| /* |
| * Virtual network driver for conversing with remote driver backends. |
| * |
| * Copyright (c) 2002-2005, K A Fraser |
| * Copyright (c) 2005, XenSource Ltd |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation; or, when distributed |
| * separately from the Linux kernel or incorporated into other |
| * software packages, subject to the following license: |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this source file (the "Software"), to deal in the Software without |
| * restriction, including without limitation the rights to use, copy, modify, |
| * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/ethtool.h> |
| #include <linux/if_ether.h> |
| #include <net/tcp.h> |
| #include <linux/udp.h> |
| #include <linux/moduleparam.h> |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| #include <net/ip.h> |
| |
| #include <xen/xen.h> |
| #include <xen/xenbus.h> |
| #include <xen/events.h> |
| #include <xen/page.h> |
| #include <xen/platform_pci.h> |
| #include <xen/grant_table.h> |
| |
| #include <xen/interface/io/netif.h> |
| #include <xen/interface/memory.h> |
| #include <xen/interface/grant_table.h> |
| |
| /* Module parameters */ |
| #define MAX_QUEUES_DEFAULT 8 |
| static unsigned int xennet_max_queues; |
| module_param_named(max_queues, xennet_max_queues, uint, 0644); |
| MODULE_PARM_DESC(max_queues, |
| "Maximum number of queues per virtual interface"); |
| |
| #define XENNET_TIMEOUT (5 * HZ) |
| |
| static const struct ethtool_ops xennet_ethtool_ops; |
| |
| struct netfront_cb { |
| int pull_to; |
| }; |
| |
| #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) |
| |
| #define RX_COPY_THRESHOLD 256 |
| |
| #define GRANT_INVALID_REF 0 |
| |
| #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) |
| #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) |
| |
| /* Minimum number of Rx slots (includes slot for GSO metadata). */ |
| #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) |
| |
| /* Queue name is interface name with "-qNNN" appended */ |
| #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) |
| |
| /* IRQ name is queue name with "-tx" or "-rx" appended */ |
| #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) |
| |
| static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
| |
| struct netfront_stats { |
| u64 packets; |
| u64 bytes; |
| struct u64_stats_sync syncp; |
| }; |
| |
| struct netfront_info; |
| |
| struct netfront_queue { |
| unsigned int id; /* Queue ID, 0-based */ |
| char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ |
| struct netfront_info *info; |
| |
| struct napi_struct napi; |
| |
| /* Split event channels support, tx_* == rx_* when using |
| * single event channel. |
| */ |
| unsigned int tx_evtchn, rx_evtchn; |
| unsigned int tx_irq, rx_irq; |
| /* Only used when split event channels support is enabled */ |
| char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ |
| char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ |
| |
| spinlock_t tx_lock; |
| struct xen_netif_tx_front_ring tx; |
| int tx_ring_ref; |
| |
| /* |
| * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries |
| * are linked from tx_skb_freelist through tx_link. |
| */ |
| struct sk_buff *tx_skbs[NET_TX_RING_SIZE]; |
| unsigned short tx_link[NET_TX_RING_SIZE]; |
| #define TX_LINK_NONE 0xffff |
| #define TX_PENDING 0xfffe |
| grant_ref_t gref_tx_head; |
| grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; |
| struct page *grant_tx_page[NET_TX_RING_SIZE]; |
| unsigned tx_skb_freelist; |
| unsigned int tx_pend_queue; |
| |
| spinlock_t rx_lock ____cacheline_aligned_in_smp; |
| struct xen_netif_rx_front_ring rx; |
| int rx_ring_ref; |
| |
| struct timer_list rx_refill_timer; |
| |
| struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
| grant_ref_t gref_rx_head; |
| grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; |
| |
| unsigned int rx_rsp_unconsumed; |
| spinlock_t rx_cons_lock; |
| }; |
| |
| struct netfront_info { |
| struct list_head list; |
| struct net_device *netdev; |
| |
| struct xenbus_device *xbdev; |
| |
| /* Multi-queue support */ |
| struct netfront_queue *queues; |
| |
| /* Statistics */ |
| struct netfront_stats __percpu *rx_stats; |
| struct netfront_stats __percpu *tx_stats; |
| |
| /* Is device behaving sane? */ |
| bool broken; |
| |
| atomic_t rx_gso_checksum_fixup; |
| }; |
| |
| struct netfront_rx_info { |
| struct xen_netif_rx_response rx; |
| struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; |
| }; |
| |
| /* |
| * Access macros for acquiring freeing slots in tx_skbs[]. |
| */ |
| |
| static void add_id_to_list(unsigned *head, unsigned short *list, |
| unsigned short id) |
| { |
| list[id] = *head; |
| *head = id; |
| } |
| |
| static unsigned short get_id_from_list(unsigned *head, unsigned short *list) |
| { |
| unsigned int id = *head; |
| |
| if (id != TX_LINK_NONE) { |
| *head = list[id]; |
| list[id] = TX_LINK_NONE; |
| } |
| return id; |
| } |
| |
| static int xennet_rxidx(RING_IDX idx) |
| { |
| return idx & (NET_RX_RING_SIZE - 1); |
| } |
| |
| static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, |
| RING_IDX ri) |
| { |
| int i = xennet_rxidx(ri); |
| struct sk_buff *skb = queue->rx_skbs[i]; |
| queue->rx_skbs[i] = NULL; |
| return skb; |
| } |
| |
| static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, |
| RING_IDX ri) |
| { |
| int i = xennet_rxidx(ri); |
| grant_ref_t ref = queue->grant_rx_ref[i]; |
| queue->grant_rx_ref[i] = GRANT_INVALID_REF; |
| return ref; |
| } |
| |
| #ifdef CONFIG_SYSFS |
| static const struct attribute_group xennet_dev_group; |
| #endif |
| |
| static bool xennet_can_sg(struct net_device *dev) |
| { |
| return dev->features & NETIF_F_SG; |
| } |
| |
| |
| static void rx_refill_timeout(unsigned long data) |
| { |
| struct netfront_queue *queue = (struct netfront_queue *)data; |
| napi_schedule(&queue->napi); |
| } |
| |
| static int netfront_tx_slot_available(struct netfront_queue *queue) |
| { |
| return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < |
| (NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1); |
| } |
| |
| static void xennet_maybe_wake_tx(struct netfront_queue *queue) |
| { |
| struct net_device *dev = queue->info->netdev; |
| struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); |
| |
| if (unlikely(netif_tx_queue_stopped(dev_queue)) && |
| netfront_tx_slot_available(queue) && |
| likely(netif_running(dev))) |
| netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); |
| } |
| |
| |
| static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) |
| { |
| struct sk_buff *skb; |
| struct page *page; |
| |
| skb = __netdev_alloc_skb(queue->info->netdev, |
| RX_COPY_THRESHOLD + NET_IP_ALIGN, |
| GFP_ATOMIC | __GFP_NOWARN); |
| if (unlikely(!skb)) |
| return NULL; |
| |
| page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
| if (!page) { |
| kfree_skb(skb); |
| return NULL; |
| } |
| skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); |
| |
| /* Align ip header to a 16 bytes boundary */ |
| skb_reserve(skb, NET_IP_ALIGN); |
| skb->dev = queue->info->netdev; |
| |
| return skb; |
| } |
| |
| |
| static void xennet_alloc_rx_buffers(struct netfront_queue *queue) |
| { |
| RING_IDX req_prod = queue->rx.req_prod_pvt; |
| int notify; |
| int err = 0; |
| |
| if (unlikely(!netif_carrier_ok(queue->info->netdev))) |
| return; |
| |
| for (req_prod = queue->rx.req_prod_pvt; |
| req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; |
| req_prod++) { |
| struct sk_buff *skb; |
| unsigned short id; |
| grant_ref_t ref; |
| struct page *page; |
| struct xen_netif_rx_request *req; |
| |
| skb = xennet_alloc_one_rx_buffer(queue); |
| if (!skb) { |
| err = -ENOMEM; |
| break; |
| } |
| |
| id = xennet_rxidx(req_prod); |
| |
| BUG_ON(queue->rx_skbs[id]); |
| queue->rx_skbs[id] = skb; |
| |
| ref = gnttab_claim_grant_reference(&queue->gref_rx_head); |
| WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
| queue->grant_rx_ref[id] = ref; |
| |
| page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
| |
| req = RING_GET_REQUEST(&queue->rx, req_prod); |
| gnttab_page_grant_foreign_access_ref_one(ref, |
| queue->info->xbdev->otherend_id, |
| page, |
| 0); |
| req->id = id; |
| req->gref = ref; |
| } |
| |
| queue->rx.req_prod_pvt = req_prod; |
| |
| /* Try again later if there are not enough requests or skb allocation |
| * failed. |
| * Enough requests is quantified as the sum of newly created slots and |
| * the unconsumed slots at the backend. |
| */ |
| if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN || |
| unlikely(err)) { |
| mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); |
| return; |
| } |
| |
| wmb(); /* barrier so backend seens requests */ |
| |
| RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); |
| if (notify) |
| notify_remote_via_irq(queue->rx_irq); |
| } |
| |
| static int xennet_open(struct net_device *dev) |
| { |
| struct netfront_info *np = netdev_priv(dev); |
| unsigned int num_queues = dev->real_num_tx_queues; |
| unsigned int i = 0; |
| struct netfront_queue *queue = NULL; |
| |
| if (!np->queues || np->broken) |
| return -ENODEV; |
| |
| for (i = 0; i < num_queues; ++i) { |
| queue = &np->queues[i]; |
| napi_enable(&queue->napi); |
| |
| spin_lock_bh(&queue->rx_lock); |
| if (netif_carrier_ok(dev)) { |
| xennet_alloc_rx_buffers(queue); |
| queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; |
| if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) |
| napi_schedule(&queue->napi); |
| } |
| spin_unlock_bh(&queue->rx_lock); |
| } |
| |
| netif_tx_start_all_queues(dev); |
| |
| return 0; |
| } |
| |
| static bool xennet_tx_buf_gc(struct netfront_queue *queue) |
| { |
| RING_IDX cons, prod; |
| unsigned short id; |
| struct sk_buff *skb; |
| bool more_to_do; |
| bool work_done = false; |
| const struct device *dev = &queue->info->netdev->dev; |
| |
| BUG_ON(!netif_carrier_ok(queue->info->netdev)); |
| |
| do { |
| prod = queue->tx.sring->rsp_prod; |
| if (RING_RESPONSE_PROD_OVERFLOW(&queue->tx, prod)) { |
| dev_alert(dev, "Illegal number of responses %u\n", |
| prod - queue->tx.rsp_cons); |
| goto err; |
| } |
| rmb(); /* Ensure we see responses up to 'rp'. */ |
| |
| for (cons = queue->tx.rsp_cons; cons != prod; cons++) { |
| struct xen_netif_tx_response txrsp; |
| |
| work_done = true; |
| |
| RING_COPY_RESPONSE(&queue->tx, cons, &txrsp); |
| if (txrsp.status == XEN_NETIF_RSP_NULL) |
| continue; |
| |
| id = txrsp.id; |
| if (id >= RING_SIZE(&queue->tx)) { |
| dev_alert(dev, |
| "Response has incorrect id (%u)\n", |
| id); |
| goto err; |
| } |
| if (queue->tx_link[id] != TX_PENDING) { |
| dev_alert(dev, |
| "Response for inactive request\n"); |
| goto err; |
| } |
| |
| queue->tx_link[id] = TX_LINK_NONE; |
| skb = queue->tx_skbs[id]; |
| queue->tx_skbs[id] = NULL; |
| if (unlikely(!gnttab_end_foreign_access_ref( |
| queue->grant_tx_ref[id], GNTMAP_readonly))) { |
| dev_alert(dev, |
| "Grant still in use by backend domain\n"); |
| goto err; |
| } |
| gnttab_release_grant_reference( |
| &queue->gref_tx_head, queue->grant_tx_ref[id]); |
| queue->grant_tx_ref[id] = GRANT_INVALID_REF; |
| queue->grant_tx_page[id] = NULL; |
| add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, id); |
| dev_kfree_skb_irq(skb); |
| } |
| |
| queue->tx.rsp_cons = prod; |
| |
| RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); |
| } while (more_to_do); |
| |
| xennet_maybe_wake_tx(queue); |
| |
| return work_done; |
| |
| err: |
| queue->info->broken = true; |
| dev_alert(dev, "Disabled for further use\n"); |
| |
| return work_done; |
| } |
| |
| struct xennet_gnttab_make_txreq { |
| struct netfront_queue *queue; |
| struct sk_buff *skb; |
| struct page *page; |
| struct xen_netif_tx_request *tx; /* Last request on ring page */ |
| struct xen_netif_tx_request tx_local; /* Last request local copy*/ |
| unsigned int size; |
| }; |
| |
| static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, |
| unsigned int len, void *data) |
| { |
| struct xennet_gnttab_make_txreq *info = data; |
| unsigned int id; |
| struct xen_netif_tx_request *tx; |
| grant_ref_t ref; |
| /* convenient aliases */ |
| struct page *page = info->page; |
| struct netfront_queue *queue = info->queue; |
| struct sk_buff *skb = info->skb; |
| |
| id = get_id_from_list(&queue->tx_skb_freelist, queue->tx_link); |
| tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
| ref = gnttab_claim_grant_reference(&queue->gref_tx_head); |
| WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
| |
| gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, |
| gfn, GNTMAP_readonly); |
| |
| queue->tx_skbs[id] = skb; |
| queue->grant_tx_page[id] = page; |
| queue->grant_tx_ref[id] = ref; |
| |
| info->tx_local.id = id; |
| info->tx_local.gref = ref; |
| info->tx_local.offset = offset; |
| info->tx_local.size = len; |
| info->tx_local.flags = 0; |
| |
| *tx = info->tx_local; |
| |
| /* |
| * Put the request in the pending queue, it will be set to be pending |
| * when the producer index is about to be raised. |
| */ |
| add_id_to_list(&queue->tx_pend_queue, queue->tx_link, id); |
| |
| info->tx = tx; |
| info->size += info->tx_local.size; |
| } |
| |
| static struct xen_netif_tx_request *xennet_make_first_txreq( |
| struct xennet_gnttab_make_txreq *info, |
| unsigned int offset, unsigned int len) |
| { |
| info->size = 0; |
| |
| gnttab_for_one_grant(info->page, offset, len, xennet_tx_setup_grant, info); |
| |
| return info->tx; |
| } |
| |
| static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, |
| unsigned int len, void *data) |
| { |
| struct xennet_gnttab_make_txreq *info = data; |
| |
| info->tx->flags |= XEN_NETTXF_more_data; |
| skb_get(info->skb); |
| xennet_tx_setup_grant(gfn, offset, len, data); |
| } |
| |
| static void xennet_make_txreqs( |
| struct xennet_gnttab_make_txreq *info, |
| struct page *page, |
| unsigned int offset, unsigned int len) |
| { |
| /* Skip unused frames from start of page */ |
| page += offset >> PAGE_SHIFT; |
| offset &= ~PAGE_MASK; |
| |
| while (len) { |
| info->page = page; |
| info->size = 0; |
| |
| gnttab_foreach_grant_in_range(page, offset, len, |
| xennet_make_one_txreq, |
| info); |
| |
| page++; |
| offset = 0; |
| len -= info->size; |
| } |
| } |
| |
| /* |
| * Count how many ring slots are required to send this skb. Each frag |
| * might be a compound page. |
| */ |
| static int xennet_count_skb_slots(struct sk_buff *skb) |
| { |
| int i, frags = skb_shinfo(skb)->nr_frags; |
| int slots; |
| |
| slots = gnttab_count_grant(offset_in_page(skb->data), |
| skb_headlen(skb)); |
| |
| for (i = 0; i < frags; i++) { |
| skb_frag_t *frag = skb_shinfo(skb)->frags + i; |
| unsigned long size = skb_frag_size(frag); |
| unsigned long offset = frag->page_offset; |
| |
| /* Skip unused frames from start of page */ |
| offset &= ~PAGE_MASK; |
| |
| slots += gnttab_count_grant(offset, size); |
| } |
| |
| return slots; |
| } |
| |
| static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, |
| void *accel_priv, select_queue_fallback_t fallback) |
| { |
| unsigned int num_queues = dev->real_num_tx_queues; |
| u32 hash; |
| u16 queue_idx; |
| |
| /* First, check if there is only one queue */ |
| if (num_queues == 1) { |
| queue_idx = 0; |
| } else { |
| hash = skb_get_hash(skb); |
| queue_idx = hash % num_queues; |
| } |
| |
| return queue_idx; |
| } |
| |
| static void xennet_mark_tx_pending(struct netfront_queue *queue) |
| { |
| unsigned int i; |
| |
| while ((i = get_id_from_list(&queue->tx_pend_queue, queue->tx_link)) != |
| TX_LINK_NONE) |
| queue->tx_link[i] = TX_PENDING; |
| } |
| |
| #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) |
| |
| static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct netfront_info *np = netdev_priv(dev); |
| struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); |
