net/smc: use worker to process incoming llc messages
Incoming llc messages are processed in irq tasklet context, and a worker is used to send outgoing messages. The worker is needed because getting a send buffer could result in a wait for a free buffer. To make sure all incoming llc messages are processed in a serialized way introduce an event queue and create a new queue entry for each message which is queued to this event queue. A new worker processes the event queue entries in order. And remove the use of a separate worker to send outgoing llc messages because the messages are processed in worker context already. With this event queue the serialized llc_wq work queue is obsolete, remove it. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
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2140ac26f8
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6c8968c421
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@ -412,7 +412,8 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
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lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
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memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
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SMC_SYSTEMID_LEN);
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INIT_LIST_HEAD(&lgr->llc_event_q);
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spin_lock_init(&lgr->llc_event_q_lock);
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link_idx = SMC_SINGLE_LINK;
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lnk = &lgr->lnk[link_idx];
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rc = smcr_link_init(lgr, lnk, link_idx, ini);
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@ -613,6 +614,7 @@ static void smc_lgr_free(struct smc_link_group *lgr)
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if (lgr->lnk[i].state != SMC_LNK_UNUSED)
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smcr_link_clear(&lgr->lnk[i]);
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}
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smc_llc_event_flush(lgr);
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if (!atomic_dec_return(&lgr_cnt))
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wake_up(&lgrs_deleted);
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}
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@ -120,7 +120,6 @@ struct smc_link {
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struct smc_link_group *lgr; /* parent link group */
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enum smc_link_state state; /* state of link */
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struct workqueue_struct *llc_wq; /* single thread work queue */
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struct completion llc_confirm; /* wait for rx of conf link */
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struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */
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int llc_confirm_rc; /* rc from confirm link msg */
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@ -233,6 +232,12 @@ struct smc_link_group {
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DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX);
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/* used rtoken elements */
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u8 next_link_id;
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struct list_head llc_event_q;
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/* queue for llc events */
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spinlock_t llc_event_q_lock;
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/* protects llc_event_q */
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struct work_struct llc_event_work;
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/* llc event worker */
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};
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struct { /* SMC-D */
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u64 peer_gid;
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@ -134,6 +134,12 @@ union smc_llc_msg {
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#define SMC_LLC_FLAG_RESP 0x80
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struct smc_llc_qentry {
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struct list_head list;
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struct smc_link *link;
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union smc_llc_msg msg;
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};
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/********************************** send *************************************/
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struct smc_llc_tx_pend {
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@ -356,46 +362,20 @@ static int smc_llc_send_test_link(struct smc_link *link, u8 user_data[16])
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return rc;
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}
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struct smc_llc_send_work {
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struct work_struct work;
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struct smc_link *link;
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int llclen;
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union smc_llc_msg llcbuf;
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};
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/* worker that sends a prepared message */
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static void smc_llc_send_message_work(struct work_struct *work)
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/* schedule an llc send on link, may wait for buffers */
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static int smc_llc_send_message(struct smc_link *link, void *llcbuf)
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{
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struct smc_llc_send_work *llcwrk = container_of(work,
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struct smc_llc_send_work, work);
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struct smc_wr_tx_pend_priv *pend;
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struct smc_wr_buf *wr_buf;
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int rc;
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if (!smc_link_usable(llcwrk->link))
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goto out;
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rc = smc_llc_add_pending_send(llcwrk->link, &wr_buf, &pend);
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if (!smc_link_usable(link))
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return -ENOLINK;
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rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
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if (rc)
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goto out;
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memcpy(wr_buf, &llcwrk->llcbuf, llcwrk->llclen);
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smc_wr_tx_send(llcwrk->link, pend);
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out:
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kfree(llcwrk);
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}
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/* copy llcbuf and schedule an llc send on link */
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static int smc_llc_send_message(struct smc_link *link, void *llcbuf, int llclen)
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{
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struct smc_llc_send_work *wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
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if (!wrk)
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return -ENOMEM;
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INIT_WORK(&wrk->work, smc_llc_send_message_work);
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wrk->link = link;
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wrk->llclen = llclen;
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memcpy(&wrk->llcbuf, llcbuf, llclen);
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queue_work(link->llc_wq, &wrk->work);
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return 0;
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return rc;
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memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg));
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return smc_wr_tx_send(link, pend);
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}
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/********************************* receive ***********************************/
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@ -452,7 +432,7 @@ static void smc_llc_rx_add_link(struct smc_link *link,
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link->smcibdev->mac[link->ibport - 1],
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link->gid, SMC_LLC_RESP);
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}
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smc_llc_send_message(link, llc, sizeof(*llc));
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smc_llc_send_message(link, llc);
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}
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}
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@ -474,7 +454,7 @@ static void smc_llc_rx_delete_link(struct smc_link *link,
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/* server requests to delete this link, send response */
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smc_llc_prep_delete_link(llc, link, SMC_LLC_RESP, true);
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}
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smc_llc_send_message(link, llc, sizeof(*llc));
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smc_llc_send_message(link, llc);
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smc_lgr_terminate_sched(lgr);
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}
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}
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@ -487,7 +467,7 @@ static void smc_llc_rx_test_link(struct smc_link *link,
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complete(&link->llc_testlink_resp);
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} else {
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llc->hd.flags |= SMC_LLC_FLAG_RESP;
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smc_llc_send_message(link, llc, sizeof(*llc));
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smc_llc_send_message(link, llc);
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}
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}
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@ -510,7 +490,7 @@ static void smc_llc_rx_confirm_rkey(struct smc_link *link,
