1296f96fcSRusty Russell /* A simple network driver using virtio. 2296f96fcSRusty Russell * 3296f96fcSRusty Russell * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation 4296f96fcSRusty Russell * 5296f96fcSRusty Russell * This program is free software; you can redistribute it and/or modify 6296f96fcSRusty Russell * it under the terms of the GNU General Public License as published by 7296f96fcSRusty Russell * the Free Software Foundation; either version 2 of the License, or 8296f96fcSRusty Russell * (at your option) any later version. 9296f96fcSRusty Russell * 10296f96fcSRusty Russell * This program is distributed in the hope that it will be useful, 11296f96fcSRusty Russell * but WITHOUT ANY WARRANTY; without even the implied warranty of 12296f96fcSRusty Russell * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13296f96fcSRusty Russell * GNU General Public License for more details. 14296f96fcSRusty Russell * 15296f96fcSRusty Russell * You should have received a copy of the GNU General Public License 16296f96fcSRusty Russell * along with this program; if not, write to the Free Software 17296f96fcSRusty Russell * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18296f96fcSRusty Russell */ 19296f96fcSRusty Russell //#define DEBUG 20296f96fcSRusty Russell #include <linux/netdevice.h> 21296f96fcSRusty Russell #include <linux/etherdevice.h> 22a9ea3fc6SHerbert Xu #include <linux/ethtool.h> 23296f96fcSRusty Russell #include <linux/module.h> 24296f96fcSRusty Russell #include <linux/virtio.h> 253ca4f5caSFernando Luis Vazquez Cao #include <linux/virtio_ids.h> 26296f96fcSRusty Russell #include <linux/virtio_net.h> 27296f96fcSRusty Russell #include <linux/scatterlist.h> 28e918085aSAlex Williamson #include <linux/if_vlan.h> 29296f96fcSRusty Russell 306c0cd7c0SDor Laor static int napi_weight = 128; 316c0cd7c0SDor Laor module_param(napi_weight, int, 0444); 326c0cd7c0SDor Laor 3334a48579SRusty Russell static int csum = 1, gso = 1; 3434a48579SRusty Russell module_param(csum, bool, 0444); 3534a48579SRusty Russell module_param(gso, bool, 0444); 3634a48579SRusty Russell 37296f96fcSRusty Russell /* FIXME: MTU in config. */ 38e918085aSAlex Williamson #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) 393f2c31d9SMark McLoughlin #define GOOD_COPY_LEN 128 40296f96fcSRusty Russell 41f565a7c2SAlex Williamson #define VIRTNET_SEND_COMMAND_SG_MAX 2 422a41f71dSAlex Williamson 43296f96fcSRusty Russell struct virtnet_info 44296f96fcSRusty Russell { 45296f96fcSRusty Russell struct virtio_device *vdev; 462a41f71dSAlex Williamson struct virtqueue *rvq, *svq, *cvq; 47296f96fcSRusty Russell struct net_device *dev; 48296f96fcSRusty Russell struct napi_struct napi; 499f4d26d0SMark McLoughlin unsigned int status; 50296f96fcSRusty Russell 51363f1514SRusty Russell /* If we need to free in a timer, this is it. */ 5214c998f0SMark McLoughlin struct timer_list xmit_free_timer; 5314c998f0SMark McLoughlin 54296f96fcSRusty Russell /* Number of input buffers, and max we've ever had. */ 55296f96fcSRusty Russell unsigned int num, max; 56296f96fcSRusty Russell 5711a3a154SRusty Russell /* For cleaning up after transmission. */ 5811a3a154SRusty Russell struct tasklet_struct tasklet; 59363f1514SRusty Russell bool free_in_tasklet; 6011a3a154SRusty Russell 6197402b96SHerbert Xu /* I like... big packets and I cannot lie! */ 6297402b96SHerbert Xu bool big_packets; 6397402b96SHerbert Xu 643f2c31d9SMark McLoughlin /* Host will merge rx buffers for big packets (shake it! shake it!) */ 653f2c31d9SMark McLoughlin bool mergeable_rx_bufs; 663f2c31d9SMark McLoughlin 67296f96fcSRusty Russell /* Receive & send queues. */ 68296f96fcSRusty Russell struct sk_buff_head recv; 69296f96fcSRusty Russell struct sk_buff_head send; 70fb6813f4SRusty Russell 713161e453SRusty Russell /* Work struct for refilling if we run low on memory. */ 723161e453SRusty Russell struct delayed_work refill; 733161e453SRusty Russell 74fb6813f4SRusty Russell /* Chain pages by the private ptr. */ 75fb6813f4SRusty Russell struct page *pages; 76296f96fcSRusty Russell }; 77296f96fcSRusty Russell 783f2c31d9SMark McLoughlin static inline void *skb_vnet_hdr(struct sk_buff *skb) 79296f96fcSRusty Russell { 80296f96fcSRusty Russell return (struct virtio_net_hdr *)skb->cb; 81296f96fcSRusty Russell } 82296f96fcSRusty Russell 83fb6813f4SRusty Russell static void give_a_page(struct virtnet_info *vi, struct page *page) 84fb6813f4SRusty Russell { 85fb6813f4SRusty Russell page->private = (unsigned long)vi->pages; 86fb6813f4SRusty Russell vi->pages = page; 87fb6813f4SRusty Russell } 88fb6813f4SRusty Russell 890a888fd1SMark McLoughlin static void trim_pages(struct virtnet_info *vi, struct sk_buff *skb) 900a888fd1SMark McLoughlin { 910a888fd1SMark McLoughlin unsigned int i; 920a888fd1SMark McLoughlin 930a888fd1SMark McLoughlin for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) 940a888fd1SMark McLoughlin give_a_page(vi, skb_shinfo(skb)->frags[i].page); 950a888fd1SMark McLoughlin skb_shinfo(skb)->nr_frags = 0; 960a888fd1SMark McLoughlin skb->data_len = 0; 970a888fd1SMark McLoughlin } 980a888fd1SMark McLoughlin 99fb6813f4SRusty Russell static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) 100fb6813f4SRusty Russell { 101fb6813f4SRusty Russell struct page *p = vi->pages; 102fb6813f4SRusty Russell 103fb6813f4SRusty Russell if (p) 104fb6813f4SRusty Russell vi->pages = (struct page *)p->private; 105fb6813f4SRusty Russell else 106fb6813f4SRusty Russell p = alloc_page(gfp_mask); 107fb6813f4SRusty Russell return p; 108fb6813f4SRusty Russell } 109fb6813f4SRusty Russell 1102cb9c6baSRusty Russell static void skb_xmit_done(struct virtqueue *svq) 111296f96fcSRusty Russell { 1122cb9c6baSRusty Russell struct virtnet_info *vi = svq->vdev->priv; 113296f96fcSRusty Russell 1142cb9c6baSRusty Russell /* Suppress further interrupts. */ 1152cb9c6baSRusty Russell svq->vq_ops->disable_cb(svq); 11611a3a154SRusty Russell 117363f1514SRusty Russell /* We were probably waiting for more output buffers. */ 118296f96fcSRusty Russell netif_wake_queue(vi->dev); 11911a3a154SRusty Russell 1208958f574SRusty Russell if (vi->free_in_tasklet) 12111a3a154SRusty Russell tasklet_schedule(&vi->tasklet); 122296f96fcSRusty Russell } 123296f96fcSRusty Russell 124296f96fcSRusty Russell static void receive_skb(struct net_device *dev, struct sk_buff *skb, 125296f96fcSRusty Russell unsigned len) 126296f96fcSRusty Russell { 1273f2c31d9SMark McLoughlin struct virtnet_info *vi = netdev_priv(dev); 128296f96fcSRusty Russell struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); 12997402b96SHerbert Xu int err; 1303f2c31d9SMark McLoughlin int i; 131296f96fcSRusty Russell 132296f96fcSRusty Russell if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { 