[29/36] common/sfc_efx/base: provide helper to check Rx prefix
Checks
Commit Message
A new function allows to check if used Rx prefix layout matches
available Rx prefix layout. Length check is out-of-scope of the
function and caller should ensure length is either checked or
different length with everything required in place is handled
properly.
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
drivers/common/sfc_efx/base/efx.h | 12 ++++++
drivers/common/sfc_efx/base/efx_rx.c | 40 +++++++++++++++++++
.../sfc_efx/rte_common_sfc_efx_version.map | 1 +
3 files changed, 53 insertions(+)
@@ -2920,6 +2920,18 @@ typedef struct efx_rx_prefix_layout_s {
efx_rx_prefix_field_info_t erpl_fields[EFX_RX_PREFIX_NFIELDS];
} efx_rx_prefix_layout_t;
+/*
+ * Helper function to find out a bit mask of wanted but not available
+ * Rx prefix fields.
+ *
+ * A field is considered as not available if any parameter mismatch.
+ */
+LIBEFX_API
+extern __checkReturn uint32_t
+efx_rx_prefix_layout_check(
+ __in const efx_rx_prefix_layout_t *available,
+ __in const efx_rx_prefix_layout_t *wanted);
+
LIBEFX_API
extern __checkReturn efx_rc_t
efx_rx_prefix_get_layout(
@@ -1803,3 +1803,43 @@ siena_rx_fini(
}
#endif /* EFSYS_OPT_SIENA */
+
+static __checkReturn boolean_t
+efx_rx_prefix_layout_fields_match(
+ __in const efx_rx_prefix_field_info_t *erpfip1,
+ __in const efx_rx_prefix_field_info_t *erpfip2)
+{
+ if (erpfip1->erpfi_offset_bits != erpfip2->erpfi_offset_bits)
+ return (B_FALSE);
+
+ if (erpfip1->erpfi_width_bits != erpfip2->erpfi_width_bits)
+ return (B_FALSE);
+
+ if (erpfip1->erpfi_big_endian != erpfip2->erpfi_big_endian)
+ return (B_FALSE);
+
+ return (B_TRUE);
+}
+
+ __checkReturn uint32_t
+efx_rx_prefix_layout_check(
+ __in const efx_rx_prefix_layout_t *available,
+ __in const efx_rx_prefix_layout_t *wanted)
+{
+ uint32_t result = 0;
+ unsigned int i;
+
+ EFX_STATIC_ASSERT(EFX_RX_PREFIX_NFIELDS < sizeof (result) * 8);
+ for (i = 0; i < EFX_RX_PREFIX_NFIELDS; ++i) {
+ /* Skip the field if driver does not want to use it */
+ if (wanted->erpl_fields[i].erpfi_width_bits == 0)
+ continue;
+
+ if (efx_rx_prefix_layout_fields_match(
+ &available->erpl_fields[i],
+ &wanted->erpl_fields[i]) == B_FALSE)
+ result |= (1U << i);
+ }
+
+ return (result);
+}
@@ -141,6 +141,7 @@ INTERNAL {
efx_rx_hash_default_support_get;
efx_rx_init;
efx_rx_prefix_get_layout;
+ efx_rx_prefix_layout_check;
efx_rx_qcreate;
efx_rx_qcreate_es_super_buffer;
efx_rx_qdestroy;