2178 lines
53 KiB
C
2178 lines
53 KiB
C
/*-
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* Copyright (c) 2004-2006 Kip Macy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sockio.h>
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#include <sys/limits.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/bpf.h>
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#include <net/if_types.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/if_ether.h>
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#if __FreeBSD_version >= 700000
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#include <netinet/tcp.h>
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#include <netinet/tcp_lro.h>
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#endif
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/clock.h> /* for DELAY */
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <machine/frame.h>
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#include <machine/vmparam.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <machine/intr_machdep.h>
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#include <xen/xen-os.h>
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#include <xen/hypervisor.h>
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#include <xen/xen_intr.h>
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#include <xen/gnttab.h>
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#include <xen/interface/memory.h>
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#include <xen/interface/io/netif.h>
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#include <xen/xenbus/xenbusvar.h>
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#include "xenbus_if.h"
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/* Features supported by all backends. TSO and LRO can be negotiated */
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#define XN_CSUM_FEATURES (CSUM_TCP | CSUM_UDP)
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#define NET_TX_RING_SIZE __RING_SIZE((netif_tx_sring_t *)0, PAGE_SIZE)
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#define NET_RX_RING_SIZE __RING_SIZE((netif_rx_sring_t *)0, PAGE_SIZE)
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#if __FreeBSD_version >= 700000
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/*
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* Should the driver do LRO on the RX end
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* this can be toggled on the fly, but the
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* interface must be reset (down/up) for it
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* to take effect.
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*/
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static int xn_enable_lro = 1;
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TUNABLE_INT("hw.xn.enable_lro", &xn_enable_lro);
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#else
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#define IFCAP_TSO4 0
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#define CSUM_TSO 0
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#endif
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#ifdef CONFIG_XEN
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static int MODPARM_rx_copy = 0;
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module_param_named(rx_copy, MODPARM_rx_copy, bool, 0);
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MODULE_PARM_DESC(rx_copy, "Copy packets from network card (rather than flip)");
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static int MODPARM_rx_flip = 0;
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module_param_named(rx_flip, MODPARM_rx_flip, bool, 0);
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MODULE_PARM_DESC(rx_flip, "Flip packets from network card (rather than copy)");
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#else
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static const int MODPARM_rx_copy = 1;
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static const int MODPARM_rx_flip = 0;
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#endif
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/**
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* \brief The maximum allowed data fragments in a single transmit
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* request.
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*
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* This limit is imposed by the backend driver. We assume here that
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* we are dealing with a Linux driver domain and have set our limit
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* to mirror the Linux MAX_SKB_FRAGS constant.
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*/
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#define MAX_TX_REQ_FRAGS (65536 / PAGE_SIZE + 2)
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#define RX_COPY_THRESHOLD 256
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#define net_ratelimit() 0
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struct netfront_info;
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struct netfront_rx_info;
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static void xn_txeof(struct netfront_info *);
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static void xn_rxeof(struct netfront_info *);
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static void network_alloc_rx_buffers(struct netfront_info *);
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static void xn_tick_locked(struct netfront_info *);
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static void xn_tick(void *);
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static void xn_intr(void *);
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static inline int xn_count_frags(struct mbuf *m);
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static int xn_assemble_tx_request(struct netfront_info *sc,
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struct mbuf *m_head);
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static void xn_start_locked(struct ifnet *);
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static void xn_start(struct ifnet *);
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static int xn_ioctl(struct ifnet *, u_long, caddr_t);
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static void xn_ifinit_locked(struct netfront_info *);
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static void xn_ifinit(void *);
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static void xn_stop(struct netfront_info *);
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static void xn_query_features(struct netfront_info *np);
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static int xn_configure_features(struct netfront_info *np);
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#ifdef notyet
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static void xn_watchdog(struct ifnet *);
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#endif
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#ifdef notyet
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static void netfront_closing(device_t dev);
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#endif
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static void netif_free(struct netfront_info *info);
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static int netfront_detach(device_t dev);
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static int talk_to_backend(device_t dev, struct netfront_info *info);
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static int create_netdev(device_t dev);
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static void netif_disconnect_backend(struct netfront_info *info);
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static int setup_device(device_t dev, struct netfront_info *info);
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static void free_ring(int *ref, void *ring_ptr_ref);
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static int xn_ifmedia_upd(struct ifnet *ifp);
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static void xn_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
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/* Xenolinux helper functions */
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int network_connect(struct netfront_info *);
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static void xn_free_rx_ring(struct netfront_info *);
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static void xn_free_tx_ring(struct netfront_info *);
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static int xennet_get_responses(struct netfront_info *np,
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struct netfront_rx_info *rinfo, RING_IDX rp, RING_IDX *cons,
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struct mbuf **list, int *pages_flipped_p);
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#define virt_to_mfn(x) (vtophys(x) >> PAGE_SHIFT)
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#define INVALID_P2M_ENTRY (~0UL)
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/*
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* Mbuf pointers. We need these to keep track of the virtual addresses
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* of our mbuf chains since we can only convert from virtual to physical,
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* not the other way around. The size must track the free index arrays.
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*/
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struct xn_chain_data {
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struct mbuf *xn_tx_chain[NET_TX_RING_SIZE+1];
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int xn_tx_chain_cnt;
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struct mbuf *xn_rx_chain[NET_RX_RING_SIZE+1];
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};
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struct net_device_stats
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{
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u_long rx_packets; /* total packets received */
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u_long tx_packets; /* total packets transmitted */
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u_long rx_bytes; /* total bytes received */
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u_long tx_bytes; /* total bytes transmitted */
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u_long rx_errors; /* bad packets received */
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u_long tx_errors; /* packet transmit problems */
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u_long rx_dropped; /* no space in linux buffers */
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u_long tx_dropped; /* no space available in linux */
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u_long multicast; /* multicast packets received */
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u_long collisions;
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/* detailed rx_errors: */
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u_long rx_length_errors;
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u_long rx_over_errors; /* receiver ring buff overflow */
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u_long rx_crc_errors; /* recved pkt with crc error */
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u_long rx_frame_errors; /* recv'd frame alignment error */
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u_long rx_fifo_errors; /* recv'r fifo overrun */
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u_long rx_missed_errors; /* receiver missed packet */
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/* detailed tx_errors */
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u_long tx_aborted_errors;
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u_long tx_carrier_errors;
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u_long tx_fifo_errors;
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u_long tx_heartbeat_errors;
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u_long tx_window_errors;
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/* for cslip etc */
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u_long rx_compressed;
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u_long tx_compressed;
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};
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struct netfront_info {
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struct ifnet *xn_ifp;
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#if __FreeBSD_version >= 700000
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struct lro_ctrl xn_lro;
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#endif
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struct net_device_stats stats;
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u_int tx_full;
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netif_tx_front_ring_t tx;
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netif_rx_front_ring_t rx;
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struct mtx tx_lock;
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struct mtx rx_lock;
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struct mtx sc_lock;
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xen_intr_handle_t xen_intr_handle;
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u_int copying_receiver;
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u_int carrier;
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u_int maxfrags;
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/* Receive-ring batched refills. */
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#define RX_MIN_TARGET 32
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#define RX_MAX_TARGET NET_RX_RING_SIZE
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int rx_min_target;
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int rx_max_target;
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int rx_target;
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grant_ref_t gref_tx_head;
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grant_ref_t grant_tx_ref[NET_TX_RING_SIZE + 1];
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grant_ref_t gref_rx_head;
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grant_ref_t grant_rx_ref[NET_TX_RING_SIZE + 1];
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device_t xbdev;
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int tx_ring_ref;
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int rx_ring_ref;
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uint8_t mac[ETHER_ADDR_LEN];
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struct xn_chain_data xn_cdata; /* mbufs */
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struct mbufq xn_rx_batch; /* batch queue */
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int xn_if_flags;
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struct callout xn_stat_ch;
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u_long rx_pfn_array[NET_RX_RING_SIZE];
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struct ifmedia sc_media;
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bool xn_resume;
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};
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#define rx_mbufs xn_cdata.xn_rx_chain
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#define tx_mbufs xn_cdata.xn_tx_chain
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#define XN_LOCK_INIT(_sc, _name) \
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mtx_init(&(_sc)->tx_lock, #_name"_tx", "network transmit lock", MTX_DEF); \
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mtx_init(&(_sc)->rx_lock, #_name"_rx", "network receive lock", MTX_DEF); \
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mtx_init(&(_sc)->sc_lock, #_name"_sc", "netfront softc lock", MTX_DEF)
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#define XN_RX_LOCK(_sc) mtx_lock(&(_sc)->rx_lock)
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#define XN_RX_UNLOCK(_sc) mtx_unlock(&(_sc)->rx_lock)
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#define XN_TX_LOCK(_sc) mtx_lock(&(_sc)->tx_lock)
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#define XN_TX_UNLOCK(_sc) mtx_unlock(&(_sc)->tx_lock)
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#define XN_LOCK(_sc) mtx_lock(&(_sc)->sc_lock);
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#define XN_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_lock);
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#define XN_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_lock, MA_OWNED);
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#define XN_RX_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->rx_lock, MA_OWNED);
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#define XN_TX_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->tx_lock, MA_OWNED);
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#define XN_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->rx_lock); \
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mtx_destroy(&(_sc)->tx_lock); \
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mtx_destroy(&(_sc)->sc_lock);
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struct netfront_rx_info {
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struct netif_rx_response rx;
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struct netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
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};
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#define netfront_carrier_on(netif) ((netif)->carrier = 1)
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#define netfront_carrier_off(netif) ((netif)->carrier = 0)
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#define netfront_carrier_ok(netif) ((netif)->carrier)
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/* Access macros for acquiring freeing slots in xn_free_{tx,rx}_idxs[]. */
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static inline void
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add_id_to_freelist(struct mbuf **list, uintptr_t id)
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{
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KASSERT(id != 0,
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("%s: the head item (0) must always be free.", __func__));
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list[id] = list[0];
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list[0] = (struct mbuf *)id;
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}
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static inline unsigned short
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get_id_from_freelist(struct mbuf **list)
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{
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uintptr_t id;
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id = (uintptr_t)list[0];
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KASSERT(id != 0,
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("%s: the head item (0) must always remain free.", __func__));
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list[0] = list[id];
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return (id);
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}
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static inline int
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xennet_rxidx(RING_IDX idx)
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{
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return idx & (NET_RX_RING_SIZE - 1);
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}
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static inline struct mbuf *
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xennet_get_rx_mbuf(struct netfront_info *np, RING_IDX ri)
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{
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int i = xennet_rxidx(ri);
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struct mbuf *m;
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m = np->rx_mbufs[i];
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np->rx_mbufs[i] = NULL;
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return (m);
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}
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static inline grant_ref_t
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xennet_get_rx_ref(struct netfront_info *np, RING_IDX ri)
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{
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int i = xennet_rxidx(ri);
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grant_ref_t ref = np->grant_rx_ref[i];
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KASSERT(ref != GRANT_REF_INVALID, ("Invalid grant reference!\n"));
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np->grant_rx_ref[i] = GRANT_REF_INVALID;
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return ref;
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}
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#define IPRINTK(fmt, args...) \
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printf("[XEN] " fmt, ##args)
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#ifdef INVARIANTS
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#define WPRINTK(fmt, args...) \
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printf("[XEN] " fmt, ##args)
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#else
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#define WPRINTK(fmt, args...)
