forked from Minki/linux
IB/rdmavt: Add completion queue functions
Brings in completion queue functionality. A kthread worker is added to the rvt_dev_info to serve as a worker for completion queues. Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Reviewed-by: Harish Chegondi <harish.chegondi@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dennis Dalessandro
Doug Ledford
parent
47c7ea6d8e
commit
6f6387ae75
@ -45,7 +45,126 @@
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*
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*/
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/kthread.h>
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#include "cq.h"
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#include "vt.h"
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/**
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* rvt_cq_enter - add a new entry to the completion queue
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* @cq: completion queue
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* @entry: work completion entry to add
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* @sig: true if @entry is solicited
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*
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* This may be called with qp->s_lock held.
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*/
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void rvt_cq_enter(struct rvt_cq *cq, struct ib_wc *entry, bool solicited)
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{
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struct rvt_cq_wc *wc;
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unsigned long flags;
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u32 head;
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u32 next;
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spin_lock_irqsave(&cq->lock, flags);
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/*
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* Note that the head pointer might be writable by user processes.
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* Take care to verify it is a sane value.
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*/
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wc = cq->queue;
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head = wc->head;
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if (head >= (unsigned)cq->ibcq.cqe) {
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head = cq->ibcq.cqe;
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next = 0;
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} else {
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next = head + 1;
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}
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if (unlikely(next == wc->tail)) {
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spin_unlock_irqrestore(&cq->lock, flags);
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if (cq->ibcq.event_handler) {
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struct ib_event ev;
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ev.device = cq->ibcq.device;
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ev.element.cq = &cq->ibcq;
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ev.event = IB_EVENT_CQ_ERR;
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cq->ibcq.event_handler(&ev, cq->ibcq.cq_context);
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}
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return;
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}
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if (cq->ip) {
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wc->uqueue[head].wr_id = entry->wr_id;
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wc->uqueue[head].status = entry->status;
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wc->uqueue[head].opcode = entry->opcode;
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wc->uqueue[head].vendor_err = entry->vendor_err;
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wc->uqueue[head].byte_len = entry->byte_len;
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wc->uqueue[head].ex.imm_data =
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(__u32 __force)entry->ex.imm_data;
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wc->uqueue[head].qp_num = entry->qp->qp_num;
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wc->uqueue[head].src_qp = entry->src_qp;
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wc->uqueue[head].wc_flags = entry->wc_flags;
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wc->uqueue[head].pkey_index = entry->pkey_index;
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wc->uqueue[head].slid = entry->slid;
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wc->uqueue[head].sl = entry->sl;
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wc->uqueue[head].dlid_path_bits = entry->dlid_path_bits;
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wc->uqueue[head].port_num = entry->port_num;
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/* Make sure entry is written before the head index. */
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smp_wmb();
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} else {
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wc->kqueue[head] = *entry;
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}
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wc->head = next;
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if (cq->notify == IB_CQ_NEXT_COMP ||
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(cq->notify == IB_CQ_SOLICITED &&
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(solicited || entry->status != IB_WC_SUCCESS))) {
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struct kthread_worker *worker;
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/*
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* This will cause send_complete() to be called in
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* another thread.
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*/
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smp_read_barrier_depends(); /* see rvt_cq_exit */
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worker = cq->rdi->worker;
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if (likely(worker)) {
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cq->notify = RVT_CQ_NONE;
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cq->triggered++;
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queue_kthread_work(worker, &cq->comptask);
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}
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}
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spin_unlock_irqrestore(&cq->lock, flags);
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}
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EXPORT_SYMBOL(rvt_cq_enter);
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static void send_complete(struct kthread_work *work)
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{
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struct rvt_cq *cq = container_of(work, struct rvt_cq, comptask);
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/*
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* The completion handler will most likely rearm the notification
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* and poll for all pending entries. If a new completion entry
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* is added while we are in this routine, queue_work()
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* won't call us again until we return so we check triggered to
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* see if we need to call the handler again.
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*/
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for (;;) {
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u8 triggered = cq->triggered;
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/*
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* IPoIB connected mode assumes the callback is from a
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* soft IRQ. We simulate this by blocking "bottom halves".
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* See the implementation for ipoib_cm_handle_tx_wc(),
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* netif_tx_lock_bh() and netif_tx_lock().
