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SubjectRe: [PATCH v3 2/2] usbip: Implement SG support to vhci-hcd and stub driver
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Hi Suwan,

On 8/2/19 11:36 AM, Suwan Kim wrote:
> There are bugs on vhci with usb 3.0 storage device.

This sentence doesn't make sense to me. What bugs? Ca you eloborate?

Currently, vhci
> doesn't supported SG, so USB storage driver on vhci breaks SG list
> into multiple URBs and it causes error that a transfer got terminated
> too early because the transfer length for one of the URBs was not
> divisible by the maxpacket size.
>
> In this patch, vhci supports SG regardless of whether the server's
> host controller supports SG or not, because stub driver splits SG
> list into several URBs if the server's host controller doesn't
> support SG.
>
> To support SG, vhci_map_urb_for_dma() sets URB_DMA_MAP_SG flag in
> urb->transfer_flags if URB has SG list and this flag will tell stub
> driver to use SG list.
>
> vhci sends each SG list entry to stub driver. Then, stub driver sees
> the total length of the buffer and allocates SG table and pages
> according to the total buffer length calling sgl_alloc(). After stub
> driver receives completed URB, it again sends each SG list entry to
> vhci.
>
> If the server's host controller doesn't support SG, stub driver
> breaks a single SG request into several URBs and submits them to
> the server's host controller. When all the split URBs are completed,
> stub driver reassembles the URBs into a single return command and
> sends it to vhci.
>
> Moreover, in the situation where vhci supports SG, but stub driver
> does not, or vice versa, usbip works normally. Because there is no
> protocol modification, there is no problem in communication between
> server and client even if the one has a kernel without SG support.
>
> In the case of vhci supports SG and stub driver doesn't, because
> vhci sends only the total length of the buffer to stub driver as
> it did before the patch applied, stub driver only needs to allocate
> the required length of buffers regardless of whether vhci supports
> SG or not.
>
> If stub driver needs to send data buffer to vhci because of IN pipe,
> stub driver also sends only total length of buffer as metadata and
> then sends real data as vhci does. Then vhci receive data from stub
> driver and store it to the corresponding buffer of SG list entry.
>
> In the case of stub driver that supports SG, buffer is allocated by
> sgl_alloc(). However, stub driver that does not support SG allocates
> buffer using only kmalloc(). Therefore, if vhci supports SG and stub
> driver doesn't, stub driver has to allocate buffer with kmalloc() as
> much as the total length of SG buffer which is quite huge when vhci
> sends SG request, so it has big overhead in buffer allocation.
>
> And for the case of stub driver supports SG and vhci doesn't, since
> the USB storage driver checks that vhci doesn't support SG and sends
> the request to stub driver by splitting the SG list into multiple
> URBs, stub driver allocates a buffer with kmalloc() as it did before
> this patch.
>
> Signed-off-by: Suwan Kim <suwan.kim027@gmail.com>
> ---

Please add patch revision history to help reviews. What did you
change in this patch from previous version.


