[dpdk-dev] [PATCH v2 02/18] raw/ioat: split header for readability
Laatz, Kevin
kevin.laatz at intel.com
Tue Aug 25 17:27:35 CEST 2020
On 21/08/2020 17:29, Bruce Richardson wrote:
> Rather than having a single long complicated header file for general use we
> can split things so that there is one header with all the publically needed
> information - data structs and function prototypes - while the rest of the
> internal details are put separately. This makes it easier to read,
> understand and use the APIs.
>
> Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
>
> There are a couple of checkpatch errors about spacing in this patch,
> however, it appears that these are false positives.
> ---
> drivers/raw/ioat/meson.build | 1 +
> drivers/raw/ioat/rte_ioat_rawdev.h | 144 +---------------------
> drivers/raw/ioat/rte_ioat_rawdev_fns.h | 164 +++++++++++++++++++++++++
> 3 files changed, 171 insertions(+), 138 deletions(-)
> create mode 100644 drivers/raw/ioat/rte_ioat_rawdev_fns.h
>
<snip>
> diff --git a/drivers/raw/ioat/rte_ioat_rawdev.h b/drivers/raw/ioat/rte_ioat_rawdev.h
> index 4bc6491d91..7ace5c085a 100644
> --- a/drivers/raw/ioat/rte_ioat_rawdev.h
> +++ b/drivers/raw/ioat/rte_ioat_rawdev.h
> @@ -14,12 +14,7 @@
> * @b EXPERIMENTAL: these structures and APIs may change without prior notice
> */
>
> -#include <x86intrin.h>
> -#include <rte_atomic.h>
> -#include <rte_memory.h>
> -#include <rte_memzone.h>
> -#include <rte_prefetch.h>
> -#include "rte_ioat_spec.h"
> +#include <rte_common.h>
>
> /** Name of the device driver */
> #define IOAT_PMD_RAWDEV_NAME rawdev_ioat
> @@ -38,38 +33,6 @@ struct rte_ioat_rawdev_config {
> bool hdls_disable; /**< if set, ignore user-supplied handle params */
> };
>
> -/**
> - * @internal
> - * Structure representing a device instance
> - */
> -struct rte_ioat_rawdev {
> - struct rte_rawdev *rawdev;
> - const struct rte_memzone *mz;
> - const struct rte_memzone *desc_mz;
> -
> - volatile struct rte_ioat_registers *regs;
> - phys_addr_t status_addr;
> - phys_addr_t ring_addr;
> -
> - unsigned short ring_size;
> - struct rte_ioat_generic_hw_desc *desc_ring;
> - bool hdls_disable;
> - __m128i *hdls; /* completion handles for returning to user */
> -
> -
> - unsigned short next_read;
> - unsigned short next_write;
> -
> - /* some statistics for tracking, if added/changed update xstats fns*/
> - uint64_t enqueue_failed __rte_cache_aligned;
> - uint64_t enqueued;
> - uint64_t started;
> - uint64_t completed;
> -
> - /* to report completions, the device will write status back here */
> - volatile uint64_t status __rte_cache_aligned;
> -};
> -
> /**
> * Enqueue a copy operation onto the ioat device
> *
> @@ -104,38 +67,7 @@ struct rte_ioat_rawdev {
> static inline int
> rte_ioat_enqueue_copy(int dev_id, phys_addr_t src, phys_addr_t dst,
> unsigned int length, uintptr_t src_hdl, uintptr_t dst_hdl,
> - int fence)
> -{
> - struct rte_ioat_rawdev *ioat = rte_rawdevs[dev_id].dev_private;
This assignment needs to be type cast to "struct rte_ioat_rawdev *" for
C++ compilation compatibility.
There are a number of occurrences of this in this patch.
> - unsigned short read = ioat->next_read;
> - unsigned short write = ioat->next_write;
> - unsigned short mask = ioat->ring_size - 1;
> - unsigned short space = mask + read - write;
> - struct rte_ioat_generic_hw_desc *desc;
> -
> - if (space == 0) {
> - ioat->enqueue_failed++;
> - return 0;
> - }
> -
> - ioat->next_write = write + 1;
> - write &= mask;
> -
> - desc = &ioat->desc_ring[write];
> - desc->size = length;
> - /* set descriptor write-back every 16th descriptor */
> - desc->u.control_raw = (uint32_t)((!!fence << 4) | (!(write & 0xF)) << 3);
> - desc->src_addr = src;
> - desc->dest_addr = dst;
> - if (!ioat->hdls_disable)
> - ioat->hdls[write] = _mm_set_epi64x((int64_t)dst_hdl,
> - (int64_t)src_hdl);
> -
> - rte_prefetch0(&ioat->desc_ring[ioat->next_write & mask]);
> -
> - ioat->enqueued++;
> - return 1;
> -}
> + int fence);
>
<snip>
> +/**
> + * Returns details of copy operations that have been completed
> + */
> +static inline int
> +rte_ioat_completed_copies(int dev_id, uint8_t max_copies,
> + uintptr_t *src_hdls, uintptr_t *dst_hdls)
> +{
> + struct rte_ioat_rawdev *ioat = rte_rawdevs[dev_id].dev_private;
> + unsigned short mask = (ioat->ring_size - 1);
> + unsigned short read = ioat->next_read;
> + unsigned short end_read, count;
> + int error;
> + int i = 0;
> +
> + end_read = (rte_ioat_get_last_completed(ioat, &error) + 1) & mask;
> + count = (end_read - (read & mask)) & mask;
> +
> + if (error) {
> + rte_errno = EIO;
> + return -1;
> + }
> +
> + if (ioat->hdls_disable) {
> + read += count;
> + goto end;
> + }
> +
> + if (count > max_copies)
> + count = max_copies;
> +
> + for (; i < count - 1; i += 2, read += 2) {
> + __m128i hdls0 = _mm_load_si128(&ioat->hdls[read & mask]);
> + __m128i hdls1 = _mm_load_si128(&ioat->hdls[(read + 1) & mask]);
> +
> + _mm_storeu_si128((void *)&src_hdls[i],
> + _mm_unpacklo_epi64(hdls0, hdls1));
> + _mm_storeu_si128((void *)&dst_hdls[i],
> + _mm_unpackhi_epi64(hdls0, hdls1));
"src_hdls" and "dst_hdls" need to be type cast to "__m128i *" here for
C++ compatibility.
> + }
> + for (; i < count; i++, read++) {
> + uintptr_t *hdls = (void *)&ioat->hdls[read & mask];
Type cast for "ioat->hdls" to "__m128i *" needed here for C++ compatibility.
> + src_hdls[i] = hdls[0];
> + dst_hdls[i] = hdls[1];
> + }
> +
> +end:
> + ioat->next_read = read;
> + ioat->completed += count;
> + return count;
> +}
> +
> +#endif /* _RTE_IOAT_RAWDEV_FNS_H_ */
Thanks,
Kevin
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