133296f96fcSRusty Russell pr_debug("%s: short packet %i\n", dev->name, len); 134296f96fcSRusty Russell dev->stats.rx_length_errors++; 135296f96fcSRusty Russell goto drop; 136296f96fcSRusty Russell } 1373f2c31d9SMark McLoughlin 1383f2c31d9SMark McLoughlin if (vi->mergeable_rx_bufs) { 1393f2c31d9SMark McLoughlin struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); 1403f2c31d9SMark McLoughlin unsigned int copy; 1413f2c31d9SMark McLoughlin char *p = page_address(skb_shinfo(skb)->frags[0].page); 1423f2c31d9SMark McLoughlin 1433f2c31d9SMark McLoughlin if (len > PAGE_SIZE) 1443f2c31d9SMark McLoughlin len = PAGE_SIZE; 1453f2c31d9SMark McLoughlin len -= sizeof(struct virtio_net_hdr_mrg_rxbuf); 1463f2c31d9SMark McLoughlin 1473f2c31d9SMark McLoughlin memcpy(hdr, p, sizeof(*mhdr)); 1483f2c31d9SMark McLoughlin p += sizeof(*mhdr); 1493f2c31d9SMark McLoughlin 1503f2c31d9SMark McLoughlin copy = len; 1513f2c31d9SMark McLoughlin if (copy > skb_tailroom(skb)) 1523f2c31d9SMark McLoughlin copy = skb_tailroom(skb); 1533f2c31d9SMark McLoughlin 1543f2c31d9SMark McLoughlin memcpy(skb_put(skb, copy), p, copy); 1553f2c31d9SMark McLoughlin 1563f2c31d9SMark McLoughlin len -= copy; 1573f2c31d9SMark McLoughlin 1583f2c31d9SMark McLoughlin if (!len) { 1593f2c31d9SMark McLoughlin give_a_page(vi, skb_shinfo(skb)->frags[0].page); 1603f2c31d9SMark McLoughlin skb_shinfo(skb)->nr_frags--; 1613f2c31d9SMark McLoughlin } else { 1623f2c31d9SMark McLoughlin skb_shinfo(skb)->frags[0].page_offset += 1633f2c31d9SMark McLoughlin sizeof(*mhdr) + copy; 1643f2c31d9SMark McLoughlin skb_shinfo(skb)->frags[0].size = len; 1653f2c31d9SMark McLoughlin skb->data_len += len; 1663f2c31d9SMark McLoughlin skb->len += len; 1673f2c31d9SMark McLoughlin } 1683f2c31d9SMark McLoughlin 1693f2c31d9SMark McLoughlin while (--mhdr->num_buffers) { 1703f2c31d9SMark McLoughlin struct sk_buff *nskb; 1713f2c31d9SMark McLoughlin 1723f2c31d9SMark McLoughlin i = skb_shinfo(skb)->nr_frags; 1733f2c31d9SMark McLoughlin if (i >= MAX_SKB_FRAGS) { 1743f2c31d9SMark McLoughlin pr_debug("%s: packet too long %d\n", dev->name, 1753f2c31d9SMark McLoughlin len); 1763f2c31d9SMark McLoughlin dev->stats.rx_length_errors++; 1773f2c31d9SMark McLoughlin goto drop; 1783f2c31d9SMark McLoughlin } 1793f2c31d9SMark McLoughlin 1803f2c31d9SMark McLoughlin nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len); 1813f2c31d9SMark McLoughlin if (!nskb) { 1823f2c31d9SMark McLoughlin pr_debug("%s: rx error: %d buffers missing\n", 1833f2c31d9SMark McLoughlin dev->name, mhdr->num_buffers); 1843f2c31d9SMark McLoughlin dev->stats.rx_length_errors++; 1853f2c31d9SMark McLoughlin goto drop; 1863f2c31d9SMark McLoughlin } 1873f2c31d9SMark McLoughlin 1883f2c31d9SMark McLoughlin __skb_unlink(nskb, &vi->recv); 1893f2c31d9SMark McLoughlin vi->num--; 1903f2c31d9SMark McLoughlin 1913f2c31d9SMark McLoughlin skb_shinfo(skb)->frags[i] = skb_shinfo(nskb)->frags[0]; 1923f2c31d9SMark McLoughlin skb_shinfo(nskb)->nr_frags = 0; 1933f2c31d9SMark McLoughlin kfree_skb(nskb); 1943f2c31d9SMark McLoughlin 1953f2c31d9SMark McLoughlin if (len > PAGE_SIZE) 1963f2c31d9SMark McLoughlin len = PAGE_SIZE; 1973f2c31d9SMark McLoughlin 1983f2c31d9SMark McLoughlin skb_shinfo(skb)->frags[i].size = len; 1993f2c31d9SMark McLoughlin skb_shinfo(skb)->nr_frags++; 2003f2c31d9SMark McLoughlin skb->data_len += len; 2013f2c31d9SMark McLoughlin skb->len += len; 2023f2c31d9SMark McLoughlin } 2033f2c31d9SMark McLoughlin } else { 204296f96fcSRusty Russell len -= sizeof(struct virtio_net_hdr); 205296f96fcSRusty Russell 2060a888fd1SMark McLoughlin if (len <= MAX_PACKET_LEN) 2073f2c31d9SMark McLoughlin trim_pages(vi, skb); 208fb6813f4SRusty Russell 20997402b96SHerbert Xu err = pskb_trim(skb, len); 21097402b96SHerbert Xu if (err) { 2113f2c31d9SMark McLoughlin pr_debug("%s: pskb_trim failed %i %d\n", dev->name, 2123f2c31d9SMark McLoughlin len, err); 21397402b96SHerbert Xu dev->stats.rx_dropped++; 21497402b96SHerbert Xu goto drop; 21597402b96SHerbert Xu } 2163f2c31d9SMark McLoughlin } 2173f2c31d9SMark McLoughlin 21897402b96SHerbert Xu skb->truesize += skb->data_len; 219296f96fcSRusty Russell dev->stats.rx_bytes += skb->len; 220296f96fcSRusty Russell dev->stats.rx_packets++; 221296f96fcSRusty Russell 222296f96fcSRusty Russell if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 223296f96fcSRusty Russell pr_debug("Needs csum!\n"); 224f35d9d8aSRusty Russell if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) 225296f96fcSRusty Russell goto frame_err; 226296f96fcSRusty Russell } 227296f96fcSRusty Russell 22823cde76dSMark McLoughlin skb->protocol = eth_type_trans(skb, dev); 22923cde76dSMark McLoughlin pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 23023cde76dSMark McLoughlin ntohs(skb->protocol), skb->len, skb->pkt_type); 23123cde76dSMark McLoughlin 232296f96fcSRusty Russell if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { 233296f96fcSRusty Russell pr_debug("GSO!\n"); 23434a48579SRusty Russell switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 235296f96fcSRusty Russell case VIRTIO_NET_HDR_GSO_TCPV4: 236296f96fcSRusty Russell skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 237296f96fcSRusty Russell break; 238296f96fcSRusty Russell case VIRTIO_NET_HDR_GSO_UDP: 239296f96fcSRusty Russell skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 240296f96fcSRusty Russell break; 241296f96fcSRusty Russell case VIRTIO_NET_HDR_GSO_TCPV6: 242296f96fcSRusty Russell skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 243296f96fcSRusty Russell break; 244296f96fcSRusty Russell default: 245296f96fcSRusty Russell if (net_ratelimit()) 246296f96fcSRusty Russell printk(KERN_WARNING "%s: bad gso type %u.\n", 247296f96fcSRusty Russell dev->name, hdr->gso_type); 248296f96fcSRusty Russell goto frame_err; 249296f96fcSRusty Russell } 250296f96fcSRusty Russell 25134a48579SRusty Russell if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) 25234a48579SRusty Russell skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 25334a48579SRusty Russell 254296f96fcSRusty Russell skb_shinfo(skb)->gso_size = hdr->gso_size; 255296f96fcSRusty Russell if (skb_shinfo(skb)->gso_size == 0) { 256296f96fcSRusty Russell if (net_ratelimit()) 257296f96fcSRusty Russell printk(KERN_WARNING "%s: zero gso size.