> drivers/usb/usbip/stub.h | 7 +-
> drivers/usb/usbip/stub_main.c | 55 ++++++---
> drivers/usb/usbip/stub_rx.c | 203 ++++++++++++++++++++++---------
> drivers/usb/usbip/stub_tx.c | 99 +++++++++++----
> drivers/usb/usbip/usbip_common.c | 59 ++++++---
> drivers/usb/usbip/vhci_hcd.c | 15 ++-
> drivers/usb/usbip/vhci_tx.c | 63 ++++++++--
> 7 files changed, 375 insertions(+), 126 deletions(-)
>
> diff --git a/drivers/usb/usbip/stub.h b/drivers/usb/usbip/stub.h
> index 35618ceb2791..d11270560c24 100644
> --- a/drivers/usb/usbip/stub.h
> +++ b/drivers/usb/usbip/stub.h
> @@ -52,7 +52,11 @@ struct stub_priv {
> unsigned long seqnum;
> struct list_head list;
> struct stub_device *sdev;
> - struct urb *urb;
> + struct urb **urbs;
> + struct scatterlist *sgl;
> + int num_urbs;
> + int completed_urbs;
> + int urb_status;
>
> int unlinking;
> };
> @@ -86,6 +90,7 @@ extern struct usb_device_driver stub_driver;
> struct bus_id_priv *get_busid_priv(const char *busid);
> void put_busid_priv(struct bus_id_priv *bid);
> int del_match_busid(char *busid);
> +void stub_free_priv_and_urb(struct stub_priv *priv);
> void stub_device_cleanup_urbs(struct stub_device *sdev);
>
> /* stub_rx.c */
> diff --git a/drivers/usb/usbip/stub_main.c b/drivers/usb/usbip/stub_main.c
> index 2e4bfccd4bfc..3ee636215e9c 100644
> --- a/drivers/usb/usbip/stub_main.c
> +++ b/drivers/usb/usbip/stub_main.c
> @@ -6,6 +6,7 @@
> #include <linux/string.h>
> #include <linux/module.h>
> #include <linux/device.h>
> +#include <linux/scatterlist.h>
>
> #include "usbip_common.h"
> #include "stub.h"
> @@ -288,6 +289,42 @@ static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
> return NULL;
> }
>
> +void stub_free_priv_and_urb(struct stub_priv *priv)
> +{
> + struct urb *urb;
> + int i;
> +
> + for (i = 0; i < priv->num_urbs; i++) {
> + urb = priv->urbs[i];
> +
> + if (!urb)
> + return;
> +
> + kfree(urb->setup_packet);
> + urb->setup_packet = NULL;
> +
> +
> + if (urb->transfer_buffer && !priv->sgl) {
> + kfree(urb->transfer_buffer);
> + urb->transfer_buffer = NULL;
> + }
> +
> + if (urb->num_sgs) {
> + sgl_free(urb->sg);
> + urb->sg = NULL;
> + urb->num_sgs = 0;
> + }
> +
> + usb_free_urb(urb);
> + }
> +
> + list_del(&priv->list);
> + if (priv->sgl)
> + sgl_free(priv->sgl);
> + kfree(priv->urbs);
> + kmem_cache_free(stub_priv_cache, priv);
> +}
> +
> static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
> {
> unsigned long flags;
> @@ -314,25 +351,15 @@ static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
> void stub_device_cleanup_urbs(struct stub_device *sdev)
> {
> struct stub_priv *priv;
> - struct urb *urb;
> + int i;
>
> dev_dbg(&sdev->udev->dev, "Stub device cleaning up urbs\n");
>
> while ((priv = stub_priv_pop(sdev))) {
> - urb = priv->urb;
> - dev_dbg(&sdev->udev->dev, "free urb seqnum %lu\n",
> - priv->seqnum);
> - usb_kill_urb(urb);
> + for (i = 0; i < priv->num_urbs; i++)
> + usb_kill_urb(priv->urbs[i]);
>
> - kmem_cache_free(stub_priv_cache, priv);
> -
> - kfree(urb->transfer_buffer);
> - urb->transfer_buffer = NULL;
> -
> - kfree(urb->setup_packet);
> - urb->setup_packet = NULL;
> -
> - usb_free_urb(urb);
> + stub_free_priv_and_urb(priv);
> }
> }
>
> diff --git a/drivers/usb/usbip/stub_rx.c b/drivers/usb/usbip/stub_rx.c
> index b0a855acafa3..7630012f6827 100644
> --- a/drivers/usb/usbip/stub_rx.c
> +++ b/drivers/usb/usbip/stub_rx.c
> @@ -7,6 +7,7 @@
> #include <linux/kthread.h>
> #include <linux/usb.h>
> #include <linux/usb/hcd.h>
> +#include <linux/scatterlist.h>
>
> #include "usbip_common.h"
> #include "stub.h"
> @@ -201,7 +202,7 @@ static void tweak_special_requests(struct urb *urb)
> static int stub_recv_cmd_unlink(struct stub_device *sdev,
> struct usbip_header *pdu)
> {
> - int ret;
> + int ret, i;
> unsigned long flags;
> struct stub_priv *priv;
>
> @@ -246,12 +247,13 @@ static int stub_recv_cmd_unlink(struct stub_device *sdev,
> * so a driver in a client host will know the failure
> * of the unlink request ?
