1217 строки
30 KiB
C
1217 строки
30 KiB
C
/*
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* Xenbus code for netif backend
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*
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* Copyright (C) 2005 Rusty Russell <rusty@rustcorp.com.au>
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* Copyright (C) 2005 XenSource Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "common.h"
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#include <linux/vmalloc.h>
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#include <linux/rtnetlink.h>
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struct backend_info {
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struct xenbus_device *dev;
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struct xenvif *vif;
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/* This is the state that will be reflected in xenstore when any
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* active hotplug script completes.
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*/
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enum xenbus_state state;
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enum xenbus_state frontend_state;
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struct xenbus_watch hotplug_status_watch;
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u8 have_hotplug_status_watch:1;
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const char *hotplug_script;
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};
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static int connect_data_rings(struct backend_info *be,
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struct xenvif_queue *queue);
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static void connect(struct backend_info *be);
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static int read_xenbus_vif_flags(struct backend_info *be);
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static int backend_create_xenvif(struct backend_info *be);
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static void unregister_hotplug_status_watch(struct backend_info *be);
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static void xen_unregister_watchers(struct xenvif *vif);
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static void set_backend_state(struct backend_info *be,
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enum xenbus_state state);
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#ifdef CONFIG_DEBUG_FS
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struct dentry *xen_netback_dbg_root = NULL;
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static int xenvif_read_io_ring(struct seq_file *m, void *v)
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{
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struct xenvif_queue *queue = m->private;
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struct xen_netif_tx_back_ring *tx_ring = &queue->tx;
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struct xen_netif_rx_back_ring *rx_ring = &queue->rx;
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struct netdev_queue *dev_queue;
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if (tx_ring->sring) {
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struct xen_netif_tx_sring *sring = tx_ring->sring;
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seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id,
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tx_ring->nr_ents);
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seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n",
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sring->req_prod,
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sring->req_prod - sring->rsp_prod,
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tx_ring->req_cons,
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tx_ring->req_cons - sring->rsp_prod,
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sring->req_event,
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sring->req_event - sring->rsp_prod);
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seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n",
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sring->rsp_prod,
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tx_ring->rsp_prod_pvt,
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tx_ring->rsp_prod_pvt - sring->rsp_prod,
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sring->rsp_event,
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sring->rsp_event - sring->rsp_prod);
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seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n",
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queue->pending_prod,
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queue->pending_cons,
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nr_pending_reqs(queue));
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seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n",
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queue->dealloc_prod,
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queue->dealloc_cons,
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queue->dealloc_prod - queue->dealloc_cons);
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}
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if (rx_ring->sring) {
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struct xen_netif_rx_sring *sring = rx_ring->sring;
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seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents);
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seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n",
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sring->req_prod,
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sring->req_prod - sring->rsp_prod,
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rx_ring->req_cons,
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rx_ring->req_cons - sring->rsp_prod,
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sring->req_event,
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sring->req_event - sring->rsp_prod);
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seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n",
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sring->rsp_prod,
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rx_ring->rsp_prod_pvt,
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rx_ring->rsp_prod_pvt - sring->rsp_prod,
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sring->rsp_event,
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sring->rsp_event - sring->rsp_prod);
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}
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seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n"
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"Credit timer_pending: %d, credit: %lu, usec: %lu\n"
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"remaining: %lu, expires: %lu, now: %lu\n",
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queue->napi.state, queue->napi.weight,
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skb_queue_len(&queue->tx_queue),
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timer_pending(&queue->credit_timeout),
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queue->credit_bytes,
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queue->credit_usec,
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queue->remaining_credit,
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queue->credit_timeout.expires,
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jiffies);
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dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id);
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seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n",
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queue->rx_queue_len, queue->rx_queue_max,
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skb_queue_len(&queue->rx_queue),
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netif_tx_queue_stopped(dev_queue) ? "stopped" : "running");
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return 0;
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}
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#define XENVIF_KICK_STR "kick"
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#define BUFFER_SIZE 32
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static ssize_t
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xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct xenvif_queue *queue =
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((struct seq_file *)filp->private_data)->private;
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int len;
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char write[BUFFER_SIZE];
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/* don't allow partial writes and check the length */
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if (*ppos != 0)
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return 0;
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if (count >= sizeof(write))
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return -ENOSPC;
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len = simple_write_to_buffer(write,
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sizeof(write) - 1,
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ppos,
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buf,
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count);
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if (len < 0)
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return len;
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write[len] = '\0';
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if (!strncmp(write, XENVIF_KICK_STR, sizeof(XENVIF_KICK_STR) - 1))
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xenvif_interrupt(0, (void *)queue);
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else {
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pr_warn("Unknown command to io_ring_q%d. Available: kick\n",
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queue->id);
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count = -EINVAL;
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}
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return count;
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}
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static int xenvif_io_ring_open(struct inode *inode, struct file *filp)
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{
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int ret;
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void *queue = NULL;
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if (inode->i_private)
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queue = inode->i_private;
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ret = single_open(filp, xenvif_read_io_ring, queue);
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filp->f_mode |= FMODE_PWRITE;
