From 6ae7feb316d656b6b9b182dc6caa5526f0edce51 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Sun, 23 Nov 2014 17:24:15 +0200 Subject: [PATCH] macvtap: TUN_VNET_LE support Signed-off-by: Michael S. Tsirkin Reviewed-by: Jason Wang --- drivers/net/macvtap.c | 68 +++++++++++++++++++++++++++---------------- 1 file changed, 43 insertions(+), 25 deletions(-) diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index 880cc090dc44..af90ab5e5768 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -45,6 +45,18 @@ struct macvtap_queue { struct list_head next; }; +#define MACVTAP_FEATURES (IFF_VNET_HDR | IFF_VNET_LE | IFF_MULTI_QUEUE) + +static inline u16 macvtap16_to_cpu(struct macvtap_queue *q, __virtio16 val) +{ + return __virtio16_to_cpu(q->flags & IFF_VNET_LE, val); +} + +static inline __virtio16 cpu_to_macvtap16(struct macvtap_queue *q, u16 val) +{ + return __cpu_to_virtio16(q->flags & IFF_VNET_LE, val); +} + static struct proto macvtap_proto = { .name = "macvtap", .owner = THIS_MODULE, @@ -557,7 +569,8 @@ static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should * be shared with the tun/tap driver. */ -static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, +static int macvtap_skb_from_vnet_hdr(struct macvtap_queue *q, + struct sk_buff *skb, struct virtio_net_hdr *vnet_hdr) { unsigned short gso_type = 0; @@ -588,13 +601,13 @@ static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, } if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { - if (!skb_partial_csum_set(skb, vnet_hdr->csum_start, - vnet_hdr->csum_offset)) + if (!skb_partial_csum_set(skb, macvtap16_to_cpu(q, vnet_hdr->csum_start), + macvtap16_to_cpu(q, vnet_hdr->csum_offset))) return -EINVAL; } if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { - skb_shinfo(skb)->gso_size = vnet_hdr->gso_size; + skb_shinfo(skb)->gso_size = macvtap16_to_cpu(q, vnet_hdr->gso_size); skb_shinfo(skb)->gso_type = gso_type; /* Header must be checked, and gso_segs computed. */ @@ -604,8 +617,9 @@ static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, return 0; } -static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, - struct virtio_net_hdr *vnet_hdr) +static void macvtap_skb_to_vnet_hdr(struct macvtap_queue *q, + const struct sk_buff *skb, + struct virtio_net_hdr *vnet_hdr) { memset(vnet_hdr, 0, sizeof(*vnet_hdr)); @@ -613,8 +627,8 @@ static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, struct skb_shared_info *sinfo = skb_shinfo(skb); /* This is a hint as to how much should be linear. */ - vnet_hdr->hdr_len = skb_headlen(skb); - vnet_hdr->gso_size = sinfo->gso_size; + vnet_hdr->hdr_len = cpu_to_macvtap16(q, skb_headlen(skb)); + vnet_hdr->gso_size = cpu_to_macvtap16(q, sinfo->gso_size); if (sinfo->gso_type & SKB_GSO_TCPV4) vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; else if (sinfo->gso_type & SKB_GSO_TCPV6) @@ -628,10 +642,13 @@ static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, if (skb->ip_summed == CHECKSUM_PARTIAL) { vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; - vnet_hdr->csum_start = skb_checksum_start_offset(skb); if (vlan_tx_tag_present(skb)) - vnet_hdr->csum_start += VLAN_HLEN; - vnet_hdr->csum_offset = skb->csum_offset; + vnet_hdr->csum_start = cpu_to_macvtap16(q, + skb_checksum_start_offset(skb) + VLAN_HLEN); + else + vnet_hdr->csum_start = cpu_to_macvtap16(q, + skb_checksum_start_offset(skb)); + vnet_hdr->csum_offset = cpu_to_macvtap16(q, skb->csum_offset); } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; } /* else everything is zero */ @@ -666,12 +683,14 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, if (err < 0) goto err; if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && - vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > - vnet_hdr.hdr_len) - vnet_hdr.hdr_len = vnet_hdr.csum_start + - vnet_hdr.csum_offset + 2; + macvtap16_to_cpu(q, vnet_hdr.csum_start) + + macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2 > + macvtap16_to_cpu(q, vnet_hdr.hdr_len)) + vnet_hdr.hdr_len = cpu_to_macvtap16(q, + macvtap16_to_cpu(q, vnet_hdr.csum_start) + + macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2); err = -EINVAL; - if (vnet_hdr.hdr_len > len) + if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > len) goto err; } @@ -684,7 +703,8 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, goto err; if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) { - copylen = vnet_hdr.hdr_len ? vnet_hdr.hdr_len : GOODCOPY_LEN; + copylen = vnet_hdr.hdr_len ? + macvtap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN; if (copylen > good_linear) copylen = good_linear; linear = copylen; @@ -695,10 +715,10 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, if (!zerocopy) { copylen = len; - if (vnet_hdr.hdr_len > good_linear) + if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > good_linear) linear = good_linear; else - linear = vnet_hdr.hdr_len; + linear = macvtap16_to_cpu(q, vnet_hdr.hdr_len); } skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen, @@ -725,7 +745,7 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, skb->protocol = eth_hdr(skb)->h_proto; if (vnet_hdr_len) { - err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr); + err = macvtap_skb_from_vnet_hdr(q, skb, &vnet_hdr); if (err) goto err_kfree; } @@ -791,7 +811,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q, if ((len -= vnet_hdr_len) < 0) return -EINVAL; - macvtap_skb_to_vnet_hdr(skb, &vnet_hdr); + macvtap_skb_to_vnet_hdr(q, skb, &vnet_hdr); if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr))) return -EFAULT; @@ -1003,8 +1023,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd, return -EFAULT; ret = 0; - if ((u & ~(IFF_VNET_HDR | IFF_MULTI_QUEUE)) != - (IFF_NO_PI | IFF_TAP)) + if ((u & ~MACVTAP_FEATURES) != (IFF_NO_PI | IFF_TAP)) ret = -EINVAL; else q->flags = u; @@ -1036,8 +1055,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd, return ret; case TUNGETFEATURES: - if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR | - IFF_MULTI_QUEUE, up)) + if (put_user(IFF_TAP | IFF_NO_PI | MACVTAP_FEATURES, up)) return -EFAULT; return 0; -- 2.20.1