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net: ptp: do not reimplement PTP/BPF classifier

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There are currently pch_gbe, cpts, and ixp4xx_eth drivers that open-code
and reimplement a BPF classifier for the PTP protocol. Since all of them
effectively do the very same thing and load the very same PTP/BPF filter,
we can just consolidate that code by introducing ptp_classify_raw() in
the time-stamping core framework which can be used in drivers.

As drivers get initialized after bootstrapping the core networking
subsystem, they can make use of ptp_insns wrapped through
ptp_classify_raw(), which allows to simplify and remove PTP classifier
setup code in drivers.

Joint work with Alexei Starovoitov.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Richard Cochran <richard.cochran@omicron.at>
Cc: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2014-03-28 18:58:22 +01:00 committed by David S. Miller
parent e62d2df084
commit 164d8c6665
5 changed files with 12 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
View File

@ -120,10 +120,6 @@ static void pch_gbe_mdio_write(struct net_device *netdev, int addr, int reg,
int data);
static void pch_gbe_set_multi(struct net_device *netdev);
static struct sock_filter ptp_filter[] = {
PTP_FILTER
};
static int pch_ptp_match(struct sk_buff *skb, u16 uid_hi, u32 uid_lo, u16 seqid)
{
u8 *data = skb->data;
@ -131,7 +127,7 @@ static int pch_ptp_match(struct sk_buff *skb, u16 uid_hi, u32 uid_lo, u16 seqid)
u16 *hi, *id;
u32 lo;
if (sk_run_filter(skb, ptp_filter) == PTP_CLASS_NONE)
if (ptp_classify_raw(skb) == PTP_CLASS_NONE)
return 0;
offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
@ -2635,11 +2631,6 @@ static int pch_gbe_probe(struct pci_dev *pdev,
adapter->ptp_pdev = pci_get_bus_and_slot(adapter->pdev->bus->number,
PCI_DEVFN(12, 4));
if (ptp_filter_init(ptp_filter, ARRAY_SIZE(ptp_filter))) {
dev_err(&pdev->dev, "Bad ptp filter\n");
ret = -EINVAL;
goto err_free_netdev;
}
netdev->netdev_ops = &pch_gbe_netdev_ops;
netdev->watchdog_timeo = PCH_GBE_WATCHDOG_PERIOD;

10
drivers/net/ethernet/ti/cpts.c
View File

@ -31,10 +31,6 @@
#ifdef CONFIG_TI_CPTS
static struct sock_filter ptp_filter[] = {
PTP_FILTER
};
#define cpts_read32(c, r) __raw_readl(&c->reg->r)
#define cpts_write32(c, v, r) __raw_writel(v, &c->reg->r)
@ -301,7 +297,7 @@ static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff *skb, int ev_type)
u64 ns = 0;
struct cpts_event *event;
struct list_head *this, *next;
unsigned int class = sk_run_filter(skb, ptp_filter);
unsigned int class = ptp_classify_raw(skb);
unsigned long flags;
u16 seqid;
u8 mtype;
@ -372,10 +368,6 @@ int cpts_register(struct device *dev, struct cpts *cpts,
int err, i;
unsigned long flags;
if (ptp_filter_init(ptp_filter, ARRAY_SIZE(ptp_filter))) {
pr_err("cpts: bad ptp filter\n");
return -EINVAL;
}
cpts->info = cpts_info;
cpts->clock = ptp_clock_register(&cpts->info, dev);
if (IS_ERR(cpts->clock)) {

11
drivers/net/ethernet/xscale/ixp4xx_eth.c
View File

@ -256,10 +256,6 @@ static int ports_open;
static struct port *npe_port_tab[MAX_NPES];
static struct dma_pool *dma_pool;
static struct sock_filter ptp_filter[] = {
PTP_FILTER
};
static int ixp_ptp_match(struct sk_buff *skb, u16 uid_hi, u32 uid_lo, u16 seqid)
{
u8 *data = skb->data;
@ -267,7 +263,7 @@ static int ixp_ptp_match(struct sk_buff *skb, u16 uid_hi, u32 uid_lo, u16 seqid)
u16 *hi, *id;
u32 lo;
if (sk_run_filter(skb, ptp_filter) != PTP_CLASS_V1_IPV4)
if (ptp_classify_raw(skb) != PTP_CLASS_V1_IPV4)
return 0;
offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
@ -1413,11 +1409,6 @@ static int eth_init_one(struct platform_device *pdev)
char phy_id[MII_BUS_ID_SIZE + 3];
int err;
if (ptp_filter_init(ptp_filter, ARRAY_SIZE(ptp_filter))) {
pr_err("ixp4xx_eth: bad ptp filter\n");
return -EINVAL;
}
if (!(dev = alloc_etherdev(sizeof(struct port))))
return -ENOMEM;

10
include/linux/ptp_classify.h
View File

@ -80,14 +80,6 @@
#define OP_RETA (BPF_RET | BPF_A)
#define OP_RETK (BPF_RET | BPF_K)
static inline int ptp_filter_init(struct sock_filter *f, int len)
{
if (OP_LDH == f[0].code)
return sk_chk_filter(f, len);
else
return 0;
}
#define PTP_FILTER \
{OP_LDH, 0, 0, OFF_ETYPE }, /* */ \
{OP_JEQ, 0, 12, ETH_P_IP }, /* f goto L20 */ \
@ -133,4 +125,6 @@ static inline int ptp_filter_init(struct sock_filter *f, int len)
{OP_RETA, 0, 0, 0 }, /* */ \
/*L6x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE },
unsigned int ptp_classify_raw(const struct sk_buff *skb);
#endif

8
net/core/timestamping.c
View File

@ -25,11 +25,17 @@
static struct sk_filter *ptp_insns __read_mostly;
unsigned int ptp_classify_raw(const struct sk_buff *skb)
{
return SK_RUN_FILTER(ptp_insns, skb);
}
EXPORT_SYMBOL_GPL(ptp_classify_raw);
static unsigned int classify(const struct sk_buff *skb)
{
if (likely(skb->dev && skb->dev->phydev &&
skb->dev->phydev->drv))
return SK_RUN_FILTER(ptp_insns, skb);
return ptp_classify_raw(skb);
else
return PTP_CLASS_NONE;
}