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net: add gso_ipv4_max_size and gro_ipv4_max_size per device

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This patch introduces gso_ipv4_max_size and gro_ipv4_max_size
per device and adds netlink attributes for them, so that IPV4
BIG TCP can be guarded by a separate tunable in the next patch.

To not break the old application using "gso/gro_max_size" for
IPv4 GSO packets, this patch updates "gso/gro_ipv4_max_size"
in netif_set_gso/gro_max_size() if the new size isn't greater
than GSO_LEGACY_MAX_SIZE, so that nothing will change even if
userspace doesn't realize the new netlink attributes.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xin Long 2023-01-28 10:58:38 -05:00 committed by Jakub Kicinski
parent 8e08bb75b6
commit 9eefedd58a
5 changed files with 64 additions and 0 deletions
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6
include/linux/netdevice.h
View File

@ -1964,6 +1964,8 @@ enum netdev_ml_priv_type {
* @gso_max_segs: Maximum number of segments that can be passed to the
* NIC for GSO
* @tso_max_segs: Device (as in HW) limit on the max TSO segment count
* @gso_ipv4_max_size: Maximum size of generic segmentation offload,
* for IPv4.
*
* @dcbnl_ops: Data Center Bridging netlink ops
* @num_tc: Number of traffic classes in the net device
@ -2004,6 +2006,8 @@ enum netdev_ml_priv_type {
* keep a list of interfaces to be deleted.
* @gro_max_size: Maximum size of aggregated packet in generic
* receive offload (GRO)
* @gro_ipv4_max_size: Maximum size of aggregated packet in generic
* receive offload (GRO), for IPv4.
*
* @dev_addr_shadow: Copy of @dev_addr to catch direct writes.
* @linkwatch_dev_tracker: refcount tracker used by linkwatch.
@ -2207,6 +2211,7 @@ struct net_device {
*/
#define GRO_MAX_SIZE (8 * 65535u)
unsigned int gro_max_size;
unsigned int gro_ipv4_max_size;
rx_handler_func_t __rcu *rx_handler;
void __rcu *rx_handler_data;
@ -2330,6 +2335,7 @@ struct net_device {
u16 gso_max_segs;
#define TSO_MAX_SEGS U16_MAX
u16 tso_max_segs;
unsigned int gso_ipv4_max_size;
#ifdef CONFIG_DCB
const struct dcbnl_rtnl_ops *dcbnl_ops;

3
include/uapi/linux/if_link.h
View File

@ -374,6 +374,9 @@ enum {
IFLA_DEVLINK_PORT,
IFLA_GSO_IPV4_MAX_SIZE,
IFLA_GRO_IPV4_MAX_SIZE,
__IFLA_MAX
};

4
net/core/dev.c
View File

@ -3001,6 +3001,8 @@ void netif_set_tso_max_size(struct net_device *dev, unsigned int size)
dev->tso_max_size = min(GSO_MAX_SIZE, size);
if (size < READ_ONCE(dev->gso_max_size))
netif_set_gso_max_size(dev, size);
if (size < READ_ONCE(dev->gso_ipv4_max_size))
netif_set_gso_ipv4_max_size(dev, size);
}
EXPORT_SYMBOL(netif_set_tso_max_size);
@ -10614,6 +10616,8 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
dev->gso_max_size = GSO_LEGACY_MAX_SIZE;
dev->gso_max_segs = GSO_MAX_SEGS;
dev->gro_max_size = GRO_LEGACY_MAX_SIZE;
dev->gso_ipv4_max_size = GSO_LEGACY_MAX_SIZE;
dev->gro_ipv4_max_size = GRO_LEGACY_MAX_SIZE;
dev->tso_max_size = TSO_LEGACY_MAX_SIZE;
dev->tso_max_segs = TSO_MAX_SEGS;
dev->upper_level = 1;

