Messages in this thread Patch in this message | | | From | Florian Fainelli <> | Subject | [PATCH net-next] net: dsa: Remove indirect function call for flow dissection | Date | Thu, 2 Jan 2020 15:36:53 -0800 |
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We only need "static" information to be given for DSA flow dissection, so replace the expensive call to .flow_dissect() with an integer giving us the offset into the packet array of bytes that we must de-reference to obtain the protocol number. The overhead was alreayd available from the dsa_device_ops structure so use that directly.
The presence of a flow_dissect callback used to indicate that the DSA tagger supported returning that information,we now encode this with a proto_off value of DSA_PROTO_OFF_UNPSEC if the tagger does not support providing that information yet.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> --- Changes since RFC:
- use a constant instead of the "magic" -1 - update all tag drivers and build test correctly
include/net/dsa.h | 5 +++-- net/core/flow_dissector.c | 15 ++++++++++----- net/dsa/tag_brcm.c | 2 ++ net/dsa/tag_dsa.c | 10 +--------- net/dsa/tag_edsa.c | 10 +--------- net/dsa/tag_gswip.c | 1 + net/dsa/tag_ksz.c | 3 +++ net/dsa/tag_lan9303.c | 1 + net/dsa/tag_mtk.c | 11 +---------- net/dsa/tag_ocelot.c | 1 + net/dsa/tag_qca.c | 11 +---------- net/dsa/tag_sja1105.c | 1 + 12 files changed, 26 insertions(+), 45 deletions(-)
diff --git a/include/net/dsa.h b/include/net/dsa.h index da5578db228e..5b77eb7eea02 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -68,18 +68,19 @@ enum dsa_tag_protocol { struct packet_type; struct dsa_switch; +#define DSA_PROTO_OFF_UNSPEC -1 + struct dsa_device_ops { struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev); struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); - int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto, - int *offset); /* Used to determine which traffic should match the DSA filter in * eth_type_trans, and which, if any, should bypass it and be processed * as regular on the master net device. */ bool (*filter)(const struct sk_buff *skb, struct net_device *dev); unsigned int overhead; + int proto_off; const char *name; enum dsa_tag_protocol proto; }; diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 2dbbb030fbed..1d8f1ecde51e 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -972,13 +972,18 @@ bool __skb_flow_dissect(const struct net *net, if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) && proto == htons(ETH_P_XDSA))) { const struct dsa_device_ops *ops; - int offset = 0; + unsigned int overhead; + int proto_off; ops = skb->dev->dsa_ptr->tag_ops; - if (ops->flow_dissect && - !ops->flow_dissect(skb, &proto, &offset)) { - hlen -= offset; - nhoff += offset; + overhead = ops->overhead; + proto_off = ops->proto_off; + if (likely(overhead && + proto_off != DSA_PROTO_OFF_UNSPEC && + proto_off < skb->len)) { + hlen -= overhead; + nhoff += overhead; + proto = ((__be16 *)skb->data)[proto_off]; } } #endif diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c index 9c3114179690..abc050e3c092 100644 --- a/net/dsa/tag_brcm.c +++ b/net/dsa/tag_brcm.c @@ -177,6 +177,7 @@ static const struct dsa_device_ops brcm_netdev_ops = { .xmit = brcm_tag_xmit, .rcv = brcm_tag_rcv, .overhead = BRCM_TAG_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; DSA_TAG_DRIVER(brcm_netdev_ops); @@ -205,6 +206,7 @@ static const struct dsa_device_ops brcm_prepend_netdev_ops = { .xmit = brcm_tag_xmit_prepend, .rcv = brcm_tag_rcv_prepend, .overhead = BRCM_TAG_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; DSA_TAG_DRIVER(brcm_prepend_netdev_ops); diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c index 7ddec9794477..4a970e959fef 100644 --- a/net/dsa/tag_dsa.c +++ b/net/dsa/tag_dsa.c @@ -142,21 +142,13 @@ static struct sk_buff *dsa_rcv(struct sk_buff *skb, struct net_device *dev, return skb; } -static int dsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto, - int *offset) -{ - *offset = 4; - *proto = ((__be16 *)skb->data)[1]; - return 0; -} - static const struct dsa_device_ops dsa_netdev_ops = { .name = "dsa", .proto = DSA_TAG_PROTO_DSA, .xmit = dsa_xmit, .rcv = dsa_rcv, - .flow_dissect = dsa_tag_flow_dissect, .overhead = DSA_HLEN, + .proto_off = 1, }; MODULE_LICENSE("GPL"); diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c