[virtio] Consolidate vring_get_buf() by using a buffer list to add to the vring
Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
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5dd5107976
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@ -204,52 +204,36 @@ static int vring_get_buf(int queue_index, unsigned int *len)
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return ret;
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}
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static void vring_add_buf(int queue_index, int index, int num_added)
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static void vring_add_buf(int queue_index,
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struct vring_list list[],
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unsigned int out, unsigned int in,
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int index, int num_added)
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{
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struct vring *vr = &vring[queue_index];
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int i, avail, head;
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int i, avail, head, prev;
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BUG_ON(queue_index >= QUEUE_NB);
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BUG_ON(out + in == 0);
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prev = 0;
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head = free_head[queue_index];
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i = head;
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if (queue_index == TX_INDEX) {
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BUG_ON(index != 0);
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/* add header into vring */
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for (i = head; out; i = vr->desc[i].next, out--) {
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vr->desc[i].flags = VRING_DESC_F_NEXT;
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vr->desc[i].addr = (u64)virt_to_phys(&tx_virtio_hdr);
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vr->desc[i].len = sizeof(struct virtio_net_hdr);
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i = vr->desc[i].next;
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/* add frame buffer into vring */
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vr->desc[i].flags = 0;
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vr->desc[i].addr = (u64)virt_to_phys(&tx_eth_frame);
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vr->desc[i].len = ETH_FRAME_LEN;
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i = vr->desc[i].next;
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} else if (queue_index == RX_INDEX) {
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BUG_ON(index >= RX_BUF_NB);
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/* add header into vring */
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vr->desc[i].addr = (u64)virt_to_phys(list->addr);
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vr->desc[i].len = list->length;
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prev = i;
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list++;
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}
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for ( ; in; i = vr->desc[i].next, in--) {
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vr->desc[i].flags = VRING_DESC_F_NEXT|VRING_DESC_F_WRITE;
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vr->desc[i].addr = (u64)virt_to_phys(&rx_hdr[index]);
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vr->desc[i].len = sizeof(struct virtio_net_hdr);
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i = vr->desc[i].next;
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/* add frame buffer into vring */
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vr->desc[i].flags = VRING_DESC_F_WRITE;
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vr->desc[i].addr = (u64)virt_to_phys(&rx_buffer[index]);
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vr->desc[i].len = ETH_FRAME_LEN;
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i = vr->desc[i].next;
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vr->desc[i].addr = (u64)virt_to_phys(list->addr);
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vr->desc[i].len = list->length;
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prev = i;
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list++;
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}
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vr->desc[prev].flags &= ~VRING_DESC_F_NEXT;
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free_head[queue_index] = i;
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@ -306,6 +290,7 @@ static int virtnet_poll(struct nic *nic, int retrieve)
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unsigned int len;
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u16 token;
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struct virtio_net_hdr *hdr;
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struct vring_list list[2];
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if (!vring_more_used(RX_INDEX))
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return 0;
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@ -320,12 +305,17 @@ static int virtnet_poll(struct nic *nic, int retrieve)
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hdr = &rx_hdr[token]; /* FIXME: check flags */
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len -= sizeof(struct virtio_net_hdr);
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nic->packetlen = len;
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nic->packetlen = len;
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memcpy(nic->packet, (char *)rx_buffer[token], nic->packetlen);
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/* add buffer to desc */
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vring_add_buf(RX_INDEX, token, 0);
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list[0].addr = (char*)&rx_hdr[token];
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list[0].length = sizeof(struct virtio_net_hdr);
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list[1].addr = (char*)&rx_buffer[token];
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list[1].length = ETH_FRAME_LEN;
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vring_add_buf(RX_INDEX, list, 0, 2, token, 0);
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vring_kick(nic, RX_INDEX, 1);
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return 1;
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@ -342,6 +332,8 @@ static int virtnet_poll(struct nic *nic, int retrieve)
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static void virtnet_transmit(struct nic *nic, const char *destaddr,
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unsigned int type, unsigned int len, const char *data)
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{
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struct vring_list list[2];
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/*
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* from http://www.etherboot.org/wiki/dev/devmanual :
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* "You do not need more than one transmit buffer."
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@ -365,7 +357,12 @@ static void virtnet_transmit(struct nic *nic, const char *destaddr,
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tx_eth_frame.hdr.type = htons(type);
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memcpy(tx_eth_frame.data, data, len);
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vring_add_buf(TX_INDEX, 0, 0);
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list[0].addr = (char*)&tx_virtio_hdr;
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list[0].length = sizeof(struct virtio_net_hdr);
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list[1].addr = (char*)&tx_eth_frame;
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list[1].length = ETH_FRAME_LEN;
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vring_add_buf(TX_INDEX, list, 2, 0, 0, 0);
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vring_kick(nic, TX_INDEX, 1);
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@ -405,9 +402,15 @@ static void virtnet_irq(struct nic *nic __unused, irq_action_t action)
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static void provide_buffers(struct nic *nic)
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{
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int i;
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struct vring_list list[2];
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for (i = 0; i < RX_BUF_NB; i++)
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vring_add_buf(RX_INDEX, i, i);
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for (i = 0; i < RX_BUF_NB; i++) {
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list[0].addr = (char*)&rx_hdr[i];
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list[0].length = sizeof(struct virtio_net_hdr);
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list[1].addr = (char*)&rx_buffer[i];
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list[1].length = ETH_FRAME_LEN;
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vring_add_buf(RX_INDEX, list, 0, 2, i, i);
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}
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/* nofify */
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@ -58,6 +58,11 @@ struct vring {
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struct vring_used *used;
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};
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struct vring_list {
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char *addr;
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unsigned int length;
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};
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static inline void vring_init(struct vring *vr,
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unsigned int num, unsigned char *queue)
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{
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@ -90,4 +95,5 @@ static inline void vring_init(struct vring *vr,
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(sizeof(struct vring_avail) + sizeof(u16) * num)) \
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+ PAGE_MASK) & ~PAGE_MASK) + \
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(sizeof(struct vring_used) + sizeof(struct vring_used_elem) * num))
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#endif /* _VIRTIO_RING_H_ */
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