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be9a16ccca
This introduces a new corked flag, MSG_SENDPAGE_NOTLAST, which is involved in syscall sendfile() [1], it indicates this is not the last page. So we can cork the data until the page is not specify this flag. It has the same effect as MSG_MORE, but existed in sendfile() only. This patch adds a option MSG_SENDPAGE_NOTLAST for corking data, try to cork more data before sending when using sendfile(), which acts like TCP's behaviour. Also, this reimplements the default sendpage to inform that it is supported to some extent. [1] https://man7.org/linux/man-pages/man2/sendfile.2.html Signed-off-by: Tony Lu <tonylu@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Manage send buffer
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#ifndef SMC_TX_H
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#define SMC_TX_H
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#include <linux/socket.h>
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#include <linux/types.h>
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#include "smc.h"
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#include "smc_cdc.h"
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static inline int smc_tx_prepared_sends(struct smc_connection *conn)
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{
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union smc_host_cursor sent, prep;
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smc_curs_copy(&sent, &conn->tx_curs_sent, conn);
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smc_curs_copy(&prep, &conn->tx_curs_prep, conn);
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return smc_curs_diff(conn->sndbuf_desc->len, &sent, &prep);
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}
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void smc_tx_pending(struct smc_connection *conn);
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void smc_tx_work(struct work_struct *work);
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void smc_tx_init(struct smc_sock *smc);
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int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len);
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int smc_tx_sendpage(struct smc_sock *smc, struct page *page, int offset,
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size_t size, int flags);
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int smc_tx_sndbuf_nonempty(struct smc_connection *conn);
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void smc_tx_sndbuf_nonfull(struct smc_sock *smc);
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void smc_tx_consumer_update(struct smc_connection *conn, bool force);
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int smcd_tx_ism_write(struct smc_connection *conn, void *data, size_t len,
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u32 offset, int signal);
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#endif /* SMC_TX_H */
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