From: Stanislav Fomichev <sdf@google.com>
To: bpf@vger.kernel.org
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, kuba@kernel.org,
toke@kernel.org, willemb@google.com, dsahern@kernel.org,
magnus.karlsson@intel.com, bjorn@kernel.org,
maciej.fijalkowski@intel.com, hawk@kernel.org,
yoong.siang.song@intel.com, netdev@vger.kernel.org,
xdp-hints@xdp-project.net
Subject: [PATCH bpf-next v3 02/10] xsk: add TX timestamp and TX checksum offload support
Date: Tue, 3 Oct 2023 13:05:14 -0700 [thread overview]
Message-ID: <20231003200522.1914523-3-sdf@google.com> (raw)
In-Reply-To: <20231003200522.1914523-1-sdf@google.com>
This change actually defines the (initial) metadata layout
that should be used by AF_XDP userspace (xsk_tx_metadata).
The first field is flags which requests appropriate offloads,
followed by the offload-specific fields. The supported per-device
offloads are exported via netlink (new xsk-flags).
The offloads themselves are still implemented in a bit of a
framework-y fashion that's left from my initial kfunc attempt.
I'm introducing new xsk_tx_metadata_ops which drivers are
supposed to implement. The drivers are also supposed
to call xsk_tx_metadata_request/xsk_tx_metadata_complete in
the right places. Since xsk_tx_metadata_{request,_complete}
are static inline, we don't incur any extra overhead doing
indirect calls.
The benefit of this scheme is as follows:
- keeps all metadata layout parsing away from driver code
- makes it easy to grep and see which drivers implement what
- don't need any extra flags to maintain to keep track of what
offloads are implemented; if the callback is implemented - the offload
is supported (used by netlink reporting code)
Two offloads are defined right now:
1. XDP_TX_METADATA_CHECKSUM: skb-style csum_start+csum_offset
2. XDP_TX_METADATA_TIMESTAMP: writes TX timestamp back into metadata
area upon completion (tx_timestamp field)
The offloads are also implemented for copy mode:
1. Extra XDP_TX_METADATA_CHECKSUM_SW to trigger skb_checksum_help; this
might be useful as a reference implementation and for testing
2. XDP_TX_METADATA_TIMESTAMP writes SW timestamp from the skb
destructor (note I'm reusing hwtstamps to pass metadata pointer)
The struct is forward-compatible and can be extended in the future
by appending more fields.
Signed-off-by: Stanislav Fomichev <sdf@google.com>
---
Documentation/netlink/specs/netdev.yaml | 19 ++++++
include/linux/netdevice.h | 27 +++++++++
include/linux/skbuff.h | 14 ++++-
include/net/xdp_sock.h | 80 +++++++++++++++++++++++++
include/net/xdp_sock_drv.h | 13 ++++
include/net/xsk_buff_pool.h | 6 ++
include/uapi/linux/if_xdp.h | 40 +++++++++++++
include/uapi/linux/netdev.h | 16 +++++
net/core/netdev-genl.c | 12 +++-
net/xdp/xsk.c | 39 ++++++++++++
net/xdp/xsk_queue.h | 2 +-
tools/include/uapi/linux/if_xdp.h | 54 +++++++++++++++--
tools/include/uapi/linux/netdev.h | 16 +++++
tools/net/ynl/generated/netdev-user.c | 19 ++++++
tools/net/ynl/generated/netdev-user.h | 3 +
15 files changed, 352 insertions(+), 8 deletions(-)
diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index c46fcc78fc04..3735c26c8646 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -55,6 +55,19 @@ name: netdev
name: hash
doc:
Device is capable of exposing receive packet hash via bpf_xdp_metadata_rx_hash().
+ -
+ type: flags
+ name: xsk-flags
+ render-max: true
+ entries:
+ -
+ name: tx-timestamp
+ doc:
+ HW timestamping egress packets is supported by the driver.