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return ret;
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}
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static const struct file_operations xenvif_dbg_io_ring_ops_fops = {
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.owner = THIS_MODULE,
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.open = xenvif_io_ring_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = xenvif_write_io_ring,
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};
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static int xenvif_read_ctrl(struct seq_file *m, void *v)
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{
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struct xenvif *vif = m->private;
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xenvif_dump_hash_info(vif, m);
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return 0;
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}
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static int xenvif_ctrl_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, xenvif_read_ctrl, inode->i_private);
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}
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static const struct file_operations xenvif_dbg_ctrl_ops_fops = {
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.owner = THIS_MODULE,
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.open = xenvif_ctrl_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void xenvif_debugfs_addif(struct xenvif *vif)
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{
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struct dentry *pfile;
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int i;
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if (IS_ERR_OR_NULL(xen_netback_dbg_root))
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return;
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vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name,
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xen_netback_dbg_root);
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if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) {
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for (i = 0; i < vif->num_queues; ++i) {
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char filename[sizeof("io_ring_q") + 4];
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snprintf(filename, sizeof(filename), "io_ring_q%d", i);
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pfile = debugfs_create_file(filename,
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S_IRUSR | S_IWUSR,
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vif->xenvif_dbg_root,
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&vif->queues[i],
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&xenvif_dbg_io_ring_ops_fops);
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if (IS_ERR_OR_NULL(pfile))
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pr_warn("Creation of io_ring file returned %ld!\n",
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PTR_ERR(pfile));
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}
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if (vif->ctrl_irq) {
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pfile = debugfs_create_file("ctrl",
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S_IRUSR,
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vif->xenvif_dbg_root,
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vif,
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&xenvif_dbg_ctrl_ops_fops);
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if (IS_ERR_OR_NULL(pfile))
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pr_warn("Creation of ctrl file returned %ld!\n",
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PTR_ERR(pfile));
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}
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} else
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netdev_warn(vif->dev,
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"Creation of vif debugfs dir returned %ld!\n",
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PTR_ERR(vif->xenvif_dbg_root));
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}
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static void xenvif_debugfs_delif(struct xenvif *vif)
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{
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if (IS_ERR_OR_NULL(xen_netback_dbg_root))
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return;
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if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root))
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debugfs_remove_recursive(vif->xenvif_dbg_root);
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vif->xenvif_dbg_root = NULL;
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}
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#endif /* CONFIG_DEBUG_FS */
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static int netback_remove(struct xenbus_device *dev)
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{
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struct backend_info *be = dev_get_drvdata(&dev->dev);
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set_backend_state(be, XenbusStateClosed);
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unregister_hotplug_status_watch(be);
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if (be->vif) {
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kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE);
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xen_unregister_watchers(be->vif);
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xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status");
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xenvif_free(be->vif);
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be->vif = NULL;
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}
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kfree(be->hotplug_script);
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kfree(be);
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dev_set_drvdata(&dev->dev, NULL);
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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 switch to InitWait.
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*/
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static int netback_probe(struct xenbus_device *dev,
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const struct xenbus_device_id *id)
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{
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const char *message;
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struct xenbus_transaction xbt;
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int err;
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int sg;
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const char *script;
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struct backend_info *be = kzalloc(sizeof(struct backend_info),
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GFP_KERNEL);
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if (!be) {
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xenbus_dev_fatal(dev, -ENOMEM,
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"allocating backend structure");
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return -ENOMEM;
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}
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be->dev = dev;
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dev_set_drvdata(&dev->dev, be);
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be->state = XenbusStateInitialising;
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err = xenbus_switch_state(dev, XenbusStateInitialising);
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if (err)
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goto fail;
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sg = 1;
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do {
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err = xenbus_transaction_start(&xbt);
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if (err) {
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xenbus_dev_fatal(dev, err, "starting transaction");
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goto fail;
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}
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err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg);
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if (err) {
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message = "writing feature-sg";
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goto abort_transaction;
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}
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err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4",
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"%d", sg);
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if (err) {
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message = "writing feature-gso-tcpv4";
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goto abort_transaction;
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}
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err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6",
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"%d", sg);
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if (err) {
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message = "writing feature-gso-tcpv6";
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goto abort_transaction;
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}
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/* We support partial checksum setup for IPv6 packets */
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err = xenbus_printf(xbt, dev->nodename,
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"feature-ipv6-csum-offload",
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"%d", 1);
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if (err) {
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message = "writing feature-ipv6-csum-offload";
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goto abort_transaction;
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}
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/* We support rx-copy path. */
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err = xenbus_printf(xbt, dev->nodename,
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"feature-rx-copy", "%d", 1);
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if (err) {
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message = "writing feature-rx-copy";
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goto abort_transaction;
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}
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/*
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* We don't support rx-flip path (except old guests who don't
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* grok this feature flag).
