[PATCH] compressdev: fix end of comp PMD list macro conflict

[Michael Baum <michaelba@nvidia.com>]

The "rte_compressdev_info_get()" function retrieves the contextual
information of a device.
The output structure "dev_info" contains a list of devices supported
capabilities for each supported algorithm.

In this function description, it says the element after the last valid
element has op field set to "RTE_COMP_ALGO_LIST_END".
On the other hand, when this function used by
"rte_compressdev_capability_get()" function, it uses
"RTE_COMP_ALGO_UNSPECIFIED" as end of list as same as the
"RTE_COMP_END_OF_CAPABILITIES_LIST()".

The mlx5 and qat PMDs use "RTE_COMP_ALGO_LIST_END" as the end of
capabilities list. When "rte_compressdev_capability_get()" function is
called with unsupported algorithm, it might read memory out of bound.

This patch change the "rte_compressdev_info_get()" function description
to say using "RTE_COMP_ALGO_UNSPECIFIED" as the end of capabilities
list.
In addition, it moves both mlx5 and qat PMDs to use
"RTE_COMP_ALGO_UNSPECIFIED" through
"RTE_COMP_END_OF_CAPABILITIES_LIST()" macro.

Fixes: 5d432f364078 ("compressdev: add device capabilities")
Fixes: 2d148597ce76 ("compress/qat: add gen-specific implementation")
Fixes: 384bac8d6555 ("compress/mlx5: add supported capabilities")
Cc: fiona.trahe@intel.com
Cc: roy.fan.zhang@intel.com
Cc: matan@nvidia.com
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <michaelba@nvidia.com>

---

After this change, I'm not sure about the purpose of
"RTE_COMP_ALGO_LIST_END".
There is no any other use of it in DPDK code, and it isn't represent the
number of algorithms supported by the API since the
"RTE_COMP_ALGO_UNSPECIFIED" is part of the enum.

Due to the compress API is experimental I think the
"RTE_COMP_ALGO_LIST_END" can be removed.



 drivers/compress/mlx5/mlx5_compress.c        | 4 +---
 drivers/compress/qat/dev/qat_comp_pmd_gen1.c | 2 +-
 drivers/compress/qat/dev/qat_comp_pmd_gen4.c | 2 +-
 lib/compressdev/rte_compressdev.h            | 2 +-
 4 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/compress/mlx5/mlx5_compress.c b/drivers/compress/mlx5/mlx5_compress.c
index fb2bda9745..459e4b5e8a 100644
--- a/drivers/compress/mlx5/mlx5_compress.c
+++ b/drivers/compress/mlx5/mlx5_compress.c
@@ -96,9 +96,7 @@ static const struct rte_compressdev_capabilities mlx5_caps[] = {
 				      RTE_COMP_FF_HUFFMAN_DYNAMIC,
 		.window_size = {.min = 10, .max = 15, .increment = 1},
 	},
-	{
-		.algo = RTE_COMP_ALGO_LIST_END,
-	}
+	RTE_COMP_END_OF_CAPABILITIES_LIST()
 };
 
 static void
diff --git a/drivers/compress/qat/dev/qat_comp_pmd_gen1.c b/drivers/compress/qat/dev/qat_comp_pmd_gen1.c
index 12d9d89072..3a8484eef1 100644
--- a/drivers/compress/qat/dev/qat_comp_pmd_gen1.c
+++ b/drivers/compress/qat/dev/qat_comp_pmd_gen1.c
@@ -26,7 +26,7 @@ const struct rte_compressdev_capabilities qat_gen1_comp_capabilities[] = {
 				RTE_COMP_FF_OOP_LB_IN_SGL_OUT |
 				RTE_COMP_FF_STATEFUL_DECOMPRESSION,
 	 .window_size = {.min = 15, .max = 15, .increment = 0} },
-	{RTE_COMP_ALGO_LIST_END, 0, {0, 0, 0} } };
+	 RTE_COMP_END_OF_CAPABILITIES_LIST() };
 
 static int
 qat_comp_dev_config_gen1(struct rte_compressdev *dev,
diff --git a/drivers/compress/qat/dev/qat_comp_pmd_gen4.c b/drivers/compress/qat/dev/qat_comp_pmd_gen4.c
index 79b2ceb414..05906f13e0 100644
--- a/drivers/compress/qat/dev/qat_comp_pmd_gen4.c
+++ b/drivers/compress/qat/dev/qat_comp_pmd_gen4.c
@@ -25,7 +25,7 @@ qat_gen4_comp_capabilities[] = {
 				RTE_COMP_FF_OOP_SGL_IN_LB_OUT |
 				RTE_COMP_FF_OOP_LB_IN_SGL_OUT,
 	 .window_size = {.min = 15, .max = 15, .increment = 0} },
-	{RTE_COMP_ALGO_LIST_END, 0, {0, 0, 0} } };
+	 RTE_COMP_END_OF_CAPABILITIES_LIST() };
 
 static int
 qat_comp_dev_config_gen4(struct rte_compressdev *dev,
diff --git a/lib/compressdev/rte_compressdev.h b/lib/compressdev/rte_compressdev.h
index 42bda9fc79..7eb5c58798 100644
--- a/lib/compressdev/rte_compressdev.h
+++ b/lib/compressdev/rte_compressdev.h
@@ -353,7 +353,7 @@ rte_compressdev_stats_reset(uint8_t dev_id);
  * @note The capabilities field of dev_info is set to point to the first
  * element of an array of struct rte_compressdev_capabilities.
  * The element after the last valid element has it's op field set to
- * RTE_COMP_ALGO_LIST_END.
+ * RTE_COMP_ALGO_UNSPECIFIED.
  */
 __rte_experimental
 void
-- 
2.25.1