+ -
+ name: tx-checksum
+ doc:
+ L3 checksum HW offload is supported by the driver.
attribute-sets:
-
@@ -88,6 +101,11 @@ name: netdev
type: u64
enum: xdp-rx-metadata
enum-as-flags: true
+ -
+ name: xsk-features
+ doc: Bitmask of enabled AF_XDP features.
+ type: u64
+ enum: xsk-flags
operations:
list:
@@ -105,6 +123,7 @@ name: netdev
- xdp-features
- xdp-zc-max-segs
- xdp-rx-metadata-features
+ - xsk-features
dump:
reply: *dev-all
-
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7e520c14eb8c..0e1cb026cbe5 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1650,6 +1650,31 @@ struct net_device_ops {
struct netlink_ext_ack *extack);
};
+/*
+ * This structure defines the AF_XDP TX metadata hooks for network devices.
+ * The following hooks can be defined; unless noted otherwise, they are
+ * optional and can be filled with a null pointer.
+ *
+ * int (*tmo_request_timestamp)(void *priv)
+ * This function is called when AF_XDP frame requested egress timestamp.
+ *
+ * int (*tmo_fill_timestamp)(void *priv)
+ * This function is called when AF_XDP frame, that had requested
+ * egress timestamp, received a completion. The hook needs to return
+ * the actual HW timestamp.
+ *
+ * int (*tmo_request_checksum)(u16 csum_start, u16 csum_offset, void *priv)
+ * This function is called when AF_XDP frame requested HW checksum
+ * offload. csum_start indicates position where checksumming should start.
+ * csum_offset indicates position where checksum should be stored.
+ *
+ */
+struct xsk_tx_metadata_ops {
+ void (*tmo_request_timestamp)(void *priv);
+ u64 (*tmo_fill_timestamp)(void *priv);
+ void (*tmo_request_checksum)(u16 csum_start, u16 csum_offset, void *priv);
+};
+
/**
* enum netdev_priv_flags - &struct net_device priv_flags
*
@@ -1838,6 +1863,7 @@ enum netdev_ml_priv_type {
* @netdev_ops: Includes several pointers to callbacks,
* if one wants to override the ndo_*() functions
* @xdp_metadata_ops: Includes pointers to XDP metadata callbacks.
+ * @xsk_tx_metadata_ops: Includes pointers to AF_XDP TX metadata callbacks.
* @ethtool_ops: Management operations
* @l3mdev_ops: Layer 3 master device operations
* @ndisc_ops: Includes callbacks for different IPv6 neighbour
@@ -2097,6 +2123,7 @@ struct net_device {
unsigned long long priv_flags;
const struct net_device_ops *netdev_ops;
const struct xdp_metadata_ops *xdp_metadata_ops;
+ const struct xsk_tx_metadata_ops *xsk_tx_metadata_ops;
int ifindex;
unsigned short gflags;
unsigned short hard_header_len;
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4174c4b82d13..444d35dcd690 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -566,6 +566,15 @@ struct ubuf_info_msgzc {
int mm_account_pinned_pages(struct mmpin *mmp, size_t size);
void mm_unaccount_pinned_pages(struct mmpin *mmp);
+/* Preserve some data across TX submission and completion.
+ *
+ * Note, this state is stored in the driver. Extending the layout
+ * might need some special care.
+ */
+struct xsk_tx_metadata_compl {
+ __u64 *tx_timestamp;
+};
+
/* This data is invariant across clones and lives at
* the end of the header data, ie. at skb->end.
*/
@@ -578,7 +587,10 @@ struct skb_shared_info {
/* Warning: this field is not always filled in (UFO)! */
unsigned short gso_segs;
struct sk_buff *frag_list;
- struct skb_shared_hwtstamps hwtstamps;
+ union {
+ struct skb_shared_hwtstamps hwtstamps;
+ struct xsk_tx_metadata_compl xsk_meta;
+ };
unsigned int gso_type;
u32 tskey;
diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
index caa1f04106be..29427a69784d 100644
--- a/include/net/xdp_sock.h
+++ b/include/net/xdp_sock.h
@@ -92,6 +92,74 @@ int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
void __xsk_map_flush(void);
+/**
+ * xsk_tx_metadata_to_compl - Save enough relevant metadata information
+ * to perform tx completion in the future.
