diff mbox

[v2,1/3] net: Add support for hardware-offloaded encapsulation

Message ID 1352709418-28996-2-git-send-email-joseph.gasparakis@intel.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Joseph Gasparakis Nov. 12, 2012, 8:36 a.m. UTC 
This patch adds support in the kernel for offloading in the NIC Tx and Rx checksumming for encapsulated packets (such as VXLAN and IP GRE)

Signed-off-by: Joseph Gasparakis <joseph.gasparakis@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
---
 Documentation/networking/netdev-features.txt |  10 +++
 include/linux/if_ether.h                     |   5 ++
 include/linux/ip.h                           |   5 ++
 include/linux/netdev_features.h              |   3 +
 include/linux/skbuff.h                       | 114 +++++++++++++++++++++++++++
 include/linux/udp.h                          |   5 ++
 net/core/ethtool.c                           |   2 +
 net/core/skbuff.c                            |  17 ++++
 8 files changed, 161 insertions(+)

Comments

saeed bishara Nov. 12, 2012, 12:31 p.m. UTC | #1 
> diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
> index 5ac3212..6dd59a5 100644
> --- a/include/linux/netdev_features.h
> +++ b/include/linux/netdev_features.h

>         NETIF_F_RXCSUM_BIT,             /* Receive checksumming offload */
> +       NETIF_F_RXCSUM_ENC_BIT,         /* Receive checksuming offload */
> +                                       /* for encapsulation */
in the future more features will be needed for tunneled packets (tso,
rxhash, etc..)
so I think it would make sense to add a new features variable for
tunneled packets, and the enum above will be used as is.
for example, if the driver supports checksum offloading for
encapsulated packets, then it will set the RXCSUM_BIT in that
variable:
netdev->encap_hw_features = NETIF_F_RXCSUM_BIT;
saeed
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diff mbox

Patch

diff --git a/Documentation/networking/netdev-features.txt b/Documentation/networking/netdev-features.txt
index 4164f5c..82695c0 100644
--- a/Documentation/networking/netdev-features.txt
+++ b/Documentation/networking/netdev-features.txt
@@ -165,3 +165,13 @@  This requests that the NIC receive all possible frames, including errored
 frames (such as bad FCS, etc).  This can be helpful when sniffing a link with
 bad packets on it.  Some NICs may receive more packets if also put into normal
 PROMISC mdoe.
+
+*  tx-enc-checksum-offload
+
+This feature implies that the NIC will be able to calculate the Tx checksums
+for both inner and outer packets in the case of vxlan and ipgre encapsulation.
+
+*  rx-enc-checksum-offload
+
+This feature implies that the NIC will be able to verify the Rx checksums
+for both inner and outer packets in the case of vxlan and ipgre encapsulation.
diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index 12b4d55..195376b 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -28,6 +28,11 @@  static inline struct ethhdr *eth_hdr(const struct sk_buff *skb)
 	return (struct ethhdr *)skb_mac_header(skb);
 }
 
+static inline struct ethhdr *eth_inner_hdr(const struct sk_buff *skb)
+{
+	return (struct ethhdr *)skb_inner_mac_header(skb);
+}
+
 int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
 
 int mac_pton(const char *s, u8 *mac);
diff --git a/include/linux/ip.h b/include/linux/ip.h
index 58b82a2..e084de7 100644
--- a/include/linux/ip.h
+++ b/include/linux/ip.h
@@ -25,6 +25,11 @@  static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
 	return (struct iphdr *)skb_network_header(skb);
 }
 
