[PATCH net 2/6] xsk: pass TX metadata pointer by reference
From: Stanislav Fomichev
Date: Mon Jul 27 2026 - 12:29:00 EST
Completion handling needs to know whether a timestamp was requested when
the metadata was processed. Let xsk_tx_metadata_request() update the
caller's metadata pointer so that decision can be carried forward without
rereading user-controlled flags.
This only changes the interface; behavior remains unchanged.
Fixes: ca4419f15abd ("xsk: Add launch time hardware offload support to XDP Tx metadata")
Cc: Cen Zhang (Microsoft) <blbllhy@xxxxxxxxx>
Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxxx>
---
drivers/net/ethernet/intel/igc/igc_main.c | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en.h | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 14 +++++++++-----
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h | 4 ++--
.../net/ethernet/mellanox/mlx5/core/en/xsk/tx.c | 2 +-
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
include/net/libeth/xsk.h | 2 +-
include/net/xdp_sock.h | 8 +++++---
8 files changed, 21 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 2c9e2dfd8499..5a18d00deb4f 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -3082,7 +3082,7 @@ static void igc_xdp_xmit_zc(struct igc_ring *ring)
meta_req.tx_buffer = bi;
meta_req.meta = meta;
meta_req.used_desc = 0;
- xsk_tx_metadata_request(meta, &igc_xsk_tx_metadata_ops,
+ xsk_tx_metadata_request(&meta, &igc_xsk_tx_metadata_ops,
&meta_req);
/* xsk_tx_metadata_request() may have updated next_to_use */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index d507289096c2..e12cb41c4b97 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -483,7 +483,7 @@ typedef int (*mlx5e_fp_xmit_xdp_frame_check)(struct mlx5e_xdpsq *);
typedef bool (*mlx5e_fp_xmit_xdp_frame)(struct mlx5e_xdpsq *,
struct mlx5e_xmit_data *,
int,
- struct xsk_tx_metadata *);
+ struct xsk_tx_metadata **);
struct mlx5e_xdpsq {
/* data path */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
index d8c7cb8837d7..dac5e9d4c8bd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -452,11 +452,11 @@ INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq
INDIRECT_CALLABLE_SCOPE bool
mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
- int check_result, struct xsk_tx_metadata *meta);
+ int check_result, struct xsk_tx_metadata **meta);
INDIRECT_CALLABLE_SCOPE bool
mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
- int check_result, struct xsk_tx_metadata *meta)
+ int check_result, struct xsk_tx_metadata **meta)
{
struct mlx5e_tx_mpwqe *session = &sq->mpwqe;
struct mlx5e_xdpsq_stats *stats = sq->stats;
@@ -504,7 +504,10 @@ mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptx
* and it's safe to complete it at any time.
*/
mlx5e_xdp_mpwqe_session_start(sq);
- xsk_tx_metadata_request(meta, &mlx5e_xsk_tx_metadata_ops, &session->wqe->eth);
+ if (meta)
+ xsk_tx_metadata_request(meta,
+ &mlx5e_xsk_tx_metadata_ops,
+ &session->wqe->eth);
}
mlx5e_xdp_mpwqe_add_dseg(sq, p, stats);
@@ -535,7 +538,7 @@ INDIRECT_CALLABLE_SCOPE int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq)
INDIRECT_CALLABLE_SCOPE bool
mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
- int check_result, struct xsk_tx_metadata *meta)
+ int check_result, struct xsk_tx_metadata **meta)
{
struct mlx5e_xmit_data_frags *xdptxdf =
container_of(xdptxd, struct mlx5e_xmit_data_frags, xd);
@@ -649,7 +652,8 @@ mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
sq->pc += num_wqebbs;
- xsk_tx_metadata_request(meta, &mlx5e_xsk_tx_metadata_ops, eseg);
+ if (meta)
+ xsk_tx_metadata_request(meta, &mlx5e_xsk_tx_metadata_ops, eseg);
sq->doorbell_cseg = cseg;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
index 3c54f8962664..5b8f4094d553 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
@@ -114,11 +114,11 @@ extern const struct xsk_tx_metadata_ops mlx5e_xsk_tx_metadata_ops;
INDIRECT_CALLABLE_DECLARE(bool mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq,
struct mlx5e_xmit_data *xdptxd,
int check_result,
- struct xsk_tx_metadata *meta));
+ struct xsk_tx_metadata **meta));
INDIRECT_CALLABLE_DECLARE(bool mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq,
struct mlx5e_xmit_data *xdptxd,
int check_result,
- struct xsk_tx_metadata *meta));
+ struct xsk_tx_metadata **meta));
INDIRECT_CALLABLE_DECLARE(int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq));
INDIRECT_CALLABLE_DECLARE(int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq));
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c
index 8aeab4b21035..3d19dad8f868 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c
@@ -105,7 +105,7 @@ bool mlx5e_xsk_tx(struct mlx5e_xdpsq *sq, unsigned int budget)
ret = INDIRECT_CALL_2(sq->xmit_xdp_frame, mlx5e_xmit_xdp_frame_mpwqe,
mlx5e_xmit_xdp_frame, sq, &xdptxd,
- check_result, meta);
+ check_result, &meta);
if (unlikely(!ret)) {
if (sq->mpwqe.wqe)
mlx5e_xdp_mpwqe_complete(sq);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 151c77713025..3f5111969c41 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2747,7 +2747,7 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
meta_req.set_ic = &set_ic;
meta_req.tbs = tx_q->tbs;
meta_req.edesc = &tx_q->dma_entx[entry];
- xsk_tx_metadata_request(meta, &stmmac_xsk_tx_metadata_ops,
+ xsk_tx_metadata_request(&meta, &stmmac_xsk_tx_metadata_ops,
&meta_req);
if (set_ic) {
tx_q->tx_count_frames = 0;
diff --git a/include/net/libeth/xsk.h b/include/net/libeth/xsk.h
index 82b5d21aae87..e2fa6bf6b1b3 100644
--- a/include/net/libeth/xsk.h
+++ b/include/net/libeth/xsk.h
@@ -205,7 +205,7 @@ __libeth_xsk_xmit_fill_buf_md(const struct xdp_desc *xdesc,
BUILD_BUG_ON(!__builtin_constant_p(tmo == libeth_xsktmo));
tmo = tmo == libeth_xsktmo ? &__libeth_xsktmo : tmo;
- xsk_tx_metadata_request(ctx.meta, tmo, &desc);
+ xsk_tx_metadata_request(&ctx.meta, tmo, &desc);
return desc;
}
diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
index 8b51876efbed..06c081feff42 100644
--- a/include/net/xdp_sock.h
+++ b/include/net/xdp_sock.h
@@ -153,17 +153,19 @@ static inline void xsk_tx_metadata_to_compl(struct xsk_tx_metadata *meta,
/**
* 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
+ * @pmeta: pointer to 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,
+static inline void xsk_tx_metadata_request(struct xsk_tx_metadata **pmeta,
const struct xsk_tx_metadata_ops *ops,
void *priv)
{
+ const struct xsk_tx_metadata *meta = *pmeta;
+
if (!meta)
return;
@@ -231,7 +233,7 @@ static inline void xsk_tx_metadata_to_compl(struct xsk_tx_metadata *meta,
{
}
-static inline void xsk_tx_metadata_request(struct xsk_tx_metadata *meta,
+static inline void xsk_tx_metadata_request(struct xsk_tx_metadata **pmeta,
const struct xsk_tx_metadata_ops *ops,
void *priv)
{
--
2.53.0-Meta