diff options
Diffstat (limited to 'drivers/net/wimax/i2400m/tx.c')
| -rw-r--r-- | drivers/net/wimax/i2400m/tx.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/net/wimax/i2400m/tx.c b/drivers/net/wimax/i2400m/tx.c index fab27e4a4cb3..8561c0766535 100644 --- a/drivers/net/wimax/i2400m/tx.c +++ b/drivers/net/wimax/i2400m/tx.c @@ -258,8 +258,10 @@ enum { * Doc says maximum transaction is 16KiB. If we had 16KiB en * route and 16KiB being queued, it boils down to needing * 32KiB. + * 32KiB is insufficient for 1400 MTU, hence increasing + * tx buffer size to 64KiB. */ - I2400M_TX_BUF_SIZE = 32768, + I2400M_TX_BUF_SIZE = 65536, /** * Message header and payload descriptors have to be 16 * aligned (16 + 4 * N = 16 * M). If we take that average sent @@ -274,6 +276,19 @@ enum { I2400M_TX_PLD_SIZE = sizeof(struct i2400m_msg_hdr) + I2400M_TX_PLD_MAX * sizeof(struct i2400m_pld), I2400M_TX_SKIP = 0x80000000, + /* + * 16 byte aligned MAX_MTU + 4 byte payload prefix. + */ + I2400M_MAX_MTU_ALIGN = 16, + I2400M_TX_PDU_SIZE = I2400M_MAX_MTU % I2400M_MAX_MTU_ALIGN + + I2400M_MAX_MTU + sizeof(struct i2400m_pl_data_hdr), + /* + * 256 byte aligned toal size of 12 PDUs including msg header, + */ + I2400M_TX_PDU_ALIGN = 256, + I2400M_TX_PDU_TOTAL_SIZE = ((I2400M_TX_PDU_SIZE * I2400M_TX_PLD_MAX + + sizeof(struct i2400m_msg_hdr))/I2400M_TX_PDU_ALIGN + 1) + * I2400M_TX_PDU_ALIGN * 2, }; #define TAIL_FULL ((void *)~(unsigned long)NULL) @@ -874,6 +889,8 @@ int i2400m_tx_setup(struct i2400m *i2400m) INIT_WORK(&i2400m->wake_tx_ws, i2400m_wake_tx_work); i2400m->tx_sequence = 0; + /* Warn if the calculated buffer size exceeds I2400M_TX_BUF_SIZE. */ + BUILD_BUG_ON(I2400M_TX_PDU_TOTAL_SIZE > I2400M_TX_BUF_SIZE); i2400m->tx_buf = kmalloc(I2400M_TX_BUF_SIZE, GFP_KERNEL); if (i2400m->tx_buf == NULL) result = -ENOMEM; |