Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * linux/net/sunrpc/socklib.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Common socket helper routines for RPC client and server
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/sunrpc/msg_prot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/sunrpc/xdr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "socklib.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * Helper structure for copying from an sk_buff.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) struct xdr_skb_reader {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct sk_buff	*skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	unsigned int	offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	size_t		count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	__wsum		csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 				     size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * xdr_skb_read_bits - copy some data bits from skb to internal buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * @desc: sk_buff copy helper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * @to: copy destination
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * @len: number of bytes to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * Possibly called several times to iterate over an sk_buff and copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * data out of it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static size_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (len > desc->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		len = desc->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (unlikely(skb_copy_bits(desc->skb, desc->offset, to, len)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	desc->count -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	desc->offset += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  * xdr_skb_read_and_csum_bits - copy and checksum from skb to buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * @desc: sk_buff copy helper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * @to: copy destination
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * @len: number of bytes to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * Same as skb_read_bits, but calculate a checksum at the same time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static size_t xdr_skb_read_and_csum_bits(struct xdr_skb_reader *desc, void *to, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	unsigned int pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	__wsum csum2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (len > desc->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		len = desc->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	pos = desc->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	csum2 = skb_copy_and_csum_bits(desc->skb, pos, to, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	desc->csum = csum_block_add(desc->csum, csum2, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	desc->count -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	desc->offset += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * xdr_partial_copy_from_skb - copy data out of an skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * @xdr: target XDR buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  * @base: starting offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  * @desc: sk_buff copy helper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  * @copy_actor: virtual method for copying data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base, struct xdr_skb_reader *desc, xdr_skb_read_actor copy_actor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	struct page	**ppage = xdr->pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	unsigned int	len, pglen = xdr->page_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	ssize_t		copied = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	size_t		ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	len = xdr->head[0].iov_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (base < len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		len -= base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		ret = copy_actor(desc, (char *)xdr->head[0].iov_base + base, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		copied += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		if (ret != len || !desc->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		base -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (unlikely(pglen == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		goto copy_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (unlikely(base >= pglen)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		base -= pglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		goto copy_tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (base || xdr->page_base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		pglen -= base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		base += xdr->page_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		ppage += base >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		base &= ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		char *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		/* ACL likes to be lazy in allocating pages - ACLs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		 * are small by default but can get huge. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		if ((xdr->flags & XDRBUF_SPARSE_PAGES) && *ppage == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			*ppage = alloc_page(GFP_NOWAIT | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			if (unlikely(*ppage == NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 				if (copied == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 					copied = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		len = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		kaddr = kmap_atomic(*ppage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		if (base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			len -= base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			if (pglen < len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				len = pglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			ret = copy_actor(desc, kaddr + base, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			if (pglen < len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 				len = pglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			ret = copy_actor(desc, kaddr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		flush_dcache_page(*ppage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		kunmap_atomic(kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		copied += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (ret != len || !desc->count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		ppage++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	} while ((pglen -= len) != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) copy_tail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	len = xdr->tail[0].iov_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (base < len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		copied += copy_actor(desc, (char *)xdr->tail[0].iov_base + base, len - base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	return copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  * csum_partial_copy_to_xdr - checksum and copy data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  * @xdr: target XDR buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  * @skb: source skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  * We have set things up such that we perform the checksum of the UDP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)  * packet in parallel with the copies into the RPC client iovec.  -DaveM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct xdr_skb_reader	desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	desc.skb = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	desc.offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	desc.count = skb->len - desc.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (skb_csum_unnecessary(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		goto no_checksum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	desc.csum = csum_partial(skb->data, desc.offset, skb->csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_and_csum_bits) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (desc.offset != skb->len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		__wsum csum2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		csum2 = skb_checksum(skb, desc.offset, skb->len - desc.offset, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		desc.csum = csum_block_add(desc.csum, csum2, desc.offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (desc.count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (csum_fold(desc.csum))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	    !skb->csum_complete_sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		netdev_rx_csum_fault(skb->dev, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) no_checksum:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (desc.count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) EXPORT_SYMBOL_GPL(csum_partial_copy_to_xdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static inline int xprt_sendmsg(struct socket *sock, struct msghdr *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			       size_t seek)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (seek)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		iov_iter_advance(&msg->msg_iter, seek);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return sock_sendmsg(sock, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int xprt_send_kvec(struct socket *sock, struct msghdr *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			  struct kvec *vec, size_t seek)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	return xprt_sendmsg(sock, msg, seek);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static int xprt_send_pagedata(struct socket *sock, struct msghdr *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			      struct xdr_buf *xdr, size_t base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	err = xdr_alloc_bvec(xdr, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec, xdr_buf_pagecount(xdr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		      xdr->page_len + xdr->page_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	return xprt_sendmsg(sock, msg, base + xdr->page_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /* Common case:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  *  - stream transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  *  - sending from byte 0 of the message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  *  - the message is wholly contained in @xdr's head iovec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static int xprt_send_rm_and_kvec(struct socket *sock, struct msghdr *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 				 rpc_fraghdr marker, struct kvec *vec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 				 size_t base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct kvec iov[2] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		[0] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			.iov_base	= &marker,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			.iov_len	= sizeof(marker)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		[1] = *vec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	size_t len = iov[0].iov_len + iov[1].iov_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	return xprt_sendmsg(sock, msg, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)  * xprt_sock_sendmsg - write an xdr_buf directly to a socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)  * @sock: open socket to send on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)  * @msg: socket message metadata
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)  * @xdr: xdr_buf containing this request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)  * @base: starting position in the buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)  * @marker: stream record marker field
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)  * @sent_p: return the total number of bytes successfully queued for sending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)  * Return values:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)  *   On success, returns zero and fills in @sent_p.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)  *   %-ENOTSOCK if  @sock is not a struct socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) int xprt_sock_sendmsg(struct socket *sock, struct msghdr *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		      struct xdr_buf *xdr, unsigned int base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		      rpc_fraghdr marker, unsigned int *sent_p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	unsigned int rmsize = marker ? sizeof(marker) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	unsigned int remainder = rmsize + xdr->len - base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	unsigned int want;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	*sent_p = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (unlikely(!sock))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		return -ENOTSOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	msg->msg_flags |= MSG_MORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	want = xdr->head[0].iov_len + rmsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (base < want) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		unsigned int len = want - base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		remainder -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		if (remainder == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			msg->msg_flags &= ~MSG_MORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		if (rmsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			err = xprt_send_rm_and_kvec(sock, msg, marker,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 						    &xdr->head[0], base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			err = xprt_send_kvec(sock, msg, &xdr->head[0], base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		if (remainder == 0 || err != len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		*sent_p += err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		base -= want;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (base < xdr->page_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		unsigned int len = xdr->page_len - base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		remainder -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		if (remainder == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			msg->msg_flags &= ~MSG_MORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		err = xprt_send_pagedata(sock, msg, xdr, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		if (remainder == 0 || err != len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		*sent_p += err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		base -= xdr->page_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	if (base >= xdr->tail[0].iov_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	msg->msg_flags &= ~MSG_MORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	err = xprt_send_kvec(sock, msg, &xdr->tail[0], base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if (err > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		*sent_p += err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }