/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #ifdef DEBUG #define XNB_DEBUG 1 #endif /* DEBUG */ #include "xnb.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* blech. */ /* * The terms "transmit" and "receive" are used in alignment with domU, * which means that packets originating from the peer domU are "transmitted" * to other parts of the system and packets are "received" from them. */ /* * XXPV dme: things to do, as well as various things indicated * throughout the source: * - copy avoidance outbound. * - copy avoidance inbound. * - transfer credit limiting. * - MAC address based filtering. */ /* * Linux expects to have some headroom in received buffers. The Linux * frontend driver (netfront) checks to see if the headroom is * available and will re-allocate the buffer to make room if * necessary. To avoid this we add RX_BUFFER_HEADROOM bytes of * headroom to each packet we pass to the peer. */ #define RX_BUFFER_HEADROOM 16 /* * Should we attempt to defer checksum calculation? */ static boolean_t xnb_cksum_offload = B_TRUE; /* * When receiving packets from a guest, should they be copied * or used as-is (esballoc)? */ static boolean_t xnb_tx_always_copy = B_TRUE; static boolean_t xnb_connect_rings(dev_info_t *); static void xnb_disconnect_rings(dev_info_t *); static void xnb_oe_state_change(dev_info_t *, ddi_eventcookie_t, void *, void *); static void xnb_hp_state_change(dev_info_t *, ddi_eventcookie_t, void *, void *); static int xnb_txbuf_constructor(void *, void *, int); static void xnb_txbuf_destructor(void *, void *); static xnb_txbuf_t *xnb_txbuf_get(xnb_t *, int); static void xnb_txbuf_put(xnb_t *, xnb_txbuf_t *); static void xnb_tx_notify_peer(xnb_t *); static void xnb_tx_complete(xnb_txbuf_t *); static void xnb_tx_mark_complete(xnb_t *, RING_IDX, int16_t); static void xnb_tx_schedule_unmop(xnb_t *, gnttab_map_grant_ref_t *, xnb_txbuf_t *); static void xnb_tx_perform_pending_unmop(xnb_t *); mblk_t *xnb_copy_to_peer(xnb_t *, mblk_t *); int xnb_unmop_lowwat = NET_TX_RING_SIZE >> 2; int xnb_unmop_hiwat = NET_TX_RING_SIZE - (NET_TX_RING_SIZE >> 2); boolean_t xnb_hv_copy = B_TRUE; boolean_t xnb_explicit_pageflip_set = B_FALSE; /* XXPV dme: are these really invalid? */ #define INVALID_GRANT_HANDLE ((grant_handle_t)-1) #define INVALID_GRANT_REF ((grant_ref_t)-1) static kmem_cache_t *xnb_txbuf_cachep; static kmutex_t xnb_alloc_page_lock; /* * Statistics. */ static char *aux_statistics[] = { "rx_cksum_deferred", "tx_cksum_no_need", "rx_rsp_notok", "tx_notify_deferred", "tx_notify_sent", "rx_notify_deferred", "rx_notify_sent", "tx_too_early", "rx_too_early", "rx_allocb_failed", "tx_allocb_failed", "rx_foreign_page", "mac_full", "spurious_intr", "allocation_success", "allocation_failure", "small_allocation_success", "small_allocation_failure", "other_allocation_failure", "rx_pageboundary_crossed", "rx_cpoparea_grown", "csum_hardware", "csum_software", }; static int xnb_ks_aux_update(kstat_t *ksp, int flag) { xnb_t *xnbp; kstat_named_t *knp; if (flag != KSTAT_READ) return (EACCES); xnbp = ksp->ks_private; knp = ksp->ks_data; /* * Assignment order should match that of the names in * aux_statistics. */ (knp++)->value.ui64 = xnbp->xnb_stat_rx_cksum_deferred; (knp++)->value.ui64 = xnbp->xnb_stat_tx_cksum_no_need; (knp++)->value.ui64 = xnbp->xnb_stat_rx_rsp_notok; (knp++)->value.ui64 = xnbp->xnb_stat_tx_notify_deferred; (knp++)->value.ui64 = xnbp->xnb_stat_tx_notify_sent; (knp++)->value.ui64 = xnbp->xnb_stat_rx_notify_deferred; (knp++)->value.ui64 = xnbp->xnb_stat_rx_notify_sent; (knp++)->value.ui64 = xnbp->xnb_stat_tx_too_early; (knp++)->value.ui64 = xnbp->xnb_stat_rx_too_early; (knp++)->value.ui64 = xnbp->xnb_stat_rx_allocb_failed; (knp++)->value.ui64 = xnbp->xnb_stat_tx_allocb_failed; (knp++)->value.ui64 = xnbp->xnb_stat_rx_foreign_page; (knp++)->value.ui64 = xnbp->xnb_stat_mac_full; (knp++)->value.ui64 = xnbp->xnb_stat_spurious_intr; (knp++)->value.ui64 = xnbp->xnb_stat_allocation_success; (knp++)->value.ui64 = xnbp->xnb_stat_allocation_failure; (knp++)->value.ui64 = xnbp->xnb_stat_small_allocation_success; (knp++)->value.ui64 = xnbp->xnb_stat_small_allocation_failure; (knp++)->value.ui64 = xnbp->xnb_stat_other_allocation_failure; (knp++)->value.ui64 = xnbp->xnb_stat_rx_pagebndry_crossed; (knp++)->value.ui64 = xnbp->xnb_stat_rx_cpoparea_grown; (knp++)->value.ui64 = xnbp->xnb_stat_csum_hardware; (knp++)->value.ui64 = xnbp->xnb_stat_csum_software; return (0); } static boolean_t xnb_ks_init(xnb_t *xnbp) { int nstat = sizeof (aux_statistics) / sizeof (aux_statistics[0]); char **cp = aux_statistics; kstat_named_t *knp; /* * Create and initialise kstats. */ xnbp->xnb_kstat_aux = kstat_create(ddi_driver_name(xnbp->xnb_devinfo), ddi_get_instance(xnbp->xnb_devinfo), "aux_statistics", "net", KSTAT_TYPE_NAMED, nstat, 0); if (xnbp->xnb_kstat_aux == NULL) return (B_FALSE); xnbp->xnb_kstat_aux->ks_private = xnbp; xnbp->xnb_kstat_aux->ks_update = xnb_ks_aux_update; knp = xnbp->xnb_kstat_aux->ks_data; while (nstat > 0) { kstat_named_init(knp, *cp, KSTAT_DATA_UINT64); knp++; cp++; nstat--; } kstat_install(xnbp->xnb_kstat_aux); return (B_TRUE); } static void xnb_ks_free(xnb_t *xnbp) { kstat_delete(xnbp->xnb_kstat_aux); } /* * Software checksum calculation and insertion for an arbitrary packet. */ /*ARGSUSED*/ static mblk_t * xnb_software_csum(xnb_t *xnbp, mblk_t *mp) { /* * XXPV dme: shouldn't rely on vnic_fix_cksum(), not least * because it doesn't cover all of the interesting cases :-( */ (void) hcksum_assoc(mp, NULL, NULL, 0, 0, 0, 0, HCK_FULLCKSUM, KM_NOSLEEP); return (vnic_fix_cksum(mp)); } mblk_t * xnb_process_cksum_flags(xnb_t *xnbp, mblk_t *mp, uint32_t capab) { struct ether_header *ehp; uint16_t