[RFC PATCH 02/21] crypto: qat - Drop support for allocating destination buffers

Ard Biesheuvel
2023-07-18T12:59:37Z

Remove the logic that allocates the destination scatterlist and backing
pages on the fly when no destination is provided: this is a rather
dubious proposition, given that the caller is in a far better position
to estimate the size of such a buffer, or how it should be allocated.

This feature has no current users, so let's remove it while we still
can.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
drivers/crypto/intel/qat/qat_common/qat_bl.c | 159 --------------------
drivers/crypto/intel/qat/qat_common/qat_bl.h | 6 -
drivers/crypto/intel/qat/qat_common/qat_comp_algs.c | 86 +----------
drivers/crypto/intel/qat/qat_common/qat_comp_req.h | 10 --
4 files changed, 1 insertion(+), 260 deletions(-)

diff --git a/drivers/crypto/intel/qat/qat_common/qat_bl.c b/drivers/crypto/intel/qat/qat_common/qat_bl.c
index 76baed0a76c0ee93..94f6a5fe0f3dea75 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_bl.c
+++ b/drivers/crypto/intel/qat/qat_common/qat_bl.c
@@ -249,162 +249,3 @@ int qat_bl_sgl_to_bufl(struct adf_accel_dev *accel_dev,
extra_dst_buff, sz_extra_dst_buff,
sskip, dskip, flags);
}
-
-static void qat_bl_sgl_unmap(struct adf_accel_dev *accel_dev,
- struct qat_alg_buf_list *bl)
-{
- struct device *dev = &GET_DEV(accel_dev);
- int n = bl->num_bufs;
- int i;
-
- for (i = 0; i < n; i++)
- if (!dma_mapping_error(dev, bl->buffers[i].addr))
- dma_unmap_single(dev, bl->buffers[i].addr,
- bl->buffers[i].len, DMA_FROM_DEVICE);
-}
-
-static int qat_bl_sgl_map(struct adf_accel_dev *accel_dev,
- struct scatterlist *sgl,
- struct qat_alg_buf_list **bl)
-{
- struct device *dev = &GET_DEV(accel_dev);
- struct qat_alg_buf_list *bufl;
- int node = dev_to_node(dev);
- struct scatterlist *sg;
- int n, i, sg_nctr;
- size_t sz;
-
- n = sg_nents(sgl);
- sz = struct_size(bufl, buffers, n);
- bufl = kzalloc_node(sz, GFP_KERNEL, node);
- if (unlikely(!bufl))
- return -ENOMEM;
-
- for (i = 0; i < n; i++)
- bufl->buffers[i].addr = DMA_MAPPING_ERROR;
-
- sg_nctr = 0;
- for_each_sg(sgl, sg, n, i) {
- int y = sg_nctr;
-
- if (!sg->length)
- continue;
-
- bufl->buffers[y].addr = dma_map_single(dev, sg_virt(sg),
- sg->length,
- DMA_FROM_DEVICE);
- bufl->buffers[y].len = sg->length;
- if (unlikely(dma_mapping_error(dev, bufl->buffers[y].addr)))
- goto err_map;
- sg_nctr++;
- }
- bufl->num_bufs = sg_nctr;
- bufl->num_mapped_bufs = sg_nctr;
-
- *bl = bufl;
-
- return 0;
-
-err_map:
- for (i = 0; i < n; i++)
- if (!dma_mapping_error(dev, bufl->buffers[i].addr))
- dma_unmap_single(dev, bufl->buffers[i].addr,
- bufl->buffers[i].len,
- DMA_FROM_DEVICE);
- kfree(bufl);
- *bl = NULL;
-
- return -ENOMEM;
-}
-
-static void qat_bl_sgl_free_unmap(struct adf_accel_dev *accel_dev,
- struct scatterlist *sgl,
- struct qat_alg_buf_list *bl,
- bool free_bl)
-{
- if (bl) {
- qat_bl_sgl_unmap(accel_dev, bl);
-
- if (free_bl)
- kfree(bl);
- }
- if (sgl)
- sgl_free(sgl);
-}
-
-static int qat_bl_sgl_alloc_map(struct adf_accel_dev *accel_dev,
- struct scatterlist **sgl,
- struct qat_alg_buf_list **bl,
- unsigned int dlen,
- gfp_t gfp)
-{
- struct scatterlist *dst;
- int ret;
-
- dst = sgl_alloc(dlen, gfp, NULL);
- if (!dst) {
- dev_err(&GET_DEV(accel_dev), "sg_alloc failed\n");
- return -ENOMEM;
- }
-
- ret = qat_bl_sgl_map(accel_dev, dst, bl);
- if (ret)
- goto err;
-
- *sgl = dst;
-
- return 0;
-
-err:
- sgl_free(dst);
- *sgl = NULL;
- return ret;
-}
-
-int qat_bl_realloc_map_new_dst(struct adf_accel_dev *accel_dev,
- struct scatterlist **sg,
- unsigned int dlen,
- struct qat_request_buffs *qat_bufs,
- gfp_t gfp)
-{
- struct device *dev = &GET_DEV(accel_dev);
- dma_addr_t new_blp = DMA_MAPPING_ERROR;
- struct qat_alg_buf_list *new_bl;
- struct scatterlist *new_sg;
- size_t new_bl_size;
- int ret;
-
- ret = qat_bl_sgl_alloc_map(accel_dev, &new_sg, &new_bl, dlen, gfp);
- if (ret)
- return ret;
-
- new_bl_size = struct_size(new_bl, buffers, new_bl->num_bufs);
-
- /* Map new firmware SGL descriptor */
- new_blp = dma_map_single(dev, new_bl, new_bl_size, DMA_TO_DEVICE);
- if (unlikely(dma_mapping_error(dev, new_blp)))
- goto err;
-
- /* Unmap old firmware SGL descriptor */
- dma_unmap_single(dev, qat_bufs->bloutp, qat_bufs->sz_out, DMA_TO_DEVICE);
-
- /* Free and unmap old scatterlist */
- qat_bl_sgl_free_unmap(accel_dev, *sg, qat_bufs->blout,
- !qat_bufs->sgl_dst_valid);
-
- qat_bufs->sgl_dst_valid = false;
- qat_bufs->blout = new_bl;
- qat_bufs->bloutp = new_blp;
- qat_bufs->sz_out = new_bl_size;
-
- *sg = new_sg;
-
- return 0;
-err:
- qat_bl_sgl_free_unmap(accel_dev, new_sg, new_bl, true);
-
- if (!dma_mapping_error(dev, new_blp))
- dma_unmap_single(dev, new_blp, new_bl_size, DMA_TO_DEVICE);
-
- return -ENOMEM;
-}
diff --git a/drivers/crypto/intel/qat/qat_common/qat_bl.h b/drivers/crypto/intel/qat/qat_common/qat_bl.h
index d87e4f35ac395c76..a508d795113116c0 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_bl.h
+++ b/drivers/crypto/intel/qat/qat_common/qat_bl.h
@@ -60,10 +60,4 @@ static inline gfp_t qat_algs_alloc_flags(struct crypto_async_request *req)
return req->flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL : GFP_ATOMIC;
}

