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path: root/drivers/net/mv643xx_eth.c
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2009-05-17mv643xx_eth: fix PPC DMA breakageGabriel Paubert
After 2.6.29, PPC no more admits passing NULL to the dev parameter of the DMA API. The result is a BUG followed by solid lock-up when the mv643xx_eth driver brings an interface up. The following patch makes the driver work on my Pegasos again; it is mostly a search and replace of NULL by mp->dev->dev.parent in dma allocation/freeing/mapping/unmapping functions. Signed-off-by: Gabriel Paubert <paubert@iram.es> Acked-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-29mv643xx_eth: 64bit mib counter read fixLennert Buytenhek
On several mv643xx_eth hardware versions, the two 64bit mib counters for 'good octets received' and 'good octets sent' are actually 32bit counters, and reading from the upper half of the register has the same effect as reading from the lower half of the register: an atomic read-and-clear of the entire 32bit counter value. This can under heavy traffic occasionally lead to small numbers being added to the upper half of the 64bit mib counter even though no 32bit wrap has occured. Since we poll the mib counters at least every 30 seconds anyway, we might as well just skip the reads of the upper halves of the hardware counters without breaking the stats, which this patch does. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Cc: stable@kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-29mv643xx_eth: OOM handling fixesLennert Buytenhek
Currently, when OOM occurs during rx ring refill, mv643xx_eth will get into an infinite loop, due to the refill function setting the OOM bit but not clearing the 'rx refill needed' bit for this queue, while the calling function (the NAPI poll handler) will call the refill function in a loop until the 'rx refill needed' bit goes off, without checking the OOM bit. This patch fixes this by checking the OOM bit in the NAPI poll handler before attempting to do rx refill. This means that once OOM occurs, we won't try to do any memory allocations again until the next invocation of the poll handler. While we're at it, change the OOM flag to be a single bit instead of one bit per receive queue since OOM is a system state rather than a per-queue state, and cancel the OOM timer on entry to the NAPI poll handler if it's running to prevent it from firing when we've already come out of OOM. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Cc: stable@kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-08mv643xx_eth: don't reset the rx coal timer on interface upLennert Buytenhek
Move SDMA configuration from interface up to port probe, to prevent overwriting the receive coalescing timer value on interface up. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-17Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/igb/igb_main.c drivers/net/qlge/qlge_main.c drivers/net/wireless/ath9k/ath9k.h drivers/net/wireless/ath9k/core.h drivers/net/wireless/ath9k/hw.c
2009-03-13mv643xx_eth: fix unicast address filter corruption on mtu changeLennert Buytenhek
When mv643xx_eth_open() is called to up an interface, port_start() will first re-program the unicast address filter, and then re-initialise the PORT_CONFIG register, but that will disable unicast promiscuous mode if it was enabled by the unicast address filter setup. This isn't a problem on ifconfig up, as ->set_rx_mode() will be called shortly afterwards which will program the filters again, but it does trigger when changing the MTU, which calls mv643xx_eth_stop() and then mv643xx_eth_open() by hand to repopulate the receive rings with skbuffs of the new size. Swap the initialisation of the PORT_START register and the call to the unicast filter setup function to fix this. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-24mv643xx_eth: set sane default receive coalescing timeoutLennert Buytenhek
A receive coalescing timeout of 250 usec appears to strike a good balance between allowing enough received frames to be aggregated for LRO to do its job and not allowing the connection to stall due to delaying ACKs to the remote end for too long. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-24mv643xx_eth: move a couple of init actions from ->open() to port probeLennert Buytenhek
