/* * Reuse, or allocate (and program the page pods for) a new DDP buffer. The * "pages" array is handed over to this function and should not be used in any * way by the caller after that. */ static int select_ddp_buffer(struct adapter *sc, struct toepcb *toep, vm_page_t *pages, int npages, int db_off, int db_len) { struct ddp_buffer *db; struct tom_data *td = sc->tom_softc; int i, empty_slot = -1; /* Try to reuse */ for (i = 0; i < nitems(toep->db); i++) { if (bufcmp(toep->db[i], pages, npages, db_off, db_len) == 0) { free(pages, M_CXGBE); return (i); /* pages still held */ } else if (toep->db[i] == NULL && empty_slot < 0) empty_slot = i; } /* Allocate new buffer, write its page pods. */ db = alloc_ddp_buffer(td, pages, npages, db_off, db_len); if (db == NULL) { vm_page_unhold_pages(pages, npages); free(pages, M_CXGBE); return (-1); } if (write_page_pods(sc, toep, db) != 0) { vm_page_unhold_pages(pages, npages); free_ddp_buffer(td, db); return (-1); } i = empty_slot; if (i < 0) { i = arc4random() % nitems(toep->db); free_ddp_buffer(td, toep->db[i]); } toep->db[i] = db; CTR5(KTR_CXGBE, "%s: tid %d, DDP buffer[%d] = %p (tag 0x%x)", __func__, toep->tid, i, db, db->tag); return (i); }
void release_ddp_resources(struct toepcb *toep) { int i; for (i = 0; i < nitems(toep->db); i++) { if (toep->db[i] != NULL) { free_ddp_buffer(toep->td, toep->db[i]); toep->db[i] = NULL; } } }