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*/
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err = xenbus_printf(xbt, dev->nodename,
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"feature-rx-flip", "%d", 0);
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if (err) {
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message = "writing feature-rx-flip";
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goto abort_transaction;
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}
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/* We support dynamic multicast-control. */
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err = xenbus_printf(xbt, dev->nodename,
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"feature-multicast-control", "%d", 1);
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if (err) {
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message = "writing feature-multicast-control";
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goto abort_transaction;
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}
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err = xenbus_printf(xbt, dev->nodename,
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"feature-dynamic-multicast-control",
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"%d", 1);
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if (err) {
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message = "writing feature-dynamic-multicast-control";
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goto abort_transaction;
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}
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err = xenbus_transaction_end(xbt, 0);
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} while (err == -EAGAIN);
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if (err) {
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xenbus_dev_fatal(dev, err, "completing transaction");
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goto fail;
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}
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/*
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* Split event channels support, this is optional so it is not
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* put inside the above loop.
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*/
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err = xenbus_printf(XBT_NIL, dev->nodename,
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"feature-split-event-channels",
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"%u", separate_tx_rx_irq);
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if (err)
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pr_debug("Error writing feature-split-event-channels\n");
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/* Multi-queue support: This is an optional feature. */
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err = xenbus_printf(XBT_NIL, dev->nodename,
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"multi-queue-max-queues", "%u", xenvif_max_queues);
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if (err)
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pr_debug("Error writing multi-queue-max-queues\n");
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err = xenbus_printf(XBT_NIL, dev->nodename,
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"feature-ctrl-ring",
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"%u", true);
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if (err)
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pr_debug("Error writing feature-ctrl-ring\n");
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script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL);
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if (IS_ERR(script)) {
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err = PTR_ERR(script);
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xenbus_dev_fatal(dev, err, "reading script");
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goto fail;
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}
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be->hotplug_script = script;
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|
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/* This kicks hotplug scripts, so do it immediately. */
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err = backend_create_xenvif(be);
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if (err)
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goto fail;
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return 0;
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abort_transaction:
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xenbus_transaction_end(xbt, 1);
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xenbus_dev_fatal(dev, err, "%s", message);
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fail:
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pr_debug("failed\n");
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netback_remove(dev);
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return err;
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}
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|
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/*
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* Handle the creation of the hotplug script environment. We add the script
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* and vif variables to the environment, for the benefit of the vif-* hotplug
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* scripts.
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*/
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static int netback_uevent(struct xenbus_device *xdev,
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struct kobj_uevent_env *env)
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{
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struct backend_info *be = dev_get_drvdata(&xdev->dev);
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if (!be)
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return 0;
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if (add_uevent_var(env, "script=%s", be->hotplug_script))
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return -ENOMEM;
|
|
|
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if (!be->vif)
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return 0;
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return add_uevent_var(env, "vif=%s", be->vif->dev->name);
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}
|
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|
|
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static int backend_create_xenvif(struct backend_info *be)
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{
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int err;
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long handle;
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struct xenbus_device *dev = be->dev;
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struct xenvif *vif;
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|
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if (be->vif != NULL)
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return 0;
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|
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err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle);
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if (err != 1) {
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xenbus_dev_fatal(dev, err, "reading handle");
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return (err < 0) ? err : -EINVAL;
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}
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|
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vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
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if (IS_ERR(vif)) {
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err = PTR_ERR(vif);
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xenbus_dev_fatal(dev, err, "creating interface");
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return err;
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}
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be->vif = vif;
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|
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kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
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return 0;
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}
|
|
|
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static void backend_disconnect(struct backend_info *be)
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|
{
|
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struct xenvif *vif = be->vif;
|
|
|
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if (vif) {
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unsigned int num_queues = vif->num_queues;
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unsigned int queue_index;
|
|
|
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xen_unregister_watchers(vif);
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#ifdef CONFIG_DEBUG_FS
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xenvif_debugfs_delif(vif);
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#endif /* CONFIG_DEBUG_FS */
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xenvif_disconnect_data(vif);
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|
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/* At this point some of the handlers may still be active
|
|
* so we need to have additional synchronization here.
