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net-tc: convert tc_verd to integer bitfields 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/ifb.c
View File

@ -78,9 +78,9 @@ static void ifb_ri_tasklet(unsigned long _txp)
}
while ((skb = __skb_dequeue(&txp->tq)) != NULL) {
u32 from = G_TC_FROM(skb->tc_verd);
u32 from = skb->tc_from;
skb->tc_verd = 0;
skb_reset_tc(skb);
skb->tc_skip_classify = 1;
u64_stats_update_begin(&txp->tsync);
@ -239,7 +239,6 @@ static void ifb_setup(struct net_device *dev)
static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ifb_dev_private *dp = netdev_priv(dev);
u32 from = G_TC_FROM(skb->tc_verd);
struct ifb_q_private *txp = dp->tx_private + skb_get_queue_mapping(skb);
u64_stats_update_begin(&txp->rsync);
@ -247,7 +246,7 @@ static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
txp->rx_bytes += skb->len;
u64_stats_update_end(&txp->rsync);
if (!(from & (AT_INGRESS|AT_EGRESS)) || !skb->skb_iif) {
if (skb->tc_from == AT_STACK || !skb->skb_iif) {
dev_kfree_skb(skb);
dev->stats.rx_dropped++;
return NETDEV_TX_OK;

5
drivers/staging/octeon/ethernet-tx.c
View File

@ -23,6 +23,7 @@
#endif /* CONFIG_XFRM */
#include <linux/atomic.h>
#include <net/sch_generic.h>
#include <asm/octeon/octeon.h>
@ -369,9 +370,7 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
#ifdef CONFIG_NET_SCHED
skb->tc_index = 0;
#ifdef CONFIG_NET_CLS_ACT
skb->tc_verd = 0;
#endif /* CONFIG_NET_CLS_ACT */
skb_reset_tc(skb);
#endif /* CONFIG_NET_SCHED */
#endif /* REUSE_SKBUFFS_WITHOUT_FREE */

6
include/linux/skbuff.h
View File

@ -599,7 +599,6 @@ static inline bool skb_mstamp_after(const struct skb_mstamp *t1,
* @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
* @skb_iif: ifindex of device we arrived on
* @tc_index: Traffic control index
* @tc_verd: traffic control verdict
* @hash: the packet hash
* @queue_mapping: Queue mapping for multiqueue devices
* @xmit_more: More SKBs are pending for this queue
@ -752,13 +751,12 @@ struct sk_buff {
#endif
#ifdef CONFIG_NET_CLS_ACT
__u8 tc_skip_classify:1;
__u8 tc_at:2;
__u8 tc_from:2;
#endif
#ifdef CONFIG_NET_SCHED
__u16 tc_index; /* traffic control index */
#ifdef CONFIG_NET_CLS_ACT
__u16 tc_verd; /* traffic control verdict */
#endif
#endif
union {

10
include/net/sch_generic.h
View File

@ -409,10 +409,18 @@ bool tcf_destroy(struct tcf_proto *tp, bool force);
void tcf_destroy_chain(struct tcf_proto __rcu **fl);
int skb_do_redirect(struct sk_buff *);
static inline void skb_reset_tc(struct sk_buff *skb)
{
#ifdef CONFIG_NET_CLS_ACT
skb->tc_at = 0;
skb->tc_from = 0;
#endif
}
static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
{
#ifdef CONFIG_NET_CLS_ACT
return G_TC_AT(skb->tc_verd) & AT_INGRESS;
return skb->tc_at & AT_INGRESS;
#else
return false;
#endif

31
include/uapi/linux/pkt_cls.h
View File

@ -5,40 +5,9 @@
#include <linux/pkt_sched.h>
#ifdef __KERNEL__
/* I think i could have done better macros ; for now this is stolen from
* some arch/mips code - jhs
*/
#define _TC_MAKE32(x) ((x))
#define _TC_MAKEMASK1(n) (_TC_MAKE32(1) << _TC_MAKE32(n))
#define _TC_MAKEMASK(v,n) (_TC_MAKE32((_TC_MAKE32(1)<<(v))-1) << _TC_MAKE32(n))
#define _TC_MAKEVALUE(v,n) (_TC_MAKE32(v) << _TC_MAKE32(n))
#define _TC_GETVALUE(v,n,m) ((_TC_MAKE32(v) & _TC_MAKE32(m)) >> _TC_MAKE32(n))
/* verdict bit breakdown
*
bit 6,7: Where this packet was last seen
0: Above the transmit example at the socket level
1: on the Ingress
2: on the Egress
*
* */
#define S_TC_FROM _TC_MAKE32(6)
#define M_TC_FROM _TC_MAKEMASK(2,S_TC_FROM)
#define G_TC_FROM(x) _TC_GETVALUE(x,S_TC_FROM,M_TC_FROM)
#define V_TC_FROM(x) _TC_MAKEVALUE(x,S_TC_FROM)
#define SET_TC_FROM(v,n) ((V_TC_FROM(n)) | (v & ~M_TC_FROM))
#define AT_STACK 0x0
#define AT_INGRESS 0x1
#define AT_EGRESS 0x2
#define S_TC_AT _TC_MAKE32(12)
#define M_TC_AT _TC_MAKEMASK(2,S_TC_AT)
#define G_TC_AT(x) _TC_GETVALUE(x,S_TC_AT,M_TC_AT)
#define V_TC_AT(x) _TC_MAKEVALUE(x,S_TC_AT)
#define SET_TC_AT(v,n) ((V_TC_AT(n)) | (v & ~M_TC_AT))
#endif
/* Action attributes */

10
net/core/dev.c
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;

4
net/core/pktgen.c
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) {

3
net/core/skbuff.c
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
}

7
net/sched/act_ife.c
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);

9
net/sched/act_mirred.c
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;

2
net/sched/sch_netem.c
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