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Commit 5d6ac29b authored by Herbert Xu's avatar Herbert Xu
Browse files

iscsi_tcp: Use ahash 



This patch replaces uses of the long obsolete hash interface with
ahash.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: default avatarMike Christie <michaelc@cs.wisc.edu>
parent 4a31340b

drivers/scsi/iscsi_tcp.c

+32 −22
Original line number Diff line number Diff line
@@ -26,12 +26,12 @@ 
 *	Zhenyu Wang

 */



#include <crypto/hash.h>

#include <linux/types.h>

#include <linux/inet.h>

#include <linux/slab.h>

#include <linux/file.h>

#include <linux/blkdev.h>

#include <linux/crypto.h>

#include <linux/delay.h>

#include <linux/kfifo.h>

#include <linux/scatterlist.h>
@@ -428,7 +428,7 @@ static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, 
	 * sufficient room.

	 */

	if (conn->hdrdgst_en) {

		iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,

		iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,

				      hdr + hdrlen);

		hdrlen += ISCSI_DIGEST_SIZE;

	}
@@ -454,7 +454,7 @@ iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, 
{

	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;

	struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;

	struct hash_desc *tx_hash = NULL;

	struct ahash_request *tx_hash = NULL;

	unsigned int hdr_spec_len;



	ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
@@ -467,7 +467,7 @@ iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, 
	WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));



	if (conn->datadgst_en)

		tx_hash = &tcp_sw_conn->tx_hash;

		tx_hash = tcp_sw_conn->tx_hash;



	return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,

				     sg, count, offset, len,
@@ -480,7 +480,7 @@ iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, 
{

	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;

	struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;

	struct hash_desc *tx_hash = NULL;

	struct ahash_request *tx_hash = NULL;

	unsigned int hdr_spec_len;



	ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
@@ -492,7 +492,7 @@ iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, 
	WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));



	if (conn->datadgst_en)

		tx_hash = &tcp_sw_conn->tx_hash;

		tx_hash = tcp_sw_conn->tx_hash;



	iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,

				data, len, NULL, tx_hash);
@@ -543,6 +543,7 @@ iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, 
	struct iscsi_cls_conn *cls_conn;

	struct iscsi_tcp_conn *tcp_conn;

	struct iscsi_sw_tcp_conn *tcp_sw_conn;

	struct crypto_ahash *tfm;



	cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),

					conn_idx);
@@ -552,23 +553,28 @@ iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, 
	tcp_conn = conn->dd_data;

	tcp_sw_conn = tcp_conn->dd_data;



	tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,

						     CRYPTO_ALG_ASYNC);

	tcp_sw_conn->tx_hash.flags = 0;

	if (IS_ERR(tcp_sw_conn->tx_hash.tfm))

	tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);

	if (IS_ERR(tfm))

		goto free_conn;



	tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,

						     CRYPTO_ALG_ASYNC);

	tcp_sw_conn->rx_hash.flags = 0;

	if (IS_ERR(tcp_sw_conn->rx_hash.tfm))

		goto free_tx_tfm;

	tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;

	tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);

	if (!tcp_sw_conn->tx_hash)

		goto free_tfm;

	ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);



	tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);

	if (!tcp_sw_conn->rx_hash)

		goto free_tx_hash;

	ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);



	tcp_conn->rx_hash = tcp_sw_conn->rx_hash;



	return cls_conn;



free_tx_tfm:

	crypto_free_hash(tcp_sw_conn->tx_hash.tfm);

free_tx_hash:

	ahash_request_free(tcp_sw_conn->tx_hash);

free_tfm:

	crypto_free_ahash(tfm);

free_conn:

	iscsi_conn_printk(KERN_ERR, conn,

			  "Could not create connection due to crc32c "
@@ -607,10 +613,14 @@ static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) 


	iscsi_sw_tcp_release_conn(conn);



	if (tcp_sw_conn->tx_hash.tfm)

		crypto_free_hash(tcp_sw_conn->tx_hash.tfm);

	if (tcp_sw_conn->rx_hash.tfm)

		crypto_free_hash(tcp_sw_conn->rx_hash.tfm);

	ahash_request_free(tcp_sw_conn->rx_hash);

	if (tcp_sw_conn->tx_hash) {

		struct crypto_ahash *tfm;



		tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);

		ahash_request_free(tcp_sw_conn->tx_hash);

		crypto_free_ahash(tfm);

	}



	iscsi_tcp_conn_teardown(cls_conn);

}

drivers/scsi/iscsi_tcp.h

+2 −2
Original line number Diff line number Diff line
@@ -45,8 +45,8 @@ struct iscsi_sw_tcp_conn { 
	void			(*old_write_space)(struct sock *);



	/* data and header digests */

	struct hash_desc	tx_hash;	/* CRC32C (Tx) */

	struct hash_desc	rx_hash;	/* CRC32C (Rx) */

	struct ahash_request	*tx_hash;	/* CRC32C (Tx) */

	struct ahash_request	*rx_hash;	/* CRC32C (Rx) */



	/* MIB custom statistics */

	uint32_t		sendpage_failures_cnt;

drivers/scsi/libiscsi_tcp.c

+17 −12
Original line number Diff line number Diff line
@@ -26,13 +26,13 @@ 
 *	Zhenyu Wang

 */



#include <crypto/hash.h>

#include <linux/types.h>

#include <linux/list.h>

#include <linux/inet.h>

#include <linux/slab.h>

#include <linux/file.h>

#include <linux/blkdev.h>

#include <linux/crypto.h>

#include <linux/delay.h>

#include <linux/kfifo.h>

#include <linux/scatterlist.h>
@@ -214,7 +214,8 @@ int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, 
		} else

			sg_init_one(&sg, segment->data + segment->copied,

				    copied);

		crypto_hash_update(segment->hash, &sg, copied);

		ahash_request_set_crypt(segment->hash, &sg, NULL, copied);

		crypto_ahash_update(segment->hash);

	}



	segment->copied += copied;
@@ -260,7 +261,9 @@ int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, 
	 * is completely handled in hdr done function.