\n", 258296f96fcSRusty Russell dev->name); 259296f96fcSRusty Russell goto frame_err; 260296f96fcSRusty Russell } 261296f96fcSRusty Russell 262296f96fcSRusty Russell /* Header must be checked, and gso_segs computed. */ 263296f96fcSRusty Russell skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 264296f96fcSRusty Russell skb_shinfo(skb)->gso_segs = 0; 265296f96fcSRusty Russell } 266296f96fcSRusty Russell 267296f96fcSRusty Russell netif_receive_skb(skb); 268296f96fcSRusty Russell return; 269296f96fcSRusty Russell 270296f96fcSRusty Russell frame_err: 271296f96fcSRusty Russell dev->stats.rx_frame_errors++; 272296f96fcSRusty Russell drop: 273296f96fcSRusty Russell dev_kfree_skb(skb); 274296f96fcSRusty Russell } 275296f96fcSRusty Russell 2763161e453SRusty Russell static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp) 277296f96fcSRusty Russell { 278296f96fcSRusty Russell struct sk_buff *skb; 27905271685SRusty Russell struct scatterlist sg[2+MAX_SKB_FRAGS]; 28097402b96SHerbert Xu int num, err, i; 2813161e453SRusty Russell bool oom = false; 282296f96fcSRusty Russell 28305271685SRusty Russell sg_init_table(sg, 2+MAX_SKB_FRAGS); 284296f96fcSRusty Russell for (;;) { 2853f2c31d9SMark McLoughlin struct virtio_net_hdr *hdr; 2863f2c31d9SMark McLoughlin 2878981f010SHerbert Xu skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN + NET_IP_ALIGN); 2883161e453SRusty Russell if (unlikely(!skb)) { 2893161e453SRusty Russell oom = true; 290296f96fcSRusty Russell break; 2913161e453SRusty Russell } 292296f96fcSRusty Russell 2938981f010SHerbert Xu skb_reserve(skb, NET_IP_ALIGN); 294296f96fcSRusty Russell skb_put(skb, MAX_PACKET_LEN); 2953f2c31d9SMark McLoughlin 2963f2c31d9SMark McLoughlin hdr = skb_vnet_hdr(skb); 2978527bec5SIra W. Snyder sg_set_buf(sg, hdr, sizeof(*hdr)); 29897402b96SHerbert Xu 29997402b96SHerbert Xu if (vi->big_packets) { 30097402b96SHerbert Xu for (i = 0; i < MAX_SKB_FRAGS; i++) { 30197402b96SHerbert Xu skb_frag_t *f = &skb_shinfo(skb)->frags[i]; 3023161e453SRusty Russell f->page = get_a_page(vi, gfp); 30397402b96SHerbert Xu if (!f->page) 30497402b96SHerbert Xu break; 30597402b96SHerbert Xu 30697402b96SHerbert Xu f->page_offset = 0; 30797402b96SHerbert Xu f->size = PAGE_SIZE; 30897402b96SHerbert Xu 30997402b96SHerbert Xu skb->data_len += PAGE_SIZE; 31097402b96SHerbert Xu skb->len += PAGE_SIZE; 31197402b96SHerbert Xu 31297402b96SHerbert Xu skb_shinfo(skb)->nr_frags++; 31397402b96SHerbert Xu } 31497402b96SHerbert Xu } 31597402b96SHerbert Xu 316296f96fcSRusty Russell num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; 317296f96fcSRusty Russell skb_queue_head(&vi->recv, skb); 318296f96fcSRusty Russell 319296f96fcSRusty Russell err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); 3203c1b27d5SRusty Russell if (err < 0) { 321296f96fcSRusty Russell skb_unlink(skb, &vi->recv); 3220a888fd1SMark McLoughlin trim_pages(vi, skb); 323296f96fcSRusty Russell kfree_skb(skb); 324296f96fcSRusty Russell break; 325296f96fcSRusty Russell } 326296f96fcSRusty Russell vi->num++; 327296f96fcSRusty Russell } 328296f96fcSRusty Russell if (unlikely(vi->num > vi->max)) 329296f96fcSRusty Russell vi->max = vi->num; 330296f96fcSRusty Russell vi->rvq->vq_ops->kick(vi->rvq); 3313161e453SRusty Russell return !oom; 332296f96fcSRusty Russell } 333296f96fcSRusty Russell 3343161e453SRusty Russell /* Returns false if we couldn't fill entirely (OOM). */ 3353161e453SRusty Russell static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) 3363f2c31d9SMark McLoughlin { 3373f2c31d9SMark McLoughlin struct sk_buff *skb; 3383f2c31d9SMark McLoughlin struct scatterlist sg[1]; 3393f2c31d9SMark McLoughlin int err; 3403161e453SRusty Russell bool oom = false; 3413f2c31d9SMark McLoughlin 3423161e453SRusty Russell if (!vi->mergeable_rx_bufs) 3433161e453SRusty Russell return try_fill_recv_maxbufs(vi, gfp); 3443f2c31d9SMark McLoughlin 3453f2c31d9SMark McLoughlin for (;;) { 3463f2c31d9SMark McLoughlin skb_frag_t *f; 3473f2c31d9SMark McLoughlin 3483f2c31d9SMark McLoughlin skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN); 3493161e453SRusty Russell if (unlikely(!skb)) { 3503161e453SRusty Russell oom = true; 3513f2c31d9SMark McLoughlin break; 3523161e453SRusty Russell } 3533f2c31d9SMark McLoughlin 3543f2c31d9SMark McLoughlin skb_reserve(skb, NET_IP_ALIGN); 3553f2c31d9SMark McLoughlin 3563f2c31d9SMark McLoughlin f = &skb_shinfo(skb)->frags[0]; 3573161e453SRusty Russell f->page = get_a_page(vi, gfp); 3583f2c31d9SMark McLoughlin if (!f->page) { 3593161e453SRusty Russell oom = true; 3603f2c31d9SMark McLoughlin kfree_skb(skb); 3613f2c31d9SMark McLoughlin break; 3623f2c31d9SMark McLoughlin } 3633f2c31d9SMark McLoughlin 3643f2c31d9SMark McLoughlin f->page_offset = 0; 3653f2c31d9SMark McLoughlin f->size = PAGE_SIZE; 3663f2c31d9SMark McLoughlin 3673f2c31d9SMark McLoughlin skb_shinfo(skb)->nr_frags++; 3683f2c31d9SMark McLoughlin 3693f2c31d9SMark McLoughlin sg_init_one(sg, page_address(f->page), PAGE_SIZE); 3703f2c31d9SMark McLoughlin skb_queue_head(&vi->recv, skb); 3713f2c31d9SMark McLoughlin 3723f2c31d9SMark McLoughlin err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb); 3733c1b27d5SRusty Russell if (err < 0) { 3743f2c31d9SMark McLoughlin skb_unlink(skb, &vi->recv); 3753f2c31d9SMark McLoughlin kfree_skb(skb); 3763f2c31d9SMark McLoughlin break; 3773f2c31d9SMark McLoughlin } 3783f2c31d9SMark McLoughlin vi->num++; 3793f2c31d9SMark McLoughlin } 3803f2c31d9SMark McLoughlin if (unlikely(vi->num > vi->max)) 3813f2c31d9SMark McLoughlin vi->max = vi->num; 3823f2c31d9SMark McLoughlin vi->rvq->vq_ops->kick(vi->rvq); 3833161e453SRusty Russell return !oom; 3843f2c31d9SMark McLoughlin } 3853f2c31d9SMark McLoughlin 38618445c4dSRusty Russell static void skb_recv_done(struct virtqueue *rvq) 387296f96fcSRusty Russell { 388296f96fcSRusty Russell struct virtnet_info *vi = rvq->vdev->priv; 38918445c4dSRusty Russell /* Schedule NAPI, Suppress further interrupts if successful. */ 390288379f0SBen Hutchings if (napi_schedule_prep(&vi->napi)) { 39118445c4dSRusty Russell rvq->vq_ops->disable_cb(rvq); 392288379f0SBen Hutchings __napi_schedule(&vi->napi); 39318445c4dSRusty Russell } 394296f96fcSRusty Russell } 395296f96fcSRusty Russell 3963161e453SRusty Russell static void refill_work(struct work_struct *work) 3973161e453SRusty Russell { 3983161e453SRusty Russell struct virtnet_info *vi; 3993161e453SRusty Russell bool still_empty; 4003161e453SRusty Russell 4013161e453SRusty Russell vi = container_of(work, struct virtnet_info, refill.work); 4023161e453SRusty Russell napi_disable(&vi->napi); 4033161e453SRusty Russell try_fill_recv(vi, GFP_KERNEL); 4043161e453SRusty Russell still_empty = (vi->num == 0); 4053161e453SRusty Russell napi_enable(&vi->napi); 4063161e453SRusty Russell 4073161e453SRusty Russell /* In theory, this can happen: if we don't get any buffers in 4083161e453SRusty Russell * we will *never* try to fill again. */ 4093161e453SRusty Russell if (still_empty) 4103161e453SRusty Russell schedule_delayed_work(&vi->refill, HZ/2); 4113161e453SRusty Russell } 4123161e453SRusty Russell 413296f96fcSRusty Russell static int virtnet_poll(struct napi_struct *napi, int budget) 414296f96fcSRusty Russell { 415296f96fcSRusty