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*/
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local_bh_disable();
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cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
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local_bh_enable();
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if (cq->triggered == triggered)
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return;
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}
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}
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/**
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* rvt_create_cq - create a completion queue
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@ -64,7 +183,103 @@ struct ib_cq *rvt_create_cq(struct ib_device *ibdev,
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struct ib_ucontext *context,
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struct ib_udata *udata)
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{
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return ERR_PTR(-EOPNOTSUPP);
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struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
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struct rvt_cq *cq;
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struct rvt_cq_wc *wc;
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struct ib_cq *ret;
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u32 sz;
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unsigned int entries = attr->cqe;
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if (attr->flags)
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return ERR_PTR(-EINVAL);
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if (entries < 1 || entries > rdi->dparms.props.max_cqe)
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return ERR_PTR(-EINVAL);
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/* Allocate the completion queue structure. */
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cq = kzalloc(sizeof(*cq), GFP_KERNEL);
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if (!cq)
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return ERR_PTR(-ENOMEM);
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/*
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* Allocate the completion queue entries and head/tail pointers.
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* This is allocated separately so that it can be resized and
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* also mapped into user space.
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* We need to use vmalloc() in order to support mmap and large
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* numbers of entries.
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*/
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sz = sizeof(*wc);
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if (udata && udata->outlen >= sizeof(__u64))
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sz += sizeof(struct ib_uverbs_wc) * (entries + 1);
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else
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sz += sizeof(struct ib_wc) * (entries + 1);
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wc = vmalloc_user(sz);
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if (!wc) {
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ret = ERR_PTR(-ENOMEM);
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goto bail_cq;
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}
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/*
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* Return the address of the WC as the offset to mmap.
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* See rvt_mmap() for details.
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*/
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if (udata && udata->outlen >= sizeof(__u64)) {
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int err;
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cq->ip = rvt_create_mmap_info(rdi, sz, context, wc);
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if (!cq->ip) {
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ret = ERR_PTR(-ENOMEM);
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goto bail_wc;
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}
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err = ib_copy_to_udata(udata, &cq->ip->offset,
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sizeof(cq->ip->offset));
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if (err) {
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ret = ERR_PTR(err);
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goto bail_ip;
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}
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}
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spin_lock(&rdi->n_cqs_lock);
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if (rdi->n_cqs_allocated == rdi->dparms.props.max_cq) {
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spin_unlock(&rdi->n_cqs_lock);
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ret = ERR_PTR(-ENOMEM);
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goto bail_ip;
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}
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rdi->n_cqs_allocated++;
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spin_unlock(&rdi->n_cqs_lock);
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if (cq->ip) {
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spin_lock_irq(&rdi->pending_lock);
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list_add(&cq->ip->pending_mmaps, &rdi->pending_mmaps);
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spin_unlock_irq(&rdi->pending_lock);
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}
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/*
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* ib_create_cq() will initialize cq->ibcq except for cq->ibcq.cqe.
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* The number of entries should be >= the number requested or return
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* an error.
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*/
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cq->rdi = rdi;
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cq->ibcq.cqe = entries;
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cq->notify = RVT_CQ_NONE;
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spin_lock_init(&cq->lock);
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init_kthread_work(&cq->comptask, send_complete);
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cq->queue = wc;
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ret = &cq->ibcq;
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goto done;
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bail_ip:
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kfree(cq->ip);
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bail_wc:
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vfree(wc);
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bail_cq:
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kfree(cq);
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done:
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return ret;
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}
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/**
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@ -77,12 +292,53 @@ struct ib_cq *rvt_create_cq(struct ib_device *ibdev,
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*/
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int rvt_destroy_cq(struct ib_cq *ibcq)
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{
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return -EOPNOTSUPP;
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struct rvt_cq *cq = ibcq_to_rvtcq(ibcq);
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struct rvt_dev_info *rdi = cq->rdi;
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flush_kthread_work(&cq->comptask);
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spin_lock(&rdi->n_cqs_lock);
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rdi->n_cqs_allocated--;
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spin_unlock(&rdi->n_cqs_lock);
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if (cq->ip)
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kref_put(&cq->ip->ref, rvt_release_mmap_info);
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else
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vfree(cq->queue);
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kfree(cq);
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return 0;
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}
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/**
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* rvt_req_notify_cq - change the notification type for a completion queue
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* @ibcq: the completion queue
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* @notify_flags: the type of notification to request
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*
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* Returns 0 for success.
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*
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* This may be called from interrupt context. Also called by
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* ib_req_notify_cq() in the generic verbs code.
