3942 inject sanity into ipadm tcp buffer size properties
3943 _snd_lowat_fraction tcp tunable has no effect
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Peng Dai <peng.dai@delphix.com>

*** 19,47 ****
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   */
  /* Copyright (c) 1990 Mentat Inc. */
  
  #include <inet/ip.h>
  #include <inet/ip6.h>
  #include <inet/udp_impl.h>
  #include <sys/sunddi.h>
  
  /*
   * Special checkers for smallest/largest anonymous port so they don't
   * ever happen to be (largest < smallest).
   */
  /* ARGSUSED */
  static int
! udp_smallest_anon_set(void *cbarg, cred_t *cr, mod_prop_info_t *pinfo,
      const char *ifname, const void *pval, uint_t flags)
  {
          unsigned long new_value;
!         udp_stack_t *us = (udp_stack_t *)cbarg;
          int err;
  
          if ((err = mod_uint32_value(pval, pinfo, flags, &new_value)) != 0)
                  return (err);
          /* mod_uint32_value() + pinfo guarantees we're in UDP port range. */
--- 19,64 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+  * Copyright (c) 2013 by Delphix. All rights reserved.
   */
  /* Copyright (c) 1990 Mentat Inc. */
  
  #include <inet/ip.h>
  #include <inet/ip6.h>
  #include <inet/udp_impl.h>
  #include <sys/sunddi.h>
  
+ static int
+ udp_set_buf_prop(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
+     const char *ifname, const void *pval, uint_t flags)
+ {
+         return (mod_set_buf_prop(stack->netstack_udp->us_propinfo_tbl, stack,
+             cr, pinfo, ifname, pval, flags));
+ }
+ 
+ static int
+ udp_get_buf_prop(netstack_t *stack, mod_prop_info_t *pinfo, const char *ifname,
+     void *val, uint_t psize, uint_t flags)
+ {
+         return (mod_get_buf_prop(stack->netstack_udp->us_propinfo_tbl, stack,
+             pinfo, ifname, val, psize, flags));
+ }
+ 
  /*
   * Special checkers for smallest/largest anonymous port so they don't
   * ever happen to be (largest < smallest).
   */
  /* ARGSUSED */
  static int
! udp_smallest_anon_set(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
      const char *ifname, const void *pval, uint_t flags)
  {
          unsigned long new_value;
!         udp_stack_t *us = stack->netstack_udp;
          int err;
  
          if ((err = mod_uint32_value(pval, pinfo, flags, &new_value)) != 0)
                  return (err);
          /* mod_uint32_value() + pinfo guarantees we're in UDP port range. */
*** 51,65 ****
          return (0);
  }
  
  /* ARGSUSED */
  static int
! udp_largest_anon_set(void *cbarg, cred_t *cr, mod_prop_info_t *pinfo,
      const char *ifname, const void *pval, uint_t flags)
  {
          unsigned long new_value;
!         udp_stack_t *us = (udp_stack_t *)cbarg;
          int err;
  
          if ((err = mod_uint32_value(pval, pinfo, flags, &new_value)) != 0)
                  return (err);
          /* mod_uint32_value() + pinfo guarantees we're in UDP port range. */
--- 68,82 ----
          return (0);
  }
  
  /* ARGSUSED */
  static int
! udp_largest_anon_set(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
      const char *ifname, const void *pval, uint_t flags)
  {
          unsigned long new_value;
!         udp_stack_t *us = stack->netstack_udp;
          int err;
  
          if ((err = mod_uint32_value(pval, pinfo, flags, &new_value)) != 0)
                  return (err);
          /* mod_uint32_value() + pinfo guarantees we're in UDP port range. */
*** 103,131 ****
  
          { "largest_anon_port", MOD_PROTO_UDP,
              udp_largest_anon_set, mod_get_uint32,
              {1024, ULP_MAX_PORT, ULP_MAX_PORT}, {ULP_MAX_PORT} },
  
!         { "send_maxbuf", MOD_PROTO_UDP,
!             mod_set_uint32, mod_get_uint32,
!             {UDP_XMIT_LOWATER, (1<<30), UDP_XMIT_HIWATER},
              {UDP_XMIT_HIWATER} },
  
          { "_xmit_lowat", MOD_PROTO_UDP,
              mod_set_uint32, mod_get_uint32,
!             {0, (1<<30), UDP_XMIT_LOWATER},
              {UDP_XMIT_LOWATER} },
  
!         { "recv_maxbuf", MOD_PROTO_UDP,
!             mod_set_uint32, mod_get_uint32,
!             {UDP_RECV_LOWATER, (1<<30), UDP_RECV_HIWATER},
              {UDP_RECV_HIWATER} },
  
          /* tunable - 10 */
!         { "_max_buf", MOD_PROTO_UDP,
              mod_set_uint32, mod_get_uint32,
!             {65536, (1<<30), 2*1024*1024}, {2*1024*1024} },
  
          { "_pmtu_discovery", MOD_PROTO_UDP,
              mod_set_boolean, mod_get_boolean,
              {B_FALSE}, {B_FALSE} },
  
--- 120,148 ----
  
          { "largest_anon_port", MOD_PROTO_UDP,
              udp_largest_anon_set, mod_get_uint32,
              {1024, ULP_MAX_PORT, ULP_MAX_PORT}, {ULP_MAX_PORT} },
  
!         { "send_buf", MOD_PROTO_UDP,
!             udp_set_buf_prop, udp_get_buf_prop,
!             {UDP_XMIT_LOWATER, ULP_MAX_BUF, UDP_XMIT_HIWATER},
              {UDP_XMIT_HIWATER} },
  
          { "_xmit_lowat", MOD_PROTO_UDP,
              mod_set_uint32, mod_get_uint32,
!             {0, ULP_MAX_BUF, UDP_XMIT_LOWATER},
              {UDP_XMIT_LOWATER} },
  
!         { "recv_buf", MOD_PROTO_UDP,
!             udp_set_buf_prop, udp_get_buf_prop,
!             {UDP_RECV_LOWATER, ULP_MAX_BUF, UDP_RECV_HIWATER},
              {UDP_RECV_HIWATER} },
  
          /* tunable - 10 */
!         { "max_buf", MOD_PROTO_UDP,
              mod_set_uint32, mod_get_uint32,
!             {65536, ULP_MAX_BUF, 2*1024*1024}, {2*1024*1024} },
  
          { "_pmtu_discovery", MOD_PROTO_UDP,
              mod_set_boolean, mod_get_boolean,
              {B_FALSE}, {B_FALSE} },