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Message-Id: <20220702190213.80858-9-saeed@kernel.org>
Date: Sat, 2 Jul 2022 12:02:06 -0700
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
Jianbo Liu <jianbol@...dia.com>,
Ariel Levkovich <lariel@...dia.com>
Subject: [net-next v2 08/15] net/mlx5: Implement interfaces to control ASO SQ and CQ
From: Jianbo Liu <jianbol@...dia.com>
Add interfaces to use ASO object control channel. The channel consists
of a control SQ and CQ to which user can post ACCESS_ASO work requests
to modify ASO objects. The functions to get wqe from SQ, fill wqe,
post the request, and poll the completion of the work, are provided.
Signed-off-by: Jianbo Liu <jianbol@...dia.com>
Reviewed-by: Ariel Levkovich <lariel@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
.../net/ethernet/mellanox/mlx5/core/lib/aso.c | 97 +++++++++++++++++++
.../net/ethernet/mellanox/mlx5/core/lib/aso.h | 65 +++++++++++++
2 files changed, 162 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.c
index 4195d54d0f51..21e14507ff5c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.c
@@ -334,3 +334,100 @@ void mlx5_aso_destroy(struct mlx5_aso *aso)
mlx5_aso_destroy_cq(&aso->cq);
kfree(aso);
}
+
+void mlx5_aso_build_wqe(struct mlx5_aso *aso, u8 ds_cnt,
+ struct mlx5_aso_wqe *aso_wqe,
+ u32 obj_id, u32 opc_mode)
+{
+ struct mlx5_wqe_ctrl_seg *cseg = &aso_wqe->ctrl;
+
+ cseg->opmod_idx_opcode = cpu_to_be32((opc_mode << MLX5_WQE_CTRL_WQE_OPC_MOD_SHIFT) |
+ (aso->pc << MLX5_WQE_CTRL_WQE_INDEX_SHIFT) |
+ MLX5_OPCODE_ACCESS_ASO);
+ cseg->qpn_ds = cpu_to_be32((aso->sqn << MLX5_WQE_CTRL_QPN_SHIFT) | ds_cnt);
+ cseg->fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
+ cseg->general_id = cpu_to_be32(obj_id);
+}
+
+void *mlx5_aso_get_wqe(struct mlx5_aso *aso)
+{
+ u16 pi;
+
+ pi = mlx5_wq_cyc_ctr2ix(&aso->wq, aso->pc);
+ return mlx5_wq_cyc_get_wqe(&aso->wq, pi);
+}
+
+void mlx5_aso_post_wqe(struct mlx5_aso *aso, bool with_data,
+ struct mlx5_wqe_ctrl_seg *doorbell_cseg)
+{
+ doorbell_cseg->fm_ce_se |= MLX5_WQE_CTRL_CQ_UPDATE;
+ /* ensure wqe is visible to device before updating doorbell record */
+ dma_wmb();
+
+ if (with_data)
+ aso->pc += MLX5_ASO_WQEBBS_DATA;
+ else
+ aso->pc += MLX5_ASO_WQEBBS;
+ *aso->wq.db = cpu_to_be32(aso->pc);
+
+ /* ensure doorbell record is visible to device before ringing the
+ * doorbell
+ */
+ wmb();
+
+ mlx5_write64((__be32 *)doorbell_cseg, aso->uar_map);
+
+ /* Ensure doorbell is written on uar_page before poll_cq */
+ WRITE_ONCE(doorbell_cseg, NULL);
+}
+
+int mlx5_aso_poll_cq(struct mlx5_aso *aso, bool with_data, u32 interval_ms)
+{
+ struct mlx5_aso_cq *cq = &aso->cq;
+ struct mlx5_cqe64 *cqe;
+ unsigned long expires;
+
+ cqe = mlx5_cqwq_get_cqe(&cq->wq);
+
+ expires = jiffies + msecs_to_jiffies(interval_ms);
+ while (!cqe && time_is_after_jiffies(expires)) {
+ usleep_range(2, 10);
+ cqe = mlx5_cqwq_get_cqe(&cq->wq);
+ }
+
+ if (!cqe)
+ return -ETIMEDOUT;
+
