[PATCH V2] compress/mlx5: support out-of-space status

[Raja Zidane <rzidane@nvidia.com>]

When trying to dequeue, an OP may fail due to insufficient space for the
OP output, the compressdev API defines out-of-space for OP status.
The driver can detect out-of-space errors and report them to the user.

Check if hw_error_syndrome specifies out-of-space and set the OP
status accordingly.
Also added an error message for a case of missing B-final flag.

Fixes: f8c97babc9f4 ("compress/mlx5: add data-path functions")
Cc: stable@dpdk.org

Signed-off-by: Raja Zidane <rzidane@nvidia.com>
---
Acked-by: Matan Azrad <matan@nvidia.com>
V2: fix implicit switch-case fallthrough
 drivers/common/mlx5/mlx5_prm.h        |  5 +++++
 drivers/compress/mlx5/mlx5_compress.c | 13 ++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/common/mlx5/mlx5_prm.h b/drivers/common/mlx5/mlx5_prm.h
index ce3e47059f..44b18225f6 100644
--- a/drivers/common/mlx5/mlx5_prm.h
+++ b/drivers/common/mlx5/mlx5_prm.h
@@ -262,6 +262,9 @@
 /* Maximum number of DS in WQE. Limited by 6-bit field. */
 #define MLX5_DSEG_MAX 63
 
+/* The 32 bit syndrome offset in struct mlx5_err_cqe. */
+#define MLX5_ERROR_CQE_SYNDROME_OFFSET 52
+
 /* The completion mode offset in the WQE control segment line 2. */
 #define MLX5_COMP_MODE_OFFSET 2
 
@@ -581,6 +584,8 @@ struct mlx5_rdma_write_wqe {
 #define MLX5_GGA_COMP_LOG_BLOCK_SIZE_MAX 15u
 #define MLX5_GGA_COMP_LOG_DYNAMIC_SIZE_MAX 15u
 #define MLX5_GGA_COMP_LOG_DYNAMIC_SIZE_MIN 0u
+#define MLX5_GGA_COMP_OUT_OF_SPACE_SYNDROME_BE 0x29D0084
+#define MLX5_GGA_COMP_MISSING_BFINAL_SYNDROME_BE 0x29D0011
 
 struct mlx5_wqe_metadata_seg {
 	uint32_t mmo_control_31_0; /* mmo_control_63_32 is in ctrl_seg.imm */
diff --git a/drivers/compress/mlx5/mlx5_compress.c b/drivers/compress/mlx5/mlx5_compress.c
index 7a482c3fbb..d64a628c74 100644
--- a/drivers/compress/mlx5/mlx5_compress.c
+++ b/drivers/compress/mlx5/mlx5_compress.c
@@ -562,7 +562,18 @@ mlx5_compress_cqe_err_handle(struct mlx5_compress_qp *qp,
 								    qp->qp.wqes;
 	volatile struct mlx5_gga_compress_opaque *opaq = qp->opaque_mr.addr;
 
-	op->status = RTE_COMP_OP_STATUS_ERROR;
+	volatile uint32_t *synd_word = RTE_PTR_ADD(cqe, MLX5_ERROR_CQE_SYNDROME_OFFSET);
+	switch (*synd_word) {
+	case MLX5_GGA_COMP_OUT_OF_SPACE_SYNDROME_BE:
+		op->status = RTE_COMP_OP_STATUS_OUT_OF_SPACE_TERMINATED;
+		DRV_LOG(DEBUG, "OUT OF SPACE error, output is bigger than dst buffer.");
+		break;
+	case MLX5_GGA_COMP_MISSING_BFINAL_SYNDROME_BE:
+		DRV_LOG(DEBUG, "The last compressed block missed the B-final flag; maybe the compressed data is not complete or garbaged?");
+		/* fallthrough */
+	default:
+		op->status = RTE_COMP_OP_STATUS_ERROR;
+	}
 	op->consumed = 0;
 	op->produced = 0;
 	op->output_chksum = 0;
-- 
2.21.0