1a076689cd
It has been observed that in zero-loss benchmarks, when a slow traffic rate is being tested, the IRQ timer coalescing parameter was set too high, and the ethernet controller would start dropping packets because the job ring back half wouldn't be executed in time before the ethernet controller would fill its buffers, thereby significantly reducing the zero-loss performance figures. Empirical testing has shown that the best zero-loss performance is achieved when IRQ coalescing is set to minimum values and/or turned off, since apparently the job ring driver already implements an adequately-performing general-purpose IRQ mitigation strategy in software. Whilst we could go with minimal count (2-8) and timing settings (192-256), we prefer just turning h/w coalescing altogether off to minimize setkey latency (due to split key generation), and for consistent cross-SoC performance (the SEC vs. core clock ratio changes). Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
100 lines
2.9 KiB
Text
100 lines
2.9 KiB
Text
config CRYPTO_DEV_FSL_CAAM
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tristate "Freescale CAAM-Multicore driver backend"
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depends on FSL_SOC
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help
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Enables the driver module for Freescale's Cryptographic Accelerator
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and Assurance Module (CAAM), also known as the SEC version 4 (SEC4).
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This module adds a job ring operation interface, and configures h/w
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to operate as a DPAA component automatically, depending
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on h/w feature availability.
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To compile this driver as a module, choose M here: the module
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will be called caam.
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config CRYPTO_DEV_FSL_CAAM_RINGSIZE
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int "Job Ring size"
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depends on CRYPTO_DEV_FSL_CAAM
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range 2 9
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default "9"
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help
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Select size of Job Rings as a power of 2, within the
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range 2-9 (ring size 4-512).
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Examples:
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2 => 4
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3 => 8
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4 => 16
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5 => 32
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6 => 64
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7 => 128
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8 => 256
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9 => 512
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config CRYPTO_DEV_FSL_CAAM_INTC
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bool "Job Ring interrupt coalescing"
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depends on CRYPTO_DEV_FSL_CAAM
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default n
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help
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Enable the Job Ring's interrupt coalescing feature.
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Note: the driver already provides adequate
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interrupt coalescing in software.
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config CRYPTO_DEV_FSL_CAAM_INTC_COUNT_THLD
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int "Job Ring interrupt coalescing count threshold"
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depends on CRYPTO_DEV_FSL_CAAM_INTC
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range 1 255
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default 255
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help
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Select number of descriptor completions to queue before
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raising an interrupt, in the range 1-255. Note that a selection
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of 1 functionally defeats the coalescing feature, and a selection
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equal or greater than the job ring size will force timeouts.
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config CRYPTO_DEV_FSL_CAAM_INTC_TIME_THLD
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int "Job Ring interrupt coalescing timer threshold"
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depends on CRYPTO_DEV_FSL_CAAM_INTC
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range 1 65535
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default 2048
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help
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Select number of bus clocks/64 to timeout in the case that one or
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more descriptor completions are queued without reaching the count
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threshold. Range is 1-65535.
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config CRYPTO_DEV_FSL_CAAM_CRYPTO_API
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tristate "Register algorithm implementations with the Crypto API"
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depends on CRYPTO_DEV_FSL_CAAM
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default y
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select CRYPTO_ALGAPI
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select CRYPTO_AUTHENC
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help
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Selecting this will offload crypto for users of the
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scatterlist crypto API (such as the linux native IPSec
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stack) to the SEC4 via job ring.
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To compile this as a module, choose M here: the module
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will be called caamalg.
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config CRYPTO_DEV_FSL_CAAM_AHASH_API
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tristate "Register hash algorithm implementations with Crypto API"
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depends on CRYPTO_DEV_FSL_CAAM
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default y
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select CRYPTO_AHASH
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help
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Selecting this will offload ahash for users of the
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scatterlist crypto API to the SEC4 via job ring.
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To compile this as a module, choose M here: the module
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will be called caamhash.
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config CRYPTO_DEV_FSL_CAAM_RNG_API
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tristate "Register caam device for hwrng API"
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depends on CRYPTO_DEV_FSL_CAAM
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default y
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select CRYPTO_RNG
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select HW_RANDOM
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help
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Selecting this will register the SEC4 hardware rng to
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the hw_random API for suppying the kernel entropy pool.
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To compile this as a module, choose M here: the module
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will be called caamrng.
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