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Date: Tue, 5 Dec 2023 22:08:34 +0100
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: bpf@...r.kernel.org
Cc: Larysa Zaremba <larysa.zaremba@...el.com>,
ast@...nel.org,
daniel@...earbox.net,
andrii@...nel.org,
martin.lau@...ux.dev,
song@...nel.org,
yhs@...com,
john.fastabend@...il.com,
kpsingh@...nel.org,
sdf@...gle.com,
haoluo@...gle.com,
jolsa@...nel.org,
David Ahern <dsahern@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Willem de Bruijn <willemb@...gle.com>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Anatoly Burakov <anatoly.burakov@...el.com>,
Alexander Lobakin <alexandr.lobakin@...el.com>,
Magnus Karlsson <magnus.karlsson@...il.com>,
Maryam Tahhan <mtahhan@...hat.com>,
xdp-hints@...-project.net,
netdev@...r.kernel.org,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Alexei Starovoitov <alexei.starovoitov@...il.com>,
Tariq Toukan <tariqt@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH bpf-next v8 05/18] ice: Support HW timestamp hint
Use previously refactored code and create a function
that allows XDP code to read HW timestamp.
Also, introduce packet context, where hints-related data will be stored.
ice_xdp_buff contains only a pointer to this structure, to avoid copying it
in ZC mode later in the series.
HW timestamp is the first supported hint in the driver,
so also add xdp_metadata_ops.
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
---
drivers/net/ethernet/intel/ice/ice.h | 2 ++
drivers/net/ethernet/intel/ice/ice_base.c | 1 +
drivers/net/ethernet/intel/ice/ice_main.c | 1 +
drivers/net/ethernet/intel/ice/ice_ptp.c | 6 ++---
drivers/net/ethernet/intel/ice/ice_ptp.h | 4 +--
drivers/net/ethernet/intel/ice/ice_txrx.h | 10 +++++++-
drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 25 ++++++++++++++++++-
7 files changed, 42 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index cd7dcd0fa7f2..9cf4ed3d2885 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -996,4 +996,6 @@ static inline void ice_clear_rdma_cap(struct ice_pf *pf)
set_bit(ICE_FLAG_UNPLUG_AUX_DEV, pf->flags);
clear_bit(ICE_FLAG_RDMA_ENA, pf->flags);
}
+
+extern const struct xdp_metadata_ops ice_xdp_md_ops;
#endif /* _ICE_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
index 7fa43827a3f0..2d83f3c029e7 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -575,6 +575,7 @@ int ice_vsi_cfg_rxq(struct ice_rx_ring *ring)
xdp_init_buff(&ring->xdp, ice_rx_pg_size(ring) / 2, &ring->xdp_rxq);
ring->xdp.data = NULL;
+ ring->xdp_ext.pkt_ctx = &ring->pkt_ctx;
err = ice_setup_rx_ctx(ring);
if (err) {
dev_err(dev, "ice_setup_rx_ctx failed for RxQ %d, err %d\n",
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 43ba3e55b8c1..0a2415dd78f1 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3397,6 +3397,7 @@ static void ice_set_ops(struct ice_vsi *vsi)
netdev->netdev_ops = &ice_netdev_ops;
netdev->udp_tunnel_nic_info = &pf->hw.udp_tunnel_nic;
+ netdev->xdp_metadata_ops = &ice_xdp_md_ops;
ice_set_ethtool_ops(netdev);
if (vsi->type != ICE_VSI_PF)
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index bb54f43b5a18..a4d3a9ee409a 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -2129,12 +2129,12 @@ int ice_ptp_set_ts_config(struct ice_pf *pf, struct ifreq *ifr)
/**
* ice_ptp_get_rx_hwts - Get packet Rx timestamp in ns
* @rx_desc: Receive descriptor
- * @rx_ring: Ring to get the cached time
+ * @pkt_ctx: Packet context to get the cached time
*
* The driver receives a notification in the receive descriptor with timestamp.