Move the netif_carrier_off() call in ->open() to port probe, so that ethtool doesn't report the link as being up before we have up'd the interface. Move initialisation of the rx/tx coalescing timers from ->open() to port probe, so that we don't reset the coalescing timers every time the interface is up'd. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-24mv643xx_eth: convert to net_device_opsLennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-24mv643xx_eth: make LRO unconditionalLennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-24Merge branch 'master' of /home/davem/src/GIT/linux-2.6/David S. Miller
2009-02-18net/mv643xx: don't disable the mib timer too early and lock properlySebastian Siewior
mib_counters_update() also restarts the timer. So the timer is dequeued, the stats are read and then the timer is enqueued again. This is "okay" unless someone unloads the module. The locking here is also broken: mib_counters_update() grabs just a simple spinlock. The only thing the lock is good for is to protect the timer func against other callers namely mv643xx_eth_stop() && mv643xx_eth_get_ethtool_stats(). That means if the spinlock is taken via the ethtool path and than the timer kicks in then the box will lock up. Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Acked-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-18net/mv643xx: use GFP_ATOMIC while atomicSebastian Siewior
dev_set_rx_mode() grabs netif_addr_lock_bh(): |BUG: sleeping function called from invalid context at /home/bigeasy/git/cryptodev-2.6/mm/slub.c:1599 |in_atomic(): 1, irqs_disabled(): 0, pid: 859, name: ifconfig |2 locks held by ifconfig/859: | #0: (rtnl_mutex){--..}, at: [<c0239ccc>] rtnl_lock+0x18/0x20 | #1: (_xmit_ETHER){-...}, at: [<c022d094>] dev_set_rx_mode+0x1c/0x30 |[<c029f118>] (dump_stack+0x0/0x14) from [<c003df28>] (__might_sleep+0x11c/0x13c) |[<c003de0c>] (__might_sleep+0x0/0x13c) from [<c00a8854>] (kmem_cache_alloc+0x30/0xd4) | r5:c78093a0 r4:c034a47c |[<c00a8824>] (kmem_cache_alloc+0x0/0xd4) from [<c01a5fd0>] (mv643xx_eth_set_rx_mode+0x70/0x188) |[<c01a5f60>] (mv643xx_eth_set_rx_mode+0x0/0x188) from [<c022ced0>] (__dev_set_rx_mode+0x40/0xac) |[<c022ce90>] (__dev_set_rx_mode+0x0/0xac) from [<c022d09c>] (dev_set_rx_mode+0x24/0x30) | r6:00001043 r5:c78090f8 r4:c7809000 |[<c022d078>] (dev_set_rx_mode+0x0/0x30) from [<c02304c4>] (dev_open+0xe4/0x114) | r5:c7809350 r4:c7809000 |[<c02303e0>] (dev_open+0x0/0x114) from [<c022fd18>] (dev_change_flags+0xb0/0x190) | r5:00000041 r4:c7809000 |[<c022fc68>] (dev_change_flags+0x0/0x190) from [<c0270250>] (devinet_ioctl+0x2f0/0x710) | r7:c7221e70 r6:c7aadb00 r5:00000000 r4:00000001 |[<c026ff60>] (devinet_ioctl+0x0/0x710) from [<c02717c8>] (inet_ioctl+0xd4/0x110) |[<c02716f4>] (inet_ioctl+0x0/0x110) from [<c021fb74>] (sock_ioctl+0x1f4/0x254) | r4:c7242b40 |[<c021f980>] (sock_ioctl+0x0/0x254) from [<c00b8160>] (vfs_ioctl+0x38/0x98) | r6:beec9bb8 r5:00008914 r4:c7242b40 |[<c00b8128>] (vfs_ioctl+0x0/0x98) from [<c00b873c>] (do_vfs_ioctl+0x484/0x4d4) | r6:00008914 r5:c7242b40 r4:c74db1c0 |[<c00b82b8>] (do_vfs_ioctl+0x0/0x4d4) from [<c00b87cc>] (sys_ioctl+0x40/0x64) |[<c00b878c>] (sys_ioctl+0x0/0x64) from [<c00269a0>] (ret_fast_syscall+0x0/0x2c) |[42949399.520000] r7:00000036 r6:beec9c80 r5:00000041 r4:beec9bb8 Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Acked-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-15mv643xx_eth: implement Large Receive OffloadLennert Buytenhek
Controlled by a compile-time (Kconfig) option for now, since it isn't a win in all cases. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-15mv643xx_eth: allow enabling/disabling tx checksumming via ethtoolLennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-15mv643xx_eth: export rx csum get/set methods via ethtoolLennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-15mv643xx_eth: implement ethtool rx/tx ring size query and resizingLennert Buytenhek
Rename the mp->default_[rt]x_ring_size variables to ->[rt]x_ring_size, allow them to be read via the standard ethtool ->get_ringparam() op, and add a ->set_ringparam() op to allow resizing them at run time. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-15mv643xx_eth: rework interrupt coalescing, and export via ethtoolLennert Buytenhek