Russell struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); 416296f96fcSRusty Russell struct sk_buff *skb = NULL; 417296f96fcSRusty Russell unsigned int len, received = 0; 418296f96fcSRusty Russell 419296f96fcSRusty Russell again: 420296f96fcSRusty Russell while (received < budget && 421296f96fcSRusty Russell (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { 422296f96fcSRusty Russell __skb_unlink(skb, &vi->recv); 423296f96fcSRusty Russell receive_skb(vi->dev, skb, len); 424296f96fcSRusty Russell vi->num--; 425296f96fcSRusty Russell received++; 426296f96fcSRusty Russell } 427296f96fcSRusty Russell 4283161e453SRusty Russell if (vi->num < vi->max / 2) { 4293161e453SRusty Russell if (!try_fill_recv(vi, GFP_ATOMIC)) 4303161e453SRusty Russell schedule_delayed_work(&vi->refill, 0); 4313161e453SRusty Russell } 432296f96fcSRusty Russell 4338329d98eSRusty Russell /* Out of packets? */ 4348329d98eSRusty Russell if (received < budget) { 435288379f0SBen Hutchings napi_complete(napi); 43618445c4dSRusty Russell if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) 4374265f161SChristian Borntraeger && napi_schedule_prep(napi)) { 4384265f161SChristian Borntraeger vi->rvq->vq_ops->disable_cb(vi->rvq); 439288379f0SBen Hutchings __napi_schedule(napi); 440296f96fcSRusty Russell goto again; 441296f96fcSRusty Russell } 4424265f161SChristian Borntraeger } 443296f96fcSRusty Russell 444296f96fcSRusty Russell return received; 445296f96fcSRusty Russell } 446296f96fcSRusty Russell 447296f96fcSRusty Russell static void free_old_xmit_skbs(struct virtnet_info *vi) 448296f96fcSRusty Russell { 449296f96fcSRusty Russell struct sk_buff *skb; 450296f96fcSRusty Russell unsigned int len; 451296f96fcSRusty Russell 452296f96fcSRusty Russell while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { 453296f96fcSRusty Russell pr_debug("Sent skb %p\n", skb); 454296f96fcSRusty Russell __skb_unlink(skb, &vi->send); 455655aa31fSRusty Russell vi->dev->stats.tx_bytes += skb->len; 456296f96fcSRusty Russell vi->dev->stats.tx_packets++; 457296f96fcSRusty Russell kfree_skb(skb); 458296f96fcSRusty Russell } 459296f96fcSRusty Russell } 460296f96fcSRusty Russell 461363f1514SRusty Russell /* If the virtio transport doesn't always notify us when all in-flight packets 462363f1514SRusty Russell * are consumed, we fall back to using this function on a timer to free them. */ 46314c998f0SMark McLoughlin static void xmit_free(unsigned long data) 46414c998f0SMark McLoughlin { 46514c998f0SMark McLoughlin struct virtnet_info *vi = (void *)data; 46614c998f0SMark McLoughlin 46714c998f0SMark McLoughlin netif_tx_lock(vi->dev); 46814c998f0SMark McLoughlin 46914c998f0SMark McLoughlin free_old_xmit_skbs(vi); 47014c998f0SMark McLoughlin 47114c998f0SMark McLoughlin if (!skb_queue_empty(&vi->send)) 47214c998f0SMark McLoughlin mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); 47314c998f0SMark McLoughlin 47414c998f0SMark McLoughlin netif_tx_unlock(vi->dev); 47514c998f0SMark McLoughlin } 47614c998f0SMark McLoughlin 47799ffc696SRusty Russell static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) 478296f96fcSRusty Russell { 47914c998f0SMark McLoughlin int num, err; 48005271685SRusty Russell struct scatterlist sg[2+MAX_SKB_FRAGS]; 4813f2c31d9SMark McLoughlin struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); 4823f2c31d9SMark McLoughlin struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); 483296f96fcSRusty Russell const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 484296f96fcSRusty Russell 48505271685SRusty Russell sg_init_table(sg, 2+MAX_SKB_FRAGS); 4864d125de3SRusty Russell 487e174961cSJohannes Berg pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 488296f96fcSRusty Russell 489296f96fcSRusty Russell if (skb->ip_summed == CHECKSUM_PARTIAL) { 490296f96fcSRusty Russell hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 491296f96fcSRusty Russell hdr->csum_start = skb->csum_start - skb_headroom(skb); 492296f96fcSRusty Russell hdr->csum_offset = skb->csum_offset; 493296f96fcSRusty Russell } else { 494296f96fcSRusty Russell hdr->flags = 0; 495296f96fcSRusty Russell hdr->csum_offset = hdr->csum_start = 0; 496296f96fcSRusty Russell } 497296f96fcSRusty Russell 498296f96fcSRusty Russell if (skb_is_gso(skb)) { 499b82f08eaSHerbert Xu hdr->hdr_len = skb_headlen(skb); 500296f96fcSRusty Russell hdr->gso_size = skb_shinfo(skb)->gso_size; 50134a48579SRusty Russell if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 502296f96fcSRusty Russell hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 503296f96fcSRusty Russell else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 504296f96fcSRusty Russell hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 505296f96fcSRusty Russell else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 506296f96fcSRusty Russell hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; 507296f96fcSRusty Russell else 508296f96fcSRusty Russell BUG(); 50934a48579SRusty Russell if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 51034a48579SRusty Russell hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 511296f96fcSRusty Russell } else { 512296f96fcSRusty Russell hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; 51350c8ea80SRusty Russell hdr->gso_size = hdr->hdr_len = 0; 514296f96fcSRusty Russell } 515296f96fcSRusty Russell 5163f2c31d9SMark McLoughlin mhdr->num_buffers = 0; 5173f2c31d9SMark McLoughlin 5183f2c31d9SMark McLoughlin /* Encode metadata header at front. */ 5193f2c31d9SMark McLoughlin if (vi->mergeable_rx_bufs) 5208527bec5SIra W. Snyder sg_set_buf(sg, mhdr, sizeof(*mhdr)); 5213f2c31d9SMark McLoughlin else 5228527bec5SIra W. Snyder sg_set_buf(sg, hdr, sizeof(*hdr)); 5233f2c31d9SMark McLoughlin 524296f96fcSRusty Russell num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; 52599ffc696SRusty Russell 52614c998f0SMark McLoughlin err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); 5272b5bbe3bSRusty Russell if (err >= 0 && !vi->free_in_tasklet) { 5282b5bbe3bSRusty Russell /* Don't wait up for transmitted skbs to be freed. */ 5292b5bbe3bSRusty Russell skb_orphan(skb); 5302b5bbe3bSRusty Russell nf_reset(skb); 53114c998f0SMark McLoughlin mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); 5322b5bbe3bSRusty Russell } 53314c998f0SMark McLoughlin 53414c998f0SMark McLoughlin return err; 53599ffc696SRusty Russell } 53699ffc696SRusty Russell 53711a3a154SRusty Russell static void xmit_tasklet(unsigned long data) 53811a3a154SRusty Russell { 53911a3a154SRusty Russell struct virtnet_info *vi = (void *)data; 54011a3a154SRusty Russell 54111a3a154SRusty Russell netif_tx_lock_bh(vi->dev); 542363f1514SRusty Russell free_old_xmit_skbs(vi); 54311a3a154SRusty Russell netif_tx_unlock_bh(vi->dev); 