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*/
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int rvt_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
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{
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return -EOPNOTSUPP;
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struct rvt_cq *cq = ibcq_to_rvtcq(ibcq);
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&cq->lock, flags);
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/*
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* Don't change IB_CQ_NEXT_COMP to IB_CQ_SOLICITED but allow
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* any other transitions (see C11-31 and C11-32 in ch. 11.4.2.2).
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*/
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if (cq->notify != IB_CQ_NEXT_COMP)
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cq->notify = notify_flags & IB_CQ_SOLICITED_MASK;
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if ((notify_flags & IB_CQ_REPORT_MISSED_EVENTS) &&
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cq->queue->head != cq->queue->tail)
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ret = 1;
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spin_unlock_irqrestore(&cq->lock, flags);
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return ret;
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}
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/**
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@ -93,7 +349,107 @@ int rvt_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
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*/
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int rvt_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata)
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{
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return -EOPNOTSUPP;
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struct rvt_cq *cq = ibcq_to_rvtcq(ibcq);
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struct rvt_cq_wc *old_wc;
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struct rvt_cq_wc *wc;
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u32 head, tail, n;
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int ret;
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u32 sz;
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struct rvt_dev_info *rdi = cq->rdi;
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if (cqe < 1 || cqe > rdi->dparms.props.max_cqe)
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return -EINVAL;
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/*
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* Need to use vmalloc() if we want to support large #s of entries.
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*/
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sz = sizeof(*wc);
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if (udata && udata->outlen >= sizeof(__u64))
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sz += sizeof(struct ib_uverbs_wc) * (cqe + 1);
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else
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sz += sizeof(struct ib_wc) * (cqe + 1);
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wc = vmalloc_user(sz);
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if (!wc)
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return -ENOMEM;
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/* Check that we can write the offset to mmap. */
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if (udata && udata->outlen >= sizeof(__u64)) {
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__u64 offset = 0;
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ret = ib_copy_to_udata(udata, &offset, sizeof(offset));
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if (ret)
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goto bail_free;
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}
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spin_lock_irq(&cq->lock);
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/*
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* Make sure head and tail are sane since they
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* might be user writable.
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*/
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old_wc = cq->queue;
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head = old_wc->head;
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if (head > (u32)cq->ibcq.cqe)
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head = (u32)cq->ibcq.cqe;
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tail = old_wc->tail;
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if (tail > (u32)cq->ibcq.cqe)
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tail = (u32)cq->ibcq.cqe;
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if (head < tail)
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n = cq->ibcq.cqe + 1 + head - tail;
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else
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n = head - tail;
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if (unlikely((u32)cqe < n)) {
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ret = -EINVAL;
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goto bail_unlock;
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}
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for (n = 0; tail != head; n++) {
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if (cq->ip)
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wc->uqueue[n] = old_wc->uqueue[tail];
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else
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wc->kqueue[n] = old_wc->kqueue[tail];
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if (tail == (u32)cq->ibcq.cqe)
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tail = 0;
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else
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tail++;
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}
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cq->ibcq.cqe = cqe;
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wc->head = n;
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wc->tail = 0;
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cq->queue = wc;
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spin_unlock_irq(&cq->lock);
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vfree(old_wc);
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if (cq->ip) {
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struct rvt_mmap_info *ip = cq->ip;
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rvt_update_mmap_info(rdi, ip, sz, wc);
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/*
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* Return the offset to mmap.
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* See rvt_mmap() for details.
