On Fri, Jul 31, 2020 at 6:22 PM Vadym Kochan <vadym.koc...@plvision.eu> wrote:
> On Mon, Jul 27, 2020 at 03:59:13PM +0300, Andy Shevchenko wrote:
> > On Mon, Jul 27, 2020 at 3:23 PM Vadym Kochan <vadym.koc...@plvision.eu>
> > wrote:
...
> > > Signed-off-by: Andrii Savka <andrii.sa...@plvision.eu>
> > > Signed-off-by: Oleksandr Mazur <oleksandr.ma...@plvision.eu>
> > > Signed-off-by: Serhiy Boiko <serhiy.bo...@plvision.eu>
> > > Signed-off-by: Serhiy Pshyk <serhiy.ps...@plvision.eu>
> > > Signed-off-by: Taras Chornyi <taras.chor...@plvision.eu>
> > > Signed-off-by: Volodymyr Mytnyk <volodymyr.myt...@plvision.eu>
> > > Signed-off-by: Vadym Kochan <vadym.koc...@plvision.eu>
> >
> > This needs more work. You have to really understand the role of each
> > person in the above list.
> > I highly recommend (re-)read sections 11-13 of Submitting Patches.
> >
> At least looks like I need to add these persons as Co-author's.
I don't know, you are!
And I think you meant Co-developer's
...
> > > +#include <linux/string.h>
> > > +#include <linux/bitops.h>
> > > +#include <linux/bitfield.h>
> > > +#include <linux/errno.h>
> >
> > Perhaps ordered?
> >
> alphabetical ?
Yes.
...
> > > + struct prestera_msg_event_port *hw_evt;
> > > +
> > > + hw_evt = (struct prestera_msg_event_port *)msg;
> >
> > Can be one line I suppose.
> >
> Yes, but I am trying to avoid line-breaking because of 80 chars
> limitation.
We have 100, but okay.
...
> > > + if (evt->id == PRESTERA_PORT_EVENT_STATE_CHANGED)
> > > + evt->port_evt.data.oper_state = hw_evt->param.oper_state;
> > > + else
> > > + return -EINVAL;
> > > +
> > > + return 0;
> >
> > Perhaps traditional pattern, i.e.
> >
> > if (...)
> > return -EINVAL;
> > ...
> > return 0;
> >
> I am not sure if it is applicable here, because the error state here
> is if 'evt->id' did not matched after all checks. Actually this is
> simply a 'switch', but I use 'if' to have shorter code.
Then do it a switch-case. I can see that other reviewers/contributors
may stumble over this.
...
> > > + /* Only 0xFF mac addrs are supported */
> > > + if (port->fp_id >= 0xFF)
> > > + goto err_port_init;
> >
> > You meant 255, right?
> > Otherwise you have to mentioned is it byte limitation or what?
> >
> > ...
> Yes, 255 is a limitation because of max byte value.
But 255 itself is some kind of error value? Perhaps it deserves a definition.
...
> > > + np = of_find_compatible_node(NULL, NULL, "marvell,prestera");
> > > + if (np) {
> > > + base_mac_np = of_parse_phandle(np, "base-mac-provider",
> > > 0);
> > > + if (base_mac_np) {
> > > + const char *base_mac;
> > > +
> > > + base_mac = of_get_mac_address(base_mac_np);
> > > + of_node_put(base_mac_np);
> > > + if (!IS_ERR(base_mac))
> > > + ether_addr_copy(sw->base_mac, base_mac);
> > > + }
> > > + }
> > > +
> > > + if (!is_valid_ether_addr(sw->base_mac)) {
> > > + eth_random_addr(sw->base_mac);
> > > + dev_info(sw->dev->dev, "using random base mac address\n");
> > > + }
> >
> > Isn't it device_get_mac_address() reimplementation?
> >
> device_get_mac_address() just tries to get mac via fwnode.
Yes, and how is it different from here? (consider
fwnode_get_mac_address() if it suits better).
...
> > > + new_skb = alloc_skb(len, GFP_ATOMIC | GFP_DMA);
> >
> > Atomic? Why?
> >
> TX path might be called from net_tx_action which is softirq.
Okay, but GFP_DMA is quite a limitation to the memory region. Can't be 32-bit?
...
> > > + int tx_retry_num = 10 * tx_ring->max_burst;
> >
> > Magic!
> You mean the code is magic ? Yes, I am trying to relax the
> calling of SDMA engine.
Usually when reviewers tell you about magic it assumes magic numbers
whose meaning is not clear.
(Requires either to be defined or commented)
--
With Best Regards,
Andy Shevchenko