> */
> - ret = usb_unlink_urb(priv->urb);
> - if (ret != -EINPROGRESS)
> - dev_err(&priv->urb->dev->dev,
> - "failed to unlink a urb # %lu, ret %d\n",
> - priv->seqnum, ret);
> -
> + for (i = priv->completed_urbs; i < priv->num_urbs; i++) {
> + ret = usb_unlink_urb(priv->urbs[i]);
> + if (ret != -EINPROGRESS)
> + dev_err(&priv->urbs[i]->dev->dev,
> + "failed to unlink a urb # %lu, ret %d\n",
> + priv->seqnum, ret);

I am concerned about printing this message in this loop. It made sense
when there is just one urb.

> + }
> return 0;
> }
>
> @@ -433,14 +435,36 @@ static void masking_bogus_flags(struct urb *urb)
> urb->transfer_flags &= allowed;
> }
>
> +static int stub_recv_xbuff(struct usbip_device *ud, struct stub_priv *priv)
> +{
> + int ret;
> + int i;
> +
> + for (i = 0; i < priv->num_urbs; i++) {
> + ret = usbip_recv_xbuff(ud, priv->urbs[i]);
> + if (ret < 0)
> + break;
> + }
> +
> + return ret;
> +}
> +
> static void stub_recv_cmd_submit(struct stub_device *sdev,
> struct usbip_header *pdu)
> {
> - int ret;
> struct stub_priv *priv;
> struct usbip_device *ud = &sdev->ud;
> struct usb_device *udev = sdev->udev;
> + struct scatterlist *sgl = NULL, *sg;
> + void *buffer = NULL;
> + unsigned long long buf_len;
> + int nents;
> + int num_urbs = 1;
> int pipe = get_pipe(sdev, pdu);
> + int use_sg = pdu->u.cmd_submit.transfer_flags & URB_DMA_MAP_SG;
> + int support_sg = 1;
> + int np = 0;
> + int ret, i;
>
> if (pipe == -1)
> return;
> @@ -449,76 +473,139 @@ static void stub_recv_cmd_submit(struct stub_device *sdev,
> if (!priv)
> return;
>
> - /* setup a urb */
> - if (usb_pipeisoc(pipe))
> - priv->urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
> - GFP_KERNEL);
> - else
> - priv->urb = usb_alloc_urb(0, GFP_KERNEL);
> + buf_len = (unsigned long long)pdu->u.cmd_submit.transfer_buffer_length;
>
> - if (!priv->urb) {
> - usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
> - return;
> + /* allocate urb transfer buffer, if needed */
> + if (buf_len) {
> + if (use_sg) {
> + sgl = sgl_alloc(buf_len, GFP_KERNEL, &nents);
> + if (!sgl)
> + goto err_malloc;
> + } else {
> + buffer = kzalloc(buf_len, GFP_KERNEL);
> + if (!buffer)
> + goto err_malloc;
> + }
> }
>
> - /* allocate urb transfer buffer, if needed */
> - if (pdu->u.cmd_submit.transfer_buffer_length > 0) {
> - priv->urb->transfer_buffer =
> - kzalloc(pdu->u.cmd_submit.transfer_buffer_length,
> - GFP_KERNEL);
> - if (!priv->urb->transfer_buffer) {
> + /* Check if the server's HCD supports SG */
> + if (use_sg && !udev->bus->sg_tablesize) {
> + /*
> + * If the server's HCD doesn't support SG, break a single SG
> + * request into several URBs and map each SG list entry to
> + * corresponding URB buffer. The previously allocated SG
> + * list is stored in priv->sgl (If the server's HCD support SG,
> + * SG list is stored only in urb->sg) and it is used as an
> + * indicator that the server split single SG request into
> + * several URBs. Later, priv->sgl is used by stub_complete() and
> + * stub_send_ret_submit() to reassemble the divied URBs.
