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mostly whitespace changes:

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- remove vestiges of the old memory allocator
- clean up some comments
This commit is contained in:
Luigi Rizzo 2013-04-19 21:08:21 +00:00
parent 21b6ee96fc
commit 2579e2d715
3 changed files with 34 additions and 47 deletions
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10
sys/dev/netmap/netmap.c
View File

@ -324,11 +324,7 @@ netmap_update_config(struct netmap_adapter *na)
}
/*------------- memory allocator -----------------*/
#ifdef NETMAP_MEM2
#include "netmap_mem2.c"
#else /* !NETMAP_MEM2 */
#include "netmap_mem1.c"
#endif /* !NETMAP_MEM2 */
/*------------ end of memory allocator ----------*/
@ -498,16 +494,16 @@ netmap_dtor(void *data)
{
struct netmap_priv_d *priv = data;
struct ifnet *ifp = priv->np_ifp;
struct netmap_adapter *na;
NMA_LOCK();
if (ifp) {
na = NA(ifp);
struct netmap_adapter *na = NA(ifp);
na->nm_lock(ifp, NETMAP_REG_LOCK, 0);
netmap_dtor_locked(data);
na->nm_lock(ifp, NETMAP_REG_UNLOCK, 0);
nm_if_rele(ifp);
nm_if_rele(ifp); /* might also destroy *na */
}
if (priv->ref_done) {
netmap_memory_deref();

16
sys/dev/netmap/netmap_kern.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2011-2012 Matteo Landi, Luigi Rizzo. All rights reserved.
* Copyright (C) 2011-2013 Matteo Landi, Luigi Rizzo. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -34,8 +34,6 @@
#ifndef _NET_NETMAP_KERN_H_
#define _NET_NETMAP_KERN_H_
#define NETMAP_MEM2 // use the new memory allocator
#if defined(__FreeBSD__)
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
@ -45,7 +43,7 @@
#define MBUF_LEN(m) ((m)->m_pkthdr.len)
#define NM_SEND_UP(ifp, m) ((ifp)->if_input)(ifp, m)
#elif defined (linux)
#define NM_LOCK_T spinlock_t
#define NM_LOCK_T safe_spinlock_t // see bsd_glue.h
#define NM_SELINFO_T wait_queue_head_t
#define MBUF_LEN(m) ((m)->len)
#define NM_SEND_UP(ifp, m) netif_rx(m)
@ -431,7 +429,6 @@ netmap_idx_k2n(struct netmap_kring *kr, int idx)
}
#ifdef NETMAP_MEM2
/* Entries of the look-up table. */
struct lut_entry {
void *vaddr; /* virtual address. */
@ -442,9 +439,6 @@ struct netmap_obj_pool;
extern struct lut_entry *netmap_buffer_lut;
#define NMB_VA(i) (netmap_buffer_lut[i].vaddr)
#define NMB_PA(i) (netmap_buffer_lut[i].paddr)
#else /* NETMAP_MEM1 */
#define NMB_VA(i) (netmap_buffer_base + (i * NETMAP_BUF_SIZE) )
#endif /* NETMAP_MEM2 */
/*
* NMB return the virtual address of a buffer (buffer 0 on bad index)
@ -462,11 +456,8 @@ PNMB(struct netmap_slot *slot, uint64_t *pp)
{
uint32_t i = slot->buf_idx;
void *ret = (i >= netmap_total_buffers) ? NMB_VA(0) : NMB_VA(i);
#ifdef NETMAP_MEM2
*pp = (i >= netmap_total_buffers) ? NMB_PA(0) : NMB_PA(i);
#else
*pp = vtophys(ret);
#endif
return ret;
}
@ -474,5 +465,6 @@ PNMB(struct netmap_slot *slot, uint64_t *pp)
int netmap_rx_irq(struct ifnet *, int, int *);
#define netmap_tx_irq(_n, _q) netmap_rx_irq(_n, _q, NULL)
extern int netmap_copy;
#endif /* _NET_NETMAP_KERN_H_ */

