From: Scott Feldman <sfel...@cumulusnetworks.com>
Socket buffer sizes were hard-coded to 4K. Bump this up to 12K to handle
typical
MTU=9000 Jumbo frame pkt. 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).
Signed-off-by: Scott Feldman <sfel...@cumulusnetworks.com>
---
net/net.c | 2 +-
net/socket.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/net/net.c b/net/net.c
index f3d67f8..bab9ced 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[12*1024];
size_t offset;
offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
diff --git a/net/socket.c b/net/socket.c
index 396dc8c..74e0057 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[12*1024];
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[12*1024];
const uint8_t *buf;
size = qemu_recv(s->fd, buf1, sizeof(buf1), 0);
--
1.7.2.5