+ * @meta: pointer to AF_XDP metadata area
+ * @compl: pointer to output struct xsk_tx_metadata_to_compl
+ *
+ * This function should be called by the networking device when
+ * it prepares AF_XDP egress packet. The value of @compl should be stored
+ * and passed to xsk_tx_metadata_complete upon TX completion.
+ */
+static inline void xsk_tx_metadata_to_compl(struct xsk_tx_metadata *meta,
+ struct xsk_tx_metadata_compl *compl)
+{
+ if (!meta)
+ return;
+
+ if (meta->flags & XDP_TX_METADATA_TIMESTAMP)
+ compl->tx_timestamp = &meta->completion.tx_timestamp;
+ else
+ compl->tx_timestamp = NULL;
+}
+
+/**
+ * xsk_tx_metadata_request - Evaluate AF_XDP TX metadata at submission
+ * and call appropriate xsk_tx_metadata_ops operation.
+ * @meta: pointer to AF_XDP metadata area
+ * @ops: pointer to struct xsk_tx_metadata_ops
+ * @priv: pointer to driver-private aread
+ *
+ * This function should be called by the networking device when
+ * it prepares AF_XDP egress packet.
+ */
+static inline void xsk_tx_metadata_request(const struct xsk_tx_metadata *meta,
+ const struct xsk_tx_metadata_ops *ops,
+ void *priv)
+{
+ if (!meta)
+ return;
+
+ if (ops->tmo_request_timestamp)
+ if (meta->flags & XDP_TX_METADATA_TIMESTAMP)
+ ops->tmo_request_timestamp(priv);
+
+ if (ops->tmo_request_checksum)
+ if (meta->flags & XDP_TX_METADATA_CHECKSUM)
+ ops->tmo_request_checksum(meta->csum_start, meta->csum_offset, priv);
+}
+
+/**
+ * xsk_tx_metadata_complete - Evaluate AF_XDP TX metadata at completion
+ * and call appropriate xsk_tx_metadata_ops operation.
+ * @compl: pointer to completion metadata produced from xsk_tx_metadata_to_compl
+ * @ops: pointer to struct xsk_tx_metadata_ops
+ * @priv: pointer to driver-private aread
+ *
+ * This function should be called by the networking device upon
+ * AF_XDP egress completion.
+ */
+static inline void xsk_tx_metadata_complete(struct xsk_tx_metadata_compl *compl,
+ const struct xsk_tx_metadata_ops *ops,
+ void *priv)
+{
+ if (!compl)
+ return;
+
+ *compl->tx_timestamp = ops->tmo_fill_timestamp(priv);
+}
+
#else
static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
@@ -108,6 +176,18 @@ static inline void __xsk_map_flush(void)
{
}
+static inline void xsk_tx_metadata_request(struct xsk_tx_metadata *meta,
+ const struct xsk_tx_metadata_ops *ops,
+ void *priv)
+{
+}
+
+static inline void xsk_tx_metadata_complete(struct xsk_tx_metadata_compl *compl,
+ const struct xsk_tx_metadata_ops *ops,
+ void *priv)
+{
+}
+
#endif /* CONFIG_XDP_SOCKETS */
#endif /* _LINUX_XDP_SOCK_H */
diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
index 1f6fc8c7a84c..e2558ac3e195 100644
--- a/include/net/xdp_sock_drv.h
+++ b/include/net/xdp_sock_drv.h
@@ -165,6 +165,14 @@ static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
return xp_raw_get_data(pool, addr);
}
+static inline struct xsk_tx_metadata *xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr)
+{
+ if (!pool->tx_metadata_len)
+ return NULL;
+
+ return xp_raw_get_data(pool, addr) - pool->tx_metadata_len;
+}
+
