v4.19.13 snapshot.
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
new file mode 100644
index 0000000..9c916c7
--- /dev/null
+++ b/net/smc/smc_llc.c
@@ -0,0 +1,711 @@
+// 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, 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;
+}
+
+/* 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_schedule_free_work_fast(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) {
+ /* 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(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));
+ 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_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;
+}
+
+/* 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);
+}
+
+/* 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;
+
+ reinit_completion(&link->llc_confirm_rkey);
+ smc_llc_send_confirm_rkey(link, rmb_desc);
+ /* 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;
+}
+
+/***************************** 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;
+}