| struct xen_netif_tx_request *first_tx; |
| unsigned int i; |
| int notify; |
| int slots; |
| struct page *page; |
| unsigned int offset; |
| unsigned int len; |
| unsigned long flags; |
| struct netfront_queue *queue = NULL; |
| struct xennet_gnttab_make_txreq info = { }; |
| unsigned int num_queues = dev->real_num_tx_queues; |
| u16 queue_index; |
| struct sk_buff *nskb; |
| |
| /* Drop the packet if no queues are set up */ |
| if (num_queues < 1) |
| goto drop; |
| if (unlikely(np->broken)) |
| goto drop; |
| /* Determine which queue to transmit this SKB on */ |
| queue_index = skb_get_queue_mapping(skb); |
| queue = &np->queues[queue_index]; |
| |
| /* If skb->len is too big for wire format, drop skb and alert |
| * user about misconfiguration. |
| */ |
| if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { |
| net_alert_ratelimited( |
| "xennet: skb->len = %u, too big for wire format\n", |
| skb->len); |
| goto drop; |
| } |
| |
| slots = xennet_count_skb_slots(skb); |
| if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { |
| net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", |
| slots, skb->len); |
| if (skb_linearize(skb)) |
| goto drop; |
| } |
| |
| page = virt_to_page(skb->data); |
| offset = offset_in_page(skb->data); |
| |
| /* The first req should be at least ETH_HLEN size or the packet will be |
| * dropped by netback. |
| */ |
| if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { |
| nskb = skb_copy(skb, GFP_ATOMIC); |
| if (!nskb) |
| goto drop; |
| dev_consume_skb_any(skb); |
| skb = nskb; |
| page = virt_to_page(skb->data); |
| offset = offset_in_page(skb->data); |
| } |
| |
| len = skb_headlen(skb); |
| |
| spin_lock_irqsave(&queue->tx_lock, flags); |
| |
| if (unlikely(!netif_carrier_ok(dev) || |
| (slots > 1 && !xennet_can_sg(dev)) || |
| netif_needs_gso(skb, netif_skb_features(skb)))) { |
| spin_unlock_irqrestore(&queue->tx_lock, flags); |
| goto drop; |
| } |
| |
| /* First request for the linear area. */ |
| info.queue = queue; |
| info.skb = skb; |
| info.page = page; |
| first_tx = xennet_make_first_txreq(&info, offset, len); |
| offset += info.tx_local.size; |
| if (offset == PAGE_SIZE) { |
| page++; |
| offset = 0; |
| } |
| len -= info.tx_local.size; |
| |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| /* local packet? */ |
| first_tx->flags |= XEN_NETTXF_csum_blank | |
| XEN_NETTXF_data_validated; |
| else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
| /* remote but checksummed. */ |
| first_tx->flags |= XEN_NETTXF_data_validated; |
| |
| /* Optional extra info after the first request. */ |
| if (skb_shinfo(skb)->gso_size) { |
| struct xen_netif_extra_info *gso; |
| |
| gso = (struct xen_netif_extra_info *) |
| RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
| |
| first_tx->flags |= XEN_NETTXF_extra_info; |
| |
| gso->u.gso.size = skb_shinfo(skb)->gso_size; |
| gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? |
| XEN_NETIF_GSO_TYPE_TCPV6 : |
| 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; |
| } |
| |
| /* Requests for the rest of the linear area. */ |
| xennet_make_txreqs(&info, page, offset, len); |
| |
| /* Requests for all the frags. */ |
| for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| xennet_make_txreqs(&info, skb_frag_page(frag), |
| frag->page_offset, |
| skb_frag_size(frag)); |
| } |
| |
| /* First request has the packet length. */ |
| first_tx->size = skb->len; |
| |
| xennet_mark_tx_pending(queue); |
| |
| RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); |
| if (notify) |
| notify_remote_via_irq(queue->tx_irq); |
| |
| u64_stats_update_begin(&tx_stats->syncp); |
| tx_stats->bytes += skb->len; |
| tx_stats->packets++; |
| u64_stats_update_end(&tx_stats->syncp); |
| |
| /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ |
| xennet_tx_buf_gc(queue); |
| |
| if (!netfront_tx_slot_available(queue)) |
| netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); |
| |
| spin_unlock_irqrestore(&queue->tx_lock, flags); |
| |
| return NETDEV_TX_OK; |
| |
| drop: |
| dev->stats.tx_dropped++; |
| dev_kfree_skb_any(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| static int xennet_close(struct net_device *dev) |
| { |
| struct netfront_info *np = netdev_priv(dev); |
| unsigned int num_queues = dev->real_num_tx_queues; |
| unsigned int i; |
| struct netfront_queue *queue; |
| netif_tx_stop_all_queues(np->netdev); |
| for (i = 0; i < num_queues; ++i) { |
| queue = &np->queues[i]; |
| napi_disable(&queue->napi); |
| } |
| return 0; |
| } |
| |
| static void xennet_set_rx_rsp_cons(struct netfront_queue *queue, RING_IDX val) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&queue->rx_cons_lock, flags); |
| queue->rx.rsp_cons = val; |
| queue->rx_rsp_unconsumed = RING_HAS_UNCONSUMED_RESPONSES(&queue->rx); |
| spin_unlock_irqrestore(&queue->rx_cons_lock, flags); |
| } |
| |
| static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, |
| grant_ref_t ref) |
| { |
| int new = xennet_rxidx(queue->rx.req_prod_pvt); |
| |
| BUG_ON(queue->rx_skbs[new]); |
| queue->rx_skbs[new] = skb; |
| queue->grant_rx_ref[new] = ref; |
| RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; |
| RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; |
| queue->rx.req_prod_pvt++; |
| } |
| |
| static int xennet_get_extras(struct netfront_queue *queue, |
| struct xen_netif_extra_info *extras, |
| RING_IDX rp) |
| |
| { |
| struct xen_netif_extra_info extra; |
| struct device *dev = &queue->info->netdev->dev; |
| RING_IDX cons = queue->rx.rsp_cons; |
| int err = 0; |
| |
| do { |
| struct sk_buff *skb; |
| grant_ref_t ref; |
| |
| if (unlikely(cons + 1 == rp)) { |
| if (net_ratelimit()) |
| dev_warn(dev, "Missing extra info\n"); |
| err = -EBADR; |
| break; |
| } |
| |
| RING_COPY_RESPONSE(&queue->rx, ++cons, &extra); |
| |
| if (unlikely(!extra.type || |
| extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { |
| if (net_ratelimit()) |
| dev_warn(dev, "Invalid extra type: %d\n", |
| extra.type); |
| err = -EINVAL; |
| } else { |
| extras[extra.type - 1] = extra; |
| } |
| |
| skb = xennet_get_rx_skb(queue, cons); |
| ref = xennet_get_rx_ref(queue, cons); |
| xennet_move_rx_slot(queue, skb, ref); |
| } while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); |
| |
| xennet_set_rx_rsp_cons(queue, cons); |
| return err; |
| } |
| |
| static int xennet_get_responses(struct netfront_queue *queue, |
| struct netfront_rx_info *rinfo, RING_IDX rp, |
| struct sk_buff_head *list) |
| { |
| struct xen_netif_rx_response *rx = &rinfo->rx, rx_local; |
| struct xen_netif_extra_info *extras = rinfo->extras; |
| struct device *dev = &queue->info->netdev->dev; |
| RING_IDX cons = queue->rx.rsp_cons; |
| struct sk_buff *skb = xennet_get_rx_skb(queue, cons); |
| grant_ref_t ref = xennet_get_rx_ref(queue, cons); |
| int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD); |
| int slots = 1; |
| int err = 0; |
| |
| if (rx->flags & XEN_NETRXF_extra_info) { |
| err = xennet_get_extras(queue, extras, rp); |
| cons = queue->rx.rsp_cons; |
| } |
| |
| for (;;) { |
| if (unlikely(rx->status < 0 || |
| rx->offset + rx->status > XEN_PAGE_SIZE)) { |
| if (net_ratelimit()) |
| dev_warn(dev, "rx->offset: %u, size: %d\n", |
| rx->offset, rx->status); |
| xennet_move_rx_slot(queue, skb, ref); |
| err = -EINVAL; |
| goto next; |
| } |
| |
| /* |
| * 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 backend. |
| */ |
| if (ref == GRANT_INVALID_REF) { |
| if (net_ratelimit()) |
| dev_warn(dev, "Bad rx response id %d.\n", |
| rx->id); |
| err = -EINVAL; |
| goto next; |
| } |
| |
| if (!gnttab_end_foreign_access_ref(ref, 0)) { |
| dev_alert(dev, |
| "Grant still in use by backend domain\n"); |
| queue->info->broken = true; |
| dev_alert(dev, "Disabled for further use\n"); |
| return -EINVAL; |
| } |
| |
| gnttab_release_grant_reference(&queue->gref_rx_head, ref); |
| |