|
|
*/
|
|
vif->num_queues = 0;
|
|
synchronize_net();
|
|
|
|
for (queue_index = 0; queue_index < num_queues; ++queue_index)
|
|
xenvif_deinit_queue(&vif->queues[queue_index]);
|
|
|
|
vfree(vif->queues);
|
|
vif->queues = NULL;
|
|
|
|
xenvif_disconnect_ctrl(vif);
|
|
}
|
|
}
|
|
|
|
static void backend_connect(struct backend_info *be)
|
|
{
|
|
if (be->vif)
|
|
connect(be);
|
|
}
|
|
|
|
static inline void backend_switch_state(struct backend_info *be,
|
|
enum xenbus_state state)
|
|
{
|
|
struct xenbus_device *dev = be->dev;
|
|
|
|
pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state));
|
|
be->state = state;
|
|
|
|
/* If we are waiting for a hotplug script then defer the
|
|
* actual xenbus state change.
|
|
*/
|
|
if (!be->have_hotplug_status_watch)
|
|
xenbus_switch_state(dev, state);
|
|
}
|
|
|
|
/* Handle backend state transitions:
|
|
*
|
|
* The backend state starts in Initialising and the following transitions are
|
|
* allowed.
|
|
*
|
|
* Initialising -> InitWait -> Connected
|
|
* \
|
|
* \ ^ \ |
|
|
* \ | \ |
|
|
* \ | \ |
|
|
* \ | \ |
|
|
* \ | \ |
|
|
* \ | \ |
|
|
* V | V V
|
|
*
|
|
* Closed <-> Closing
|
|
*
|
|
* The state argument specifies the eventual state of the backend and the
|
|
* function transitions to that state via the shortest path.
|
|
*/
|
|
static void set_backend_state(struct backend_info *be,
|
|
enum xenbus_state state)
|
|
{
|
|
while (be->state != state) {
|
|
switch (be->state) {
|
|
case XenbusStateInitialising:
|
|
switch (state) {
|
|
case XenbusStateInitWait:
|
|
case XenbusStateConnected:
|
|
case XenbusStateClosing:
|
|
backend_switch_state(be, XenbusStateInitWait);
|
|
break;
|
|
case XenbusStateClosed:
|
|
backend_switch_state(be, XenbusStateClosed);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
break;
|
|
case XenbusStateClosed:
|
|
switch (state) {
|
|
case XenbusStateInitWait:
|
|
case XenbusStateConnected:
|
|
backend_switch_state(be, XenbusStateInitWait);
|
|
break;
|
|
case XenbusStateClosing:
|
|
backend_switch_state(be, XenbusStateClosing);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
break;
|
|
case XenbusStateInitWait:
|
|
switch (state) {
|
|
case XenbusStateConnected:
|
|
backend_connect(be);
|
|
backend_switch_state(be, XenbusStateConnected);
|
|
break;
|
|
case XenbusStateClosing:
|
|
case XenbusStateClosed:
|
|
backend_switch_state(be, XenbusStateClosing);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
break;
|
|
case XenbusStateConnected:
|
|
switch (state) {
|
|
case XenbusStateInitWait:
|
|
case XenbusStateClosing:
|
|
case XenbusStateClosed:
|
|
backend_disconnect(be);
|
|
backend_switch_state(be, XenbusStateClosing);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
break;
|
|
case XenbusStateClosing:
|
|
switch (state) {
|
|
case XenbusStateInitWait:
|
|
case XenbusStateConnected:
|
|
case XenbusStateClosed:
|
|
backend_switch_state(be, XenbusStateClosed);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Callback received when the frontend's state changes.