static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
@@ -324,6 +332,11 @@ static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
return NULL;
}
+static inline struct xsk_tx_metadata *xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr)
+{
+ return NULL;
+}
+
static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
{
}
diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h
index 1985ffaf9b0c..97f5cc10d79e 100644
--- a/include/net/xsk_buff_pool.h
+++ b/include/net/xsk_buff_pool.h
@@ -33,6 +33,7 @@ struct xdp_buff_xsk {
};
#define XSK_CHECK_PRIV_TYPE(t) BUILD_BUG_ON(sizeof(t) > offsetofend(struct xdp_buff_xsk, cb))
+#define XSK_TX_COMPL_FITS(t) BUILD_BUG_ON(sizeof(struct xsk_tx_metadata_compl) > sizeof(t))
struct xsk_dma_map {
dma_addr_t *dma_pages;
@@ -234,4 +235,9 @@ static inline u64 xp_get_handle(struct xdp_buff_xsk *xskb)
return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
}
+static inline bool xp_tx_metadata_enabled(const struct xsk_buff_pool *pool)
+{
+ return pool->tx_metadata_len > 0;
+}
+
#endif /* XSK_BUFF_POOL_H_ */
diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h
index 2ecf79282c26..ecfd67988283 100644
--- a/include/uapi/linux/if_xdp.h
+++ b/include/uapi/linux/if_xdp.h
@@ -106,6 +106,43 @@ struct xdp_options {
#define XSK_UNALIGNED_BUF_ADDR_MASK \
((1ULL << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1)
+/* Request transmit timestamp. Upon completion, put it into tx_timestamp
+ * field of struct xsk_tx_metadata.
+ */
+#define XDP_TX_METADATA_TIMESTAMP (1 << 0)
+
+/* Request transmit checksum offload. Checksum start position and offset
+ * are communicated via csum_start and csum_offset fields of struct
+ * xsk_tx_metadata.
+ */
+#define XDP_TX_METADATA_CHECKSUM (1 << 1)
+
+/* Force checksum calculation in software. Can be used for testing or
+ * working around potential HW issues. This option causes performance
+ * degradation and only works in XDP_COPY mode.
+ */
+#define XDP_TX_METADATA_CHECKSUM_SW (1 << 2)
+
+struct xsk_tx_metadata {
+ union {
+ struct {
+ __u32 flags;
+
+ /* XDP_TX_METADATA_CHECKSUM */
+
+ /* Offset from desc->addr where checksumming should start. */
+ __u16 csum_start;
+ /* Offset from csum_start where checksum should be stored. */
+ __u16 csum_offset;
+ };
+
+ struct {
+ /* XDP_TX_METADATA_TIMESTAMP */
+ __u64 tx_timestamp;
+ } completion;
+ };
+};
+
/* Rx/Tx descriptor */
struct xdp_desc {
__u64 addr;
@@ -122,4 +159,7 @@ struct xdp_desc {
*/
#define XDP_PKT_CONTD (1 << 0)
+/* TX packet carries valid metadata. */
+#define XDP_TX_METADATA (1 << 1)
+
#endif /* _LINUX_IF_XDP_H */
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 2943a151d4f1..48d5477a668c 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -53,12 +53,28 @@ enum netdev_xdp_rx_metadata {
NETDEV_XDP_RX_METADATA_MASK = 3,
};
+/**
+ * enum netdev_xsk_flags
+ * @NETDEV_XSK_FLAGS_TX_TIMESTAMP: HW timestamping egress packets is supported
+ * by the driver.
+ * @NETDEV_XSK_FLAGS_TX_CHECKSUM: L3 checksum HW offload is supported by the
+ * driver.