This patch: - increases the precision of the receive/transmit interrupt coalescing register value computations by using 64bit temporaries; - adds functions to read the current hardware coalescing register values and convert them back to usecs; - exports the {get,set} {rx,tx} coal methods via the standard ethtool coalescing interface. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-15mv643xx_eth: unify ethtool ops for phy'd and phy-less interfacesLennert Buytenhek
It's a waste having two different versions of this structure around when the differences between ethtool ops for phy'd and phy-less interfaces are so minor. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-26net: struct device - replace bus_id with dev_name(), dev_set_name()Kay Sievers
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-19mv643xx_eth: prevent interrupt storm on ifconfig downGabriel Paubert
Contrary to what the docs say, the 'extended interrupt cause' bit in the interrupt cause register (bit 1) appears to not be maskable on at least some of the mv643xx_eth platforms, making writing zeroes to the interrupt mask register but not the extended interrupt mask register insufficient to stop interrupts from occuring. Therefore, also write zeroes to the extended interrupt mask register when shutting down the port. This fixes the interrupt storm seen on the Pegasos board when shutting down the interface. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-19mv643xx_eth: fix multicast filter programmingLennert Buytenhek
Commit 66e63ffbc04706568d8789cbb00eaa8ddbcae648 ("mv643xx_eth: implement ->set_rx_mode()") cleaned up mv643xx_eth's multicast filter programming, but broke it as well. The non-special multicast filter table (for multicast addresses that are not of the form 01:00:5e:00:00:xx) consists of 256 hash table buckets organised as 64 32-bit words, where the 'accept' bits are in the LSB of each byte, so in bits 24 16 8 0 of each 32-bit word. The old code got this right, but the referenced commit broke this by using bits 3 2 1 0 instead. This commit fixes this up. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-19Revert "mv643xx_eth: use longer DMA bursts".Lennert Buytenhek
This reverts commit cd4ccf76bfd2c36d351e68be7e6a597268f98a1a. On the Pegasos board, we can't do DMA burst that are longer than one cache line. For now, go back to using 32 byte DMA bursts for all mv643xx_eth platforms -- we can switch the ARM-based platforms back to doing long 128 byte bursts in the next development cycle. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Reported-by: Alan Curry <pacman@kosh.dhis.org> Reported-by: Gabriel Paubert <paubert@iram.es> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/ixgbe/ixgbe_main.c include/net/mac80211.h net/phonet/af_phonet.c
2008-11-20mv643xx_eth: calculate descriptor pointer only once in rxq_refill()Lennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20mv643xx_eth: move receive error handling out of lineLennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20mv643xx_eth: implement ->set_rx_mode()Lennert Buytenhek
Currently, if multiple unicast addresses are programmed into a mv643xx_eth interface, the core networking will resort to enabling promiscuous mode on the interface, as mv643xx_eth does not implement ->set_rx_mode(). This patch switches mv643xx_eth over from ->set_multicast_list() to ->set_rx_mode(), and implements support for secondary unicast addresses. The hardware can handle multiple unicast addresses as long as their first 11 nibbles are the same (i.e. are of the form xx:xx:xx:xx:xx:xy where the x part is the same for all addresses), so if that is the case, we use that mode. If it's not the case, we enable unicast promiscuous mode in the hardware, which is slightly better than enabling promiscuous mode for multicasts as well, which is what would happen before. While we are at it, change the programming sequence so that we don't clear all filter bits first, so we don't lose all incoming packets while the filter is being reprogrammed. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20mv643xx_eth: inline txq_alloc_desc_index()Lennert Buytenhek
Since txq_alloc_desc_index() is a very simple function, and since descriptor ring index handling for transmit reclaim, receive processing and receive refill is already handled inline as well, inline txq_alloc_desc_index() into its two call sites. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20mv643xx_eth: introduce per-port register area pointerLennert Buytenhek