54411a3a154SRusty Russell } 54511a3a154SRusty Russell 546424efe9cSStephen Hemminger static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 54799ffc696SRusty Russell { 54899ffc696SRusty Russell struct virtnet_info *vi = netdev_priv(dev); 5492cb9c6baSRusty Russell 5502cb9c6baSRusty Russell again: 5512cb9c6baSRusty Russell /* Free up any pending old buffers before queueing new ones. */ 5522cb9c6baSRusty Russell free_old_xmit_skbs(vi); 55399ffc696SRusty Russell 55499ffc696SRusty Russell /* Put new one in send queue and do transmit */ 55599ffc696SRusty Russell __skb_queue_head(&vi->send, skb); 5568958f574SRusty Russell if (likely(xmit_skb(vi, skb) >= 0)) { 55799ffc696SRusty Russell vi->svq->vq_ops->kick(vi->svq); 55899ffc696SRusty Russell return NETDEV_TX_OK; 5598958f574SRusty Russell } 56099ffc696SRusty Russell 5618958f574SRusty Russell /* Ring too full for this packet, remove it from queue again. */ 562296f96fcSRusty Russell pr_debug("%s: virtio not prepared to send\n", dev->name); 5638958f574SRusty Russell __skb_unlink(skb, &vi->send); 564296f96fcSRusty Russell netif_stop_queue(dev); 5652cb9c6baSRusty Russell 5664265f161SChristian Borntraeger /* Activate callback for using skbs: if this returns false it 5672cb9c6baSRusty Russell * means some were used in the meantime. */ 5682cb9c6baSRusty Russell if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { 5694265f161SChristian Borntraeger vi->svq->vq_ops->disable_cb(vi->svq); 5702cb9c6baSRusty Russell netif_start_queue(dev); 5712cb9c6baSRusty Russell goto again; 5722cb9c6baSRusty Russell } 5738958f574SRusty Russell return NETDEV_TX_BUSY; 574296f96fcSRusty Russell } 575296f96fcSRusty Russell 5769c46f6d4SAlex Williamson static int virtnet_set_mac_address(struct net_device *dev, void *p) 5779c46f6d4SAlex Williamson { 5789c46f6d4SAlex Williamson struct virtnet_info *vi = netdev_priv(dev); 5799c46f6d4SAlex Williamson struct virtio_device *vdev = vi->vdev; 5809c46f6d4SAlex Williamson int ret; 5819c46f6d4SAlex Williamson 5829c46f6d4SAlex Williamson ret = eth_mac_addr(dev, p); 5839c46f6d4SAlex Williamson if (ret) 5849c46f6d4SAlex Williamson return ret; 5859c46f6d4SAlex Williamson 58662994b2dSAlex Williamson if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 5879c46f6d4SAlex Williamson vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), 5889c46f6d4SAlex Williamson dev->dev_addr, dev->addr_len); 5899c46f6d4SAlex Williamson 5909c46f6d4SAlex Williamson return 0; 5919c46f6d4SAlex Williamson } 5929c46f6d4SAlex Williamson 593da74e89dSAmit Shah #ifdef CONFIG_NET_POLL_CONTROLLER 594da74e89dSAmit Shah static void virtnet_netpoll(struct net_device *dev) 595da74e89dSAmit Shah { 596da74e89dSAmit Shah struct virtnet_info *vi = netdev_priv(dev); 597da74e89dSAmit Shah 598da74e89dSAmit Shah napi_schedule(&vi->napi); 599da74e89dSAmit Shah } 600da74e89dSAmit Shah #endif 601da74e89dSAmit Shah 602296f96fcSRusty Russell static int virtnet_open(struct net_device *dev) 603296f96fcSRusty Russell { 604296f96fcSRusty Russell struct virtnet_info *vi = netdev_priv(dev); 605296f96fcSRusty Russell 606296f96fcSRusty Russell napi_enable(&vi->napi); 607a48bd8f6SRusty Russell 608a48bd8f6SRusty Russell /* If all buffers were filled by other side before we napi_enabled, we 609a48bd8f6SRusty Russell * won't get another interrupt, so process any outstanding packets 610370076d9SChristian Borntraeger * now. virtnet_poll wants re-enable the queue, so we disable here. 611370076d9SChristian Borntraeger * We synchronize against interrupts via NAPI_STATE_SCHED */ 612288379f0SBen Hutchings if (napi_schedule_prep(&vi->napi)) { 613a48bd8f6SRusty Russell vi->rvq->vq_ops->disable_cb(vi->rvq); 614288379f0SBen Hutchings __napi_schedule(&vi->napi); 615370076d9SChristian Borntraeger } 616296f96fcSRusty Russell return 0; 617296f96fcSRusty Russell } 618296f96fcSRusty Russell 6192a41f71dSAlex Williamson /* 6202a41f71dSAlex Williamson * Send command via the control virtqueue and check status. Commands 6212a41f71dSAlex Williamson * supported by the hypervisor, as indicated by feature bits, should 6222a41f71dSAlex Williamson * never fail unless improperly formated. 6232a41f71dSAlex Williamson */ 6242a41f71dSAlex Williamson static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 6252a41f71dSAlex Williamson struct scatterlist *data, int out, int in) 6262a41f71dSAlex Williamson { 62723e258e1SAlex Williamson struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; 6282a41f71dSAlex Williamson struct virtio_net_ctrl_hdr ctrl; 6292a41f71dSAlex Williamson virtio_net_ctrl_ack status = ~0; 6302a41f71dSAlex Williamson unsigned int tmp; 63123e258e1SAlex Williamson int i; 6322a41f71dSAlex Williamson 6330ee904c3SAlexander Beregalov /* Caller should know better */ 6340ee904c3SAlexander Beregalov BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || 6350ee904c3SAlexander Beregalov (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); 6362a41f71dSAlex Williamson 6372a41f71dSAlex Williamson out++; /* Add header */ 6382a41f71dSAlex Williamson in++; /* Add return status */ 6392a41f71dSAlex Williamson 6402a41f71dSAlex Williamson ctrl.class = class; 6412a41f71dSAlex Williamson ctrl.cmd = cmd; 6422a41f71dSAlex Williamson 6432a41f71dSAlex Williamson sg_init_table(sg, out + in); 6442a41f71dSAlex Williamson 6452a41f71dSAlex Williamson sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); 64623e258e1SAlex Williamson for_each_sg(data, s, out + in - 2, i) 64723e258e1SAlex Williamson sg_set_buf(&sg[i + 1], sg_virt(s), s->length); 6482a41f71dSAlex Williamson sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); 6492a41f71dSAlex Williamson 6503c1b27d5SRusty Russell BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0); 6512a41f71dSAlex Williamson 6522a41f71dSAlex Williamson vi->cvq->vq_ops->kick(vi->cvq); 6532a41f71dSAlex Williamson 6542a41f71dSAlex Williamson /* 6552a41f71dSAlex Williamson * Spin for a response, the kick causes an ioport write, trapping 6562a41f71dSAlex Williamson * into the hypervisor, so the request should be handled immediately. 