* [PATCH v2 0/4] USB & USBNET: loose SG check and support usbnet DMA SG @ 2013-08-05 8:46 Ming Lei 2013-08-05 8:47 ` [PATCH v2 1/4] USB: introduce usb_device_no_sg_constraint() helper Ming Lei ` (3 more replies) 0 siblings, 4 replies; 9+ messages in thread From: Ming Lei @ 2013-08-05 8:46 UTC (permalink / raw) To: David S. Miller, Greg Kroah-Hartman Cc: Oliver Neukum, Sarah Sharp, netdev, linux-usb Hi, This patchset allows drivers to pass sg buffers which size can't be divided by max packet size of endpoint if the host controllers(such ax xHCI) support this kind of sg buffers. Previously we added check[1] on the situation and don't allow these sg buffers passed to USB HCD, looks the check is too strict to make use of new feature of new hardware(xHCI) for some applications(such as network stack) which can't provide this kind of sg buffers to usbnet driver, so the patch looses the check in case that the host controller supports it. Patch 3/4 implements DMA SG on usbnet driver, and patch 4/4 uses it on ax88179_178a USB3 NIC for supporting TSO, so both CPU utilization and tx throughput can be improved with TSO and DMA SG in case of the USB NIC is attached to xHCI controller. This patchset depends on both net-next and usb-next tree, so hope David and Greg to figure out one elegent way to merge it. [1], http://git.kernel.org/cgit/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=10e232c597ac757e7f8600649f7e872e86de190f V2: - add missed kfree(urb->sg) in 3/4 - rename no_sg_limit as no_sg_constraint as suggested by Alan V1: - introduce and apply usb_device_no_sg_limit() helper as suggested by Greg - simplify patch 4/4 against Eric Dumazet's patch(ax88179_178a: avoid copy of tx tcp packets) - don't pass usbnet header as sg buffer drivers/net/usb/ax88179_178a.c | 12 ++++++++++++ drivers/net/usb/usbnet.c | 39 +++++++++++++++++++++++++++++++++++++-- drivers/usb/core/urb.c | 3 ++- drivers/usb/host/xhci.c | 4 ++++ include/linux/usb.h | 11 ++++++++++- include/linux/usb/usbnet.h | 1 + 6 files changed, 66 insertions(+), 4 deletions(-) Thanks, -- Ming Lei ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v2 1/4] USB: introduce usb_device_no_sg_constraint() helper 2013-08-05 8:46 [PATCH v2 0/4] USB & USBNET: loose SG check and support usbnet DMA SG Ming Lei @ 2013-08-05 8:47 ` Ming Lei [not found] ` <1375692423-9497-2-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> [not found] ` <1375692423-9497-1-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> ` (2 subsequent siblings) 3 siblings, 1 reply; 9+ messages in thread From: Ming Lei @ 2013-08-05 8:47 UTC (permalink / raw) To: David S. Miller, Greg Kroah-Hartman Cc: Oliver Neukum, Sarah Sharp, netdev, linux-usb, Ming Lei, Alan Stern Some host controllers(such as xHCI) can support building packet from discontinuous buffers, so introduce one flag and helper for this kind of host controllers, then the feature can help some applications(such as usbnet) by supporting arbitrary length of sg buffers. Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Ming Lei <ming.lei@canonical.com> --- drivers/usb/core/urb.c | 3 ++- include/linux/usb.h | 11 ++++++++++- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index e75115a..c77ec78 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -414,7 +414,8 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) urb->iso_frame_desc[n].status = -EXDEV; urb->iso_frame_desc[n].actual_length = 0; } - } else if (dev->speed != USB_SPEED_WIRELESS && urb->num_sgs) { + } else if (urb->num_sgs && !urb->dev->bus->no_sg_constraint && + dev->speed != USB_SPEED_WIRELESS) { struct scatterlist *sg; int i; diff --git a/include/linux/usb.h b/include/linux/usb.h index 84f14e2..46cc0f7 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -337,6 +337,7 @@ struct usb_bus { * the ep queue on a short transfer * with the URB_SHORT_NOT_OK flag set. */ + unsigned no_sg_constraint:1; /* no sg constraint */ unsigned sg_tablesize; /* 0 or largest number of sg list entries */ int devnum_next; /* Next open device number in @@ -684,6 +685,14 @@ static inline bool usb_device_supports_ltm(struct usb_device *udev) return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT; } +static inline bool usb_device_no_sg_constraint(struct usb_device *udev) +{ + if (udev && udev->bus && udev->bus->no_sg_constraint) + return true; + else + return false; +} + /*-------------------------------------------------------------------------*/ @@ -1249,7 +1258,7 @@ typedef void (*usb_complete_t)(struct urb *); * transfer_buffer. * @sg: scatter gather buffer list, the buffer size of each element in * the list (except the last) must be divisible by the endpoint's - * max packet size + * max packet size if no_sg_constraint isn't set in 'struct usb_bus' * @num_mapped_sgs: (internal) number of mapped sg entries * @num_sgs: number of entries in the sg list * @transfer_buffer_length: How big is transfer_buffer. The transfer may -- 1.7.9.5 ^ permalink raw reply related [flat|nested] 9+ messages in thread
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* Re: [PATCH v2 1/4] USB: introduce usb_device_no_sg_constraint() helper [not found] ` <1375692423-9497-2-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> @ 2013-08-05 14:07 ` Alan Stern [not found] ` <Pine.LNX.4.44L0.1308051005150.1239-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org> 0 siblings, 1 reply; 9+ messages in thread From: Alan Stern @ 2013-08-05 14:07 UTC (permalink / raw) To: Ming Lei Cc: David S. Miller, Greg Kroah-Hartman, Oliver Neukum, Sarah Sharp, netdev-u79uwXL29TY76Z2rM5mHXA, linux-usb-u79uwXL29TY76Z2rM5mHXA On Mon, 5 Aug 2013, Ming Lei wrote: > Some host controllers(such as xHCI) can support building > packet from discontinuous buffers, so introduce one flag > and helper for this kind of host controllers, then the > feature can help some applications(such as usbnet) by > supporting arbitrary length of sg buffers. > +static inline bool usb_device_no_sg_constraint(struct usb_device *udev) > +{ > + if (udev && udev->bus && udev->bus->no_sg_constraint) > + return true; > + else > + return false; > +} A more elegant implementation would be: return udev && udev->bus && udev->bus->no_sg_constraint; I doubt it will make any difference to the object code, though. Apart from that, this looks fine. Acked-by: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
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* Re: [PATCH v2 1/4] USB: introduce usb_device_no_sg_constraint() helper [not found] ` <Pine.LNX.4.44L0.1308051005150.1239-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org> @ 2013-08-05 14:33 ` Ming Lei 0 siblings, 0 replies; 9+ messages in thread From: Ming Lei @ 2013-08-05 14:33 UTC (permalink / raw) To: Alan Stern Cc: David S. Miller, Greg Kroah-Hartman, Oliver Neukum, Sarah Sharp, netdev-u79uwXL29TY76Z2rM5mHXA, linux-usb-u79uwXL29TY76Z2rM5mHXA On Mon, Aug 5, 2013 at 10:07 PM, Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org> wrote: > On Mon, 5 Aug 2013, Ming Lei wrote: > >> Some host controllers(such as xHCI) can support building >> packet from discontinuous buffers, so introduce one flag >> and helper for this kind of host controllers, then the >> feature can help some applications(such as usbnet) by >> supporting arbitrary length of sg buffers. > >> +static inline bool usb_device_no_sg_constraint(struct usb_device *udev) >> +{ >> + if (udev && udev->bus && udev->bus->no_sg_constraint) >> + return true; >> + else >> + return false; >> +} > > A more elegant implementation would be: > > return udev && udev->bus && udev->bus->no_sg_constraint; > > I doubt it will make any difference to the object code, though. Apart > from that, this looks fine. OK, this can save 3 line code, and I will take it in v3. > > Acked-by: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org> Thanks for your Ack and review. Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