	 */

	if (segment->hash) {

		crypto_hash_final(segment->hash, segment->digest);

		ahash_request_set_crypt(segment->hash, NULL,

					segment->digest, 0);

		crypto_ahash_final(segment->hash);

		iscsi_tcp_segment_splice_digest(segment,

				 recv ? segment->recv_digest : segment->digest);

		return 0;
@@ -310,13 +313,14 @@ iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, 
}



inline void

iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen,

		      unsigned char digest[ISCSI_DIGEST_SIZE])

iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr,

		      size_t hdrlen, unsigned char digest[ISCSI_DIGEST_SIZE])

{

	struct scatterlist sg;



	sg_init_one(&sg, hdr, hdrlen);

	crypto_hash_digest(hash, &sg, hdrlen, digest);

	ahash_request_set_crypt(hash, &sg, digest, hdrlen);

	crypto_ahash_digest(hash);

}

EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header);
@@ -341,7 +345,7 @@ iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, 
 */

static inline void

__iscsi_segment_init(struct iscsi_segment *segment, size_t size,

		     iscsi_segment_done_fn_t *done, struct hash_desc *hash)

		     iscsi_segment_done_fn_t *done, struct ahash_request *hash)

{

	memset(segment, 0, sizeof(*segment));

	segment->total_size = size;
@@ -349,14 +353,14 @@ __iscsi_segment_init(struct iscsi_segment *segment, size_t size, 


	if (hash) {

		segment->hash = hash;

		crypto_hash_init(hash);

		crypto_ahash_init(hash);

	}

}



inline void

iscsi_segment_init_linear(struct iscsi_segment *segment, void *data,

			  size_t size, iscsi_segment_done_fn_t *done,

			  struct hash_desc *hash)

			  struct ahash_request *hash)

{

	__iscsi_segment_init(segment, size, done, hash);

	segment->data = data;
@@ -368,7 +372,8 @@ inline int 
iscsi_segment_seek_sg(struct iscsi_segment *segment,

		      struct scatterlist *sg_list, unsigned int sg_count,

		      unsigned int offset, size_t size,

		      iscsi_segment_done_fn_t *done, struct hash_desc *hash)

		      iscsi_segment_done_fn_t *done,

		      struct ahash_request *hash)

{

	struct scatterlist *sg;

	unsigned int i;
@@ -431,7 +436,7 @@ static void 
iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn)

{

	struct iscsi_conn *conn = tcp_conn->iscsi_conn;

	struct hash_desc *rx_hash = NULL;

	struct ahash_request *rx_hash = NULL;



	if (conn->datadgst_en &&

	    !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
@@ -686,7 +691,7 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 


		if (tcp_conn->in.datalen) {

			struct iscsi_tcp_task *tcp_task = task->dd_data;

			struct hash_desc *rx_hash = NULL;

			struct ahash_request *rx_hash = NULL;

			struct scsi_data_buffer *sdb = scsi_in(task->sc);



			/*

include/scsi/libiscsi_tcp.h

+7 −6
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ 
struct iscsi_tcp_conn;

struct iscsi_segment;

struct sk_buff;

struct hash_desc;

struct ahash_request;



typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *,

				    struct iscsi_segment *);
@@ -38,7 +38,7 @@ struct iscsi_segment { 
	unsigned int		total_size;

	unsigned int		total_copied;



	struct hash_desc	*hash;

	struct ahash_request	*hash;

	unsigned char		padbuf[ISCSI_PAD_LEN];

	unsigned char		recv_digest[ISCSI_DIGEST_SIZE];

	unsigned char		digest[ISCSI_DIGEST_SIZE];
@@ -73,7 +73,7 @@ struct iscsi_tcp_conn { 
	/* control data */

	struct iscsi_tcp_recv	in;		/* TCP receive context */

	/* CRC32C (Rx) LLD should set this is they do not offload */

	struct hash_desc	*rx_hash;

	struct ahash_request	*rx_hash;

};



struct iscsi_tcp_task {
@@ -111,15 +111,16 @@ extern void iscsi_tcp_segment_unmap(struct iscsi_segment *segment); 
extern void iscsi_segment_init_linear(struct iscsi_segment *segment,

				      void *data, size_t size,

				      iscsi_segment_done_fn_t *done,

				      struct hash_desc *hash);

				      struct ahash_request *hash);

extern int

iscsi_segment_seek_sg(struct iscsi_segment *segment,

		      struct scatterlist *sg_list, unsigned int sg_count,

		      unsigned int offset, size_t size,

		      iscsi_segment_done_fn_t *done, struct hash_desc *hash);

		      iscsi_segment_done_fn_t *done,

		      struct ahash_request *hash);



/* digest helpers */

extern void iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr,

extern void iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr,

				  size_t hdrlen,

				  unsigned char digest[ISCSI_DIGEST_SIZE]);

extern struct iscsi_cls_conn *