target/linux/generic/backport-5.4/742-v5.5-net-sfp-add-support-for-module-quirks.patch

   1 From 8df5dd55cef48c0769379e04dbc085a899b106d4 Mon Sep 17 00:00:00 2001
   2 From: Russell King <rmk+kernel@armlinux.org.uk>
   3 Date: Fri, 8 Mar 2019 14:02:25 +0000
   4 Subject: [PATCH 640/660] net: sfp: add support for module quirks
   5
   6 Add support for applying module quirks to the list of supported
   7 ethtool link modes.
   8
   9 Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
  10 ---
  11  drivers/net/phy/sfp-bus.c | 54 +++++++++++++++++++++++++++++++++++++++
  12  1 file changed, 54 insertions(+)
  13
  14 --- a/drivers/net/phy/sfp-bus.c
  15 +++ b/drivers/net/phy/sfp-bus.c
  16 @@ -10,6 +10,12 @@
  17
  18  #include "sfp.h"
  19
  20 +struct sfp_quirk {
  21 +       const char *vendor;
  22 +       const char *part;
  23 +       void (*modes)(const struct sfp_eeprom_id *id, unsigned long *modes);
  24 +};
  25 +
  26  /**
  27   * struct sfp_bus - internal representation of a sfp bus
  28   */
  29 @@ -22,6 +28,7 @@ struct sfp_bus {
  30         const struct sfp_socket_ops *socket_ops;
  31         struct device *sfp_dev;
  32         struct sfp *sfp;
  33 +       const struct sfp_quirk *sfp_quirk;
  34
  35         const struct sfp_upstream_ops *upstream_ops;
  36         void *upstream;
  37 @@ -31,6 +38,46 @@ struct sfp_bus {
  38         bool started;
  39  };
  40
  41 +static const struct sfp_quirk sfp_quirks[] = {
  42 +};
  43 +
  44 +static size_t sfp_strlen(const char *str, size_t maxlen)
  45 +{
  46 +       size_t size, i;
  47 +
  48 +       /* Trailing characters should be filled with space chars */
  49 +       for (i = 0, size = 0; i < maxlen; i++)
  50 +               if (str[i] != ' ')
  51 +                       size = i + 1;
  52 +
  53 +       return size;
  54 +}
  55 +
  56 +static bool sfp_match(const char *qs, const char *str, size_t len)
  57 +{
  58 +       if (!qs)
  59 +               return true;
  60 +       if (strlen(qs) != len)
  61 +               return false;
  62 +       return !strncmp(qs, str, len);
  63 +}
  64 +
  65 +static const struct sfp_quirk *sfp_lookup_quirk(const struct sfp_eeprom_id *id)
  66 +{
  67 +       const struct sfp_quirk *q;
  68 +       unsigned int i;
  69 +       size_t vs, ps;
  70 +
  71 +       vs = sfp_strlen(id->base.vendor_name, ARRAY_SIZE(id->base.vendor_name));
  72 +       ps = sfp_strlen(id->base.vendor_pn, ARRAY_SIZE(id->base.vendor_pn));
  73 +
  74 +       for (i = 0, q = sfp_quirks; i < ARRAY_SIZE(sfp_quirks); i++, q++)
  75 +               if (sfp_match(q->vendor, id->base.vendor_name, vs) &&
  76 +                   sfp_match(q->part, id->base.vendor_pn, ps))
  77 +                       return q;
  78 +
  79 +       return NULL;
  80 +}
  81  /**
  82   * sfp_parse_port() - Parse the EEPROM base ID, setting the port type
  83   * @bus: a pointer to the &struct sfp_bus structure for the sfp module
  84 @@ -234,6 +281,9 @@ void sfp_parse_support(struct sfp_bus *b
  85                         phylink_set(modes, 1000baseX_Full);
  86         }
  87
  88 +       if (bus->sfp_quirk)
  89 +               bus->sfp_quirk->modes(id, modes);
  90 +
  91         bitmap_or(support, support, modes, __ETHTOOL_LINK_MODE_MASK_NBITS);
  92
  93         phylink_set(support, Autoneg);
  94 @@ -610,6 +660,8 @@ int sfp_module_insert(struct sfp_bus *bu
  95         const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
  96         int ret = 0;
  97
  98 +       bus->sfp_quirk = sfp_lookup_quirk(id);
  99 +
 100         if (ops && ops->module_insert)
 101                 ret = ops->module_insert(bus->upstream, id);
 102
 103 @@ -623,6 +675,8 @@ void sfp_module_remove(struct sfp_bus *b
 104
 105         if (ops && ops->module_remove)
 106                 ops->module_remove(bus->upstream);
 107 +
 108 +       bus->sfp_quirk = NULL;
 109  }
 110  EXPORT_SYMBOL_GPL(sfp_module_remove);
 111