6572a41f71dSAlex Williamson */ 6582a41f71dSAlex Williamson while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp)) 6592a41f71dSAlex Williamson cpu_relax(); 6602a41f71dSAlex Williamson 6612a41f71dSAlex Williamson return status == VIRTIO_NET_OK; 6622a41f71dSAlex Williamson } 6632a41f71dSAlex Williamson 664296f96fcSRusty Russell static int virtnet_close(struct net_device *dev) 665296f96fcSRusty Russell { 666296f96fcSRusty Russell struct virtnet_info *vi = netdev_priv(dev); 667296f96fcSRusty Russell 668296f96fcSRusty Russell napi_disable(&vi->napi); 669296f96fcSRusty Russell 670296f96fcSRusty Russell return 0; 671296f96fcSRusty Russell } 672296f96fcSRusty Russell 673a9ea3fc6SHerbert Xu static int virtnet_set_tx_csum(struct net_device *dev, u32 data) 674a9ea3fc6SHerbert Xu { 675a9ea3fc6SHerbert Xu struct virtnet_info *vi = netdev_priv(dev); 676a9ea3fc6SHerbert Xu struct virtio_device *vdev = vi->vdev; 677a9ea3fc6SHerbert Xu 678a9ea3fc6SHerbert Xu if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) 679a9ea3fc6SHerbert Xu return -ENOSYS; 680a9ea3fc6SHerbert Xu 681a9ea3fc6SHerbert Xu return ethtool_op_set_tx_hw_csum(dev, data); 682a9ea3fc6SHerbert Xu } 683a9ea3fc6SHerbert Xu 6842af7698eSAlex Williamson static void virtnet_set_rx_mode(struct net_device *dev) 6852af7698eSAlex Williamson { 6862af7698eSAlex Williamson struct virtnet_info *vi = netdev_priv(dev); 687f565a7c2SAlex Williamson struct scatterlist sg[2]; 6882af7698eSAlex Williamson u8 promisc, allmulti; 689f565a7c2SAlex Williamson struct virtio_net_ctrl_mac *mac_data; 690f565a7c2SAlex Williamson struct dev_addr_list *addr; 691ccffad25SJiri Pirko struct netdev_hw_addr *ha; 692f565a7c2SAlex Williamson void *buf; 693f565a7c2SAlex Williamson int i; 6942af7698eSAlex Williamson 6952af7698eSAlex Williamson /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ 6962af7698eSAlex Williamson if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 6972af7698eSAlex Williamson return; 6982af7698eSAlex Williamson 699f565a7c2SAlex Williamson promisc = ((dev->flags & IFF_PROMISC) != 0); 700f565a7c2SAlex Williamson allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 7012af7698eSAlex Williamson 70223e258e1SAlex Williamson sg_init_one(sg, &promisc, sizeof(promisc)); 7032af7698eSAlex Williamson 7042af7698eSAlex Williamson if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 7052af7698eSAlex Williamson VIRTIO_NET_CTRL_RX_PROMISC, 706f565a7c2SAlex Williamson sg, 1, 0)) 7072af7698eSAlex Williamson dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 7082af7698eSAlex Williamson promisc ? "en" : "dis"); 7092af7698eSAlex Williamson 71023e258e1SAlex Williamson sg_init_one(sg, &allmulti, sizeof(allmulti)); 7112af7698eSAlex Williamson 7122af7698eSAlex Williamson if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 7132af7698eSAlex Williamson VIRTIO_NET_CTRL_RX_ALLMULTI, 714f565a7c2SAlex Williamson sg, 1, 0)) 7152af7698eSAlex Williamson dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 7162af7698eSAlex Williamson allmulti ? "en" : "dis"); 717f565a7c2SAlex Williamson 718f565a7c2SAlex Williamson /* MAC filter - use one buffer for both lists */ 71931278e71SJiri Pirko mac_data = buf = kzalloc(((dev->uc.count + dev->mc_count) * ETH_ALEN) + 720f565a7c2SAlex Williamson (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 721f565a7c2SAlex Williamson if (!buf) { 722f565a7c2SAlex Williamson dev_warn(&dev->dev, "No memory for MAC address buffer\n"); 723f565a7c2SAlex Williamson return; 724f565a7c2SAlex Williamson } 725f565a7c2SAlex Williamson 72623e258e1SAlex Williamson sg_init_table(sg, 2); 72723e258e1SAlex Williamson 728f565a7c2SAlex Williamson /* Store the unicast list and count in the front of the buffer */ 72931278e71SJiri Pirko mac_data->entries = dev->uc.count; 730ccffad25SJiri Pirko i = 0; 73131278e71SJiri Pirko list_for_each_entry(ha, &dev->uc.list, list) 732ccffad25SJiri Pirko memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 733f565a7c2SAlex Williamson 734f565a7c2SAlex Williamson sg_set_buf(&sg[0], mac_data, 73531278e71SJiri Pirko sizeof(mac_data->entries) + (dev->uc.count * ETH_ALEN)); 736f565a7c2SAlex Williamson 737f565a7c2SAlex Williamson /* multicast list and count fill the end */ 73831278e71SJiri Pirko mac_data = (void *)&mac_data->macs[dev->uc.count][0]; 739f565a7c2SAlex Williamson 740f565a7c2SAlex Williamson mac_data->entries = dev->mc_count; 741f565a7c2SAlex Williamson addr = dev->mc_list; 742f565a7c2SAlex Williamson for (i = 0; i < dev->mc_count; i++, addr = addr->next) 743f565a7c2SAlex Williamson memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); 744f565a7c2SAlex Williamson 745f565a7c2SAlex Williamson sg_set_buf(&sg[1], mac_data, 746f565a7c2SAlex Williamson sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN)); 747f565a7c2SAlex Williamson 748f565a7c2SAlex Williamson if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 749f565a7c2SAlex Williamson VIRTIO_NET_CTRL_MAC_TABLE_SET, 750f565a7c2SAlex Williamson sg, 2, 0)) 751f565a7c2SAlex Williamson dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); 752f565a7c2SAlex Williamson 753f565a7c2SAlex Williamson kfree(buf); 7542af7698eSAlex Williamson } 7552af7698eSAlex Williamson 7561824a989SAlex Williamson static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) 7570bde9569SAlex Williamson { 7580bde9569SAlex Williamson struct virtnet_info *vi = netdev_priv(dev); 7590bde9569SAlex Williamson struct scatterlist sg; 7600bde9569SAlex Williamson 76123e258e1SAlex Williamson sg_init_one(&sg, &vid, sizeof(vid)); 7620bde9569SAlex Williamson 7630bde9569SAlex Williamson if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 7640bde9569SAlex Williamson VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) 7650bde9569SAlex Williamson dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 7660bde9569SAlex Williamson } 7670bde9569SAlex Williamson 7681824a989SAlex Williamson static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) 7690bde9569SAlex Williamson { 7700bde9569SAlex Williamson struct virtnet_info *vi = netdev_priv(dev); 7710bde9569SAlex Williamson struct scatterlist sg; 7720bde9569SAlex Williamson 77323e258e1SAlex Williamson sg_init_one(&sg, &vid, sizeof(vid)); 7740bde9569SAlex Williamson 7750bde9569SAlex Williamson if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 7760bde9569SAlex Williamson VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) 7770bde9569SAlex Williamson dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 7780bde9569SAlex Williamson } 7790bde9569SAlex Williamson 7800fc0b732SStephen Hemminger static const struct ethtool_ops virtnet_ethtool_ops = { 781a9ea3fc6SHerbert Xu .set_tx_csum = virtnet_set_tx_csum, 782a9ea3fc6SHerbert Xu .set_sg = ethtool_op_set_sg, 7830276b497SMark McLoughlin .set_tso = ethtool_op_set_tso, 7845c516751SSridhar Samudrala .set_ufo = ethtool_op_set_ufo, 7859f4d26d0SMark McLoughlin .get_link = ethtool_op_get_link, 786a9ea3fc6SHerbert Xu }; 787a9ea3fc6SHerbert Xu 78839da5814SMark McLoughlin #define MIN_MTU 68 78939da5814SMark McLoughlin #define MAX_MTU 65535 79039da5814SMark McLoughlin 79139da5814SMark McLoughlin static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 79239da5814SMark McLoughlin { 79339da5814SMark McLoughlin if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 79439da5814SMark McLoughlin return -EINVAL; 79539da5814SMark McLoughlin dev->mtu = new_mtu; 79639da5814SMark McLoughlin return 0; 79739da5814SMark McLoughlin } 79839da5814SMark McLoughlin 79976288b4eSStephen Hemminger static const struct net_device_ops virtnet_netdev = { 80076288b4eSStephen Hemminger .ndo_open = virtnet_open, 80176288b4eSStephen Hemminger .ndo_stop = virtnet_close, 80276288b4eSStephen Hemminger .ndo_start_xmit = start_xmit, 80376288b4eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 8049c46f6d4SAlex Williamson .ndo_set_mac_address = virtnet_set_mac_address, 8052af7698eSAlex Williamson .ndo_set_rx_mode = virtnet_set_rx_mode, 80676288b4eSStephen Hemminger .ndo_change_mtu = virtnet_change_mtu, 8071824a989SAlex Williamson .