|
|
*/
|
|
static void frontend_changed(struct xenbus_device *dev,
|
|
enum xenbus_state frontend_state)
|
|
{
|
|
struct backend_info *be = dev_get_drvdata(&dev->dev);
|
|
|
|
pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state));
|
|
|
|
be->frontend_state = frontend_state;
|
|
|
|
switch (frontend_state) {
|
|
case XenbusStateInitialising:
|
|
set_backend_state(be, XenbusStateInitWait);
|
|
break;
|
|
|
|
case XenbusStateInitialised:
|
|
break;
|
|
|
|
case XenbusStateConnected:
|
|
set_backend_state(be, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateClosing:
|
|
set_backend_state(be, XenbusStateClosing);
|
|
break;
|
|
|
|
case XenbusStateClosed:
|
|
set_backend_state(be, XenbusStateClosed);
|
|
if (xenbus_dev_is_online(dev))
|
|
break;
|
|
/* fall through if not online */
|
|
case XenbusStateUnknown:
|
|
set_backend_state(be, XenbusStateClosed);
|
|
device_unregister(&dev->dev);
|
|
break;
|
|
|
|
default:
|
|
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
|
|
frontend_state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void xen_net_read_rate(struct xenbus_device *dev,
|
|
unsigned long *bytes, unsigned long *usec)
|
|
{
|
|
char *s, *e;
|
|
unsigned long b, u;
|
|
char *ratestr;
|
|
|
|
/* Default to unlimited bandwidth. */
|
|
*bytes = ~0UL;
|
|
*usec = 0;
|
|
|
|
ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL);
|
|
if (IS_ERR(ratestr))
|
|
return;
|
|
|
|
s = ratestr;
|
|
b = simple_strtoul(s, &e, 10);
|
|
if ((s == e) || (*e != ','))
|
|
goto fail;
|
|
|
|
s = e + 1;
|
|
u = simple_strtoul(s, &e, 10);
|
|
if ((s == e) || (*e != '\0'))
|
|
goto fail;
|
|
|
|
*bytes = b;
|
|
*usec = u;
|
|
|
|
kfree(ratestr);
|
|
return;
|
|
|
|
fail:
|
|
pr_warn("Failed to parse network rate limit. Traffic unlimited.\n");
|
|
kfree(ratestr);
|
|
}
|
|
|
|
static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
|
|
{
|
|
char *s, *e, *macstr;
|
|
int i;
|
|
|
|
macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
|
|
if (IS_ERR(macstr))
|
|
return PTR_ERR(macstr);
|
|
|
|
for (i = 0; i < ETH_ALEN; i++) {
|
|
mac[i] = simple_strtoul(s, &e, 16);
|
|
if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
|
|
kfree(macstr);
|
|
return -ENOENT;
|
|
}
|
|
s = e+1;
|
|
}
|
|
|
|
kfree(macstr);
|
|
return 0;
|
|
}
|
|
|
|
static void xen_net_rate_changed(struct xenbus_watch *watch,
|
|
const char *path, const char *token)
|
|
{
|
|
struct xenvif *vif = container_of(watch, struct xenvif, credit_watch);
|
|
struct xenbus_device *dev = xenvif_to_xenbus_device(vif);
|
|
unsigned long credit_bytes;
|
|
unsigned long credit_usec;
|
|
unsigned int queue_index;
|
|
|
|
xen_net_read_rate(dev, &credit_bytes, &credit_usec);
|
|
for (queue_index = 0; queue_index < vif->num_queues; queue_index++) {
|
|
struct xenvif_queue *queue = &vif->queues[queue_index];
|
|
|
|
queue->credit_bytes = credit_bytes;
|
|
queue->credit_usec = credit_usec;
|
|
if (!mod_timer_pending(&queue->credit_timeout, jiffies) &&
|
|
queue->remaining_credit > queue->credit_bytes) {
|
|
queue->remaining_credit = queue->credit_bytes;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int xen_register_credit_watch(struct xenbus_device *dev,
|
|
struct xenvif *vif)
|
|
{
|
|
int err = 0;
|
|
char *node;
|
|
unsigned maxlen = strlen(dev->nodename) + sizeof("/rate");
|
|
|
|
if (vif->credit_watch.node)
|
|
return -EADDRINUSE;
|
|
|
|
node = kmalloc(maxlen, GFP_KERNEL);
|
|
if (!node)
|
|
return -ENOMEM;
|
|
snprintf(node, maxlen, "%s/rate", dev->nodename);
|
|
vif->credit_watch.node = node;
|
|
vif->credit_watch.callback = xen_net_rate_changed;
|
|
err = register_xenbus_watch(&vif->credit_watch);
|
|
if (err) {
|
|
pr_err("Failed to set watcher %s\n", vif->credit_watch.node);
|
|
kfree(node);
|
|
vif->credit_watch.node = NULL;
|
|
vif->credit_watch.callback = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void xen_unregister_credit_watch(struct xenvif *vif)
|
|
{
|
|
if (vif->credit_watch.node) {
|
|
unregister_xenbus_watch(&vif->credit_watch);
|
|
kfree(vif->credit_watch.node);
|
|
vif->credit_watch.node = NULL;
|
|
}
|
|
}
|
|
|
|
static void xen_mcast_ctrl_changed(struct xenbus_watch *watch,
|
|
const char *path, const char *token)
|
|
{
|
|
struct xenvif *vif = container_of(watch, struct xenvif,
|
|
mcast_ctrl_watch);
|
|
struct xenbus_device *dev = xenvif_to_xenbus_device(vif);
|
|
|
|
vif->multicast_control = !!xenbus_read_unsigned(dev->otherend,
|
|
"request-multicast-control", 0);
|
|
}
|
|
|
|
static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev,
|
|
struct xenvif *vif)
|
|
{
|
|
int err = 0;
|
|
char *node;
|
|
unsigned maxlen = strlen(dev->otherend) +
|
|
sizeof("/request-multicast-control");
|
|
|
|
if (vif->mcast_ctrl_watch.node) {
|
|
pr_err_ratelimited("Watch is already registered\n");
|
|
return -EADDRINUSE;
|
|
}
|
|
|
|
node = kmalloc(maxlen, GFP_KERNEL);
|
|
if (!node) {
|
|
pr_err("Failed to allocate memory for watch\n");
|
|
return -ENOMEM;
|
|
}
|
|
snprintf(node, maxlen, "%s/request-multicast-control",
|
|
dev->otherend);
|
|
vif->mcast_ctrl_watch.node = node;
|
|
vif->mcast_ctrl_watch.callback = xen_mcast_ctrl_changed;
|
|
err = register_xenbus_watch(&vif->mcast_ctrl_watch);
|
|
if (err) {
|
|
pr_err("Failed to set watcher %s\n",
|
|
vif->mcast_ctrl_watch.node);
|
|
kfree(node);
|
|
vif->mcast_ctrl_watch.node = NULL;
|
|
vif->mcast_ctrl_watch.callback = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void xen_unregister_mcast_ctrl_watch(struct xenvif *vif)
|
|
{
|
|
if (vif->mcast_ctrl_watch.node) {
|
|
unregister_xenbus_watch(&vif->mcast_ctrl_watch);
|
|
kfree(vif->mcast_ctrl_watch.node);
|
|
vif->mcast_ctrl_watch.node = NULL;
|
|
}
|
|
}
|
|
|
|
static void xen_register_watchers(struct xenbus_device *dev,
|
|
struct xenvif *vif)
|
|
{
|
|
xen_register_credit_watch(dev, vif);
|
|
xen_register_mcast_ctrl_watch(dev, vif);
|
|
}
|
|
|
|
static void xen_unregister_watchers(struct xenvif *vif)
|
|
{
|
|
xen_unregister_mcast_ctrl_watch(vif);
|
|
xen_unregister_credit_watch(vif);
|
|
}
|
|
|
|
static void unregister_hotplug_status_watch(struct backend_info *be)
|
|
{
|
|
if (be->have_hotplug_status_watch) {
|
|
unregister_xenbus_watch(&be->hotplug_status_watch);
|
|
kfree(be->hotplug_status_watch.node);
|
|
}
|
|
be->have_hotplug_status_watch = 0;
|
|
}
|
|
|
|
static void hotplug_status_changed(struct xenbus_watch *watch,
|
|
const char *path,
|
|
const char *token)
|
|
{
|
|
struct backend_info *be = container_of(watch,
|
|
struct backend_info,
|
|
hotplug_status_watch);
|
|
char *str;
|
|
unsigned int len;
|
|
|
|
str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len);
|
|
if (IS_ERR(str))
|
|
return;
|
|
if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) {
|
|
/* Complete any pending state change */
|
|
xenbus_switch_state(be->dev, be->state);
|
|
|
|
/* Not interested in this watch anymore. */
|
|
unregister_hotplug_status_watch(be);
|
|
}
|
|
kfree(str);
|
|
}
|
|
|
|
static int connect_ctrl_ring(struct backend_info *be)
|
|
{
|
|
struct xenbus_device *dev = be->dev;
|
|
struct xenvif *vif = be->vif;
|
|
unsigned int val;
|
|
grant_ref_t ring_ref;
|
|
unsigned int evtchn;
|
|
int err;
|
|
|
|
err = xenbus_scanf(XBT_NIL, dev->otherend,
|
|
"ctrl-ring-ref", "%u", &val);
|
|
if (err < 0)
|
|
goto done; /* The frontend does not have a control ring */
|
|
|
|
ring_ref = val;
|
|
|
|
err = xenbus_scanf(XBT_NIL, dev->otherend,
|
|
"event-channel-ctrl", "%u", &val);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(dev, err,
|
|
"reading %s/event-channel-ctrl",
|
|
dev->otherend);
|
|
goto fail;
|
|
}
|
|
|
|
evtchn = val;
|
|
|
|
err = xenvif_connect_ctrl(vif, ring_ref, evtchn);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err,
|
|
"mapping shared-frame %u port %u",
|
|
ring_ref, evtchn);
|
|
goto fail;
|
|
}
|
|
|
|
done:
|
|
return 0;
|
|
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static void connect(struct backend_info *be)
|
|
{
|
|
int err;
|
|
struct xenbus_device *dev = be->dev;
|
|
unsigned long credit_bytes, credit_usec;
|
|
unsigned int queue_index;
|
|
unsigned int requested_num_queues;
|
|
struct xenvif_queue *queue;
|
|
|
|
/* Check whether the frontend requested multiple queues
|
|
* and read the number requested.