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#endif
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#ifdef DEBUG
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#define DPRINTK(fmt, args...) \
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printf("[XEN] %s: " fmt, __func__, ##args)
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#else
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#define DPRINTK(fmt, args...)
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#endif
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/**
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* Read the 'mac' node at the given device's node in the store, and parse that
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* as colon-separated octets, placing result the given mac array. mac must be
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* a preallocated array of length ETH_ALEN (as declared in linux/if_ether.h).
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* Return 0 on success, or errno on error.
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*/
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static int
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xen_net_read_mac(device_t dev, uint8_t mac[])
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{
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int error, i;
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char *s, *e, *macstr;
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const char *path;
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path = xenbus_get_node(dev);
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error = xs_read(XST_NIL, path, "mac", NULL, (void **) &macstr);
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if (error == ENOENT) {
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/*
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* Deal with missing mac XenStore nodes on devices with
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* HVM emulation (the 'ioemu' configuration attribute)
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* enabled.
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*
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* The HVM emulator may execute in a stub device model
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* domain which lacks the permission, only given to Dom0,
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* to update the guest's XenStore tree. For this reason,
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* the HVM emulator doesn't even attempt to write the
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* front-side mac node, even when operating in Dom0.
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* However, there should always be a mac listed in the
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* backend tree. Fallback to this version if our query
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* of the front side XenStore location doesn't find
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* anything.
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*/
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path = xenbus_get_otherend_path(dev);
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error = xs_read(XST_NIL, path, "mac", NULL, (void **) &macstr);
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}
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if (error != 0) {
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xenbus_dev_fatal(dev, error, "parsing %s/mac", path);
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return (error);
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}
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s = macstr;
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for (i = 0; i < ETHER_ADDR_LEN; i++) {
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mac[i] = strtoul(s, &e, 16);
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if (s == e || (e[0] != ':' && e[0] != 0)) {
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free(macstr, M_XENBUS);
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return (ENOENT);
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}
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s = &e[1];
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}
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free(macstr, M_XENBUS);
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return (0);
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}
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/**
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* Entry point to this code when a new device is created. Allocate the basic
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* structures and the ring buffers for communication with the backend, and
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* inform the backend of the appropriate details for those. Switch to
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* Connected state.
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*/
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static int
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netfront_probe(device_t dev)
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{
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if (xen_hvm_domain() && xen_disable_pv_nics != 0)
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return (ENXIO);
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if (!strcmp(xenbus_get_type(dev), "vif")) {
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device_set_desc(dev, "Virtual Network Interface");
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return (0);
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}
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return (ENXIO);
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}
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static int
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netfront_attach(device_t dev)
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{
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int err;
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err = create_netdev(dev);
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if (err) {
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xenbus_dev_fatal(dev, err, "creating netdev");
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return (err);
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}
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#if __FreeBSD_version >= 700000
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SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
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SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
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OID_AUTO, "enable_lro", CTLFLAG_RW,
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&xn_enable_lro, 0, "Large Receive Offload");
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#endif
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return (0);
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}
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static int
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netfront_suspend(device_t dev)
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{
|
|
struct netfront_info *info = device_get_softc(dev);
|
|
|
|
XN_RX_LOCK(info);
|
|
XN_TX_LOCK(info);
|
|
netfront_carrier_off(info);
|
|
XN_TX_UNLOCK(info);
|
|
XN_RX_UNLOCK(info);
|
|
return (0);
|
|
}
|
|
|
|
/**
|
|
* We are reconnecting to the backend, due to a suspend/resume, or a backend
|
|
* driver restart. We tear down our netif structure and recreate it, but
|
|
* leave the device-layer structures intact so that this is transparent to the
|
|
* rest of the kernel.
|
|
*/
|
|
static int
|
|
netfront_resume(device_t dev)
|
|
{
|
|
struct netfront_info *info = device_get_softc(dev);
|
|
|
|
info->xn_resume = true;
|
|
netif_disconnect_backend(info);
|
|
return (0);
|
|
}
|
|
|
|
/* Common code used when first setting up, and when resuming. */
|
|
static int
|
|
talk_to_backend(device_t dev, struct netfront_info *info)
|
|
{
|
|
const char *message;
|
|
struct xs_transaction xst;
|
|
const char *node = xenbus_get_node(dev);
|
|
int err;
|
|
|
|
err = xen_net_read_mac(dev, info->mac);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err, "parsing %s/mac", node);
|
|
goto out;
|
|
}
|
|
|
|
/* Create shared ring, alloc event channel. */
|
|
err = setup_device(dev, info);
|
|
if (err)
|
|
goto out;
|
|
|
|
again:
|
|
err = xs_transaction_start(&xst);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err, "starting transaction");
|
|
goto destroy_ring;
|
|
}
|
|
err = xs_printf(xst, node, "tx-ring-ref","%u",
|
|
info->tx_ring_ref);
|
|
if (err) {
|
|
message = "writing tx ring-ref";
|
|
goto abort_transaction;
|
|
}
|
|
err = xs_printf(xst, node, "rx-ring-ref","%u",
|
|
info->rx_ring_ref);
|
|
if (err) {
|
|
message = "writing rx ring-ref";
|
|
goto abort_transaction;
|
|
}
|
|
err = xs_printf(xst, node,
|
|
"event-channel", "%u",
|
|
xen_intr_port(info->xen_intr_handle));
|
|
if (err) {
|
|
message = "writing event-channel";
|
|
goto abort_transaction;
|
|
}
|
|
err = xs_printf(xst, node, "request-rx-copy", "%u",
|
|
info->copying_receiver);
|
|
if (err) {
|
|
message = "writing request-rx-copy";
|
|
goto abort_transaction;
|
|
}
|
|
err = xs_printf(xst, node, "feature-rx-notify", "%d", 1);
|
|
if (err) {
|
|
message = "writing feature-rx-notify";
|
|
goto abort_transaction;
|
|
}
|
|
err = xs_printf(xst, node, "feature-sg", "%d", 1);
|
|
if (err) {
|
|
message = "writing feature-sg";
|
|
goto abort_transaction;
|
|
}
|
|
#if __FreeBSD_version >= 700000
|
|
err = xs_printf(xst, node, "feature-gso-tcpv4", "%d", 1);
|
|
if (err) {
|
|
message = "writing feature-gso-tcpv4";
|
|
goto abort_transaction;
|
|
}
|
|
#endif
|
|
|
|
err = xs_transaction_end(xst, 0);
|
|
if (err) {
|
|
if (err == EAGAIN)
|
|
goto again;
|
|
xenbus_dev_fatal(dev, err, "completing transaction");
|
|
goto destroy_ring;
|
|
}
|
|
|
|
return 0;
|
|
|
|
abort_transaction:
|
|
xs_transaction_end(xst, 1);
|
|
xenbus_dev_fatal(dev, err, "%s", message);
|
|
destroy_ring:
|
|
netif_free(info);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
setup_device(device_t dev, struct netfront_info *info)
|
|
{
|
|
netif_tx_sring_t *txs;
|
|
netif_rx_sring_t *rxs;
|
|
int error;
|
|
|
|
info->tx_ring_ref = GRANT_REF_INVALID;
|
|
info->rx_ring_ref = GRANT_REF_INVALID;
|
|
info->rx.sring = NULL;
|
|
info->tx.sring = NULL;
|
|
|
|
txs = (netif_tx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO);
|
|
if (!txs) {
|
|
error = ENOMEM;
|
|
xenbus_dev_fatal(dev, error, "allocating tx ring page");
|
|
goto fail;
|
|
}
|
|
SHARED_RING_INIT(txs);
|
|
FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
|
|
error = xenbus_grant_ring(dev, virt_to_mfn(txs), &info->tx_ring_ref);
|
|
if (error)
|
|
goto fail;
|
|
|
|
rxs = (netif_rx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO);
|
|
if (!rxs) {
|
|
error = ENOMEM;
|
|
xenbus_dev_fatal(dev, error, "allocating rx ring page");
|
|
goto fail;
|
|
}
|
|
SHARED_RING_INIT(rxs);
|
|
FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
|
|
|
|
error = xenbus_grant_ring(dev, virt_to_mfn(rxs), &info->rx_ring_ref);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = xen_intr_alloc_and_bind_local_port(dev,
|
|
xenbus_get_otherend_id(dev), /*filter*/NULL, xn_intr, info,
|
|
INTR_TYPE_NET | INTR_MPSAFE | INTR_ENTROPY, &info->xen_intr_handle);
|
|
|
|
if (error) {
|
|
xenbus_dev_fatal(dev, error,
|
|
"xen_intr_alloc_and_bind_local_port failed");
|
|
goto fail;
|
|
}
|
|
|
|
return (0);
|
|
|
|
fail:
|
|
netif_free(info);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef INET
|
|
/**
|
|
* If this interface has an ipv4 address, send an arp for it. This
|
|
* helps to get the network going again after migrating hosts.
