Minimize the copies for vnet and Virtio bridge

[palacios.git] / palacios / src / devices / lnx_virtio_nic.c

diff --git a/palacios/src/devices/lnx_virtio_nic.c b/palacios/src/devices/lnx_virtio_nic.c
index 84e8f0d..7bcd9bb 100644 (file)
--- a/palacios/src/devices/lnx_virtio_nic.c
+++ b/palacios/src/devices/lnx_virtio_nic.c
@@ -37,10 +37,6 @@
 #define PrintDebug(fmt, args...)
 #endif
 
-#ifdef CONFIG_VNET_PROFILE
-#define VIRTIO_NIC_PROFILE
-#endif
-
 #define VIRTIO_NET_S_LINK_UP   1       /* Link is up */
 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
 
@@ -208,14 +204,8 @@ static int handle_pkt_tx(struct guest_info *core, struct virtio_net_state * virt
     struct virtio_queue * q = &(virtio_state->tx_vq);
     struct virtio_net_hdr * hdr = NULL;
 
-    if (q->avail->index < q->last_avail_idx) {
-       q->idx_overflow = true;
-    }
 
-    q->last_avail_idx = q->avail->index;
-
-    while (q->cur_avail_idx < q->avail->index || 
-          (q->idx_overflow && q->cur_avail_idx < (q->avail->index + 65536))) {
+    while (q->cur_avail_idx != q->avail->index) {
        struct vring_desc * hdr_desc = NULL;
        addr_t hdr_addr = 0;
        uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
@@ -248,13 +238,7 @@ static int handle_pkt_tx(struct guest_info *core, struct virtio_net_state * virt
        q->used->ring[q->used->index % q->queue_size].length = req_len; // What do we set this to????
        q->used->index++;
 
-       int last_idx = q->cur_avail_idx;
-
        q->cur_avail_idx ++;
-
-       if (q->cur_avail_idx < last_idx) {
-           q->idx_overflow = false;
-       }
     }
 
     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
@@ -262,18 +246,6 @@ static int handle_pkt_tx(struct guest_info *core, struct virtio_net_state * virt
        virtio_state->virtio_cfg.pci_isr = 0x1;
     }
 
-#ifdef VIRTIO_NIC_PROFILE
-    if(virtio_state->pkt_sent % 10000 == 0)
-       PrintError("Virtio NIC: %p, pkt_sent: %ld\n", virtio_state, virtio_state->pkt_sent);
-#endif 
-
-#ifdef CONFIG_VNET_PROFILE
-    uint64_t time;
-    rdtscll(time);
-    core->vnet_times.total_handle_time = time - core->vnet_times.virtio_handle_start;
-    core->vnet_times.print = true;
-#endif
-
     return 0;
 }
 
@@ -324,11 +296,6 @@ static int virtio_io_write(struct guest_info *core, uint16_t port, void * src, u
     struct virtio_net_state * virtio = (struct virtio_net_state *)private_data;
     int port_idx = port % virtio->io_range_size;
 
-#ifdef CONFIG_VNET_PROFILE
-    uint64_t time;
-    rdtscll(time);
-    core->vnet_times.virtio_handle_start = time;
-#endif
 
     PrintDebug("VIRTIO NIC %p Write for port %d (index=%d) len=%d, value=%x\n", private_data,
               port, port_idx,  length, *(uint32_t *)src);
@@ -511,7 +478,7 @@ static int virtio_rx(uint8_t * buf, uint32_t size, void * private_data) {
     uint32_t data_len = size;
     uint32_t offset = 0;
     unsigned long flags;
-    int ret_val;
+    int ret_val = -1;
     int raw = 1;
 
     flags = v3_lock_irqsave(virtio->lock);
@@ -528,15 +495,10 @@ static int virtio_rx(uint8_t * buf, uint32_t size, void * private_data) {
 
     if (q->ring_avail_addr == 0) {
        PrintError("Queue is not set\n");
-       ret_val = -1;
        goto exit;
     }
 
-    if (q->last_avail_idx > q->avail->index)
-       q->idx_overflow = true;
-    q->last_avail_idx = q->avail->index;
-
-    if (q->cur_avail_idx < q->avail->index || (q->idx_overflow && q->cur_avail_idx < q->avail->index+65536)){
+    if (q->cur_avail_idx != q->avail->index){
        addr_t hdr_addr = 0;
        uint16_t hdr_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
        uint16_t buf_idx = 0;
@@ -570,17 +532,9 @@ static int virtio_rx(uint8_t * buf, uint32_t size, void * private_data) {
        q->used->ring[q->used->index % q->queue_size].length = data_len + hdr_len; // This should be the total length of data sent to guest (header+pkt_data)
        q->used->index++;
 
-       int last_idx = q->cur_avail_idx;
        q->cur_avail_idx++;
-       if (q->cur_avail_idx < last_idx)
-           q->idx_overflow = false;
     } else {
        virtio->pkt_drop++;
-
-#ifdef VIRTIO_NIC_PROFILE
-       PrintError("Virtio NIC: %p, one pkt dropped receieved: %ld, dropped: %ld, sent: %ld curidx: %d, avaiIdx: %d\n", 
-               virtio, virtio->pkt_recv, virtio->pkt_drop, virtio->pkt_sent, q->cur_avail_idx, q->avail->index);
-#endif
     }
 
     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
@@ -589,13 +543,6 @@ static int virtio_rx(uint8_t * buf, uint32_t size, void * private_data) {
        virtio->virtio_cfg.pci_isr = 0x1;
     }
 
-#ifdef VIRTIO_NIC_PROFILE
-    if ((virtio->pkt_recv % 10000) == 0){
-       PrintError("Virtio NIC: %p, receieved: %ld, dropped: %ld, sent: %ld\n", 
-               virtio, virtio->pkt_recv, virtio->pkt_drop, virtio->pkt_sent);
-    }
-#endif
-
     ret_val = offset;
 
 exit: