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Date: Fri, 28 Nov 2014 08:32:11 +0008
From: Jason Wang <jasowang@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
cornelia.huck@...ibm.com, rusty@....ibm.com, nab@...ux-iscsi.org,
pbonzini@...hat.com, thuth@...ux.vnet.ibm.com,
dahi@...ux.vnet.ibm.com, Vlad Yasevich <vyasevich@...il.com>,
Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>,
Tom Herbert <therbert@...gle.com>,
Ben Hutchings <ben@...adent.org.uk>, netdev@...r.kernel.org
Subject: Re: [PATCH v6 41/46] macvtap: TUN_VNET_HDR support
On Fri, Nov 28, 2014 at 4:11 AM, Michael S. Tsirkin <mst@...hat.com>
wrote:
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> 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 880cc09..af90ab5 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;
>
> --
> MST
Reviewed-by: Jason Wang <jasowang@...hat.com>
btw, title should be macvtap: IFF_VNET_LE support
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