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Message-Id: <20200420200055.49033-7-dsahern@kernel.org>
Date: Mon, 20 Apr 2020 14:00:45 -0600
From: David Ahern <dsahern@...nel.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org,
prashantbhole.linux@...il.com, jasowang@...hat.com,
brouer@...hat.com, toke@...hat.com, toshiaki.makita1@...il.com,
daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
kafai@...com, songliubraving@...com, yhs@...com, andriin@...com,
dsahern@...il.com, David Ahern <dahern@...italocean.com>
Subject: [PATCH bpf-next 06/16] net: Add IFLA_XDP_EGRESS for XDP programs in the egress path
From: David Ahern <dahern@...italocean.com>
Running programs in the egress path, on skbs or xdp_frames, does not
require driver specific resources like Rx path. Accordingly, the
programs can be run in core code, so add xdp_egress_prog to net_device
to hold a reference to an attached program.
For UAPI, add IFLA_XDP_EGRESS to if_link.h to specify egress programs,
add a new attach flag, XDP_ATTACHED_EGRESS_CORE, to denote the
attach point is at the core level (as opposed to driver or hardware)
and add IFLA_XDP_EGRESS_CORE_PROG_ID for reporting the program id.
Add egress argument to do_setlink_xdp to denote processing of
IFLA_XDP_EGRESS versus IFLA_XDP, and add a check that none of the
existing modes (SKB, DRV or HW) are set since those modes are not
valid. The expectation is that XDP_FLAGS_HW_MODE will be used later
(e.g., offloading guest programs).
Add rtnl_xdp_egress_fill and helpers as the egress counterpart to the
existing rtnl_xdp_fill.
Signed-off-by: David Ahern <dahern@...italocean.com>
---
include/linux/netdevice.h | 1 +
include/uapi/linux/if_link.h | 3 +
net/core/rtnetlink.c | 96 ++++++++++++++++++++++++++++--
tools/include/uapi/linux/if_link.h | 3 +
4 files changed, 99 insertions(+), 4 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d0bb9e09660a..3133247681fd 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1995,6 +1995,7 @@ struct net_device {
unsigned int real_num_rx_queues;
struct bpf_prog __rcu *xdp_prog;
+ struct bpf_prog __rcu *xdp_egress_prog;
unsigned long gro_flush_timeout;
rx_handler_func_t __rcu *rx_handler;
void __rcu *rx_handler_data;
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 127c704eeba9..b3c6cb2f0f0a 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -170,6 +170,7 @@ enum {
IFLA_PROP_LIST,
IFLA_ALT_IFNAME, /* Alternative ifname */
IFLA_PERM_ADDRESS,
+ IFLA_XDP_EGRESS, /* nested attribute with 1 or more IFLA_XDP_ attrs */
__IFLA_MAX
};
@@ -988,6 +989,7 @@ enum {
XDP_ATTACHED_SKB,
XDP_ATTACHED_HW,
XDP_ATTACHED_MULTI,
+ XDP_ATTACHED_EGRESS_CORE,
};
enum {
@@ -1000,6 +1002,7 @@ enum {
IFLA_XDP_SKB_PROG_ID,
IFLA_XDP_HW_PROG_ID,
IFLA_XDP_EXPECTED_FD,
+ IFLA_XDP_EGRESS_CORE_PROG_ID,
__IFLA_XDP_MAX,
};
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index dc44af16226a..e9bc5cee06c8 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1030,7 +1030,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
+ nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
+ nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
- + rtnl_xdp_size() /* IFLA_XDP */
+ + rtnl_xdp_size() * 2 /* IFLA_XDP and IFLA_XDP_EGRESS */
+ nla_total_size(4) /* IFLA_EVENT */
+ nla_total_size(4) /* IFLA_NEW_NETNSID */
+ nla_total_size(4) /* IFLA_NEW_IFINDEX */
@@ -1395,6 +1395,42 @@ static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
return 0;
}
+static u32 rtnl_xdp_egress_prog(struct net_device *dev)
+{
+ const struct bpf_prog *prog;
+
+ ASSERT_RTNL();
+
+ prog = rtnl_dereference(dev->xdp_egress_prog);
+ if (!prog)
+ return 0;
+ return prog->aux->id;
+}
+
+static int rtnl_xdp_egress_report(struct sk_buff *skb, struct net_device *dev,
+ u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
+ u32 (*get_prog_id)(struct net_device *dev))
+{
+ u32 curr_id;
+ int err;
+
+ curr_id = get_prog_id(dev);
+ if (!curr_id)
+ return 0;
+