|
|
*/
|
|
static void
|
|
netfront_send_fake_arp(device_t dev, struct netfront_info *info)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ifaddr *ifa;
|
|
|
|
ifp = info->xn_ifp;
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family == AF_INET) {
|
|
arp_ifinit(ifp, ifa);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Callback received when the backend's state changes.
|
|
*/
|
|
static void
|
|
netfront_backend_changed(device_t dev, XenbusState newstate)
|
|
{
|
|
struct netfront_info *sc = device_get_softc(dev);
|
|
|
|
DPRINTK("newstate=%d\n", newstate);
|
|
|
|
switch (newstate) {
|
|
case XenbusStateInitialising:
|
|
case XenbusStateInitialised:
|
|
case XenbusStateUnknown:
|
|
case XenbusStateClosed:
|
|
case XenbusStateReconfigured:
|
|
case XenbusStateReconfiguring:
|
|
break;
|
|
case XenbusStateInitWait:
|
|
if (xenbus_get_state(dev) != XenbusStateInitialising)
|
|
break;
|
|
if (network_connect(sc) != 0)
|
|
break;
|
|
xenbus_set_state(dev, XenbusStateConnected);
|
|
break;
|
|
case XenbusStateClosing:
|
|
xenbus_set_state(dev, XenbusStateClosed);
|
|
break;
|
|
case XenbusStateConnected:
|
|
#ifdef INET
|
|
netfront_send_fake_arp(dev, sc);
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
xn_free_rx_ring(struct netfront_info *sc)
|
|
{
|
|
#if 0
|
|
int i;
|
|
|
|
for (i = 0; i < NET_RX_RING_SIZE; i++) {
|
|
if (sc->xn_cdata.rx_mbufs[i] != NULL) {
|
|
m_freem(sc->rx_mbufs[i]);
|
|
sc->rx_mbufs[i] = NULL;
|
|
}
|
|
}
|
|
|
|
sc->rx.rsp_cons = 0;
|
|
sc->xn_rx_if->req_prod = 0;
|
|
sc->xn_rx_if->event = sc->rx.rsp_cons ;
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
xn_free_tx_ring(struct netfront_info *sc)
|
|
{
|
|
#if 0
|
|
int i;
|
|
|
|
for (i = 0; i < NET_TX_RING_SIZE; i++) {
|
|
if (sc->tx_mbufs[i] != NULL) {
|
|
m_freem(sc->tx_mbufs[i]);
|
|
sc->xn_cdata.xn_tx_chain[i] = NULL;
|
|
}
|
|
}
|
|
|
|
return;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* \brief Verify that there is sufficient space in the Tx ring
|
|
* buffer for a maximally sized request to be enqueued.
|
|
*
|
|
* A transmit request requires a transmit descriptor for each packet
|
|
* fragment, plus up to 2 entries for "options" (e.g. TSO).
|
|
*/
|
|
static inline int
|
|
xn_tx_slot_available(struct netfront_info *np)
|
|
{
|
|
return (RING_FREE_REQUESTS(&np->tx) > (MAX_TX_REQ_FRAGS + 2));
|
|
}
|
|
|
|
static void
|
|
netif_release_tx_bufs(struct netfront_info *np)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i <= NET_TX_RING_SIZE; i++) {
|
|
struct mbuf *m;
|
|
|
|
m = np->tx_mbufs[i];
|
|
|
|
/*
|
|
* We assume that no kernel addresses are
|
|
* less than NET_TX_RING_SIZE. Any entry
|
|
* in the table that is below this number
|
|
* must be an index from free-list tracking.
|
|
*/
|
|
if (((uintptr_t)m) <= NET_TX_RING_SIZE)
|
|
continue;
|
|
gnttab_end_foreign_access_ref(np->grant_tx_ref[i]);
|
|
gnttab_release_grant_reference(&np->gref_tx_head,
|
|
np->grant_tx_ref[i]);
|
|
np->grant_tx_ref[i] = GRANT_REF_INVALID;
|
|
add_id_to_freelist(np->tx_mbufs, i);
|
|
np->xn_cdata.xn_tx_chain_cnt--;
|
|
if (np->xn_cdata.xn_tx_chain_cnt < 0) {
|
|
panic("%s: tx_chain_cnt must be >= 0", __func__);
|
|
}
|
|
m_free(m);
|
|
}
|
|
}
|
|
|
|
static void
|
|
network_alloc_rx_buffers(struct netfront_info *sc)
|
|
{
|
|
int otherend_id = xenbus_get_otherend_id(sc->xbdev);
|
|
unsigned short id;
|
|
struct mbuf *m_new;
|
|
int i, batch_target, notify;
|
|
RING_IDX req_prod;
|
|
struct xen_memory_reservation reservation;
|
|
grant_ref_t ref;
|
|
int nr_flips;
|
|
netif_rx_request_t *req;
|
|
vm_offset_t vaddr;
|
|
u_long pfn;
|
|
|
|
req_prod = sc->rx.req_prod_pvt;
|
|
|
|
if (__predict_false(sc->carrier == 0))
|
|
return;
|
|
|
|
/*
|
|
* Allocate mbufs greedily, even though we batch updates to the
|
|
* receive ring. This creates a less bursty demand on the memory
|
|
* allocator, and so should reduce the chance of failed allocation
|
|
* requests both for ourself and for other kernel subsystems.
|
|
*
|
|
* Here we attempt to maintain rx_target buffers in flight, counting
|
|
* buffers that we have yet to process in the receive ring.
|
|
*/
|
|
batch_target = sc->rx_target - (req_prod - sc->rx.rsp_cons);
|
|
for (i = mbufq_len(&sc->xn_rx_batch); i < batch_target; i++) {
|
|
m_new = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
|
|
if (m_new == NULL) {
|
|
if (i != 0)
|
|
goto refill;
|
|
/*
|
|
* XXX set timer
|
|
*/
|
|
break;
|
|
}
|
|
m_new->m_len = m_new->m_pkthdr.len = MJUMPAGESIZE;
|
|
|
|
/* queue the mbufs allocated */
|
|
(void )mbufq_enqueue(&sc->xn_rx_batch, m_new);
|
|
}
|
|
|
|
/*
|
|
* If we've allocated at least half of our target number of entries,
|
|
* submit them to the backend - we have enough to make the overhead
|
|
* of submission worthwhile. Otherwise wait for more mbufs and
|
|
* request entries to become available.
|
|
*/
|
|
if (i < (sc->rx_target/2)) {
|
|
if (req_prod >sc->rx.sring->req_prod)
|
|
goto push;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Double floating fill target if we risked having the backend
|
|
* run out of empty buffers for receive traffic. We define "running
|
|
* low" as having less than a fourth of our target buffers free
|
|
* at the time we refilled the queue.
|
|
*/
|
|
if ((req_prod - sc->rx.sring->rsp_prod) < (sc->rx_target / 4)) {
|
|
sc->rx_target *= 2;
|
|
if (sc->rx_target > sc->rx_max_target)
|
|
sc->rx_target = sc->rx_max_target;
|
|
}
|
|
|
|
refill:
|
|
for (nr_flips = i = 0; ; i++) {
|
|
if ((m_new = mbufq_dequeue(&sc->xn_rx_batch)) == NULL)
|
|
break;
|
|
|
|
m_new->m_ext.ext_arg1 = (vm_paddr_t *)(uintptr_t)(
|
|
vtophys(m_new->m_ext.ext_buf) >> PAGE_SHIFT);
|
|
|
|
id = xennet_rxidx(req_prod + i);
|
|
|
|
KASSERT(sc->rx_mbufs[id] == NULL, ("non-NULL xm_rx_chain"));
|
|
sc->rx_mbufs[id] = m_new;
|
|
|
|
ref = gnttab_claim_grant_reference(&sc->gref_rx_head);
|
|
KASSERT(ref != GNTTAB_LIST_END,
|
|
("reserved grant references exhuasted"));
|
|
sc->grant_rx_ref[id] = ref;
|
|
|
|
vaddr = mtod(m_new, vm_offset_t);
|
|
pfn = vtophys(vaddr) >> PAGE_SHIFT;
|
|
req = RING_GET_REQUEST(&sc->rx, req_prod + i);
|
|
|
|
if (sc->copying_receiver == 0) {
|
|
gnttab_grant_foreign_transfer_ref(ref,
|
|
otherend_id, pfn);
|
|
sc->rx_pfn_array[nr_flips] = pfn;
|
|
nr_flips++;
|
|
} else {
|
|
gnttab_grant_foreign_access_ref(ref,
|
|
otherend_id,
|
|
pfn, 0);
|
|
}
|
|
req->id = id;
|
|
req->gref = ref;
|
|
|
|
sc->rx_pfn_array[i] =
|
|
vtophys(mtod(m_new,vm_offset_t)) >> PAGE_SHIFT;
|
|
}
|
|
|
|
KASSERT(i, ("no mbufs processed")); /* should have returned earlier */
|
|
KASSERT(mbufq_len(&sc->xn_rx_batch) == 0, ("not all mbufs processed"));
|
|
/*
|
|
* We may have allocated buffers which have entries outstanding
|
|
* in the page * update queue -- make sure we flush those first!