> + */
> + support_sg = 0;
> + num_urbs = nents;
> + priv->completed_urbs = 0;
> + pdu->u.cmd_submit.transfer_flags &= ~URB_DMA_MAP_SG;
> + }
> +
> + /* allocate urb array */
> + priv->num_urbs = num_urbs;
> + priv->urbs = kmalloc_array(num_urbs, sizeof(*priv->urbs), GFP_KERNEL);
> + if (!priv->urbs)
> + goto err_urbs;
> +
> + /* setup a urb */
> + if (support_sg) {
> + if (usb_pipeisoc(pipe))
> + np = pdu->u.cmd_submit.number_of_packets;
> +
> + priv->urbs[0] = usb_alloc_urb(np, GFP_KERNEL);
> + if (!priv->urbs[0])
> + goto err_urb;
> +
> + if (buf_len) {
> + if (use_sg) {
> + priv->urbs[0]->sg = sgl;
> + priv->urbs[0]->num_sgs = nents;
> + priv->urbs[0]->transfer_buffer = NULL;
> + } else {
> + priv->urbs[0]->transfer_buffer = buffer;
> + }
> + }
> +
> + /* copy urb setup packet */
> + priv->urbs[0]->setup_packet = kmemdup(&pdu->u.cmd_submit.setup,
> + 8, GFP_KERNEL);
> + if (!priv->urbs[0]->setup_packet) {
> usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
> return;
> }
> - }
>
> - /* copy urb setup packet */
> - priv->urb->setup_packet = kmemdup(&pdu->u.cmd_submit.setup, 8,
> - GFP_KERNEL);
> - if (!priv->urb->setup_packet) {
> - dev_err(&udev->dev, "allocate setup_packet\n");
> - usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
> - return;
> + usbip_pack_pdu(pdu, priv->urbs[0], USBIP_CMD_SUBMIT, 0);
> + } else {
> + for_each_sg(sgl, sg, nents, i) {
> + priv->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
> + /* The URBs which is previously allocated will be freed
> + * in stub_device_cleanup_urbs() if error occurs.
> + */
> + if (!priv->urbs[i])
> + goto err_urb;
> +
> + usbip_pack_pdu(pdu, priv->urbs[i], USBIP_CMD_SUBMIT, 0);
> + priv->urbs[i]->transfer_buffer = sg_virt(sg);
> + priv->urbs[i]->transfer_buffer_length = sg->length;
> + }
> + priv->sgl = sgl;
> }
>
> - /* set other members from the base header of pdu */
> - priv->urb->context = (void *) priv;
> - priv->urb->dev = udev;
> - priv->urb->pipe = pipe;
> - priv->urb->complete = stub_complete;
> + for (i = 0; i < num_urbs; i++) {
> + /* set other members from the base header of pdu */
> + priv->urbs[i]->context = (void *) priv;
> + priv->urbs[i]->dev = udev;
> + priv->urbs[i]->pipe = pipe;
> + priv->urbs[i]->complete = stub_complete;
>
> - usbip_pack_pdu(pdu, priv->urb, USBIP_CMD_SUBMIT, 0);
> + /* no need to submit an intercepted request, but harmless? */
> + tweak_special_requests(priv->urbs[i]);
>
> + masking_bogus_flags(priv->urbs[i]);
> + }
>
> - if (usbip_recv_xbuff(ud, priv->urb) < 0)
> + if (stub_recv_xbuff(ud, priv) < 0)
> return;
>
> - if (usbip_recv_iso(ud, priv->urb) < 0)
> + if (usbip_recv_iso(ud, priv->urbs[0]) < 0)
> return;
>
> - /* no need to submit an intercepted request, but harmless? */
> - tweak_special_requests(priv->urb);
> -
> - masking_bogus_flags(priv->urb);
> /* urb is now ready to submit */
> - ret = usb_submit_urb(priv->urb, GFP_KERNEL);
> -
> - if (ret == 0)
> - usbip_dbg_stub_rx("submit urb ok, seqnum %u\n",
> - pdu->base.seqnum);
> - else {
> - dev_err(&udev->dev, "submit_urb error, %d\n", ret);
> - usbip_dump_header(pdu);
> - usbip_dump_urb(priv->urb);
> -
> - /*
> - * Pessimistic.
> - * This connection will be discarded.
> - */
> - usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT);
> + for (i = 0; i < priv->num_urbs; i++) {
> + ret = usb_submit_urb(priv->urbs[i], GFP_KERNEL);
> +
> + if (ret == 0)
> + usbip_dbg_stub_rx("submit urb ok, seqnum %u\n",
> + pdu->base.seqnum);
> + else {
> + dev_err(&udev->dev, "submit_urb error, %d\n", ret);
> + usbip_dump_header(pdu);
> + usbip_dump_urb(priv->urbs[i]);
> +
> + /*
> + * Pessimistic.
