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charset="us-ascii"; Format="flowed" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 8/10/23 02:23, Jesse Brandeburg wrote: > The driver is misconfiguring the hardware for some values of MTU such that > it could use multiple descriptors to receive a packet when it could have > simply used one. > > Change the driver to use a round-up instead of the result of a shift, as > the shift can truncate the lower bits of the size, and result in the > problem noted above. It also aligns this driver with similar code in i40e. > > The insidiousness of this problem is that everything works with the wrong > size, it's just not working as well as it could, as some MTU sizes end up > using two or more descriptors, and there is no way to tell that is > happening without looking at ice_trace or a bus analyzer. > > Signed-off-by: Jesse Brandeburg Nice catch! > --- > drivers/net/ethernet/intel/ice/ice_base.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c > index b678bdf96f3a..074bf9403cd1 100644 > --- a/drivers/net/ethernet/intel/ice/ice_base.c > +++ b/drivers/net/ethernet/intel/ice/ice_base.c > @@ -435,7 +435,8 @@ static int ice_setup_rx_ctx(struct ice_rx_ring *ring) > /* Receive Packet Data Buffer Size. > * The Packet Data Buffer Size is defined in 128 byte units. > */ > - rlan_ctx.dbuf = ring->rx_buf_len >> ICE_RLAN_CTX_DBUF_S; > + rlan_ctx.dbuf = DIV_ROUND_UP(ring->rx_buf_len, > + BIT_ULL(ICE_RLAN_CTX_DBUF_S)); looks like %ICE_RLAN_CTX_DBUF_S is only used once in whole codebase, here. Perhaps you could rename it (even considering that it is targeted for -net), and have it as ICE_RLAN_CTX_DBUF_DIV or similar? Then it will be BIT(7) or just 128. Also, I would keep it as 32bit value. > > /* use 32 byte descriptors */ > rlan_ctx.dsize = 1; (BTW: you have missed my review on e1000 ML) anyway, it's good Reviewed-by: Przemek Kitszel _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan