-----Original Message-----

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+		 * Similar behavior to rte_bpf_eth callback.
+		 * if BPF program returns zero value for a given packet,
+		 * then it will be ignored.
+		 */

Looks like wrong callback name referred in the comment, should be

corrected?

It really is pcap_offline_filter() and Linux kernel socket filter.

Oh ok, rcs[i] is basically "return value of the filter program. This will be zero if the packet doesn't match the filter and non-zero if the packet matches the filter." 
got it now on why is the below if check.

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+		if (cbs->filter && rcs[i] == 0) {