+ */
+enum netdev_xsk_flags {
+ NETDEV_XSK_FLAGS_TX_TIMESTAMP = 1,
+ NETDEV_XSK_FLAGS_TX_CHECKSUM = 2,
+
+ /* private: */
+ NETDEV_XSK_FLAGS_MASK = 3,
+};
+
enum {
NETDEV_A_DEV_IFINDEX = 1,
NETDEV_A_DEV_PAD,
NETDEV_A_DEV_XDP_FEATURES,
NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
+ NETDEV_A_DEV_XSK_FEATURES,
__NETDEV_A_DEV_MAX,
NETDEV_A_DEV_MAX = (__NETDEV_A_DEV_MAX - 1)
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index fe61f85bcf33..5d889c2425fd 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -14,6 +14,7 @@ netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info)
{
u64 xdp_rx_meta = 0;
+ u64 xsk_features = 0;
void *hdr;
hdr = genlmsg_iput(rsp, info);
@@ -26,11 +27,20 @@ netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
+ if (netdev->xsk_tx_metadata_ops) {
+ if (netdev->xsk_tx_metadata_ops->tmo_fill_timestamp)
+ xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP;
+ if (netdev->xsk_tx_metadata_ops->tmo_request_checksum)
+ xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM;
+ }
+
if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES,
netdev->xdp_features, NETDEV_A_DEV_PAD) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
- xdp_rx_meta, NETDEV_A_DEV_PAD)) {
+ xdp_rx_meta, NETDEV_A_DEV_PAD) ||
+ nla_put_u64_64bit(rsp, NETDEV_A_DEV_XSK_FEATURES,
+ xsk_features, NETDEV_A_DEV_PAD)) {
genlmsg_cancel(rsp, hdr);
return -EINVAL;
}
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index c1e12b602213..c427e02c13eb 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -543,6 +543,13 @@ static u32 xsk_get_num_desc(struct sk_buff *skb)
static void xsk_destruct_skb(struct sk_buff *skb)
{
+ struct xsk_tx_metadata_compl *compl = &skb_shinfo(skb)->xsk_meta;
+
+ if (compl->tx_timestamp) {
+ /* sw completion timestamp, not a real one */
+ *compl->tx_timestamp = ktime_get_tai_fast_ns();
+ }
+
xsk_cq_submit_locked(xdp_sk(skb->sk), xsk_get_num_desc(skb));
sock_wfree(skb);
}
@@ -627,8 +634,10 @@ static struct sk_buff *xsk_build_skb_zerocopy(struct xdp_sock *xs,
static struct sk_buff *xsk_build_skb(struct xdp_sock *xs,
struct xdp_desc *desc)
{
+ struct xsk_tx_metadata *meta = NULL;
struct net_device *dev = xs->dev;
struct sk_buff *skb = xs->skb;
+ bool first_frag = false;
int err;
if (dev->priv_flags & IFF_TX_SKB_NO_LINEAR) {
@@ -659,6 +668,8 @@ static struct sk_buff *xsk_build_skb(struct xdp_sock *xs,
kfree_skb(skb);
goto free_err;
}
+
+ first_frag = true;
} else {
int nr_frags = skb_shinfo(skb)->nr_frags;
struct page *page;
@@ -681,12 +692,40 @@ static struct sk_buff *xsk_build_skb(struct xdp_sock *xs,
skb_add_rx_frag(skb, nr_frags, page, 0, len, 0);
}
+
+ if (first_frag && desc->options & XDP_TX_METADATA) {
+ if (unlikely(xs->pool->tx_metadata_len == 0)) {
+ err = -EINVAL;
+ goto free_err;
+ }
+
+ meta = buffer - xs->pool->tx_metadata_len;
+
+ if (meta->flags & XDP_TX_METADATA_CHECKSUM) {
+ if (unlikely(meta->csum_start + meta->csum_offset +
+ sizeof(__sum16) > len)) {
+ err = -EINVAL;
+ goto free_err;
+ }
+
+ skb->csum_start = hr + meta->csum_start;
+ skb->csum_offset = meta->csum_offset;
+ skb->ip_summed = CHECKSUM_PARTIAL;
+
+ if (unlikely(meta->flags & XDP_TX_METADATA_CHECKSUM_SW)) {
