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authorScott Feldman <sfeldma@cumulusnetworks.com>2013-03-18 11:43:44 -0700
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-25 11:14:07 +0100
commitd32fcad366e5f45d33dab2ee4de0e5729439680b (patch)
tree6881ca1e804644a6361a76813318bcf1a36c7d99 /net
parent786fd2b0f87baded8c9e55307b99719eea3e016e (diff)
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net: increase buffer size to accommodate Jumbo frame pkts
Socket buffer sizes were hard-coded to 4K for VDE and socket netdevs. Bump this up to 68K (ala tap netdev) to handle maximum GSO packet size (64k) plus plenty of room for the ethernet and virtio_net headers. Originally, ran into this limitation when using -netdev UDP sockets to connect VM-to-VM, where VM interface is configure with MTU=9000. (Using virtio_net NIC model). Test is simple: ping -M do -s 8500 <target>. This test will attempt to ping with unfragmented packet of given size. Without patch, size is limited to < 4K (minus protocol hdrs). With patch, ping test works with pkt size up to 9000 (again, minus protocol hdrs). v2: per Stefan, increase buf size to (4096+65536) as done in tap and apply to vde and socket netdevs. v1: increase buf size to 12K just for -netdev UDP sockets Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/net.c2
-rw-r--r--net/socket.c4
-rw-r--r--net/tap.c7
-rw-r--r--net/vde.c2
4 files changed, 5 insertions, 10 deletions
diff --git a/net/net.c b/net/net.c
index f3d67f8..7869161 100644
--- a/net/net.c
+++ b/net/net.c
@@ -497,7 +497,7 @@ ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
int iovcnt)
{
- uint8_t buffer[4096];
+ uint8_t buffer[NET_BUFSIZE];
size_t offset;
offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
diff --git a/net/socket.c b/net/socket.c
index b0c83e0..6c3752b 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -40,7 +40,7 @@ typedef struct NetSocketState {
unsigned int index;
unsigned int packet_len;
unsigned int send_index; /* number of bytes sent (only SOCK_STREAM) */
- uint8_t buf[4096];
+ uint8_t buf[NET_BUFSIZE];
struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
IOHandler *send_fn; /* differs between SOCK_STREAM/SOCK_DGRAM */
bool read_poll; /* waiting to receive data? */
@@ -146,7 +146,7 @@ static void net_socket_send(void *opaque)
NetSocketState *s = opaque;
int size, err;
unsigned l;
- uint8_t buf1[4096];
+ uint8_t buf1[NET_BUFSIZE];
const uint8_t *buf;
size = qemu_recv(s->fd, buf1, sizeof(buf1), 0);
diff --git a/net/tap.c b/net/tap.c
index ce79699..e7c8481 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -44,17 +44,12 @@
#include "hw/vhost_net.h"
-/* Maximum GSO packet size (64k) plus plenty of room for
- * the ethernet and virtio_net headers
- */
-#define TAP_BUFSIZE (4096 + 65536)
-
typedef struct TAPState {
NetClientState nc;
int fd;
char down_script[1024];
char down_script_arg[128];
- uint8_t buf[TAP_BUFSIZE];
+ uint8_t buf[NET_BUFSIZE];
bool read_poll;
bool write_poll;
bool using_vnet_hdr;
diff --git a/net/vde.c b/net/vde.c
index 4dea32d..2a619fb 100644
--- a/net/vde.c
+++ b/net/vde.c
@@ -39,7 +39,7 @@ typedef struct VDEState {
static void vde_to_qemu(void *opaque)
{
VDEState *s = opaque;
- uint8_t buf[4096];
+ uint8_t buf[NET_BUFSIZE];
int size;
size = vde_recv(s->vde, (char *)buf, sizeof(buf), 0);