[2/3] crypto/nitrox: support AES-GCM
diff mbox series

Message ID 20200724110007.41303-3-rnagadheeraj@marvell.com
State Under Review
Delegated to: akhil goyal
Headers show
Series
  • Add AES-GCM and cipher only offload support
Related show

Checks

Context Check Description
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Nagadheeraj Rottela July 24, 2020, 11 a.m. UTC
This patch adds AES-GCM AEAD algorithm.

Signed-off-by: Nagadheeraj Rottela <rnagadheeraj@marvell.com>
---
 doc/guides/cryptodevs/features/nitrox.ini     |   3 +
 doc/guides/cryptodevs/nitrox.rst              |   4 +
 drivers/crypto/nitrox/nitrox_sym.c            |  82 +++++++-
 .../crypto/nitrox/nitrox_sym_capabilities.c   |  30 +++
 drivers/crypto/nitrox/nitrox_sym_ctx.h        |   5 +-
 drivers/crypto/nitrox/nitrox_sym_reqmgr.c     | 182 +++++++++++++++---
 6 files changed, 268 insertions(+), 38 deletions(-)

Patch
diff mbox series

diff --git a/doc/guides/cryptodevs/features/nitrox.ini b/doc/guides/cryptodevs/features/nitrox.ini
index 183494731..a1d6bcb4f 100644
--- a/doc/guides/cryptodevs/features/nitrox.ini
+++ b/doc/guides/cryptodevs/features/nitrox.ini
@@ -34,6 +34,9 @@  SHA256 HMAC  = Y
 ; Supported AEAD algorithms of the 'nitrox' crypto driver.
 ;
 [AEAD]
+AES GCM (128)  = Y
+AES GCM (192)  = Y
+AES GCM (256)  = Y
 
 ;
 ; Supported Asymmetric algorithms of the 'nitrox' crypto driver.
diff --git a/doc/guides/cryptodevs/nitrox.rst b/doc/guides/cryptodevs/nitrox.rst
index 85f5212b6..91fca905a 100644
--- a/doc/guides/cryptodevs/nitrox.rst
+++ b/doc/guides/cryptodevs/nitrox.rst
@@ -26,6 +26,10 @@  Hash algorithms:
 * ``RTE_CRYPTO_AUTH_SHA224_HMAC``
 * ``RTE_CRYPTO_AUTH_SHA256_HMAC``
 
+Supported AEAD algorithms:
+
+* ``RTE_CRYPTO_AEAD_AES_GCM``
+
 Limitations
 -----------
 
diff --git a/drivers/crypto/nitrox/nitrox_sym.c b/drivers/crypto/nitrox/nitrox_sym.c
index fad4a7a48..fe3ee6e23 100644
--- a/drivers/crypto/nitrox/nitrox_sym.c
+++ b/drivers/crypto/nitrox/nitrox_sym.c
@@ -20,6 +20,7 @@ 
 #define NPS_PKT_IN_INSTR_SIZE 64
 #define IV_FROM_DPTR 1
 #define FLEXI_CRYPTO_ENCRYPT_HMAC 0x33
+#define FLEXI_CRYPTO_MAX_AAD_LEN 512
 #define AES_KEYSIZE_128 16
 #define AES_KEYSIZE_192 24
 #define AES_KEYSIZE_256 32
@@ -297,6 +298,9 @@  get_crypto_chain_order(const struct rte_crypto_sym_xform *xform)
 			}
 		}
 		break;
+	case RTE_CRYPTO_SYM_XFORM_AEAD:
+		res = NITROX_CHAIN_COMBINED;
+		break;
 	default:
 		break;
 	}
@@ -431,17 +435,17 @@  get_flexi_auth_type(enum rte_crypto_auth_algorithm algo)
 }
 
 static bool
-auth_key_digest_is_valid(struct rte_crypto_auth_xform *xform,
-			 struct flexi_crypto_context *fctx)
+auth_key_is_valid(const uint8_t *data, uint16_t length,
+		  struct flexi_crypto_context *fctx)
 {
-	if (unlikely(!xform->key.data && xform->key.length)) {
+	if (unlikely(!data && length)) {
 		NITROX_LOG(ERR, "Invalid auth key\n");
 		return false;
 	}
 
-	if (unlikely(xform->key.length > sizeof(fctx->auth.opad))) {
+	if (unlikely(length > sizeof(fctx->auth.opad))) {
 		NITROX_LOG(ERR, "Invalid auth key length %d\n",
-			   xform->key.length);
+			   length);
 		return false;
 	}
 
@@ -459,11 +463,10 @@  configure_auth_ctx(struct rte_crypto_auth_xform *xform,
 	if (unlikely(type == AUTH_INVALID))
 		return -ENOTSUP;
 
-	if (unlikely(!auth_key_digest_is_valid(xform, fctx)))
+	if (unlikely(!auth_key_is_valid(xform->key.data, xform->key.length,
+					fctx)))
 		return -EINVAL;
 
-	ctx->auth_op = xform->op;
-	ctx->auth_algo = xform->algo;
 	ctx->digest_length = xform->digest_length;
 
 	fctx->flags = rte_be_to_cpu_64(fctx->flags);
@@ -476,6 +479,56 @@  configure_auth_ctx(struct rte_crypto_auth_xform *xform,
 	return 0;
 }
 
+static int
+configure_aead_ctx(struct rte_crypto_aead_xform *xform,
+		   struct nitrox_crypto_ctx *ctx)
+{
+	int aes_keylen;
+	struct flexi_crypto_context *fctx = &ctx->fctx;
+
+	if (unlikely(xform->aad_length > FLEXI_CRYPTO_MAX_AAD_LEN)) {
+		NITROX_LOG(ERR, "AAD length %d not supported\n",
+			   xform->aad_length);
+		return -ENOTSUP;
+	}
+
+	if (unlikely(xform->algo != RTE_CRYPTO_AEAD_AES_GCM))
+		return -ENOTSUP;
+
+	aes_keylen = flexi_aes_keylen(xform->key.length, true);
+	if (unlikely(aes_keylen < 0))
+		return -EINVAL;
+
+	if (unlikely(!auth_key_is_valid(xform->key.data, xform->key.length,
+					fctx)))
+		return -EINVAL;
+
+	if (unlikely(xform->iv.length > MAX_IV_LEN))
+		return -EINVAL;
+
+	fctx->flags = rte_be_to_cpu_64(fctx->flags);
+	fctx->w0.cipher_type = CIPHER_AES_GCM;
+	fctx->w0.aes_keylen = aes_keylen;
+	fctx->w0.iv_source = IV_FROM_DPTR;
+	fctx->w0.hash_type = AUTH_NULL;
+	fctx->w0.auth_input_type = 1;
+	fctx->w0.mac_len = xform->digest_length;
+	fctx->flags = rte_cpu_to_be_64(fctx->flags);
+	memset(fctx->crypto.key, 0, sizeof(fctx->crypto.key));
+	memcpy(fctx->crypto.key, xform->key.data, xform->key.length);
+	memset(&fctx->auth, 0, sizeof(fctx->auth));
+	memcpy(fctx->auth.opad, xform->key.data, xform->key.length);
+
+	ctx->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
+	ctx->req_op = (xform->op == RTE_CRYPTO_AEAD_OP_ENCRYPT) ?
+			NITROX_OP_ENCRYPT : NITROX_OP_DECRYPT;
+	ctx->iv.offset = xform->iv.offset;
+	ctx->iv.length = xform->iv.length;
+	ctx->digest_length = xform->digest_length;
+	ctx->aad_length = xform->aad_length;
+	return 0;
+}
+
 static int
 nitrox_sym_dev_sess_configure(struct rte_cryptodev *cdev,
 			      struct rte_crypto_sym_xform *xform,
@@ -486,6 +539,8 @@  nitrox_sym_dev_sess_configure(struct rte_cryptodev *cdev,
 	struct nitrox_crypto_ctx *ctx;
 	struct rte_crypto_cipher_xform *cipher_xform = NULL;
 	struct rte_crypto_auth_xform *auth_xform = NULL;
+	struct rte_crypto_aead_xform *aead_xform = NULL;
+	int ret = -EINVAL;
 
 	if (rte_mempool_get(mempool, &mp_obj)) {
 		NITROX_LOG(ERR, "Couldn't allocate context\n");
@@ -503,8 +558,12 @@  nitrox_sym_dev_sess_configure(struct rte_cryptodev *cdev,
 		auth_xform = &xform->auth;
 		cipher_xform = &xform->next->cipher;
 		break;
+	case NITROX_CHAIN_COMBINED:
+		aead_xform = &xform->aead;
+		break;
 	default:
 		NITROX_LOG(ERR, "Crypto chain not supported\n");
+		ret = -ENOTSUP;
 		goto err;
 	}
 