The mv643xx_eth driver uses the rdl()/wrl() macros to read and write hardware registers. Per-port registers are accessed in the following way: #define PORT_STATUS(p) (0x0444 + ((p) << 10)) [...] static inline u32 rdl(struct mv643xx_eth_private *mp, int offset) { return readl(mp->shared->base + offset); } [...] port_status = rdl(mp, PORT_STATUS(mp->port_num)); By giving the per-port 'struct mv643xx_eth_private' its own 'void __iomem *base' pointer that points to the per-port register area, we can get rid of both the double indirection and the << 10 that is done for every per-port register access -- this patch does that. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20mv643xx_eth: checkpatch fixesLennert Buytenhek
Fix up a couple of coding style issues caught by checkpatch. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20mv643xx_eth: fix recycle check boundLennert Buytenhek
When mv643xx_eth allocates skbuffs, it adds 'dma_get_cache_alignment() - 1' to the length it needs, so that it can align the skb's ->data pointer to a cache boundary. When checking whether a transmitted skbuff can be reused as a receive buffer, these bytes needs to be included into the minimum bound for the recycle check. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-20mv643xx_eth: fix the order of mdiobus_{unregister, free}() callsLennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-06Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/wireless/ath5k/base.c net/8021q/vlan_core.c
2008-11-03drivers/net: Kill now superfluous ->last_rx stores.David S. Miller
The generic packet receive code takes care of setting netdev->last_rx when necessary, for the sake of the bonding ARP monitor. Drivers need not do it any more. Some cases had to be skipped over because the drivers were making use of the ->last_rx value themselves. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-03mv643xx_eth: fix SMI bus access timeoutsLennert Buytenhek
The mv643xx_eth mii bus implementation uses wait_event_timeout() to wait for SMI completion interrupts. If wait_event_timeout() would return zero, mv643xx_eth would conclude that the SMI access timed out, but this is not necessarily true -- wait_event_timeout() can also return zero in the case where the SMI completion interrupt did happen in time but where it took longer than the requested timeout for the process performing the SMI access to be scheduled again. This would lead to occasional SMI access timeouts when the system would be under heavy load. The fix is to ignore the return value of wait_event_timeout(), and to re-check the SMI done bit after wait_event_timeout() returns to determine whether or not the SMI access timed out. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2008-10-27net: convert print_mac to %pMJohannes Berg
This converts pretty much everything to print_mac. There were a few things that had conflicts which I have just dropped for now, no harm done. I've built an allyesconfig with this and looked at the files that weren't built very carefully, but it's a huge patch. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-10-08mv643xx_eth: include linux/ip.h to fix buildLennert Buytenhek
mv643xx_eth uses ip_hdr() (defined in linux/ip.h), but relied on another header file to include the needed header file indirectly. In latest net-next this indirect include chain is gone, so the driver fails to build. Include linux/ip.h explicitly to fix this. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-10-08phylib: move to dynamic allocation of struct mii_busLennert Buytenhek
This patch introduces mdiobus_alloc() and mdiobus_free(), and makes all mdio bus drivers use these functions to allocate their struct mii_bus'es dynamically. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Andy Fleming <afleming@freescale.com>
2008-10-08phylib: rename mii_bus::dev to mii_bus::parentLennert Buytenhek
In preparation of giving mii_bus objects a device tree presence of their own, rename struct mii_bus's ->dev argument to ->parent, since having a 'struct device *dev' that points to our parent device conflicts with introducing a 'struct device dev' representing our own device. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Andy Fleming <afleming@freescale.com>
2008-10-01mv643xx_eth: hook up skb recyclingLennert Buytenhek