18
net/core/dev.h
View File

@ -100,6 +100,8 @@ static inline void netif_set_gso_max_size(struct net_device *dev,
{
/* dev->gso_max_size is read locklessly from sk_setup_caps() */
WRITE_ONCE(dev->gso_max_size, size);
if (size <= GSO_LEGACY_MAX_SIZE)
WRITE_ONCE(dev->gso_ipv4_max_size, size);
}
static inline void netif_set_gso_max_segs(struct net_device *dev,
@ -114,6 +116,22 @@ static inline void netif_set_gro_max_size(struct net_device *dev,
{
/* This pairs with the READ_ONCE() in skb_gro_receive() */
WRITE_ONCE(dev->gro_max_size, size);
if (size <= GRO_LEGACY_MAX_SIZE)
WRITE_ONCE(dev->gro_ipv4_max_size, size);
}
static inline void netif_set_gso_ipv4_max_size(struct net_device *dev,
unsigned int size)
{
/* dev->gso_ipv4_max_size is read locklessly from sk_setup_caps() */
WRITE_ONCE(dev->gso_ipv4_max_size, size);
}
static inline void netif_set_gro_ipv4_max_size(struct net_device *dev,
unsigned int size)
{
/* This pairs with the READ_ONCE() in skb_gro_receive() */
WRITE_ONCE(dev->gro_ipv4_max_size, size);
}
#endif

33
net/core/rtnetlink.c
View File

@ -1074,6 +1074,8 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
+ nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
+ nla_total_size(4) /* IFLA_GRO_MAX_SIZE */
+ nla_total_size(4) /* IFLA_GSO_IPV4_MAX_SIZE */
+ nla_total_size(4) /* IFLA_GRO_IPV4_MAX_SIZE */
+ nla_total_size(4) /* IFLA_TSO_MAX_SIZE */
+ nla_total_size(4) /* IFLA_TSO_MAX_SEGS */
+ nla_total_size(1) /* IFLA_OPERSTATE */
@ -1807,6 +1809,8 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) ||
nla_put_u32(skb, IFLA_GSO_IPV4_MAX_SIZE, dev->gso_ipv4_max_size) ||
nla_put_u32(skb, IFLA_GRO_IPV4_MAX_SIZE, dev->gro_ipv4_max_size) ||
nla_put_u32(skb, IFLA_TSO_MAX_SIZE, dev->tso_max_size) ||
nla_put_u32(skb, IFLA_TSO_MAX_SEGS, dev->tso_max_segs) ||
#ifdef CONFIG_RPS
@ -1968,6 +1972,8 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_TSO_MAX_SIZE] = { .type = NLA_REJECT },
[IFLA_TSO_MAX_SEGS] = { .type = NLA_REJECT },
[IFLA_ALLMULTI] = { .type = NLA_REJECT },
[IFLA_GSO_IPV4_MAX_SIZE] = { .type = NLA_U32 },
[IFLA_GRO_IPV4_MAX_SIZE] = { .type = NLA_U32 },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
@ -2883,6 +2889,29 @@ static int do_setlink(const struct sk_buff *skb,
}
}
if (tb[IFLA_GSO_IPV4_MAX_SIZE]) {
u32 max_size = nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]);
if (max_size > dev->tso_max_size) {
err = -EINVAL;
goto errout;
}
if (dev->gso_ipv4_max_size ^ max_size) {
netif_set_gso_ipv4_max_size(dev, max_size);
status |= DO_SETLINK_MODIFIED;
}
}
if (tb[IFLA_GRO_IPV4_MAX_SIZE]) {
u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]);
if (dev->gro_ipv4_max_size ^ gro_max_size) {
netif_set_gro_ipv4_max_size(dev, gro_max_size);
status |= DO_SETLINK_MODIFIED;
}
}
if (tb[IFLA_OPERSTATE])
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
@ -3325,6 +3354,10 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS]));
if (tb[IFLA_GRO_MAX_SIZE])
netif_set_gro_max_size(dev, nla_get_u32(tb[IFLA_GRO_MAX_SIZE]));
if (tb[IFLA_GSO_IPV4_MAX_SIZE])
netif_set_gso_ipv4_max_size(dev, nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]));
if (tb[IFLA_GRO_IPV4_MAX_SIZE])
netif_set_gro_ipv4_max_size(dev, nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]));
return dev;
}