From patchwork Fri Oct 25 19:14:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 839075 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BE5FF223A6E; Fri, 25 Oct 2024 19:15:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729883754; cv=none; b=Ykn60LMp+dEdxi2POM1Gboj7Sdo7bHWOvNLSKGSv7RhTy4xmIQoHrJK7W1R27An2KF/iFlF1u+ddzVa6N/t4aFNptXY9qKuZTHZar3pzqxkbavfohMVnqaq2DkjYGeWTAKt+FMprpF3uOXxzVzqdbUWWyzGD+kC5MftI4pBrNwE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729883754; c=relaxed/simple; bh=1LlSnHcK+fKXrUv5i8pUWGZK8O/eLyDpKEQBxDtJZcA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TpITyf352HbJIOzysiASbpU0lrmv7wrwWvh83Wl1w55YairUJXwFUSHGw2XLh1T4QYbcaGcVn6ZzREG3jVxMrB4BKJBpYMg5Ejl2NX0hjsk816xKVv2c/LxXQr8wIuJa9Jl6KeZ5rp2ncB/43V/tZw1WFvQJrNgCrQHbmkYYY+k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PW1GfO6v; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PW1GfO6v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4C9EC4CEE6; Fri, 25 Oct 2024 19:15:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729883754; bh=1LlSnHcK+fKXrUv5i8pUWGZK8O/eLyDpKEQBxDtJZcA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PW1GfO6vzemRwg0AqRontxQV5hQ8VOLxGTZMrmvOy3nMMo7oEG5TpwygXS5X2HHA1 eLmlJXn2D5RCQPdW7iVVpwnLLVjXS/yG3FUpKGl/FbZjZ/uEzB0ILNX12dCJpg9dYV XlNZozLZbvdR32F/JDccVuGtUZa48USW/j0CxRsmZn9udAVqQn0eQrta8ByxJeVYGj ZY3g76IG6/fZlmE6ogEDreI2X8QZ7rTt0fpmTd2u/aRR9Ppmk4+FSEzjX2ja9WMjZY HupYAfcSaa0xlhlyDWJ0lBpNmlq+ks2PSLttmuglEm4OrIgng2/W9Sdk6bqPcmb7no ML3x22Vj8LQIg== From: Eric Biggers To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v2 18/18] scsi: target: iscsi: switch to using the crc32c library Date: Fri, 25 Oct 2024 12:14:54 -0700 Message-ID: <20241025191454.72616-19-ebiggers@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241025191454.72616-1-ebiggers@kernel.org> References: <20241025191454.72616-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Eric Biggers Now that the crc32c() library function directly takes advantage of architecture-specific optimizations, it is unnecessary to go through the crypto API. Just use crc32c(). This is much simpler, and it improves performance due to eliminating the crypto API overhead. Signed-off-by: Eric Biggers --- drivers/target/iscsi/Kconfig | 2 +- drivers/target/iscsi/iscsi_target.c | 153 +++++++--------------- drivers/target/iscsi/iscsi_target_login.c | 50 ------- drivers/target/iscsi/iscsi_target_login.h | 1 - drivers/target/iscsi/iscsi_target_nego.c | 21 +-- include/target/iscsi/iscsi_target_core.h | 3 - 6 files changed, 48 insertions(+), 182 deletions(-) diff --git a/drivers/target/iscsi/Kconfig b/drivers/target/iscsi/Kconfig index 1c0517a12571..2f2f3dc831b8 100644 --- a/drivers/target/iscsi/Kconfig +++ b/drivers/target/iscsi/Kconfig @@ -1,11 +1,11 @@ # SPDX-License-Identifier: GPL-2.0-only config ISCSI_TARGET tristate "SCSI Target Mode Stack" depends on INET + select CRC32 select CRYPTO - select CRYPTO_CRC32C help Say M to enable the SCSI target mode stack. A SCSI target mode stack is software that makes local storage available over a storage network to a SCSI initiator system. The supported storage network technologies include iSCSI, Fibre Channel and the SCSI RDMA Protocol (SRP). diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 6002283cbeba..091c1efccfb7 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -6,11 +6,11 @@ * * Author: Nicholas A. Bellinger * ******************************************************************************/ -#include +#include #include #include #include #include #include @@ -488,12 +488,12 @@ void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd) __iscsit_free_cmd(cmd, true); } EXPORT_SYMBOL(iscsit_aborted_task); -static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, - u32, u32, const void *, void *); +static u32 iscsit_crc_buf(const void *buf, u32 payload_length, + u32 padding, const void *pad_bytes); static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *); static int iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, const void *data_buf, u32 data_buf_len) @@ -508,13 +508,11 @@ iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, iov[niov++].iov_len = ISCSI_HDR_LEN; if (conn->conn_ops->HeaderDigest) { u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; - iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, - ISCSI_HDR_LEN, 0, NULL, - header_digest); + *header_digest = iscsit_crc_buf(hdr, ISCSI_HDR_LEN, 0, NULL); iov[0].iov_len += ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attaching CRC32C HeaderDigest" " to opcode 0x%x 0x%08x\n", @@ -535,15 +533,13 @@ iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, pr_debug("Attaching %u additional" " padding bytes.