143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/*
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* QEMU paravirtual RDMA - Device rings
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*
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* Copyright (C) 2018 Oracle
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* Copyright (C) 2018 Red Hat Inc
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*
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* Authors:
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* Yuval Shaia <yuval.shaia@oracle.com>
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* Marcel Apfelbaum <marcel@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/cutils.h"
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#include "hw/pci/pci.h"
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#include "cpu.h"
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#include "qemu/cutils.h"
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#include "trace.h"
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#include "../rdma_utils.h"
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#include "pvrdma_dev_ring.h"
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int pvrdma_ring_init(PvrdmaRing *ring, const char *name, PCIDevice *dev,
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PvrdmaRingState *ring_state, uint32_t max_elems,
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size_t elem_sz, dma_addr_t *tbl, uint32_t npages)
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{
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int i;
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int rc = 0;
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pstrcpy(ring->name, MAX_RING_NAME_SZ, name);
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ring->dev = dev;
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ring->ring_state = ring_state;
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ring->max_elems = max_elems;
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ring->elem_sz = elem_sz;
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/* TODO: Give a moment to think if we want to redo driver settings
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qatomic_set(&ring->ring_state->prod_tail, 0);
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qatomic_set(&ring->ring_state->cons_head, 0);
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*/
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ring->npages = npages;
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ring->pages = g_new0(void *, npages);
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for (i = 0; i < npages; i++) {
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if (!tbl[i]) {
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rdma_error_report("npages=%d but tbl[%d] is NULL", npages, i);
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continue;
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}
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ring->pages[i] = rdma_pci_dma_map(dev, tbl[i], TARGET_PAGE_SIZE);
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if (!ring->pages[i]) {
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rc = -ENOMEM;
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rdma_error_report("Failed to map to page %d in ring %s", i, name);
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goto out_free;
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}
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memset(ring->pages[i], 0, TARGET_PAGE_SIZE);
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}
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goto out;
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out_free:
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while (i--) {
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rdma_pci_dma_unmap(dev, ring->pages[i], TARGET_PAGE_SIZE);
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}
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g_free(ring->pages);
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out:
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return rc;
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}
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void *pvrdma_ring_next_elem_read(PvrdmaRing *ring)
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{
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unsigned int idx, offset;
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const uint32_t tail = qatomic_read(&ring->ring_state->prod_tail);
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const uint32_t head = qatomic_read(&ring->ring_state->cons_head);
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if (tail & ~((ring->max_elems << 1) - 1) ||
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head & ~((ring->max_elems << 1) - 1) ||
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tail == head) {
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trace_pvrdma_ring_next_elem_read_no_data(ring->name);
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return NULL;
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}
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idx = head & (ring->max_elems - 1);
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offset = idx * ring->elem_sz;
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return ring->pages[offset / TARGET_PAGE_SIZE] + (offset % TARGET_PAGE_SIZE);
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}
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void pvrdma_ring_read_inc(PvrdmaRing *ring)
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{
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uint32_t idx = qatomic_read(&ring->ring_state->cons_head);
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idx = (idx + 1) & ((ring->max_elems << 1) - 1);
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qatomic_set(&ring->ring_state->cons_head, idx);
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}
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void *pvrdma_ring_next_elem_write(PvrdmaRing *ring)
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{
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unsigned int idx, offset;
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const uint32_t tail = qatomic_read(&ring->ring_state->prod_tail);
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const uint32_t head = qatomic_read(&ring->ring_state->cons_head);
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if (tail & ~((ring->max_elems << 1) - 1) ||
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head & ~((ring->max_elems << 1) - 1) ||
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tail == (head ^ ring->max_elems)) {
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rdma_error_report("CQ is full");
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return NULL;
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}
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idx = tail & (ring->max_elems - 1);
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offset = idx * ring->elem_sz;
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return ring->pages[offset / TARGET_PAGE_SIZE] + (offset % TARGET_PAGE_SIZE);
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}
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void pvrdma_ring_write_inc(PvrdmaRing *ring)
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{
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uint32_t idx = qatomic_read(&ring->ring_state->prod_tail);
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idx = (idx + 1) & ((ring->max_elems << 1) - 1);
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qatomic_set(&ring->ring_state->prod_tail, idx);
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}
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void pvrdma_ring_free(PvrdmaRing *ring)
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{
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if (!ring) {
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return;
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}
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if (!ring->pages) {
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return;
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}
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while (ring->npages--) {
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rdma_pci_dma_unmap(ring->dev, ring->pages[ring->npages],
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TARGET_PAGE_SIZE);
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}
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g_free(ring->pages);
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ring->pages = NULL;
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}
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