> + * This connection will be discarded.
> + */
> + usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT);
> + break;
> + }
> }
>
> usbip_dbg_stub_rx("Leave\n");
> + return;
> +
> +err_urb:
> + kfree(priv->urbs);
> +err_urbs:
> + kfree(buffer);
> + sgl_free(sgl);
> +err_malloc:
> + usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
> }
>
> /* recv a pdu */
> diff --git a/drivers/usb/usbip/stub_tx.c b/drivers/usb/usbip/stub_tx.c
> index f0ec41a50cbc..36010a82b359 100644
> --- a/drivers/usb/usbip/stub_tx.c
> +++ b/drivers/usb/usbip/stub_tx.c
> @@ -5,25 +5,11 @@
>
> #include <linux/kthread.h>
> #include <linux/socket.h>
> +#include <linux/scatterlist.h>
>
> #include "usbip_common.h"
> #include "stub.h"
>
> -static void stub_free_priv_and_urb(struct stub_priv *priv)
> -{
> - struct urb *urb = priv->urb;
> -
> - kfree(urb->setup_packet);
> - urb->setup_packet = NULL;
> -
> - kfree(urb->transfer_buffer);
> - urb->transfer_buffer = NULL;
> -
> - list_del(&priv->list);
> - kmem_cache_free(stub_priv_cache, priv);
> - usb_free_urb(urb);
> -}
> -
> /* be in spin_lock_irqsave(&sdev->priv_lock, flags) */
> void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
> __u32 status)
> @@ -85,6 +71,22 @@ void stub_complete(struct urb *urb)
> break;
> }
>
> + /*
> + * If the server breaks single SG request into the several URBs, the
> + * URBs must be reassembled before sending completed URB to the vhci.
> + * Don't wake up the tx thread until all the URBs are completed.
> + */
> + if (priv->sgl) {
> + priv->completed_urbs++;
> +
> + /* Only save the first error status */
> + if (urb->status && !priv->urb_status)
> + priv->urb_status = urb->status;
> +
> + if (priv->completed_urbs < priv->num_urbs)
> + return;
> + }
> +
> /* link a urb to the queue of tx. */
> spin_lock_irqsave(&sdev->priv_lock, flags);
> if (sdev->ud.tcp_socket == NULL) {
> @@ -156,18 +158,22 @@ static int stub_send_ret_submit(struct stub_device *sdev)
> size_t total_size = 0;
>
> while ((priv = dequeue_from_priv_tx(sdev)) != NULL) {
> - int ret;
> - struct urb *urb = priv->urb;
> + struct urb *urb = priv->urbs[0];
> struct usbip_header pdu_header;
> struct usbip_iso_packet_descriptor *iso_buffer = NULL;
> struct kvec *iov = NULL;
> + struct scatterlist *sg;
> + u32 actual_length = 0;
> int iovnum = 0;
> + int ret;
> + int i;
>
> txsize = 0;
> memset(&pdu_header, 0, sizeof(pdu_header));
> memset(&msg, 0, sizeof(msg));
>
> - if (urb->actual_length > 0 && !urb->transfer_buffer) {
> + if (urb->actual_length > 0 && !urb->transfer_buffer &&
> + !urb->num_sgs) {
> dev_err(&sdev->udev->dev,
> "urb: actual_length %d transfer_buffer null\n",
> urb->actual_length);
> @@ -176,6 +182,11 @@ static int stub_send_ret_submit(struct stub_device *sdev)
>
> if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
> iovnum = 2 + urb->number_of_packets;
> + else if (usb_pipein(urb->pipe) && urb->actual_length > 0 &&
> + urb->num_sgs)
> + iovnum = 1 + urb->num_sgs;
> + else if (usb_pipein(urb->pipe) && priv->sgl)
> + iovnum = 1 + priv->num_urbs;
> else
> iovnum = 2;
>
> @@ -192,6 +203,15 @@ static int stub_send_ret_submit(struct stub_device *sdev)
> setup_ret_submit_pdu(&pdu_header, urb);
> usbip_dbg_stub_tx("setup txdata seqnum: %d\n",
> pdu_header.base.seqnum);
> +
> + if (priv->sgl) {
> + for (i = 0; i < priv->num_urbs; i++)
> + actual_length += priv->urbs[i]->actual_length;
> +
> + pdu_header.u.ret_submit.status = priv->urb_status;
> + pdu_header.u.ret_submit.actual_length = actual_length;
> + }
> +
> usbip_header_correct_endian(&pdu_header, 1);
>
> iov[iovnum].iov_base = &pdu_header;
> @@ -200,12 +220,47 @@ static int stub_send_ret_submit(struct stub_device *sdev)
> txsize += sizeof(pdu_header);
>
> /* 2. setup transfer buffer */
> - if (usb_pipein(urb->pipe) &&
> + if (usb_pipein(urb->pipe) && priv->sgl) {
> + /* If the server split a single SG request into several
> + * URBs because the server's HCD doesn't support SG,
> + * reassemble the split URB buffers into a single
> + * return command.