@@ -518,12 +577,17 @@  nitrox_sym_dev_sess_configure(struct rte_cryptodev *cdev,
 		goto err;
 	}
 
+	if (aead_xform && unlikely(configure_aead_ctx(aead_xform, ctx))) {
+		NITROX_LOG(ERR, "Failed to configure aead ctx\n");
+		goto err;
+	}
+
 	ctx->iova = rte_mempool_virt2iova(ctx);
 	set_sym_session_private_data(sess, cdev->driver_id, ctx);
 	return 0;
 err:
 	rte_mempool_put(mempool, mp_obj);
-	return -EINVAL;
+	return ret;
 }
 
 static void
diff --git a/drivers/crypto/nitrox/nitrox_sym_capabilities.c b/drivers/crypto/nitrox/nitrox_sym_capabilities.c
index dc4df9185..a30cd9f8f 100644
--- a/drivers/crypto/nitrox/nitrox_sym_capabilities.c
+++ b/drivers/crypto/nitrox/nitrox_sym_capabilities.c
@@ -108,6 +108,36 @@  static const struct rte_cryptodev_capabilities nitrox_capabilities[] = {
 			}, }
 		}, }
 	},
+	{	/* AES GCM */
+		.op = RTE_CRYPTO_OP_TYPE_SYMMETRIC,
+		{.sym = {
+			.xform_type = RTE_CRYPTO_SYM_XFORM_AEAD,
+			{.aead = {
+				.algo = RTE_CRYPTO_AEAD_AES_GCM,
+				.block_size = 16,
+				.key_size = {
+					.min = 16,
+					.max = 32,
+					.increment = 8
+				},
+				.digest_size = {
+					.min = 1,
+					.max = 16,
+					.increment = 1
+				},
+				.aad_size = {
+					.min = 0,
+					.max = 512,
+					.increment = 1
+				},
+				.iv_size = {
+					.min = 12,
+					.max = 16,
+					.increment = 4
+				},
+			}, }
+		}, }
+	},
 	RTE_CRYPTODEV_END_OF_CAPABILITIES_LIST()
 };
 
diff --git a/drivers/crypto/nitrox/nitrox_sym_ctx.h b/drivers/crypto/nitrox/nitrox_sym_ctx.h
index 2985e519f..deb00fc1e 100644
--- a/drivers/crypto/nitrox/nitrox_sym_ctx.h
+++ b/drivers/crypto/nitrox/nitrox_sym_ctx.h
@@ -11,6 +11,7 @@ 
 
 #define AES_MAX_KEY_SIZE 32
 #define AES_BLOCK_SIZE 16
+#define AES_GCM_SALT_SIZE 4
 
 enum nitrox_chain {
 	NITROX_CHAIN_CIPHER_ONLY,
@@ -69,14 +70,14 @@  struct flexi_crypto_context {
 struct nitrox_crypto_ctx {
 	struct flexi_crypto_context fctx;
 	enum nitrox_chain nitrox_chain;
-	enum rte_crypto_auth_operation auth_op;
-	enum rte_crypto_auth_algorithm auth_algo;
 	struct {
 		uint16_t offset;
 		uint16_t length;
 	} iv;
 	rte_iova_t iova;
+	uint8_t salt[AES_GCM_SALT_SIZE];
 	uint16_t digest_length;
+	uint16_t aad_length;
 	uint8_t opcode;
 	uint8_t req_op;
 };
diff --git a/drivers/crypto/nitrox/nitrox_sym_reqmgr.c b/drivers/crypto/nitrox/nitrox_sym_reqmgr.c
index d9b426776..93d59b048 100644
--- a/drivers/crypto/nitrox/nitrox_sym_reqmgr.c
+++ b/drivers/crypto/nitrox/nitrox_sym_reqmgr.c
@@ -238,12 +238,13 @@  create_se_instr(struct nitrox_softreq *sr, uint8_t qno)
 }
 