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* [PATCH v2 2/4] USB: XHCI: mark no_sg_constraint [not found] ` <1375692423-9497-1-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> @ 2013-08-05 8:47 ` Ming Lei 0 siblings, 0 replies; 9+ messages in thread From: Ming Lei @ 2013-08-05 8:47 UTC (permalink / raw) To: David S. Miller, Greg Kroah-Hartman Cc: Oliver Neukum, Sarah Sharp, netdev-u79uwXL29TY76Z2rM5mHXA, linux-usb-u79uwXL29TY76Z2rM5mHXA, Ming Lei, Alan Stern This patch marks all xHCI controllers as no_sg_constraint since xHCI supports building packet from discontinuous buffers. Cc: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org> Acked-by: Sarah Sharp <sarah.a.sharp-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> Signed-off-by: Ming Lei <ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> --- drivers/usb/host/xhci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 2c49f00..6e2ac57 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4841,6 +4841,10 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) /* Accept arbitrarily long scatter-gather lists */ hcd->self.sg_tablesize = ~0; + + /* support to build packet from discontinuous buffers */ + hcd->self.no_sg_constraint = 1; + /* XHCI controllers don't stop the ep queue on short packets :| */ hcd->self.no_stop_on_short = 1; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v2 3/4] USBNET: support DMA SG 2013-08-05 8:46 [PATCH v2 0/4] USB & USBNET: loose SG check and support usbnet DMA SG Ming Lei 2013-08-05 8:47 ` [PATCH v2 1/4] USB: introduce usb_device_no_sg_constraint() helper Ming Lei [not found] ` <1375692423-9497-1-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> @ 2013-08-05 8:47 ` Ming Lei 2013-08-05 9:14 ` Oliver Neukum 2013-08-05 8:47 ` [PATCH v2 4/4] USBNET: ax88179_178a: enable tso if usb host supports sg dma Ming Lei 3 siblings, 1 reply; 9+ messages in thread From: Ming Lei @ 2013-08-05 8:47 UTC (permalink / raw) To: David S. Miller, Greg Kroah-Hartman Cc: Oliver Neukum, Sarah Sharp, netdev, linux-usb, Ming Lei, Eric Dumazet, Ben Hutchings, Grant Grundler, Freddy Xin, Alan Stern This patch introduces support of DMA SG if the USB host controller which usbnet device is attached to is capable of building packet from discontinuous buffers. The patch supports passing the skb fragment buffers to usb stack directly via urb->sg. Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ben Hutchings <bhutchings@solarflare.com> Cc: Grant Grundler <grundler@google.com> Cc: Freddy Xin <freddy@asix.com.tw> Cc: Oliver Neukum <oneukum@suse.de> Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Ming Lei <ming.lei@canonical.com> --- drivers/net/usb/usbnet.c | 39 +++++++++++++++++++++++++++++++++++++-- include/linux/usb/usbnet.h | 1 + 2 files changed, 38 insertions(+), 2 deletions(-) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index e4811d7..615d78e 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1232,6 +1232,37 @@ EXPORT_SYMBOL_GPL(usbnet_tx_timeout); /*-------------------------------------------------------------------------*/ +static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) +{ + unsigned num_sgs, total_len = 0; + int i, s = 0; + + num_sgs = skb_shinfo(skb)->nr_frags + 1; + if (num_sgs == 1) + return 0; + + urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist), GFP_ATOMIC); + if (!urb->sg) + return -ENOMEM; + + urb->num_sgs = num_sgs; + sg_init_table(urb->sg, urb->num_sgs); + + sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); + total_len += skb_headlen(skb); + + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; + + total_len += skb_frag_size(f); + sg_set_page(&urb->sg[i + s], f->page.p, f->size, + f->page_offset); + } + urb->transfer_buffer_length = total_len; + + return 1; +} + netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, struct net_device *net) { @@ -1258,7 +1289,6 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, goto drop; } } - length = skb->len; if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { netif_dbg(dev, tx_err, dev->net, "no urb\n"); @@ -1268,10 +1298,14 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, entry = (struct skb_data *) skb->cb; entry->urb = urb; entry->dev = dev; - entry->length = length; usb_fill_bulk_urb (urb, dev->udev, dev->out, skb->data, skb->len, tx_complete, skb); + if (dev->can_dma_sg) { + if (build_dma_sg(skb, urb) < 0) + goto drop; + } + entry->length = length = urb->transfer_buffer_length; /* don't assume the hardware handles USB_ZERO_PACKET * NOTE: strictly conforming cdc-ether devices should expect @@ -1391,6 +1425,7 @@ static void usbnet_bh (unsigned long param) rx_process (dev, skb); continue; case tx_done: + kfree(entry->urb->sg); case rx_cleanup: usb_free_urb (entry->urb); dev_kfree_skb (skb); diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h index 8fbc008..9cb2fe8 100644 --- a/include/linux/usb/usbnet.h +++ b/include/linux/usb/usbnet.h @@ -35,6 +35,7 @@ struct usbnet { unsigned char suspend_count; unsigned char pkt_cnt, pkt_err; unsigned short rx_qlen, tx_qlen; + unsigned can_dma_sg:1; /* i/o info: pipes etc */ unsigned in, out; -- 1.7.9.5 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH v2 3/4] USBNET: support DMA SG 2013-08-05 8:47 ` [PATCH v2 3/4] USBNET: support DMA SG Ming Lei @ 2013-08-05 9:14 ` Oliver Neukum 2013-08-05 9:23 ` Ming Lei 0 siblings, 1 reply; 9+ messages in thread From: Oliver Neukum @ 2013-08-05 9:14 UTC (permalink / raw) To: Ming Lei Cc: David S. Miller, Greg Kroah-Hartman, Sarah Sharp, netdev, linux-usb, Eric Dumazet, Ben Hutchings, Grant Grundler, Freddy Xin, Alan Stern On Mon, 2013-08-05 at 16:47 +0800, Ming Lei wrote: > @@ -1268,10 +1298,14 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, > entry = (struct skb_data *) skb->cb; > entry->urb = urb; > entry->dev = dev; > - entry->length = length; > > usb_fill_bulk_urb (urb, dev->udev, dev->out, > skb->data, skb->len, tx_complete, skb); > + if (dev->can_dma_sg) { > + if (build_dma_sg(skb, urb) < 0) > + goto drop; This is still missing a kfree() for urb->sg in the error case of usbnet_start_xmit(). Regards Oliver ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v2 3/4] USBNET: support DMA SG 2013-08-05 9:14 ` Oliver Neukum @ 2013-08-05 9:23 ` Ming Lei 0 siblings, 0 replies; 9+ messages in thread From: Ming Lei @ 2013-08-05 9:23 UTC (permalink / raw) To: Oliver Neukum Cc: David S. Miller, Greg Kroah-Hartman, Sarah Sharp, netdev, linux-usb, Eric Dumazet, Ben Hutchings, Grant Grundler, Freddy Xin, Alan Stern On Mon, Aug 5, 2013 at 5:14 PM, Oliver Neukum <oneukum@suse.de> wrote: > On Mon, 2013-08-05 at 16:47 +0800, Ming Lei wrote: > >> @@ -1268,10 +1298,14 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, >> entry = (struct skb_data *) skb->cb; >> entry->urb = urb; >> entry->dev = dev; >> - entry->length = length; >> >> usb_fill_bulk_urb (urb, dev->udev, dev->out, >> skb->data, skb->len, tx_complete, skb); >> + if (dev->can_dma_sg) { >> + if (build_dma_sg(skb, urb) < 0) >> + goto drop; > > This is still missing a kfree() for urb->sg in the error case > of usbnet_start_xmit(). Right, kfree(urb->sg) should be added before usb_free_urb (urb) in usbnet_start_xmit(), and will fix it in v3. Thanks, -- Ming Lei ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v2 4/4] USBNET: ax88179_178a: enable tso if usb host supports sg dma 2013-08-05 8:46 [PATCH v2 0/4] USB & USBNET: loose SG check and support usbnet DMA SG Ming Lei ` (2 preceding siblings ...) 