|
|
*/
|
|
requested_num_queues = xenbus_read_unsigned(dev->otherend,
|
|
"multi-queue-num-queues", 1);
|
|
if (requested_num_queues > xenvif_max_queues) {
|
|
/* buggy or malicious guest */
|
|
xenbus_dev_fatal(dev, -EINVAL,
|
|
"guest requested %u queues, exceeding the maximum of %u.",
|
|
requested_num_queues, xenvif_max_queues);
|
|
return;
|
|
}
|
|
|
|
err = xen_net_read_mac(dev, be->vif->fe_dev_addr);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
|
|
return;
|
|
}
|
|
|
|
xen_net_read_rate(dev, &credit_bytes, &credit_usec);
|
|
xen_unregister_watchers(be->vif);
|
|
xen_register_watchers(dev, be->vif);
|
|
read_xenbus_vif_flags(be);
|
|
|
|
err = connect_ctrl_ring(be);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err, "connecting control ring");
|
|
return;
|
|
}
|
|
|
|
/* Use the number of queues requested by the frontend */
|
|
be->vif->queues = vzalloc(requested_num_queues *
|
|
sizeof(struct xenvif_queue));
|
|
if (!be->vif->queues) {
|
|
xenbus_dev_fatal(dev, -ENOMEM,
|
|
"allocating queues");
|
|
return;
|
|
}
|
|
|
|
be->vif->num_queues = requested_num_queues;
|
|
be->vif->stalled_queues = requested_num_queues;
|
|
|
|
for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) {
|
|
queue = &be->vif->queues[queue_index];
|
|
queue->vif = be->vif;
|
|
queue->id = queue_index;
|
|
snprintf(queue->name, sizeof(queue->name), "%s-q%u",
|
|
be->vif->dev->name, queue->id);
|
|
|
|
err = xenvif_init_queue(queue);
|
|
if (err) {
|
|
/* xenvif_init_queue() cleans up after itself on
|
|
* failure, but we need to clean up any previously
|
|
* initialised queues. Set num_queues to i so that
|
|
* earlier queues can be destroyed using the regular
|
|
* disconnect logic.
|
|
*/
|
|
be->vif->num_queues = queue_index;
|
|
goto err;
|
|
}
|
|
|
|
queue->credit_bytes = credit_bytes;
|
|
queue->remaining_credit = credit_bytes;
|
|
queue->credit_usec = credit_usec;
|
|
|
|
err = connect_data_rings(be, queue);
|
|
if (err) {
|
|
/* connect_data_rings() cleans up after itself on
|
|
* failure, but we need to clean up after
|
|
* xenvif_init_queue() here, and also clean up any
|
|
* previously initialised queues.
|
|
*/
|
|
xenvif_deinit_queue(queue);
|
|
be->vif->num_queues = queue_index;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
xenvif_debugfs_addif(be->vif);
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
/* Initialisation completed, tell core driver the number of
|
|
* active queues.
|
|
*/
|
|
rtnl_lock();
|
|
netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues);
|
|
netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues);
|
|
rtnl_unlock();
|
|
|
|
xenvif_carrier_on(be->vif);
|
|
|
|
unregister_hotplug_status_watch(be);
|
|
err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
|
|
hotplug_status_changed,
|
|
"%s/%s", dev->nodename, "hotplug-status");
|
|
if (!err)
|
|
be->have_hotplug_status_watch = 1;
|
|
|
|
netif_tx_wake_all_queues(be->vif->dev);
|
|
|
|
return;
|
|
|
|
err:
|
|
if (be->vif->num_queues > 0)
|
|
xenvif_disconnect_data(be->vif); /* Clean up existing queues */
|
|
for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index)
|
|
xenvif_deinit_queue(&be->vif->queues[queue_index]);
|
|
vfree(be->vif->queues);
|
|
be->vif->queues = NULL;
|
|
be->vif->num_queues = 0;
|
|
xenvif_disconnect_ctrl(be->vif);
|
|
return;
|
|
}
|
|
|
|
|
|
static int connect_data_rings(struct backend_info *be,
|
|
struct xenvif_queue *queue)
|
|
{
|
|
struct xenbus_device *dev = be->dev;
|
|
unsigned int num_queues = queue->vif->num_queues;
|
|
unsigned long tx_ring_ref, rx_ring_ref;
|
|
unsigned int tx_evtchn, rx_evtchn;
|
|
int err;
|
|
char *xspath;
|
|
size_t xspathsize;
|
|
const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */
|
|
|
|
/* If the frontend requested 1 queue, or we have fallen back
|
|
* to single queue due to lack of frontend support for multi-
|
|
* queue, expect the remaining XenStore keys in the toplevel
|
|
* directory. Otherwise, expect them in a subdirectory called
|
|
* queue-N.