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 8081824a989SAlex Williamson .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 80976288b4eSStephen Hemminger #ifdef CONFIG_NET_POLL_CONTROLLER 81076288b4eSStephen Hemminger .ndo_poll_controller = virtnet_netpoll, 81176288b4eSStephen Hemminger #endif 81276288b4eSStephen Hemminger }; 81376288b4eSStephen Hemminger 8149f4d26d0SMark McLoughlin static void virtnet_update_status(struct virtnet_info *vi) 8159f4d26d0SMark McLoughlin { 8169f4d26d0SMark McLoughlin u16 v; 8179f4d26d0SMark McLoughlin 8189f4d26d0SMark McLoughlin if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) 8199f4d26d0SMark McLoughlin return; 8209f4d26d0SMark McLoughlin 8219f4d26d0SMark McLoughlin vi->vdev->config->get(vi->vdev, 8229f4d26d0SMark McLoughlin offsetof(struct virtio_net_config, status), 8239f4d26d0SMark McLoughlin &v, sizeof(v)); 8249f4d26d0SMark McLoughlin 8259f4d26d0SMark McLoughlin /* Ignore unknown (future) status bits */ 8269f4d26d0SMark McLoughlin v &= VIRTIO_NET_S_LINK_UP; 8279f4d26d0SMark McLoughlin 8289f4d26d0SMark McLoughlin if (vi->status == v) 8299f4d26d0SMark McLoughlin return; 8309f4d26d0SMark McLoughlin 8319f4d26d0SMark McLoughlin vi->status = v; 8329f4d26d0SMark McLoughlin 8339f4d26d0SMark McLoughlin if (vi->status & VIRTIO_NET_S_LINK_UP) { 8349f4d26d0SMark McLoughlin netif_carrier_on(vi->dev); 8359f4d26d0SMark McLoughlin netif_wake_queue(vi->dev); 8369f4d26d0SMark McLoughlin } else { 8379f4d26d0SMark McLoughlin netif_carrier_off(vi->dev); 8389f4d26d0SMark McLoughlin netif_stop_queue(vi->dev); 8399f4d26d0SMark McLoughlin } 8409f4d26d0SMark McLoughlin } 8419f4d26d0SMark McLoughlin 8429f4d26d0SMark McLoughlin static void virtnet_config_changed(struct virtio_device *vdev) 8439f4d26d0SMark McLoughlin { 8449f4d26d0SMark McLoughlin struct virtnet_info *vi = vdev->priv; 8459f4d26d0SMark McLoughlin 8469f4d26d0SMark McLoughlin virtnet_update_status(vi); 8479f4d26d0SMark McLoughlin } 8489f4d26d0SMark McLoughlin 849296f96fcSRusty Russell static int virtnet_probe(struct virtio_device *vdev) 850296f96fcSRusty Russell { 851296f96fcSRusty Russell int err; 852296f96fcSRusty Russell struct net_device *dev; 853296f96fcSRusty Russell struct virtnet_info *vi; 854d2a7dddaSMichael S. Tsirkin struct virtqueue *vqs[3]; 855d2a7dddaSMichael S. Tsirkin vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; 856d2a7dddaSMichael S. Tsirkin const char *names[] = { "input", "output", "control" }; 857d2a7dddaSMichael S. Tsirkin int nvqs; 858296f96fcSRusty Russell 859296f96fcSRusty Russell /* Allocate ourselves a network device with room for our info */ 860296f96fcSRusty Russell dev = alloc_etherdev(sizeof(struct virtnet_info)); 861296f96fcSRusty Russell if (!dev) 862296f96fcSRusty Russell return -ENOMEM; 863296f96fcSRusty Russell 864296f96fcSRusty Russell /* Set up network device as normal. */ 86576288b4eSStephen Hemminger dev->netdev_ops = &virtnet_netdev; 866296f96fcSRusty Russell dev->features = NETIF_F_HIGHDMA; 867a9ea3fc6SHerbert Xu SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); 868296f96fcSRusty Russell SET_NETDEV_DEV(dev, &vdev->dev); 869296f96fcSRusty Russell 870296f96fcSRusty Russell /* Do we support "hardware" checksums? */ 871c45a6816SRusty Russell if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 872296f96fcSRusty Russell /* This opens up the world of extra features. */ 873296f96fcSRusty Russell dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 874c45a6816SRusty Russell if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 87534a48579SRusty Russell dev->features |= NETIF_F_TSO | NETIF_F_UFO 87634a48579SRusty Russell | NETIF_F_TSO_ECN | NETIF_F_TSO6; 87734a48579SRusty Russell } 8785539ae96SRusty Russell /* Individual feature bits: what can host handle? */ 879c45a6816SRusty Russell if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 8805539ae96SRusty Russell dev->features |= NETIF_F_TSO; 881c45a6816SRusty Russell if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 8825539ae96SRusty Russell dev->features |= NETIF_F_TSO6; 883c45a6816SRusty Russell if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 8845539ae96SRusty Russell dev->features |= NETIF_F_TSO_ECN; 885c45a6816SRusty Russell if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 8865539ae96SRusty Russell dev->features |= NETIF_F_UFO; 887296f96fcSRusty Russell } 888296f96fcSRusty Russell 889296f96fcSRusty Russell /* Configuration may specify what MAC to use. Otherwise random. */ 890c45a6816SRusty Russell if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 891a586d4f6SRusty Russell vdev->config->get(vdev, 892a586d4f6SRusty Russell offsetof(struct virtio_net_config, mac), 893a586d4f6SRusty Russell dev->dev_addr, dev->addr_len); 89462994b2dSAlex Williamson } else 895296f96fcSRusty Russell random_ether_addr(dev->dev_addr); 896296f96fcSRusty Russell 897296f96fcSRusty Russell /* Set up our device-specific information */ 898296f96fcSRusty Russell vi = netdev_priv(dev); 8996c0cd7c0SDor Laor netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); 900296f96fcSRusty Russell vi->dev = dev; 901296f96fcSRusty Russell vi->vdev = vdev; 902d9d5dcc8SChristian Borntraeger vdev->priv = vi; 903fb6813f4SRusty Russell vi->pages = NULL; 9043161e453SRusty Russell INIT_DELAYED_WORK(&vi->refill, refill_work); 905296f96fcSRusty Russell 906363f1514SRusty Russell /* If they give us a callback when all buffers are done, we don't need 907363f1514SRusty Russell * the timer. */ 908363f1514SRusty Russell vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); 909363f1514SRusty Russell 91097402b96SHerbert Xu /* If we can receive ANY GSO packets, we must allocate large ones. */ 91197402b96SHerbert Xu if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) 91297402b96SHerbert Xu || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) 91397402b96SHerbert Xu || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) 91497402b96SHerbert Xu vi->big_packets = true; 91597402b96SHerbert Xu 9163f2c31d9SMark McLoughlin if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 9173f2c31d9SMark