 static void
-softreq_copy_iv(struct nitrox_softreq *sr)
+softreq_copy_iv(struct nitrox_softreq *sr, uint8_t salt_size)
 {
-	sr->iv.virt = rte_crypto_op_ctod_offset(sr->op, uint8_t *,
-						sr->ctx->iv.offset);
-	sr->iv.iova = rte_crypto_op_ctophys_offset(sr->op, sr->ctx->iv.offset);
-	sr->iv.len = sr->ctx->iv.length;
+	uint16_t offset = sr->ctx->iv.offset + salt_size;
+
+	sr->iv.virt = rte_crypto_op_ctod_offset(sr->op, uint8_t *, offset);
+	sr->iv.iova = rte_crypto_op_ctophys_offset(sr->op, offset);
+	sr->iv.len = sr->ctx->iv.length - salt_size;
 }
 
 static int
@@ -254,7 +255,7 @@  extract_cipher_auth_digest(struct nitrox_softreq *sr,
 	struct rte_mbuf *mdst = op->sym->m_dst ? op->sym->m_dst :
 					op->sym->m_src;
 
-	if (sr->ctx->auth_op == RTE_CRYPTO_AUTH_OP_VERIFY &&
+	if (sr->ctx->req_op == NITROX_OP_DECRYPT &&
 	    unlikely(!op->sym->auth.digest.data))
 		return -EINVAL;
 
@@ -352,6 +353,13 @@  create_cipher_auth_sglist(struct nitrox_softreq *sr,
 	if (unlikely(auth_only_len < 0))
 		return -EINVAL;
 
+	if (unlikely(
+		op->sym->cipher.data.offset + op->sym->cipher.data.length !=
+		op->sym->auth.data.offset + op->sym->auth.data.length)) {
+		NITROX_LOG(ERR, "Auth only data after cipher data not supported\n");
+		return -ENOTSUP;
+	}
+
 	err = create_sglist_from_mbuf(sgtbl, mbuf, op->sym->auth.data.offset,
 				      auth_only_len);
 	if (unlikely(err))
@@ -365,6 +373,41 @@  create_cipher_auth_sglist(struct nitrox_softreq *sr,
 	return 0;
 }
 
+static int
+create_combined_sglist(struct nitrox_softreq *sr, struct nitrox_sgtable *sgtbl,
+		       struct rte_mbuf *mbuf)
+{
+	struct rte_crypto_op *op = sr->op;
+
+	fill_sglist(sgtbl, sr->iv.len, sr->iv.iova, sr->iv.virt);
+	fill_sglist(sgtbl, sr->ctx->aad_length, op->sym->aead.aad.phys_addr,
+		    op->sym->aead.aad.data);
+	return create_sglist_from_mbuf(sgtbl, mbuf, op->sym->cipher.data.offset,
+				       op->sym->cipher.data.length);
+}
+
+static int
+create_aead_sglist(struct nitrox_softreq *sr, struct nitrox_sgtable *sgtbl,
+		   struct rte_mbuf *mbuf)
+{
+	int err;
+
+	switch (sr->ctx->nitrox_chain) {
+	case NITROX_CHAIN_CIPHER_AUTH:
+	case NITROX_CHAIN_AUTH_CIPHER:
+		err = create_cipher_auth_sglist(sr, sgtbl, mbuf);
+		break;
+	case NITROX_CHAIN_COMBINED:
+		err = create_combined_sglist(sr, sgtbl, mbuf);
+		break;
+	default:
+		err = -EINVAL;
+		break;
+	}
+
+	return err;
+}
+
 static void
 create_sgcomp(struct nitrox_sgtable *sgtbl)
 {
@@ -383,17 +426,16 @@  create_sgcomp(struct nitrox_sgtable *sgtbl)
 }
 
 static int
-create_cipher_auth_inbuf(struct nitrox_softreq *sr,
-			 struct nitrox_sglist *digest)
+create_aead_inbuf(struct nitrox_softreq *sr, struct nitrox_sglist *digest)
 {
 	int err;
 	struct nitrox_crypto_ctx *ctx = sr->ctx;
 
-	err = create_cipher_auth_sglist(sr, &sr->in, sr->op->sym->m_src);
+	err = create_aead_sglist(sr, &sr->in, sr->op->sym->m_src);
 	if (unlikely(err))
 		return err;
 
-	if (ctx->auth_op == RTE_CRYPTO_AUTH_OP_VERIFY)
+	if (ctx->req_op == NITROX_OP_DECRYPT)
 		fill_sglist(&sr->in, digest->len, digest->iova, digest->virt);
 
 	create_sgcomp(&sr->in);
@@ -402,25 +444,24 @@  create_cipher_auth_inbuf(struct nitrox_softreq *sr,
 }
 
 static int
-create_cipher_auth_oop_outbuf(struct nitrox_softreq *sr,
-			      struct nitrox_sglist *digest)
+create_aead_oop_outbuf(struct nitrox_softreq *sr, struct nitrox_sglist *digest)
 {
 	int err;
 	struct nitrox_crypto_ctx *ctx = sr->ctx;
 
-	err = create_cipher_auth_sglist(sr, &sr->out, sr->op->sym->m_dst);
+	err = create_aead_sglist(sr, &sr->out, sr->op->sym->m_dst);
 	if (unlikely(err))
 		return err;
 
-	if (ctx->auth_op == RTE_CRYPTO_AUTH_OP_GENERATE)
+	if (ctx->req_op == NITROX_OP_ENCRYPT)
 		fill_sglist(&sr->out, digest->len, digest->iova, digest->virt);
 
 	return 0;
 }
 
 static void
-create_cipher_auth_inplace_outbuf(struct nitrox_softreq *sr,
-				  struct nitrox_sglist *digest)
+create_aead_inplace_outbuf(struct nitrox_softreq *sr,
+			   struct nitrox_sglist *digest)
 {
 	int i, cnt;
 	struct nitrox_crypto_ctx *ctx = sr->ctx;
@@ -433,17 +474,16 @@  create_cipher_auth_inplace_outbuf(struct nitrox_softreq *sr,
 	}
 
 	sr->out.map_bufs_cnt = cnt;
-	if (ctx->auth_op == RTE_CRYPTO_AUTH_OP_GENERATE) {
+	if (ctx->req_op == NITROX_OP_ENCRYPT) {
 		fill_sglist(&sr->out, digest->len, digest->iova,
 			    digest->virt);
-	} else if (ctx->auth_op == RTE_CRYPTO_AUTH_OP_VERIFY) {
+	} else if (ctx->req_op == NITROX_OP_DECRYPT) {
 		sr->out.map_bufs_cnt--;
 	}
 }
 
 static int
-create_cipher_auth_outbuf(struct nitrox_softreq *sr,
-			  struct nitrox_sglist *digest)
+create_aead_outbuf(struct nitrox_softreq *sr, struct nitrox_sglist *digest)
 {
 	struct rte_crypto_op *op = sr->op;
 	int cnt = 0;
@@ -458,11 +498,11 @@  create_cipher_auth_outbuf(struct nitrox_softreq *sr,
 	if (op->sym->m_dst) {
 		int err;
 
-		err = create_cipher_auth_oop_outbuf(sr, digest);
+		err = create_aead_oop_outbuf(sr, digest);
 		if (unlikely(err))
 			return err;
 	} else {
-		create_cipher_auth_inplace_outbuf(sr, digest);
+		create_aead_inplace_outbuf(sr, digest);
 	}
 
 	cnt = sr->out.map_bufs_cnt;
@@ -516,16 +556,16 @@  process_cipher_auth_data(struct nitrox_softreq *sr)
 	int err;
 	struct nitrox_sglist digest;
 
-	softreq_copy_iv(sr);
+	softreq_copy_iv(sr, 0);
 	err = extract_cipher_auth_digest(sr, &digest);
 	if (unlikely(err))
 		return err;
 
-	err = create_cipher_auth_inbuf(sr, &digest);
+	err = create_aead_inbuf(sr, &digest);
 	if (unlikely(err))
 		return err;
 
-	err = create_cipher_auth_outbuf(sr, &digest);
+	err = create_aead_outbuf(sr, &digest);
 	if (unlikely(err))
 		return err;
 
@@ -534,6 +574,86 @@  process_cipher_auth_data(struct nitrox_softreq *sr)
 	return 0;
 }
 