2013-08-05 8:47 ` [PATCH v2 3/4] USBNET: support DMA SG Ming Lei @ 2013-08-05 8:47 ` Ming Lei 3 siblings, 0 replies; 9+ messages in thread From: Ming Lei @ 2013-08-05 8:47 UTC (permalink / raw) To: David S. Miller, Greg Kroah-Hartman Cc: Oliver Neukum, Sarah Sharp, netdev, linux-usb, Ming Lei, Eric Dumazet, Ben Hutchings, Grant Grundler, Alan Stern, Freddy Xin This patch enables 'can_dma_sg' flag for ax88179_178a device if the attached host controller supports building packet from discontinuous buffers(DMA SG is possible), so TSO can be enabled and skb fragment buffers can be passed to usb stack via urb->sg directly. With the patch, system CPU utilization decreased ~50% and throughput increased by ~10% when doing iperf client test on one ARM A15 dual core board. Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ben Hutchings <bhutchings@solarflare.com> Cc: Grant Grundler <grundler@google.com> Cc: Oliver Neukum <oneukum@suse.de> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Freddy Xin <freddy@asix.com.tw> Signed-off-by: Ming Lei <ming.lei@canonical.com> --- drivers/net/usb/ax88179_178a.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c index fb0caa2..7a96326 100644 --- a/drivers/net/usb/ax88179_178a.c +++ b/drivers/net/usb/ax88179_178a.c @@ -1031,12 +1031,20 @@ static int ax88179_bind(struct usbnet *dev, struct usb_interface *intf) dev->mii.phy_id = 0x03; dev->mii.supports_gmii = 1; + if (usb_device_no_sg_constraint(dev->udev)) + dev->can_dma_sg = 1; + dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM; dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM; + if (dev->can_dma_sg) { + dev->net->features |= NETIF_F_SG | NETIF_F_TSO; + dev->net->hw_features |= NETIF_F_SG | NETIF_F_TSO; + } + /* Enable checksum offload */ *tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP | AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6; @@ -1310,6 +1318,10 @@ static int ax88179_reset(struct usbnet *dev) dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM; + if (dev->can_dma_sg) { + dev->net->features |= NETIF_F_SG | NETIF_F_TSO; + dev->net->hw_features |= NETIF_F_SG | NETIF_F_TSO; + } /* Enable checksum offload */ *tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP | -- 1.7.9.5 ^ permalink raw reply related [flat|nested] 9+ messages in thread
end of thread, other threads:[~2013-08-05 14:33 UTC | newest] Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-08-05 8:46 [PATCH v2 0/4] USB & USBNET: loose SG check and support usbnet DMA SG Ming Lei 2013-08-05 8:47 ` [PATCH v2 1/4] USB: introduce usb_device_no_sg_constraint() helper Ming Lei [not found] ` <1375692423-9497-2-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> 2013-08-05 14:07 ` Alan Stern [not found] ` <Pine.LNX.4.44L0.1308051005150.1239-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org> 2013-08-05 14:33 ` Ming Lei [not found] ` <1375692423-9497-1-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> 2013-08-05 8:47 ` [PATCH v2 2/4] USB: XHCI: mark no_sg_constraint Ming Lei 2013-08-05 8:47 ` [PATCH v2 3/4] USBNET: support DMA SG Ming Lei 2013-08-05 9:14 ` Oliver Neukum 2013-08-05 9:23 ` Ming Lei 2013-08-05 8:47 ` [PATCH v2 4/4] USBNET: ax88179_178a: enable tso if usb host supports sg dma Ming Lei
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