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llc->hd.flags |= SMC_LLC_FLAG_RESP;
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if (rc < 0)
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llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
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smc_llc_send_message(link, llc, sizeof(*llc));
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smc_llc_send_message(link, llc);
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}
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}
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@ -522,7 +502,7 @@ static void smc_llc_rx_confirm_rkey_cont(struct smc_link *link,
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} else {
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/* ignore rtokens for other links, we have only one link */
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llc->hd.flags |= SMC_LLC_FLAG_RESP;
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smc_llc_send_message(link, llc, sizeof(*llc));
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smc_llc_send_message(link, llc);
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}
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}
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@ -549,21 +529,30 @@ static void smc_llc_rx_delete_rkey(struct smc_link *link,
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}
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llc->hd.flags |= SMC_LLC_FLAG_RESP;
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smc_llc_send_message(link, llc, sizeof(*llc));
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smc_llc_send_message(link, llc);
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}
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}
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static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
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/* flush the llc event queue */
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void smc_llc_event_flush(struct smc_link_group *lgr)
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{
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struct smc_link *link = (struct smc_link *)wc->qp->qp_context;
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union smc_llc_msg *llc = buf;
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struct smc_llc_qentry *qentry, *q;
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spin_lock_bh(&lgr->llc_event_q_lock);
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list_for_each_entry_safe(qentry, q, &lgr->llc_event_q, list) {
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list_del_init(&qentry->list);
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kfree(qentry);
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}
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spin_unlock_bh(&lgr->llc_event_q_lock);
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}
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static void smc_llc_event_handler(struct smc_llc_qentry *qentry)
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{
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union smc_llc_msg *llc = &qentry->msg;
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struct smc_link *link = qentry->link;
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if (wc->byte_len < sizeof(*llc))
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return; /* short message */
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if (llc->raw.hdr.length != sizeof(*llc))
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return; /* invalid message */
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if (!smc_link_usable(link))
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return; /* link not active, drop msg */
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goto out;
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switch (llc->raw.hdr.common.type) {
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case SMC_LLC_TEST_LINK:
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smc_llc_rx_delete_rkey(link, &llc->delete_rkey);
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break;
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}
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out:
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kfree(qentry);
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}
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/* worker to process llc messages on the event queue */
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static void smc_llc_event_work(struct work_struct *work)
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{
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struct smc_link_group *lgr = container_of(work, struct smc_link_group,
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llc_event_work);
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struct smc_llc_qentry *qentry;
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again:
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spin_lock_bh(&lgr->llc_event_q_lock);
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if (!list_empty(&lgr->llc_event_q)) {
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qentry = list_first_entry(&lgr->llc_event_q,
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struct smc_llc_qentry, list);
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list_del_init(&qentry->list);
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spin_unlock_bh(&lgr->llc_event_q_lock);
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smc_llc_event_handler(qentry);
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goto again;
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}
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spin_unlock_bh(&lgr->llc_event_q_lock);
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}
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/* copy received msg and add it to the event queue */
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static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
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{
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struct smc_link *link = (struct smc_link *)wc->qp->qp_context;
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struct smc_link_group *lgr = link->lgr;
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struct smc_llc_qentry *qentry;
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union smc_llc_msg *llc = buf;
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unsigned long flags;
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if (wc->byte_len < sizeof(*llc))
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return; /* short message */
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if (llc->raw.hdr.length != sizeof(*llc))
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return; /* invalid message */
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qentry = kmalloc(sizeof(*qentry), GFP_ATOMIC);
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if (!qentry)
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return;
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qentry->link = link;
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INIT_LIST_HEAD(&qentry->list);
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memcpy(&qentry->msg, llc, sizeof(union smc_llc_msg));
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spin_lock_irqsave(&lgr->llc_event_q_lock, flags);
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list_add_tail(&qentry->list, &lgr->llc_event_q);
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spin_unlock_irqrestore(&lgr->llc_event_q_lock, flags);
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schedule_work(&link->lgr->llc_event_work);
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}
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/***************************** worker, utils *********************************/
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@ -626,12 +663,6 @@ out:
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int smc_llc_link_init(struct smc_link *link)
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{
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struct smc_link_group *lgr = smc_get_lgr(link);
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link->llc_wq = alloc_ordered_workqueue("llc_wq-%x:%x)", WQ_MEM_RECLAIM,
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*((u32 *)lgr->id),
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link->link_id);
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if (!link->llc_wq)
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return -ENOMEM;
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init_completion(&link->llc_confirm);
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init_completion(&link->llc_confirm_resp);
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init_completion(&link->llc_add);
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init_completion(&link->llc_delete_rkey);
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mutex_init(&link->llc_delete_rkey_mutex);
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init_completion(&link->llc_testlink_resp);
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INIT_WORK(&link->lgr->llc_event_work, smc_llc_event_work);
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INIT_DELAYED_WORK(&link->llc_testlink_wrk, smc_llc_testlink_work);
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return 0;
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}
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/* called in worker context */
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void smc_llc_link_clear(struct smc_link *link)
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{
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flush_workqueue(link->llc_wq);
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destroy_workqueue(link->llc_wq);
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complete(&link->llc_testlink_resp);
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cancel_delayed_work_sync(&link->llc_testlink_wrk);
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smc_wr_wakeup_reg_wait(link);
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@ -61,6 +61,7 @@ int smc_llc_do_confirm_rkey(struct smc_link *link,
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struct smc_buf_desc *rmb_desc);
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int smc_llc_do_delete_rkey(struct smc_link *link,
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struct smc_buf_desc *rmb_desc);
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void smc_llc_event_flush(struct smc_link_group *lgr);
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int smc_llc_init(void) __init;
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#endif /* SMC_LLC_H */
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