+ /* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
+ * otherwise a cq overrun may occur
+ */
+ mlx5_cqwq_pop(&cq->wq);
+
+ if (unlikely(get_cqe_opcode(cqe) != MLX5_CQE_REQ)) {
+ struct mlx5_err_cqe *err_cqe;
+
+ mlx5_core_err(cq->mdev, "Bad OP in ASOSQ CQE: 0x%x\n",
+ get_cqe_opcode(cqe));
+
+ err_cqe = (struct mlx5_err_cqe *)cqe;
+ mlx5_core_err(cq->mdev, "vendor_err_synd=%x\n",
+ err_cqe->vendor_err_synd);
+ mlx5_core_err(cq->mdev, "syndrome=%x\n",
+ err_cqe->syndrome);
+ print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET,
+ 16, 1, err_cqe,
+ sizeof(*err_cqe), false);
+ }
+
+ mlx5_cqwq_update_db_record(&cq->wq);
+
+ /* ensure cq space is freed before enabling more cqes */
+ wmb();
+
+ if (with_data)
+ aso->cc += MLX5_ASO_WQEBBS_DATA;
+ else
+ aso->cc += MLX5_ASO_WQEBBS;
+
+ return 0;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.h
index 55496513d1f9..7420df061b3b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/aso.h
@@ -4,10 +4,75 @@
#ifndef __MLX5_LIB_ASO_H__
#define __MLX5_LIB_ASO_H__
+#include <linux/mlx5/qp.h>
#include "mlx5_core.h"
+#define MLX5_ASO_WQEBBS \
+ (DIV_ROUND_UP(sizeof(struct mlx5_aso_wqe), MLX5_SEND_WQE_BB))
+#define MLX5_ASO_WQEBBS_DATA \
+ (DIV_ROUND_UP(sizeof(struct mlx5_aso_wqe_data), MLX5_SEND_WQE_BB))
+#define MLX5_WQE_CTRL_WQE_OPC_MOD_SHIFT 24
+
+struct mlx5_wqe_aso_ctrl_seg {
+ __be32 va_h;
+ __be32 va_l; /* include read_enable */
+ __be32 l_key;
+ u8 data_mask_mode;
+ u8 condition_1_0_operand;
+ u8 condition_1_0_offset;
+ u8 data_offset_condition_operand;
+ __be32 condition_0_data;
+ __be32 condition_0_mask;
+ __be32 condition_1_data;
+ __be32 condition_1_mask;
+ __be64 bitwise_data;
+ __be64 data_mask;
+};
+
+struct mlx5_wqe_aso_data_seg {
+ __be32 bytewise_data[16];
+};
+
+struct mlx5_aso_wqe {
+ struct mlx5_wqe_ctrl_seg ctrl;
+ struct mlx5_wqe_aso_ctrl_seg aso_ctrl;
+};
+
+struct mlx5_aso_wqe_data {
+ struct mlx5_wqe_ctrl_seg ctrl;
+ struct mlx5_wqe_aso_ctrl_seg aso_ctrl;
+ struct mlx5_wqe_aso_data_seg aso_data;
+};
+
+enum {
+ MLX5_ASO_ALWAYS_FALSE,
+ MLX5_ASO_ALWAYS_TRUE,
+ MLX5_ASO_EQUAL,
+ MLX5_ASO_NOT_EQUAL,
+ MLX5_ASO_GREATER_OR_EQUAL,
+ MLX5_ASO_LESSER_OR_EQUAL,
+ MLX5_ASO_LESSER,
+ MLX5_ASO_GREATER,
+ MLX5_ASO_CYCLIC_GREATER,
+ MLX5_ASO_CYCLIC_LESSER,
+};
+
+enum {
+ MLX5_ASO_DATA_MASK_MODE_BITWISE_64BIT,
+ MLX5_ASO_DATA_MASK_MODE_BYTEWISE_64BYTE,
+ MLX5_ASO_DATA_MASK_MODE_CALCULATED_64BYTE,
+};
+
struct mlx5_aso;
+void *mlx5_aso_get_wqe(struct mlx5_aso *aso);
+void mlx5_aso_build_wqe(struct mlx5_aso *aso, u8 ds_cnt,
+ struct mlx5_aso_wqe *aso_wqe,
+ u32 obj_id, u32 opc_mode);
+void mlx5_aso_post_wqe(struct mlx5_aso *aso, bool with_data,
+ struct mlx5_wqe_ctrl_seg *doorbell_cseg);
+int mlx5_aso_poll_cq(struct mlx5_aso *aso, bool with_data, u32 interval_ms);
+
struct mlx5_aso *mlx5_aso_create(struct mlx5_core_dev *mdev, u32 pdn);
void mlx5_aso_destroy(struct mlx5_aso *aso);
#endif /* __MLX5_LIB_ASO_H__ */
--
2.36.1
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