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Date: Tue, 07 Feb 2017 08:06:32 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: Tariq Toukan <ttoukan.linux@...il.com>
Cc: Eric Dumazet <edumazet@...gle.com>,
"David S . Miller" <davem@...emloft.net>,
netdev <netdev@...r.kernel.org>,
Tariq Toukan <tariqt@...lanox.com>,
Martin KaFai Lau <kafai@...com>,
Willem de Bruijn <willemb@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Brenden Blanco <bblanco@...mgrid.com>,
Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH net-next 0/9] mlx4: order-0 allocations and page
recycling
On Tue, 2017-02-07 at 17:50 +0200, Tariq Toukan wrote:
> Hi Eric,
>
> Thanks for your series.
>
> On 07/02/2017 5:02 AM, Eric Dumazet wrote:
> > As mentioned half a year ago, we better switch mlx4 driver to order-0
> > allocations and page recycling.
> >
> > This reduces vulnerability surface thanks to better skb->truesize tracking
> > and provides better performance in most cases.
> The series makes significant change in the RX data-path, that requires
> deeper checks, in addition to code review.
> We applied your series and started running both our functional and
> performance regression.
> We will have results by tomorrow morning, and will analyze them during
> the day. I'll update about that.
Thanks Tariq.
I have also removed the need to access rx_desc, one less cache line
miss. Added two prefetches as well.
I will incorporate the following in the series.
30 -> 32 Gbits on a single TCP flow.
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 6854a19087edbf0bc9bf29e20a82deaaf043..3959db42b3d15657d4073a0d6391afd6a2a5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -483,7 +483,9 @@ static noinline int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
truesize += frag_info->frag_stride;
if (frag_info->frag_stride == PAGE_SIZE / 2) {
frags[nr].page_offset ^= PAGE_SIZE / 2;
- release = page_count(page) != 1 || page_is_pfmemalloc(page);
+ release = page_count(page) != 1 ||
+ page_is_pfmemalloc(page) ||
+ page_to_nid(page) != numa_mem_id();
} else {
frags[nr].page_offset += frag_info->frag_stride;
release = frags[nr].page_offset + frag_info->frag_size > PAGE_SIZE;
@@ -514,12 +516,11 @@ static noinline int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
- struct mlx4_en_rx_desc *rx_desc,
struct mlx4_en_rx_alloc *frags,
+ void *va,
unsigned int length)
{
struct sk_buff *skb;
- void *va;
int used_frags;
dma_addr_t dma;
@@ -531,10 +532,6 @@ static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
skb_reserve(skb, NET_IP_ALIGN);
skb->len = length;
- /* Get pointer to first fragment so we could copy the headers into the
- * (linear part of the) skb */
- va = page_address(frags[0].page) + frags[0].page_offset;
-
if (length <= SMALL_PACKET_SIZE) {
/* We are copying all relevant data to the skb - temporarily
* sync buffers for the copy */
@@ -689,7 +686,6 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
struct mlx4_cqe *cqe;
struct mlx4_en_rx_ring *ring = priv->rx_ring[cq->ring];
struct mlx4_en_rx_alloc *frags;
- struct mlx4_en_rx_desc *rx_desc;
struct bpf_prog *xdp_prog;
int doorbell_pending;
struct sk_buff *skb;
@@ -722,14 +718,18 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
/* Process all completed CQEs */
while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
cq->mcq.cons_index & cq->size)) {
+ void *va;
frags = ring->rx_info + (index << priv->log_rx_info);
- rx_desc = ring->buf + (index << ring->log_stride);
/*
* make sure we read the CQE after we read the ownership bit
*/
dma_rmb();
+ prefetch(frags[0].page);
+ va = page_address(frags[0].page) + frags[0].page_offset;
+
+ prefetch(va + 64);
/* Drop packet on bad receive or bad checksum */
if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
@@ -753,7 +753,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
/* Get pointer to first fragment since we haven't
* skb yet and cast it to ethhdr struct
*/
- dma = be64_to_cpu(rx_desc->data[0].addr);
+ dma = frags[0].dma + frags[0].page_offset;
dma_sync_single_for_cpu(priv->ddev, dma, sizeof(*ethh),
DMA_FROM_DEVICE);
ethh = (struct ethhdr *)(page_address(frags[0].page) +
@@ -792,7 +792,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
void *orig_data;
u32 act;
- dma = be64_to_cpu(rx_desc->data[0].addr);
+ dma = frags[0].dma + frags[0].page_offset;
dma_sync_single_for_cpu(priv->ddev, dma,
priv->frag_info[0].frag_size,
DMA_FROM_DEVICE);
@@ -880,7 +880,6 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
goto next;
if (ip_summed == CHECKSUM_COMPLETE) {
- void *va = skb_frag_address(skb_shinfo(gro_skb)->frags);
if (check_csum(cqe, gro_skb, va,
dev->features)) {
ip_summed = CHECKSUM_NONE;
@@ -932,7 +931,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
}
/* GRO not possible, complete processing here */
- skb = mlx4_en_rx_skb(priv, rx_desc, frags, length);
+ skb = mlx4_en_rx_skb(priv, frags, va, length);
if (unlikely(!skb)) {
ring->dropped++;
goto next;
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