vio_util.c revision 3af08d828975d7e2581b6829e0eecff14d87a483
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * CDDL HEADER START
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d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Use is subject to license terms.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan#pragma ident "%Z%%M% %I% %E% SMI"
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Create a pool of mblks from which future vio_allocb() requests
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * will be serviced.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * NOTE: num_mblks has to non-zero and a power-of-2
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Returns 0 on success or EINVAL if num_mblks is zero or not
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * a power of 2.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayanvio_create_mblks(uint64_t num_mblks, size_t mblk_size, vio_mblk_pool_t **poolp)
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan vmplp->quemask = num_mblks - 1; /* expects quelen is power-of-2 */
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan vmplp->basep = kmem_zalloc(num_mblks * sizeof (vio_mblk_t), KM_SLEEP);
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan vmplp->datap = kmem_zalloc(num_mblks * mblk_size, KM_SLEEP);
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan /* create a queue of pointers to free vio_mblk_t's */
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan vmplp->quep = kmem_zalloc(vmplp->quelen * sizeof (vio_mblk_t *),
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan for (i = 0, datap = vmplp->datap; i < num_mblks; i++) {
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan vmp->mp = desballoc(vmp->datap, mblk_size, BPRI_MED,
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan /* put this vmp on the free stack */
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan return (0);
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Destroy the pool of mblks. This can only succeed when
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * all allocated mblks have been returned to the pool.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * It is up to the caller to ensure that no further mblks are
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * requested from the pool after destroy has been invoked.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Returns 0 on success, EINVAL if handle is invalid, or
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * EBUSY if not all mblks reclaimed yet.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * We can only destroy the pool once all the mblks have
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * been reclaimed.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan /* some mblks still in use */
3af08d828975d7e2581b6829e0eecff14d87a483lm * Set pool flag to tell vio_freeb() which is invoked from freeb(),
3af08d828975d7e2581b6829e0eecff14d87a483lm * that it is being called in the context of vio_destroy_mblks().
3af08d828975d7e2581b6829e0eecff14d87a483lm * This results in freeing only mblk_t and dblk_t structures for
3af08d828975d7e2581b6829e0eecff14d87a483lm * each mp. The associated data buffers are freed below as one big
3af08d828975d7e2581b6829e0eecff14d87a483lm * chunk through kmem_free(vmplp->datap).
3af08d828975d7e2581b6829e0eecff14d87a483lm for (i = 0; i < num_mblks; i++) {
3af08d828975d7e2581b6829e0eecff14d87a483lm kmem_free(vmplp->basep, num_mblks * sizeof (vio_mblk_t));
3af08d828975d7e2581b6829e0eecff14d87a483lm kmem_free(vmplp->quep, num_mblks * sizeof (vio_mblk_t *));
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan return (0);
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Allocate a mblk from the free pool if one is available.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Otherwise returns NULL.
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan /* we have free mblks */
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * Return a mblk to the free pool. Invoked when the upper IP
d10e4ef2fabf16c3237c6d6592496df3eac6a1efnarayan * layers do freemsg() etc on the mblk they were passed.
3af08d828975d7e2581b6829e0eecff14d87a483lm * This flag indicates that freeb() is being called from
3af08d828975d7e2581b6829e0eecff14d87a483lm * vio_destroy_mblks().
3af08d828975d7e2581b6829e0eecff14d87a483lm * We don't need to alloc a new mblk_t/dblk_t pair for
3af08d828975d7e2581b6829e0eecff14d87a483lm * this data buffer, return from here and the data buffer
3af08d828975d7e2581b6829e0eecff14d87a483lm * itself will be freed in vio_destroy_mblks().