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*/
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if (udata && udata->outlen >= sizeof(__u64)) {
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ret = ib_copy_to_udata(udata, &ip->offset,
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sizeof(ip->offset));
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if (ret)
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goto bail;
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}
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spin_lock_irq(&rdi->pending_lock);
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if (list_empty(&ip->pending_mmaps))
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list_add(&ip->pending_mmaps, &rdi->pending_mmaps);
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spin_unlock_irq(&rdi->pending_lock);
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}
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return 0;
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bail_unlock:
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spin_unlock_irq(&cq->lock);
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bail_free:
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vfree(wc);
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bail:
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return ret;
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}
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/**
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@ -109,5 +465,84 @@ int rvt_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata)
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*/
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int rvt_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
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{
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return -EOPNOTSUPP;
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struct rvt_cq *cq = ibcq_to_rvtcq(ibcq);
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struct rvt_cq_wc *wc;
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unsigned long flags;
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int npolled;
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u32 tail;
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/* The kernel can only poll a kernel completion queue */
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if (cq->ip)
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return -EINVAL;
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spin_lock_irqsave(&cq->lock, flags);
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wc = cq->queue;
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tail = wc->tail;
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if (tail > (u32)cq->ibcq.cqe)
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tail = (u32)cq->ibcq.cqe;
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for (npolled = 0; npolled < num_entries; ++npolled, ++entry) {
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if (tail == wc->head)
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break;
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/* The kernel doesn't need a RMB since it has the lock. */
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*entry = wc->kqueue[tail];
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if (tail >= cq->ibcq.cqe)
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tail = 0;
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else
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tail++;
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}
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wc->tail = tail;
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spin_unlock_irqrestore(&cq->lock, flags);
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return npolled;
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}
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int rvt_driver_cq_init(struct rvt_dev_info *rdi)
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{
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int ret = 0;
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int cpu;
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struct task_struct *task;
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if (rdi->flags & RVT_FLAG_CQ_INIT_DRIVER) {
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rvt_pr_info(rdi, "Driver is doing CQ init.\n");
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return 0;
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}
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if (rdi->worker)
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return 0;
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rdi->worker = kzalloc(sizeof(*rdi->worker), GFP_KERNEL);
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if (!rdi->worker)
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return -ENOMEM;
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init_kthread_worker(rdi->worker);
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task = kthread_create_on_node(
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kthread_worker_fn,
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rdi->worker,
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rdi->dparms.node,
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"%s", rdi->dparms.cq_name);
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if (IS_ERR(task)) {
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kfree(rdi->worker);
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rdi->worker = NULL;
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return PTR_ERR(task);
