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522 lines
13 KiB
522 lines
13 KiB
/* |
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* Copyright (c) 2006, 2020 Oracle and/or its affiliates. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#include <linux/skbuff.h> |
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#include <linux/list.h> |
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#include <linux/errqueue.h> |
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#include "rds.h" |
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static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = { |
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[RDS_EXTHDR_NONE] = 0, |
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[RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version), |
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[RDS_EXTHDR_RDMA] = sizeof(struct rds_ext_header_rdma), |
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[RDS_EXTHDR_RDMA_DEST] = sizeof(struct rds_ext_header_rdma_dest), |
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[RDS_EXTHDR_NPATHS] = sizeof(u16), |
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[RDS_EXTHDR_GEN_NUM] = sizeof(u32), |
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}; |
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void rds_message_addref(struct rds_message *rm) |
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{ |
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rdsdebug("addref rm %p ref %d\n", rm, refcount_read(&rm->m_refcount)); |
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refcount_inc(&rm->m_refcount); |
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} |
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EXPORT_SYMBOL_GPL(rds_message_addref); |
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static inline bool rds_zcookie_add(struct rds_msg_zcopy_info *info, u32 cookie) |
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{ |
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struct rds_zcopy_cookies *ck = &info->zcookies; |
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int ncookies = ck->num; |
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if (ncookies == RDS_MAX_ZCOOKIES) |
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return false; |
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ck->cookies[ncookies] = cookie; |
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ck->num = ++ncookies; |
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return true; |
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} |
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static struct rds_msg_zcopy_info *rds_info_from_znotifier(struct rds_znotifier *znotif) |
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{ |
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return container_of(znotif, struct rds_msg_zcopy_info, znotif); |
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} |
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void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *q) |
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{ |
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unsigned long flags; |
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LIST_HEAD(copy); |
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struct rds_msg_zcopy_info *info, *tmp; |
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spin_lock_irqsave(&q->lock, flags); |
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list_splice(&q->zcookie_head, ©); |
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INIT_LIST_HEAD(&q->zcookie_head); |
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spin_unlock_irqrestore(&q->lock, flags); |
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list_for_each_entry_safe(info, tmp, ©, rs_zcookie_next) { |
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list_del(&info->rs_zcookie_next); |
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kfree(info); |
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} |
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} |
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static void rds_rm_zerocopy_callback(struct rds_sock *rs, |
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struct rds_znotifier *znotif) |
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{ |
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struct rds_msg_zcopy_info *info; |
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struct rds_msg_zcopy_queue *q; |
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u32 cookie = znotif->z_cookie; |
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struct rds_zcopy_cookies *ck; |
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struct list_head *head; |
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unsigned long flags; |
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mm_unaccount_pinned_pages(&znotif->z_mmp); |
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q = &rs->rs_zcookie_queue; |
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spin_lock_irqsave(&q->lock, flags); |
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head = &q->zcookie_head; |
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if (!list_empty(head)) { |
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info = list_entry(head, struct rds_msg_zcopy_info, |
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rs_zcookie_next); |
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if (info && rds_zcookie_add(info, cookie)) { |
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spin_unlock_irqrestore(&q->lock, flags); |
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kfree(rds_info_from_znotifier(znotif)); |
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/* caller invokes rds_wake_sk_sleep() */ |
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return; |
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} |
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} |
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info = rds_info_from_znotifier(znotif); |
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ck = &info->zcookies; |
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memset(ck, 0, sizeof(*ck)); |
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WARN_ON(!rds_zcookie_add(info, cookie)); |
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list_add_tail(&q->zcookie_head, &info->rs_zcookie_next); |
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spin_unlock_irqrestore(&q->lock, flags); |
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/* caller invokes rds_wake_sk_sleep() */ |
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} |
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/* |
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* This relies on dma_map_sg() not touching sg[].page during merging. |
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*/ |
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static void rds_message_purge(struct rds_message *rm) |
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{ |
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unsigned long i, flags; |
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bool zcopy = false; |
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if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags))) |
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return; |
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spin_lock_irqsave(&rm->m_rs_lock, flags); |
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if (rm->m_rs) { |
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struct rds_sock *rs = rm->m_rs; |
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if (rm->data.op_mmp_znotifier) { |
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zcopy = true; |
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rds_rm_zerocopy_callback(rs, rm->data.op_mmp_znotifier); |
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rds_wake_sk_sleep(rs); |
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rm->data.op_mmp_znotifier = NULL; |
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} |
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sock_put(rds_rs_to_sk(rs)); |
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rm->m_rs = NULL; |
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} |
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spin_unlock_irqrestore(&rm->m_rs_lock, flags); |
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for (i = 0; i < rm->data.op_nents; i++) { |
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/* XXX will have to put_page for page refs */ |
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if (!zcopy) |
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__free_page(sg_page(&rm->data.op_sg[i])); |
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else |
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put_page(sg_page(&rm->data.op_sg[i])); |
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} |
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rm->data.op_nents = 0; |
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if (rm->rdma.op_active) |
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rds_rdma_free_op(&rm->rdma); |
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if (rm->rdma.op_rdma_mr) |
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kref_put(&rm->rdma.op_rdma_mr->r_kref, __rds_put_mr_final); |
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if (rm->atomic.op_active) |
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rds_atomic_free_op(&rm->atomic); |
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if (rm->atomic.op_rdma_mr) |
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kref_put(&rm->atomic.op_rdma_mr->r_kref, __rds_put_mr_final); |
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} |
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void rds_message_put(struct rds_message *rm) |
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{ |
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rdsdebug("put rm %p ref %d\n", rm, refcount_read(&rm->m_refcount)); |
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WARN(!refcount_read(&rm->m_refcount), "danger refcount zero on %p\n", rm); |
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if (refcount_dec_and_test(&rm->m_refcount)) { |
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BUG_ON(!list_empty(&rm->m_sock_item)); |
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BUG_ON(!list_empty(&rm->m_conn_item)); |
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rds_message_purge(rm); |
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kfree(rm); |
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} |
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} |
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EXPORT_SYMBOL_GPL(rds_message_put); |
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void rds_message_populate_header(struct rds_header *hdr, __be16 sport, |
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__be16 dport, u64 seq) |
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{ |
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hdr->h_flags = 0; |
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hdr->h_sport = sport; |
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hdr->h_dport = dport; |
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hdr->h_sequence = cpu_to_be64(seq); |
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hdr->h_exthdr[0] = RDS_EXTHDR_NONE; |
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} |
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EXPORT_SYMBOL_GPL(rds_message_populate_header); |
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int rds_message_add_extension(struct rds_header *hdr, unsigned int type, |
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const void *data, unsigned int len) |
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{ |
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unsigned int ext_len = sizeof(u8) + len; |
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unsigned char *dst; |
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/* For now, refuse to add more than one extension header */ |
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if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE) |
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return 0; |
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if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type]) |
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return 0; |
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if (ext_len >= RDS_HEADER_EXT_SPACE) |
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return 0; |
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dst = hdr->h_exthdr; |
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*dst++ = type; |
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memcpy(dst, data, len); |
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dst[len] = RDS_EXTHDR_NONE; |
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return 1; |
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} |
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EXPORT_SYMBOL_GPL(rds_message_add_extension); |
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/* |
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* If a message has extension headers, retrieve them here. |
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* Call like this: |
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* |
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* unsigned int pos = 0; |
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* |
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* while (1) { |
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* buflen = sizeof(buffer); |
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* type = rds_message_next_extension(hdr, &pos, buffer, &buflen); |
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* if (type == RDS_EXTHDR_NONE) |
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* break; |
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* ... |
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* } |
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*/ |
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int rds_message_next_extension(struct rds_header *hdr, |
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unsigned int *pos, void *buf, unsigned int *buflen) |
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{ |
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unsigned int offset, ext_type, ext_len; |
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u8 *src = hdr->h_exthdr; |
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offset = *pos; |
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if (offset >= RDS_HEADER_EXT_SPACE) |
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goto none; |
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/* Get the extension type and length. For now, the |
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* length is implied by the extension type. */ |
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ext_type = src[offset++]; |
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if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX) |
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goto none; |
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ext_len = rds_exthdr_size[ext_type]; |
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if (offset + ext_len > RDS_HEADER_EXT_SPACE) |
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goto none; |
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*pos = offset + ext_len; |
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if (ext_len < *buflen) |
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*buflen = ext_len; |
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memcpy(buf, src + offset, *buflen); |
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return ext_type; |
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none: |
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*pos = RDS_HEADER_EXT_SPACE; |
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*buflen = 0; |
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return RDS_EXTHDR_NONE; |
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} |
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int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset) |
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{ |
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struct rds_ext_header_rdma_dest ext_hdr; |