+ *prog_id = curr_id;
+ err = nla_put_u32(skb, attr, curr_id);
+ if (err)
+ return err;
+
+ if (*mode != XDP_ATTACHED_NONE)
+ *mode = XDP_ATTACHED_MULTI;
+ else
+ *mode = tgt_mode;
+
+ return 0;
+}
+
static u32 rtnl_xdp_prog_skb(struct net_device *dev)
{
const struct bpf_prog *generic_xdp_prog;
@@ -1486,6 +1522,42 @@ static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
return err;
}
+static int rtnl_xdp_egress_fill(struct sk_buff *skb, struct net_device *dev)
+{
+ u8 mode = XDP_ATTACHED_NONE;
+ struct nlattr *xdp;
+ u32 prog_id = 0;
+ int err;
+
+ xdp = nla_nest_start_noflag(skb, IFLA_XDP_EGRESS);
+ if (!xdp)
+ return -EMSGSIZE;
+
+ err = rtnl_xdp_egress_report(skb, dev, &prog_id, &mode,
+ XDP_ATTACHED_EGRESS_CORE,
+ IFLA_XDP_EGRESS_CORE_PROG_ID,
+ rtnl_xdp_egress_prog);
+ if (err)
+ goto err_cancel;
+
+ err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
+ if (err)
+ goto err_cancel;
+
+ if (prog_id && mode != XDP_ATTACHED_MULTI) {
+ err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
+ if (err)
+ goto err_cancel;
+ }
+
+ nla_nest_end(skb, xdp);
+ return 0;
+
+err_cancel:
+ nla_nest_cancel(skb, xdp);
+ return err;
+}
+
static u32 rtnl_get_event(unsigned long event)
{
u32 rtnl_event_type = IFLA_EVENT_NONE;
@@ -1743,6 +1815,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
if (rtnl_xdp_fill(skb, dev))
goto nla_put_failure;
+ if (rtnl_xdp_egress_fill(skb, dev))
+ goto nla_put_failure;
+
if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
if (rtnl_link_fill(skb, dev) < 0)
goto nla_put_failure;
@@ -1827,6 +1902,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_ALT_IFNAME] = { .type = NLA_STRING,
.len = ALTIFNAMSIZ - 1 },
[IFLA_PERM_ADDRESS] = { .type = NLA_REJECT },
+ [IFLA_XDP_EGRESS] = { .type = NLA_NESTED },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
@@ -2482,7 +2558,8 @@ static int do_set_master(struct net_device *dev, int ifindex,
#define DO_SETLINK_NOTIFY 0x03
static int do_setlink_xdp(struct net_device *dev, struct nlattr *tb,
- int *status, struct netlink_ext_ack *extack)
+ int *status, bool egress,
+ struct netlink_ext_ack *extack)
{
struct nlattr *xdp[IFLA_XDP_MAX + 1];
u32 xdp_flags = 0;
@@ -2498,6 +2575,10 @@ static int do_setlink_xdp(struct net_device *dev, struct nlattr *tb,
if (xdp[IFLA_XDP_FLAGS]) {
xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
+ if (egress && xdp_flags & XDP_FLAGS_MODES) {
+ NL_SET_ERR_MSG(extack, "XDP_FLAGS_MODES not valid for egress");
+ goto out_einval;
+ }
if (xdp_flags & ~XDP_FLAGS_MASK)
goto out_einval;
if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1)
@@ -2515,7 +2596,7 @@ static int do_setlink_xdp(struct net_device *dev, struct nlattr *tb,
err = dev_change_xdp_fd(dev, extack,
nla_get_s32(xdp[IFLA_XDP_FD]),
- expected_fd, xdp_flags, false);
+ expected_fd, xdp_flags, egress);
if (err)
return err;
@@ -2821,7 +2902,14 @@ static int do_setlink(const struct sk_buff *skb,
}
if (tb[IFLA_XDP]) {
- err = do_setlink_xdp(dev, tb[IFLA_XDP], &status, extack);
+ err = do_setlink_xdp(dev, tb[IFLA_XDP], &status, false, extack);
+ if (err)
+ goto errout;
+ }
+
+ if (tb[IFLA_XDP_EGRESS]) {
+ err = do_setlink_xdp(dev, tb[IFLA_XDP_EGRESS], &status, true,
+ extack);
if (err)
goto errout;
}
diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/if_link.h
index ca6665ea758a..f9e665aa836a 100644
--- a/tools/include/uapi/linux/if_link.h
+++ b/tools/include/uapi/linux/if_link.h
@@ -170,6 +170,7 @@ enum {
IFLA_PROP_LIST,
IFLA_ALT_IFNAME, /* Alternative ifname */
IFLA_PERM_ADDRESS,
+ IFLA_XDP_EGRESS, /* nested attribute with 1 or more IFLA_XDP_ attrs */
__IFLA_MAX
};
@@ -976,6 +977,7 @@ enum {
XDP_ATTACHED_SKB,
XDP_ATTACHED_HW,
XDP_ATTACHED_MULTI,
+ XDP_ATTACHED_EGRESS_CORE,
};
enum {
@@ -988,6 +990,7 @@ enum {
IFLA_XDP_SKB_PROG_ID,
IFLA_XDP_HW_PROG_ID,
IFLA_XDP_EXPECTED_FD,
+ IFLA_XDP_EGRESS_CORE_PROG_ID,
__IFLA_XDP_MAX,
};
--
2.21.1 (Apple Git-122.3)
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