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Date: Fri, 28 Nov 2014 08:27:48 +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, Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>,
Ben Hutchings <ben@...adent.org.uk>,
Tom Herbert <therbert@...gle.com>,
Masatake YAMATO <yamato@...hat.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Xi Wang <xii@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v6 40/46] tun: TUN_VNET_LE support, fix sparse warnings
for virtio headers
On Fri, Nov 28, 2014 at 4:11 AM, Michael S. Tsirkin <mst@...hat.com>
wrote:
> Pretty straight-forward: convert all fields to/from
> virtio endian-ness.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> drivers/net/tun.c | 48
> +++++++++++++++++++++++++++++-------------------
> 1 file changed, 29 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 61c000c..f411ffd 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -111,7 +111,7 @@ do { \
> #define TUN_FASYNC IFF_ATTACH_QUEUE
>
> #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
> - IFF_MULTI_QUEUE)
> + IFF_VNET_LE | IFF_MULTI_QUEUE)
> #define GOODCOPY_LEN 128
>
> #define FLT_EXACT_COUNT 8
> @@ -205,6 +205,16 @@ struct tun_struct {
> u32 flow_count;
> };
>
> +static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16
> val)
> +{
> + return __virtio16_to_cpu(tun->flags & IFF_VNET_LE, val);
> +}
> +
> +static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16
> val)
> +{
> + return __cpu_to_virtio16(tun->flags & IFF_VNET_LE, val);
> +}
> +
> static inline u32 tun_hashfn(u32 rxhash)
> {
> return rxhash & 0x3ff;
> @@ -1053,10 +1063,10 @@ static ssize_t tun_get_user(struct tun_struct
> *tun, struct tun_file *tfile,
> return -EFAULT;
>
> if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
> - gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)
> - gso.hdr_len = gso.csum_start + gso.csum_offset + 2;
> + tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun,
> gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len))
> + gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start)
> + tun16_to_cpu(tun, gso.csum_offset) + 2);
>
> - if (gso.hdr_len > len)
> + if (tun16_to_cpu(tun, gso.hdr_len) > len)
> return -EINVAL;
> offset += tun->vnet_hdr_sz;
> }
> @@ -1064,7 +1074,7 @@ static ssize_t tun_get_user(struct tun_struct
> *tun, struct tun_file *tfile,
> if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) {
> align += NET_IP_ALIGN;
> if (unlikely(len < ETH_HLEN ||
> - (gso.hdr_len && gso.hdr_len < ETH_HLEN)))
> + (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN)))
> return -EINVAL;
> }
>
> @@ -1075,7 +1085,7 @@ static ssize_t tun_get_user(struct tun_struct
> *tun, struct tun_file *tfile,
> * enough room for skb expand head in case it is used.
> * The rest of the buffer is mapped from userspace.
> */
> - copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN;
> + copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) :
> GOODCOPY_LEN;
> if (copylen > good_linear)
> copylen = good_linear;
> linear = copylen;
> @@ -1085,10 +1095,10 @@ static ssize_t tun_get_user(struct tun_struct
> *tun, struct tun_file *tfile,
>
> if (!zerocopy) {
> copylen = len;
> - if (gso.hdr_len > good_linear)
> + if (tun16_to_cpu(tun, gso.hdr_len) > good_linear)
> linear = good_linear;
> else
> - linear = gso.hdr_len;
> + linear = tun16_to_cpu(tun, gso.hdr_len);
> }
>
> skb = tun_alloc_skb(tfile, align, copylen, linear, noblock);
> @@ -1115,8 +1125,8 @@ static ssize_t tun_get_user(struct tun_struct
> *tun, struct tun_file *tfile,
> }
>
> if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
> - if (!skb_partial_csum_set(skb, gso.csum_start,
> - gso.csum_offset)) {
> + if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start),
> + tun16_to_cpu(tun, gso.csum_offset))) {
> tun->dev->stats.rx_frame_errors++;
> kfree_skb(skb);
> return -EINVAL;
> @@ -1184,7 +1194,7 @@ static ssize_t tun_get_user(struct tun_struct
> *tun, struct tun_file *tfile,
> if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
> skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
>
> - skb_shinfo(skb)->gso_size = gso.gso_size;
> + skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size);
> if (skb_shinfo(skb)->gso_size == 0) {
> tun->dev->stats.rx_frame_errors++;
> kfree_skb(skb);
> @@ -1276,8 +1286,8 @@ static ssize_t tun_put_user(struct tun_struct
> *tun,
> struct skb_shared_info *sinfo = skb_shinfo(skb);
>
> /* This is a hint as to how much should be linear. */
> - gso.hdr_len = skb_headlen(skb);
> - gso.gso_size = sinfo->gso_size;
> + gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb));
> + gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size);
> if (sinfo->gso_type & SKB_GSO_TCPV4)
> gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
> else if (sinfo->gso_type & SKB_GSO_TCPV6)
> @@ -1285,12 +1295,12 @@ static ssize_t tun_put_user(struct tun_struct
> *tun,
> else {
> pr_err("unexpected GSO type: "
> "0x%x, gso_size %d, hdr_len %d\n",
> - sinfo->gso_type, gso.gso_size,
> - gso.hdr_len);
> + sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size),
> + tun16_to_cpu(tun, gso.hdr_len));
> print_hex_dump(KERN_ERR, "tun: ",
> DUMP_PREFIX_NONE,
> 16, 1, skb->head,
> - min((int)gso.hdr_len, 64), true);
> + min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true);
> WARN_ON_ONCE(1);
> return -EINVAL;
> }
> @@ -1301,9 +1311,9 @@ static ssize_t tun_put_user(struct tun_struct
> *tun,
>
> if (skb->ip_summed == CHECKSUM_PARTIAL) {
> gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
> - gso.csum_start = skb_checksum_start_offset(skb) +
> - vlan_hlen;
> - gso.csum_offset = skb->csum_offset;
> + gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb)
> +
> + vlan_hlen);
> + gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset);
> } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
> gso.flags = VIRTIO_NET_HDR_F_DATA_VALID;
> } /* else everything is zero */
> --
> MST
Reviewed-by: Jason Wang <jasowang@...hat.com>
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