From: Rusty Russell Date: Wed, 20 Mar 2013 05:14:28 +0000 (+1030) Subject: virtio_net: use virtqueue_add_sgs[] for command buffers. X-Git-Tag: firefly_0821_release~3680^2~600^2~35 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f7bc9594513d8f5a6e88e1486d48687ce5831834;p=firefly-linux-kernel-4.4.55.git virtio_net: use virtqueue_add_sgs[] for command buffers. It's a bit cleaner to hand multiple sgs, rather than one big one. Cc: "Michael S. Tsirkin" Tested-by: Wanlong Gao Signed-off-by: Rusty Russell --- diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 57ac4b0294bc..be704876af8a 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -39,7 +39,6 @@ module_param(gso, bool, 0444); #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) #define GOOD_COPY_LEN 128 -#define VIRTNET_SEND_COMMAND_SG_MAX 2 #define VIRTNET_DRIVER_VERSION "1.0.0" struct virtnet_stats { @@ -767,32 +766,35 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) * never fail unless improperly formated. */ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, - struct scatterlist *data, int out, int in) + struct scatterlist *out, + struct scatterlist *in) { - struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; + struct scatterlist *sgs[4], hdr, stat; struct virtio_net_ctrl_hdr ctrl; virtio_net_ctrl_ack status = ~0; - unsigned int tmp; - int i; + unsigned out_num = 0, in_num = 0, tmp; /* Caller should know better */ - BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || - (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); - - out++; /* Add header */ - in++; /* Add return status */ + BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); ctrl.class = class; ctrl.cmd = cmd; + /* Add header */ + sg_init_one(&hdr, &ctrl, sizeof(ctrl)); + sgs[out_num++] = &hdr; - sg_init_table(sg, out + in); + if (out) + sgs[out_num++] = out; + if (in) + sgs[out_num + in_num++] = in; - sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); - for_each_sg(data, s, out + in - 2, i) - sg_set_buf(&sg[i + 1], sg_virt(s), s->length); - sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); + /* Add return status. */ + sg_init_one(&stat, &status, sizeof(status)); + sgs[out_num + in_num++] = &stat; - BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); + BUG_ON(out_num + in_num > ARRAY_SIZE(sgs)); + BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC) + < 0); virtqueue_kick(vi->cvq); @@ -821,7 +823,7 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p) sg_init_one(&sg, addr->sa_data, dev->addr_len); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, VIRTIO_NET_CTRL_MAC_ADDR_SET, - &sg, 1, 0)) { + &sg, NULL)) { dev_warn(&vdev->dev, "Failed to set mac address by vq command.\n"); return -EINVAL; @@ -889,8 +891,7 @@ static void virtnet_ack_link_announce(struct virtnet_info *vi) { rtnl_lock(); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, - VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, - 0, 0)) + VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, NULL)) dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); rtnl_unlock(); } @@ -908,7 +909,7 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) sg_init_one(&sg, &s, sizeof(s)); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, - VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){ + VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, NULL)) { dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", queue_pairs); return -EINVAL; @@ -955,7 +956,7 @@ static void virtnet_set_rx_mode(struct net_device *dev) if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, VIRTIO_NET_CTRL_RX_PROMISC, - sg, 1, 0)) + sg, NULL)) dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", promisc ? "en" : "dis"); @@ -963,7 +964,7 @@ static void virtnet_set_rx_mode(struct net_device *dev) if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, VIRTIO_NET_CTRL_RX_ALLMULTI, - sg, 1, 0)) + sg, NULL)) dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", allmulti ? "en" : "dis"); @@ -1000,7 +1001,7 @@ static void virtnet_set_rx_mode(struct net_device *dev) if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, VIRTIO_NET_CTRL_MAC_TABLE_SET, - sg, 2, 0)) + sg, NULL)) dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); kfree(buf); @@ -1014,7 +1015,7 @@ static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) sg_init_one(&sg, &vid, sizeof(vid)); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, - VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) + VIRTIO_NET_CTRL_VLAN_ADD, &sg, NULL)) dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); return 0; } @@ -1027,7 +1028,7 @@ static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) sg_init_one(&sg, &vid, sizeof(vid)); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, - VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) + VIRTIO_NET_CTRL_VLAN_DEL, &sg, NULL)) dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); return 0; }