| __skb_queue_tail(list, skb); |
| |
| next: |
| if (!(rx->flags & XEN_NETRXF_more_data)) |
| break; |
| |
| if (cons + slots == rp) { |
| if (net_ratelimit()) |
| dev_warn(dev, "Need more slots\n"); |
| err = -ENOENT; |
| break; |
| } |
| |
| RING_COPY_RESPONSE(&queue->rx, cons + slots, &rx_local); |
| rx = &rx_local; |
| skb = xennet_get_rx_skb(queue, cons + slots); |
| ref = xennet_get_rx_ref(queue, cons + slots); |
| slots++; |
| } |
| |
| if (unlikely(slots > max)) { |
| if (net_ratelimit()) |
| dev_warn(dev, "Too many slots\n"); |
| err = -E2BIG; |
| } |
| |
| if (unlikely(err)) |
| xennet_set_rx_rsp_cons(queue, cons + slots); |
| |
| return err; |
| } |
| |
| static int xennet_set_skb_gso(struct sk_buff *skb, |
| struct xen_netif_extra_info *gso) |
| { |
| if (!gso->u.gso.size) { |
| if (net_ratelimit()) |
| pr_warn("GSO size must not be zero\n"); |
| return -EINVAL; |
| } |
| |
| if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && |
| gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { |
| if (net_ratelimit()) |
| pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
| return -EINVAL; |
| } |
| |
| skb_shinfo(skb)->gso_size = gso->u.gso.size; |
| skb_shinfo(skb)->gso_type = |
| (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? |
| SKB_GSO_TCPV4 : |
| SKB_GSO_TCPV6; |
| |
| /* Header must be checked, and gso_segs computed. */ |
| skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| skb_shinfo(skb)->gso_segs = 0; |
| |
| return 0; |
| } |
| |
| static int xennet_fill_frags(struct netfront_queue *queue, |
| struct sk_buff *skb, |
| struct sk_buff_head *list) |
| { |
| RING_IDX cons = queue->rx.rsp_cons; |
| struct sk_buff *nskb; |
| |
| while ((nskb = __skb_dequeue(list))) { |
| struct xen_netif_rx_response rx; |
| skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
| |
| RING_COPY_RESPONSE(&queue->rx, ++cons, &rx); |
| |
| if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) { |
| unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
| |
| BUG_ON(pull_to < skb_headlen(skb)); |
| __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
| } |
| if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) { |
| xennet_set_rx_rsp_cons(queue, |
| ++cons + skb_queue_len(list)); |
| kfree_skb(nskb); |
| return -ENOENT; |
| } |
| |
| skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
| skb_frag_page(nfrag), |
| rx.offset, rx.status, PAGE_SIZE); |
| |
| skb_shinfo(nskb)->nr_frags = 0; |
| kfree_skb(nskb); |
| } |
| |
| xennet_set_rx_rsp_cons(queue, cons); |
| |
| return 0; |
| } |
| |
| static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
| { |
| bool recalculate_partial_csum = false; |
| |
| /* |
| * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy |
| * peers can fail to set NETRXF_csum_blank when sending a GSO |
| * frame. In this case force the SKB to CHECKSUM_PARTIAL and |
| * recalculate the partial checksum. |
| */ |
| if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { |
| struct netfront_info *np = netdev_priv(dev); |
| atomic_inc(&np->rx_gso_checksum_fixup); |
| skb->ip_summed = CHECKSUM_PARTIAL; |
| recalculate_partial_csum = true; |
| } |
| |
| /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ |
| if (skb->ip_summed != CHECKSUM_PARTIAL) |
| return 0; |
| |
| return skb_checksum_setup(skb, recalculate_partial_csum); |
| } |
| |
| static int handle_incoming_queue(struct netfront_queue *queue, |
| struct sk_buff_head *rxq) |
| { |
| struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); |
| int packets_dropped = 0; |
| struct sk_buff *skb; |
| |
| while ((skb = __skb_dequeue(rxq)) != NULL) { |
| int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
| |
| if (pull_to > skb_headlen(skb)) |
| __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
| |
| /* Ethernet work: Delayed to here as it peeks the header. */ |
| skb->protocol = eth_type_trans(skb, queue->info->netdev); |
| skb_reset_network_header(skb); |
| |
| if (checksum_setup(queue->info->netdev, skb)) { |
| kfree_skb(skb); |
| packets_dropped++; |
| queue->info->netdev->stats.rx_errors++; |
| continue; |
| } |
| |
| u64_stats_update_begin(&rx_stats->syncp); |
| rx_stats->packets++; |
| rx_stats->bytes += skb->len; |
| u64_stats_update_end(&rx_stats->syncp); |
| |
| /* Pass it up. */ |
| napi_gro_receive(&queue->napi, skb); |
| } |
| |
| return packets_dropped; |
| } |
| |
| static int xennet_poll(struct napi_struct *napi, int budget) |
| { |
| struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); |
| struct net_device *dev = queue->info->netdev; |
| struct sk_buff *skb; |
| struct netfront_rx_info rinfo; |
| struct xen_netif_rx_response *rx = &rinfo.rx; |
| struct xen_netif_extra_info *extras = rinfo.extras; |
| RING_IDX i, rp; |
| int work_done; |
| struct sk_buff_head rxq; |
| struct sk_buff_head errq; |
| struct sk_buff_head tmpq; |
| int err; |
| |
| spin_lock(&queue->rx_lock); |
| |
| skb_queue_head_init(&rxq); |
| skb_queue_head_init(&errq); |
| skb_queue_head_init(&tmpq); |
| |
| rp = queue->rx.sring->rsp_prod; |
| if (RING_RESPONSE_PROD_OVERFLOW(&queue->rx, rp)) { |
| dev_alert(&dev->dev, "Illegal number of responses %u\n", |
| rp - queue->rx.rsp_cons); |
| queue->info->broken = true; |
| spin_unlock(&queue->rx_lock); |
| return 0; |
| } |
| rmb(); /* Ensure we see queued responses up to 'rp'. */ |
| |
| i = queue->rx.rsp_cons; |
| work_done = 0; |
| while ((i != rp) && (work_done < budget)) { |
| RING_COPY_RESPONSE(&queue->rx, i, rx); |
| memset(extras, 0, sizeof(rinfo.extras)); |
| |
| err = xennet_get_responses(queue, &rinfo, rp, &tmpq); |
| |
| if (unlikely(err)) { |
| if (queue->info->broken) { |
| spin_unlock(&queue->rx_lock); |
| return 0; |
| } |
| err: |
| while ((skb = __skb_dequeue(&tmpq))) |
| __skb_queue_tail(&errq, skb); |
| dev->stats.rx_errors++; |
| i = queue->rx.rsp_cons; |
| continue; |
| } |
| |
| skb = __skb_dequeue(&tmpq); |
| |
| if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
| struct xen_netif_extra_info *gso; |
| gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; |
| |
| if (unlikely(xennet_set_skb_gso(skb, gso))) { |
| __skb_queue_head(&tmpq, skb); |
| xennet_set_rx_rsp_cons(queue, |
| queue->rx.rsp_cons + |
| skb_queue_len(&tmpq)); |
| goto err; |
| } |
| } |
| |
| NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
| if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) |
| NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; |
| |
| skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
| skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); |
| skb->data_len = rx->status; |
| skb->len += rx->status; |
| |
| if (unlikely(xennet_fill_frags(queue, skb, &tmpq))) |
| goto err; |
| |
| if (rx->flags & XEN_NETRXF_csum_blank) |
| skb->ip_summed = CHECKSUM_PARTIAL; |
| else if (rx->flags & XEN_NETRXF_data_validated) |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| __skb_queue_tail(&rxq, skb); |
| |
| i = queue->rx.rsp_cons + 1; |
| xennet_set_rx_rsp_cons(queue, i); |
| work_done++; |
| } |
| |
| __skb_queue_purge(&errq); |
| |
| work_done -= handle_incoming_queue(queue, &rxq); |
| |
| xennet_alloc_rx_buffers(queue); |
| |
| if (work_done < budget) { |
| int more_to_do = 0; |
| |
| napi_complete_done(napi, work_done); |
| |
| RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); |
| if (more_to_do) |
| napi_schedule(napi); |
| } |
| |
| spin_unlock(&queue->rx_lock); |
| |
| return work_done; |
| } |
| |
| static int xennet_change_mtu(struct net_device *dev, int mtu) |
| { |
| int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; |
| |
| if (mtu > max) |
| return -EINVAL; |
| dev->mtu = mtu; |
| return 0; |
| } |
| |
| static void xennet_get_stats64(struct net_device *dev, |
| struct rtnl_link_stats64 *tot) |
| { |
| struct netfront_info *np = netdev_priv(dev); |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); |
| struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); |