+static inline struct iphdr *ip_inner_hdr(const struct sk_buff *skb)
+{
+	return (struct iphdr *)skb_inner_network_header(skb);
+}
+
 static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
 {
 	return (struct iphdr *)skb_transport_header(skb);
diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 5ac3212..6dd59a5 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -19,6 +19,7 @@  enum {
 	NETIF_F_IP_CSUM_BIT,		/* Can checksum TCP/UDP over IPv4. */
 	__UNUSED_NETIF_F_1,
 	NETIF_F_HW_CSUM_BIT,		/* Can checksum all the packets. */
+	NETIF_F_HW_CSUM_ENC_BIT,	/* Can checksum all inner headers */
 	NETIF_F_IPV6_CSUM_BIT,		/* Can checksum TCP/UDP over IPV6 */
 	NETIF_F_HIGHDMA_BIT,		/* Can DMA to high memory. */
 	NETIF_F_FRAGLIST_BIT,		/* Scatter/gather IO. */
@@ -52,6 +53,8 @@  enum {
 	NETIF_F_NTUPLE_BIT,		/* N-tuple filters supported */
 	NETIF_F_RXHASH_BIT,		/* Receive hashing offload */
 	NETIF_F_RXCSUM_BIT,		/* Receive checksumming offload */
+	NETIF_F_RXCSUM_ENC_BIT,		/* Receive checksuming offload */
+					/* for encapsulation */
 	NETIF_F_NOCACHE_COPY_BIT,	/* Use no-cache copyfromuser */
 	NETIF_F_LOOPBACK_BIT,		/* Enable loopback */
 	NETIF_F_RXFCS_BIT,		/* Append FCS to skb pkt data */
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f2af494..4b9b50b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -379,6 +379,9 @@  typedef unsigned char *sk_buff_data_t;
  *	@transport_header: Transport layer header
  *	@network_header: Network layer header
  *	@mac_header: Link layer header
+ *	@inner_transport_header: Inner transport layer header (encapsulation)
+ *	@inner_network_header: Network layer header (encapsulation)
+ *	@inner_mac_header: Link layer header (encapsulation)
  *	@tail: Tail pointer
  *	@end: End pointer
  *	@head: Head of buffer
@@ -489,6 +492,9 @@  struct sk_buff {
 	sk_buff_data_t		transport_header;
 	sk_buff_data_t		network_header;
 	sk_buff_data_t		mac_header;
+	sk_buff_data_t		inner_transport_header;
+	sk_buff_data_t		inner_network_header;
+	sk_buff_data_t		inner_mac_header;
 	/* These elements must be at the end, see alloc_skb() for details.  */
 	sk_buff_data_t		tail;
 	sk_buff_data_t		end;
@@ -1441,6 +1447,63 @@  static inline void skb_reset_mac_len(struct sk_buff *skb)
 }
 
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
+static inline unsigned char *skb_inner_transport_header(const struct sk_buff
+							*skb)
+{
+	return skb->head + skb->inner_transport_header;
+}
+
+static inline void skb_reset_inner_transport_header(struct sk_buff *skb)
+{
+	skb->inner_transport_header = skb->data - skb->head;
+}
+
+static inline void skb_set_inner_transport_header(struct sk_buff *skb,
+						   const int offset)
+{
+	skb_reset_inner_transport_header(skb);
+	skb->inner_transport_header += offset;
+}
+
+static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb)
+{
+	return skb->head + skb->inner_network_header;
+}
+
+static inline void skb_reset_inner_network_header(struct sk_buff *skb)
+{
+	skb->inner_network_header = skb->data - skb->head;
+}
+
+static inline void skb_set_inner_network_header(struct sk_buff *skb,
+						const int offset)
+{
+	skb_reset_inner_network_header(skb);
+	skb->inner_network_header += offset;
+}
+
+static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb)
+{
+	return skb->head + skb->inner_mac_header;
+}
+
+static inline int skb_inner_mac_header_was_set(const struct sk_buff *skb)
+{
+	return skb->inner_mac_header != ~0U;
+}
+
+static inline void skb_reset_inner_mac_header(struct sk_buff *skb)
+{
+	skb->inner_mac_header = skb->data - skb->head;
+}
+
+static inline void skb_set_inner_mac_header(struct sk_buff *skb,
+					    const int offset)
+{
+	skb_reset_inner_mac_header(skb);
+	skb->inner_mac_header += offset;
+}
+
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 {
 	return skb->head + skb->transport_header;
@@ -1496,7 +1559,58 @@  static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
 }
 
 #else /* NET_SKBUFF_DATA_USES_OFFSET */
+static inline unsigned char *skb_inner_transport_header(const struct sk_buff
+							*skb)
+{
+	return skb->inner_transport_header;
+}
+
+static inline void skb_reset_inner_transport_header(struct sk_buff *skb)
+{
+	skb->inner_transport_header = skb->data;
+}
+
+static inline void skb_set_inner_transport_header(struct sk_buff *skb,
+						   const int offset)
+{
+	skb->inner_transport_header = skb->data + offset;
+}
+
+static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb)
+{
+	return skb->inner_network_header;
+}
+
+static inline void skb_reset_inner_network_header(struct sk_buff *skb)
+{
+	skb->inner_network_header = skb->data;
+}
+
+static inline void skb_set_inner_network_header(struct sk_buff *skb,
+						const int offset)
+{
+	skb->inner_network_header = skb->data + offset;
+}
+
+static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb)
+{
+	return skb->inner_mac_header;
+}
+
+static inline int skb_inner_mac_header_was_set(const struct sk_buff *skb)
+{
+	return skb->inner_mac_header != NULL;
+}
 