+static int
+softreq_copy_salt(struct nitrox_softreq *sr)
+{
+	struct nitrox_crypto_ctx *ctx = sr->ctx;
+	uint8_t *addr;
+
+	if (unlikely(ctx->iv.length < AES_GCM_SALT_SIZE)) {
+		NITROX_LOG(ERR, "Invalid IV length %d\n", ctx->iv.length);
+		return -EINVAL;
+	}
+
+	addr = rte_crypto_op_ctod_offset(sr->op, uint8_t *, ctx->iv.offset);
+	if (!memcmp(ctx->salt, addr, AES_GCM_SALT_SIZE))
+		return 0;
+
+	memcpy(ctx->salt, addr, AES_GCM_SALT_SIZE);
+	memcpy(ctx->fctx.crypto.iv, addr, AES_GCM_SALT_SIZE);
+	return 0;
+}
+
+static int
+extract_combined_digest(struct nitrox_softreq *sr, struct nitrox_sglist *digest)
+{
+	struct rte_crypto_op *op = sr->op;
+	struct rte_mbuf *mdst = op->sym->m_dst ? op->sym->m_dst :
+		op->sym->m_src;
+
+	digest->len = sr->ctx->digest_length;
+	if (op->sym->aead.digest.data) {
+		digest->iova = op->sym->aead.digest.phys_addr;
+		digest->virt = op->sym->aead.digest.data;
+
+		return 0;
+	}
+
+	if (unlikely(rte_pktmbuf_data_len(mdst) < op->sym->aead.data.offset +
+	       op->sym->aead.data.length + digest->len))
+		return -EINVAL;
+
+	digest->iova = rte_pktmbuf_mtophys_offset(mdst,
+					op->sym->aead.data.offset +
+					op->sym->aead.data.length);
+	digest->virt = rte_pktmbuf_mtod_offset(mdst, uint8_t *,
+					op->sym->aead.data.offset +
+					op->sym->aead.data.length);
+
+	return 0;
+}
+
+static int
+process_combined_data(struct nitrox_softreq *sr)
+{
+	int err;
+	struct nitrox_sglist digest;
+	struct rte_crypto_op *op = sr->op;
+
+	err = softreq_copy_salt(sr);
+	if (unlikely(err))
+		return err;
+
+	softreq_copy_iv(sr, AES_GCM_SALT_SIZE);
+	err = extract_combined_digest(sr, &digest);
+	if (unlikely(err))
+		return err;
+
+	err = create_aead_inbuf(sr, &digest);
+	if (unlikely(err))
+		return err;
+
+	err = create_aead_outbuf(sr, &digest);
+	if (unlikely(err))
+		return err;
+
+	create_aead_gph(op->sym->aead.data.length, sr->iv.len,
+			op->sym->aead.data.length + sr->ctx->aad_length,
+			&sr->gph);
+
+	return 0;
+}
+
 static int
 process_softreq(struct nitrox_softreq *sr)
 {
@@ -545,6 +665,9 @@  process_softreq(struct nitrox_softreq *sr)
 	case NITROX_CHAIN_AUTH_CIPHER:
 		err = process_cipher_auth_data(sr);
 		break;
+	case NITROX_CHAIN_COMBINED:
+		err = process_combined_data(sr);
+		break;
 	default:
 		err = -EINVAL;
 		break;
@@ -558,10 +681,15 @@  nitrox_process_se_req(uint16_t qno, struct rte_crypto_op *op,
 		      struct nitrox_crypto_ctx *ctx,
 		      struct nitrox_softreq *sr)
 {
+	int err;
+
 	softreq_init(sr, sr->iova);
 	sr->ctx = ctx;
 	sr->op = op;
-	process_softreq(sr);
+	err = process_softreq(sr);
+	if (unlikely(err))
+		return err;
+
 	create_se_instr(sr, qno);
 	sr->timeout = rte_get_timer_cycles() + CMD_TIMEOUT * rte_get_timer_hz();
 	return 0;
@@ -577,7 +705,7 @@  nitrox_check_se_req(struct nitrox_softreq *sr, struct rte_crypto_op **op)
 	cc = *(volatile uint64_t *)(&sr->resp.completion);
 	orh = *(volatile uint64_t *)(&sr->resp.orh);
 	if (cc != PENDING_SIG)
-		err = 0;
+		err = orh & 0xff;
 	else if ((orh != PENDING_SIG) && (orh & 0xff))
 		err = orh & 0xff;
 	else if (rte_get_timer_cycles() >= sr->timeout)