> + */
> + for (i = 0; i < priv->num_urbs; i++) {
> + iov[iovnum].iov_base =
> + priv->urbs[i]->transfer_buffer;
> + iov[iovnum].iov_len =
> + priv->urbs[i]->actual_length;
> + iovnum++;
> + }
> + txsize += actual_length;
> + } else if (usb_pipein(urb->pipe) &&
> usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS &&
> urb->actual_length > 0) {
> - iov[iovnum].iov_base = urb->transfer_buffer;
> - iov[iovnum].iov_len = urb->actual_length;
> - iovnum++;
> + if (urb->num_sgs) {
> + unsigned int copy = urb->actual_length;
> + int size;
> +
> + for_each_sg(urb->sg, sg, urb->num_sgs, i) {
> + if (copy == 0)
> + break;
> +
> + if (copy < sg->length)
> + size = copy;
> + else
> + size = sg->length;
> +
> + iov[iovnum].iov_base = sg_virt(sg);
> + iov[iovnum].iov_len = size;
> +
> + iovnum++;
> + copy -= size;
> + }
> + } else {
> + iov[iovnum].iov_base = urb->transfer_buffer;
> + iov[iovnum].iov_len = urb->actual_length;
> + iovnum++;
> + }
> txsize += urb->actual_length;
> } else if (usb_pipein(urb->pipe) &&
> usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
> diff --git a/drivers/usb/usbip/usbip_common.c b/drivers/usb/usbip/usbip_common.c
> index 45da3e01c7b0..6532d68e8808 100644
> --- a/drivers/usb/usbip/usbip_common.c
> +++ b/drivers/usb/usbip/usbip_common.c
> @@ -680,8 +680,12 @@ EXPORT_SYMBOL_GPL(usbip_pad_iso);
> /* some members of urb must be substituted before. */
> int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
> {
> - int ret;
> + struct scatterlist *sg;
> + int ret = 0;
> + int recv;
> int size;
> + int copy;
> + int i;
>
> if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) {
> /* the direction of urb must be OUT. */
> @@ -701,29 +705,48 @@ int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
> if (!(size > 0))
> return 0;
>
> - if (size > urb->transfer_buffer_length) {
> + if (size > urb->transfer_buffer_length)
> /* should not happen, probably malicious packet */
> - if (ud->side == USBIP_STUB) {
> - usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
> - return 0;
> - } else {
> - usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
> - return -EPIPE;
> - }
> - }
> + goto error;
>
> - ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
> - if (ret != size) {
> - dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
> - if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) {
> - usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
> - } else {
> - usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
> - return -EPIPE;
> + if (urb->num_sgs) {
> + copy = size;
> + for_each_sg(urb->sg, sg, urb->num_sgs, i) {
> + int recv_size;
> +
> + if (copy < sg->length)
> + recv_size = copy;
> + else
> + recv_size = sg->length;
> +
> + recv = usbip_recv(ud->tcp_socket, sg_virt(sg),
> + recv_size);
> +
> + if (recv != recv_size)
> + goto error;
> +
> + copy -= recv;
> + ret += recv;
> }
> +
> + if (ret != size)
> + goto error;
> + } else {
> + ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
> + if (ret != size)
> + goto error;
> }
>
> return ret;
> +
> +error:
> + dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
> + if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)

Did you test VUDC and USB lowspeed cases? If you haven't please
test those two cases for regressions.

thanks,
-- Shuah

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