Question about tg3 and bnx2 driver suppliers

I'm trying to fix a problem with packet drops and frame errors (really rxbds_empty and rx_discards (or rx_fw_discards depending on whether or not its a tg3 supported chip or a bnx2 chip)). We have this happening on pretty much all the RedHat 5.x systems we're running these drivers on. In investigating what remedies to employ to fix this, I'm trying to determine if new versions of this driver are supplied by Broadcom, or by people within the Linux community so 
I can find the right place to ask questions about it. I'm pretty sure this isn't the right list for these types of questions, but if someone could tell me whether I should be contacting Broadcom directly, or the name of some other Linux mailing list or forum that might help, I'd appreciate it.