ice: make writes to /dev/gnssX synchronous

The current ice driver's GNSS write implementation buffers writes and
works through them asynchronously in a kthread. That's bad because:
 - The GNSS write_raw operation is supposed to be synchronous[1][2].
 - There is no upper bound on the number of pending writes.
   Userspace can submit writes much faster than the driver can process,
   consuming unlimited amounts of kernel memory.

A patch that's currently on review[3] ("[v3,net] ice: Write all GNSS
buffers instead of first one") would add one more problem:
 - The possibility of waiting for a very long time to flush the write
   work when doing rmmod, softlockups.

To fix these issues, simplify the implementation: Drop the buffering,
the write_work, and make the writes synchronous.

I tested this with gpsd and ubxtool.

[1] https://events19.linuxfoundation.org/wp-content/uploads/2017/12/The-GNSS-Subsystem-Johan-Hovold-Hovold-Consulting-AB.pdf
    "User interface" slide.
[2] A comment in drivers/gnss/core.c:gnss_write():
        /* Ignoring O_NONBLOCK, write_raw() is synchronous. */
[3] https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20230217120541.16745-1-karol.kolacinski@intel.com/

Fixes: d6b98c8d242a ("ice: add write functionality for GNSS TTY")
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 0157f6e..eb2dc09 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -5160,7 +5160,7 @@ ice_aq_read_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
  */
 int
 ice_aq_write_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
-                u16 bus_addr, __le16 addr, u8 params, u8 *data,
+                u16 bus_addr, __le16 addr, u8 params, const u8 *data,
                 struct ice_sq_cd *cd)
 {
        struct ice_aq_desc desc = { 0 };

diff --git a/drivers/net/ethernet/intel/ice/ice_common.h b/drivers/net/ethernet/intel/ice/ice_common.h
index 8ba5f93..81961a7 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_common.h
+++ b/drivers/net/ethernet/intel/ice/ice_common.h
@@ -229,7 +229,7 @@ ice_aq_read_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
                struct ice_sq_cd *cd);
 int
 ice_aq_write_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
-                u16 bus_addr, __le16 addr, u8 params, u8 *data,
+                u16 bus_addr, __le16 addr, u8 params, const u8 *data,
                 struct ice_sq_cd *cd);
 bool ice_fw_supports_report_dflt_cfg(struct ice_hw *hw);
 #endif /* _ICE_COMMON_H_ */

diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.c b/drivers/net/ethernet/intel/ice/ice_gnss.c
index 2ea8a2b..bd0ed15 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_gnss.c
+++ b/drivers/net/ethernet/intel/ice/ice_gnss.c
@@ -16,8 +16,8 @@
  * * number of bytes written - success
  * * negative - error code
  */
-static unsigned int
-ice_gnss_do_write(struct ice_pf *pf, unsigned char *buf, unsigned int size)
+static int
+ice_gnss_do_write(struct ice_pf *pf, const unsigned char *buf, unsigned int size)
 {
        struct ice_aqc_link_topo_addr link_topo;
        struct ice_hw *hw = &pf->hw;
@@ -72,39 +72,7 @@ err_out:
        dev_err(ice_pf_to_dev(pf), "GNSS failed to write, offset=%u, size=%u, err=%d\n",
                offset, size, err);
 
-       return offset;
-}
-
-/**
- * ice_gnss_write_pending - Write all pending data to internal GNSS
- * @work: GNSS write work structure
- */
-static void ice_gnss_write_pending(struct kthread_work *work)
-{
-       struct gnss_serial *gnss = container_of(work, struct gnss_serial,
-                                               write_work);
-       struct ice_pf *pf = gnss->back;
-
-       if (!pf)
-               return;
-
-       if (!test_bit(ICE_FLAG_GNSS, pf->flags))
-               return;
-
-       if (!list_empty(&gnss->queue)) {
-               struct gnss_write_buf *write_buf = NULL;
-               unsigned int bytes;
-
-               write_buf = list_first_entry(&gnss->queue,
-                                            struct gnss_write_buf, queue);
-
-               bytes = ice_gnss_do_write(pf, write_buf->buf, write_buf->size);
-               dev_dbg(ice_pf_to_dev(pf), "%u bytes written to GNSS\n", bytes);
-
-               list_del(&write_buf->queue);
-               kfree(write_buf->buf);
-               kfree(write_buf);
-       }
+       return err;
 }
 
