net: pktgen: fix pkt_size
The commit879c7220e8
("net: pktgen: Observe needed_headroom of the device") increased the 'pkt_overhead' field value by LL_RESERVED_SPACE. As a side effect the generated packet size, computed as: /* Eth + IPh + UDPh + mpls */ datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 - pkt_dev->pkt_overhead; is decreased by the same value. The above changed slightly the behavior of existing pktgen users, and made the procfs interface somewhat inconsistent. Fix it by restoring the previous pkt_overhead value and using LL_RESERVED_SPACE as extralen in skb allocation. Also, change pktgen_alloc_skb() to only partially reserve the headroom to allow the caller to prefetch from ll header start. v1 -> v2: - fixed some typos in the comments Fixes:879c7220e8
("net: pktgen: Observe needed_headroom of the device") Suggested-by: Ben Greear <greearb@candelatech.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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b82d44d784
Коммит
63d75463c9
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@ -2286,7 +2286,7 @@ out:
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static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
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{
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pkt_dev->pkt_overhead = LL_RESERVED_SPACE(pkt_dev->odev);
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pkt_dev->pkt_overhead = 0;
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pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
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pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
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pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
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@ -2777,13 +2777,13 @@ static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
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}
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static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
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struct pktgen_dev *pkt_dev,
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unsigned int extralen)
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struct pktgen_dev *pkt_dev)
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{
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unsigned int extralen = LL_RESERVED_SPACE(dev);
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struct sk_buff *skb = NULL;
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unsigned int size = pkt_dev->cur_pkt_size + 64 + extralen +
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pkt_dev->pkt_overhead;
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unsigned int size;
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size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead;
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if (pkt_dev->flags & F_NODE) {
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int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
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@ -2796,8 +2796,9 @@ static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
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skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
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}
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/* the caller pre-fetches from skb->data and reserves for the mac hdr */
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if (likely(skb))
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skb_reserve(skb, LL_RESERVED_SPACE(dev));
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skb_reserve(skb, extralen - 16);
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return skb;
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}
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@ -2830,16 +2831,14 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
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mod_cur_headers(pkt_dev);
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queue_map = pkt_dev->cur_queue_map;
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datalen = (odev->hard_header_len + 16) & ~0xf;
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skb = pktgen_alloc_skb(odev, pkt_dev, datalen);
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skb = pktgen_alloc_skb(odev, pkt_dev);
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if (!skb) {
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sprintf(pkt_dev->result, "No memory");
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return NULL;
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}
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prefetchw(skb->data);
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skb_reserve(skb, datalen);
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skb_reserve(skb, 16);
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/* Reserve for ethernet and IP header */
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eth = (__u8 *) skb_push(skb, 14);
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@ -2959,7 +2958,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
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mod_cur_headers(pkt_dev);
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queue_map = pkt_dev->cur_queue_map;
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skb = pktgen_alloc_skb(odev, pkt_dev, 16);
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skb = pktgen_alloc_skb(odev, pkt_dev);
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if (!skb) {
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sprintf(pkt_dev->result, "No memory");
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return NULL;
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