From 164d8c6665213c931645578310256da7b1259331 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Fri, 28 Mar 2014 18:58:22 +0100 Subject: [PATCH] net: ptp: do not reimplement PTP/BPF classifier 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 Signed-off-by: Alexei Starovoitov Cc: Richard Cochran Cc: Jiri Benc Signed-off-by: David S. Miller --- drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c | 11 +---------- drivers/net/ethernet/ti/cpts.c | 10 +--------- drivers/net/ethernet/xscale/ixp4xx_eth.c | 11 +---------- include/linux/ptp_classify.h | 10 ++-------- net/core/timestamping.c | 8 +++++++- 5 files changed, 12 insertions(+), 38 deletions(-) diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c index 464e91058c81..73e66838cfef 100644 --- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c +++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c @@ -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; diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c index 372cb192c5aa..a3bbf59eaafd 100644 --- a/drivers/net/ethernet/ti/cpts.c +++ b/drivers/net/ethernet/ti/cpts.c @@ -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)) { diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c index 25283f17d82f..f7e0f0f7c2e2 100644 --- a/drivers/net/ethernet/xscale/ixp4xx_eth.c +++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c @@ -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; diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h index 3decfa4d3732..6d3b0a2ef9ce 100644 --- a/include/linux/ptp_classify.h +++ b/include/linux/ptp_classify.h @@ -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 diff --git a/net/core/timestamping.c b/net/core/timestamping.c index e43d56acf803..9ff26b3cc021 100644 --- a/net/core/timestamping.c +++ b/net/core/timestamping.c @@ -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; } -- 2.30.2