Date:   Thu, 18 Apr 2019 17:43:50 -0700
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, davem@...emloft.net, ast@...nel.org,
        daniel@...earbox.net, simon.horman@...ronome.com,
        willemb@...gle.com, peterpenkov96@...il.com,
        Maxim Krasnyansky <maxk@....qualcomm.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Igor Russkikh <igor.russkikh@...antia.com>
Subject: Re: [PATCH bpf-next v5 5/6] net: pass net argument to the
 eth_get_headlen

On 04/18, Alexei Starovoitov wrote:
> On Mon, Apr 15, 2019 at 10:38:00AM -0700, Stanislav Fomichev wrote:
> > Update all users eth_get_headlen to pass network namespace
> > and pass it down to the flow dissector. This commit is a noop
> > until administrator inserts BPF flow dissector program.
> > 
> > Cc: Maxim Krasnyansky <maxk@....qualcomm.com>
> > Cc: Saeed Mahameed <saeedm@...lanox.com>
> > Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > Cc: intel-wired-lan@...ts.osuosl.org
> > Cc: Yisen Zhuang <yisen.zhuang@...wei.com>
> > Cc: Salil Mehta <salil.mehta@...wei.com>
> > Cc: Michael Chan <michael.chan@...adcom.com>
> > Cc: Igor Russkikh <igor.russkikh@...antia.com>
> > Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> > ---
> >  drivers/net/ethernet/aquantia/atlantic/aq_ring.c  | 3 ++-
> >  drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 2 +-
> >  drivers/net/ethernet/hisilicon/hns/hns_enet.c     | 3 ++-
> >  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c   | 3 ++-
> >  drivers/net/ethernet/intel/fm10k/fm10k_main.c     | 2 +-
> >  drivers/net/ethernet/intel/i40e/i40e_txrx.c       | 3 ++-
> >  drivers/net/ethernet/intel/iavf/iavf_txrx.c       | 3 ++-
> >  drivers/net/ethernet/intel/ice/ice_txrx.c         | 3 ++-
> >  drivers/net/ethernet/intel/igb/igb_main.c         | 3 ++-
> >  drivers/net/ethernet/intel/igc/igc_main.c         | 3 ++-
> >  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     | 2 +-
> >  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 3 ++-
> >  drivers/net/ethernet/mellanox/mlx5/core/en_tx.c   | 3 ++-
> >  drivers/net/tun.c                                 | 3 ++-
> >  include/linux/etherdevice.h                       | 2 +-
> >  net/ethernet/eth.c                                | 5 +++--
> >  16 files changed, 29 insertions(+), 17 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
> > index c64e2fb5a4f1..1b3181f757b7 100644
> > --- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
> > +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
> > @@ -354,7 +354,8 @@ int aq_ring_rx_clean(struct aq_ring_s *self,
> >  
> >  			hdr_len = buff->len;
> >  			if (hdr_len > AQ_CFG_RX_HDR_SIZE)
> > -				hdr_len = eth_get_headlen(aq_buf_vaddr(&buff->rxdata),
> > +				hdr_len = eth_get_headlen(dev_net(skb->dev),
> > +							  aq_buf_vaddr(&buff->rxdata),
> >  							  AQ_CFG_RX_HDR_SIZE);
> >  
> >  			memcpy(__skb_put(skb, hdr_len), aq_buf_vaddr(&buff->rxdata),
> > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > index 6528a597367b..8bb5f708ccc6 100644
> > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > @@ -899,7 +899,7 @@ static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
> >  			     DMA_ATTR_WEAK_ORDERING);
> >  
> >  	if (unlikely(!payload))
> > -		payload = eth_get_headlen(data_ptr, len);
> > +		payload = eth_get_headlen(dev_net(bp->dev), data_ptr, len);
> >  
> >  	skb = napi_alloc_skb(&rxr->bnapi->napi, payload);
> >  	if (!skb) {
> > diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> > index 297b95c1b3c1..f1ecc78d2323 100644
> > --- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> > +++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> > @@ -598,7 +598,8 @@ static int hns_nic_poll_rx_skb(struct hns_nic_ring_data *ring_data,
> >  	} else {
> >  		ring->stats.seg_pkt_cnt++;
> >  
> > -		pull_len = eth_get_headlen(va, HNS_RX_HEAD_SIZE);
> > +		pull_len = eth_get_headlen(dev_net(ndev), va,
> > +					   HNS_RX_HEAD_SIZE);
> >  		memcpy(__skb_put(skb, pull_len), va,
> >  		       ALIGN(pull_len, sizeof(long)));
> >  
> > diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > index b53b0911ec24..423d9ce0f6f8 100644
> > --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > @@ -2457,7 +2457,8 @@ static int hns3_alloc_skb(struct hns3_enet_ring *ring, int length,
> >  	ring->stats.seg_pkt_cnt++;
> >  	u64_stats_update_end(&ring->syncp);
> >  
> > -	ring->pull_len = eth_get_headlen(va, HNS3_RX_HEAD_SIZE);
> > +	ring->pull_len = eth_get_headlen(dev_net(netdev), va,
> > +					 HNS3_RX_HEAD_SIZE);
> >  	__skb_put(skb, ring->pull_len);
> >  	hns3_nic_reuse_page(skb, ring->frag_num++, ring, ring->pull_len,
> >  			    desc_cb);
> > diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
> > index 2325cee76211..e2bee187d652 100644
> > --- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
> > +++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
> > @@ -280,7 +280,7 @@ static bool fm10k_add_rx_frag(struct fm10k_rx_buffer *rx_buffer,
> >  	/* we need the header to contain the greater of either ETH_HLEN or
> >  	 * 60 bytes if the skb->len is less than 60 for skb_pad.