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}
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cpu = cpumask_first(cpumask_of_node(rdi->dparms.node));
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kthread_bind(task, cpu);
|
||||
wake_up_process(task);
|
||||
return ret;
|
||||
}
|
||||
|
||||
void rvt_cq_exit(struct rvt_dev_info *rdi)
|
||||
{
|
||||
struct kthread_worker *worker;
|
||||
|
||||
worker = rdi->worker;
|
||||
if (!worker)
|
||||
return;
|
||||
/* blocks future queuing from send_complete() */
|
||||
rdi->worker = NULL;
|
||||
smp_wmb(); /* See rdi_cq_enter */
|
||||
flush_kthread_worker(worker);
|
||||
kthread_stop(worker->task);
|
||||
kfree(worker);
|
||||
}
|
||||
|
||||
@ -49,6 +49,7 @@
|
||||
*/
|
||||
|
||||
#include <rdma/rdma_vt.h>
|
||||
#include <rdma/rdmavt_cq.h>
|
||||
|
||||
struct ib_cq *rvt_create_cq(struct ib_device *ibdev,
|
||||
const struct ib_cq_init_attr *attr,
|
||||
@ -58,5 +59,6 @@ int rvt_destroy_cq(struct ib_cq *ibcq);
|
||||
int rvt_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags);
|
||||
int rvt_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata);
|
||||
int rvt_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry);
|
||||
|
||||
int rvt_driver_cq_init(struct rvt_dev_info *rdi);
|
||||
void rvt_cq_exit(struct rvt_dev_info *rdi);
|
||||
#endif /* DEF_RVTCQ_H */
|
||||
|
||||
@ -324,6 +324,11 @@ int rvt_register_device(struct rvt_dev_info *rdi)
|
||||
CHECK_DRIVER_OVERRIDE(rdi, mmap);
|
||||
|
||||
/* Completion queues */
|
||||
ret = rvt_driver_cq_init(rdi);
|
||||
if (ret) {
|
||||
pr_err("Error in driver CQ init.\n");
|
||||
goto bail_mr;
|
||||
}
|
||||
CHECK_DRIVER_OVERRIDE(rdi, create_cq);
|
||||
CHECK_DRIVER_OVERRIDE(rdi, destroy_cq);
|
||||
CHECK_DRIVER_OVERRIDE(rdi, poll_cq);
|
||||
@ -344,12 +349,15 @@ int rvt_register_device(struct rvt_dev_info *rdi)
|
||||
ret = ib_register_device(&rdi->ibdev, rdi->driver_f.port_callback);
|
||||
if (ret) {
|
||||
rvt_pr_err(rdi, "Failed to register driver with ib core.\n");
|
||||
goto bail_mr;
|
||||
goto bail_cq;
|
||||
}
|
||||
|
||||
rvt_pr_info(rdi, "Registration with rdmavt done.\n");
|
||||
return ret;
|
||||
|
||||
bail_cq:
|
||||
rvt_cq_exit(rdi);
|
||||
|
||||
bail_mr:
|
||||
rvt_mr_exit(rdi);
|
||||
|
||||
@ -366,6 +374,7 @@ void rvt_unregister_device(struct rvt_dev_info *rdi)
|
||||
return;
|
||||
|
||||
ib_unregister_device(&rdi->ibdev);
|
||||
rvt_cq_exit(rdi);
|
||||
rvt_mr_exit(rdi);
|
||||
rvt_qp_exit(rdi);
|
||||
}
|
||||
|
||||
@ -138,6 +138,8 @@ struct rvt_ibport {
|
||||
/* TODO: Move sm_ah and smi_ah into here as well*/
|
||||
};
|
||||
|
||||
#define RVT_CQN_MAX 16 /* maximum length of cq name */
|
||||
|
||||
/*
|
||||
* Things that are driver specific, module parameters in hfi1 and qib
|
||||
*/
|
||||
@ -190,6 +192,8 @@ struct rvt_driver_params {
|
||||
int nports;
|
||||
int npkeys;
|
||||
u8 qos_shift;
|
||||
char cq_name[RVT_CQN_MAX];
|
||||
int node;
|
||||
};
|
||||
|
||||
/* Protection domain */
|
||||
@ -281,6 +285,11 @@ struct rvt_dev_info {
|
||||
spinlock_t mmap_offset_lock; /* protect mmap_offset */
|
||||
u32 mmap_offset;
|
||||
spinlock_t pending_lock; /* protect pending mmap list */
|
||||
|
||||
/* CQ */
|
||||
struct kthread_worker *worker; /* per device cq worker */
|
||||
u32 n_cqs_allocated; /* number of CQs allocated for device */
|
||||
spinlock_t n_cqs_lock; /* protect count of in use cqs */
|
||||
};
|
||||
|
||||
static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
|
||||
|
||||
99
include/rdma/rdmavt_cq.h
Normal file
99
include/rdma/rdmavt_cq.h
Normal file
@ -0,0 +1,99 @@
|
||||
#ifndef DEF_RDMAVT_INCCQ_H
|
||||
#define DEF_RDMAVT_INCCQ_H
|
||||
|
||||
/*
|
||||
*
|
||||
* This file is provided under a dual BSD/GPLv2 license. When using or
|
||||
* redistributing this file, you may do so under either license.
|
||||
*
|
||||
* GPL LICENSE SUMMARY
|
||||
*
|
||||
* Copyright(c) 2016 Intel Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of version 2 of the GNU General Public License as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* BSD LICENSE
|
||||
*
|
||||
* Copyright(c) 2015 Intel Corporation.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* - Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* - Neither the name of Intel Corporation nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/kthread.h>
|
||||
#include <rdma/ib_user_verbs.h>
|
||||
|
||||
/*
|
||||
* Define an ib_cq_notify value that is not valid so we know when CQ
|
||||
* notifications are armed.
|
||||
*/
|
||||
#define RVT_CQ_NONE (IB_CQ_NEXT_COMP + 1)
|
||||
|
||||
/*
|
||||
* This structure is used to contain the head pointer, tail pointer,
|
||||
* and completion queue entries as a single memory allocation so
|
||||
* it can be mmap'ed into user space.
|
||||
*/
|
||||
struct rvt_cq_wc {
|
||||
u32 head; /* index of next entry to fill */
|
||||
u32 tail; /* index of next ib_poll_cq() entry */
|
||||
union {
|
||||
/* these are actually size ibcq.cqe + 1 */
|
||||
struct ib_uverbs_wc uqueue[0];
|
||||
struct ib_wc kqueue[0];
|
||||
};
|
||||
};
|
||||
|
||||
/*
|
||||
* The completion queue structure.
|
||||
*/
|
||||
struct rvt_cq {
|
||||
struct ib_cq ibcq;
|
||||
struct kthread_work comptask;
|
||||
spinlock_t lock; /* protect changes in this struct */
|
||||
u8 notify;
|
||||
u8 triggered;
|
||||
struct rvt_dev_info *rdi;
|
||||
struct rvt_cq_wc *queue;
|
||||
struct rvt_mmap_info *ip;
|
||||
};
|
||||
|
||||
static inline struct rvt_cq *ibcq_to_rvtcq(struct ib_cq *ibcq)
|
||||
{
|
||||
return container_of(ibcq, struct rvt_cq, ibcq);
|
||||
}
|
||||
|
||||
void rvt_cq_enter(struct rvt_cq *cq, struct ib_wc *entry, bool solicited);
|
||||
|
||||
#endif /* DEF_RDMAVT_INCCQH */
|
||||
Loading…
Reference in New Issue
Block a user