-int qat_bl_realloc_map_new_dst(struct adf_accel_dev *accel_dev,
- struct scatterlist **newd,
- unsigned int dlen,
- struct qat_request_buffs *qat_bufs,
- gfp_t gfp);
-
#endif
diff --git a/drivers/crypto/intel/qat/qat_common/qat_comp_algs.c b/drivers/crypto/intel/qat/qat_common/qat_comp_algs.c
index b533984906ece67a..09e00037b0165793 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_comp_algs.c
+++ b/drivers/crypto/intel/qat/qat_common/qat_comp_algs.c
@@ -38,11 +38,6 @@ struct qat_compression_ctx {
int (*qat_comp_callback)(struct qat_compression_req *qat_req, void *resp);
};

-struct qat_dst {
- bool is_null;
- int resubmitted;
-};
-
struct qat_compression_req {
u8 req[QAT_COMP_REQ_SIZE];
struct qat_compression_ctx *qat_compression_ctx;
@@ -51,8 +46,6 @@ struct qat_compression_req {
enum direction dir;
int actual_dlen;
struct qat_alg_req alg_req;
- struct work_struct resubmit;
- struct qat_dst dst;
};

static int qat_alg_send_dc_message(struct qat_compression_req *qat_req,
@@ -69,46 +62,6 @@ static int qat_alg_send_dc_message(struct qat_compression_req *qat_req,
return qat_alg_send_message(alg_req);
}