| u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| unsigned int start; |
| |
| do { |
| start = u64_stats_fetch_begin_irq(&tx_stats->syncp); |
| tx_packets = tx_stats->packets; |
| tx_bytes = tx_stats->bytes; |
| } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); |
| |
| do { |
| start = u64_stats_fetch_begin_irq(&rx_stats->syncp); |
| rx_packets = rx_stats->packets; |
| rx_bytes = rx_stats->bytes; |
| } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); |
| |
| tot->rx_packets += rx_packets; |
| tot->tx_packets += tx_packets; |
| tot->rx_bytes += rx_bytes; |
| tot->tx_bytes += tx_bytes; |
| } |
| |
| tot->rx_errors = dev->stats.rx_errors; |
| tot->tx_dropped = dev->stats.tx_dropped; |
| } |
| |
| static void xennet_release_tx_bufs(struct netfront_queue *queue) |
| { |
| struct sk_buff *skb; |
| int i; |
| |
| for (i = 0; i < NET_TX_RING_SIZE; i++) { |
| /* Skip over entries which are actually freelist references */ |
| if (!queue->tx_skbs[i]) |
| continue; |
| |
| skb = queue->tx_skbs[i]; |
| queue->tx_skbs[i] = NULL; |
| get_page(queue->grant_tx_page[i]); |
| gnttab_end_foreign_access(queue->grant_tx_ref[i], |
| GNTMAP_readonly, |
| (unsigned long)page_address(queue->grant_tx_page[i])); |
| queue->grant_tx_page[i] = NULL; |
| queue->grant_tx_ref[i] = GRANT_INVALID_REF; |
| add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, i); |
| dev_kfree_skb_irq(skb); |
| } |
| } |
| |
| static void xennet_release_rx_bufs(struct netfront_queue *queue) |
| { |
| int id, ref; |
| |
| spin_lock_bh(&queue->rx_lock); |
| |
| for (id = 0; id < NET_RX_RING_SIZE; id++) { |
| struct sk_buff *skb; |
| struct page *page; |
| |
| skb = queue->rx_skbs[id]; |
| if (!skb) |
| continue; |
| |
| ref = queue->grant_rx_ref[id]; |
| if (ref == GRANT_INVALID_REF) |
| continue; |
| |
| page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
| |
| /* gnttab_end_foreign_access() needs a page ref until |
| * foreign access is ended (which may be deferred). |
| */ |
| get_page(page); |
| gnttab_end_foreign_access(ref, 0, |
| (unsigned long)page_address(page)); |
| queue->grant_rx_ref[id] = GRANT_INVALID_REF; |
| |
| kfree_skb(skb); |
| } |
| |
| spin_unlock_bh(&queue->rx_lock); |
| } |
| |
| static netdev_features_t xennet_fix_features(struct net_device *dev, |
| netdev_features_t features) |
| { |
| struct netfront_info *np = netdev_priv(dev); |
| |
| if (features & NETIF_F_SG && |
| !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) |
| features &= ~NETIF_F_SG; |
| |
| if (features & NETIF_F_IPV6_CSUM && |
| !xenbus_read_unsigned(np->xbdev->otherend, |
| "feature-ipv6-csum-offload", 0)) |
| features &= ~NETIF_F_IPV6_CSUM; |
| |
| if (features & NETIF_F_TSO && |
| !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) |
| features &= ~NETIF_F_TSO; |
| |
| if (features & NETIF_F_TSO6 && |
| !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) |
| features &= ~NETIF_F_TSO6; |
| |
| return features; |
| } |
| |
| static int xennet_set_features(struct net_device *dev, |
| netdev_features_t features) |
| { |
| if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { |
| netdev_info(dev, "Reducing MTU because no SG offload"); |
| dev->mtu = ETH_DATA_LEN; |
| } |
| |
| return 0; |
| } |
| |
| static bool xennet_handle_tx(struct netfront_queue *queue, unsigned int *eoi) |
| { |
| unsigned long flags; |
| |
| if (unlikely(queue->info->broken)) |
| return false; |
| |
| spin_lock_irqsave(&queue->tx_lock, flags); |
| if (xennet_tx_buf_gc(queue)) |
| *eoi = 0; |
| spin_unlock_irqrestore(&queue->tx_lock, flags); |
| |
| return true; |
| } |
| |
| static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
| { |
| unsigned int eoiflag = XEN_EOI_FLAG_SPURIOUS; |
| |
| if (likely(xennet_handle_tx(dev_id, &eoiflag))) |
| xen_irq_lateeoi(irq, eoiflag); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static bool xennet_handle_rx(struct netfront_queue *queue, unsigned int *eoi) |
| { |
| unsigned int work_queued; |
| unsigned long flags; |
| |
| if (unlikely(queue->info->broken)) |
| return false; |
| |
| spin_lock_irqsave(&queue->rx_cons_lock, flags); |
| work_queued = RING_HAS_UNCONSUMED_RESPONSES(&queue->rx); |
| if (work_queued > queue->rx_rsp_unconsumed) { |
| queue->rx_rsp_unconsumed = work_queued; |
| *eoi = 0; |
| } else if (unlikely(work_queued < queue->rx_rsp_unconsumed)) { |
| const struct device *dev = &queue->info->netdev->dev; |
| |
| spin_unlock_irqrestore(&queue->rx_cons_lock, flags); |
| dev_alert(dev, "RX producer index going backwards\n"); |
| dev_alert(dev, "Disabled for further use\n"); |
| queue->info->broken = true; |
| return false; |
| } |
| spin_unlock_irqrestore(&queue->rx_cons_lock, flags); |
| |
| if (likely(netif_carrier_ok(queue->info->netdev) && work_queued)) |
| napi_schedule(&queue->napi); |
| |
| return true; |
| } |
| |
| static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) |
| { |
| unsigned int eoiflag = XEN_EOI_FLAG_SPURIOUS; |
| |
| if (likely(xennet_handle_rx(dev_id, &eoiflag))) |
| xen_irq_lateeoi(irq, eoiflag); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
| { |
| unsigned int eoiflag = XEN_EOI_FLAG_SPURIOUS; |
| |
| if (xennet_handle_tx(dev_id, &eoiflag) && |
| xennet_handle_rx(dev_id, &eoiflag)) |
| xen_irq_lateeoi(irq, eoiflag); |
| |
| return IRQ_HANDLED; |
| } |
| |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| static void xennet_poll_controller(struct net_device *dev) |
| { |
| /* Poll each queue */ |
| struct netfront_info *info = netdev_priv(dev); |
| unsigned int num_queues = dev->real_num_tx_queues; |
| unsigned int i; |
| |
| if (info->broken) |
| return; |
| |
| for (i = 0; i < num_queues; ++i) |
| xennet_interrupt(0, &info->queues[i]); |
| } |
| #endif |
| |
| static const struct net_device_ops xennet_netdev_ops = { |
| .ndo_open = xennet_open, |
| .ndo_stop = xennet_close, |
| .ndo_start_xmit = xennet_start_xmit, |
| .ndo_change_mtu = xennet_change_mtu, |
| .ndo_get_stats64 = xennet_get_stats64, |
| .ndo_set_mac_address = eth_mac_addr, |
| .ndo_validate_addr = eth_validate_addr, |
| .ndo_fix_features = xennet_fix_features, |
| .ndo_set_features = xennet_set_features, |
| .ndo_select_queue = xennet_select_queue, |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| .ndo_poll_controller = xennet_poll_controller, |
| #endif |
| }; |
| |
| static void xennet_free_netdev(struct net_device *netdev) |
| { |
| struct netfront_info *np = netdev_priv(netdev); |
| |
| free_percpu(np->rx_stats); |
| free_percpu(np->tx_stats); |
| free_netdev(netdev); |
| } |
| |
| static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
| { |
| int err; |
| struct net_device *netdev; |
| struct netfront_info *np; |
| |
| netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); |
| if (!netdev) |
| return ERR_PTR(-ENOMEM); |
| |
| np = netdev_priv(netdev); |
| np->xbdev = dev; |
| |
| np->queues = NULL; |
| |
| err = -ENOMEM; |
| np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
| if (np->rx_stats == NULL) |
| goto exit; |
| np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
| if (np->tx_stats == NULL) |
| goto exit; |
| |
| netdev->netdev_ops = &xennet_netdev_ops; |
| |
| netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
| NETIF_F_GSO_ROBUST; |
| netdev->hw_features = NETIF_F_SG | |
| NETIF_F_IPV6_CSUM | |
| NETIF_F_TSO | NETIF_F_TSO6; |
| |
| /* |
| * Assume that all hw features are available for now. This set |
| * will be adjusted by the call to netdev_update_features() in |
| * xennet_connect() which is the earliest point where we can |
| * negotiate with the backend regarding supported features. |
| */ |
| netdev->features |= netdev->hw_features; |
| |
| netdev->ethtool_ops = &xennet_ethtool_ops; |
| netdev->min_mtu = ETH_MIN_MTU; |
| netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; |
| SET_NETDEV_DEV(netdev, &dev->dev); |
| |
| np->netdev = netdev; |
| |
| netif_carrier_off(netdev); |
| |
| do { |
