* [PATCH] pktgen: proc_if_write: reduce stack usage
@ 2005-01-31 3:29 Randy.Dunlap
0 siblings, 0 replies; only message in thread
From: Randy.Dunlap @ 2005-01-31 3:29 UTC (permalink / raw)
To: netdev, davem, robert.olsson
[-- Attachment #1: Type: text/plain, Size: 373 bytes --]
Hi,
Are you interested in pktgen stack reduction?
Is this acceptable?
pktgen: proc_if_write: reduce stack usage (on i386)
from 776 to 296 bytes by combining/reusing locals.
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
diffstat:=
net/core/pktgen.c | 94
++++++++++++++++++++++++------------------------------
1 files changed, 42 insertions(+), 52 deletions(-)
[-- Attachment #2: pktgen_stack.patch --]
[-- Type: text/x-patch, Size: 8040 bytes --]
diff -Naurp ./net/core/pktgen.c~pktgen_stack ./net/core/pktgen.c
--- ./net/core/pktgen.c~pktgen_stack 2005-01-27 16:31:49.000000000 -0800
+++ ./net/core/pktgen.c 2005-01-30 19:07:55.252712936 -0800
@@ -811,6 +811,8 @@ static int proc_if_write(struct file *fi
struct pktgen_dev *pkt_dev = (struct pktgen_dev*)(data);
char* pg_result = NULL;
int tmp = 0;
+ char buf4[IP_NAME_SZ];
+ char buf6[128];
pg_result = &(pkt_dev->result[0]);
@@ -1071,16 +1073,15 @@ static int proc_if_write(struct file *fi
return count;
}
if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
- char buf[IP_NAME_SZ];
len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
if (len < 0) { return len; }
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf4, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
- if (strcmp(buf, pkt_dev->dst_min) != 0) {
+ buf4[len] = 0;
+ if (strcmp(buf4, pkt_dev->dst_min) != 0) {
memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
- strncpy(pkt_dev->dst_min, buf, len);
+ strncpy(pkt_dev->dst_min, buf4, len);
pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
pkt_dev->cur_daddr = pkt_dev->daddr_min;
}
@@ -1091,17 +1092,16 @@ static int proc_if_write(struct file *fi
return count;
}
if (!strcmp(name, "dst_max")) {
- char buf[IP_NAME_SZ];
len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
if (len < 0) { return len; }
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf4, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
- if (strcmp(buf, pkt_dev->dst_max) != 0) {
+ buf4[len] = 0;
+ if (strcmp(buf4, pkt_dev->dst_max) != 0) {
memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
- strncpy(pkt_dev->dst_max, buf, len);
+ strncpy(pkt_dev->dst_max, buf4, len);
pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
pkt_dev->cur_daddr = pkt_dev->daddr_max;
}
@@ -1112,108 +1112,99 @@ static int proc_if_write(struct file *fi
return count;
}
if (!strcmp(name, "dst6")) {
- char buf[128];
-
len = strn_len(&user_buffer[i], 128 - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf6, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
+ buf6[len] = 0;
- scan_ip6(buf, pkt_dev->in6_daddr.s6_addr);
- fmt_ip6(buf, pkt_dev->in6_daddr.s6_addr);
+ scan_ip6(buf6, pkt_dev->in6_daddr.s6_addr);
+ fmt_ip6(buf6, pkt_dev->in6_daddr.s6_addr);
ipv6_addr_copy(&pkt_dev->cur_in6_daddr, &pkt_dev->in6_daddr);
if(debug)
- printk("pktgen: dst6 set to: %s\n", buf);
+ printk("pktgen: dst6 set to: %s\n", buf6);
i += len;
- sprintf(pg_result, "OK: dst6=%s", buf);
+ sprintf(pg_result, "OK: dst6=%s", buf6);
return count;
}
if (!strcmp(name, "dst6_min")) {
- char buf[128];
-
len = strn_len(&user_buffer[i], 128 - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf6, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