|
|
*/
|
|
if (nr_flips != 0) {
|
|
#ifdef notyet
|
|
/* Tell the ballon driver what is going on. */
|
|
balloon_update_driver_allowance(i);
|
|
#endif
|
|
set_xen_guest_handle(reservation.extent_start, sc->rx_pfn_array);
|
|
reservation.nr_extents = i;
|
|
reservation.extent_order = 0;
|
|
reservation.address_bits = 0;
|
|
reservation.domid = DOMID_SELF;
|
|
} else {
|
|
wmb();
|
|
}
|
|
|
|
/* Above is a suitable barrier to ensure backend will see requests. */
|
|
sc->rx.req_prod_pvt = req_prod + i;
|
|
push:
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->rx, notify);
|
|
if (notify)
|
|
xen_intr_signal(sc->xen_intr_handle);
|
|
}
|
|
|
|
static void
|
|
xn_rxeof(struct netfront_info *np)
|
|
{
|
|
struct ifnet *ifp;
|
|
#if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
|
|
struct lro_ctrl *lro = &np->xn_lro;
|
|
struct lro_entry *queued;
|
|
#endif
|
|
struct netfront_rx_info rinfo;
|
|
struct netif_rx_response *rx = &rinfo.rx;
|
|
struct netif_extra_info *extras = rinfo.extras;
|
|
RING_IDX i, rp;
|
|
struct mbuf *m;
|
|
struct mbufq rxq, errq;
|
|
int err, pages_flipped = 0, work_to_do;
|
|
|
|
do {
|
|
XN_RX_LOCK_ASSERT(np);
|
|
if (!netfront_carrier_ok(np))
|
|
return;
|
|
|
|
/* XXX: there should be some sane limit. */
|
|
mbufq_init(&errq, INT_MAX);
|
|
mbufq_init(&rxq, INT_MAX);
|
|
|
|
ifp = np->xn_ifp;
|
|
|
|
rp = np->rx.sring->rsp_prod;
|
|
rmb(); /* Ensure we see queued responses up to 'rp'. */
|
|
|
|
i = np->rx.rsp_cons;
|
|
while ((i != rp)) {
|
|
memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx));
|
|
memset(extras, 0, sizeof(rinfo.extras));
|
|
|
|
m = NULL;
|
|
err = xennet_get_responses(np, &rinfo, rp, &i, &m,
|
|
&pages_flipped);
|
|
|
|
if (__predict_false(err)) {
|
|
if (m)
|
|
(void )mbufq_enqueue(&errq, m);
|
|
np->stats.rx_errors++;
|
|
continue;
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
if ( rx->flags & NETRXF_data_validated ) {
|
|
/* Tell the stack the checksums are okay */
|
|
/*
|
|
* XXX this isn't necessarily the case - need to add
|
|
* check
|
|
*/
|
|
|
|
m->m_pkthdr.csum_flags |=
|
|
(CSUM_IP_CHECKED | CSUM_IP_VALID | CSUM_DATA_VALID
|
|
| CSUM_PSEUDO_HDR);
|
|
m->m_pkthdr.csum_data = 0xffff;
|
|
}
|
|
|
|
np->stats.rx_packets++;
|
|
np->stats.rx_bytes += m->m_pkthdr.len;
|
|
|
|
(void )mbufq_enqueue(&rxq, m);
|
|
np->rx.rsp_cons = i;
|
|
}
|
|
|
|
if (pages_flipped) {
|
|
/* Some pages are no longer absent... */
|
|
#ifdef notyet
|
|
balloon_update_driver_allowance(-pages_flipped);
|
|
#endif
|
|
}
|
|
|
|
mbufq_drain(&errq);
|
|
|
|
/*
|
|
* Process all the mbufs after the remapping is complete.
|
|
* Break the mbuf chain first though.
|
|
*/
|
|
while ((m = mbufq_dequeue(&rxq)) != NULL) {
|
|
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
|
|
|
|
/*
|
|
* Do we really need to drop the rx lock?
|
|
*/
|
|
XN_RX_UNLOCK(np);
|
|
#if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
|
|
/* Use LRO if possible */
|
|
if ((ifp->if_capenable & IFCAP_LRO) == 0 ||
|
|
lro->lro_cnt == 0 || tcp_lro_rx(lro, m, 0)) {
|
|
/*
|
|
* If LRO fails, pass up to the stack
|
|
* directly.
|
|
*/
|
|
(*ifp->if_input)(ifp, m);
|
|
}
|
|
#else
|
|
(*ifp->if_input)(ifp, m);
|
|
#endif
|
|
XN_RX_LOCK(np);
|
|
}
|
|
|
|
np->rx.rsp_cons = i;
|
|
|
|
#if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
|
|
/*
|
|
* Flush any outstanding LRO work
|
|
*/
|
|
while (!SLIST_EMPTY(&lro->lro_active)) {
|
|
queued = SLIST_FIRST(&lro->lro_active);
|
|
SLIST_REMOVE_HEAD(&lro->lro_active, next);
|
|
tcp_lro_flush(lro, queued);
|
|
}
|
|
#endif
|
|
|
|
#if 0
|
|
/* If we get a callback with very few responses, reduce fill target. */
|
|
/* NB. Note exponential increase, linear decrease. */
|
|
if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) >
|
|
((3*np->rx_target) / 4)) && (--np->rx_target < np->rx_min_target))
|
|
np->rx_target = np->rx_min_target;
|
|
#endif
|
|
|
|
network_alloc_rx_buffers(np);
|
|
|
|
RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, work_to_do);
|
|
} while (work_to_do);
|
|
}
|
|
|
|
static void
|
|
xn_txeof(struct netfront_info *np)
|
|
{
|
|
RING_IDX i, prod;
|
|
unsigned short id;
|
|
struct ifnet *ifp;
|
|
netif_tx_response_t *txr;
|
|
struct mbuf *m;
|
|
|
|
XN_TX_LOCK_ASSERT(np);
|
|
|
|
if (!netfront_carrier_ok(np))
|
|
return;
|
|
|
|
ifp = np->xn_ifp;
|
|
|
|
do {
|
|
prod = np->tx.sring->rsp_prod;
|
|
rmb(); /* Ensure we see responses up to 'rp'. */
|
|
|
|
for (i = np->tx.rsp_cons; i != prod; i++) {
|
|
txr = RING_GET_RESPONSE(&np->tx, i);
|
|
if (txr->status == NETIF_RSP_NULL)
|
|
continue;
|
|
|
|
if (txr->status != NETIF_RSP_OKAY) {
|
|
printf("%s: WARNING: response is %d!\n",
|
|
__func__, txr->status);
|
|
}
|
|
id = txr->id;
|
|
m = np->tx_mbufs[id];
|
|
KASSERT(m != NULL, ("mbuf not found in xn_tx_chain"));
|
|
KASSERT((uintptr_t)m > NET_TX_RING_SIZE,
|
|
("mbuf already on the free list, but we're "
|
|
"trying to free it again!"));
|
|
M_ASSERTVALID(m);
|
|
|
|
/*
|
|
* Increment packet count if this is the last
|
|
* mbuf of the chain.
|
|
*/
|
|
if (!m->m_next)
|
|
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
|
|
if (__predict_false(gnttab_query_foreign_access(
|
|
np->grant_tx_ref[id]) != 0)) {
|
|
panic("%s: grant id %u still in use by the "
|
|
"backend", __func__, id);
|
|
}
|
|
gnttab_end_foreign_access_ref(
|
|
np->grant_tx_ref[id]);
|
|
gnttab_release_grant_reference(
|
|
&np->gref_tx_head, np->grant_tx_ref[id]);
|
|
np->grant_tx_ref[id] = GRANT_REF_INVALID;
|
|
|
|
np->tx_mbufs[id] = NULL;
|
|
add_id_to_freelist(np->tx_mbufs, id);
|
|
np->xn_cdata.xn_tx_chain_cnt--;
|
|
m_free(m);
|
|
/* Only mark the queue active if we've freed up at least one slot to try */
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
}
|
|
np->tx.rsp_cons = prod;
|
|
|
|
/*
|
|
* Set a new event, then check for race with update of
|
|
* tx_cons. Note that it is essential to schedule a
|
|
* callback, no matter how few buffers are pending. Even if
|
|
* there is space in the transmit ring, higher layers may
|
|
* be blocked because too much data is outstanding: in such
|
|
* cases notification from Xen is likely to be the only kick
|
|
* that we'll get.
