From: Adrien Mazarguil Date: Fri, 31 Aug 2018 09:01:02 +0000 (+0200) Subject: ethdev: add flow API item/action name conversion X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=239dfc8d660d776e7737c324b31888ccfeff55b0;p=dpdk.git ethdev: add flow API item/action name conversion This provides a means for applications to retrieve the name of flow pattern items and actions. Signed-off-by: Adrien Mazarguil Acked-by: Nelio Laranjeiro --- diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst index 964cf9ceb1..1b17f6e011 100644 --- a/doc/guides/prog_guide/rte_flow.rst +++ b/doc/guides/prog_guide/rte_flow.rst @@ -2437,6 +2437,7 @@ operations include: - Attributes, pattern item or action duplication. - Duplication of an entire pattern or list of actions. - Duplication of a complete flow rule description. +- Pattern item or action name retrieval. Caveats ------- diff --git a/lib/librte_ethdev/rte_flow.c b/lib/librte_ethdev/rte_flow.c index 4fd6cfa768..c3ff7e7134 100644 --- a/lib/librte_ethdev/rte_flow.c +++ b/lib/librte_ethdev/rte_flow.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "rte_ethdev.h" #include "rte_flow_driver.h" #include "rte_flow.h" @@ -679,6 +680,60 @@ rte_flow_conv_rule(struct rte_flow_conv_rule *dst, return off; } +/** + * Retrieve the name of a pattern item/action type. + * + * @param is_action + * Nonzero when @p src represents an action type instead of a pattern item + * type. + * @param is_ptr + * Nonzero to write string address instead of contents into @p dst. + * @param[out] dst + * Destination buffer. Can be NULL if @p size is zero. + * @param size + * Size of @p dst in bytes. + * @param[in] src + * Depending on @p is_action, source pattern item or action type cast as a + * pointer. + * @param[out] error + * Perform verbose error reporting if not NULL. + * + * @return + * A positive value representing the number of bytes needed to store the + * name or its address regardless of @p size on success (@p buf contents + * are truncated to @p size if not large enough), a negative errno value + * otherwise and rte_errno is set. + */ +static int +rte_flow_conv_name(int is_action, + int is_ptr, + char *dst, + const size_t size, + const void *src, + struct rte_flow_error *error) +{ + struct desc_info { + const struct rte_flow_desc_data *data; + size_t num; + }; + static const struct desc_info info_rep[2] = { + { rte_flow_desc_item, RTE_DIM(rte_flow_desc_item), }, + { rte_flow_desc_action, RTE_DIM(rte_flow_desc_action), }, + }; + const struct desc_info *const info = &info_rep[!!is_action]; + unsigned int type = (uintptr_t)src; + + if (type >= info->num) + return rte_flow_error_set + (error, EINVAL, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, + "unknown object type to retrieve the name of"); + if (!is_ptr) + return strlcpy(dst, info->data[type].name, size); + if (size >= sizeof(const char **)) + *((const char **)dst) = info->data[type].name; + return sizeof(const char **); +} + /** Helper function to convert flow API objects. */ int rte_flow_conv(enum rte_flow_conv_op op, @@ -708,6 +763,14 @@ rte_flow_conv(enum rte_flow_conv_op op, return rte_flow_conv_actions(dst, size, src, 0, error); case RTE_FLOW_CONV_OP_RULE: return rte_flow_conv_rule(dst, size, src, error); + case RTE_FLOW_CONV_OP_ITEM_NAME: + return rte_flow_conv_name(0, 0, dst, size, src, error); + case RTE_FLOW_CONV_OP_ACTION_NAME: + return rte_flow_conv_name(1, 0, dst, size, src, error); + case RTE_FLOW_CONV_OP_ITEM_NAME_PTR: + return rte_flow_conv_name(0, 1, dst, size, src, error); + case RTE_FLOW_CONV_OP_ACTION_NAME_PTR: + return rte_flow_conv_name(1, 1, dst, size, src, error); } return rte_flow_error_set (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h index 1288e76ae3..052ceefb61 100644 --- a/lib/librte_ethdev/rte_flow.h +++ b/lib/librte_ethdev/rte_flow.h @@ -2043,6 +2043,62 @@ enum rte_flow_conv_op { * @code struct rte_flow_conv_rule * @endcode */ RTE_FLOW_CONV_OP_RULE, + + /** + * Convert item type to its name string. + * + * Writes a NUL-terminated string to @p dst. Like snprintf(), the + * returned value excludes the terminator which is always written + * nonetheless. + * + * - @p src type: + * @code (const void *)enum rte_flow_item_type @endcode + * - @p dst type: + * @code char * @endcode + **/ + RTE_FLOW_CONV_OP_ITEM_NAME, + + /** + * Convert action type to its name string. + * + * Writes a NUL-terminated string to @p dst. Like snprintf(), the + * returned value excludes the terminator which is always written + * nonetheless. + * + * - @p src type: + * @code (const void *)enum rte_flow_action_type @endcode + * - @p dst type: + * @code char * @endcode + **/ + RTE_FLOW_CONV_OP_ACTION_NAME, + + /** + * Convert item type to pointer to item name. + * + * Retrieves item name pointer from its type. The string itself is + * not copied; instead, a unique pointer to an internal static + * constant storage is written to @p dst. + * + * - @p src type: + * @code (const void *)enum rte_flow_item_type @endcode + * - @p dst type: + * @code const char ** @endcode + */ + RTE_FLOW_CONV_OP_ITEM_NAME_PTR, + + /** + * Convert action type to pointer to action name. + * + * Retrieves action name pointer from its type. The string itself is + * not copied; instead, a unique pointer to an internal static + * constant storage is written to @p dst. + * + * - @p src type: + * @code (const void *)enum rte_flow_action_type @endcode + * - @p dst type: + * @code const char ** @endcode + */ + RTE_FLOW_CONV_OP_ACTION_NAME_PTR, }; /**