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packet: account statistics only in tpacket_stats_u

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Currently, packet_sock has a struct tpacket_stats stats member for
TPACKET_V1 and TPACKET_V2 statistic accounting, and with TPACKET_V3
``union tpacket_stats_u stats_u'' was introduced, where however only
statistics for TPACKET_V3 are held, and when copied to user space,
TPACKET_V3 does some hackery and access also tpacket_stats' stats,
although everything could have been done within the union itself.

Unify accounting within the tpacket_stats_u union so that we can
remove 8 bytes from packet_sock that are there unnecessary. Note that
even if we switch to TPACKET_V3 and would use non mmap(2)ed option,
this still works due to the union with same types + offsets, that are
exposed to the user space.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-04-19 06:12:29 +00:00 committed by David S. Miller
parent 0578edc560
commit ee80fbf301
2 changed files with 17 additions and 23 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

37
net/packet/af_packet.c
View file

@ -528,7 +528,7 @@ static void init_prb_bdqc(struct packet_sock *po,
p1->hdrlen = po->tp_hdrlen;
p1->version = po->tp_version;
p1->last_kactive_blk_num = 0;
po->stats_u.stats3.tp_freeze_q_cnt = 0;
po->stats.stats3.tp_freeze_q_cnt = 0;
if (req_u->req3.tp_retire_blk_tov)
p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
else
@ -696,7 +696,7 @@ static void prb_close_block(struct tpacket_kbdq_core *pkc1,
struct tpacket3_hdr *last_pkt;
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
if (po->stats.tp_drops)
if (po->stats.stats3.tp_drops)
status |= TP_STATUS_LOSING;
last_pkt = (struct tpacket3_hdr *)pkc1->prev;
@ -801,7 +801,7 @@ static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
struct packet_sock *po)
{
pkc->reset_pending_on_curr_blk = 1;
po->stats_u.stats3.tp_freeze_q_cnt++;
po->stats.stats3.tp_freeze_q_cnt++;
}
#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
@ -1687,7 +1687,7 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
nf_reset(skb);
spin_lock(&sk->sk_receive_queue.lock);
po->stats.tp_packets++;
po->stats.stats1.tp_packets++;
skb->dropcount = atomic_read(&sk->sk_drops);
__skb_queue_tail(&sk->sk_receive_queue, skb);
spin_unlock(&sk->sk_receive_queue.lock);
@ -1696,7 +1696,7 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
drop_n_acct:
spin_lock(&sk->sk_receive_queue.lock);
po->stats.tp_drops++;
po->stats.stats1.tp_drops++;
atomic_inc(&sk->sk_drops);
spin_unlock(&sk->sk_receive_queue.lock);
@ -1796,10 +1796,10 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
* Anyways, moving it for V1/V2 only as V3 doesn't need this
* at packet level.
*/
if (po->stats.tp_drops)
if (po->stats.stats1.tp_drops)
status |= TP_STATUS_LOSING;
}
po->stats.tp_packets++;
po->stats.stats1.tp_packets++;
if (copy_skb) {
status |= TP_STATUS_COPY;
__skb_queue_tail(&sk->sk_receive_queue, copy_skb);
@ -1898,7 +1898,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
return 0;
ring_is_full:
po->stats.tp_drops++;
po->stats.stats1.tp_drops++;
spin_unlock(&sk->sk_receive_queue.lock);
sk->sk_data_ready(sk, 0);
@ -3247,8 +3247,7 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
struct sock *sk = sock->sk;
struct packet_sock *po = pkt_sk(sk);
void *data = &val;
struct tpacket_stats st;
union tpacket_stats_u st_u;
union tpacket_stats_u st;
if (level != SOL_PACKET)
return -ENOPROTOOPT;
@ -3262,22 +3261,18 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
switch (optname) {
case PACKET_STATISTICS:
spin_lock_bh(&sk->sk_receive_queue.lock);
memcpy(&st, &po->stats, sizeof(st));
memset(&po->stats, 0, sizeof(po->stats));
spin_unlock_bh(&sk->sk_receive_queue.lock);
if (po->tp_version == TPACKET_V3) {
lv = sizeof(struct tpacket_stats_v3);
memcpy(&st_u.stats3, &po->stats,
sizeof(struct tpacket_stats));
st_u.stats3.tp_freeze_q_cnt =
po->stats_u.stats3.tp_freeze_q_cnt;
st_u.stats3.tp_packets += po->stats.tp_drops;
data = &st_u.stats3;
data = &st.stats3;
} else {
lv = sizeof(struct tpacket_stats);
st = po->stats;
st.tp_packets += st.tp_drops;
data = &st;
data = &st.stats1;
}
memset(&po->stats, 0, sizeof(st));
spin_unlock_bh(&sk->sk_receive_queue.lock);
break;
case PACKET_AUXDATA:
val = po->auxdata;

3
net/packet/internal.h
View file

@ -93,8 +93,7 @@ struct packet_sock {
/* struct sock has to be the first member of packet_sock */
struct sock sk;
struct packet_fanout *fanout;
struct tpacket_stats stats;
union tpacket_stats_u stats_u;
union tpacket_stats_u stats;
struct packet_ring_buffer rx_ring;
struct packet_ring_buffer tx_ring;
int copy_thresh;