sap; uint32_t offset; ipha_t *ipha; ASSERT(mp->b_next == NULL); /* * Check that the packet is contained in a single mblk. In * the "from peer" path this is true today, but will change * when scatter gather support is added. In the "to peer" * path we cannot be sure, but in most cases it will be true * (in the xnbo case the packet has come from a MAC device * which is unlikely to split packets). */ if (mp->b_cont != NULL) goto software; /* * If the MAC has no hardware capability don't do any further * checking. */ if (capab == 0) goto software; ASSERT(MBLKL(mp) >= sizeof (struct ether_header)); ehp = (struct ether_header *)mp->b_rptr; if (ntohs(ehp->ether_type) == VLAN_TPID) { struct ether_vlan_header *evhp; ASSERT(MBLKL(mp) >= sizeof (struct ether_vlan_header)); evhp = (struct ether_vlan_header *)mp->b_rptr; sap = ntohs(evhp->ether_type); offset = sizeof (struct ether_vlan_header); } else { sap = ntohs(ehp->ether_type); offset = sizeof (struct ether_header); } /* * We only attempt to do IPv4 packets in hardware. */ if (sap != ETHERTYPE_IP) goto software; /* * We know that this is an IPv4 packet. */ ipha = (ipha_t *)(mp->b_rptr + offset); switch (ipha->ipha_protocol) { case IPPROTO_TCP: case IPPROTO_UDP: { uint32_t start, length, stuff, cksum; uint16_t *stuffp; /* * This is a TCP/IPv4 or UDP/IPv4 packet, for which we * can use full IPv4 and partial checksum offload. */ if ((capab & (HCKSUM_INET_FULL_V4|HCKSUM_INET_PARTIAL)) == 0) break; start = IP_SIMPLE_HDR_LENGTH; length = ntohs(ipha->ipha_length); if (ipha->ipha_protocol == IPPROTO_TCP) { stuff = start + TCP_CHECKSUM_OFFSET; cksum = IP_TCP_CSUM_COMP; } else { stuff = start + UDP_CHECKSUM_OFFSET; cksum = IP_UDP_CSUM_COMP; } stuffp = (uint16_t *)(mp->b_rptr + offset + stuff); if (capab & HCKSUM_INET_FULL_V4) { /* * Some devices require that the checksum * field of the packet is zero for full * offload. */ *stuffp = 0; (void) hcksum_assoc(mp, NULL, NULL, 0, 0, 0, 0, HCK_FULLCKSUM, KM_NOSLEEP); xnbp->xnb_stat_csum_hardware++; return (mp); } if (capab & HCKSUM_INET_PARTIAL) { if (*stuffp == 0) { ipaddr_t src, dst; /* * Older Solaris guests don't insert * the pseudo-header checksum, so we * calculate it here. */ src = ipha->ipha_src; dst = ipha->ipha_dst; cksum += (dst >> 16) + (dst & 0xFFFF); cksum += (src >> 16) + (src & 0xFFFF); cksum += length - IP_SIMPLE_HDR_LENGTH; cksum = (cksum >> 16) + (cksum & 0xFFFF); cksum = (cksum >> 16) + (cksum & 0xFFFF); ASSERT(cksum <= 0xFFFF); *stuffp = (uint16_t)(cksum ? cksum : ~cksum); } (void) hcksum_assoc(mp, NULL, NULL, start, stuff, length, 0, HCK_PARTIALCKSUM, KM_NOSLEEP); xnbp->xnb_stat_csum_hardware++; return (mp); } /* NOTREACHED */ break; } default: /* Use software. */ break; } software: /* * We are not able to use any offload so do the whole thing in * software. */ xnbp->xnb_stat_csum_software++; return (xnb_software_csum(xnbp, mp)); } int xnb_attach(dev_info_t *dip, xnb_flavour_t *flavour, void *flavour_data) { xnb_t *xnbp; char *xsname, mac[ETHERADDRL * 3]; xnbp = kmem_zalloc(sizeof (*xnbp), KM_SLEEP); xnbp->xnb_flavour = flavour; xnbp->xnb_flavour_data = flavour_data; xnbp->xnb_devinfo = dip; xnbp->xnb_evtchn = INVALID_EVTCHN; xnbp->xnb_irq = B_FALSE; xnbp->xnb_tx_ring_handle = INVALID_GRANT_HANDLE; xnbp->xnb_rx_ring_handle = INVALID_GRANT_HANDLE; xnbp->xnb_cksum_offload = xnb_cksum_offload; xnbp->xnb_connected = B_FALSE; xnbp->xnb_hotplugged = B_FALSE; xnbp->xnb_detachable = B_FALSE; xnbp->xnb_peer = xvdi_get_oeid(dip); xnbp->xnb_tx_pages_writable = B_FALSE; xnbp->xnb_tx_always_copy = xnb_tx_always_copy; xnbp->xnb_tx_buf_count = 0; xnbp->xnb_tx_unmop_count = 0; xnbp->xnb_hv_copy = B_FALSE; xnbp->xnb_rx_va = vmem_alloc(heap_arena, PAGESIZE, VM_SLEEP); ASSERT(xnbp->xnb_rx_va != NULL); if (ddi_get_iblock_cookie(dip, 0, &xnbp->xnb_icookie) != DDI_SUCCESS) goto failure; /* allocated on demand, when/if we enter xnb_copy_to_peer() */ xnbp->xnb_rx_cpop = NULL; xnbp->xnb_cpop_sz = 0; mutex_init(&xnbp->xnb_tx_lock, NULL, MUTEX_DRIVER, xnbp->xnb_icookie); mutex_init(&xnbp->xnb_rx_lock, NULL, MUTEX_DRIVER, xnbp->xnb_icookie); /* set driver private pointer now */ ddi_set_driver_private(dip, xnbp); if (!xnb_ks_init(xnbp)) goto failure_1; /* * Receive notification of changes in the state of the * driver in the guest domain. */ if (xvdi_add_event_handler(dip, XS_OE_STATE, xnb_oe_state_change, NULL) != DDI_SUCCESS) goto failure_2; /* * Receive notification of hotplug events. */ if (xvdi_add_event_handler(dip, XS_HP_STATE, xnb_hp_state_change, NULL) != DDI_SUCCESS) goto failure_2; xsname = xvdi_get_xsname(dip); if (xenbus_printf(XBT_NULL, xsname, "feature-no-csum-offload", "%d", xnbp->xnb_cksum_offload ? 0 : 1) != 0) goto failure_3; /* * Use global xnb_hv_copy to export this feature. This means that * we have to decide what to do before starting up a guest domain */ if (xenbus_printf(XBT_NULL, xsname, "feature-rx-copy", "%d", xnb_hv_copy ? 1 : 0) != 0) goto failure_3; /* * Linux domUs seem to depend on "feature-rx-flip" being 0 * in addition to "feature-rx-copy" being 1. It seems strange * to use four possible states to describe a binary decision, * but we might as well play nice. */ if (xenbus_printf(XBT_NULL, xsname, "feature-rx-flip", "%d", xnb_explicit_pageflip_set ? 