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dmadev: add flag for error handling support

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Due to HW or driver limitations, not all dmadevs may support full error
handling e.g. safely managing and reporting an invalid address to a copy
operation. The skeleton dmadev, for example, being pure software will
always seg-fault if passed an invalid address. To indicate the
availability of safe error handling by a device, we add a capability
flag for it.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: Conor Walsh <conor.walsh@intel.com>
Reviewed-by: Kevin Laatz <kevin.laatz@intel.com>
This commit is contained in:
Bruce Richardson 2021-10-13 16:17:33 +01:00 committed by Thomas Monjalon
parent 1b86a66a30
commit 2e348d8fe3
2 changed files with 9 additions and 0 deletions
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1
lib/dmadev/rte_dmadev.c
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@ -722,6 +722,7 @@ dma_capability_name(uint64_t capability)
{ RTE_DMA_CAPA_DEV_TO_DEV, "dev2dev" },
{ RTE_DMA_CAPA_SVA, "sva" },
{ RTE_DMA_CAPA_SILENT, "silent" },
{ RTE_DMA_CAPA_HANDLES_ERRORS, "handles_errors" },
{ RTE_DMA_CAPA_OPS_COPY, "copy" },
{ RTE_DMA_CAPA_OPS_COPY_SG, "copy_sg" },
{ RTE_DMA_CAPA_OPS_FILL, "fill" },

8
lib/dmadev/rte_dmadev.h
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@ -262,6 +262,14 @@ int16_t rte_dma_next_dev(int16_t start_dev_id);
* @see struct rte_dma_conf::silent_mode
*/
#define RTE_DMA_CAPA_SILENT RTE_BIT64(5)
/** Supports error handling
*
* With this bit set, invalid input addresses will be reported as operation failures
* to the user but other operations can continue.
* Without this bit set, invalid data is not handled by either HW or driver, so user
* must ensure that all memory addresses are valid and accessible by HW.
*/
#define RTE_DMA_CAPA_HANDLES_ERRORS RTE_BIT64(6)
/** Support copy operation.
* This capability start with index of 32, so that it could leave gap between
* normal capability and ops capability.