[PATCH v9 01/19] crypto: acomp - Remove request chaining

[Kanchana P Sridhar <kanchana.p.sridhar@intel.com>]

Request chaining requires the user to do too much book keeping.
Remove it from acomp.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 crypto/acompress.c                  | 117 ++++++++--------------------
 crypto/scompress.c                  |  18 +----
 include/crypto/acompress.h          |  14 ----
 include/crypto/internal/acompress.h |   5 --
 4 files changed, 35 insertions(+), 119 deletions(-)

diff --git a/crypto/acompress.c b/crypto/acompress.c
index f7a3fbe5447e..82fb3c04e68f 100644
--- a/crypto/acompress.c
+++ b/crypto/acompress.c
@@ -161,7 +161,6 @@ static void acomp_save_req(struct acomp_req *req, crypto_completion_t cplt)
 	state->data = req->base.data;
 	req->base.complete = cplt;
 	req->base.data = state;
-	state->req0 = req;
 }
 
 static void acomp_restore_req(struct acomp_req *req)
@@ -172,23 +171,20 @@ static void acomp_restore_req(struct acomp_req *req)
 	req->base.data = state->data;
 }
 
-static void acomp_reqchain_virt(struct acomp_req_chain *state, int err)
+static void acomp_reqchain_virt(struct acomp_req *req)
 {
-	struct acomp_req *req = state->cur;
+	struct acomp_req_chain *state = &req->chain;
 	unsigned int slen = req->slen;
 	unsigned int dlen = req->dlen;
 
-	req->base.err = err;
-	state = &req->chain;
-
 	if (state->flags & CRYPTO_ACOMP_REQ_SRC_VIRT)
 		acomp_request_set_src_dma(req, state->src, slen);
 	else if (state->flags & CRYPTO_ACOMP_REQ_SRC_FOLIO)
-		acomp_request_set_src_folio(req, state->sfolio, state->soff, slen);
+		acomp_request_set_src_folio(req, state->sfolio, req->soff, slen);
 	if (state->flags & CRYPTO_ACOMP_REQ_DST_VIRT)
 		acomp_request_set_dst_dma(req, state->dst, dlen);
 	else if (state->flags & CRYPTO_ACOMP_REQ_DST_FOLIO)
-		acomp_request_set_dst_folio(req, state->dfolio, state->doff, dlen);
+		acomp_request_set_dst_folio(req, state->dfolio, req->doff, dlen);
 }
 
 static void acomp_virt_to_sg(struct acomp_req *req)
@@ -213,7 +209,6 @@ static void acomp_virt_to_sg(struct acomp_req *req)
 		size_t off = req->soff;
 
 		state->sfolio = folio;
-		state->soff = off;
 		sg_init_table(&state->ssg, 1);
 		sg_set_page(&state->ssg, folio_page(folio, off / PAGE_SIZE),
 			    slen, off % PAGE_SIZE);
@@ -233,7 +228,6 @@ static void acomp_virt_to_sg(struct acomp_req *req)
 		size_t off = req->doff;
 
 		state->dfolio = folio;
-		state->doff = off;
 		sg_init_table(&state->dsg, 1);
 		sg_set_page(&state->dsg, folio_page(folio, off / PAGE_SIZE),
 			    dlen, off % PAGE_SIZE);
@@ -241,8 +235,7 @@ static void acomp_virt_to_sg(struct acomp_req *req)
 	}
 }
 
-static int acomp_do_nondma(struct acomp_req_chain *state,
-			   struct acomp_req *req)
+static int acomp_do_nondma(struct acomp_req *req, bool comp)
 {
 	u32 keep = CRYPTO_ACOMP_REQ_SRC_VIRT |
 		   CRYPTO_ACOMP_REQ_SRC_NONDMA |
@@ -259,7 +252,7 @@ static int acomp_do_nondma(struct acomp_req_chain *state,
 	fbreq->slen = req->slen;
 	fbreq->dlen = req->dlen;
 
-	if (state->op == crypto_acomp_reqtfm(req)->compress)
+	if (comp)
 		err = crypto_acomp_compress(fbreq);
 	else
 		err = crypto_acomp_decompress(fbreq);
@@ -268,114 +261,70 @@ static int acomp_do_nondma(struct acomp_req_chain *state,
 	return err;
 }
 
-static int acomp_do_one_req(struct acomp_req_chain *state,
-			    struct acomp_req *req)
+static int acomp_do_one_req(struct acomp_req *req, bool comp)
 {
-	state->cur = req;
-
 	if (acomp_request_isnondma(req))
-		return acomp_do_nondma(state, req);
+		return acomp_do_nondma(req, comp);
 
 	acomp_virt_to_sg(req);
-	return state->op(req);
+	return comp ? crypto_acomp_reqtfm(req)->compress(req) :
+		      crypto_acomp_reqtfm(req)->decompress(req);
 }
 
-static int acomp_reqchain_finish(struct acomp_req *req0, int err, u32 mask)
+static int acomp_reqchain_finish(struct acomp_req *req, int err)
 {
-	struct acomp_req_chain *state = req0->base.data;
-	struct acomp_req *req = state->cur;
-	struct acomp_req *n;
-
-	acomp_reqchain_virt(state, err);
-
-	if (req != req0)
-		list_add_tail(&req->base.list, &req0->base.list);
-
-	list_for_each_entry_safe(req, n, &state->head, base.list) {
-		list_del_init(&req->base.list);
-
-		req->base.flags &= mask;
-		req->base.complete = acomp_reqchain_done;
-		req->base.data = state;
-
-		err = acomp_do_one_req(state, req);
-
-		if (err == -EINPROGRESS) {
-			if (!list_empty(&state->head))
-				err = -EBUSY;
-			goto out;
-		}
-
-		if (err == -EBUSY)
-			goto out;
-
-		acomp_reqchain_virt(state, err);
-		list_add_tail(&req->base.list, &req0->base.list);
-	}
-
-	acomp_restore_req(req0);
-
-out:
+	acomp_reqchain_virt(req);
+	acomp_restore_req(req);
 	return err;
 }
 
 static void acomp_reqchain_done(void *data, int err)
 {
-	struct acomp_req_chain *state = data;
-	crypto_completion_t compl = state->compl;
+	struct acomp_req *req = data;
+	crypto_completion_t compl;
 
-	data = state->data;
+	compl = req->chain.compl;
+	data = req->chain.data;
 
-	if (err == -EINPROGRESS) {
-		if (!list_empty(&state->head))
-			return;
+	if (err == -EINPROGRESS)
 		goto notify;
-	}
 
-	err = acomp_reqchain_finish(state->req0, err,
-				    CRYPTO_TFM_REQ_MAY_BACKLOG);
-	if (err == -EBUSY)
-		return;
+	err = acomp_reqchain_finish(req, err);
 
 notify:
 	compl(data, err);
 }
 
-static int acomp_do_req_chain(struct acomp_req *req,
-			      int (*op)(struct acomp_req *req))
+static int acomp_do_req_chain(struct acomp_req *req, bool comp)
 {
-	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
-	struct acomp_req_chain *state;
 	int err;
 
-	if (crypto_acomp_req_chain(tfm) ||
-	    (!acomp_request_chained(req) && acomp_request_issg(req)))
-		return op(req);
-
 	acomp_save_req(req, acomp_reqchain_done);
-	state = req->base.data;
 
-	state->op = op;
-	state->src = NULL;
-	INIT_LIST_HEAD(&state->head);
-	list_splice_init(&req->base.list, &state->head);
-
-	err = acomp_do_one_req(state, req);
+	err = acomp_do_one_req(req, comp);
 	if (err == -EBUSY || err == -EINPROGRESS)
-		return -EBUSY;
+		return err;
 