+static inline void skb_reset_mac_header(struct sk_buff *skb)
+{
+	skb->inner_mac_header = skb->data;
+}
+
+static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
+{
+	skb->inner_mac_header = skb->data + offset;
+}
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 {
 	return skb->transport_header;
diff --git a/include/linux/udp.h b/include/linux/udp.h
index 0b67d77..bd49c56 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -27,6 +27,11 @@  static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
 	return (struct udphdr *)skb_transport_header(skb);
 }
 
+static inline struct udphdr *udp_inner_hdr(const struct sk_buff *skb)
+{
+	return (struct udphdr *)skb_inner_transport_header(skb);
+}
+
 #define UDP_HTABLE_SIZE_MIN		(CONFIG_BASE_SMALL ? 128 : 256)
 
 static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 4d64cc2..11f928d 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -58,6 +58,7 @@  static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
 	[NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
 	[NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
 	[NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
+	[NETIF_F_HW_CSUM_ENC_BIT] =	 "tx-checksum-enc-offload",
 	[NETIF_F_HIGHDMA_BIT] =          "highdma",
 	[NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
 	[NETIF_F_HW_VLAN_TX_BIT] =       "tx-vlan-hw-insert",
@@ -84,6 +85,7 @@  static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
 	[NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
 	[NETIF_F_RXHASH_BIT] =           "rx-hashing",
 	[NETIF_F_RXCSUM_BIT] =           "rx-checksum",
+	[NETIF_F_RXCSUM_ENC_BIT] =	 "rx-enc-checksum-offload",
 	[NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
 	[NETIF_F_LOOPBACK_BIT] =         "loopback",
 	[NETIF_F_RXFCS_BIT] =            "rx-fcs",
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d9addea..4be312b 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -259,6 +259,7 @@  struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	skb->end = skb->tail + size;
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
 	skb->mac_header = ~0U;
+	skb->inner_mac_header = ~0U;
 #endif
 
 	/* make sure we initialize shinfo sequentially */
@@ -327,6 +328,7 @@  struct sk_buff *build_skb(void *data, unsigned int frag_size)
 	skb->end = skb->tail + size;
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
 	skb->mac_header = ~0U;
+	skb->inner_mac_header = ~0U;
 #endif
 
 	/* make sure we initialize shinfo sequentially */
@@ -682,6 +684,9 @@  static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 	new->transport_header	= old->transport_header;
 	new->network_header	= old->network_header;
 	new->mac_header		= old->mac_header;
+	new->inner_transport_header = old->inner_transport_header;
+	new->inner_network_header = old->inner_transport_header;
+	new->inner_mac_header = old->inner_mac_header;
 	skb_dst_copy(new, old);
 	new->rxhash		= old->rxhash;
 	new->ooo_okay		= old->ooo_okay;
@@ -892,6 +897,10 @@  static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 	new->network_header   += offset;
 	if (skb_mac_header_was_set(new))
 		new->mac_header	      += offset;
+	new->inner_transport_header += offset;
+	new->inner_network_header   += offset;
+	if (skb_inner_mac_header_was_set(new))
+		new->inner_mac_header += offset;
 #endif
 	skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
 	skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
@@ -1089,6 +1098,10 @@  int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 	skb->network_header   += off;
 	if (skb_mac_header_was_set(skb))
 		skb->mac_header += off;
+	skb->inner_transport_header += off;
+	skb->inner_network_header += off;
+	if (skb_inner_mac_header_was_set(skb))
+		skb->inner_mac_header += off;
 	/* Only adjust this if it actually is csum_start rather than csum */
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
 		skb->csum_start += nhead;
@@ -1188,6 +1201,10 @@  struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
 	n->network_header   += off;
 	if (skb_mac_header_was_set(skb))
 		n->mac_header += off;
+	n->inner_transport_header += off;
+	n->inner_network_header	   += off;
+	if (skb_inner_mac_header_was_set(skb))
+		n->inner_mac_header += off;
 #endif
 
 	return n;