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net-tc: convert tc_verd to integer bitfields

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Extract the remaining two fields from tc_verd and remove the __u16
completely. TC_AT and TC_FROM are converted to equivalent two-bit
integer fields tc_at and tc_from. Where possible, use existing
helper skb_at_tc_ingress when reading tc_at. Introduce helper
skb_reset_tc to clear fields.

Not documenting tc_from and tc_at, because they will be replaced
with single bit fields in follow-on patches.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn
2017-01-07 17:06:36 -05:00
committed by David S. Miller
parent e7246e122a
commit a5135bcfba
11 changed files with 29 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/core/dev.c
+4 -6
View File
@@ -3153,7 +3153,7 @@ sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
if (!cl)
return skb;
/* skb->tc_verd and qdisc_skb_cb(skb)->pkt_len were already set
/* skb->tc_at and qdisc_skb_cb(skb)->pkt_len were already set
* earlier by the caller.
*/
qdisc_bstats_cpu_update(cl->q, skb);
@@ -3320,7 +3320,7 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
qdisc_pkt_len_init(skb);
#ifdef CONFIG_NET_CLS_ACT
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
skb->tc_at = AT_EGRESS;
# ifdef CONFIG_NET_EGRESS
if (static_key_false(&egress_needed)) {
skb = sch_handle_egress(skb, &rc, dev);
@@ -3920,7 +3920,7 @@ sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
}
qdisc_skb_cb(skb)->pkt_len = skb->len;
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
skb->tc_at = AT_INGRESS;
qdisc_bstats_cpu_update(cl->q, skb);
switch (tc_classify(skb, cl, &cl_res, false)) {
@@ -4122,9 +4122,7 @@ skip_taps:
goto out;
}
#endif
#ifdef CONFIG_NET_CLS_ACT
skb->tc_verd = 0;
#endif
skb_reset_tc(skb);
skip_classify:
if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
goto drop;
net/core/pktgen.c
+1 -3
View File
@@ -3439,9 +3439,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
/* skb was 'freed' by stack, so clean few
* bits and reuse it
*/
#ifdef CONFIG_NET_CLS_ACT
skb->tc_verd = 0; /* reset reclass/redir ttl */
#endif
skb_reset_tc(skb);
} while (--burst > 0);
goto out; /* Skips xmit_mode M_START_XMIT */
} else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
net/core/skbuff.c
-3
View File
@@ -878,9 +878,6 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
#endif
#ifdef CONFIG_NET_SCHED
CHECK_SKB_FIELD(tc_index);
#ifdef CONFIG_NET_CLS_ACT
CHECK_SKB_FIELD(tc_verd);
#endif
#endif
}
net/sched/act_ife.c
+3 -4
View File
@@ -736,12 +736,11 @@ static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
u16 metalen = ife_get_sz(skb, ife);
int hdrm = metalen + skb->dev->hard_header_len + IFE_METAHDRLEN;
unsigned int skboff = skb->dev->hard_header_len;
u32 at = G_TC_AT(skb->tc_verd);
int new_len = skb->len + hdrm;
bool exceed_mtu = false;
int err;
if (at & AT_EGRESS) {
if (!skb_at_tc_ingress(skb)) {
if (new_len > skb->dev->mtu)
exceed_mtu = true;
}
@@ -773,7 +772,7 @@ static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
return TC_ACT_SHOT;
}
if (!(at & AT_EGRESS))
if (skb_at_tc_ingress(skb))
skb_push(skb, skb->dev->hard_header_len);
iethh = (struct ethhdr *)skb->data;
@@ -816,7 +815,7 @@ static int tcf_ife_encode(struct sk_buff *skb, const struct tc_action *a,
ether_addr_copy(oethh->h_dest, iethh->h_dest);
oethh->h_proto = htons(ife->eth_type);
if (!(at & AT_EGRESS))
if (skb_at_tc_ingress(skb))
skb_pull(skb, skb->dev->hard_header_len);
spin_unlock(&ife->tcf_lock);
net/sched/act_mirred.c
+4 -5
View File
@@ -170,7 +170,6 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
int retval, err = 0;
int m_eaction;
int mac_len;
u32 at;
tcf_lastuse_update(&m->tcf_tm);
bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);
@@ -191,7 +190,6 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
goto out;
}
at = G_TC_AT(skb->tc_verd);
skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2)
goto out;
@@ -200,8 +198,9 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
* and devices expect a mac header on xmit, then mac push/pull is
* needed.
*/
if (at != tcf_mirred_act_direction(m_eaction) && m_mac_header_xmit) {
if (at & AT_EGRESS) {
if (skb->tc_at != tcf_mirred_act_direction(m_eaction) &&
m_mac_header_xmit) {
if (!skb_at_tc_ingress(skb)) {
/* caught at egress, act ingress: pull mac */
mac_len = skb_network_header(skb) - skb_mac_header(skb);
skb_pull_rcsum(skb2, mac_len);
@@ -213,7 +212,7 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
/* mirror is always swallowed */
if (tcf_mirred_is_act_redirect(m_eaction))
skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
skb2->tc_from = skb2->tc_at;
skb2->skb_iif = skb->dev->ifindex;
skb2->dev = dev;
net/sched/sch_netem.c
+1 -1
View File
@@ -626,7 +626,7 @@ deliver:
* If it's at ingress let's pretend the delay is
* from the network (tstamp will be updated).
*/
if (G_TC_FROM(skb->tc_verd) & AT_INGRESS)
if (skb->tc_from & AT_INGRESS)
skb->tstamp = 0;
#endif