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authorchas williams - CONTRACTOR <chas@cmf.nrl.navy.mil>2010-05-29 13:05:33 +0400
committerDavid S. Miller <davem@davemloft.net>2010-05-31 11:27:47 +0400
commite623d62512dcb68a1c4844f4d7b5c8f3aff7d0da (patch)
tree24d697011fcf477eb1781fc89f8e63c5edc735ec /drivers/atm/he.h
parent1d927870e583d19afa17b2062b65e8f74a83b742 (diff)
downloadlinux-e623d62512dcb68a1c4844f4d7b5c8f3aff7d0da.tar.xz
atm: [he] rewrite buffer handling in receive path
Instead of a fixed list of buffers, use the buffer pool correctly and keep track of the outstanding buffer indexes using a fixed table. Resolves reported HBUF_ERR's -- failures due to lack of receive buffers. Signed-off-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/atm/he.h')
-rw-r--r--drivers/atm/he.h48
1 files changed, 25 insertions, 23 deletions
diff --git a/drivers/atm/he.h b/drivers/atm/he.h
index 8bf3264e5d00..110a27d2ecfc 100644
--- a/drivers/atm/he.h
+++ b/drivers/atm/he.h
@@ -198,26 +198,33 @@ struct he_hsp {
} group[HE_NUM_GROUPS];
};
-/* figure 2.9 receive buffer pools */
+/*
+ * figure 2.9 receive buffer pools
+ *
+ * since a virtual address might be more than 32 bits, we store an index
+ * in the virt member of he_rbp. NOTE: the lower six bits in the rbrq
+ * addr member are used for buffer status further limiting us to 26 bits.
+ */
struct he_rbp {
volatile u32 phys;
- volatile u32 status;
+ volatile u32 idx; /* virt */
};
-/* NOTE: it is suggested that virt be the virtual address of the host
- buffer. on a 64-bit machine, this would not work. Instead, we
- store the real virtual address in another list, and store an index
- (and buffer status) in the virt member.
-*/
+#define RBP_IDX_OFFSET 6
+
+/*
+ * the he dma engine will try to hold an extra 16 buffers in its local
+ * caches. and add a couple buffers for safety.
+ */
-#define RBP_INDEX_OFF 6
-#define RBP_INDEX(x) (((long)(x) >> RBP_INDEX_OFF) & 0xffff)
-#define RBP_LOANED 0x80000000
-#define RBP_SMALLBUF 0x40000000
+#define RBPL_TABLE_SIZE (CONFIG_RBPL_SIZE + 16 + 2)
-struct he_virt {
- void *virt;
+struct he_buff {
+ struct list_head entry;
+ dma_addr_t mapping;
+ unsigned long len;
+ u8 data[];
};
#ifdef notyet
@@ -286,10 +293,13 @@ struct he_dev {
struct he_rbrq *rbrq_base, *rbrq_head;
int rbrq_peak;
+ struct he_buff **rbpl_virt;
+ unsigned long *rbpl_table;
+ unsigned long rbpl_hint;
struct pci_pool *rbpl_pool;
dma_addr_t rbpl_phys;
struct he_rbp *rbpl_base, *rbpl_tail;
- struct he_virt *rbpl_virt;
+ struct list_head rbpl_outstanding;
int rbpl_peak;
dma_addr_t tbrq_phys;
@@ -304,20 +314,12 @@ struct he_dev {
struct he_dev *next;
};
-struct he_iovec
-{
- u32 iov_base;
- u32 iov_len;
-};
-
#define HE_MAXIOV 20
struct he_vcc
{
- struct he_iovec iov_head[HE_MAXIOV];
- struct he_iovec *iov_tail;
+ struct list_head buffers;
int pdu_len;
-
int rc_index;
wait_queue_head_t rx_waitq;