| xenbus_switch_state(dev, XenbusStateInitialising); |
| err = wait_event_timeout(module_wq, |
| xenbus_read_driver_state(dev->otherend) != |
| XenbusStateClosed && |
| xenbus_read_driver_state(dev->otherend) != |
| XenbusStateUnknown, XENNET_TIMEOUT); |
| } while (!err); |
| |
| return netdev; |
| |
| exit: |
| xennet_free_netdev(netdev); |
| return ERR_PTR(err); |
| } |
| |
| /** |
| * Entry point to this code when a new device is created. Allocate the basic |
| * structures and the ring buffers for communication with the backend, and |
| * inform the backend of the appropriate details for those. |
| */ |
| static int netfront_probe(struct xenbus_device *dev, |
| const struct xenbus_device_id *id) |
| { |
| int err; |
| struct net_device *netdev; |
| struct netfront_info *info; |
| |
| netdev = xennet_create_dev(dev); |
| if (IS_ERR(netdev)) { |
| err = PTR_ERR(netdev); |
| xenbus_dev_fatal(dev, err, "creating netdev"); |
| return err; |
| } |
| |
| info = netdev_priv(netdev); |
| dev_set_drvdata(&dev->dev, info); |
| #ifdef CONFIG_SYSFS |
| info->netdev->sysfs_groups[0] = &xennet_dev_group; |
| #endif |
| |
| return 0; |
| } |
| |
| static void xennet_end_access(int ref, void *page) |
| { |
| /* This frees the page as a side-effect */ |
| if (ref != GRANT_INVALID_REF) |
| gnttab_end_foreign_access(ref, 0, (unsigned long)page); |
| } |
| |
| static void xennet_disconnect_backend(struct netfront_info *info) |
| { |
| unsigned int i = 0; |
| unsigned int num_queues = info->netdev->real_num_tx_queues; |
| |
| netif_carrier_off(info->netdev); |
| |
| for (i = 0; i < num_queues && info->queues; ++i) { |
| struct netfront_queue *queue = &info->queues[i]; |
| |
| del_timer_sync(&queue->rx_refill_timer); |
| |
| if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) |
| unbind_from_irqhandler(queue->tx_irq, queue); |
| if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { |
| unbind_from_irqhandler(queue->tx_irq, queue); |
| unbind_from_irqhandler(queue->rx_irq, queue); |
| } |
| queue->tx_evtchn = queue->rx_evtchn = 0; |
| queue->tx_irq = queue->rx_irq = 0; |
| |
| if (netif_running(info->netdev)) |
| napi_synchronize(&queue->napi); |
| |
| xennet_release_tx_bufs(queue); |
| xennet_release_rx_bufs(queue); |
| gnttab_free_grant_references(queue->gref_tx_head); |
| gnttab_free_grant_references(queue->gref_rx_head); |
| |
| /* End access and free the pages */ |
| xennet_end_access(queue->tx_ring_ref, queue->tx.sring); |
| xennet_end_access(queue->rx_ring_ref, queue->rx.sring); |
| |
| queue->tx_ring_ref = GRANT_INVALID_REF; |
| queue->rx_ring_ref = GRANT_INVALID_REF; |
| queue->tx.sring = NULL; |
| queue->rx.sring = NULL; |
| } |
| } |
| |
| /** |
| * 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(struct xenbus_device *dev) |
| { |
| struct netfront_info *info = dev_get_drvdata(&dev->dev); |
| |
| dev_dbg(&dev->dev, "%s\n", dev->nodename); |
| |
| netif_tx_lock_bh(info->netdev); |
| netif_device_detach(info->netdev); |
| netif_tx_unlock_bh(info->netdev); |
| |
| xennet_disconnect_backend(info); |
| return 0; |
| } |
| |
| 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 int setup_netfront_single(struct netfront_queue *queue) |
| { |
| int err; |
| |
| err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
| if (err < 0) |
| goto fail; |
| |
| err = bind_evtchn_to_irqhandler_lateeoi(queue->tx_evtchn, |
| xennet_interrupt, 0, |
| queue->info->netdev->name, |
| queue); |
| if (err < 0) |
| goto bind_fail; |
| queue->rx_evtchn = queue->tx_evtchn; |
| queue->rx_irq = queue->tx_irq = err; |
| |
| return 0; |
| |
| bind_fail: |
| xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
| queue->tx_evtchn = 0; |
| fail: |
| return err; |
| } |
| |
| static int setup_netfront_split(struct netfront_queue *queue) |
| { |
| int err; |
| |
| err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
| if (err < 0) |
| goto fail; |
| err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); |
| if (err < 0) |
| goto alloc_rx_evtchn_fail; |
| |
| snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), |
| "%s-tx", queue->name); |
| err = bind_evtchn_to_irqhandler_lateeoi(queue->tx_evtchn, |
| xennet_tx_interrupt, 0, |
| queue->tx_irq_name, queue); |
| if (err < 0) |
| goto bind_tx_fail; |
| queue->tx_irq = err; |
| |
| snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), |
| "%s-rx", queue->name); |
| err = bind_evtchn_to_irqhandler_lateeoi(queue->rx_evtchn, |
| xennet_rx_interrupt, 0, |
| queue->rx_irq_name, queue); |
| if (err < 0) |
| goto bind_rx_fail; |
| queue->rx_irq = err; |
| |
| return 0; |
| |
| bind_rx_fail: |
| unbind_from_irqhandler(queue->tx_irq, queue); |
| queue->tx_irq = 0; |
| bind_tx_fail: |
| xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); |
| queue->rx_evtchn = 0; |
| alloc_rx_evtchn_fail: |
| xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
| queue->tx_evtchn = 0; |
| fail: |
| return err; |
| } |
| |
| static int setup_netfront(struct xenbus_device *dev, |
| struct netfront_queue *queue, unsigned int feature_split_evtchn) |
| { |
| struct xen_netif_tx_sring *txs; |
| struct xen_netif_rx_sring *rxs = NULL; |
| grant_ref_t gref; |
| int err; |
| |
| queue->tx_ring_ref = GRANT_INVALID_REF; |
| queue->rx_ring_ref = GRANT_INVALID_REF; |
| queue->rx.sring = NULL; |
| queue->tx.sring = NULL; |
| |
| txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
| if (!txs) { |
| err = -ENOMEM; |
| xenbus_dev_fatal(dev, err, "allocating tx ring page"); |
| goto fail; |
| } |
| SHARED_RING_INIT(txs); |
| FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); |
| |
| err = xenbus_grant_ring(dev, txs, 1, &gref); |
| if (err < 0) |
| goto fail; |
| queue->tx_ring_ref = gref; |
| |
| rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
| if (!rxs) { |
| err = -ENOMEM; |
| xenbus_dev_fatal(dev, err, "allocating rx ring page"); |
| goto fail; |
| } |
| SHARED_RING_INIT(rxs); |
| FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); |
| |
| err = xenbus_grant_ring(dev, rxs, 1, &gref); |
| if (err < 0) |
| goto fail; |
| queue->rx_ring_ref = gref; |
| |
| if (feature_split_evtchn) |
| err = setup_netfront_split(queue); |
| /* setup single event channel if |
| * a) feature-split-event-channels == 0 |
| * b) feature-split-event-channels == 1 but failed to setup |
| */ |
| if (!feature_split_evtchn || (feature_split_evtchn && err)) |
| err = setup_netfront_single(queue); |
| |
| if (err) |
| goto fail; |
| |
| return 0; |
| |
| /* If we fail to setup netfront, it is safe to just revoke access to |
| * granted pages because backend is not accessing it at this point. |
| */ |
| fail: |
| if (queue->rx_ring_ref != GRANT_INVALID_REF) { |
| gnttab_end_foreign_access(queue->rx_ring_ref, 0, |
| (unsigned long)rxs); |
| queue->rx_ring_ref = GRANT_INVALID_REF; |
| } else { |
| free_page((unsigned long)rxs); |
| } |
| if (queue->tx_ring_ref != GRANT_INVALID_REF) { |
| gnttab_end_foreign_access(queue->tx_ring_ref, 0, |
| (unsigned long)txs); |
| queue->tx_ring_ref = GRANT_INVALID_REF; |
| } else { |
| free_page((unsigned long)txs); |
| } |
| return err; |
| } |
| |
| /* Queue-specific initialisation |
| * This used to be done in xennet_create_dev() but must now |
| * be run per-queue. |
| */ |
| static int xennet_init_queue(struct netfront_queue *queue) |
| { |
| unsigned short i; |
| int err = 0; |
| char *devid; |
| |
| spin_lock_init(&queue->tx_lock); |
| spin_lock_init(&queue->rx_lock); |
| spin_lock_init(&queue->rx_cons_lock); |
| |
| setup_timer(&queue->rx_refill_timer, rx_refill_timeout, |
| (unsigned long)queue); |
| |
| devid = strrchr(queue->info->xbdev->nodename, '/') + 1; |
| snprintf(queue->name, sizeof(queue->name), "vif%s-q%u", |
| devid, queue->id); |
| |
| /* Initialise tx_skb_freelist as a free chain containing every entry. */ |
| queue->tx_skb_freelist = 0; |
| queue->tx_pend_queue = TX_LINK_NONE; |
| for (i = 0; i < NET_TX_RING_SIZE; i++) { |
| queue->tx_link[i] = i + 1; |
| queue->grant_tx_ref[i] = GRANT_INVALID_REF; |
| queue->grant_tx_page[i] = NULL; |
| } |
| queue->tx_link[NET_TX_RING_SIZE - 1] = TX_LINK_NONE; |
| |
| /* Clear out rx_skbs */ |
| for (i = 0; i < NET_RX_RING_SIZE; i++) { |
| queue->rx_skbs[i] = NULL; |
| queue->grant_rx_ref[i] = GRANT_INVALID_REF; |
| } |
| |
| /* A grant for every tx ring slot */ |
| if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, |
| &queue->gref_tx_head) < 0) { |
| pr_alert("can't alloc tx grant refs\n"); |
| err = -ENOMEM; |
| goto exit; |
| } |
| |
| /* A grant for every rx ring slot */ |
| if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, |
| &queue->gref_rx_head) < 0) { |
| pr_alert("can't alloc rx grant refs\n"); |
| err = -ENOMEM; |
| goto exit_free_tx; |
| } |
| |
| return 0; |
| |
| exit_free_tx: |
| gnttab_free_grant_references(queue->gref_tx_head); |
| exit: |
| return err; |
| } |
| |
| static int write_queue_xenstore_keys(struct netfront_queue *queue, |
| struct xenbus_transaction *xbt, int write_hierarchical) |
| { |
| /* Write the queue-specific keys into XenStore in the traditional |
| * way for a single queue, or in a queue subkeys for multiple |
| * queues. |
| */ |
| struct xenbus_device *dev = queue->info->xbdev; |
| int err; |
| const char *message; |
| char *path; |
| size_t pathsize; |
| |
| /* Choose the correct place to write the keys */ |
| if (write_hierarchical) { |
| pathsize = strlen(dev->nodename) + 10; |
| path = kzalloc(pathsize, GFP_KERNEL); |
| if (!path) { |
| err = -ENOMEM; |
| message = "out of memory while writing ring references"; |
| goto error; |
| } |
| snprintf(path, pathsize, "%s/queue-%u", |
| dev->nodename, queue->id); |
| } else { |
| path = (char *)dev->nodename; |
| } |
| |
| /* Write ring references */ |
| err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", |
| queue->tx_ring_ref); |
| if (err) { |
| message = "writing tx-ring-ref"; |
| goto error; |
| } |
| |
| err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", |
| queue->rx_ring_ref); |
| if (err) { |
| message = "writing rx-ring-ref"; |
| goto error; |
| } |
| |
| /* Write event channels; taking into account both shared |
| * and split event channel scenarios. |
| */ |
| if (queue->tx_evtchn == queue->rx_evtchn) { |
| /* Shared event channel */ |
| err = xenbus_printf(*xbt, path, |
| "event-channel", "%u", queue->tx_evtchn); |
| if (err) { |
| message = "writing event-channel"; |
| goto error; |
| } |
| } else { |
| /* Split event channels */ |
| err = xenbus_printf(*xbt, path, |
| "event-channel-tx", "%u", queue->tx_evtchn); |
| if (err) { |
| message = "writing event-channel-tx"; |
| goto error; |
| } |
| |
| err = xenbus_printf(*xbt, path, |
| "event-channel-rx", "%u", queue->rx_evtchn); |
| if (err) { |
| message = "writing event-channel-rx"; |
| goto error; |
| } |
| } |
| |
| if (write_hierarchical) |
| kfree(path); |
| return 0; |
| |
| error: |
| if (write_hierarchical) |
| kfree(path); |
| xenbus_dev_fatal(dev, err, "%s", message); |
| return err; |
| } |
| |
| static void xennet_destroy_queues(struct netfront_info *info) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < info->netdev->real_num_tx_queues; i++) { |
| struct netfront_queue *queue = &info->queues[i]; |
| |
| if (netif_running(info->netdev)) |
| napi_disable(&queue->napi); |
| netif_napi_del(&queue->napi); |
| } |
| |
| kfree(info->queues); |
| info->queues = NULL; |
| } |
| |
| static int xennet_create_queues(struct netfront_info *info, |
| unsigned int *num_queues) |
| { |
| unsigned int i; |
| int ret; |
| |
| info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), |
| GFP_KERNEL); |
| if (!info->queues) |
| return -ENOMEM; |
| |
| for (i = 0; i < *num_queues; i++) { |
| struct netfront_queue *queue = &info->queues[i]; |
| |
| queue->id = i; |
| queue->info = info; |
| |
| ret = xennet_init_queue(queue); |
| if (ret < 0) { |
| dev_warn(&info->xbdev->dev, |
| "only created %d queues\n", i); |
| *num_queues = i; |
| break; |
| } |
| |
| netif_napi_add(queue->info->netdev, &queue->napi, |
| xennet_poll, 64); |
| if (netif_running(info->netdev)) |
| napi_enable(&queue->napi); |
| } |
| |
| netif_set_real_num_tx_queues(info->netdev, *num_queues); |
| |
| if (*num_queues == 0) { |
| dev_err(&info->xbdev->dev, "no queues\n"); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| /* Common code used when first setting up, and when resuming. */ |
| static int talk_to_netback(struct xenbus_device *dev, |
| struct netfront_info *info) |
| { |
| const char *message; |
| struct xenbus_transaction xbt; |
| int err; |
| unsigned int feature_split_evtchn; |
| unsigned int i = 0; |
| unsigned int max_queues = 0; |
| struct netfront_queue *queue = NULL; |
| unsigned int num_queues = 1; |
| |
| info->netdev->irq = 0; |
| |
| /* Check if backend supports multiple queues */ |
| max_queues = xenbus_read_unsigned(info->xbdev->otherend, |
| "multi-queue-max-queues", 1); |
| num_queues = min(max_queues, xennet_max_queues); |
| |
| /* Check feature-split-event-channels */ |
| feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, |
| "feature-split-event-channels", 0); |
| |
| /* Read mac addr. */ |
| err = xen_net_read_mac(dev, info->netdev->dev_addr); |
| if (err) { |
| xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); |
| goto out_unlocked; |
| } |
| |
| rtnl_lock(); |
| if (info->queues) |
| xennet_destroy_queues(info); |
| |
| /* For the case of a reconnect reset the "broken" indicator. */ |
| info->broken = false; |
| |
| err = xennet_create_queues(info, &num_queues); |
| if (err < 0) { |
| xenbus_dev_fatal(dev, err, "creating queues"); |
| kfree(info->queues); |
| info->queues = NULL; |
| goto out; |
| } |
| rtnl_unlock(); |
| |
| /* Create shared ring, alloc event channel -- for each queue */ |
| for (i = 0; i < num_queues; ++i) { |
| queue = &info->queues[i]; |
| err = setup_netfront(dev, queue, feature_split_evtchn); |
| if (err) |
| goto destroy_ring; |
| } |
| |
| again: |
| err = xenbus_transaction_start(&xbt); |
| if (err) { |
| xenbus_dev_fatal(dev, err, "starting transaction"); |
| goto destroy_ring; |
| } |
| |
| if (xenbus_exists(XBT_NIL, |
| info->xbdev->otherend, "multi-queue-max-queues")) { |
| /* Write the number of queues */ |
| err = xenbus_printf(xbt, dev->nodename, |
| "multi-queue-num-queues", "%u", num_queues); |
| if (err) { |
| message = "writing multi-queue-num-queues"; |
| goto abort_transaction_no_dev_fatal; |
| } |
| } |
| |
| if (num_queues == 1) { |
| err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ |
| if (err) |
| goto abort_transaction_no_dev_fatal; |
| } else { |
| /* Write the keys for each queue */ |
| for (i = 0; i < num_queues; ++i) { |
| queue = &info->queues[i]; |
| err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ |
| if (err) |
| goto abort_transaction_no_dev_fatal; |
| } |
| } |
| |
| /* The remaining keys are not queue-specific */ |
| err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", |
| 1); |
| if (err) { |
| message = "writing request-rx-copy"; |
| goto abort_transaction; |
| } |
| |
| err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); |
| if (err) { |
| message = "writing feature-rx-notify"; |
| goto abort_transaction; |
| } |
| |
| err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); |
| if (err) { |
| message = "writing feature-sg"; |
| goto abort_transaction; |
| } |
| |
| err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); |
| if (err) { |
| message = "writing feature-gso-tcpv4"; |
| goto abort_transaction; |
| } |
| |
| err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); |
| if (err) { |
| message = "writing feature-gso-tcpv6"; |
| goto abort_transaction; |
| } |
| |
| err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", |
| "1"); |
| if (err) { |
| message = "writing feature-ipv6-csum-offload"; |
| goto abort_transaction; |
| } |
| |
| err = xenbus_transaction_end(xbt, 0); |
| if (err) { |
| if (err == -EAGAIN) |
| goto again; |
| xenbus_dev_fatal(dev, err, "completing transaction"); |
| goto destroy_ring; |
| } |
| |
| return 0; |
| |
| abort_transaction: |
| xenbus_dev_fatal(dev, err, "%s", message); |
| abort_transaction_no_dev_fatal: |
| xenbus_transaction_end(xbt, 1); |
| destroy_ring: |
| xennet_disconnect_backend(info); |
| rtnl_lock(); |
| xennet_destroy_queues(info); |
| out: |
| rtnl_unlock(); |
| out_unlocked: |
| device_unregister(&dev->dev); |
| return err; |
| } |
| |
| static int xennet_connect(struct net_device *dev) |
| { |
| struct netfront_info *np = netdev_priv(dev); |
| unsigned int num_queues = 0; |
| int err; |
| unsigned int j = 0; |
| struct netfront_queue *queue = NULL; |
| |
| if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { |
| dev_info(&dev->dev, |
| "backend does not support copying receive path\n"); |
| return -ENODEV; |
| } |
| |
| err = talk_to_netback(np->xbdev, np); |
| if (err) |
| return err; |
| |
| /* talk_to_netback() sets the correct number of queues */ |
| num_queues = dev->real_num_tx_queues; |
| |
| if (dev->reg_state == NETREG_UNINITIALIZED) { |
| err = register_netdev(dev); |
| if (err) { |
| pr_warn("%s: register_netdev err=%d\n", __func__, err); |
| device_unregister(&np->xbdev->dev); |
| return err; |
| } |
| } |
| |
| rtnl_lock(); |
| netdev_update_features(dev); |
| rtnl_unlock(); |
| |
| /* |
| * 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. |
| */ |
| netif_tx_lock_bh(np->netdev); |
| netif_device_attach(np->netdev); |
| netif_tx_unlock_bh(np->netdev); |
| |
| netif_carrier_on(np->netdev); |
| for (j = 0; j < num_queues; ++j) { |
| queue = &np->queues[j]; |
| |
| notify_remote_via_irq(queue->tx_irq); |
| if (queue->tx_irq != queue->rx_irq) |
| notify_remote_via_irq(queue->rx_irq); |
| |
| spin_lock_irq(&queue->tx_lock); |
| xennet_tx_buf_gc(queue); |
| spin_unlock_irq(&queue->tx_lock); |
| |
| spin_lock_bh(&queue->rx_lock); |
| xennet_alloc_rx_buffers(queue); |
| spin_unlock_bh(&queue->rx_lock); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Callback received when the backend's state changes. |
| */ |
| static void netback_changed(struct xenbus_device *dev, |
| enum xenbus_state backend_state) |
| { |
| struct netfront_info *np = dev_get_drvdata(&dev->dev); |
| struct net_device *netdev = np->netdev; |
| |
| dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); |
| |
| wake_up_all(&module_wq); |
| |
| switch (backend_state) { |
| case XenbusStateInitialising: |
| case XenbusStateInitialised: |
| case XenbusStateReconfiguring: |
| case XenbusStateReconfigured: |
| case XenbusStateUnknown: |
| break; |
| |
| case XenbusStateInitWait: |
| if (dev->state != XenbusStateInitialising) |
| break; |
| if (xennet_connect(netdev) != 0) |
| break; |
| xenbus_switch_state(dev, XenbusStateConnected); |
| break; |
| |
| case XenbusStateConnected: |
| netdev_notify_peers(netdev); |
| break; |
| |
| case XenbusStateClosed: |
| if (dev->state == XenbusStateClosed) |
| break; |
| /* Missed the backend's CLOSING state -- fallthrough */ |
| case XenbusStateClosing: |
| xenbus_frontend_closed(dev); |
| break; |
| } |
| } |
| |
| static const struct xennet_stat { |
| char name[ETH_GSTRING_LEN]; |
| u16 offset; |
| } xennet_stats[] = { |
| { |
| "rx_gso_checksum_fixup", |
| offsetof(struct netfront_info, rx_gso_checksum_fixup) |
| }, |
| }; |
| |
| static int xennet_get_sset_count(struct net_device *dev, int string_set) |
| { |
| switch (string_set) { |
| case ETH_SS_STATS: |
| return ARRAY_SIZE(xennet_stats); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static void xennet_get_ethtool_stats(struct net_device *dev, |
| struct ethtool_stats *stats, u64 * data) |
| { |
| void *np = netdev_priv(dev); |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
| data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); |
| } |
| |
| static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) |
| { |
| int i; |
| |
| switch (stringset) { |
| case ETH_SS_STATS: |
| for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
| memcpy(data + i * ETH_GSTRING_LEN, |
| xennet_stats[i].name, ETH_GSTRING_LEN); |
| break; |
| } |
| } |
| |
| static const struct ethtool_ops xennet_ethtool_ops = |
| { |
| .get_link = ethtool_op_get_link, |
| |
| .get_sset_count = xennet_get_sset_count, |
| .get_ethtool_stats = xennet_get_ethtool_stats, |
| .get_strings = xennet_get_strings, |
| }; |
| |
| #ifdef CONFIG_SYSFS |
| static ssize_t show_rxbuf(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); |
| } |
| |
| static ssize_t store_rxbuf(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| char *endp; |
| unsigned long target; |
| |
| if (!capable(CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| target = simple_strtoul(buf, &endp, 0); |
| if (endp == buf) |
| return -EBADMSG; |
| |
| /* rxbuf_min and rxbuf_max are no longer configurable. */ |
| |
| return len; |
| } |
| |
| static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); |
| static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); |
| static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL); |
| |
| static struct attribute *xennet_dev_attrs[] = { |
| &dev_attr_rxbuf_min.attr, |
| &dev_attr_rxbuf_max.attr, |
| &dev_attr_rxbuf_cur.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group xennet_dev_group = { |
| .attrs = xennet_dev_attrs |
| }; |
| #endif /* CONFIG_SYSFS */ |
| |
| static void xennet_bus_close(struct xenbus_device *dev) |
| { |
| int ret; |
| |
| if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) |
| return; |
| do { |
| xenbus_switch_state(dev, XenbusStateClosing); |
| ret = wait_event_timeout(module_wq, |
| xenbus_read_driver_state(dev->otherend) == |
| XenbusStateClosing || |
| xenbus_read_driver_state(dev->otherend) == |
| XenbusStateClosed || |
| xenbus_read_driver_state(dev->otherend) == |
| XenbusStateUnknown, |
| XENNET_TIMEOUT); |
| } while (!ret); |
| |
| if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) |
| return; |
| |
| do { |
| xenbus_switch_state(dev, XenbusStateClosed); |
| ret = wait_event_timeout(module_wq, |
| xenbus_read_driver_state(dev->otherend) == |
| XenbusStateClosed || |
| xenbus_read_driver_state(dev->otherend) == |
| XenbusStateUnknown, |
| XENNET_TIMEOUT); |
| } while (!ret); |
| } |
| |
| static int xennet_remove(struct xenbus_device *dev) |
| { |
| struct netfront_info *info = dev_get_drvdata(&dev->dev); |
| |
| xennet_bus_close(dev); |
| xennet_disconnect_backend(info); |
| |
| if (info->netdev->reg_state == NETREG_REGISTERED) |
| unregister_netdev(info->netdev); |
| |
| if (info->queues) { |
| rtnl_lock(); |
| xennet_destroy_queues(info); |
| rtnl_unlock(); |
| } |
| xennet_free_netdev(info->netdev); |
| |
| return 0; |
| } |
| |
| static const struct xenbus_device_id netfront_ids[] = { |
| { "vif" }, |
| { "" } |
| }; |
| |
| static struct xenbus_driver netfront_driver = { |
| .ids = netfront_ids, |
| .probe = netfront_probe, |
| .remove = xennet_remove, |
| .resume = netfront_resume, |
| .otherend_changed = netback_changed, |
| }; |
| |
| static int __init netif_init(void) |
| { |
| if (!xen_domain()) |
| return -ENODEV; |
| |
| if (!xen_has_pv_nic_devices()) |
| return -ENODEV; |
| |
| pr_info("Initialising Xen virtual ethernet driver\n"); |
| |
| /* Allow as many queues as there are CPUs inut max. 8 if user has not |
| * specified a value. |
| */ |
| if (xennet_max_queues == 0) |
| xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, |
| num_online_cpus()); |
| |
| return xenbus_register_frontend(&netfront_driver); |
| } |
| module_init(netif_init); |
| |
| |
| static void __exit netif_exit(void) |
| { |
| xenbus_unregister_driver(&netfront_driver); |
| } |
| module_exit(netif_exit); |
| |
| MODULE_DESCRIPTION("Xen virtual network device frontend"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("xen:vif"); |
| MODULE_ALIAS("xennet"); |