-static void qat_comp_resubmit(struct work_struct *work)
-{
- struct qat_compression_req *qat_req =
- container_of(work, struct qat_compression_req, resubmit);
- struct qat_compression_ctx *ctx = qat_req->qat_compression_ctx;
- struct adf_accel_dev *accel_dev = ctx->inst->accel_dev;
- struct qat_request_buffs *qat_bufs = &qat_req->buf;
- struct qat_compression_instance *inst = ctx->inst;
- struct acomp_req *areq = qat_req->acompress_req;
- struct crypto_acomp *tfm = crypto_acomp_reqtfm(areq);
- unsigned int dlen = CRYPTO_ACOMP_DST_MAX;
- u8 *req = qat_req->req;
- dma_addr_t dfbuf;
- int ret;
-
- areq->dlen = dlen;
-
- dev_dbg(&GET_DEV(accel_dev), "[%s][%s] retry NULL dst request - dlen = %d\n",
- crypto_tfm_alg_driver_name(crypto_acomp_tfm(tfm)),
- qat_req->dir == COMPRESSION ? "comp" : "decomp", dlen);
-
- ret = qat_bl_realloc_map_new_dst(accel_dev, &areq->dst, dlen, qat_bufs,
- qat_algs_alloc_flags(&areq->base));
- if (ret)
- goto err;
-
- qat_req->dst.resubmitted = true;
-
- dfbuf = qat_req->buf.bloutp;
- qat_comp_override_dst(req, dfbuf, dlen);
-
- ret = qat_alg_send_dc_message(qat_req, inst, &areq->base);
- if (ret != -ENOSPC)
- return;
-
-err:
- qat_bl_free_bufl(accel_dev, qat_bufs);
- acomp_request_complete(areq, ret);
-}
-
static int parse_zlib_header(u16 zlib_h)
{
int ret = -EINVAL;
@@ -203,21 +156,6 @@ static void qat_comp_generic_callback(struct qat_compression_req *qat_req,

areq->dlen = 0;

- if (qat_req->dir == DECOMPRESSION && qat_req->dst.is_null) {
- if (cmp_err == ERR_CODE_OVERFLOW_ERROR) {
- if (qat_req->dst.resubmitted) {
- dev_dbg(&GET_DEV(accel_dev),
- "Output does not fit destination buffer\n");
- res = -EOVERFLOW;
- goto end;
- }
-
- INIT_WORK(&qat_req->resubmit, qat_comp_resubmit);
- adf_misc_wq_queue_work(&qat_req->resubmit);
- return;
- }
- }
-
if (unlikely(status != ICP_QAT_FW_COMN_STATUS_FLAG_OK))
goto end;

@@ -329,29 +267,9 @@ static int qat_comp_alg_compress_decompress(struct acomp_req *areq, enum directi
if (!areq->src || !slen)
return -EINVAL;

- if (areq->dst && !dlen)
+ if (!areq->dst || !dlen)
return -EINVAL;

- qat_req->dst.is_null = false;
-
- /* Handle acomp requests that require the allocation of a destination
- * buffer. The size of the destination buffer is double the source
- * buffer (rounded up to the size of a page) to fit the decompressed
- * output or an expansion on the data for compression.
- */
- if (!areq->dst) {
- qat_req->dst.is_null = true;
-
- dlen = round_up(2 * slen, PAGE_SIZE);
- areq->dst = sgl_alloc(dlen, f, NULL);
- if (!areq->dst)
- return -ENOMEM;
-
- dlen -= dhdr + dftr;
- areq->dlen = dlen;
- qat_req->dst.resubmitted = false;
- }
-
if (dir == COMPRESSION) {
params.extra_dst_buff = inst->dc_data->ovf_buff_p;
ovf_buff_sz = inst->dc_data->ovf_buff_sz;
@@ -450,7 +368,6 @@ static struct acomp_alg qat_acomp[] = { {
.exit = qat_comp_alg_exit_tfm,
.compress = qat_comp_alg_compress,
.decompress = qat_comp_alg_decompress,
- .dst_free = sgl_free,
.reqsize = sizeof(struct qat_compression_req),
}, {
.base = {
@@ -465,7 +382,6 @@ static struct acomp_alg qat_acomp[] = { {
.exit = qat_comp_alg_exit_tfm,
.compress = qat_comp_alg_rfc1950_compress,
.decompress = qat_comp_alg_rfc1950_decompress,
- .dst_free = sgl_free,
.reqsize = sizeof(struct qat_compression_req),
} };

diff --git a/drivers/crypto/intel/qat/qat_common/qat_comp_req.h b/drivers/crypto/intel/qat/qat_common/qat_comp_req.h
index 404e32c5e77838df..18a1f33a6db98e8c 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_comp_req.h
+++ b/drivers/crypto/intel/qat/qat_common/qat_comp_req.h
@@ -25,16 +25,6 @@ static inline void qat_comp_create_req(void *ctx, void *req, u64 src, u32 slen,
req_pars->out_buffer_sz = dlen;
}

-static inline void qat_comp_override_dst(void *req, u64 dst, u32 dlen)
-{
- struct icp_qat_fw_comp_req *fw_req = req;
- struct icp_qat_fw_comp_req_params *req_pars = &fw_req->comp_pars;
-
- fw_req->comn_mid.dest_data_addr = dst;
- fw_req->comn_mid.dst_length = dlen;
- req_pars->out_buffer_sz = dlen;
-}
-
static inline void qat_comp_create_compression_req(void *ctx, void *req,
u64 src, u32 slen,
u64 dst, u32 dlen,
--
2.39.2