McLoughlin vi->mergeable_rx_bufs = true; 9183f2c31d9SMark McLoughlin 919d2a7dddaSMichael S. Tsirkin /* We expect two virtqueues, receive then send, 920d2a7dddaSMichael S. Tsirkin * and optionally control. */ 921d2a7dddaSMichael S. Tsirkin nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; 922296f96fcSRusty Russell 923d2a7dddaSMichael S. Tsirkin err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names); 924d2a7dddaSMichael S. Tsirkin if (err) 925d2a7dddaSMichael S. Tsirkin goto free; 926d2a7dddaSMichael S. Tsirkin 927d2a7dddaSMichael S. Tsirkin vi->rvq = vqs[0]; 928d2a7dddaSMichael S. Tsirkin vi->svq = vqs[1]; 929296f96fcSRusty Russell 9302a41f71dSAlex Williamson if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { 931d2a7dddaSMichael S. Tsirkin vi->cvq = vqs[2]; 9320bde9569SAlex Williamson 9330bde9569SAlex Williamson if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 9340bde9569SAlex Williamson dev->features |= NETIF_F_HW_VLAN_FILTER; 9352a41f71dSAlex Williamson } 9362a41f71dSAlex Williamson 937296f96fcSRusty Russell /* Initialize our empty receive and send queues. */ 938296f96fcSRusty Russell skb_queue_head_init(&vi->recv); 939296f96fcSRusty Russell skb_queue_head_init(&vi->send); 940296f96fcSRusty Russell 94111a3a154SRusty Russell tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); 94211a3a154SRusty Russell 943363f1514SRusty Russell if (!vi->free_in_tasklet) 94414c998f0SMark McLoughlin setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); 94514c998f0SMark McLoughlin 946296f96fcSRusty Russell err = register_netdev(dev); 947296f96fcSRusty Russell if (err) { 948296f96fcSRusty Russell pr_debug("virtio_net: registering device failed\n"); 949d2a7dddaSMichael S. Tsirkin goto free_vqs; 950296f96fcSRusty Russell } 951b3369c1fSRusty Russell 952b3369c1fSRusty Russell /* Last of all, set up some receive buffers. */ 9533161e453SRusty Russell try_fill_recv(vi, GFP_KERNEL); 954b3369c1fSRusty Russell 955b3369c1fSRusty Russell /* If we didn't even get one input buffer, we're useless. */ 956b3369c1fSRusty Russell if (vi->num == 0) { 957b3369c1fSRusty Russell err = -ENOMEM; 958b3369c1fSRusty Russell goto unregister; 959b3369c1fSRusty Russell } 960b3369c1fSRusty Russell 9619f4d26d0SMark McLoughlin vi->status = VIRTIO_NET_S_LINK_UP; 9629f4d26d0SMark McLoughlin virtnet_update_status(vi); 9634783256eSPantelis Koukousoulas netif_carrier_on(dev); 9649f4d26d0SMark McLoughlin 965296f96fcSRusty Russell pr_debug("virtnet: registered device %s\n", dev->name); 966296f96fcSRusty Russell return 0; 967296f96fcSRusty Russell 968b3369c1fSRusty Russell unregister: 969b3369c1fSRusty Russell unregister_netdev(dev); 9703161e453SRusty Russell cancel_delayed_work_sync(&vi->refill); 971d2a7dddaSMichael S. Tsirkin free_vqs: 972d2a7dddaSMichael S. Tsirkin vdev->config->del_vqs(vdev); 973296f96fcSRusty Russell free: 974296f96fcSRusty Russell free_netdev(dev); 975296f96fcSRusty Russell return err; 976296f96fcSRusty Russell } 977296f96fcSRusty Russell 978296f96fcSRusty Russell static void virtnet_remove(struct virtio_device *vdev) 979296f96fcSRusty Russell { 98074b2553fSRusty Russell struct virtnet_info *vi = vdev->priv; 981b3369c1fSRusty Russell struct sk_buff *skb; 982b3369c1fSRusty Russell 9836e5aa7efSRusty Russell /* Stop all the virtqueues. */ 9846e5aa7efSRusty Russell vdev->config->reset(vdev); 9856e5aa7efSRusty Russell 986363f1514SRusty Russell if (!vi->free_in_tasklet) 98714c998f0SMark McLoughlin del_timer_sync(&vi->xmit_free_timer); 98814c998f0SMark McLoughlin 989b3369c1fSRusty Russell /* Free our skbs in send and recv queues, if any. */ 990b3369c1fSRusty Russell while ((skb = __skb_dequeue(&vi->recv)) != NULL) { 991b3369c1fSRusty Russell kfree_skb(skb); 992b3369c1fSRusty Russell vi->num--; 993b3369c1fSRusty Russell } 994288369ccSWang Chen __skb_queue_purge(&vi->send); 995b3369c1fSRusty Russell 996b3369c1fSRusty Russell BUG_ON(vi->num != 0); 99774b2553fSRusty Russell 99874b2553fSRusty Russell unregister_netdev(vi->dev); 9993161e453SRusty Russell cancel_delayed_work_sync(&vi->refill); 1000fb6813f4SRusty Russell 1001d2a7dddaSMichael S. Tsirkin vdev->config->del_vqs(vi->vdev); 1002d2a7dddaSMichael S. Tsirkin 1003fb6813f4SRusty Russell while (vi->pages) 1004fb6813f4SRusty Russell __free_pages(get_a_page(vi, GFP_KERNEL), 0); 1005fb6813f4SRusty Russell 100674b2553fSRusty Russell free_netdev(vi->dev); 1007296f96fcSRusty Russell } 1008296f96fcSRusty Russell 1009296f96fcSRusty Russell static struct virtio_device_id id_table[] = { 1010296f96fcSRusty Russell { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1011296f96fcSRusty Russell { 0 }, 1012296f96fcSRusty Russell }; 1013296f96fcSRusty Russell 1014c45a6816SRusty Russell static unsigned int features[] = { 10155e4fe5c4SMark McLoughlin VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 10165e4fe5c4SMark McLoughlin VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1017c45a6816SRusty Russell VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, 101897402b96SHerbert Xu VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 10195c516751SSridhar Samudrala VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, 10202a41f71dSAlex Williamson VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 10210bde9569SAlex Williamson VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 102297402b96SHerbert Xu VIRTIO_F_NOTIFY_ON_EMPTY, 1023c45a6816SRusty Russell }; 1024c45a6816SRusty Russell 1025296f96fcSRusty Russell static struct virtio_driver virtio_net = { 1026c45a6816SRusty Russell .feature_table = features, 1027c45a6816SRusty Russell .feature_table_size = ARRAY_SIZE(features), 1028296f96fcSRusty Russell .driver.name = KBUILD_MODNAME, 1029296f96fcSRusty Russell .driver.owner = THIS_MODULE, 1030296f96fcSRusty Russell .id_table = id_table, 1031296f96fcSRusty Russell .probe = virtnet_probe, 1032296f96fcSRusty Russell .remove = __devexit_p(virtnet_remove), 10339f4d26d0SMark McLoughlin .config_changed = virtnet_config_changed, 1034296f96fcSRusty Russell }; 1035296f96fcSRusty Russell 1036296f96fcSRusty Russell static int __init init(void) 1037296f96fcSRusty Russell { 1038296f96fcSRusty Russell return register_virtio_driver(&virtio_net); 1039296f96fcSRusty Russell } 1040296f96fcSRusty Russell 1041296f96fcSRusty Russell static void __exit fini(void) 1042296f96fcSRusty Russell { 1043296f96fcSRusty Russell unregister_virtio_driver(&virtio_net); 1044296f96fcSRusty Russell } 1045296f96fcSRusty Russell module_init(init); 1046296f96fcSRusty Russell module_exit(fini); 1047296f96fcSRusty Russell 1048296f96fcSRusty Russell MODULE_DEVICE_TABLE(virtio, id_table); 1049296f96fcSRusty Russell MODULE_DESCRIPTION("Virtio network driver"); 1050296f96fcSRusty Russell MODULE_LICENSE("GPL"); 1051