From: Jason Wang <jasowang@redhat.com> To: Eli Cohen <elic@nvidia.com> Cc: mst <mst@redhat.com>, virtualization <virtualization@lists.linux-foundation.org>, linux-kernel <linux-kernel@vger.kernel.org>, Si-Wei Liu <si-wei.liu@oracle.com> Subject: Re: [PATCH] vdpa: Warn if MTU configured is too low Date: Wed, 11 May 2022 17:34:25 +0800 [thread overview] Message-ID: <CACGkMEt9h=hGH9cGj=NNLrGtvg2PguS8-pe4trxNUQOxmTRsog@mail.gmail.com> (raw) In-Reply-To: <20220511084804.82482-1-elic@nvidia.com> On Wed, May 11, 2022 at 4:48 PM Eli Cohen <elic@nvidia.com> wrote: > > Following the recommendation in virio spec 1.1, a device offering > VIRTIO_NET_F_MTU should set the mtu to at least 1280 bytes. > > Print a warning if this recommendation is not met. > > Signed-off-by: Eli Cohen <elic@nvidia.com> I wonder why it's a must? > --- > drivers/vdpa/vdpa.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c > index 91f4c13c7c7c..961168fe9094 100644 > --- a/drivers/vdpa/vdpa.c > +++ b/drivers/vdpa/vdpa.c > @@ -583,6 +583,9 @@ vdpa_nl_cmd_mgmtdev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) > BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) | \ > BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP)) > > +/* Recommended virtio spec 1.1 section 5.1.4.1 */ > +#define VIRTIO_MIN_PREFERRED_MTU 1280 > + > static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *info) > { > struct vdpa_dev_set_config config = {}; > @@ -634,6 +637,10 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i > err = PTR_ERR(mdev); > goto err; > } > + if ((mdev->supported_features & BIT_ULL(VIRTIO_NET_F_MTU)) && > + (config.mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) && > + config.net.mtu < VIRTIO_MIN_PREFERRED_MTU)) Should be <= ? Thanks > + pr_warn("MTU is below recommended value\n"); > if ((config.mask & mdev->config_attr_mask) != config.mask) { > NL_SET_ERR_MSG_MOD(info->extack, > "All provided attributes are not supported"); > @@ -1135,7 +1142,7 @@ static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = { > [VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING }, > [VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR, > /* virtio spec 1.1 section 5.1.4.1 for valid MTU range */ > - [VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68), > + [VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, ETH_MIN_MTU), > }; > > static const struct genl_ops vdpa_nl_ops[] = { > -- > 2.35.1 >
WARNING: multiple messages have this Message-ID (diff)
From: Jason Wang <jasowang@redhat.com> To: Eli Cohen <elic@nvidia.com> Cc: Si-Wei Liu <si-wei.liu@oracle.com>, virtualization <virtualization@lists.linux-foundation.org>, linux-kernel <linux-kernel@vger.kernel.org>, mst <mst@redhat.com> Subject: Re: [PATCH] vdpa: Warn if MTU configured is too low Date: Wed, 11 May 2022 17:34:25 +0800 [thread overview] Message-ID: <CACGkMEt9h=hGH9cGj=NNLrGtvg2PguS8-pe4trxNUQOxmTRsog@mail.gmail.com> (raw) In-Reply-To: <20220511084804.82482-1-elic@nvidia.com> On Wed, May 11, 2022 at 4:48 PM Eli Cohen <elic@nvidia.com> wrote: > > Following the recommendation in virio spec 1.1, a device offering > VIRTIO_NET_F_MTU should set the mtu to at least 1280 bytes. > > Print a warning if this recommendation is not met. > > Signed-off-by: Eli Cohen <elic@nvidia.com> I wonder why it's a must? > --- > drivers/vdpa/vdpa.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c > index 91f4c13c7c7c..961168fe9094 100644 > --- a/drivers/vdpa/vdpa.c > +++ b/drivers/vdpa/vdpa.c > @@ -583,6 +583,9 @@ vdpa_nl_cmd_mgmtdev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) > BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) | \ > BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP)) > > +/* Recommended virtio spec 1.1 section 5.1.4.1 */ > +#define VIRTIO_MIN_PREFERRED_MTU 1280 > + > static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *info) > { > struct vdpa_dev_set_config config = {}; > @@ -634,6 +637,10 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i > err = PTR_ERR(mdev); > goto err; > } > + if ((mdev->supported_features & BIT_ULL(VIRTIO_NET_F_MTU)) && > + (config.mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) && > + config.net.mtu < VIRTIO_MIN_PREFERRED_MTU)) Should be <= ? Thanks > + pr_warn("MTU is below recommended value\n"); > if ((config.mask & mdev->config_attr_mask) != config.mask) { > NL_SET_ERR_MSG_MOD(info->extack, > "All provided attributes are not supported"); > @@ -1135,7 +1142,7 @@ static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = { > [VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING }, > [VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR, > /* virtio spec 1.1 section 5.1.4.1 for valid MTU range */ > - [VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68), > + [VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, ETH_MIN_MTU), > }; > > static const struct genl_ops vdpa_nl_ops[] = { > -- > 2.35.1 > _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2022-05-11 9:34 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-11 8:48 [PATCH] vdpa: Warn if MTU configured is too low Eli Cohen 2022-05-11 9:34 ` Jason Wang [this message] 2022-05-11 9:34 ` Jason Wang 2022-05-11 9:58 ` Michael S. Tsirkin 2022-05-11 9:58 ` Michael S. Tsirkin 2022-05-11 10:17 ` Jason Wang 2022-05-11 10:17 ` Jason Wang 2022-05-11 10:02 ` Eli Cohen 2022-05-11 10:18 ` Jason Wang 2022-05-11 10:18 ` Jason Wang 2022-05-11 10:53 ` Eli Cohen
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