> >  	 */
> > -	pull_len = eth_get_headlen(va, FM10K_RX_HDR_LEN);
> > +	pull_len = eth_get_headlen(dev_net(skb->dev), va, FM10K_RX_HDR_LEN);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	memcpy(__skb_put(skb, pull_len), va, ALIGN(pull_len, sizeof(long)));
> > diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> > index 1a95223c9f99..85c5b503e0a0 100644
> > --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> > +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> > @@ -2035,7 +2035,8 @@ static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring,
> >  	/* Determine available headroom for copy */
> >  	headlen = size;
> >  	if (headlen > I40E_RX_HDR_SIZE)
> > -		headlen = eth_get_headlen(xdp->data, I40E_RX_HDR_SIZE);
> > +		headlen = eth_get_headlen(dev_net(skb->dev), xdp->data,
> > +					  I40E_RX_HDR_SIZE);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	memcpy(__skb_put(skb, headlen), xdp->data,
> > diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
> > index b64187753ad6..23a62d7d0f9f 100644
> > --- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
> > +++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
> > @@ -1315,7 +1315,8 @@ static struct sk_buff *iavf_construct_skb(struct iavf_ring *rx_ring,
> >  	/* Determine available headroom for copy */
> >  	headlen = size;
> >  	if (headlen > IAVF_RX_HDR_SIZE)
> > -		headlen = eth_get_headlen(va, IAVF_RX_HDR_SIZE);
> > +		headlen = eth_get_headlen(dev_net(skb->dev), va,
> > +					  IAVF_RX_HDR_SIZE);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
> > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
> > index a6f7b7feaf3c..2692b9333055 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_txrx.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
> > @@ -698,7 +698,8 @@ ice_construct_skb(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
> >  	/* Determine available headroom for copy */
> >  	headlen = size;
> >  	if (headlen > ICE_RX_HDR_SIZE)
> > -		headlen = eth_get_headlen(va, ICE_RX_HDR_SIZE);
> > +		headlen = eth_get_headlen(dev_net(skb->dev), va,
> > +					  ICE_RX_HDR_SIZE);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
> > diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
> > index acbb5b4f333d..2023e1800c8d 100644
> > --- a/drivers/net/ethernet/intel/igb/igb_main.c
> > +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> > @@ -8051,7 +8051,8 @@ static struct sk_buff *igb_construct_skb(struct igb_ring *rx_ring,
> >  	/* Determine available headroom for copy */
> >  	headlen = size;
> >  	if (headlen > IGB_RX_HDR_LEN)
> > -		headlen = eth_get_headlen(va, IGB_RX_HDR_LEN);
> > +		headlen = eth_get_headlen(dev_net(skb->dev), va,
> > +					  IGB_RX_HDR_LEN);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
> > diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> > index f79728381e8a..265a9d8a8421 100644
> > --- a/drivers/net/ethernet/intel/igc/igc_main.c
> > +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> > @@ -1199,7 +1199,8 @@ static struct sk_buff *igc_construct_skb(struct igc_ring *rx_ring,
> >  	/* Determine available headroom for copy */
> >  	headlen = size;
> >  	if (headlen > IGC_RX_HDR_LEN)
> > -		headlen = eth_get_headlen(va, IGC_RX_HDR_LEN);
> > +		headlen = eth_get_headlen(dev_net(skb->dev), va,
> > +					  IGC_RX_HDR_LEN);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
> > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > index 60cec3540dd7..5e5294567ca1 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > @@ -1800,7 +1800,7 @@ static void ixgbe_pull_tail(struct ixgbe_ring *rx_ring,
> >  	 * we need the header to contain the greater of either ETH_HLEN or
> >  	 * 60 bytes if the skb->len is less than 60 for skb_pad.