|
|
*/
|
|
np->tx.sring->rsp_event =
|
|
prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
|
|
|
|
mb();
|
|
} while (prod != np->tx.sring->rsp_prod);
|
|
|
|
if (np->tx_full &&
|
|
((np->tx.sring->req_prod - prod) < NET_TX_RING_SIZE)) {
|
|
np->tx_full = 0;
|
|
#if 0
|
|
if (np->user_state == UST_OPEN)
|
|
netif_wake_queue(dev);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static void
|
|
xn_intr(void *xsc)
|
|
{
|
|
struct netfront_info *np = xsc;
|
|
struct ifnet *ifp = np->xn_ifp;
|
|
|
|
#if 0
|
|
if (!(np->rx.rsp_cons != np->rx.sring->rsp_prod &&
|
|
likely(netfront_carrier_ok(np)) &&
|
|
ifp->if_drv_flags & IFF_DRV_RUNNING))
|
|
return;
|
|
#endif
|
|
if (RING_HAS_UNCONSUMED_RESPONSES(&np->tx)) {
|
|
XN_TX_LOCK(np);
|
|
xn_txeof(np);
|
|
XN_TX_UNLOCK(np);
|
|
}
|
|
|
|
XN_RX_LOCK(np);
|
|
xn_rxeof(np);
|
|
XN_RX_UNLOCK(np);
|
|
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
|
|
!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
|
|
xn_start(ifp);
|
|
}
|
|
|
|
static void
|
|
xennet_move_rx_slot(struct netfront_info *np, struct mbuf *m,
|
|
grant_ref_t ref)
|
|
{
|
|
int new = xennet_rxidx(np->rx.req_prod_pvt);
|
|
|
|
KASSERT(np->rx_mbufs[new] == NULL, ("rx_mbufs != NULL"));
|
|
np->rx_mbufs[new] = m;
|
|
np->grant_rx_ref[new] = ref;
|
|
RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new;
|
|
RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref;
|
|
np->rx.req_prod_pvt++;
|
|
}
|
|
|
|
static int
|
|
xennet_get_extras(struct netfront_info *np,
|
|
struct netif_extra_info *extras, RING_IDX rp, RING_IDX *cons)
|
|
{
|
|
struct netif_extra_info *extra;
|
|
|
|
int err = 0;
|
|
|
|
do {
|
|
struct mbuf *m;
|
|
grant_ref_t ref;
|
|
|
|
if (__predict_false(*cons + 1 == rp)) {
|
|
#if 0
|
|
if (net_ratelimit())
|
|
WPRINTK("Missing extra info\n");
|
|
#endif
|
|
err = EINVAL;
|
|
break;
|
|
}
|
|
|
|
extra = (struct netif_extra_info *)
|
|
RING_GET_RESPONSE(&np->rx, ++(*cons));
|
|
|
|
if (__predict_false(!extra->type ||
|
|
extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
|
|
#if 0
|
|
if (net_ratelimit())
|
|
WPRINTK("Invalid extra type: %d\n",
|
|
extra->type);
|
|
#endif
|
|
err = EINVAL;
|
|
} else {
|
|
memcpy(&extras[extra->type - 1], extra, sizeof(*extra));
|
|
}
|
|
|
|
m = xennet_get_rx_mbuf(np, *cons);
|
|
ref = xennet_get_rx_ref(np, *cons);
|
|
xennet_move_rx_slot(np, m, ref);
|
|
} while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
xennet_get_responses(struct netfront_info *np,
|
|
struct netfront_rx_info *rinfo, RING_IDX rp, RING_IDX *cons,
|
|
struct mbuf **list,
|
|
int *pages_flipped_p)
|
|
{
|
|
int pages_flipped = *pages_flipped_p;
|
|
struct netif_rx_response *rx = &rinfo->rx;
|
|
struct netif_extra_info *extras = rinfo->extras;
|
|
struct mbuf *m, *m0, *m_prev;
|
|
grant_ref_t ref = xennet_get_rx_ref(np, *cons);
|
|
RING_IDX ref_cons = *cons;
|
|
int frags = 1;
|
|
int err = 0;
|
|
u_long ret;
|
|
|
|
m0 = m = m_prev = xennet_get_rx_mbuf(np, *cons);
|
|
|
|
if (rx->flags & NETRXF_extra_info) {
|
|
err = xennet_get_extras(np, extras, rp, cons);
|
|
}
|
|
|
|
if (m0 != NULL) {
|
|
m0->m_pkthdr.len = 0;
|
|
m0->m_next = NULL;
|
|
}
|
|
|
|
for (;;) {
|
|
u_long mfn;
|
|
|
|
#if 0
|
|
DPRINTK("rx->status=%hd rx->offset=%hu frags=%u\n",
|
|
rx->status, rx->offset, frags);
|
|
#endif
|
|
if (__predict_false(rx->status < 0 ||
|
|
rx->offset + rx->status > PAGE_SIZE)) {
|
|
|
|
#if 0
|
|
if (net_ratelimit())
|
|
WPRINTK("rx->offset: %x, size: %u\n",
|
|
rx->offset, rx->status);
|
|
#endif
|
|
xennet_move_rx_slot(np, m, ref);
|
|
if (m0 == m)
|
|
m0 = NULL;
|
|
m = NULL;
|
|
err = EINVAL;
|
|
goto next_skip_queue;
|
|
}
|
|
|
|
/*
|
|
* This definitely indicates a bug, either in this driver or in
|
|
* the backend driver. In future this should flag the bad
|
|
* situation to the system controller to reboot the backed.
|
|
*/
|
|
if (ref == GRANT_REF_INVALID) {
|
|
|
|
#if 0
|
|
if (net_ratelimit())
|
|
WPRINTK("Bad rx response id %d.\n", rx->id);
|
|
#endif
|
|
printf("%s: Bad rx response id %d.\n", __func__,rx->id);
|
|
err = EINVAL;
|
|
goto next;
|
|
}
|
|
|
|
if (!np->copying_receiver) {
|
|
/* Memory pressure, insufficient buffer
|
|
* headroom, ...
|
|
*/
|
|
if (!(mfn = gnttab_end_foreign_transfer_ref(ref))) {
|
|
WPRINTK("Unfulfilled rx req (id=%d, st=%d).\n",
|
|
rx->id, rx->status);
|
|
xennet_move_rx_slot(np, m, ref);
|
|
err = ENOMEM;
|
|
goto next;
|
|
}
|
|
|
|
pages_flipped++;
|
|
} else {
|
|
ret = gnttab_end_foreign_access_ref(ref);
|
|
KASSERT(ret, ("ret != 0"));
|
|
}
|
|
|
|
gnttab_release_grant_reference(&np->gref_rx_head, ref);
|
|
|
|
next:
|
|
if (m == NULL)
|
|
break;
|
|
|
|
m->m_len = rx->status;
|
|
m->m_data += rx->offset;
|
|
m0->m_pkthdr.len += rx->status;
|
|
|
|
next_skip_queue:
|
|
if (!(rx->flags & NETRXF_more_data))
|
|
break;
|
|
|
|
if (*cons + frags == rp) {
|
|
if (net_ratelimit())
|
|
WPRINTK("Need more frags\n");
|
|
err = ENOENT;
|
|
printf("%s: cons %u frags %u rp %u, not enough frags\n",
|
|
__func__, *cons, frags, rp);
|
|
break;
|
|
}
|
|
/*
|
|
* Note that m can be NULL, if rx->status < 0 or if
|
|
* rx->offset + rx->status > PAGE_SIZE above.
|
|
*/
|
|
m_prev = m;
|
|
|
|
rx = RING_GET_RESPONSE(&np->rx, *cons + frags);
|
|
m = xennet_get_rx_mbuf(np, *cons + frags);
|
|
|
|
/*
|
|
* m_prev == NULL can happen if rx->status < 0 or if
|
|
* rx->offset + * rx->status > PAGE_SIZE above.
|
|
*/
|
|
if (m_prev != NULL)
|
|
m_prev->m_next = m;
|
|
|
|
/*
|
|
* m0 can be NULL if rx->status < 0 or if * rx->offset +
|
|
* rx->status > PAGE_SIZE above.
|
|
*/
|
|
if (m0 == NULL)
|
|
m0 = m;
|
|
m->m_next = NULL;
|
|
ref = xennet_get_rx_ref(np, *cons + frags);
|
|
ref_cons = *cons + frags;
|
|
frags++;
|
|
}
|
|
*list = m0;
|
|
*cons += frags;
|
|
*pages_flipped_p = pages_flipped;
|
|
|
|
return (err);
|
|
}
|
|
|
|
static void
|
|
xn_tick_locked(struct netfront_info *sc)
|
|
{
|
|
XN_RX_LOCK_ASSERT(sc);
|
|
callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc);
|
|
|
|
/* XXX placeholder for printing debug information */
|
|
}
|
|
|
|
static void
|
|
xn_tick(void *xsc)
|
|
{
|
|
struct netfront_info *sc;
|
|
|
|
sc = xsc;
|
|
XN_RX_LOCK(sc);
|
|
xn_tick_locked(sc);
|
|
XN_RX_UNLOCK(sc);
|
|
}
|
|
|
|
/**
|
|
* \brief Count the number of fragments in an mbuf chain.
|
|
*
|
|
* Surprisingly, there isn't an M* macro for this.
|
|
*/
|
|
static inline int
|
|
xn_count_frags(struct mbuf *m)
|
|
{
|
|
int nfrags;
|
|
|
|
for (nfrags = 0; m != NULL; m = m->m_next)
|
|
nfrags++;
|
|
|
|
return (nfrags);
|
|
}
|
|
|
|
/**
|
|
* Given an mbuf chain, make sure we have enough room and then push
|
|
* it onto the transmit ring.