|
|
*/
|
|
if (num_queues == 1) {
|
|
xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL);
|
|
if (!xspath) {
|
|
xenbus_dev_fatal(dev, -ENOMEM,
|
|
"reading ring references");
|
|
return -ENOMEM;
|
|
}
|
|
strcpy(xspath, dev->otherend);
|
|
} else {
|
|
xspathsize = strlen(dev->otherend) + xenstore_path_ext_size;
|
|
xspath = kzalloc(xspathsize, GFP_KERNEL);
|
|
if (!xspath) {
|
|
xenbus_dev_fatal(dev, -ENOMEM,
|
|
"reading ring references");
|
|
return -ENOMEM;
|
|
}
|
|
snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend,
|
|
queue->id);
|
|
}
|
|
|
|
err = xenbus_gather(XBT_NIL, xspath,
|
|
"tx-ring-ref", "%lu", &tx_ring_ref,
|
|
"rx-ring-ref", "%lu", &rx_ring_ref, NULL);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err,
|
|
"reading %s/ring-ref",
|
|
xspath);
|
|
goto err;
|
|
}
|
|
|
|
/* Try split event channels first, then single event channel. */
|
|
err = xenbus_gather(XBT_NIL, xspath,
|
|
"event-channel-tx", "%u", &tx_evtchn,
|
|
"event-channel-rx", "%u", &rx_evtchn, NULL);
|
|
if (err < 0) {
|
|
err = xenbus_scanf(XBT_NIL, xspath,
|
|
"event-channel", "%u", &tx_evtchn);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(dev, err,
|
|
"reading %s/event-channel(-tx/rx)",
|
|
xspath);
|
|
goto err;
|
|
}
|
|
rx_evtchn = tx_evtchn;
|
|
}
|
|
|
|
/* Map the shared frame, irq etc. */
|
|
err = xenvif_connect_data(queue, tx_ring_ref, rx_ring_ref,
|
|
tx_evtchn, rx_evtchn);
|
|
if (err) {
|
|
xenbus_dev_fatal(dev, err,
|
|
"mapping shared-frames %lu/%lu port tx %u rx %u",
|
|
tx_ring_ref, rx_ring_ref,
|
|
tx_evtchn, rx_evtchn);
|
|
goto err;
|
|
}
|
|
|
|
err = 0;
|
|
err: /* Regular return falls through with err == 0 */
|
|
kfree(xspath);
|
|
return err;
|
|
}
|
|
|
|
static int read_xenbus_vif_flags(struct backend_info *be)
|
|
{
|
|
struct xenvif *vif = be->vif;
|
|
struct xenbus_device *dev = be->dev;
|
|
unsigned int rx_copy;
|
|
int err;
|
|
|
|
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
|
|
&rx_copy);
|
|
if (err == -ENOENT) {
|
|
err = 0;
|
|
rx_copy = 0;
|
|
}
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
|
|
dev->otherend);
|
|
return err;
|
|
}
|
|
if (!rx_copy)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) {
|
|
/* - Reduce drain timeout to poll more frequently for
|
|
* Rx requests.
|
|
* - Disable Rx stall detection.
|
|
*/
|
|
be->vif->drain_timeout = msecs_to_jiffies(30);
|
|
be->vif->stall_timeout = 0;
|
|
}
|
|
|
|
vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0);
|
|
|
|
vif->gso_mask = 0;
|
|
|
|
if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0))
|
|
vif->gso_mask |= GSO_BIT(TCPV4);
|
|
|
|
if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0))
|
|
vif->gso_mask |= GSO_BIT(TCPV6);
|
|
|
|
vif->ip_csum = !xenbus_read_unsigned(dev->otherend,
|
|
"feature-no-csum-offload", 0);
|
|
|
|
vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend,
|
|
"feature-ipv6-csum-offload", 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct xenbus_device_id netback_ids[] = {
|
|
{ "vif" },
|
|
{ "" }
|
|
};
|
|
|
|
static struct xenbus_driver netback_driver = {
|
|
.ids = netback_ids,
|
|
.probe = netback_probe,
|
|
.remove = netback_remove,
|
|
.uevent = netback_uevent,
|
|
.otherend_changed = frontend_changed,
|
|
};
|
|
|
|
int xenvif_xenbus_init(void)
|
|
{
|
|
return xenbus_register_backend(&netback_driver);
|
|
}
|
|
|
|
void xenvif_xenbus_fini(void)
|
|
{
|
|
return xenbus_unregister_driver(&netback_driver);
|
|
}
|