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ext_hdr.h_rdma_rkey = cpu_to_be32(r_key); |
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ext_hdr.h_rdma_offset = cpu_to_be32(offset); |
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return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr)); |
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} |
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EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension); |
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/* |
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* Each rds_message is allocated with extra space for the scatterlist entries |
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* rds ops will need. This is to minimize memory allocation count. Then, each rds op |
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* can grab SGs when initializing its part of the rds_message. |
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*/ |
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struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp) |
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{ |
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struct rds_message *rm; |
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if (extra_len > KMALLOC_MAX_SIZE - sizeof(struct rds_message)) |
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return NULL; |
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rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp); |
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if (!rm) |
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goto out; |
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rm->m_used_sgs = 0; |
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rm->m_total_sgs = extra_len / sizeof(struct scatterlist); |
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refcount_set(&rm->m_refcount, 1); |
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INIT_LIST_HEAD(&rm->m_sock_item); |
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INIT_LIST_HEAD(&rm->m_conn_item); |
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spin_lock_init(&rm->m_rs_lock); |
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init_waitqueue_head(&rm->m_flush_wait); |
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out: |
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return rm; |
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} |
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/* |
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* RDS ops use this to grab SG entries from the rm's sg pool. |
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*/ |
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struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents) |
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{ |
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struct scatterlist *sg_first = (struct scatterlist *) &rm[1]; |
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struct scatterlist *sg_ret; |
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if (nents <= 0) { |
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pr_warn("rds: alloc sgs failed! nents <= 0\n"); |
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return ERR_PTR(-EINVAL); |
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} |
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if (rm->m_used_sgs + nents > rm->m_total_sgs) { |
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pr_warn("rds: alloc sgs failed! total %d used %d nents %d\n", |
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rm->m_total_sgs, rm->m_used_sgs, nents); |
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return ERR_PTR(-ENOMEM); |
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} |
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sg_ret = &sg_first[rm->m_used_sgs]; |
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sg_init_table(sg_ret, nents); |
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rm->m_used_sgs += nents; |
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return sg_ret; |
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} |
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struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len) |
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{ |
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struct rds_message *rm; |
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unsigned int i; |
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int num_sgs = DIV_ROUND_UP(total_len, PAGE_SIZE); |
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int extra_bytes = num_sgs * sizeof(struct scatterlist); |
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rm = rds_message_alloc(extra_bytes, GFP_NOWAIT); |
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if (!rm) |
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return ERR_PTR(-ENOMEM); |
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set_bit(RDS_MSG_PAGEVEC, &rm->m_flags); |
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rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len); |
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rm->data.op_nents = DIV_ROUND_UP(total_len, PAGE_SIZE); |
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rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs); |
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if (IS_ERR(rm->data.op_sg)) { |
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void *err = ERR_CAST(rm->data.op_sg); |
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rds_message_put(rm); |
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return err; |
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} |
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for (i = 0; i < rm->data.op_nents; ++i) { |
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sg_set_page(&rm->data.op_sg[i], |
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virt_to_page(page_addrs[i]), |
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PAGE_SIZE, 0); |
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} |
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return rm; |
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} |
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static int rds_message_zcopy_from_user(struct rds_message *rm, struct iov_iter *from) |
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{ |
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struct scatterlist *sg; |
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int ret = 0; |
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int length = iov_iter_count(from); |
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int total_copied = 0; |
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struct rds_msg_zcopy_info *info; |
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rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from)); |
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/* |
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* now allocate and copy in the data payload. |
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*/ |
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sg = rm->data.op_sg; |
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info = kzalloc(sizeof(*info), GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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INIT_LIST_HEAD(&info->rs_zcookie_next); |
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rm->data.op_mmp_znotifier = &info->znotif; |
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if (mm_account_pinned_pages(&rm->data.op_mmp_znotifier->z_mmp, |
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length)) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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while (iov_iter_count(from)) { |
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struct page *pages; |
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size_t start; |
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ssize_t copied; |
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copied = iov_iter_get_pages(from, &pages, PAGE_SIZE, |
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1, &start); |
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if (copied < 0) { |
