoken_delete(lgr, 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, (void *)llc, sizeof(*llc));
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 161 | 100.00% | 1 | 100.00% |
| Total | 161 | 100.00% | 1 | 100.00% |
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 */
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;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 159 | 87.36% | 3 | 75.00% |
| Ursula Braun | 23 | 12.64% | 1 | 25.00% |
| Total | 182 | 100.00% | 4 | 100.00% |
/***************************** 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ursula Braun | 56 | 100.00% | 1 | 100.00% |
| Total | 56 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Karsten Graul | 1776 | 73.51% | 5 | 55.56% |
| Ursula Braun | 534 | 22.10% | 1 | 11.11% |
| Stefan Raspl | 97 | 4.01% | 1 | 11.11% |
| David S. Miller | 8 | 0.33% | 1 | 11.11% |
| Greg Kroah-Hartman | 1 | 0.04% | 1 | 11.11% |
| Total | 2416 | 100.00% | 9 | 100.00% |
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