|
|
*/
|
|
static int
|
|
xn_assemble_tx_request(struct netfront_info *sc, struct mbuf *m_head)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct mbuf *m;
|
|
u_int nfrags;
|
|
int otherend_id;
|
|
|
|
ifp = sc->xn_ifp;
|
|
|
|
/**
|
|
* Defragment the mbuf if necessary.
|
|
*/
|
|
nfrags = xn_count_frags(m_head);
|
|
|
|
/*
|
|
* Check to see whether this request is longer than netback
|
|
* can handle, and try to defrag it.
|
|
*/
|
|
/**
|
|
* It is a bit lame, but the netback driver in Linux can't
|
|
* deal with nfrags > MAX_TX_REQ_FRAGS, which is a quirk of
|
|
* the Linux network stack.
|
|
*/
|
|
if (nfrags > sc->maxfrags) {
|
|
m = m_defrag(m_head, M_NOWAIT);
|
|
if (!m) {
|
|
/*
|
|
* Defrag failed, so free the mbuf and
|
|
* therefore drop the packet.
|
|
*/
|
|
m_freem(m_head);
|
|
return (EMSGSIZE);
|
|
}
|
|
m_head = m;
|
|
}
|
|
|
|
/* Determine how many fragments now exist */
|
|
nfrags = xn_count_frags(m_head);
|
|
|
|
/*
|
|
* Check to see whether the defragmented packet has too many
|
|
* segments for the Linux netback driver.
|
|
*/
|
|
/**
|
|
* The FreeBSD TCP stack, with TSO enabled, can produce a chain
|
|
* of mbufs longer than Linux can handle. Make sure we don't
|
|
* pass a too-long chain over to the other side by dropping the
|
|
* packet. It doesn't look like there is currently a way to
|
|
* tell the TCP stack to generate a shorter chain of packets.
|
|
*/
|
|
if (nfrags > MAX_TX_REQ_FRAGS) {
|
|
#ifdef DEBUG
|
|
printf("%s: nfrags %d > MAX_TX_REQ_FRAGS %d, netback "
|
|
"won't be able to handle it, dropping\n",
|
|
__func__, nfrags, MAX_TX_REQ_FRAGS);
|
|
#endif
|
|
m_freem(m_head);
|
|
return (EMSGSIZE);
|
|
}
|
|
|
|
/*
|
|
* This check should be redundant. We've already verified that we
|
|
* have enough slots in the ring to handle a packet of maximum
|
|
* size, and that our packet is less than the maximum size. Keep
|
|
* it in here as an assert for now just to make certain that
|
|
* xn_tx_chain_cnt is accurate.
|
|
*/
|
|
KASSERT((sc->xn_cdata.xn_tx_chain_cnt + nfrags) <= NET_TX_RING_SIZE,
|
|
("%s: xn_tx_chain_cnt (%d) + nfrags (%d) > NET_TX_RING_SIZE "
|
|
"(%d)!", __func__, (int) sc->xn_cdata.xn_tx_chain_cnt,
|
|
(int) nfrags, (int) NET_TX_RING_SIZE));
|
|
|
|
/*
|
|
* Start packing the mbufs in this chain into
|
|
* the fragment pointers. Stop when we run out
|
|
* of fragments or hit the end of the mbuf chain.
|
|
*/
|
|
m = m_head;
|
|
otherend_id = xenbus_get_otherend_id(sc->xbdev);
|
|
for (m = m_head; m; m = m->m_next) {
|
|
netif_tx_request_t *tx;
|
|
uintptr_t id;
|
|
grant_ref_t ref;
|
|
u_long mfn; /* XXX Wrong type? */
|
|
|
|
tx = RING_GET_REQUEST(&sc->tx, sc->tx.req_prod_pvt);
|
|
id = get_id_from_freelist(sc->tx_mbufs);
|
|
if (id == 0)
|
|
panic("%s: was allocated the freelist head!\n",
|
|
__func__);
|
|
sc->xn_cdata.xn_tx_chain_cnt++;
|
|
if (sc->xn_cdata.xn_tx_chain_cnt > NET_TX_RING_SIZE)
|
|
panic("%s: tx_chain_cnt must be <= NET_TX_RING_SIZE\n",
|
|
__func__);
|
|
sc->tx_mbufs[id] = m;
|
|
tx->id = id;
|
|
ref = gnttab_claim_grant_reference(&sc->gref_tx_head);
|
|
KASSERT((short)ref >= 0, ("Negative ref"));
|
|
mfn = virt_to_mfn(mtod(m, vm_offset_t));
|
|
gnttab_grant_foreign_access_ref(ref, otherend_id,
|
|
mfn, GNTMAP_readonly);
|
|
tx->gref = sc->grant_tx_ref[id] = ref;
|
|
tx->offset = mtod(m, vm_offset_t) & (PAGE_SIZE - 1);
|
|
tx->flags = 0;
|
|
if (m == m_head) {
|
|
/*
|
|
* The first fragment has the entire packet
|
|
* size, subsequent fragments have just the
|
|
* fragment size. The backend works out the
|
|
* true size of the first fragment by
|
|
* subtracting the sizes of the other
|
|
* fragments.
|
|
*/
|
|
tx->size = m->m_pkthdr.len;
|
|
|
|
/*
|
|
* The first fragment contains the checksum flags
|
|
* and is optionally followed by extra data for
|
|
* TSO etc.
|
|
*/
|
|
/**
|
|
* CSUM_TSO requires checksum offloading.
|
|
* Some versions of FreeBSD fail to
|
|
* set CSUM_TCP in the CSUM_TSO case,
|
|
* so we have to test for CSUM_TSO
|
|
* explicitly.
|
|
*/
|
|
if (m->m_pkthdr.csum_flags
|
|
& (CSUM_DELAY_DATA | CSUM_TSO)) {
|
|
tx->flags |= (NETTXF_csum_blank
|
|
| NETTXF_data_validated);
|
|
}
|
|
#if __FreeBSD_version >= 700000
|
|
if (m->m_pkthdr.csum_flags & CSUM_TSO) {
|
|
struct netif_extra_info *gso =
|
|
(struct netif_extra_info *)
|
|
RING_GET_REQUEST(&sc->tx,
|
|
++sc->tx.req_prod_pvt);
|
|
|
|
tx->flags |= NETTXF_extra_info;
|
|
|
|
gso->u.gso.size = m->m_pkthdr.tso_segsz;
|
|
gso->u.gso.type =
|
|
XEN_NETIF_GSO_TYPE_TCPV4;
|
|
gso->u.gso.pad = 0;
|
|
gso->u.gso.features = 0;
|
|
|
|
gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
|
|
gso->flags = 0;
|
|
}
|
|
#endif
|
|
} else {
|
|
tx->size = m->m_len;
|
|
}
|
|
if (m->m_next)
|
|
tx->flags |= NETTXF_more_data;
|
|
|
|
sc->tx.req_prod_pvt++;
|
|
}
|
|
BPF_MTAP(ifp, m_head);
|
|
|
|
sc->stats.tx_bytes += m_head->m_pkthdr.len;
|
|
sc->stats.tx_packets++;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
xn_start_locked(struct ifnet *ifp)
|
|
{
|
|
struct netfront_info *sc;
|
|
struct mbuf *m_head;
|
|
int notify;
|
|
|
|
sc = ifp->if_softc;
|
|
|
|
if (!netfront_carrier_ok(sc))
|
|
return;
|
|
|
|
/*
|
|
* While we have enough transmit slots available for at least one
|
|
* maximum-sized packet, pull mbufs off the queue and put them on
|
|
* the transmit ring.
|
|
*/
|
|
while (xn_tx_slot_available(sc)) {
|
|
IF_DEQUEUE(&ifp->if_snd, m_head);
|
|
if (m_head == NULL)
|
|
break;
|
|
|
|
if (xn_assemble_tx_request(sc, m_head) != 0)
|
|
break;
|
|
}
|
|
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->tx, notify);
|
|
if (notify)
|
|
xen_intr_signal(sc->xen_intr_handle);
|
|
|
|
if (RING_FULL(&sc->tx)) {
|
|
sc->tx_full = 1;
|
|
#if 0
|
|
netif_stop_queue(dev);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static void
|
|
xn_start(struct ifnet *ifp)
|
|
{
|
|
struct netfront_info *sc;
|
|
sc = ifp->if_softc;
|
|
XN_TX_LOCK(sc);
|
|
xn_start_locked(ifp);
|
|
XN_TX_UNLOCK(sc);
|
|
}
|
|
|
|
/* equivalent of network_open() in Linux */
|
|
static void
|
|
xn_ifinit_locked(struct netfront_info *sc)
|
|
{
|
|
struct ifnet *ifp;
|
|
|
|
XN_LOCK_ASSERT(sc);
|
|
|
|
ifp = sc->xn_ifp;
|
|
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
|
|
return;
|
|
|
|
xn_stop(sc);
|
|
|
|
network_alloc_rx_buffers(sc);
|
|
sc->rx.sring->rsp_event = sc->rx.rsp_cons + 1;
|
|
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
|
|
if_link_state_change(ifp, LINK_STATE_UP);
|
|
|
|
callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc);
|
|
}
|
|
|
|
static void
|
|
xn_ifinit(void *xsc)
|
|
{
|
|
struct netfront_info *sc = xsc;
|
|
|
|
XN_LOCK(sc);
|
|
xn_ifinit_locked(sc);
|
|
XN_UNLOCK(sc);
|
|
}
|
|
|
|
static int
|
|
xn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct netfront_info *sc = ifp->if_softc;
|
|
struct ifreq *ifr = (struct ifreq *) data;
|
|
#ifdef INET
|
|
struct ifaddr *ifa = (struct ifaddr *)data;
|
|
#endif
|
|
|
|
int mask, error = 0;
|
|
switch(cmd) {
|
|
case SIOCSIFADDR:
|
|
#ifdef INET
|
|
XN_LOCK(sc);
|
|
if (ifa->ifa_addr->sa_family == AF_INET) {
|
|
ifp->if_flags |= IFF_UP;
|
|
if (!(ifp->if_drv_flags & IFF_DRV_RUNNING))
|
|
xn_ifinit_locked(sc);
|
|
arp_ifinit(ifp, ifa);
|
|
XN_UNLOCK(sc);
|
|
} else {
|
|
XN_UNLOCK(sc);
|
|
#endif
|
|
error = ether_ioctl(ifp, cmd, data);
|
|
#ifdef INET
|
|
}
|
|
#endif
|
|
break;
|
|
case SIOCSIFMTU:
|
|
/* XXX can we alter the MTU on a VN ?*/
|
|
#ifdef notyet
|
|
if (ifr->ifr_mtu > XN_JUMBO_MTU)
|
|
error = EINVAL;
|
|
else
|
|
#endif
|
|
{
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
xn_ifinit(sc);
|
|
}
|
|
break;
|
|
case SIOCSIFFLAGS:
|
|
XN_LOCK(sc);
|
|
if (ifp->if_flags & IFF_UP) {
|
|
/*
|
|
* If only the state of the PROMISC flag changed,
|
|
* then just use the 'set promisc mode' command
|
|
* instead of reinitializing the entire NIC. Doing
|
|
* a full re-init means reloading the firmware and
|
|
* waiting for it to start up, which may take a
|
|
* second or two.