 /**
@@ -220,8 +188,6 @@ static struct gnss_serial *ice_gnss_struct_init(struct ice_pf *pf)
        pf->gnss_serial = gnss;
 
        kthread_init_delayed_work(&gnss->read_work, ice_gnss_read);
-       INIT_LIST_HEAD(&gnss->queue);
-       kthread_init_work(&gnss->write_work, ice_gnss_write_pending);
        kworker = kthread_create_worker(0, "ice-gnss-%s", dev_name(dev));
        if (IS_ERR(kworker)) {
                kfree(gnss);
@@ -281,7 +247,6 @@ static void ice_gnss_close(struct gnss_device *gdev)
        if (!gnss)
                return;
 
-       kthread_cancel_work_sync(&gnss->write_work);
        kthread_cancel_delayed_work_sync(&gnss->read_work);
 }
 
@@ -300,10 +265,7 @@ ice_gnss_write(struct gnss_device *gdev, const unsigned char *buf,
               size_t count)
 {
        struct ice_pf *pf = gnss_get_drvdata(gdev);
-       struct gnss_write_buf *write_buf;
        struct gnss_serial *gnss;
-       unsigned char *cmd_buf;
-       int err = count;
 
        /* We cannot write a single byte using our I2C implementation. */
        if (count <= 1 || count > ICE_GNSS_TTY_WRITE_BUF)
@@ -319,24 +281,7 @@ ice_gnss_write(struct gnss_device *gdev, const unsigned char *buf,
        if (!gnss)
                return -ENODEV;
 
-       cmd_buf = kcalloc(count, sizeof(*buf), GFP_KERNEL);
-       if (!cmd_buf)
-               return -ENOMEM;
-
-       memcpy(cmd_buf, buf, count);
-       write_buf = kzalloc(sizeof(*write_buf), GFP_KERNEL);
-       if (!write_buf) {
-               kfree(cmd_buf);
-               return -ENOMEM;
-       }
-
-       write_buf->buf = cmd_buf;
-       write_buf->size = count;
-       INIT_LIST_HEAD(&write_buf->queue);
-       list_add_tail(&write_buf->queue, &gnss->queue);
-       kthread_queue_work(gnss->kworker, &gnss->write_work);
-
-       return err;
+       return ice_gnss_do_write(pf, buf, count);
 }
 
 static const struct gnss_operations ice_gnss_ops = {
@@ -432,7 +377,6 @@ void ice_gnss_exit(struct ice_pf *pf)
        if (pf->gnss_serial) {
                struct gnss_serial *gnss = pf->gnss_serial;
 
-               kthread_cancel_work_sync(&gnss->write_work);
                kthread_cancel_delayed_work_sync(&gnss->read_work);
                kthread_destroy_worker(gnss->kworker);
                gnss->kworker = NULL;

diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.h b/drivers/net/ethernet/intel/ice/ice_gnss.h
index b8bb8b6..75e567a 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_gnss.h
+++ b/drivers/net/ethernet/intel/ice/ice_gnss.h
@@ -22,26 +22,16 @@
  */
 #define ICE_GNSS_UBX_WRITE_BYTES       (ICE_MAX_I2C_WRITE_BYTES + 1)
 
-struct gnss_write_buf {
-       struct list_head queue;
-       unsigned int size;
-       unsigned char *buf;
-};
-
 /**
  * struct gnss_serial - data used to initialize GNSS TTY port
  * @back: back pointer to PF
  * @kworker: kwork thread for handling periodic work
  * @read_work: read_work function for handling GNSS reads
- * @write_work: write_work function for handling GNSS writes
- * @queue: write buffers queue
  */
 struct gnss_serial {
        struct ice_pf *back;
        struct kthread_worker *kworker;
        struct kthread_delayed_work read_work;
-       struct kthread_work write_work;
-       struct list_head queue;
 };
 
 #if IS_ENABLED(CONFIG_GNSS)