This gives a nice increase in the maximum loss-free packet forwarding rate in routing workloads. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-09-19mv643xx_eth: bump version to 1.4Lennert Buytenhek
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-19mv643xx_eth: convert to phylibLennert Buytenhek
Switch mv643xx_eth from using drivers/net/mii.c to using phylib. Since the mv643xx_eth hardware does all the link state handling and PHY polling, the driver will use phylib in the "Doing it all yourself" mode described in the phylib documentation. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Acked-by: Andy Fleming <afleming@freescale.com>
2008-09-19mv643xx_eth: enforce frequent hardware statistics pollingLennert Buytenhek
If we don't poll the hardware statistics counters at least once every ~34 seconds, overflow might occur without us noticing. So, set up a timer to poll the statistics counters at least once every 30 seconds. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-19mv643xx_eth: deal with unexpected ethernet header sizesLennert Buytenhek
When the IP header doesn't start 14, 18, 22 or 26 bytes into the packet (which are the only four cases that the hardware can deal with if asked to do IP checksumming on transmit), invoke the software checksum helper instead of letting the packet go out with a corrupt checksum inserted into the packet in the wrong place. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-19mv643xx_eth: fix receive checksummingLennert Buytenhek
We have to explicitly tell the hardware to include the pseudo-header when doing receive checksumming, otherwise hardware checksumming will fail for every received packet and we'll end up setting CHECKSUM_NONE on every received packet. While we're at it, when skb->ip_summed is set to CHECKSUM_UNNECESSARY on received packets, skb->csum is supposed to be undefined, and thus there is no need to set it. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-14mv643xx_eth: add support for chips without transmit bandwidth controlLennert Buytenhek
Add support for mv643xx_eth versions that have no transmit bandwidth control registers at all, such as the ethernet block found in the Marvell 88F6183 ARM SoC. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-14mv643xx_eth: avoid reading ->byte_cnt twice during receive processingLennert Buytenhek
Currently, the receive processing reads ->byte_cnt twice (once to update interface statistics and once to properly size the data area of the received skb), but since receive descriptors live in uncached memory, caching this value in a local variable saves one uncached access, and increases routing performance a tiny little bit more. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-14mv643xx_eth: shrink default receive and transmit queue sizesLennert Buytenhek
Since the size of the receive queue is directly related to the data cache footprint of the driver (between refilling a receive ring entry with a fresh skb and receiving a packet in that entry, queue_size - 1 other skbs will have been touched), shrink the default receive queue size to a saner number of entries, as 400 is definite overkill for almost all workloads. While we are at it, trim the default transmit queue size a bit as well. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-14mv643xx_eth: replace array of skbs awaiting transmit completion with a queueLennert Buytenhek
Get rid of the skb pointer array that we currently use for transmit reclaim, and replace it with an skb queue, to which skbuffs are appended when they are passed to the xmit function, and removed from the front and freed when we do transmit queue reclaim and hit a descriptor with the 'owned by device' bit clear and 'last descriptor' bit set. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-09-14mv643xx_eth: avoid dropping tx lock during transmit reclaimLennert Buytenhek
By moving DMA unmapping during transmit reclaim back under the netif tx lock, we avoid the situation where we read the DMA address and buffer length from the descriptor under the lock and then not do anything with that data after dropping the lock on platforms where the DMA unmapping routines are all NOPs (which is the case on all ARM platforms that mv643xx_eth is used on at least). This saves two uncached reads, which makes a small but measurable performance difference in routing benchmarks. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>