|
|
*/
|
|
#ifdef notyet
|
|
/* No promiscuous mode with Xen */
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
|
|
ifp->if_flags & IFF_PROMISC &&
|
|
!(sc->xn_if_flags & IFF_PROMISC)) {
|
|
XN_SETBIT(sc, XN_RX_MODE,
|
|
XN_RXMODE_RX_PROMISC);
|
|
} else if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
|
|
!(ifp->if_flags & IFF_PROMISC) &&
|
|
sc->xn_if_flags & IFF_PROMISC) {
|
|
XN_CLRBIT(sc, XN_RX_MODE,
|
|
XN_RXMODE_RX_PROMISC);
|
|
} else
|
|
#endif
|
|
xn_ifinit_locked(sc);
|
|
} else {
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
|
|
xn_stop(sc);
|
|
}
|
|
}
|
|
sc->xn_if_flags = ifp->if_flags;
|
|
XN_UNLOCK(sc);
|
|
error = 0;
|
|
break;
|
|
case SIOCSIFCAP:
|
|
mask = ifr->ifr_reqcap ^ ifp->if_capenable;
|
|
if (mask & IFCAP_TXCSUM) {
|
|
if (IFCAP_TXCSUM & ifp->if_capenable) {
|
|
ifp->if_capenable &= ~(IFCAP_TXCSUM|IFCAP_TSO4);
|
|
ifp->if_hwassist &= ~(CSUM_TCP | CSUM_UDP
|
|
| CSUM_IP | CSUM_TSO);
|
|
} else {
|
|
ifp->if_capenable |= IFCAP_TXCSUM;
|
|
ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP
|
|
| CSUM_IP);
|
|
}
|
|
}
|
|
if (mask & IFCAP_RXCSUM) {
|
|
ifp->if_capenable ^= IFCAP_RXCSUM;
|
|
}
|
|
#if __FreeBSD_version >= 700000
|
|
if (mask & IFCAP_TSO4) {
|
|
if (IFCAP_TSO4 & ifp->if_capenable) {
|
|
ifp->if_capenable &= ~IFCAP_TSO4;
|
|
ifp->if_hwassist &= ~CSUM_TSO;
|
|
} else if (IFCAP_TXCSUM & ifp->if_capenable) {
|
|
ifp->if_capenable |= IFCAP_TSO4;
|
|
ifp->if_hwassist |= CSUM_TSO;
|
|
} else {
|
|
IPRINTK("Xen requires tx checksum offload"
|
|
" be enabled to use TSO\n");
|
|
error = EINVAL;
|
|
}
|
|
}
|
|
if (mask & IFCAP_LRO) {
|
|
ifp->if_capenable ^= IFCAP_LRO;
|
|
|
|
}
|
|
#endif
|
|
error = 0;
|
|
break;
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
#ifdef notyet
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
|
|
XN_LOCK(sc);
|
|
xn_setmulti(sc);
|
|
XN_UNLOCK(sc);
|
|
error = 0;
|
|
}
|
|
#endif
|
|
/* FALLTHROUGH */
|
|
case SIOCSIFMEDIA:
|
|
case SIOCGIFMEDIA:
|
|
error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
|
|
break;
|
|
default:
|
|
error = ether_ioctl(ifp, cmd, data);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
xn_stop(struct netfront_info *sc)
|
|
{
|
|
struct ifnet *ifp;
|
|
|
|
XN_LOCK_ASSERT(sc);
|
|
|
|
ifp = sc->xn_ifp;
|
|
|
|
callout_stop(&sc->xn_stat_ch);
|
|
|
|
xn_free_rx_ring(sc);
|
|
xn_free_tx_ring(sc);
|
|
|
|
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
|
|
if_link_state_change(ifp, LINK_STATE_DOWN);
|
|
}
|
|
|
|
/* START of Xenolinux helper functions adapted to FreeBSD */
|
|
int
|
|
network_connect(struct netfront_info *np)
|
|
{
|
|
int i, requeue_idx, error;
|
|
grant_ref_t ref;
|
|
netif_rx_request_t *req;
|
|
u_int feature_rx_copy, feature_rx_flip;
|
|
|
|
error = xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
|
|
"feature-rx-copy", NULL, "%u", &feature_rx_copy);
|
|
if (error)
|
|
feature_rx_copy = 0;
|
|
error = xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
|
|
"feature-rx-flip", NULL, "%u", &feature_rx_flip);
|
|
if (error)
|
|
feature_rx_flip = 1;
|
|
|
|
/*
|
|
* Copy packets on receive path if:
|
|
* (a) This was requested by user, and the backend supports it; or
|
|
* (b) Flipping was requested, but this is unsupported by the backend.
|
|
*/
|
|
np->copying_receiver = ((MODPARM_rx_copy && feature_rx_copy) ||
|
|
(MODPARM_rx_flip && !feature_rx_flip));
|
|
|
|
/* Recovery procedure: */
|
|
error = talk_to_backend(np->xbdev, np);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* Step 1: Reinitialise variables. */
|
|
xn_query_features(np);
|
|
xn_configure_features(np);
|
|
netif_release_tx_bufs(np);
|
|
|
|
/* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
|
|
for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
|
|
struct mbuf *m;
|
|
u_long pfn;
|
|
|
|
if (np->rx_mbufs[i] == NULL)
|
|
continue;
|
|
|
|
m = np->rx_mbufs[requeue_idx] = xennet_get_rx_mbuf(np, i);
|
|
ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
|
|
|
|
req = RING_GET_REQUEST(&np->rx, requeue_idx);
|
|
pfn = vtophys(mtod(m, vm_offset_t)) >> PAGE_SHIFT;
|
|
|
|
if (!np->copying_receiver) {
|
|
gnttab_grant_foreign_transfer_ref(ref,
|
|
xenbus_get_otherend_id(np->xbdev),
|
|
pfn);
|
|
} else {
|
|
gnttab_grant_foreign_access_ref(ref,
|
|
xenbus_get_otherend_id(np->xbdev),
|
|
pfn, 0);
|
|
}
|
|
req->gref = ref;
|
|
req->id = requeue_idx;
|
|
|
|
requeue_idx++;
|
|
}
|
|
|
|
np->rx.req_prod_pvt = requeue_idx;
|
|
|
|
/* Step 3: All public and private state should now be sane. Get
|
|
* ready to start sending and receiving packets and give the driver
|
|
* domain a kick because we've probably just requeued some
|
|
* packets.