> >  	 */
> > -	pull_len = eth_get_headlen(va, IXGBE_RX_HDR_SIZE);
> > +	pull_len = eth_get_headlen(dev_net(skb->dev), va, IXGBE_RX_HDR_SIZE);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	skb_copy_to_linear_data(skb, va, ALIGN(pull_len, sizeof(long)));
> > diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> > index 49e23afa05a2..252fe0de6b56 100644
> > --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> > +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> > @@ -895,7 +895,8 @@ struct sk_buff *ixgbevf_construct_skb(struct ixgbevf_ring *rx_ring,
> >  	/* Determine available headroom for copy */
> >  	headlen = size;
> >  	if (headlen > IXGBEVF_RX_HDR_SIZE)
> > -		headlen = eth_get_headlen(xdp->data, IXGBEVF_RX_HDR_SIZE);
> > +		headlen = eth_get_headlen(dev_net(skb->dev), xdp->data,
> > +					  IXGBEVF_RX_HDR_SIZE);
> >  
> >  	/* align pull length to size of long to optimize memcpy performance */
> >  	memcpy(__skb_put(skb, headlen), xdp->data,
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
> > index 40f3f98aa279..efcc27756c7e 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
> > @@ -163,7 +163,8 @@ static inline u16 mlx5e_calc_min_inline(enum mlx5_inline_modes mode,
> >  	case MLX5_INLINE_MODE_NONE:
> >  		return 0;
> >  	case MLX5_INLINE_MODE_TCP_UDP:
> > -		hlen = eth_get_headlen(skb->data, skb_headlen(skb));
> > +		hlen = eth_get_headlen(dev_net(skb->dev), skb->data,
> > +				       skb_headlen(skb));
> >  		if (hlen == ETH_HLEN && !skb_vlan_tag_present(skb))
> >  			hlen += VLAN_HLEN;
> >  		break;
> > diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> > index 24d0220b9ba0..6d5c8ecfea1e 100644
> > --- a/drivers/net/tun.c
> > +++ b/drivers/net/tun.c
> > @@ -1965,7 +1965,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
> >  
> >  	if (frags) {
> >  		/* Exercise flow dissector code path. */
> > -		u32 headlen = eth_get_headlen(skb->data, skb_headlen(skb));
> > +		u32 headlen = eth_get_headlen(dev_net(tun->dev), skb->data,
> > +					      skb_headlen(skb));
> >  
> >  		if (unlikely(headlen > skb_headlen(skb))) {
> >  			this_cpu_inc(tun->pcpu_stats->rx_dropped);
> > diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
> > index e2f3b21cd72a..71a441ffab3f 100644
> > --- a/include/linux/etherdevice.h
> > +++ b/include/linux/etherdevice.h
> > @@ -33,7 +33,7 @@ struct device;
> >  int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
> >  unsigned char *arch_get_platform_mac_address(void);
> >  int nvmem_get_mac_address(struct device *dev, void *addrbuf);
> > -u32 eth_get_headlen(void *data, unsigned int max_len);
> > +u32 eth_get_headlen(const struct net *net, void *data, unsigned int max_len);
> >  __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
> >  extern const struct header_ops eth_header_ops;
> >  
> > diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
> > index 1e439549c419..0202e72e20a4 100644
> > --- a/net/ethernet/eth.c
> > +++ b/net/ethernet/eth.c
> > @@ -119,13 +119,14 @@ EXPORT_SYMBOL(eth_header);
> >  
> >  /**
> >   * eth_get_headlen - determine the length of header for an ethernet frame
> > + * @net: pointer to device network namespace
> >   * @data: pointer to start of frame
> >   * @len: total length of frame
> >   *
> >   * Make a best effort attempt to pull the length for all of the headers for
> >   * a given frame in a linear buffer.
> >   */
> > -u32 eth_get_headlen(void *data, unsigned int len)
> > +u32 eth_get_headlen(const struct net *net, void *data, unsigned int len)
> 
> would it make sense to future proof it a little bit and pass 'dev'
> into eth_get_headlen() instead of 'net' ?
> May be tomorrow we'd want different flow_dissectors per-device
> in addition to per-net ?
Good point, will use net_device.

> Also please add C based test for skb-less flow_dissector.
> Current test_flow_dissector.sh doesn't seem to cover it.
It doesn't look like we can exercise skb-less flow dissector from
test_flow_dissector.sh; we need to trigger some driver code, which is
hard when we send the packets on the localhost in
test_flow_dissector.sh.

To test skb-less dissector I convert BPF_PROG_TEST_RUN to always use skb-less
mode. test_flow_dissector.sh tests skb-mode, prog_tests/flow_dissector.c
tests skb-less mode.

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