+ buf6[len] = 0;
- scan_ip6(buf, pkt_dev->min_in6_daddr.s6_addr);
- fmt_ip6(buf, pkt_dev->min_in6_daddr.s6_addr);
+ scan_ip6(buf6, pkt_dev->min_in6_daddr.s6_addr);
+ fmt_ip6(buf6, pkt_dev->min_in6_daddr.s6_addr);
ipv6_addr_copy(&pkt_dev->cur_in6_daddr, &pkt_dev->min_in6_daddr);
if(debug)
- printk("pktgen: dst6_min set to: %s\n", buf);
+ printk("pktgen: dst6_min set to: %s\n", buf6);
i += len;
- sprintf(pg_result, "OK: dst6_min=%s", buf);
+ sprintf(pg_result, "OK: dst6_min=%s", buf6);
return count;
}
if (!strcmp(name, "dst6_max")) {
- char buf[128];
-
len = strn_len(&user_buffer[i], 128 - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf6, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
+ buf6[len] = 0;
- scan_ip6(buf, pkt_dev->max_in6_daddr.s6_addr);
- fmt_ip6(buf, pkt_dev->max_in6_daddr.s6_addr);
+ scan_ip6(buf6, pkt_dev->max_in6_daddr.s6_addr);
+ fmt_ip6(buf6, pkt_dev->max_in6_daddr.s6_addr);
if(debug)
- printk("pktgen: dst6_max set to: %s\n", buf);
+ printk("pktgen: dst6_max set to: %s\n", buf6);
i += len;
- sprintf(pg_result, "OK: dst6_max=%s", buf);
+ sprintf(pg_result, "OK: dst6_max=%s", buf6);
return count;
}
if (!strcmp(name, "src6")) {
- char buf[128];
-
len = strn_len(&user_buffer[i], 128 - 1);
if (len < 0) return len;
pkt_dev->flags |= F_IPV6;
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf6, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
+ buf6[len] = 0;
- scan_ip6(buf, pkt_dev->in6_saddr.s6_addr);
- fmt_ip6(buf, pkt_dev->in6_saddr.s6_addr);
+ scan_ip6(buf6, pkt_dev->in6_saddr.s6_addr);
+ fmt_ip6(buf6, pkt_dev->in6_saddr.s6_addr);
ipv6_addr_copy(&pkt_dev->cur_in6_saddr, &pkt_dev->in6_saddr);
if(debug)
- printk("pktgen: src6 set to: %s\n", buf);
+ printk("pktgen: src6 set to: %s\n", buf6);
i += len;
- sprintf(pg_result, "OK: src6=%s", buf);
+ sprintf(pg_result, "OK: src6=%s", buf6);
return count;
}
if (!strcmp(name, "src_min")) {
- char buf[IP_NAME_SZ];
len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
if (len < 0) { return len; }
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf4, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
- if (strcmp(buf, pkt_dev->src_min) != 0) {
+ buf4[len] = 0;
+ if (strcmp(buf4, pkt_dev->src_min) != 0) {
memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
- strncpy(pkt_dev->src_min, buf, len);
+ strncpy(pkt_dev->src_min, buf4, len);
pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
pkt_dev->cur_saddr = pkt_dev->saddr_min;
}
@@ -1224,15 +1215,14 @@ static int proc_if_write(struct file *fi
return count;
}
if (!strcmp(name, "src_max")) {
- char buf[IP_NAME_SZ];
len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
if (len < 0) { return len; }
- if (copy_from_user(buf, &user_buffer[i], len))
+ if (copy_from_user(buf4, &user_buffer[i], len))
return -EFAULT;
- buf[len] = 0;
- if (strcmp(buf, pkt_dev->src_max) != 0) {
+ buf4[len] = 0;
+ if (strcmp(buf4, pkt_dev->src_max) != 0) {
memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
- strncpy(pkt_dev->src_max, buf, len);
+ strncpy(pkt_dev->src_max, buf4, len);
pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
pkt_dev->cur_saddr = pkt_dev->saddr_max;
}
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2005-01-31 3:29 [PATCH] pktgen: proc_if_write: reduce stack usage Randy.Dunlap
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