1 : 0) != 0) goto failure_3; if (xenbus_scanf(XBT_NULL, xsname, "mac", "%s", mac) != 0) { cmn_err(CE_WARN, "xnb_attach: " "cannot read mac address from %s", xsname); goto failure_3; } if (ether_aton(mac, xnbp->xnb_mac_addr) != ETHERADDRL) { cmn_err(CE_WARN, "xnb_attach: cannot parse mac address %s", mac); goto failure_3; } (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateInitWait); (void) xvdi_post_event(dip, XEN_HP_ADD); return (DDI_SUCCESS); failure_3: xvdi_remove_event_handler(dip, NULL); failure_2: xnb_ks_free(xnbp); failure_1: mutex_destroy(&xnbp->xnb_rx_lock); mutex_destroy(&xnbp->xnb_tx_lock); failure: vmem_free(heap_arena, xnbp->xnb_rx_va, PAGESIZE); kmem_free(xnbp, sizeof (*xnbp)); return (DDI_FAILURE); } /*ARGSUSED*/ void xnb_detach(dev_info_t *dip) { xnb_t *xnbp = ddi_get_driver_private(dip); ASSERT(xnbp != NULL); ASSERT(!xnbp->xnb_connected); ASSERT(xnbp->xnb_tx_buf_count == 0); xnb_disconnect_rings(dip); xvdi_remove_event_handler(dip, NULL); xnb_ks_free(xnbp); ddi_set_driver_private(dip, NULL); mutex_destroy(&xnbp->xnb_tx_lock); mutex_destroy(&xnbp->xnb_rx_lock); if (xnbp->xnb_cpop_sz > 0) kmem_free(xnbp->xnb_rx_cpop, sizeof (*xnbp->xnb_rx_cpop) * xnbp->xnb_cpop_sz); ASSERT(xnbp->xnb_rx_va != NULL); vmem_free(heap_arena, xnbp->xnb_rx_va, PAGESIZE); kmem_free(xnbp, sizeof (*xnbp)); } static mfn_t xnb_alloc_page(xnb_t *xnbp) { #define WARNING_RATE_LIMIT 100 #define BATCH_SIZE 256 static mfn_t mfns[BATCH_SIZE]; /* common across all instances */ static int nth = BATCH_SIZE; mfn_t mfn; mutex_enter(&xnb_alloc_page_lock); if (nth == BATCH_SIZE) { if (balloon_alloc_pages(BATCH_SIZE, mfns) != BATCH_SIZE) { xnbp->xnb_stat_allocation_failure++; mutex_exit(&xnb_alloc_page_lock); /* * Try for a single page in low memory situations. */ if (balloon_alloc_pages(1, &mfn) != 1) { if ((xnbp->xnb_stat_small_allocation_failure++ % WARNING_RATE_LIMIT) == 0) cmn_err(CE_WARN, "xnb_alloc_page: " "Cannot allocate memory to " "transfer packets to peer."); return (0); } else { xnbp->xnb_stat_small_allocation_success++; return (mfn); } } nth = 0; xnbp->xnb_stat_allocation_success++; } mfn = mfns[nth++]; mutex_exit(&xnb_alloc_page_lock); ASSERT(mfn != 0); return (mfn); #undef BATCH_SIZE #undef WARNING_RATE_LIMIT } /*ARGSUSED*/ static void xnb_free_page(xnb_t *xnbp, mfn_t mfn) { int r; pfn_t pfn; pfn = xen_assign_pfn(mfn); pfnzero(pfn, 0, PAGESIZE); xen_release_pfn(pfn); /* * This happens only in the error path, so batching is * not worth the complication. */ if ((r = balloon_free_pages(1, &mfn, NULL, NULL)) != 1) { cmn_err(CE_WARN, "free_page: cannot decrease memory " "reservation (%d): page kept but unusable (mfn = 0x%lx).", r, mfn); } } /* * Similar to RING_HAS_UNCONSUMED_REQUESTS(&xnbp->rx_ring) but * using local variables. */ #define XNB_RING_HAS_UNCONSUMED_REQUESTS(_r) \ ((((_r)->sring->req_prod - loop) < \ (RING_SIZE(_r) - (loop - prod))) ? \ ((_r)->sring->req_prod - loop) : \ (RING_SIZE(_r) - (loop - prod))) mblk_t * xnb_to_peer(xnb_t *xnbp, mblk_t *mp) { mblk_t *free = mp, *prev = NULL; size_t len; gnttab_transfer_t *gop; boolean_t notify; RING_IDX loop, prod, end; /* * For each packet the sequence of operations is: * * 1. get a new page from the hypervisor. * 2. get a request slot from the ring. * 3. copy the data into the new page. * 4. transfer the page to the peer. * 5. update the request slot. * 6. kick the peer. * 7. free mp. * * In order to reduce the number of hypercalls, we prepare * several packets for the peer and perform a single hypercall * to transfer them. */ mutex_enter(&xnbp->xnb_rx_lock); /* * If we are not connected to the peer or have not yet * finished hotplug it is too early to pass packets to the * peer. */ if (!(xnbp->xnb_connected && xnbp->xnb_hotplugged)) { mutex_exit(&xnbp->xnb_rx_lock); DTRACE_PROBE(flip_rx_too_early); xnbp->xnb_stat_rx_too_early++; return (mp); } loop = xnbp->xnb_rx_ring.req_cons; prod = xnbp->xnb_rx_ring.rsp_prod_pvt; gop = xnbp->xnb_rx_top; while ((mp != NULL) && XNB_RING_HAS_UNCONSUMED_REQUESTS(&xnbp->xnb_rx_ring)) { mfn_t mfn; pfn_t pfn; netif_rx_request_t *rxreq; netif_rx_response_t *rxresp; char *valoop; size_t offset; mblk_t *ml; uint16_t cksum_flags; /* 1 */ if ((mfn = xnb_alloc_page(xnbp)) == 0) { xnbp->xnb_stat_rx_defer++; break; } /* 2 */ rxreq = RING_GET_REQUEST(&xnbp->xnb_rx_ring, loop); #ifdef XNB_DEBUG if (!(rxreq->id < NET_RX_RING_SIZE)) cmn_err(CE_PANIC, "xnb_to_peer: " "id %d out of range in request 0x%p", rxreq->id, (void *)rxreq); #endif /* XNB_DEBUG */ /* Assign a pfn and map the new page at the allocated va. */ pfn = xen_assign_pfn(mfn); hat_devload(kas.a_hat, xnbp->xnb_rx_va, PAGESIZE, pfn, PROT_READ | PROT_WRITE, HAT_LOAD); offset = RX_BUFFER_HEADROOM; /* 3 */ len = 0; valoop = xnbp->xnb_rx_va + offset; for (ml = mp; ml != NULL; ml = ml->b_cont) { size_t chunk = ml->b_wptr - ml->b_rptr; bcopy(ml->b_rptr, valoop, chunk); valoop += chunk; len += chunk; } ASSERT(len + offset < PAGESIZE); /* Release the pfn. */ hat_unload(kas.a_hat, xnbp->xnb_rx_va, PAGESIZE, HAT_UNLOAD_UNMAP); xen_release_pfn(pfn); /* 4 */ gop->mfn = mfn; gop->domid = xnbp->xnb_peer; gop->ref = rxreq->gref; /* 5.1 */ rxresp = RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod); rxresp->offset = offset; rxresp->flags = 0; cksum_flags = xnbp->xnb_flavour->xf_cksum_to_peer(xnbp, mp); if (cksum_flags != 0) xnbp->xnb_stat_rx_cksum_deferred++; rxresp->flags |= cksum_flags; rxresp->id = RING_GET_REQUEST(&xnbp->xnb_rx_ring, prod)->id; rxresp->status = len; loop++; prod++; gop++; prev = mp; mp = mp->b_next; } /* * Did we actually do anything? */ if (loop == xnbp->xnb_rx_ring.req_cons) { mutex_exit(&xnbp->xnb_rx_lock); return (mp); } end = loop; /* * Unlink the end of the 'done' list from the remainder. */ ASSERT(prev != NULL); prev->b_next = NULL; if (HYPERVISOR_grant_table_op(GNTTABOP_transfer, xnbp->xnb_rx_top, loop - xnbp->xnb_rx_ring.req_cons) != 0) { cmn_err(CE_WARN, "xnb_to_peer: transfer operation failed"); } loop = xnbp->xnb_rx_ring.req_cons; prod = xnbp->xnb_rx_ring.rsp_prod_pvt; gop = xnbp->xnb_rx_top; while (loop < end) { int16_t status = NETIF_RSP_OKAY; if (gop->status != 0) { status = NETIF_RSP_ERROR; /* * If