+ err = skb_checksum_help(skb);
+ if (err)
+ goto free_err;
+ }
+ }
+ }
}
skb->dev = dev;
skb->priority = xs->sk.sk_priority;
skb->mark = READ_ONCE(xs->sk.sk_mark);
skb->destructor = xsk_destruct_skb;
+ xsk_tx_metadata_to_compl(meta, &skb_shinfo(skb)->xsk_meta);
xsk_set_destructor_arg(skb);
return skb;
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index c74a1372bcb9..6f2d1621c992 100644
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h
@@ -137,7 +137,7 @@ static inline bool xskq_cons_read_addr_unchecked(struct xsk_queue *q, u64 *addr)
static inline bool xp_unused_options_set(u32 options)
{
- return options & ~XDP_PKT_CONTD;
+ return options & ~(XDP_PKT_CONTD | XDP_TX_METADATA);
}
static inline bool xp_aligned_validate_desc(struct xsk_buff_pool *pool,
diff --git a/tools/include/uapi/linux/if_xdp.h b/tools/include/uapi/linux/if_xdp.h
index 34411a2e5b6c..53ceaae10dd1 100644
--- a/tools/include/uapi/linux/if_xdp.h
+++ b/tools/include/uapi/linux/if_xdp.h
@@ -26,11 +26,11 @@
*/
#define XDP_USE_NEED_WAKEUP (1 << 3)
/* By setting this option, userspace application indicates that it can
- * handle multiple descriptors per packet thus enabling xsk core to split
+ * handle multiple descriptors per packet thus enabling AF_XDP to split
* multi-buffer XDP frames into multiple Rx descriptors. Without this set
- * such frames will be dropped by xsk.
+ * such frames will be dropped.
*/
-#define XDP_USE_SG (1 << 4)
+#define XDP_USE_SG (1 << 4)
/* Flags for xsk_umem_config flags */
#define XDP_UMEM_UNALIGNED_CHUNK_FLAG (1 << 0)
@@ -106,6 +106,43 @@ struct xdp_options {
#define XSK_UNALIGNED_BUF_ADDR_MASK \
((1ULL << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1)
+/* Request transmit timestamp. Upon completion, put it into tx_timestamp
+ * field of union xsk_tx_metadata.
+ */
+#define XDP_TX_METADATA_TIMESTAMP (1 << 0)
+
+/* Request transmit checksum offload. Checksum start position and offset
+ * are communicated via csum_start and csum_offset fields of union
+ * xsk_tx_metadata.
+ */
+#define XDP_TX_METADATA_CHECKSUM (1 << 1)
+
+/* Force checksum calculation in software. Can be used for testing or
+ * working around potential HW issues. This option causes performance
+ * degradation and only works in XDP_COPY mode.
+ */
+#define XDP_TX_METADATA_CHECKSUM_SW (1 << 2)
+
+struct xsk_tx_metadata {
+ union {
+ struct {
+ __u32 flags;
+
+ /* XDP_TX_METADATA_CHECKSUM */
+
+ /* Offset from desc->addr where checksumming should start. */
+ __u16 csum_start;
+ /* Offset from csum_start where checksum should be stored. */
+ __u16 csum_offset;
+ };
+
+ struct {
+ /* XDP_TX_METADATA_TIMESTAMP */
+ __u64 tx_timestamp;
+ } completion;
+ };
+};
+
/* Rx/Tx descriptor */
struct xdp_desc {
__u64 addr;
@@ -113,9 +150,16 @@ struct xdp_desc {
__u32 options;
};
-/* Flag indicating packet constitutes of multiple buffers*/
+/* UMEM descriptor is __u64 */
+
+/* Flag indicating that the packet continues with the buffer pointed out by the
+ * next frame in the ring. The end of the packet is signalled by setting this
+ * bit to zero. For single buffer packets, every descriptor has 'options' set
+ * to 0 and this maintains backward compatibility.
+ */
#define XDP_PKT_CONTD (1 << 0)
-/* UMEM descriptor is __u64 */
+/* TX packet carries valid metadata. */
+#define XDP_TX_METADATA (1 << 1)
#endif /* _LINUX_IF_XDP_H */
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 2943a151d4f1..48d5477a668c 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -53,12 +53,28 @@ enum netdev_xdp_rx_metadata {
NETDEV_XDP_RX_METADATA_MASK = 3,
};
+/**
+ * enum netdev_xsk_flags
+ * @NETDEV_XSK_FLAGS_TX_TIMESTAMP: HW timestamping egress packets is supported
+ * by the driver.
+ * @NETDEV_XSK_FLAGS_TX_CHECKSUM: L3 checksum HW offload is supported by the
+ * driver.
+ */
+enum netdev_xsk_flags {
+ NETDEV_XSK_FLAGS_TX_TIMESTAMP = 1,
+ NETDEV_XSK_FLAGS_TX_CHECKSUM = 2,
+
+ /* private: */
+ NETDEV_XSK_FLAGS_MASK = 3,
+};
+
enum {
NETDEV_A_DEV_IFINDEX = 1,
NETDEV_A_DEV_PAD,
NETDEV_A_DEV_XDP_FEATURES,
NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
+ NETDEV_A_DEV_XSK_FEATURES,
__NETDEV_A_DEV_MAX,
NETDEV_A_DEV_MAX = (__NETDEV_A_DEV_MAX - 1)
diff --git a/tools/net/ynl/generated/netdev-user.c b/tools/net/ynl/generated/netdev-user.c
index b5ffe8cd1144..6283d87dad37 100644
--- a/tools/net/ynl/generated/netdev-user.c
+++ b/tools/net/ynl/generated/netdev-user.c
@@ -58,6 +58,19 @@ const char *netdev_xdp_rx_metadata_str(enum netdev_xdp_rx_metadata value)
return netdev_xdp_rx_metadata_strmap[value];
}
+static const char * const netdev_xsk_flags_strmap[] = {
+ [0] = "tx-timestamp",
+ [1] = "tx-checksum",
+};
+
+const char *netdev_xsk_flags_str(enum netdev_xsk_flags value)
+{
+ value = ffs(value) - 1;
+ if (value < 0 || value >= (int)MNL_ARRAY_SIZE(netdev_xsk_flags_strmap))
+ return NULL;
+ return netdev_xsk_flags_strmap[value];
+}
+
/* Policies */
struct ynl_policy_attr netdev_dev_policy[NETDEV_A_DEV_MAX + 1] = {
[NETDEV_A_DEV_IFINDEX] = { .name = "ifindex", .type = YNL_PT_U32, },
@@ -65,6 +78,7 @@ struct ynl_policy_attr netdev_dev_policy[NETDEV_A_DEV_MAX + 1] = {
[NETDEV_A_DEV_XDP_FEATURES] = { .name = "xdp-features", .type = YNL_PT_U64, },
[NETDEV_A_DEV_XDP_ZC_MAX_SEGS] = { .name = "xdp-zc-max-segs", .type = YNL_PT_U32, },
[NETDEV_A_DEV_XDP_RX_METADATA_FEATURES] = { .name = "xdp-rx-metadata-features", .type = YNL_PT_U64, },
+ [NETDEV_A_DEV_XSK_FEATURES] = { .name = "xsk-features", .type = YNL_PT_U64, },
};
struct ynl_policy_nest netdev_dev_nest = {
@@ -116,6 +130,11 @@ int netdev_dev_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
return MNL_CB_ERROR;
dst->_present.xdp_rx_metadata_features = 1;
dst->xdp_rx_metadata_features = mnl_attr_get_u64(attr);
+ } else if (type == NETDEV_A_DEV_XSK_FEATURES) {
+ if (ynl_attr_validate(yarg, attr))
+ return MNL_CB_ERROR;
+ dst->_present.xsk_features = 1;
+ dst->xsk_features = mnl_attr_get_u64(attr);
}
}
diff --git a/tools/net/ynl/generated/netdev-user.h b/tools/net/ynl/generated/netdev-user.h
