| Message ID | 20230418065327.72281-12-xuanzhuo@linux.alibaba.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | virtio_net: refactor xdp codes | expand |
| Context | Check | Description |
|---|---|---|
| netdev/series_format | success | Posting correctly formatted |
| netdev/tree_selection | success | Clearly marked for net-next |
| netdev/fixes_present | success | Fixes tag not required for -next series |
| netdev/header_inline | success | No static functions without inline keyword in header files |
| netdev/build_32bit | success | Errors and warnings before: 18 this patch: 18 |
| netdev/cc_maintainers | success | CCed 13 of 13 maintainers |
| netdev/build_clang | success | Errors and warnings before: 18 this patch: 18 |
| netdev/verify_signedoff | success | Signed-off-by tag matches author and committer |
| netdev/deprecated_api | success | None detected |
| netdev/check_selftest | success | No net selftest shell script |
| netdev/verify_fixes | success | No Fixes tag |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 18 this patch: 18 |
| netdev/checkpatch | warning | WARNING: line length of 81 exceeds 80 columns |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/source_inline | success | Was 0 now: 0 |
On Tue, Apr 18, 2023 at 2:53 PM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > The purpose of this patch is to simplify the receive_small(). > Separate all the logic of XDP of small into a function. > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > --- > drivers/net/virtio_net.c | 165 +++++++++++++++++++++++---------------- > 1 file changed, 99 insertions(+), 66 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index a4bb25f39f12..34220f5f27d1 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -941,6 +941,98 @@ static struct page *xdp_linearize_page(struct receive_queue *rq, > return NULL; > } > > +static struct sk_buff *receive_small_xdp(struct net_device *dev, > + struct virtnet_info *vi, > + struct receive_queue *rq, > + struct bpf_prog *xdp_prog, > + void *buf, > + unsigned int xdp_headroom, > + unsigned int len, > + unsigned int *xdp_xmit, > + struct virtnet_rq_stats *stats) > +{ > + unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; > + unsigned int headroom = vi->hdr_len + header_offset; > + struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; > + struct page *page = virt_to_head_page(buf); > + struct page *xdp_page; > + unsigned int buflen; > + struct xdp_buff xdp; > + struct sk_buff *skb; > + unsigned int delta = 0; > + unsigned int metasize = 0; > + void *orig_data; > + u32 act; > + > + if (unlikely(hdr->hdr.gso_type)) > + goto err_xdp; > + > + buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + > + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); > + > + if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { > + int offset = buf - page_address(page) + header_offset; > + unsigned int tlen = len + vi->hdr_len; > + int num_buf = 1; > + > + xdp_headroom = virtnet_get_headroom(vi); > + header_offset = VIRTNET_RX_PAD + xdp_headroom; > + headroom = vi->hdr_len + header_offset; > + buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + > + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); > + xdp_page = xdp_linearize_page(rq, &num_buf, page, > + offset, header_offset, > + &tlen); > + if (!xdp_page) > + goto err_xdp; > + > + buf = page_address(xdp_page); > + put_page(page); > + page = xdp_page; > + } > + > + xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); > + xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, > + xdp_headroom, len, true); > + orig_data = xdp.data; > + > + act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); > + > + switch (act) { > + case VIRTNET_XDP_RES_PASS: > + /* Recalculate length in case bpf program changed it */ > + delta = orig_data - xdp.data; > + len = xdp.data_end - xdp.data; > + metasize = xdp.data - xdp.data_meta; > + break; > + > + case VIRTNET_XDP_RES_CONSUMED: > + goto xdp_xmit; > + > + case VIRTNET_XDP_RES_DROP: > + goto err_xdp; > + } > + > + skb = build_skb(buf, buflen); > + if (!skb) > + goto err; > + > + skb_reserve(skb, headroom - delta); > + skb_put(skb, len); > + if (metasize) > + skb_metadata_set(skb, metasize); > + > + return skb; > + > +err_xdp: > + stats->xdp_drops++; > +err: > + stats->drops++; > + put_page(page); > +xdp_xmit: > + return NULL; > +} > + > static