the status is anything other than * GNTST_bad_page then we don't own the page * any more, so don't try to give it back. */ if (gop->status != GNTST_bad_page) gop->mfn = 0; } else { /* The page is no longer ours. */ gop->mfn = 0; } if (gop->mfn != 0) /* * Give back the page, as we won't be using * it. */ xnb_free_page(xnbp, gop->mfn); else /* * We gave away a page, update our accounting * now. */ balloon_drv_subtracted(1); /* 5.2 */ if (status != NETIF_RSP_OKAY) { RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod)->status = status; } else { xnbp->xnb_stat_ipackets++; xnbp->xnb_stat_rbytes += len; } loop++; prod++; gop++; } xnbp->xnb_rx_ring.req_cons = loop; xnbp->xnb_rx_ring.rsp_prod_pvt = prod; /* 6 */ /* LINTED: constant in conditional context */ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xnbp->xnb_rx_ring, notify); if (notify) { ec_notify_via_evtchn(xnbp->xnb_evtchn); xnbp->xnb_stat_rx_notify_sent++; } else { xnbp->xnb_stat_rx_notify_deferred++; } if (mp != NULL) xnbp->xnb_stat_rx_defer++; mutex_exit(&xnbp->xnb_rx_lock); /* Free mblk_t's that we consumed. */ freemsgchain(free); return (mp); } /* helper functions for xnb_copy_to_peer */ /* * Grow the array of copy operation descriptors. * Returns a pointer to the next available entry. */ gnttab_copy_t * grow_cpop_area(xnb_t *xnbp, gnttab_copy_t *o_cpop) { /* * o_cpop (arg.1) is a ptr to the area we would like to copy * something into but cannot, because we haven't alloc'ed it * yet, or NULL. * old_cpop and new_cpop (local) are pointers to old/new * versions of xnbp->xnb_rx_cpop. */ gnttab_copy_t *new_cpop, *old_cpop, *ret_cpop; size_t newcount; ASSERT(MUTEX_HELD(&xnbp->xnb_rx_lock)); old_cpop = xnbp->xnb_rx_cpop; /* * o_cpop is a pointer into the array pointed to by old_cpop; * it would be an error for exactly one of these pointers to be NULL. * We shouldn't call this function if xnb_rx_cpop has already * been allocated, but we're starting to fill it from the beginning * again. */ ASSERT((o_cpop == NULL && old_cpop == NULL) || (o_cpop != NULL && old_cpop != NULL && o_cpop != old_cpop)); newcount = xnbp->xnb_cpop_sz + CPOP_DEFCNT; new_cpop = kmem_alloc(sizeof (*new_cpop) * newcount, KM_NOSLEEP); if (new_cpop == NULL) { xnbp->xnb_stat_other_allocation_failure++; return (NULL); } if (o_cpop != NULL) { size_t offset = (o_cpop - old_cpop); /* we only need to move the parts in use ... */ (void) memmove(new_cpop, old_cpop, xnbp->xnb_cpop_sz * (sizeof (*old_cpop))); kmem_free(old_cpop, xnbp->xnb_cpop_sz * sizeof (*old_cpop)); ret_cpop = new_cpop + offset; } else { ret_cpop = new_cpop; } xnbp->xnb_rx_cpop = new_cpop; xnbp->xnb_cpop_sz = newcount; xnbp->xnb_stat_rx_cpoparea_grown++; return (ret_cpop); } /* * Check whether an address is on a page that's foreign to this domain. */ static boolean_t is_foreign(void *addr) { pfn_t pfn = hat_getpfnum(kas.a_hat, addr); return (pfn & PFN_IS_FOREIGN_MFN ? B_TRUE : B_FALSE); } /* * Insert a newly allocated mblk into a chain, replacing the old one. */ static mblk_t * replace_msg(mblk_t *mp, size_t len, mblk_t *mp_prev, mblk_t *ml_prev) { uint32_t start, stuff, end, value, flags; mblk_t *new_mp; new_mp = copyb(mp); if (new_mp == NULL) cmn_err(CE_PANIC, "replace_msg: cannot alloc new message" "for %p, len %lu", (void *) mp, len); hcksum_retrieve(mp, NULL, NULL, &start, &stuff, &end, &value, &flags); (void) hcksum_assoc(new_mp, NULL, NULL, start, stuff, end, value, flags, KM_NOSLEEP); new_mp->b_next = mp->b_next; new_mp->b_prev = mp->b_prev; new_mp->b_cont = mp->b_cont; /* Make sure we only overwrite pointers to the mblk being replaced. */ if (mp_prev != NULL && mp_prev->b_next == mp) mp_prev->b_next = new_mp; if (ml_prev != NULL && ml_prev->b_cont == mp) ml_prev->b_cont = new_mp; mp->b_next = mp->b_prev = mp->b_cont = NULL; freemsg(mp); return (new_mp); } /* * Set all the fields in a gnttab_copy_t. */ static void setup_gop(xnb_t *xnbp, gnttab_copy_t *gp, uchar_t *rptr, size_t s_off, size_t d_off, size_t len, grant_ref_t d_ref) { ASSERT(xnbp != NULL && gp != NULL); gp->source.offset = s_off; gp->source.u.gmfn = pfn_to_mfn(hat_getpfnum(kas.a_hat, (caddr_t)rptr)); gp->source.domid = DOMID_SELF; gp->len = (uint16_t)len; gp->flags = GNTCOPY_dest_gref; gp->status = 0; gp->dest.u.ref = d_ref; gp->dest.offset = d_off; gp->dest.domid = xnbp->xnb_peer; } mblk_t * xnb_copy_to_peer(xnb_t *xnbp, mblk_t *mp) { mblk_t *free = mp, *mp_prev = NULL, *saved_mp = mp; mblk_t *ml, *ml_prev; gnttab_copy_t *gop_cp; boolean_t notify; RING_IDX loop, prod; int i; if (!xnbp->xnb_hv_copy) return (xnb_to_peer(xnbp, mp)); /* * For each packet the sequence of operations is: * * 1. get a request slot from the ring. * 2. set up data for hypercall (see NOTE below) * 3. have the hypervisore copy the data * 4. update the request slot. * 5. kick the peer. * * NOTE ad 2. * In order to reduce the number of hypercalls, we prepare * several packets (mp->b_cont != NULL) for the peer and * perform a single hypercall to transfer them. * We also have to set up a seperate copy operation for * every page. * * If we have more than one message (mp->b_next != NULL), * we do this whole dance repeatedly. */ mutex_enter(&xnbp->xnb_rx_lock); if (!(xnbp->xnb_connected && xnbp->xnb_hotplugged)) { mutex_exit(&xnbp->xnb_rx_lock); DTRACE_PROBE(copy_rx_too_early); xnbp->xnb_stat_rx_too_early++; return (mp); } loop = xnbp->xnb_rx_ring.req_cons; prod = xnbp->xnb_rx_ring.rsp_prod_pvt; while ((mp != NULL) && XNB_RING_HAS_UNCONSUMED_REQUESTS(&xnbp->xnb_rx_ring)) { netif_rx_request_t *rxreq; netif_rx_response_t *rxresp; size_t offset, d_offset; size_t len; uint16_t cksum_flags; int16_t status = NETIF_RSP_OKAY; int item_count; /* 1 */ rxreq = RING_GET_REQUEST(&xnbp->xnb_rx_ring, loop); #ifdef XNB_DEBUG if (!(rxreq->id < NET_RX_RING_SIZE)) cmn_err(CE_PANIC, "xnb_copy_to_peer: " "id %d out of range in request 0x%p", rxreq->id, (void *)rxreq); #endif /* XNB_DEBUG */ /* 2 */ d_offset = offset = RX_BUFFER_HEADROOM; len = 0; item_count = 0; gop_cp = xnbp->xnb_rx_cpop; /* * We walk the b_cont pointers and set up a gop_cp * structure for every page in every data block we have. */ /* 2a */ for (ml = mp, ml_prev = NULL; ml != NULL; ml = ml->b_cont) { size_t chunk = ml->b_wptr - ml->b_rptr; uchar_t *r_tmp, *rpt_align; size_t r_offset; /* * If we get an mblk on a page that doesn't belong to * this domain, get a new mblk to replace the old one. */ if (is_foreign(ml->b_rptr) || is_foreign(ml->b_wptr)) { mblk_t *ml_new = replace_msg(ml, chunk, mp_prev, ml_prev); /* We can still use old ml, but not *ml! */ if (free == ml) free = ml_new; if (mp == ml) mp = ml_new; ml = ml_new; xnbp->xnb_stat_rx_foreign_page++; } rpt_align = (uchar_t *)ALIGN2PAGE(ml->b_rptr); r_offset = (uint16_t)(ml->b_rptr - rpt_align); r_tmp = ml->b_rptr; if (d_offset + chunk > PAGESIZE) cmn_err(CE_PANIC, "xnb_copy_to_peer: mp %p " "(svd: %p), ml %p,rpt_alg. %p, d_offset " "(%lu) + chunk (%lu) > PAGESIZE %d!", (void *)mp, (void *)saved_mp, (void *)ml, (void *)rpt_align, d_offset, chunk, (int)PAGESIZE); while (chunk > 0) { size_t part_len; item_count++; if (item_count > xnbp->xnb_cpop_sz) { gop_cp = grow_cpop_area(xnbp, gop_cp); if (gop_cp == NULL) goto failure; } /* * If our mblk crosses a page boundary, we need * to do a seperate copy for every page. */ if (r_offset + chunk > PAGESIZE) { part_len = PAGESIZE - r_offset; DTRACE_PROBE3(mblk_page_crossed, (mblk_t *), ml, int, chunk, int, (int)r_offset); xnbp->xnb_stat_rx_pagebndry_crossed++; } else { part_len = chunk; } setup_gop(xnbp, gop_cp, r_tmp, r_offset, d_offset, part_len, rxreq->gref); chunk -= part_len; len += part_len; d_offset += part_len; r_tmp += part_len; /* * The 2nd, 3rd ... last copies will always * start at r_tmp, therefore r_offset is 0. */ r_offset = 0; gop_cp++; } ml_prev = ml; DTRACE_PROBE4(mblk_loop_end, (mblk_t *), ml, int, chunk, int, len, int, item_count); } /* 3 */ if (HYPERVISOR_grant_table_op(GNTTABOP_copy, xnbp->xnb_rx_cpop, item_count) != 0) { cmn_err(CE_WARN, "xnb_copy_to_peer: copy op. failed"); DTRACE_PROBE(HV_granttableopfailed); } /* 4 */ rxresp = RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod); rxresp->offset = offset; rxresp->flags = 0; DTRACE_PROBE4(got_RX_rsp, int, (int)rxresp->id, int, (int)rxresp->offset, int, (int)rxresp->flags, int, (int)rxresp->status); cksum_flags = xnbp->xnb_flavour->xf_cksum_to_peer(xnbp, mp); if (cksum_flags != 0) xnbp->xnb_stat_rx_cksum_deferred++; rxresp->flags |= cksum_flags; rxresp->id = RING_GET_REQUEST(&xnbp->xnb_rx_ring, prod)->id; rxresp->status = len; DTRACE_PROBE4(RX_rsp_set, int, (int)rxresp->id, int, (int)rxresp->offset, int, (int)rxresp->flags, int, (int)rxresp->status); for (i = 0; i < item_count; i++) { if (xnbp->xnb_rx_cpop[i].status != 0) { DTRACE_PROBE2(cpop__status__nonnull, int, (int)xnbp->xnb_rx_cpop[i].status, int, i); status = NETIF_RSP_ERROR; } } /* 5.2 */ if (status != NETIF_RSP_OKAY) { RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod)->status = status; xnbp->xnb_stat_rx_rsp_notok++; } else { xnbp->xnb_stat_ipackets++; xnbp->xnb_stat_rbytes += len; } loop++; prod++; mp_prev = mp; mp = mp->b_next; } failure: /* * Did we actually do anything? */ if (loop == xnbp->xnb_rx_ring.req_cons) { mutex_exit(&xnbp->xnb_rx_lock); return (mp); } /* * Unlink the end of the 'done' list from the remainder. */ ASSERT(mp_prev != NULL); mp_prev->b_next = NULL; xnbp->xnb_rx_ring.req_cons = loop; xnbp->xnb_rx_ring.rsp_prod_pvt = prod; /* 6 */ /* LINTED: constant in conditional context */ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xnbp->xnb_rx_ring, notify); if (notify) { ec_notify_via_evtchn(xnbp->xnb_evtchn); xnbp->xnb_stat_rx_notify_sent++; } else { xnbp->xnb_stat_rx_notify_deferred++; } if (mp != NULL) xnbp->xnb_stat_rx_defer++; mutex_exit(&xnbp->xnb_rx_lock); /* Free mblk_t structs we have consumed. */ freemsgchain(free); return (mp); } /*ARGSUSED*/ static int xnb_txbuf_constructor(void *buf, void *arg, int kmflag) { xnb_txbuf_t *txp = buf; bzero(txp, sizeof (*txp)); txp->xt_free_rtn.free_func = xnb_tx_complete; txp->xt_free_rtn.free_arg = (caddr_t)txp; txp->xt_mop.host_addr = (uint64_t)(uintptr_t)vmem_alloc(heap_arena, PAGESIZE, ((kmflag & KM_NOSLEEP) == KM_NOSLEEP) ? VM_NOSLEEP : VM_SLEEP); if (txp->xt_mop.host_addr == NULL) { cmn_err(CE_WARN, "xnb_txbuf_constructor: " "cannot get address space"); return (-1); } /* * Have the hat ensure that page table exists for the VA. */ hat_prepare_mapping(kas.a_hat, (caddr_t)(uintptr_t)txp->xt_mop.host_addr, NULL); return (0); } /*ARGSUSED*/ static void xnb_txbuf_destructor(void *buf, void *arg) { xnb_txbuf_t *txp = buf; ASSERT(txp->xt_mop.host_addr != NULL); ASSERT((txp->xt_flags & XNB_TXBUF_INUSE) == 0); hat_release_mapping(kas.a_hat, (caddr_t)(uintptr_t)txp->xt_mop.host_addr); vmem_free(heap_arena, (caddr_t)(uintptr_t)txp->xt_mop.host_addr, PAGESIZE); } static void xnb_tx_notify_peer(xnb_t *xnbp) { boolean_t notify; ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock)); /* LINTED: constant in conditional context */ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xnbp->xnb_tx_ring, notify); if (notify) { ec_notify_via_evtchn(xnbp->xnb_evtchn); xnbp->xnb_stat_tx_notify_sent++; } else { xnbp->xnb_stat_tx_notify_deferred++; } } static void xnb_tx_complete(xnb_txbuf_t *txp) { xnb_t *xnbp = txp->xt_xnbp; ASSERT((txp->xt_flags & XNB_TXBUF_INUSE) == XNB_TXBUF_INUSE); mutex_enter(&xnbp->xnb_tx_lock); xnb_tx_schedule_unmop(xnbp, &txp->xt_mop, txp); mutex_exit(&xnbp->xnb_tx_lock); } static