-	return acomp_reqchain_finish(req, err, ~0);
+	return acomp_reqchain_finish(req, err);
 }
 
 int crypto_acomp_compress(struct acomp_req *req)
 {
-	return acomp_do_req_chain(req, crypto_acomp_reqtfm(req)->compress);
+	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
+
+	if (crypto_acomp_req_chain(tfm) || acomp_request_issg(req))
+		crypto_acomp_reqtfm(req)->compress(req);
+	return acomp_do_req_chain(req, true);
 }
 EXPORT_SYMBOL_GPL(crypto_acomp_compress);
 
 int crypto_acomp_decompress(struct acomp_req *req)
 {
-	return acomp_do_req_chain(req, crypto_acomp_reqtfm(req)->decompress);
+	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
+
+	if (crypto_acomp_req_chain(tfm) || acomp_request_issg(req))
+		crypto_acomp_reqtfm(req)->decompress(req);
+	return acomp_do_req_chain(req, false);
 }
 EXPORT_SYMBOL_GPL(crypto_acomp_decompress);
 
diff --git a/crypto/scompress.c b/crypto/scompress.c
index 5762fcc63b51..c1ce12564299 100644
--- a/crypto/scompress.c
+++ b/crypto/scompress.c
@@ -293,28 +293,14 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
 	return ret;
 }
 
-static int scomp_acomp_chain(struct acomp_req *req, int dir)
-{
-	struct acomp_req *r2;
-	int err;
-
-	err = scomp_acomp_comp_decomp(req, dir);
-	req->base.err = err;
-
-	list_for_each_entry(r2, &req->base.list, base.list)
-		r2->base.err = scomp_acomp_comp_decomp(r2, dir);
-
-	return err;
-}
-
 static int scomp_acomp_compress(struct acomp_req *req)
 {
-	return scomp_acomp_chain(req, 1);
+	return scomp_acomp_comp_decomp(req, 1);
 }
 
 static int scomp_acomp_decompress(struct acomp_req *req)
 {
-	return scomp_acomp_chain(req, 0);
+	return scomp_acomp_comp_decomp(req, 0);
 }
 
 static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index c497c73baf13..267d557daeb1 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -52,10 +52,6 @@ struct acomp_req;
 struct folio;
 
 struct acomp_req_chain {
-	struct list_head head;
-	struct acomp_req *req0;
-	struct acomp_req *cur;
-	int (*op)(struct acomp_req *req);
 	crypto_completion_t compl;
 	void *data;
 	struct scatterlist ssg;
@@ -68,8 +64,6 @@ struct acomp_req_chain {
 		u8 *dst;
 		struct folio *dfolio;
 	};
-	size_t soff;
-	size_t doff;
 	u32 flags;
 };
 
@@ -349,8 +343,6 @@ static inline void acomp_request_set_callback(struct acomp_req *req,
 	req->base.data = data;
 	req->base.flags &= keep;
 	req->base.flags |= flgs & ~keep;
-
-	crypto_reqchain_init(&req->base);
 }
 
 /**
@@ -558,12 +550,6 @@ static inline void acomp_request_set_dst_folio(struct acomp_req *req,
 	req->base.flags |= CRYPTO_ACOMP_REQ_DST_FOLIO;
 }
 
-static inline void acomp_request_chain(struct acomp_req *req,
-				       struct acomp_req *head)
-{
-	crypto_request_chain(&req->base, &head->base);
-}
-
 /**
  * crypto_acomp_compress() -- Invoke asynchronous compress operation
  *
diff --git a/include/crypto/internal/acompress.h b/include/crypto/internal/acompress.h
index aaf59f3236fa..b69d818d7e68 100644
--- a/include/crypto/internal/acompress.h
+++ b/include/crypto/internal/acompress.h
@@ -98,11 +98,6 @@ void crypto_unregister_acomp(struct acomp_alg *alg);
 int crypto_register_acomps(struct acomp_alg *algs, int count);
 void crypto_unregister_acomps(struct acomp_alg *algs, int count);
 
-static inline bool acomp_request_chained(struct acomp_req *req)
-{
-	return crypto_request_chained(&req->base);
-}
-
 static inline bool acomp_request_issg(struct acomp_req *req)
 {
 	return !(req->base.flags & (CRYPTO_ACOMP_REQ_SRC_VIRT |
-- 
2.27.0