struct sk_buff *receive_small(struct net_device *dev, > struct virtnet_info *vi, > struct receive_queue *rq, > @@ -957,9 +1049,6 @@ static struct sk_buff *receive_small(struct net_device *dev, > unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + > SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); > struct page *page = virt_to_head_page(buf); > - unsigned int delta = 0; > - struct page *xdp_page; > - unsigned int metasize = 0; > > len -= vi->hdr_len; > stats->bytes += len; > @@ -979,57 +1068,10 @@ static struct sk_buff *receive_small(struct net_device *dev, > rcu_read_lock(); > xdp_prog = rcu_dereference(rq->xdp_prog); > if (xdp_prog) { > - struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; > - struct xdp_buff xdp; > - void *orig_data; > - u32 act; > - > - if (unlikely(hdr->hdr.gso_type)) > - goto err_xdp; > - > - if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { > - int offset = buf - page_address(page) + header_offset; > - unsigned int tlen = len + vi->hdr_len; > - int num_buf = 1; > - > - xdp_headroom = virtnet_get_headroom(vi); > - header_offset = VIRTNET_RX_PAD + xdp_headroom; > - headroom = vi->hdr_len + header_offset; > - buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + > - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); > - xdp_page = xdp_linearize_page(rq, &num_buf, page, > - offset, header_offset, > - &tlen); > - if (!xdp_page) > - goto err_xdp; > - > - buf = page_address(xdp_page); > - put_page(page); > - page = xdp_page; > - } > - > - xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); > - xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, > - xdp_headroom, len, true); > - orig_data = xdp.data; > - > - act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); > - > - switch (act) { > - case VIRTNET_XDP_RES_PASS: > - /* Recalculate length in case bpf program changed it */ > - delta = orig_data - xdp.data; > - len = xdp.data_end - xdp.data; > - metasize = xdp.data - xdp.data_meta; > - break; > - > - case VIRTNET_XDP_RES_CONSUMED: > - rcu_read_unlock(); > - goto xdp_xmit; > - > - case VIRTNET_XDP_RES_DROP: > - goto err_xdp; > - } > + skb = receive_small_xdp(dev, vi, rq, xdp_prog, buf, xdp_headroom, > + len, xdp_xmit, stats); > + rcu_read_unlock(); > + return skb; > } > rcu_read_unlock(); > > @@ -1037,25 +1079,16 @@ static struct sk_buff *receive_small(struct net_device *dev, > skb = build_skb(buf, buflen); > if (!skb) > goto err; > - skb_reserve(skb, headroom - delta); > + skb_reserve(skb, headroom); > skb_put(skb, len); > - if (!xdp_prog) { > - buf += header_offset; > - memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); > - } /* keep zeroed vnet hdr since XDP is loaded */ > - > - if (metasize) > - skb_metadata_set(skb, metasize); > > + buf += header_offset; > + memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); So we end up with some code duplication between receive_small() and receive_small_xdp() on building skbs. Is this intended? For mergeable, we're probably fine since XDP_PASS doesn't need to get_buf(). But for the path of small, I wonder if it's better to keep the original code for building skb. Thanks > return skb; > > -err_xdp: > - rcu_read_unlock(); > - stats->xdp_drops++; > err: > stats->drops++; > put_page(page); > -xdp_xmit: > return NULL; > } > > -- > 2.32.0.3.g01195cf9f >
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index a4bb25f39f12..34220f5f27d1 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -941,6 +941,98 @@ static struct page *xdp_linearize_page(struct receive_queue *rq, return NULL; } +static struct sk_buff *receive_small_xdp(struct net_device *dev, + struct virtnet_info *vi, + struct receive_queue *rq, + struct bpf_prog *xdp_prog, + void *buf, + unsigned int xdp_headroom, + unsigned int len, + unsigned int *xdp_xmit, + struct virtnet_rq_stats *stats) +{ + unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; + unsigned int headroom = vi->hdr_len + header_offset; + struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; + struct page *page = virt_to_head_page(buf); + struct page *xdp_page; + unsigned int buflen; + struct xdp_buff xdp; + struct sk_buff *skb; + unsigned int delta = 0; + unsigned int metasize = 0; + void *orig_data; + u32 act; + + if (unlikely(hdr->hdr.gso_type)) + goto err_xdp; + + buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + + if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { + int offset = buf - page_address(page) + header_offset; + unsigned int tlen = len + vi->hdr_len; + int num_buf = 1; + + xdp_headroom = virtnet_get_headroom(vi); + header_offset = VIRTNET_RX_PAD + xdp_headroom; + headroom = vi->hdr_len + header_offset; + buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + xdp_page = xdp_linearize_page(rq, &num_buf, page, + offset, header_offset, + &tlen); + if (!xdp_page) + goto err_xdp; + + buf = page_address(xdp_page); + put_page(page); + page = xdp_page; + } + + xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); + xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, + xdp_headroom, len, true); + orig_data = xdp.data; + + act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); + + switch (act) { + case VIRTNET_XDP_RES_PASS: + /* Recalculate length in case bpf program changed it */ + delta = orig_data - xdp.data; + len = xdp.data_end - xdp.data; + metasize = xdp.data - xdp.data_meta; + break; + + case VIRTNET_XDP_RES_CONSUMED: + goto xdp_xmit; + + case VIRTNET_XDP_RES_DROP: + goto err_xdp; + } + + skb = build_skb(buf, buflen); + if (!skb) + goto err; + + skb_reserve(skb, headroom - delta); + skb_put(skb, len); + if (metasize) + skb_metadata_set(skb, metasize); + + return skb; + +err_xdp: + stats->xdp_drops++; +err: + stats->drops++; + put_page(page); +xdp_xmit: + return NULL; +} + static struct sk_buff *receive_small(struct net_device *dev, struct virtnet_info *vi, struct receive_queue *rq, @@ -957,9 +1049,6 @@ static struct sk_buff *receive_small(struct net_device *dev, unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); struct page *page = virt_to_head_page(buf); - unsigned int delta = 0; - struct page *xdp_page; - unsigned int metasize = 0; len -= vi->hdr_len; stats->bytes += len; @@ -979,57 +1068,10 @@ static struct sk_buff *receive_small(struct net_device *dev, rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); if (xdp_prog) { - struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; - struct xdp_buff xdp; - void *orig_data; - u32 act; - - if (unlikely(hdr->hdr.gso_type)) - goto err_xdp; - - if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { - int offset = buf - page_address(page) + header_offset; - unsigned int tlen = len + vi->hdr_len; - int num_buf = 1; - - xdp_headroom = virtnet_get_headroom(vi); - header_offset = VIRTNET_RX_PAD + xdp_headroom; - headroom = vi->hdr_len + header_offset; - buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); - xdp_page = xdp_linearize_page(rq, &num_buf, page, - offset, header_offset, - &tlen); - if (!xdp_page) - goto err_xdp; - - buf = page_address(xdp_page); - put_page(page); - page = xdp_page; - } - - xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); - xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, - xdp_headroom, len, true); - orig_data = xdp.data; - - act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); - - switch (act) { - case VIRTNET_XDP_RES_PASS: - /* Recalculate length in case bpf program changed it */ - delta = orig_data - xdp.data; - len = xdp.data_end - xdp.data; - metasize = xdp.data - xdp.data_meta; - break; - - case VIRTNET_XDP_RES_CONSUMED: - rcu_read_unlock(); - goto xdp_xmit; - - case VIRTNET_XDP_RES_DROP: - goto err_xdp; - } + skb = receive_small_xdp(dev, vi, rq, xdp_prog, buf, xdp_headroom, + len, xdp_xmit, stats); + rcu_read_unlock(); + return skb; } rcu_read_unlock(); @@ -1037,25 +1079,16 @@ static struct sk_buff *receive_small(struct net_device *dev, skb = build_skb(buf, buflen); if (!skb) goto err; - skb_reserve(skb, headroom - delta); + skb_reserve(skb, headroom); skb_put(skb, len); - if (!xdp_prog) { - buf += header_offset; - memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); - } /* keep zeroed vnet hdr since XDP is loaded */ - - if (metasize) - skb_metadata_set(skb, metasize); + buf += header_offset; + memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); return skb; -err_xdp: - rcu_read_unlock(); - stats->xdp_drops++; err: stats->drops++; put_page(page); -xdp_xmit: return NULL; }
The purpose of this patch is to simplify the receive_small(). Separate all the logic of XDP of small into a function. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/net/virtio_net.c | 165 +++++++++++++++++++++++---------------- 1 file changed, 99 insertions(+), 66 deletions(-)