void xnb_tx_mark_complete(xnb_t *xnbp, RING_IDX id, int16_t status) { RING_IDX i; netif_tx_response_t *txresp; ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock)); i = xnbp->xnb_tx_ring.rsp_prod_pvt; txresp = RING_GET_RESPONSE(&xnbp->xnb_tx_ring, i); txresp->id = id; txresp->status = status; xnbp->xnb_tx_ring.rsp_prod_pvt = i + 1; /* * Note that we don't push the change to the peer here - that * is the callers responsibility. */ } static void xnb_tx_schedule_unmop(xnb_t *xnbp, gnttab_map_grant_ref_t *mop, xnb_txbuf_t *txp) { gnttab_unmap_grant_ref_t *unmop; int u_count; int reqs_on_ring; ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock)); ASSERT(xnbp->xnb_tx_unmop_count < NET_TX_RING_SIZE); u_count = xnbp->xnb_tx_unmop_count++; /* Cache data for the time when we actually unmap grant refs */ xnbp->xnb_tx_unmop_txp[u_count] = txp; unmop = &xnbp->xnb_tx_unmop[u_count]; unmop->host_addr = mop->host_addr; unmop->dev_bus_addr = mop->dev_bus_addr; unmop->handle = mop->handle; /* * We cannot check the ring once we're disconnected from it. Batching * doesn't seem to be a useful optimisation in this case either, * so we directly call into the actual unmap function. */ if (xnbp->xnb_connected) { reqs_on_ring = RING_HAS_UNCONSUMED_REQUESTS(&xnbp->xnb_tx_ring); /* * By tuning xnb_unmop_hiwat to N, we can emulate "N per batch" * or (with N == 1) "immediate unmop" behaviour. * The "> xnb_unmop_lowwat" is a guard against ring exhaustion. */ if (xnbp->xnb_tx_unmop_count < xnb_unmop_hiwat && reqs_on_ring > xnb_unmop_lowwat) return; } xnb_tx_perform_pending_unmop(xnbp); } /* * Here we perform the actual unmapping of the data that was * accumulated in xnb_tx_schedule_unmop(). * Note that it is the caller's responsibility to make sure that * there's actually something there to unmop. */ static void xnb_tx_perform_pending_unmop(xnb_t *xnbp) { RING_IDX loop; #ifdef XNB_DEBUG gnttab_unmap_grant_ref_t *unmop; #endif /* XNB_DEBUG */ ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock)); ASSERT(xnbp->xnb_tx_unmop_count > 0); if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, xnbp->xnb_tx_unmop, xnbp->xnb_tx_unmop_count) < 0) { cmn_err(CE_WARN, "xnb_tx_perform_pending_unmop: " "unmap grant operation failed, " "%d pages lost", xnbp->xnb_tx_unmop_count); } #ifdef XNB_DEBUG for (loop = 0, unmop = xnbp->xnb_tx_unmop; loop < xnbp->xnb_tx_unmop_count; loop++, unmop++) { if (unmop->status != 0) { cmn_err(CE_WARN, "xnb_tx_perform_pending_unmop: " "unmap grant reference failed (%d)", unmop->status); } } #endif /* XNB_DEBUG */ for (loop = 0; loop < xnbp->xnb_tx_unmop_count; loop++) { xnb_txbuf_t *txp = xnbp->xnb_tx_unmop_txp[loop]; if (txp == NULL) cmn_err(CE_PANIC, "xnb_tx_perform_pending_unmop: " "unexpected NULL txp (loop %d; count %d)!", loop, xnbp->xnb_tx_unmop_count); if (xnbp->xnb_connected) xnb_tx_mark_complete(xnbp, txp->xt_id, txp->xt_status); xnb_txbuf_put(xnbp, txp); } if (xnbp->xnb_connected) xnb_tx_notify_peer(xnbp); xnbp->xnb_tx_unmop_count = 0; #ifdef XNB_DEBUG bzero(xnbp->xnb_tx_unmop, sizeof (xnbp->xnb_tx_unmop)); bzero(xnbp->xnb_tx_unmop_txp, sizeof (xnbp->xnb_tx_unmop_txp)); #endif /* XNB_DEBUG */ } static xnb_txbuf_t * xnb_txbuf_get(xnb_t *xnbp, int flags) { xnb_txbuf_t *txp; ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock)); txp = kmem_cache_alloc(xnb_txbuf_cachep, flags); if (txp != NULL) { ASSERT((txp->xt_flags & XNB_TXBUF_INUSE) == 0); txp->xt_flags |= XNB_TXBUF_INUSE; txp->xt_xnbp = xnbp; txp->xt_mop.dom = xnbp->xnb_peer; txp->xt_mop.flags = GNTMAP_host_map; if (!xnbp->xnb_tx_pages_writable) txp->xt_mop.flags |= GNTMAP_readonly; xnbp->xnb_tx_buf_count++; } return (txp); } static void xnb_txbuf_put(xnb_t *xnbp, xnb_txbuf_t *txp) { ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock)); ASSERT((txp->xt_flags & XNB_TXBUF_INUSE) == XNB_TXBUF_INUSE); txp->xt_flags &= ~XNB_TXBUF_INUSE; xnbp->xnb_tx_buf_count--; kmem_cache_free(xnb_txbuf_cachep, txp); } static mblk_t * xnb_from_peer(xnb_t *xnbp) { RING_IDX start, end, loop; gnttab_map_grant_ref_t *mop; xnb_txbuf_t **txpp; netif_tx_request_t *txreq; boolean_t work_to_do; mblk_t *head, *tail; /* * If the peer granted a read-only mapping to the page then we * must copy the data, as the local protocol stack (should the * packet be destined for this host) will modify the packet * 'in place'. */ boolean_t copy = xnbp->xnb_tx_always_copy || !xnbp->xnb_tx_pages_writable; /* * For each individual request, the sequence of actions is: * * 1. get the request. * 2. map the page based on the grant ref. * 3. allocate an mblk, copy the data to it. * 4. release the grant. * 5. update the ring. * 6. pass the packet upward. * 7. kick the peer. * * In fact, we try to perform the grant operations in batches, * so there are two loops. */ head = tail = NULL; around: ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock)); /* LINTED: constant in conditional context */ RING_FINAL_CHECK_FOR_REQUESTS(&xnbp->xnb_tx_ring, work_to_do); if (!work_to_do) { finished: return (head); } start = xnbp->xnb_tx_ring.req_cons; end = xnbp->xnb_tx_ring.sring->req_prod; if ((end - start) > NET_TX_RING_SIZE) { /* * This usually indicates that the frontend driver is * misbehaving, as it's not possible to have more than * NET_TX_RING_SIZE ring elements in play at any one * time. * * We reset the ring pointers to the state declared by * the frontend and try to carry on. */ cmn_err(CE_WARN, "xnb_from_peer: domain %d tried to give us %u " "items in the ring, resetting and trying to recover.", xnbp->xnb_peer, (end - start)); /* LINTED: constant in conditional context */ BACK_RING_ATTACH(&xnbp->xnb_tx_ring, (netif_tx_sring_t *)xnbp->xnb_tx_ring_addr, PAGESIZE); goto around; } for (loop = start, mop = xnbp->xnb_tx_mop, txpp = xnbp->xnb_tx_bufp; loop != end; loop++, mop++, txpp++) { xnb_txbuf_t *txp; txp = xnb_txbuf_get(xnbp, KM_NOSLEEP); if (txp == NULL) break; ASSERT(xnbp->xnb_tx_pages_writable || ((txp->xt_mop.flags & GNTMAP_readonly) == GNTMAP_readonly)); txp->xt_mop.ref = RING_GET_REQUEST(&xnbp->xnb_tx_ring, loop)->gref; *mop = txp->xt_mop; *txpp = txp; } if ((loop - start) == 0) goto finished; end = loop; if (xen_map_gref(GNTTABOP_map_grant_ref, xnbp->xnb_tx_mop, end - start, B_FALSE) != 0) { cmn_err(CE_WARN, "xnb_from_peer: map grant operation failed"); loop = start; txpp = xnbp->xnb_tx_bufp; while (loop != end) { xnb_txbuf_put(xnbp, *txpp); loop++; txpp++; } goto finished; } for (loop = start, mop = xnbp->xnb_tx_mop, txpp = xnbp->xnb_tx_bufp; loop != end; loop++, mop++, txpp++) { mblk_t *mp = NULL; int16_t status = NETIF_RSP_OKAY; xnb_txbuf_t *txp = *txpp; if (mop->status != 0) { cmn_err(CE_WARN, "xnb_from_peer: " "failed to map buffer: %d", mop->status); status = NETIF_RSP_ERROR; } txreq = RING_GET_REQUEST(&xnbp->xnb_tx_ring, loop); if (status == NETIF_RSP_OKAY) { if (copy) { mp = allocb(txreq->size, BPRI_MED); if (mp == NULL) { status = NETIF_RSP_ERROR; xnbp->xnb_stat_tx_allocb_failed++; } else { bcopy((caddr_t)(uintptr_t) mop->host_addr + txreq->offset, mp->b_wptr, txreq->size); mp->b_wptr += txreq->size; } } else { mp = desballoc((uchar_t *)(uintptr_t) mop->host_addr + txreq->offset, txreq->size, 0, &txp->xt_free_rtn); if (mp == NULL) { status = NETIF_RSP_ERROR; xnbp->xnb_stat_tx_allocb_failed++; } else { txp->xt_id = txreq->id; txp->xt_status = status; txp->xt_mop = *mop; mp->b_wptr += txreq->size; } } /* * If we have a buffer and there are checksum * flags, process them appropriately. */ if ((mp != NULL) && ((txreq->flags & (NETTXF_csum_blank | NETTXF_data_validated)) != 0)) { mp = xnbp->xnb_flavour->xf_cksum_from_peer(xnbp, mp, txreq->flags); xnbp->xnb_stat_tx_cksum_no_need++; } } if (copy || (mp == NULL)) { txp->xt_status = status; txp->xt_id = txreq->id; xnb_tx_schedule_unmop(xnbp, mop, txp); } if (mp != NULL) { xnbp->xnb_stat_opackets++; xnbp->xnb_stat_obytes += txreq->size; mp->b_next = NULL; if (head == NULL) { ASSERT(tail == NULL); head = mp; } else { ASSERT(tail != NULL); tail->b_next = mp; } tail = mp; } } xnbp->xnb_tx_ring.req_cons = loop; goto around; /* NOTREACHED */ } /* * intr() -- ring interrupt service routine */ static uint_t xnb_intr(caddr_t arg) { xnb_t *xnbp = (xnb_t *)arg; mblk_t *mp; xnbp->xnb_stat_intr++; mutex_enter(&xnbp->xnb_tx_lock); ASSERT(xnbp->xnb_connected); mp = xnb_from_peer(xnbp); mutex_exit(&xnbp->xnb_tx_lock); if (!xnbp->xnb_hotplugged) { xnbp->xnb_stat_tx_too_early++; goto fail; } if (mp == NULL) { xnbp->xnb_stat_spurious_intr++; goto fail; } xnbp->xnb_flavour->xf_from_peer(xnbp, mp); return (DDI_INTR_CLAIMED); fail: freemsgchain(mp); return (DDI_INTR_CLAIMED); } static boolean_t xnb_connect_rings(dev_info_t *dip) { xnb_t *xnbp = ddi_get_driver_private(dip); char *oename; struct gnttab_map_grant_ref map_op; evtchn_port_t evtchn; int i; /* * Cannot attempt to connect the rings if already connected. */ ASSERT(!xnbp->xnb_connected); oename = xvdi_get_oename(dip); if (xenbus_gather(XBT_NULL, oename, "event-channel", "%u", &evtchn, "tx-ring-ref", "%lu", &xnbp->xnb_tx_ring_ref, "rx-ring-ref", "%lu", &xnbp->xnb_rx_ring_ref, NULL) != 0) { cmn_err(CE_WARN, "xnb_connect_rings: " "cannot read other-end details from %s", oename); goto fail; } if (xenbus_scanf(XBT_NULL, oename, "feature-tx-writable", "%d", &i) != 0) i = 0; if (i != 0) xnbp->xnb_tx_pages_writable = B_TRUE; if (xenbus_scanf(XBT_NULL, oename, "feature-no-csum-offload", "%d", &i) != 0) i = 0; if ((i == 1) || !xnbp->xnb_cksum_offload) xnbp->xnb_cksum_offload = B_FALSE; /* Check whether our peer knows and requests hypervisor copy */ if (xenbus_scanf(XBT_NULL, oename, "request-rx-copy", "%d", &i) != 0) i = 0; if (i != 0) xnbp->xnb_hv_copy = B_TRUE; /* * 1. allocate a vaddr for the tx page, one for the rx page. * 2. call GNTTABOP_map_grant_ref to map the relevant pages * into the allocated vaddr (one for tx, one for rx). * 3. call EVTCHNOP_bind_interdomain to have the event channel * bound to this domain. * 4. associate the event channel with an interrupt. * 5. declare ourselves connected. * 6. enable the interrupt. */ /* 1.tx */ xnbp->xnb_tx_ring_addr = vmem_xalloc(heap_arena, PAGESIZE, PAGESIZE, 0, 0, 0, 0, VM_SLEEP); ASSERT(xnbp->xnb_tx_ring_addr != NULL); /* 2.tx */ map_op.host_addr = (uint64_t)((long)xnbp->xnb_tx_ring_addr); map_op.flags = GNTMAP_host_map; map_op.ref = xnbp->xnb_tx_ring_ref; map_op.dom = xnbp->xnb_peer; hat_prepare_mapping(kas.a_hat, xnbp->xnb_tx_ring_addr, NULL); if (xen_map_gref(GNTTABOP_map_grant_ref, &map_op, 1, B_FALSE) != 0 || map_op.status != 0) { cmn_err(CE_WARN, "xnb_connect_rings: cannot map tx-ring page."); goto fail; } xnbp->xnb_tx_ring_handle = map_op.handle; /* LINTED: constant in conditional context */ BACK_RING_INIT(&xnbp->xnb_tx_ring, (netif_tx_sring_t *)xnbp->xnb_tx_ring_addr, PAGESIZE); /* 1.rx */ xnbp->xnb_rx_ring_addr = vmem_xalloc(heap_arena, PAGESIZE, PAGESIZE, 0, 0, 0, 0, VM_SLEEP); ASSERT(xnbp->xnb_rx_ring_addr != NULL); /* 2.rx */ map_op.host_addr = (uint64_t)((long)xnbp->xnb_rx_ring_addr); map_op.flags = GNTMAP_host_map; map_op.ref = xnbp->xnb_rx_ring_ref; map_op.dom = xnbp->xnb_peer; hat_prepare_mapping(kas.a_hat, xnbp->xnb_rx_ring_addr, NULL); if (xen_map_gref(GNTTABOP_map_grant_ref, &map_op, 1, B_FALSE) != 0 || map_op.status != 0) { cmn_err(CE_WARN, "xnb_connect_rings: cannot map rx-ring page."); goto fail; } xnbp->xnb_rx_ring_handle = map_op.handle; /* LINTED: constant