index e8eaa804ccb9..c7cb0df17287 100644 --- a/net/dsa/tag_edsa.c +++ b/net/dsa/tag_edsa.c @@ -161,21 +161,13 @@ static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev, return skb; } -static int edsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto, - int *offset) -{ - *offset = 8; - *proto = ((__be16 *)skb->data)[3]; - return 0; -} - static const struct dsa_device_ops edsa_netdev_ops = { .name = "edsa", .proto = DSA_TAG_PROTO_EDSA, .xmit = edsa_xmit, .rcv = edsa_rcv, - .flow_dissect = edsa_tag_flow_dissect, .overhead = EDSA_HLEN, + .proto_off = 3, }; MODULE_LICENSE("GPL"); diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c index b678160bbd66..4161852d871d 100644 --- a/net/dsa/tag_gswip.c +++ b/net/dsa/tag_gswip.c @@ -109,6 +109,7 @@ static const struct dsa_device_ops gswip_netdev_ops = { .xmit = gswip_tag_xmit, .rcv = gswip_tag_rcv, .overhead = GSWIP_RX_HEADER_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; MODULE_LICENSE("GPL"); diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c index 90d055c4df9e..4c9576201963 100644 --- a/net/dsa/tag_ksz.c +++ b/net/dsa/tag_ksz.c @@ -123,6 +123,7 @@ static const struct dsa_device_ops ksz8795_netdev_ops = { .xmit = ksz8795_xmit, .rcv = ksz8795_rcv, .overhead = KSZ_INGRESS_TAG_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; DSA_TAG_DRIVER(ksz8795_netdev_ops); @@ -198,6 +199,7 @@ static const struct dsa_device_ops ksz9477_netdev_ops = { .xmit = ksz9477_xmit, .rcv = ksz9477_rcv, .overhead = KSZ9477_INGRESS_TAG_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; DSA_TAG_DRIVER(ksz9477_netdev_ops); @@ -236,6 +238,7 @@ static const struct dsa_device_ops ksz9893_netdev_ops = { .xmit = ksz9893_xmit, .rcv = ksz9477_rcv, .overhead = KSZ_INGRESS_TAG_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; DSA_TAG_DRIVER(ksz9893_netdev_ops); diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c index eb0e7a32e53d..16cdc2e4c050 100644 --- a/net/dsa/tag_lan9303.c +++ b/net/dsa/tag_lan9303.c @@ -134,6 +134,7 @@ static const struct dsa_device_ops lan9303_netdev_ops = { .xmit = lan9303_xmit, .rcv = lan9303_rcv, .overhead = LAN9303_TAG_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; MODULE_LICENSE("GPL"); diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c index b5705cba8318..c96354f12317 100644 --- a/net/dsa/tag_mtk.c +++ b/net/dsa/tag_mtk.c @@ -89,22 +89,13 @@ static struct sk_buff *mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev, return skb; } -static int mtk_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto, - int *offset) -{ - *offset = 4; - *proto = ((__be16 *)skb->data)[1]; - - return 0; -} - static const struct dsa_device_ops mtk_netdev_ops = { .name = "mtk", .proto = DSA_TAG_PROTO_MTK, .xmit = mtk_tag_xmit, .rcv = mtk_tag_rcv, - .flow_dissect = mtk_tag_flow_dissect, .overhead = MTK_HDR_LEN, + .proto_off = 1, }; MODULE_LICENSE("GPL"); diff --git a/net/dsa/tag_ocelot.c b/net/dsa/tag_ocelot.c index 8e3e7283d430..f9d9cc705caf 100644 --- a/net/dsa/tag_ocelot.c +++ b/net/dsa/tag_ocelot.c @@ -233,6 +233,7 @@ static struct dsa_device_ops ocelot_netdev_ops = { .xmit = ocelot_xmit, .rcv = ocelot_rcv, .overhead = OCELOT_TAG_LEN + OCELOT_LONG_PREFIX_LEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; MODULE_LICENSE("GPL v2"); diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c index c95885215525..87cf2b9f78ea 100644 --- a/net/dsa/tag_qca.c +++ b/net/dsa/tag_qca.c @@ -90,22 +90,13 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev, return skb; } -static int qca_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto, - int *offset) -{ - *offset = QCA_HDR_LEN; - *proto = ((__be16 *)skb->data)[0]; - - return 0; -} - static const struct dsa_device_ops qca_netdev_ops = { .name = "qca", .proto = DSA_TAG_PROTO_QCA, .xmit = qca_tag_xmit, .rcv = qca_tag_rcv, - .flow_dissect = qca_tag_flow_dissect, .overhead = QCA_HDR_LEN, + .proto_off = 0, }; MODULE_LICENSE("GPL"); diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c index 63ef2a14c934..9be591186638 100644 --- a/net/dsa/tag_sja1105.c +++ b/net/dsa/tag_sja1105.c @@ -300,6 +300,7 @@ static struct dsa_device_ops sja1105_netdev_ops = { .rcv = sja1105_rcv, .filter = sja1105_filter, .overhead = VLAN_HLEN, + .proto_off = DSA_PROTO_OFF_UNSPEC, }; MODULE_LICENSE("GPL v2"); -- 2.17.1
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