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net/sched: Make etf report drops on error_queue 

Use the socket error queue for reporting dropped packets if the
socket has enabled that feature through the SO_TXTIME API.

Packets are dropped either on enqueue() if they aren't accepted by the
qdisc or on dequeue() if the system misses their deadline. Those are
reported as different errors so applications can react accordingly.

Userspace can retrieve the errors through the socket error queue and the
corresponding cmsg interfaces. A struct sock_extended_err* is used for
returning the error data, and the packet's timestamp can be retrieved by
adding both ee_data and ee_info fields as e.g.:

    ((__u64) serr->ee_data << 32) + serr->ee_info

This feature is disabled by default and must be explicitly enabled by
applications. Enabling it can bring some overhead for the Tx cycles
of the application.

Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesus Sanchez-Palencia 2018-07-03 15:43:00 -07:00 committed by David S. Miller
parent 3048cf84d1
commit 4b15c70753
5 changed files with 47 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/sock.h
View File

@ -481,7 +481,8 @@ struct sock {
u8 sk_clockid;
u8 sk_txtime_deadline_mode : 1,
sk_txtime_unused : 7;
sk_txtime_report_errors : 1,
sk_txtime_unused : 6;
struct socket *sk_socket;
void *sk_user_data;

4
include/uapi/linux/errqueue.h
View File

@ -20,12 +20,16 @@ struct sock_extended_err {
#define SO_EE_ORIGIN_ICMP6 3
#define SO_EE_ORIGIN_TXSTATUS 4
#define SO_EE_ORIGIN_ZEROCOPY 5
#define SO_EE_ORIGIN_TXTIME 6
#define SO_EE_ORIGIN_TIMESTAMPING SO_EE_ORIGIN_TXSTATUS
#define SO_EE_OFFENDER(ee) ((struct sockaddr*)((ee)+1))
#define SO_EE_CODE_ZEROCOPY_COPIED 1
#define SO_EE_CODE_TXTIME_INVALID_PARAM 1
#define SO_EE_CODE_TXTIME_MISSED 2
/**
* struct scm_timestamping - timestamps exposed through cmsg
*

5
include/uapi/linux/net_tstamp.h
View File

@ -147,8 +147,11 @@ struct scm_ts_pktinfo {
*/
enum txtime_flags {
SOF_TXTIME_DEADLINE_MODE = (1 << 0),
SOF_TXTIME_REPORT_ERRORS = (1 << 1),
SOF_TXTIME_FLAGS_MASK = (SOF_TXTIME_DEADLINE_MODE)
SOF_TXTIME_FLAGS_LAST = SOF_TXTIME_REPORT_ERRORS,
SOF_TXTIME_FLAGS_MASK = (SOF_TXTIME_FLAGS_LAST - 1) |
SOF_TXTIME_FLAGS_LAST
};
struct sock_txtime {

4
net/core/sock.c
View File

@ -1087,6 +1087,8 @@ set_rcvbuf:
sk->sk_clockid = sk_txtime.clockid;
sk->sk_txtime_deadline_mode =
!!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
sk->sk_txtime_report_errors =
!!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
}
break;
@ -1429,6 +1431,8 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.txtime.clockid = sk->sk_clockid;
v.txtime.flags |= sk->sk_txtime_deadline_mode ?
SOF_TXTIME_DEADLINE_MODE : 0;
v.txtime.flags |= sk->sk_txtime_report_errors ?
SOF_TXTIME_REPORT_ERRORS : 0;
break;
default:

35
net/sched/sch_etf.c
View File

@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/errqueue.h>
#include <linux/rbtree.h>
#include <linux/skbuff.h>
#include <linux/posix-timers.h>
@ -123,6 +124,32 @@ static void reset_watchdog(struct Qdisc *sch)
qdisc_watchdog_schedule_ns(&q->watchdog, ktime_to_ns(next));
}
static void report_sock_error(struct sk_buff *skb, u32 err, u8 code)
{
struct sock_exterr_skb *serr;
struct sk_buff *clone;
ktime_t txtime = skb->tstamp;
if (!skb->sk || !(skb->sk->sk_txtime_report_errors))
return;
clone = skb_clone(skb, GFP_ATOMIC);
if (!clone)
return;
serr = SKB_EXT_ERR(clone);
serr->ee.ee_errno = err;
serr->ee.ee_origin = SO_EE_ORIGIN_TXTIME;
serr->ee.ee_type = 0;
serr->ee.ee_code = code;
serr->ee.ee_pad = 0;
serr->ee.ee_data = (txtime >> 32); /* high part of tstamp */
serr->ee.ee_info = txtime; /* low part of tstamp */
if (sock_queue_err_skb(skb->sk, clone))
kfree_skb(clone);
}
static int etf_enqueue_timesortedlist(struct sk_buff *nskb, struct Qdisc *sch,
struct sk_buff **to_free)
{
@ -130,8 +157,11 @@ static int etf_enqueue_timesortedlist(struct sk_buff *nskb, struct Qdisc *sch,
struct rb_node **p = &q->head.rb_node, *parent = NULL;
ktime_t txtime = nskb->tstamp;
if (!is_packet_valid(sch, nskb))
if (!is_packet_valid(sch, nskb)) {
report_sock_error(nskb, EINVAL,
SO_EE_CODE_TXTIME_INVALID_PARAM);
return qdisc_drop(nskb, sch, to_free);
}
while (*p) {
struct sk_buff *skb;
@ -174,6 +204,8 @@ static void timesortedlist_erase(struct Qdisc *sch, struct sk_buff *skb,
if (drop) {
struct sk_buff *to_free = NULL;
report_sock_error(skb, ECANCELED, SO_EE_CODE_TXTIME_MISSED);
qdisc_drop(skb, sch, &to_free);
kfree_skb_list(to_free);
qdisc_qstats_overlimit(sch);
@ -199,7 +231,6 @@ static struct sk_buff *etf_dequeue_timesortedlist(struct Qdisc *sch)
now = q->get_time();
/* Drop if packet has expired while in queue. */
/* FIXME: Must return error on the socket's error queue */
if (ktime_before(skb->tstamp, now)) {
timesortedlist_erase(sch, skb, true);
skb = NULL;