*/
u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
- struct ice_rx_ring *rx_ring)
+ const struct ice_pkt_ctx *pkt_ctx)
{
u64 ts_ns, cached_time;
u32 ts_high;
@@ -2142,7 +2142,7 @@ u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
return 0;
- cached_time = READ_ONCE(rx_ring->cached_phctime);
+ cached_time = READ_ONCE(pkt_ctx->cached_phctime);
/* Do not report a timestamp if we don't have a cached PHC time */
if (!cached_time)
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 45327cb92bc6..5c6450e4f2f2 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -299,7 +299,7 @@ s8 ice_ptp_request_ts(struct ice_ptp_tx *tx, struct sk_buff *skb);
enum ice_tx_tstamp_work ice_ptp_process_ts(struct ice_pf *pf);
u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
- struct ice_rx_ring *rx_ring);
+ const struct ice_pkt_ctx *pkt_ctx);
void ice_ptp_reset(struct ice_pf *pf);
void ice_ptp_prepare_for_reset(struct ice_pf *pf);
void ice_ptp_init(struct ice_pf *pf);
@@ -331,7 +331,7 @@ static inline bool ice_ptp_process_ts(struct ice_pf *pf)
static inline u64
ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
- struct ice_rx_ring *rx_ring)
+ const struct ice_pkt_ctx *pkt_ctx)
{
return 0;
}
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index cd93394fab17..ce3434c73a4b 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -257,9 +257,14 @@ enum ice_rx_dtype {
ICE_RX_DTYPE_SPLIT_ALWAYS = 2,
};
+struct ice_pkt_ctx {
+ u64 cached_phctime;
+};
+
struct ice_xdp_buff {
struct xdp_buff xdp_buff;
const union ice_32b_rx_flex_desc *eop_desc;
+ const struct ice_pkt_ctx *pkt_ctx;
};
/* Required for compatibility with xdp_buffs from xsk_pool */
@@ -328,6 +333,10 @@ struct ice_rx_ring {
struct xdp_buff xdp;
};
/* CL3 - 3rd cacheline starts here */
+ union {
+ struct ice_pkt_ctx pkt_ctx;
+ u64 cached_phctime;
+ };
struct bpf_prog *xdp_prog;
u16 rx_offset;
@@ -346,7 +355,6 @@ struct ice_rx_ring {
struct ice_rx_ring *next; /* pointer to next ring in q_vector */
struct xsk_buff_pool *xsk_pool;
dma_addr_t dma; /* physical address of ring */
- u64 cached_phctime;
u16 rx_buf_len;
u8 dcb_tc; /* Traffic class of ring */
u8 ptp_rx;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 8904b22bfba7..13b8a9addfac 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -197,7 +197,7 @@ ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,
const union ice_32b_rx_flex_desc *rx_desc,
struct sk_buff *skb)
{
- u64 ts_ns = ice_ptp_get_rx_hwts(rx_desc, rx_ring);
+ u64 ts_ns = ice_ptp_get_rx_hwts(rx_desc, &rx_ring->pkt_ctx);
skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ts_ns);
}
@@ -507,3 +507,26 @@ void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res,
spin_unlock(&xdp_ring->tx_lock);
}
}
+
+/**
+ * ice_xdp_rx_hw_ts - HW timestamp XDP hint handler
+ * @ctx: XDP buff pointer
+ * @ts_ns: destination address
+ *
+ * Copy HW timestamp (if available) to the destination address.
+ */
+static int ice_xdp_rx_hw_ts(const struct xdp_md *ctx, u64 *ts_ns)
+{
+ const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+
+ *ts_ns = ice_ptp_get_rx_hwts(xdp_ext->eop_desc,
+ xdp_ext->pkt_ctx);
+ if (!*ts_ns)
+ return -ENODATA;
+
+ return 0;
+}
+
+const struct xdp_metadata_ops ice_xdp_md_ops = {
+ .xmo_rx_timestamp = ice_xdp_rx_hw_ts,
+};
--
2.41.0
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