|
|
*/
|
|
netfront_carrier_on(np);
|
|
xen_intr_signal(np->xen_intr_handle);
|
|
XN_TX_LOCK(np);
|
|
xn_txeof(np);
|
|
XN_TX_UNLOCK(np);
|
|
network_alloc_rx_buffers(np);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
xn_query_features(struct netfront_info *np)
|
|
{
|
|
int val;
|
|
|
|
device_printf(np->xbdev, "backend features:");
|
|
|
|
if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
|
|
"feature-sg", NULL, "%d", &val) < 0)
|
|
val = 0;
|
|
|
|
np->maxfrags = 1;
|
|
if (val) {
|
|
np->maxfrags = MAX_TX_REQ_FRAGS;
|
|
printf(" feature-sg");
|
|
}
|
|
|
|
if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
|
|
"feature-gso-tcpv4", NULL, "%d", &val) < 0)
|
|
val = 0;
|
|
|
|
np->xn_ifp->if_capabilities &= ~(IFCAP_TSO4|IFCAP_LRO);
|
|
if (val) {
|
|
np->xn_ifp->if_capabilities |= IFCAP_TSO4|IFCAP_LRO;
|
|
printf(" feature-gso-tcp4");
|
|
}
|
|
|
|
printf("\n");
|
|
}
|
|
|
|
static int
|
|
xn_configure_features(struct netfront_info *np)
|
|
{
|
|
int err, cap_enabled;
|
|
|
|
err = 0;
|
|
|
|
if (np->xn_resume &&
|
|
((np->xn_ifp->if_capenable & np->xn_ifp->if_capabilities)
|
|
== np->xn_ifp->if_capenable)) {
|
|
/* Current options are available, no need to do anything. */
|
|
return (0);
|
|
}
|
|
|
|
/* Try to preserve as many options as possible. */
|
|
if (np->xn_resume)
|
|
cap_enabled = np->xn_ifp->if_capenable;
|
|
else
|
|
cap_enabled = UINT_MAX;
|
|
|
|
#if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
|
|
if ((np->xn_ifp->if_capenable & IFCAP_LRO) == (cap_enabled & IFCAP_LRO))
|
|
tcp_lro_free(&np->xn_lro);
|
|
#endif
|
|
np->xn_ifp->if_capenable =
|
|
np->xn_ifp->if_capabilities & ~(IFCAP_LRO|IFCAP_TSO4) & cap_enabled;
|
|
np->xn_ifp->if_hwassist &= ~CSUM_TSO;
|
|
#if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
|
|
if (xn_enable_lro && (np->xn_ifp->if_capabilities & IFCAP_LRO) ==
|
|
(cap_enabled & IFCAP_LRO)) {
|
|
err = tcp_lro_init(&np->xn_lro);
|
|
if (err) {
|
|
device_printf(np->xbdev, "LRO initialization failed\n");
|
|
} else {
|
|
np->xn_lro.ifp = np->xn_ifp;
|
|
np->xn_ifp->if_capenable |= IFCAP_LRO;
|
|
}
|
|
}
|
|
if ((np->xn_ifp->if_capabilities & IFCAP_TSO4) ==
|
|
(cap_enabled & IFCAP_TSO4)) {
|
|
np->xn_ifp->if_capenable |= IFCAP_TSO4;
|
|
np->xn_ifp->if_hwassist |= CSUM_TSO;
|
|
}
|
|
#endif
|
|
return (err);
|
|
}
|
|
|
|
/**
|
|
* Create a network device.
|
|
* @param dev Newbus device representing this virtual NIC.
|
|
*/
|
|
int
|
|
create_netdev(device_t dev)
|
|
{
|
|
int i;
|
|
struct netfront_info *np;
|
|
int err;
|
|
struct ifnet *ifp;
|
|
|
|
np = device_get_softc(dev);
|
|
|
|
np->xbdev = dev;
|
|
|
|
XN_LOCK_INIT(np, xennetif);
|
|
|
|
ifmedia_init(&np->sc_media, 0, xn_ifmedia_upd, xn_ifmedia_sts);
|
|
ifmedia_add(&np->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL);
|
|
ifmedia_set(&np->sc_media, IFM_ETHER|IFM_MANUAL);
|
|
|
|
np->rx_target = RX_MIN_TARGET;
|
|
np->rx_min_target = RX_MIN_TARGET;
|
|
np->rx_max_target = RX_MAX_TARGET;
|
|
|
|
/* Initialise {tx,rx}_skbs to be a free chain containing every entry. */
|
|
for (i = 0; i <= NET_TX_RING_SIZE; i++) {
|
|
np->tx_mbufs[i] = (void *) ((u_long) i+1);
|
|
np->grant_tx_ref[i] = GRANT_REF_INVALID;
|
|
}
|
|
np->tx_mbufs[NET_TX_RING_SIZE] = (void *)0;
|
|
|
|
for (i = 0; i <= NET_RX_RING_SIZE; i++) {
|
|
|
|
np->rx_mbufs[i] = NULL;
|
|
np->grant_rx_ref[i] = GRANT_REF_INVALID;
|
|
}
|
|
|
|
mbufq_init(&np->xn_rx_batch, INT_MAX);
|
|
|
|
/* A grant for every tx ring slot */
|
|
if (gnttab_alloc_grant_references(NET_TX_RING_SIZE,
|
|
&np->gref_tx_head) != 0) {
|
|
IPRINTK("#### netfront can't alloc tx grant refs\n");
|
|
err = ENOMEM;
|
|
goto exit;
|
|
}
|
|
/* A grant for every rx ring slot */
|
|
if (gnttab_alloc_grant_references(RX_MAX_TARGET,
|
|
&np->gref_rx_head) != 0) {
|
|
WPRINTK("#### netfront can't alloc rx grant refs\n");
|
|
gnttab_free_grant_references(np->gref_tx_head);
|
|
err = ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
err = xen_net_read_mac(dev, np->mac);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Set up ifnet structure */
|
|
ifp = np->xn_ifp = if_alloc(IFT_ETHER);
|
|
ifp->if_softc = np;
|
|
if_initname(ifp, "xn", device_get_unit(dev));
|
|
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
|
|
ifp->if_ioctl = xn_ioctl;
|
|
ifp->if_output = ether_output;
|
|
ifp->if_start = xn_start;
|
|
#ifdef notyet
|
|
ifp->if_watchdog = xn_watchdog;
|
|
#endif
|
|
ifp->if_init = xn_ifinit;
|
|
ifp->if_snd.ifq_maxlen = NET_TX_RING_SIZE - 1;
|
|
|
|
ifp->if_hwassist = XN_CSUM_FEATURES;
|
|
ifp->if_capabilities = IFCAP_HWCSUM;
|
|
ifp->if_hw_tsomax = 65536 - (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
|
|
ifp->if_hw_tsomaxsegcount = MAX_TX_REQ_FRAGS;
|
|
ifp->if_hw_tsomaxsegsize = PAGE_SIZE;
|
|
|
|
ether_ifattach(ifp, np->mac);
|
|
callout_init(&np->xn_stat_ch, 1);
|
|
netfront_carrier_off(np);
|
|
|
|
return (0);
|
|
|
|
exit:
|
|
gnttab_free_grant_references(np->gref_tx_head);
|
|
out:
|
|
return (err);
|
|
}
|
|
|
|
/**
|
|
* Handle the change of state of the backend to Closing. We must delete our
|
|
* device-layer structures now, to ensure that writes are flushed through to
|
|
* the backend. Once is this done, we can switch to Closed in
|
|
* acknowledgement.
|
|
*/
|
|
#if 0
|
|
static void
|
|
netfront_closing(device_t dev)
|
|
{
|
|
#if 0
|
|
struct netfront_info *info = dev->dev_driver_data;
|
|
|
|
DPRINTK("netfront_closing: %s removed\n", dev->nodename);
|
|
|
|
close_netdev(info);
|
|
#endif
|
|
xenbus_switch_state(dev, XenbusStateClosed);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
netfront_detach(device_t dev)
|
|
{
|
|
struct netfront_info *info = device_get_softc(dev);
|
|
|
|
DPRINTK("%s\n", xenbus_get_node(dev));
|
|
|
|
netif_free(info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
netif_free(struct netfront_info *info)
|
|
{
|
|
XN_LOCK(info);
|
|
xn_stop(info);
|
|
XN_UNLOCK(info);
|
|
callout_drain(&info->xn_stat_ch);
|
|
netif_disconnect_backend(info);
|
|
if (info->xn_ifp != NULL) {
|
|
ether_ifdetach(info->xn_ifp);
|
|
if_free(info->xn_ifp);
|
|
info->xn_ifp = NULL;
|
|
}
|
|
ifmedia_removeall(&info->sc_media);
|
|
}
|
|
|
|
static void
|
|
netif_disconnect_backend(struct netfront_info *info)
|
|
{
|
|
XN_RX_LOCK(info);
|
|
XN_TX_LOCK(info);
|
|
netfront_carrier_off(info);
|
|
XN_TX_UNLOCK(info);
|
|
XN_RX_UNLOCK(info);
|
|
|
|
free_ring(&info->tx_ring_ref, &info->tx.sring);
|
|
free_ring(&info->rx_ring_ref, &info->rx.sring);
|
|
|
|
xen_intr_unbind(&info->xen_intr_handle);
|
|
}
|
|
|
|
static void
|
|
free_ring(int *ref, void *ring_ptr_ref)
|
|
{
|
|
void **ring_ptr_ptr = ring_ptr_ref;
|
|
|
|
if (*ref != GRANT_REF_INVALID) {
|
|
/* This API frees the associated storage. */
|
|
gnttab_end_foreign_access(*ref, *ring_ptr_ptr);
|
|
*ref = GRANT_REF_INVALID;
|
|
}
|
|
*ring_ptr_ptr = NULL;
|
|
}
|
|
|
|
static int
|
|
xn_ifmedia_upd(struct ifnet *ifp)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
xn_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
|
|
{
|
|
ifmr->ifm_status = IFM_AVALID|IFM_ACTIVE;
|
|
ifmr->ifm_active = IFM_ETHER|IFM_MANUAL;
|
|
}
|
|
|
|
/* ** Driver registration ** */
|
|
static device_method_t netfront_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, netfront_probe),
|
|
DEVMETHOD(device_attach, netfront_attach),
|
|
DEVMETHOD(device_detach, netfront_detach),
|
|
DEVMETHOD(device_shutdown, bus_generic_shutdown),
|
|
DEVMETHOD(device_suspend, netfront_suspend),
|
|
DEVMETHOD(device_resume, netfront_resume),
|
|
|
|
/* Xenbus interface */
|
|
DEVMETHOD(xenbus_otherend_changed, netfront_backend_changed),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t netfront_driver = {
|
|
"xn",
|
|
netfront_methods,
|
|
sizeof(struct netfront_info),
|
|
};
|
|
devclass_t netfront_devclass;
|
|
|
|
DRIVER_MODULE(xe, xenbusb_front, netfront_driver, netfront_devclass, NULL,
|
|
NULL);
|