index b4351ff34595..bdbd1766ce46 100644
--- a/tools/net/ynl/generated/netdev-user.h
+++ b/tools/net/ynl/generated/netdev-user.h
@@ -19,6 +19,7 @@ extern const struct ynl_family ynl_netdev_family;
const char *netdev_op_str(int op);
const char *netdev_xdp_act_str(enum netdev_xdp_act value);
const char *netdev_xdp_rx_metadata_str(enum netdev_xdp_rx_metadata value);
+const char *netdev_xsk_flags_str(enum netdev_xsk_flags value);
/* Common nested types */
/* ============== NETDEV_CMD_DEV_GET ============== */
@@ -50,12 +51,14 @@ struct netdev_dev_get_rsp {
__u32 xdp_features:1;
__u32 xdp_zc_max_segs:1;
__u32 xdp_rx_metadata_features:1;
+ __u32 xsk_features:1;
} _present;
__u32 ifindex;
__u64 xdp_features;
__u32 xdp_zc_max_segs;
__u64 xdp_rx_metadata_features;
+ __u64 xsk_features;
};
void netdev_dev_get_rsp_free(struct netdev_dev_get_rsp *rsp);
--
2.42.0.582.g8ccd20d70d-goog
next prev parent reply other threads:[~2023-10-03 20:05 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-03 20:05 [PATCH bpf-next v3 00/10] xsk: TX metadata Stanislav Fomichev
2023-10-03 20:05 ` [PATCH bpf-next v3 01/10] xsk: Support tx_metadata_len Stanislav Fomichev
2023-10-03 20:05 ` Stanislav Fomichev [this message]
2023-10-04 6:18 ` [PATCH bpf-next v3 02/10] xsk: add TX timestamp and TX checksum offload support Song, Yoong Siang
2023-10-04 17:48 ` Stanislav Fomichev
2023-10-04 17:56 ` Stanislav Fomichev
2023-10-05 1:16 ` Song, Yoong Siang
2023-10-03 20:05 ` [PATCH bpf-next v3 03/10] tools: ynl: print xsk-features from the sample Stanislav Fomichev
2023-10-03 20:05 ` [PATCH bpf-next v3 04/10] net/mlx5e: Implement AF_XDP TX timestamp and checksum offload Stanislav Fomichev
2023-10-04 23:47 ` kernel test robot
2023-10-03 20:05 ` [PATCH bpf-next v3 05/10] net: stmmac: Add Tx HWTS support to XDP ZC Stanislav Fomichev
2023-10-04 23:05 ` kernel test robot
2023-10-04 23:14 ` Stanislav Fomichev
2023-10-06 4:38 ` kernel test robot
2023-10-03 20:05 ` [PATCH bpf-next v3 06/10] selftests/xsk: Support tx_metadata_len Stanislav Fomichev
2023-10-03 20:05 ` [PATCH bpf-next v3 07/10] selftests/bpf: Add csum helpers Stanislav Fomichev
2023-10-03 20:05 ` [PATCH bpf-next v3 08/10] selftests/bpf: Add TX side to xdp_metadata Stanislav Fomichev
2023-10-03 20:05 ` [PATCH bpf-next v3 09/10] selftests/bpf: Add TX side to xdp_hw_metadata Stanislav Fomichev
2023-10-09 8:12 ` Jesper Dangaard Brouer
2023-10-09 16:37 ` Stanislav Fomichev
2023-10-10 20:40 ` Stanislav Fomichev
2023-10-13 1:13 ` Song, Yoong Siang
2023-10-13 18:47 ` Stanislav Fomichev
2023-10-15 13:28 ` Song, Yoong Siang
2023-10-03 20:05 ` [PATCH bpf-next v3 10/10] xsk: document tx_metadata_len layout Stanislav Fomichev
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