[Qemu-devel] [Patch] BiteSizedTasks LargeFrames

[Siddharth Gupta <siddharthgupta04@gmail.com>]

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>From 032be62f56a207833ae12cc9474e3e8be5ed8eb4 Mon Sep 17 00:00:00 2001
From: Siddharth Gupta <siddharthgupta04@gmail.com>
Date: Fri, 11 Mar 2016 20:10:41 +0530
Subject: [PATCH] bitesizedtasks-large_frames-hw_dma_xilinx-hw_net_virtio

---
 hw/dma/xilinx_axidma.c |  5 ++++-
 hw/net/virtio-net.c    | 11 ++++++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/hw/dma/xilinx_axidma.c b/hw/dma/xilinx_axidma.c
index ce5c1e6..9c6bda2 100644
--- a/hw/dma/xilinx_axidma.c
+++ b/hw/dma/xilinx_axidma.c
@@ -255,13 +255,15 @@ static void stream_process_mem2s(struct Stream *s,
StreamSlave *tx_data_dev,
                                  StreamSlave *tx_control_dev)
 {
     uint32_t prev_d;
-    unsigned char txbuf[16 * 1024];
+    unsigned char *txbuf;
     unsigned int txlen;

     if (!stream_running(s) || stream_idle(s)) {
         return;
     }

+    txbuf = (unsigned char *) malloc(16 * 1024 * sizeof(unsigned char));
+
     while (1) {
         stream_desc_load(s, s->regs[R_CURDESC]);

@@ -303,6 +305,7 @@ static void stream_process_mem2s(struct Stream *s,
StreamSlave *tx_data_dev,
             break;
         }
     }
+    free(txbuf);
 }

 static size_t stream_process_s2mem(struct Stream *s, unsigned char *buf,
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 5798f87..ba6ebac 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1094,7 +1094,7 @@ static ssize_t virtio_net_receive(NetClientState *nc,
const uint8_t *buf, size_t
     VirtIONet *n = qemu_get_nic_opaque(nc);
     VirtIONetQueue *q = virtio_net_get_subqueue(nc);
     VirtIODevice *vdev = VIRTIO_DEVICE(n);
-    struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
+    struct iovec *mhdr_sg;
     struct virtio_net_hdr_mrg_rxbuf mhdr;
     unsigned mhdr_cnt = 0;
     size_t offset, i, guest_offset;
@@ -1113,6 +1113,8 @@ static ssize_t virtio_net_receive(NetClientState *nc,
const uint8_t *buf, size_t

     offset = i = 0;

+    mhdr_sg = (struct iovec *) malloc(VIRTQUEUE_MAX_SIZE * sizeof(struct
iovec));
+
     while (offset < size) {
         VirtQueueElement *elem;
         int len, total;
@@ -1122,6 +1124,7 @@ static ssize_t virtio_net_receive(NetClientState *nc,
const uint8_t *buf, size_t

         elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
         if (!elem) {
+            free(mhdr_sg);
             if (i == 0)
                 return -1;
             error_report("virtio-net unexpected empty queue: "
@@ -1136,11 +1139,15 @@ static ssize_t virtio_net_receive(NetClientState
*nc, const uint8_t *buf, size_t

         if (elem->in_num < 1) {
             error_report("virtio-net receive queue contains no in
buffers");
+            free(mhdr_sg);
             exit(1);
         }

         sg = elem->in_sg;
         if (i == 0) {
+            if (offset != 0) {
+                free(mhdr_sg);
+            }
             assert(offset == 0);
             if (n->mergeable_rx_bufs) {
                 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
@@ -1168,6 +1175,7 @@ static ssize_t virtio_net_receive(NetClientState *nc,
const uint8_t *buf, size_t
         if (!n->mergeable_rx_bufs && offset < size) {
             virtqueue_discard(q->rx_vq, elem, total);
             g_free(elem);
+            free(mhdr_sg);
             return size;
         }

@@ -1186,6 +1194,7 @@ static ssize_t virtio_net_receive(NetClientState *nc,
const uint8_t *buf, size_t
     virtqueue_flush(q->rx_vq, i);
     virtio_notify(vdev, q->rx_vq);

+    free(mhdr_sg);
     return size;
 }

-- 
2.5.0

Signed-off-by: Siddharth Gupta <siddharthgupta04@gmail.com>

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