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struct mmpin *mmp; |
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int i; |
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for (i = 0; i < rm->data.op_nents; i++) |
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put_page(sg_page(&rm->data.op_sg[i])); |
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mmp = &rm->data.op_mmp_znotifier->z_mmp; |
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mm_unaccount_pinned_pages(mmp); |
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ret = -EFAULT; |
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goto err; |
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} |
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total_copied += copied; |
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iov_iter_advance(from, copied); |
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length -= copied; |
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sg_set_page(sg, pages, copied, start); |
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rm->data.op_nents++; |
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sg++; |
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} |
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WARN_ON_ONCE(length != 0); |
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return ret; |
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err: |
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kfree(info); |
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rm->data.op_mmp_znotifier = NULL; |
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return ret; |
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} |
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int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from, |
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bool zcopy) |
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{ |
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unsigned long to_copy, nbytes; |
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unsigned long sg_off; |
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struct scatterlist *sg; |
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int ret = 0; |
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rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from)); |
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/* now allocate and copy in the data payload. */ |
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sg = rm->data.op_sg; |
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sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */ |
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if (zcopy) |
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return rds_message_zcopy_from_user(rm, from); |
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while (iov_iter_count(from)) { |
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if (!sg_page(sg)) { |
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ret = rds_page_remainder_alloc(sg, iov_iter_count(from), |
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GFP_HIGHUSER); |
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if (ret) |
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return ret; |
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rm->data.op_nents++; |
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sg_off = 0; |
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} |
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to_copy = min_t(unsigned long, iov_iter_count(from), |
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sg->length - sg_off); |
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rds_stats_add(s_copy_from_user, to_copy); |
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nbytes = copy_page_from_iter(sg_page(sg), sg->offset + sg_off, |
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to_copy, from); |
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if (nbytes != to_copy) |
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return -EFAULT; |
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sg_off += to_copy; |
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if (sg_off == sg->length) |
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sg++; |
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} |
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return ret; |
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} |
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int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to) |
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{ |
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struct rds_message *rm; |
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struct scatterlist *sg; |
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unsigned long to_copy; |
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unsigned long vec_off; |
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int copied; |
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int ret; |
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u32 len; |
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rm = container_of(inc, struct rds_message, m_inc); |
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len = be32_to_cpu(rm->m_inc.i_hdr.h_len); |
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sg = rm->data.op_sg; |
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vec_off = 0; |
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copied = 0; |
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|
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while (iov_iter_count(to) && copied < len) { |
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to_copy = min_t(unsigned long, iov_iter_count(to), |
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sg->length - vec_off); |
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to_copy = min_t(unsigned long, to_copy, len - copied); |
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rds_stats_add(s_copy_to_user, to_copy); |
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ret = copy_page_to_iter(sg_page(sg), sg->offset + vec_off, |
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to_copy, to); |
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if (ret != to_copy) |
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return -EFAULT; |
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vec_off += to_copy; |
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copied += to_copy; |
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if (vec_off == sg->length) { |
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vec_off = 0; |
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sg++; |
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} |
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} |
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return copied; |
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} |
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|
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/* |
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* If the message is still on the send queue, wait until the transport |
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* is done with it. This is particularly important for RDMA operations. |
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*/ |
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void rds_message_wait(struct rds_message *rm) |
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{ |
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wait_event_interruptible(rm->m_flush_wait, |
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!test_bit(RDS_MSG_MAPPED, &rm->m_flags)); |
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} |
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void rds_message_unmapped(struct rds_message *rm) |
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{ |
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clear_bit(RDS_MSG_MAPPED, &rm->m_flags); |
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wake_up_interruptible(&rm->m_flush_wait); |
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} |
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EXPORT_SYMBOL_GPL(rds_message_unmapped);
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