49
sys/dev/netmap/netmap_mem2.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2012 Matteo Landi, Luigi Rizzo, Giuseppe Lettieri. All rights reserved.
* Copyright (C) 2012-2013 Matteo Landi, Luigi Rizzo, Giuseppe Lettieri. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -31,16 +31,18 @@
*/
/*
* This allocator creates three memory regions:
* This allocator creates three memory pools:
* nm_if_pool for the struct netmap_if
* nm_ring_pool for the struct netmap_ring
* nm_buf_pool for the packet buffers.
*
* All regions need to be multiple of a page size as we export them to
* userspace through mmap. Only the latter needs to be dma-able,
* that contain netmap objects. Each pool is made of a number of clusters,
* multiple of a page size, each containing an integer number of objects.
* The clusters are contiguous in user space but not in the kernel.
* Only nm_buf_pool needs to be dma-able,
* but for convenience use the same type of allocator for all.
*
* Once mapped, the three regions are exported to userspace
* Once mapped, the three pools are exported to userspace
* as a contiguous block, starting from nm_if_pool. Each
* cluster (and pool) is an integral number of pages.
* [ . . . ][ . . . . . .][ . . . . . . . . . .]
@ -56,7 +58,7 @@
* The pool is split into smaller clusters, whose size is a
* multiple of the page size. The cluster size is chosen
* to minimize the waste for a given max cluster size
* (we do it by brute force, as we have relatively few object
* (we do it by brute force, as we have relatively few objects
* per cluster).
*
* Objects are aligned to the cache line (64 bytes) rounding up object
@ -80,7 +82,7 @@
* In the worst case we have one netmap_if per ring in the system.
*
* struct netmap_ring
* variable too, 8 byte per slot plus some fixed amount.
* variable size, 8 byte per slot plus some fixed amount.
* Rings can be large (e.g. 4k slots, or >32Kbytes).
* We default to 36 KB (9 pages), and a few hundred rings.
*
@ -93,11 +95,7 @@
* the size to multiple of 1K or so. Default to 2K
*/
#ifndef CONSERVATIVE
#define NETMAP_BUF_MAX_NUM 20*4096*2 /* large machine */
#else /* CONSERVATIVE */
#define NETMAP_BUF_MAX_NUM 20000 /* 40MB */
#endif
#ifdef linux
#define NMA_LOCK_T struct semaphore
@ -178,7 +176,11 @@ struct netmap_mem_d {
struct netmap_obj_pool pools[NETMAP_POOLS_NR];
};
/*
* nm_mem is the memory allocator used for all physical interfaces
* running in netmap mode.
* Virtual (VALE) ports will have each its own allocator.
*/
static struct netmap_mem_d nm_mem = { /* Our memory allocator. */
.pools = {
[NETMAP_IF_POOL] = {
@ -205,6 +207,7 @@ static struct netmap_mem_d nm_mem = { /* Our memory allocator. */
},
};
// XXX logically belongs to nm_mem
struct lut_entry *netmap_buffer_lut; /* exported */
/* memory allocator related sysctls */
@ -212,12 +215,10 @@ struct lut_entry *netmap_buffer_lut; /* exported */
#define STRINGIFY(x) #x
#define DECLARE_SYSCTLS(id, name) \
/* TUNABLE_INT("hw.netmap." STRINGIFY(name) "_size", &netmap_params[id].size); */ \
SYSCTL_INT(_dev_netmap, OID_AUTO, name##_size, \
CTLFLAG_RW, &netmap_params[id].size, 0, "Requested size of netmap " STRINGIFY(name) "s"); \
SYSCTL_INT(_dev_netmap, OID_AUTO, name##_curr_size, \
CTLFLAG_RD, &nm_mem.pools[id]._objsize, 0, "Current size of netmap " STRINGIFY(name) "s"); \
/* TUNABLE_INT("hw.netmap." STRINGIFY(name) "_num", &netmap_params[id].num); */ \
SYSCTL_INT(_dev_netmap, OID_AUTO, name##_num, \
CTLFLAG_RW, &netmap_params[id].num, 0, "Requested number of netmap " STRINGIFY(name) "s"); \
SYSCTL_INT(_dev_netmap, OID_AUTO, name##_curr_num, \
@ -228,14 +229,12 @@ DECLARE_SYSCTLS(NETMAP_RING_POOL, ring);
DECLARE_SYSCTLS(NETMAP_BUF_POOL, buf);
/*
* Convert a userspace offset to a phisical address.
* XXX re-do in a simpler way.
* Convert a userspace offset to a physical address.
* XXX only called in the FreeBSD's netmap_mmap()
* because in linux we map everything at once.
*
* The idea here is to hide userspace applications the fact that pre-allocated
* memory is not contiguous, but fragmented across different clusters and
* smaller memory allocators. Consequently, first of all we need to find which
* allocator is owning provided offset, then we need to find out the physical
* address associated to target page (this is done using the look-up table.
* First, find the allocator that contains the requested offset,
* then locate the cluster through a lookup table.
*/
static inline vm_paddr_t
netmap_ofstophys(vm_offset_t offset)
@ -247,7 +246,7 @@ netmap_ofstophys(vm_offset_t offset)
for (i = 0; i < NETMAP_POOLS_NR; offset -= p[i]._memtotal, i++) {
if (offset >= p[i]._memtotal)
continue;
// XXX now scan the clusters
// now lookup the cluster's address
return p[i].lut[offset / p[i]._objsize].paddr +
offset % p[i]._objsize;
}
@ -356,7 +355,8 @@ netmap_obj_malloc(struct netmap_obj_pool *p, int len, uint32_t *start, uint32_t
/*
* free by index, not by address
* free by index, not by address. This is slow, but is only used
* for a small number of objects (rings, nifp)
*/
static void
netmap_obj_free(struct netmap_obj_pool *p, uint32_t j)
@ -428,7 +428,7 @@ netmap_new_bufs(struct netmap_if *nifp,
* in the NIC ring. This is a hack that hides missing
* initializations in the drivers, and should go away.
*/
slot[i].flags = NS_BUF_CHANGED;
// slot[i].flags = NS_BUF_CHANGED;
}
ND("allocated %d buffers, %d available, first at %d", n, p->objfree, pos);
@ -683,7 +683,6 @@ netmap_memory_config(void)
{
int i;
if (!netmap_memory_config_changed())
goto out;