in conditional context */ BACK_RING_INIT(&xnbp->xnb_rx_ring, (netif_rx_sring_t *)xnbp->xnb_rx_ring_addr, PAGESIZE); /* 3 */ if (xvdi_bind_evtchn(dip, evtchn) != DDI_SUCCESS) { cmn_err(CE_WARN, "xnb_connect_rings: " "cannot bind event channel %d", xnbp->xnb_evtchn); xnbp->xnb_evtchn = INVALID_EVTCHN; goto fail; } xnbp->xnb_evtchn = xvdi_get_evtchn(dip); /* * It would be good to set the state to XenbusStateConnected * here as well, but then what if ddi_add_intr() failed? * Changing the state in the store will be noticed by the peer * and cannot be "taken back". */ mutex_enter(&xnbp->xnb_tx_lock); mutex_enter(&xnbp->xnb_rx_lock); /* 5.1 */ xnbp->xnb_connected = B_TRUE; mutex_exit(&xnbp->xnb_rx_lock); mutex_exit(&xnbp->xnb_tx_lock); /* 4, 6 */ if (ddi_add_intr(dip, 0, NULL, NULL, xnb_intr, (caddr_t)xnbp) != DDI_SUCCESS) { cmn_err(CE_WARN, "xnb_connect_rings: cannot add interrupt"); goto fail; } xnbp->xnb_irq = B_TRUE; /* 5.2 */ (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateConnected); return (B_TRUE); fail: mutex_enter(&xnbp->xnb_tx_lock); mutex_enter(&xnbp->xnb_rx_lock); xnbp->xnb_connected = B_FALSE; mutex_exit(&xnbp->xnb_rx_lock); mutex_exit(&xnbp->xnb_tx_lock); return (B_FALSE); } static void xnb_disconnect_rings(dev_info_t *dip) { xnb_t *xnbp = ddi_get_driver_private(dip); if (xnbp->xnb_irq) { ddi_remove_intr(dip, 0, NULL); xnbp->xnb_irq = B_FALSE; } if (xnbp->xnb_tx_unmop_count > 0) xnb_tx_perform_pending_unmop(xnbp); if (xnbp->xnb_evtchn != INVALID_EVTCHN) { xvdi_free_evtchn(dip); xnbp->xnb_evtchn = INVALID_EVTCHN; } if (xnbp->xnb_rx_ring_handle != INVALID_GRANT_HANDLE) { struct gnttab_unmap_grant_ref unmap_op; unmap_op.host_addr = (uint64_t)(uintptr_t) xnbp->xnb_rx_ring_addr; unmap_op.dev_bus_addr = 0; unmap_op.handle = xnbp->xnb_rx_ring_handle; if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &unmap_op, 1) != 0) cmn_err(CE_WARN, "xnb_disconnect_rings: " "cannot unmap rx-ring page (%d)", unmap_op.status); xnbp->xnb_rx_ring_handle = INVALID_GRANT_HANDLE; } if (xnbp->xnb_rx_ring_addr != NULL) { hat_release_mapping(kas.a_hat, xnbp->xnb_rx_ring_addr); vmem_free(heap_arena, xnbp->xnb_rx_ring_addr, PAGESIZE); xnbp->xnb_rx_ring_addr = NULL; } if (xnbp->xnb_tx_ring_handle != INVALID_GRANT_HANDLE) { struct gnttab_unmap_grant_ref unmap_op; unmap_op.host_addr = (uint64_t)(uintptr_t) xnbp->xnb_tx_ring_addr; unmap_op.dev_bus_addr = 0; unmap_op.handle = xnbp->xnb_tx_ring_handle; if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &unmap_op, 1) != 0) cmn_err(CE_WARN, "xnb_disconnect_rings: " "cannot unmap tx-ring page (%d)", unmap_op.status); xnbp->xnb_tx_ring_handle = INVALID_GRANT_HANDLE; } if (xnbp->xnb_tx_ring_addr != NULL) { hat_release_mapping(kas.a_hat, xnbp->xnb_tx_ring_addr); vmem_free(heap_arena, xnbp->xnb_tx_ring_addr, PAGESIZE); xnbp->xnb_tx_ring_addr = NULL; } } /*ARGSUSED*/ static void xnb_oe_state_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, void *impl_data) { xnb_t *xnbp = ddi_get_driver_private(dip); XenbusState new_state = *(XenbusState *)impl_data; ASSERT(xnbp != NULL); switch (new_state) { case XenbusStateConnected: /* spurious state change */ if (xnbp->xnb_connected) return; if (xnb_connect_rings(dip)) { xnbp->xnb_flavour->xf_peer_connected(xnbp); } else { xnbp->xnb_flavour->xf_peer_disconnected(xnbp); xnb_disconnect_rings(dip); (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosed); (void) xvdi_post_event(dip, XEN_HP_REMOVE); } /* * Now that we've attempted to connect it's reasonable * to allow an attempt to detach. */ xnbp->xnb_detachable = B_TRUE; break; case XenbusStateClosing: (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosing); break; case XenbusStateClosed: xnbp->xnb_flavour->xf_peer_disconnected(xnbp); mutex_enter(&xnbp->xnb_tx_lock); mutex_enter(&xnbp->xnb_rx_lock); xnb_disconnect_rings(dip); xnbp->xnb_connected = B_FALSE; mutex_exit(&xnbp->xnb_rx_lock); mutex_exit(&xnbp->xnb_tx_lock); (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosed); (void) xvdi_post_event(dip, XEN_HP_REMOVE); /* * In all likelyhood this is already set (in the above * case), but if the peer never attempted to connect * and the domain is destroyed we get here without * having been through the case above, so we set it to * be sure. */ xnbp->xnb_detachable = B_TRUE; break; default: break; } } /*ARGSUSED*/ static void xnb_hp_state_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, void *impl_data) { xnb_t *xnbp = ddi_get_driver_private(dip); xendev_hotplug_state_t state = *(xendev_hotplug_state_t *)impl_data; boolean_t success; ASSERT(xnbp != NULL); switch (state) { case Connected: /* spurious hotplug event */ if (xnbp->xnb_hotplugged) return; success = xnbp->xnb_flavour->xf_hotplug_connected(xnbp); mutex_enter(&xnbp->xnb_tx_lock); mutex_enter(&xnbp->xnb_rx_lock); xnbp->xnb_hotplugged = success; mutex_exit(&xnbp->xnb_rx_lock); mutex_exit(&xnbp->xnb_tx_lock); break; default: break; } } static struct modldrv modldrv = { &mod_miscops, "xnb", }; static struct modlinkage modlinkage = { MODREV_1, &modldrv, NULL }; int _init(void) { int i; mutex_init(&xnb_alloc_page_lock, NULL, MUTEX_DRIVER, NULL); xnb_txbuf_cachep = kmem_cache_create("xnb_txbuf_cachep", sizeof (xnb_txbuf_t), 0, xnb_txbuf_constructor, xnb_txbuf_destructor, NULL, NULL, NULL, 0); ASSERT(xnb_txbuf_cachep != NULL); i = mod_install(&modlinkage); if (i != DDI_SUCCESS) { kmem_cache_destroy(xnb_txbuf_cachep); mutex_destroy(&xnb_alloc_page_lock); } return (i); } int _info(struct modinfo *modinfop) { return (mod_info(&modlinkage, modinfop)); } int _fini(void) { int i; i = mod_remove(&modlinkage); if (i == DDI_SUCCESS) { kmem_cache_destroy(xnb_txbuf_cachep); mutex_destroy(&xnb_alloc_page_lock); } return (i); }