\n", padding); } if (conn->conn_ops->DataDigest) { - iscsit_do_crypto_hash_buf(conn->conn_tx_hash, - data_buf, data_buf_len, - padding, &cmd->pad_bytes, - &cmd->data_crc); - + cmd->data_crc = iscsit_crc_buf(data_buf, data_buf_len, + padding, + &cmd->pad_bytes); iov[niov].iov_base = &cmd->data_crc; iov[niov++].iov_len = ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attached DataDigest for %u" " bytes opcode 0x%x, CRC 0x%08x\n", @@ -564,12 +560,12 @@ iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, } static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec, u32 data_offset, u32 data_length); static void iscsit_unmap_iovec(struct iscsit_cmd *); -static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *, - u32, u32, u32, u8 *); +static u32 iscsit_crc_sglist(const struct iscsit_cmd *cmd, u32 data_length, + u32 padding, const u8 *pad_bytes); static int iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, const struct iscsi_datain *datain) { struct kvec *iov; @@ -582,14 +578,12 @@ iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, tx_size += ISCSI_HDR_LEN; if (conn->conn_ops->HeaderDigest) { u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; - iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, - ISCSI_HDR_LEN, 0, NULL, - header_digest); - + *header_digest = iscsit_crc_buf(cmd->pdu, ISCSI_HDR_LEN, 0, + NULL); iov[0].iov_len += ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", *header_digest); @@ -612,16 +606,12 @@ iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, pr_debug("Attaching %u padding bytes\n", cmd->padding); } if (conn->conn_ops->DataDigest) { - cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, - cmd, datain->offset, - datain->length, - cmd->padding, - cmd->pad_bytes); - + cmd->data_crc = iscsit_crc_sglist(cmd, datain->length, + cmd->padding, cmd->pad_bytes); iov[iov_count].iov_base = &cmd->data_crc; iov[iov_count++].iov_len = ISCSI_CRC_LEN; tx_size += ISCSI_CRC_LEN; pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", @@ -1402,81 +1392,49 @@ iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, return 0; return iscsit_get_immediate_data(cmd, hdr, dump_payload); } -static u32 iscsit_do_crypto_hash_sg( - struct ahash_request *hash, - struct iscsit_cmd *cmd, - u32 data_offset, - u32 data_length, - u32 padding, - u8 *pad_bytes) +static u32 iscsit_crc_sglist(const struct iscsit_cmd *cmd, u32 data_length, + u32 padding, const u8 *pad_bytes) { - u32 data_crc; - struct scatterlist *sg; - unsigned int page_off; - - crypto_ahash_init(hash); - - sg = cmd->first_data_sg; - page_off = cmd->first_data_sg_off; - - if (data_length && page_off) { - struct scatterlist first_sg; - u32 len = min_t(u32, data_length, sg->length - page_off); - - sg_init_table(&first_sg, 1); - sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off); - - ahash_request_set_crypt(hash, &first_sg, NULL, len); - crypto_ahash_update(hash); - - data_length -= len; - sg = sg_next(sg); - } + struct scatterlist *sg = cmd->first_data_sg; + unsigned int page_off = cmd->first_data_sg_off; + u32 crc = ~0; while (data_length) { - u32 cur_len = min_t(u32, data_length, sg->length); + u32 cur_len = min_t(u32, data_length, sg->length - page_off); + const void *virt; - ahash_request_set_crypt(hash, sg, NULL, cur_len); - crypto_ahash_update(hash); + virt = kmap_local_page(sg_page(sg)) + sg->offset + page_off; + crc = crc32c(crc, virt, cur_len); + kunmap_local(virt); - data_length -= cur_len; /* iscsit_map_iovec has already checked for invalid sg pointers */ sg = sg_next(sg); - } - if (padding) { - struct scatterlist pad_sg; - - sg_init_one(&pad_sg, pad_bytes, padding); - ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, - padding); - crypto_ahash_finup(hash); - } else { - ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); - crypto_ahash_final(hash); + page_off = 0; + data_length -= cur_len; } - return data_crc; + if (padding) + crc = crc32c(crc, pad_bytes, padding); + + return ~crc; } -static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, - const void *buf, u32 payload_length, u32 padding, - const void *pad_bytes, void *data_crc) +static u32 iscsit_crc_buf(const void *buf, u32 payload_length, + u32 padding, const void *pad_bytes) { - struct scatterlist sg[2]; + u32 crc = ~0; - sg_init_table(sg, ARRAY_SIZE(sg)); - sg_set_buf(sg, buf, payload_length); - if (padding) - sg_set_buf(sg + 1, pad_bytes, padding); + crc = crc32c(crc, buf, payload_length); - ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); + if (padding) + crc = crc32c(crc, pad_bytes, padding); - crypto_ahash_digest(hash); + return ~crc; } int __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf, struct iscsit_cmd *cmd, u32 payload_length, @@ -1660,15 +1618,12 @@ iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, return -1; if (conn->conn_ops->DataDigest) { u32 data_crc; - data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, - be32_to_cpu(hdr->offset), - payload_length, padding, - cmd->pad_bytes); - + data_crc = iscsit_crc_sglist(cmd, payload_length, padding, + cmd->pad_bytes); if (checksum != data_crc) { pr_err("ITT: 0x%08x, Offset: %u, Length: %u," " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" " does not match computed 0x%08x\n", hdr->itt, hdr->offset, payload_length, @@ -1923,14 +1878,12 @@ static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cm ret = -1; goto out; } if (conn->conn_ops->DataDigest) { - iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, - payload_length, padding, - cmd->pad_bytes, &data_crc); - + data_crc = iscsit_crc_buf(ping_data, payload_length, + padding, cmd->pad_bytes); if (checksum != data_crc) { pr_err("Ping data CRC32C DataDigest" " 0x%08x does not match computed 0x%08x\n", checksum, data_crc); if (!conn->sess->sess_ops->ErrorRecoveryLevel) { @@ -2326,14 +2279,11 @@ iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, rx_got = rx_data(conn, &iov[0], niov, rx_size); if (rx_got != rx_size) goto reject; if (conn->conn_ops->DataDigest) { - iscsit_do_crypto_hash_buf(conn->conn_rx_hash, - text_in, rx_size, 0, NULL, - &data_crc); - + data_crc = iscsit_crc_buf(text_in, rx_size, 0, NULL); if (checksum != data_crc) { pr_err("Text data CRC32C DataDigest" " 0x%08x does not match computed" " 0x%08x\n", checksum, data_crc); if (!conn->sess->sess_ops->ErrorRecoveryLevel) { @@ -2686,14 +2636,12 @@ static int iscsit_handle_immediate_data( } if (conn->conn_ops->DataDigest) { u32 data_crc; - data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, - cmd->write_data_done, length, padding, - cmd->pad_bytes); - + data_crc = iscsit_crc_sglist(cmd, length, padding, + cmd->pad_bytes); if (checksum != data_crc) { pr_err("ImmediateData CRC32C DataDigest 0x%08x" " does not match computed 0x%08x\n", checksum, data_crc); @@ -4114,14 +4062,12 @@ static void iscsit_get_rx_pdu(struct iscsit_conn *conn) if (ret != ISCSI_CRC_LEN) { iscsit_rx_thread_wait_for_tcp(conn); break; } - iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, - ISCSI_HDR_LEN, 0, NULL, - &checksum); - + checksum = iscsit_crc_buf(buffer, ISCSI_HDR_LEN, 0, + NULL); if (digest != checksum) { pr_err("HeaderDigest CRC32C failed," " received 0x%08x, computed 0x%08x\n", digest, checksum); /* @@ -4404,19 +4350,10 @@ int iscsit_close_connection( * If any other processes are accessing this connection pointer we * must wait until they have completed. */ iscsit_check_conn_usage_count(conn); - ahash_request_free(conn->conn_tx_hash); - if (conn->conn_rx_hash) { - struct crypto_ahash *tfm; - - tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); - ahash_request_free(conn->conn_rx_hash); - crypto_free_ahash(tfm); - } - if (conn->sock) sock_release(conn->sock); if (conn->conn_transport->iscsit_free_conn) conn->conn_transport->iscsit_free_conn(conn); diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c index 90b870f234f0..c2ac9a99ebbb 100644 --- a/drivers/target/iscsi/iscsi_target_login.c +++ b/drivers/target/iscsi/iscsi_target_login.c @@ -6,11 +6,10 @@ * * Author: Nicholas A. Bellinger * ******************************************************************************/ -#include #include #include #include #include #include @@ -69,50 +68,10 @@ static struct iscsi_login *iscsi_login_init_conn(struct iscsit_conn *conn) out_login: kfree(login); return NULL; } -/* - * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup - * per struct iscsit_conn libcrypto contexts for crc32c and crc32-intel - */ -int iscsi_login_setup_crypto(struct iscsit_conn *conn) -{ - struct crypto_ahash *tfm; - - /* - * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts - * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback - * to software 1x8 byte slicing from crc32c.ko - */ - tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); - if (IS_ERR(tfm)) { - pr_err("crypto_alloc_ahash() failed\n"); - return -ENOMEM; - } - - conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); - if (!conn->conn_rx_hash) { - pr_err("ahash_request_alloc() failed for conn_rx_hash\n"); - crypto_free_ahash(tfm); - return -ENOMEM; - } - ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL); - - conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); - if (!conn->conn_tx_hash) { - pr_err("ahash_request_alloc() failed for conn_tx_hash\n"); - ahash_request_free(conn->conn_rx_hash); - conn->conn_rx_hash = NULL; - crypto_free_ahash(tfm); - return -ENOMEM; - } - ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL); - - return 0; -} - static int iscsi_login_check_initiator_version( struct iscsit_conn *conn, u8 version_max, u8 version_min) { @@ -1163,19 +1122,10 @@ void iscsi_target_login_sess_out(struct iscsit_conn *conn, } else spin_unlock_bh(&conn->sess->conn_lock); iscsit_dec_session_usage_count(conn->sess); } - ahash_request_free(conn->conn_tx_hash); - if (conn->conn_rx_hash) { - struct crypto_ahash *tfm; - - tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); - ahash_request_free(conn->conn_rx_hash); - crypto_free_ahash(tfm); - } - if (conn->param_list) { iscsi_release_param_list(conn->param_list); conn->param_list = NULL; } iscsi_target_nego_release(conn); diff --git a/drivers/target/iscsi/iscsi_target_login.h b/drivers/target/iscsi/iscsi_target_login.h index e8760735486b..03c7d695d58f 100644 --- a/drivers/target/iscsi/iscsi_target_login.h +++ b/drivers/target/iscsi/iscsi_target_login.h @@ -7,11 +7,10 @@ struct iscsit_conn; struct iscsi_login; struct iscsi_np; struct sockaddr_storage; -extern int iscsi_login_setup_crypto(struct iscsit_conn *); extern int iscsi_check_for_session_reinstatement(struct iscsit_conn *); extern int iscsi_login_post_auth_non_zero_tsih(struct iscsit_conn *, u16, u32); extern int iscsit_setup_np(struct iscsi_np *, struct sockaddr_storage *); extern int iscsi_target_setup_login_socket(struct iscsi_np *, diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c index fa3fb5f4e6bc..16e3ded98c32 100644 --- a/drivers/target/iscsi/iscsi_target_nego.c +++ b/drivers/target/iscsi/iscsi_target_nego.c @@ -1192,18 +1192,11 @@ int iscsi_target_locate_portal( if (!sessiontype) { if (!login->leading_connection) goto get_target; sess->sess_ops->SessionType = 1; - /* - * Setup crc32c modules from libcrypto - */ - if (iscsi_login_setup_crypto(conn) < 0) { - pr_err("iscsi_login_setup_crypto() failed\n"); - ret = -1; - goto out; - } + /* * Serialize access across the discovery struct iscsi_portal_group to * process login attempt. */ conn->tpg = iscsit_global->discovery_tpg; @@ -1256,21 +1249,11 @@ int iscsi_target_locate_portal( ret = -1; goto out; } conn->tpg_np = tpg_np; pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); - /* - * Setup crc32c modules from libcrypto - */ - if (iscsi_login_setup_crypto(conn) < 0) { - pr_err("iscsi_login_setup_crypto() failed\n"); - kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); - iscsit_put_tiqn_for_login(tiqn); - conn->tpg = NULL; - ret = -1; - goto out; - } + /* * Serialize access across the struct iscsi_portal_group to * process login attempt. */ if (iscsit_access_np(np, conn->tpg) < 0) { diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h index 60af7c63b34e..51ca80abacf7 100644 --- a/include/target/iscsi/iscsi_target_core.h +++ b/include/target/iscsi/iscsi_target_core.h @@ -574,13 +574,10 @@ struct iscsit_conn { spinlock_t nopin_timer_lock; spinlock_t response_queue_lock; spinlock_t state_lock; spinlock_t login_timer_lock; spinlock_t login_worker_lock; - /* libcrypto RX and TX contexts for crc32c */ - struct ahash_request *conn_rx_hash; - struct ahash_request *conn_tx_hash; /* Used for scheduling TX and RX connection kthreads */ cpumask_var_t conn_cpumask; cpumask_var_t allowed_cpumask; unsigned int conn_rx_reset_cpumask:1; unsigned int conn_tx_reset_cpumask:1;